Start-up and shutdown of the horizontal tube primary cooler
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When starting up or shutting down a horizontal tube type primary cooler, it is necessary to check whether all equipment, pipelines, valves, and instruments meet the requirements for operation. 2 After cleaning the upper and lower drain pipes as well as the condensate spray pipes with steam, close the valves of the upper and lower drain pipes. 3 Check whether the upper and lower condensate water seal tanks are filled with liquid. 4. Open the vent pipe at the top of the primary cooler, and use steam or nitrogen to clean it. Once a large amount of steam is coming out of the vent pipe, close the valves for the steam or nitrogen as well as the vent pipe valve, and at the same time open the valve for the gas supply. 5 Report to the shift supervisor, contact the blower, and then slowly open the gas outlet valve. 6. Sequentially open the inlet and outlet valves for waste heat, circulation, and low-temperature water. 7. Notify the control room and blowers to pay attention to changes in suction pressure in front of the machine, and adjust the valves for waste heat, circulation, and low-temperature water to ensure that the temperature of the exhaust gas meets the process requirements. Open the valves of the upper and lower condensate drainage pipes, as well as the valves of the respective spray pipes for the upper and lower condensates. 8. When the liquid levels in the upper and lower condensate tanks reach 2/3, start the condensate spray pumps for the upper and lower sections respectively, and adjust the flow rates of these pumps to meet the technical specifications. 9. Open the tar ratio control valves leading to the upper and lower condensate tanks, as well as the renewal valves for those tanks and the valves leading to the main tar-ammonia pipeline, in order to maintain a stable liquid level in the upper and lower condensate tanks. During shutdown 1, close the gas inlet and outlet valves of the horizontal tube type primary cooler. 2. Close the tar ratio valves for the upper and lower sections, as well as the condensate valves on the main pipes for removing tar and ammonia water; stop the spraying of condensate in the upper and lower sections, drain the liquid from the pipes, and clean them with steam. 3. Sequentially close the inlet and outlet valves for each section of the waste heat, circulation, and low-temperature water systems. 4. Drain water accumulated in the drainage equipment and pipelines. 5. Open the valve of the top vent pipe and use steam for cleaning; once a large amount of steam is coming out of the vent pipe, turn off the cleaning steam, replace it with nitrogen, maintain a positive pressure in the primary cooler, and then close the vent pipe valve. 6 If the initial cooler is not in use for an extended period, blind flanges should be installed at the gas inlet and outlet. Nitrogen is filled into the primary cooler for protection, maintaining a slight positive pressure inside it. Thermal cleaning of the primary cooler using steam: 1. Shut down the primary cooler according to steps 1–4 for shutdown. 2. Open the vent pipe valve and the steam cleaning valve, and use steam for cleaning. Once a large amount of steam begins to emerge from the vent pipe, close the steam cleaning valve. 3. Open the condensate vent valve, drain the condensate in the pre-cooler, and then close the vent valve. 4. Close the vent pipe valve after the initial cooler has cooled to room temperature. Hot ammonia water cleaning: 1. Stop the primary cooler according to steps 1–4 for shutdown. 2. Open the valve for spraying hot ammonia water and spray hot ammonia water into the primary cooler (the cleaning time depends on the degree of blockage in the primary cooler); also open the valve for draining the condensate from the upper section. 3. During cleaning, pay attention to changes in the liquid level in the condensate tank to prevent overflow. 4. After cleaning, close the spray valve and the condensate drain valve. At the start of operation, check whether all equipment, pipelines, valves, and instruments meet the requirements for starting up. 2 After cleaning the upper and lower drain pipes as well as the condensate spray pipes with steam, close the valves of the upper and lower drain pipes. 3 Check whether the upper and lower condensate water seal tanks are filled with liquid. 4. Open the vent pipe at the top of the primary cooler, and use steam or nitrogen to clean it. Once a large amount of steam is coming out of the vent pipe, close the valves for the steam or nitrogen as well as the vent pipe valve, and at the same time open the valve for the gas supply. 5 Report to the shift supervisor, contact the blower, and then slowly open the gas outlet valve. 6. Sequentially open the inlet and outlet valves for waste heat, circulation, and low-temperature water. 7. Notify the control room and blowers to pay attention to changes in suction pressure in front of the machine, and adjust the valves for waste heat, circulation, and low-temperature water to ensure that the temperature of the exhaust gas meets the process requirements. Open the valves of the upper and lower condensate drainage pipes, as well as the valves of the respective spray pipes for the upper and lower condensates. 8. When the liquid levels in the upper and lower condensate tanks reach 2/3, start the condensate spray pumps for the upper and lower sections respectively, and adjust the flow rates of these pumps to meet the technical specifications. 9. Open the tar ratio control valves leading to the upper and lower condensate tanks, as well as the renewal valves for those tanks and the valves leading to the main tar-ammonia pipeline, in order to maintain a stable liquid level in the upper and lower condensate tanks. During shutdown 1, close the gas inlet and outlet valves of the horizontal tube type primary cooler. 2. Close the tar ratio valves for the upper and lower sections, as well as the condensate valves on the main pipes for removing tar and ammonia water; stop the spraying of condensate in the upper and lower sections, drain the liquid from the pipes, and clean them with steam. 3. Sequentially close the inlet and outlet valves for each section of the waste heat, circulation, and low-temperature water systems. 4. Drain water accumulated in the drainage equipment and pipelines. 5. Open the valve of the top vent pipe and use steam for cleaning; once a large amount of steam is coming out of the vent pipe, turn off the cleaning steam, replace it with nitrogen, maintain a positive pressure in the primary cooler, and then close the vent pipe valve. 6 If the initial cooler is not in use for an extended period, blind flanges should be installed at the gas inlet and outlet. Nitrogen is filled into the primary cooler for protection, maintaining a slight positive pressure inside it. Thermal cleaning of the primary cooler using steam: 1. Shut down the primary cooler according to steps 1–4 for shutdown. 2. Open the vent pipe valve and the steam cleaning valve, and use steam for cleaning. Once a large amount of steam begins to emerge from the vent pipe, close the steam cleaning valve. 3. Open the condensate vent valve, drain the condensate in the pre-cooler, and then close the vent valve. 4. Close the vent pipe valve after the initial cooler has cooled to room temperature. Hot ammonia water cleaning: 1. Stop the primary cooler according to steps 1–4 for shutdown. 2. Open the valve for spraying hot ammonia water and spray hot ammonia water into the primary cooler (the cleaning time depends on the degree of blockage in the primary cooler); also open the valve for draining the condensate from the upper section. 3. During cleaning, pay attention to changes in the liquid level in the condensate tank to prevent overflow. 4. After cleaning, close the spray valve and the condensate drain valve.
Commissioning of the electrostatic tar collector: First, check the insulation performance of the electrical system to ensure it meets technical specifications, and verify that all valves are in the closed position. 2 Fill the liquid seal tank with water. 3 Confirm that the drain pipe of the electrostatic tar catcher is unobstructed. 4. Open the valve of the top vent pipe and introduce steam into the electrostatic tar catcher for cleaning. Once a large amount of steam is emitted from the vent pipe, close the steam valve (after 10–15 minutes of cleaning) as well as the vent pipe valve. 5-way gas inlet valve (fast inlet, slow outlet). 6. Open the gas outlet valve, slowly close the gas supply pipe valve, and pay attention to changes in the blower’s suction and pressure. If anything abnormal occurs, open the supply pipe valve and determine the cause. 7 Turn on the heater of the insulation box and adjust its temperature to meet the technical specifications. 8 Ensure that the oxygen content in the gas is no more than 1.0% (by volume). 9 Only after the temperature of the insulated box meets the technical specifications can the electrician be notified to supply power. 10 The electrician supplies power to the electrostatic tar catcher and adjusts the secondary current and secondary voltage to normal levels. 11 Open the valve of the electrostatic precipitator drain pipe. In the event of a shutdown of the electrostatic tar catcher, notify the electrician to arrive, cut off the high-voltage power supply, and ground both the output terminals of the silicon rectifier and the electrostatic corona plates. 2 Stop feeding hot nitrogen into the insulated box. 3. Close the gas inlet and outlet valves; when both electrostatic precipitators are shut down, it is necessary to open the gas bypass valve first. 4. Open the valve of the top vent pipe and use steam for cleaning; once a large amount of steam is coming out of the vent pipe, close the steam cleaning valve. After all the liquid has been drained, close the valve of the drain pipe. 5 Open the nitrogen purge valve, replace the air with nitrogen, and then close the nitrogen purge valve as well as the vent valve. 6 Cut off the power to the electric heater to stop heating ； If parked for an extended period, it should be protected with nitrogen. 7 If maintenance is required, plug the gas inlets and outlets, as well as the nitrogen, steam cleaning pipes and drain pipes with blind flanges, and replace the air before entering. Cleaning of the electrostatic precipitator: 1. Stop the gas supply, cut off the power, and stop the nitrogen supply in accordance with the shutdown procedures for the electrostatic precipitator. 2 Confirm that the temperature of the electric capture insulation box is normal and that the electric heater is operating properly. 3. Press the “Stop” and “Power” buttons located above the control cabinet in sequence to cut off the power supply to the electrostatic tar catcher. 4. After confirming that the drain pipe of the electrostatic precipitator is unobstructed, open the valve for spraying hot ammonia water and use it to spray the electrostatic precipitator for a period of (15–20) minutes. 5 Close the main ammonia pipeline valve to stop the ammonia injection, and drain the liquid accumulated in the pipeline. 6. After stopping the spraying for 20 minutes, press the “Power” button and the “Start” button on the control cabinet to start the electrostatic tar catcher.
Start-up and shutdown operations of the blower. Start-up operation of the blower: 1. The shift supervisor issues the command to start the blower, and the on-duty team leader oversees the start-up process. 2. Contact the control room, substation, rising pipe, and rear positions to inform them of the startup time. 3 With the assistance of electricians and fitters, check whether all equipment is in good condition. Check that the oil level in the oil tank of the oil pump station is within the specified range, that all instruments are in good condition, and that the water seal tank of the blower is filled with water, then report to the shift supervisor. 4. Check the oil temperature in the blower oil station and the hydraulic coupler; activate the heater when the temperature is below 5°C, and activate the oil cooler when it exceeds 40°C. Ensure that the oil levels in the blower oil station and the coupler’s oil tank are within the specified technical ranges. 5. Notify the electrician to supply power, and start the oil pump for the blower’s oil station as well as the auxiliary oil pump of the hydraulic coupler (the blower’s oil pump has pumps A and B; when pump A is in operation, the knob for automatic startup of the oil pump should be set to the “A in use, B standby” position, while when pump B is in operation, the knob should be set to the “B in use, A standby” position). 6. Check whether the oil pressure in the blower oil circuit and the hydraulic coupler oil circuit systems is normal. 7. Check whether oil is returning to each oil supply point of the blower and the hydraulic coupler, as well as to the high-level oil tank. 8 Monitor and ensure that the cooling water pressure in the oil cooler is slightly lower than the oil pressure. 9 Warm-up: Use steam to clean the downflow pipes; the warm-up temperature should not exceed 70°C. During warm-up, use the steam from the outlet steam pipes and various downflow pipes for heating. The valves should be kept partially closed, and the warm-up process should not last too long (warm-up is not necessary for the first start-up). During the warm-up, any condensate water generated must be drained immediately. Finally, close all drain valves (including those on the coal gas pipes in front of and behind the machine, as well as those on the main circulation pipes). 10. Close the clutch of the electric barring device and start the barring motor to perform barring. 11 Check whether the blower’s cranking is smooth. Once the fitter confirms there are no issues, stop the turning motor and disengage the clutch of the turning device. Set the control switch of the 12 hydraulic coupler electric actuators to the “manual” position, and ensure that the manual lever of the hydraulic coupler is in the “0” position. 13 Open the blower outlet valve and inform the substation to supply power. 14 Start the blower motor. 15 Gradually increase the speed of the hydraulic coupling, and monitor and maintain the blower’s speed at above (to be determined) revolutions per minute. 16 Gradually open the gas inlet valve of the blower to 50%, and at the same time use the hydraulic coupling control button to keep the suction pressure in front of the machine as well as the pressure in the gas collection pipe within the specified range. When starting up for the first time or when the amount of gas is insufficient, it is possible to slightly open the large circulation pipe; efforts should be made to avoid operating the blower at speeds near its critical speed. After the suction force in front of machine 17 and the pressure in the gas collection pipe have stabilized, open the drain valve on the blower unit. 18. When the pressure gauge P after the oil filter shows a value of 0.2–0.25 MPa, stop the auxiliary oil pump of the coupling. Notify the control room and the production department’s dispatch team that startup is complete. Shutdown procedure for the blower: 1. The shift supervisor issues the command to shut down the blower, and the on-duty shift leader oversees the shutdown process. 2. Contact the control room, substation, rising pipe, and rear positions to inform them that shutdown preparations are underway. 3. Start the auxiliary oil pump of the hydraulic coupling for the fan to be stopped. 4. Adjust the hydraulic coupler electric actuator to reduce the speed of the blower, while gradually closing the blower inlet valve until it is fully closed. Set the scoop of the hydraulic coupler to the “0” position, and then press the button to stop the blower motor. 5 After the blower motor and hydraulic coupler have completely stopped rotating, close the blower outlet valve. 6. Keep the blower main oil pump and the hydraulic coupler auxiliary oil pump running for about half an hour, then cut off the cooling water to the oil cooler (when shutting down in winter, ensure water circulation to prevent freezing). 7. Notify the control room and the production department’s dispatch team that the shutdown is complete. 8. After stopping, turn the machine every half hour; once it has returned to normal temperature, turn it once per shift. Blower replacement procedure: 1. The shift supervisor issues the order to replace the blower, and the on-duty section chief organizes the replacement process. 2. Contact the control room, substation, riser pipe, and rear posts to inform them that a vehicle change is pending. 3 Follow the startup procedures to prepare the blower to be started (3–13). 4 Start the blower motor, and at the same time adjust the hydraulic coupler actuator so that the hydraulic coupler operates under the same conditions as the drive coupling. 5. Slowly open the inlet valve of the blower that is to be started, while simultaneously slowly closing the inlet valve of the blower that is to be stopped. Monitor the suction gauge on site to ensure it remains within the specified range, and keep both the suction pressure in front of the machine and the pressure in the exhaust duct within the designated limits. 6. Observe whether the blower is operating normally. 7 Stop the blower to be stopped according to the shutdown procedure. 8. Notify the control room and the production department’s dispatch team that the vehicle swap is complete.
Starting up and shutting down of the mechanical ammonia clarification tank: For starting up: 1. Under the assistance of electricians and fitters, check the rotation direction of the motor, as well as the operation of the scrapers, sprockets, and reducer. 2 Check whether the equipment, valves, and pipelines are ready for operation; ensure that the vent pipe is in a closed state, and remove any debris from the system. 3. Open the inlet valve leading to the mechanical ammonia clarifier; once the ammonia level in the clarifier reaches 2/3 of its capacity, open the outlet valve for the ammonia from the mechanical ammonia clarifier. 4 Adjust the inlet valves feeding into the mechanical ammonia clarification tanks to ensure that the amount of ammonia entering each tank is as uniform as possible. 5. When the oil level in the mechanized ammonia clarification tank reaches the first detection valve at the bottom, open the tar outlet valve to allow the tar to flow into the intermediate tar tank. Shutting down: If the mechanical ammonia clarification tank needs to be shut down for maintenance, the tar inside the tank should be pumped out in advance and the oil pressure valve should be closed; thereafter, the inlet valve of the mechanical ammonia clarification tank should be closed. 2 Close the ammonia outlet valve of the mechanized ammonia clarification tank to prevent ammonia from flowing back. 3. Open the bottom vent valve of the mechanical ammonia clarification tank to drain the liquid inside it. Be careful not to do this too quickly, and monitor the liquid level in the drainage tank to prevent overflow. 4 When draining to the bottom, if there is blockage such as tar residue, it can be cleaned with steam before draining. 5 Stop the operation of the scraper conveyor.
1 Startup of the centrifugal pump 1.1 With the assistance of electricians and fitters, check whether the foundation screws are loose and verify that all components are in good condition. 1.2 Check that there is sufficient lubricating oil, and close the pressure gauge control valve. 1.3 The disc rotation was completed successfully over three weeks. 1.4 Open the valve of the inlet pipe to fill the inlet pipe and the pump body with water, thereby expelling all air. 1.5 Once everything is ready, close the switch to start the pump, slowly open the pump’s outlet valve, then open the pressure gauge control valve to adjust the pressure and flow rate to the specified values. 1.6 After starting the pump, carefully observe its operation; if any abnormalities are detected, address them promptly or activate the backup pump. To shut down a centrifugal pump, close the outlet valve of the pump. 2. Turn off the pump by closing the switch. 3 Close the inlet valve of the pump. 4. During winter or when the pump is not in use for an extended period, drain the liquid inside the pump.
Starting and stopping of the air flotation oil remover – Starting procedures: 1. Before starting, check whether all valves on the pipelines connected to the air flotation oil remover open smoothly; once this is confirmed, close all the valves. 2. Check that the circulating water jet pump is functioning properly. 3. Open the inlet valve of the air flotation oil removal unit to allow the remaining ammonia water to enter the device, and then open the outlet valve and scum valve inside the device. 4. When the amount of wastewater in the equipment reaches about 75% of the volume of the air flotation oil remover, open the inlet and outlet valves of the circulating water jet pump, as well as the two connection valves between the inlet and outlet, to remove any residual air from the pump casing and pipelines. 5. Start the circulating water jet pump, open the exhaust valve at the top of the dissolved air tank to remove any residual air from the tank and pipelines, then close the exhaust valve and open the pressure gauge control valve. 6. Adjust the four aeration nozzles at the bottom of the dissolved air tank to ensure that the pressure in the tank is maintained between 0.2 and 0.3 MPa. 7. On the pipeline connecting the inlet and outlet of the circulating water jet pump, a suction valve can be installed on the jet device; the opening degree of this suction valve should be set as high as possible while still ensuring the normal operation of the water pump. Generally, the opening degree of the suction valve ranges from 1/3 to 1/4. 8. Adjust the height of the control plates in the water tank of the equipment to ensure that the liquid level inside the oil removal machine meets the requirements of the production process; adjust the heights of the small plates on the 4 oil collection trays within the equipment to enable the oil residues at each stage to be discharged properly. 9. Regularly check the level of heavy oil at the bottom of the air flotation oil removal unit; it is generally advisable to drain the oil every 30 days. 10. If the viscosity of the residual liquid at the bottom of the degreasing machine is high and it is difficult to drain it, steam can be used for purging, after which it can be drained through the drainage pipe. 11. The sewage pipes must be properly insulated to prevent freezing in winter. Shutting down procedure: 1. Close the water inlet valve of the equipment, close the suction valve of the jet pump, close the inlet and outlet valves of the circulating water jet pump, and stop the pump. 2. If shutdown is prolonged, drain the ammonia in the equipment and pipelines to prevent the equipment from being damaged by freezing.
1. Check whether the filter press’s hydraulic station, electrical control system, the filter press itself, the arrangement and compression state of the filter plates, the installation of the filter cloth, as well as all the pipelines and valves are in condition to start operation. 2. After confirming that the filter press is properly compressed, open the liquid discharge valve, start the feed pump and keep the feed pressure below the rated value, then gradually open the feed valve to reach normal feeding levels. 3 Pay attention to observing changes in the filtrate and feed pressure. 4 Unloading Operation 4.1 When manual operation is selected, press the automatic plate pickup button to pick up the plate. 4.2 Press the manual plate-pulling button to automatically pull the plate and remove the filter cake between the ordinary box-type filter plates and the diaphragm filter plates. 4.3 Repeat the above steps; after removing all inter-plate filter cakes, the trolley returns to its original position automatically. 4.4 When automatic operation is selected, the process proceeds as follows: start → release → pull the plate to unload the material → compress → maintain pressure → filter → end, with the filter press carrying out this cycle automatically.
Safety Operating Procedures for Blowers 1. The blower operation area is considered a critical zone and a Class 1 no-fire area; it is necessary to strictly adhere to the management regulations for critical areas as well as all other safety production rules. Unrelated personnel are strictly prohibited from entering this area. Those who wish to visit for learning purposes or conduct inspections must first submit an application, and only with the approval of the relevant supervisors can they enter, with proper records kept in this regard. 2. The fire protection facilities in the workplace must not be misused or damaged, and they must be kept clean; it is strictly prohibited to start fires, smoke, or bring in flammable materials without permission. 3. It is prohibited to place flammable items and debris such as cloth, wood, and oils on steam pipes or inside the room. 4. When operating buttons, switches, valves, or controlling equipment, it is necessary to first confirm the situation to ensure the safety of the operator and production processes. 5. During equipment maintenance, close cooperation with the maintenance workers is necessary to create safe conditions and ensure that the maintenance tasks are completed promptly. 6. Maintain good ventilation indoors. 7. Do not interrupt the cooling water supply for the lubricating oil while the motor is running. 8. The oxygen content in gas must not exceed 1.0% (by volume). 9. It is strictly prohibited to walk indoors in shoes with iron nails. 10. It is prohibited to start the motor when the hydraulic coupling is not in the “0” position. 11. It is prohibited to start the blower when there is a gas load. 12. After the turning motor stops, it is prohibited to start the motor if the turning clutch is not in the “disengaged” position. 13. The blower is prohibited from use in any of the following situations: 1) Defects in the unit and its auxiliary equipment. 2) The rotor has not undergone a balancing test. 3) No safety measures. 4) Without the consent of the substation and dispatch. 14. In any of the following situations, the machine should be stopped immediately if emergency measures are ineffective: 1) The unit experiences severe vibration of 0.1 mm or a clear sound of metal hitting is heard. 2) The bearing is smoking. 3) The temperature of a certain bearing shell exceeds the specified limit. 4) When the oil pressure is below 0.05 Mpa and activating the backup oil pump is ineffective. 5) There is a severe oil leakage in the oil system that cannot be replenished, causing the oil level to drop below the lowest mark on the gauge. 6) Tar enters the lubricating oil. 7) The fire in the oil system cannot be extinguished. 8) Fire or explosion in the gas system ahead of the blower. 9) The oxygen content in the gas exceeds the specified level; the cause cannot be identified and it is not possible to reduce it promptly. 10) There is severe fluid impact inside the machine. 15. It is strictly prohibited for air to enter the gas system or for gas to leak out. 16. The use of substandard and leaking turbine oil is prohibited. 17. When the standby blower is in standby mode, it must not be cleaned with steam or exposed to steam. 18. After the blower has been repaired, it must not be tested under no-load conditions. 19. The water pressure at the inlet of the oil cooler should be lower than the oil pressure at the inlet. 20. In the event of failure in the automatic adjustment of the hydraulic coupler’s scoop tube, the actuator must be immediately switched to the “manual” position. Safety procedures for the primary cooler: 1. It is prohibited to allow situations such as pump failure, leakage from the tank, or unauthorized personnel operating the mechanical equipment to occur. 2. Leaks in gas equipment and the pipelines associated with the workstation are prohibited; if any damage occurs, it must be reported to the workshop immediately for handling. 3. The circulation of ammonia water must not be interrupted arbitrarily, and it is prohibited to drain the cooling water from the primary cooler as well as the water in the water seal tank. 4. It is prohibited to shut off the gas inlet and outlet valves of the primary cooler without authorization; no liquid shall accumulate inside the gas chamber of the primary cooler. 5. When starting up the primary cooler, it is prohibited to supply water first and then gas. After the primary cooler is purged with steam, it is strictly prohibited to supply cooling water immediately after stopping the steam supply. 6. It is prohibited to start fires privately or smoke at work sites. When equipment requires repair by means of fire, a fire permit must be obtained first, effective safety measures must be taken, and work may only proceed with a dedicated person on site to give instructions. 7. Overloading of the equipment is prohibited, and the standby pump must be turned manually at the end of each shift. 8. If the motor or bearings start smoking or make abnormal noises, stop the machine immediately and inform the relevant personnel. 9. Wiping is prohibited during mechanical operation. Do not wipe the motor and switches with a wet cloth, and motors over 40KW must not be started three times in a row. 10. When servicing the primary cooler, it is necessary to block the pipelines leading to the gas system with blind flanges in advance. 11. Fire-fighting equipment at the post must not be used improperly and should be kept clean and in good condition. Safety operating procedures for electric precipitators: 1. It is strictly prohibited to switch between air, nitrogen, and gas without opening the bypass valve. 2. It is strictly prohibited to supply gas to the insulated box without filling it with nitrogen. 3. After spraying hot ammonia water, the ammonia valve must be closed, and this should be done under conditions where the temperature of the insulated box and the nitrogen pressure are normal. 4. If, during operation, it is observed that the “KW” and “MA” tables fluctuate significantly and frequently, along with the flashing of the “Flashover” signal light, the power supply should be shut down immediately and the situation reported to the duty shift supervisor. 5. During operation, if a flashover is detected between the high-voltage conductor and ground, the power supply must be shut down for inspection. 6. If tests show that the oxygen content is above 1.0%, the power supply should be turned off for inspection. 7. During operation, no one is allowed to arbitrarily turn the knobs and hand inserts inside the equipment. 8. If maintenance is required for the electrostatic precipitator, blind flanges must be installed at the gas inlet and outlet. Before opening the lower manhole, the vent pipe must be closed, and the maintenance safety procedures must be followed. 9. If steam is used to clean the electrostatic precipitator, it must be cooled to room temperature before it can be turned on.
Emergency Plan for Production Accidents in the Desulfurization Unit – Power Outage Procedures: I. Shut down high-voltage power 1. After the power is cut off, immediately press the stop button for the circulation pump. 2. Close the inlet and outlet valves of the pump, as well as the compressed air valve leading to the regeneration tower; if it is winter, drain the liquid stored in the pipes. 3. Pay attention to adjusting the liquid levels in the absorption tower, reaction tanks, etc., to prevent overflow as much as possible, and notify the control room and shift supervisor at the same time. Find out the cause of the power outage and be ready to start the vehicle at any time. 4. If the power outage lasts for a long time, it should be treated as a shutdown; inform the blower to pay attention to pressure changes and slowly open the valve of the gas circulation pipe in the desulfurization tower. 5. Close the gas inlet and outlet valves of the desulfurization tower. 6. Stop the cooling water supply to the circulating fluid heat exchanger; the pre-cooling tower, the pump used for circulating water in the pre-cooling tower, the heat exchanger for residual ammonia water, the foam tank, the foam pump, and the plate and frame filter press should also be shut down as per standard procedures. 7. In winter, the liquid should be drained to prevent freezing damage. II. Shut down low-voltage power supply: 1. Immediately press the stop buttons for the pre-cooling tower circulation water pump, foam pump, and plate and frame filter press. 2. Close the inlet and outlet valves of the circulation water pump and the foam pump in the pre-cooling tower. 3. Stop the cooling water supply to the heat exchanger for residual ammonia water; in winter, drain the liquid in the pipes to prevent freezing damage. 4. Close the heating steam valve of the foam tank, and vent the sulfur foam inside the tank. IV. Water treatment during shutdown 1. If the circulating water is to be shut down, the ammonia valve feeding the pre-cooling tower and the update valve can be closed to maintain production in the desulfurization unit for a short period of time. 2. If cold water is shut off, slightly open the valve of the gas supply pipe in the pre-cooling tower to maintain production during a short period of water outage; if the outage lasts longer, handle it as a normal shutdown. 3. If it is the pump’s cooling water that is shut off, the pump should be stopped; otherwise, follow the normal procedures for shutting down the system. V. Shutting down steam supply 1. Shutting off steam: (1) For a short-term shutdown of steam supply, wait until the steam supply is restored; if there is a large amount of material in the foam tank, follow these steps: 1) Stop the foam pump. 2) Close the steam valve leading to the foam tank ； 3) Close the compressed air valve feeding into the regeneration tower. (2) Prolonged steam shutdown: Stop the foam pump and close the steam valve of the foam tank ； During winter, the condensate water in the pipes should be drained. 2. Stop compressed air supply: Close the compressed air valve feeding into the regeneration tower. The desulfurization liquid pump can continue to operate normally during short-term gas shutdowns ； If the gas supply is interrupted for an extended period, stop operating the desulfurization liquid circulation pump. VI. Liquid leakage in the desulfurization system: Promptly address the leak points to stop the leakage and prevent it from entering the production wastewater or rainwater drainage systems, thereby avoiding contamination of the water systems. Collect the leaked liquid into underground drainage tanks for centralized treatment to prevent pollution.