One Question per Day: Methanol Technology Exchange Edition 20180623
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This post was last edited by Xiao Yu on 2018-6-23 at 21:47. Let’s learn from the best practices in the “Study & Brothers” section. There are rewards for correct answers; everyone who participates gets a reward. Let’s grow and mature through these Q&A sessions. It’s a simple plan I jotted down at the beginning of the operation using ethylene glycol; it’s just a brief overview for your reference: Steps for replacing the preheating burner with a process burner: (Revised version) Using a series of examples as examples. Prerequisites: 1. The gasification furnace must be preheated to 1100 degrees Celsius and held at that temperature for about 4 hours. 2. The flare pilot light must have been successfully ignited, and the flare system must be operating properly. 3. The level of the waste pot is 80%, the level of the water jacket is 80%, the level of the burner cooling water tank is 90%. Nitrogen is used for pressurizing the burner, and the steam for heating is ready for use. The converted high-pressure nitrogen buffer tank has been put into use. 4. The utility systems have produced qualified nitrogen and oxygen, and the steam pipelines at all levels have been properly installed and put into use. 5. The ignition programming interlock has passed the debugging test. 6. The natural gas compressor is operating normally; the process natural gas, after being heated and desulfurized to meet the required standards, exits at the outlets of zinc oxide B-22002A/B. It is then vented at PV-1010, in front of the converter. Oxygen has been heated to 180°C in E-23101 and is vented at HZV-1205. (Maintain the minimum flow rate for ignition feeding) Ready to replace the process burner. ⑴A circulation system for the cooling water hoses of the process burner was established; the burner cooling water pump P--23103 was started. The interlock test passed, and the standby pump on site was filled with liquid, depressurized, warmed up, and set to position “A”. (2) Operate the burner cooler E-23107 for the process; fill the burner cooling water tank V-23102 with nitrogen, gradually increase the pressure in the cooling tank to 2.5 MPA, and introduce heating steam to gradually raise the temperature of the cooling water to 160°C. (3) E-23103/23104/23105/23106 and wash tower C-23101 were put into operation, and the discharge process for the process condensate at the bottom of the wash tower was established. Put into operation the waste boiler drain flash tank and dosing system. (4) Check that the valve positions of the control valves and isolation valves for process steam, natural gas, oxygen, protection steam, heating steam, and protection nitrogen are set according to the requirements for feeding material and igniting the furnace. Temporarily disable the transformation system. (5) Adjust the steam supplied to the start-up extractor, maintaining a slight negative pressure of 6–10 mmH2O in the gasifier. Stop using fuel in the preheating burner, close the fuel gas control valve and the stop valve, and close the burner air damper to prevent air from being supplied into the furnace. (6) Remove the preheating burner, install the process burner that is ready for installation at the gasifier nozzle, connect all relevant flanges, and use explosion-proof equipment. Be careful to prevent the degreased flanges on the oxygen pipeline from being re-contaminated during lifting. Prevent burns and mechanical accidents. Stop the extractor, open the upper and lower steam drain valves of the extractor at 1.7 MPA, close the shut-off valves for HV-1031 and the process gas from the waste boiler to the extractor, thereby isolating the extractor from the system. (7) Change the burner cooling water from a hose to a rigid pipe. After the flow rate, pressure, and operation of the burner cooling water are stabilized, check the operation of the cooling water circulation pump P-23101 to ensure it is functioning properly. Once the pressure and temperature in the burner cooling water tank have been increased to normal levels, contact the instrumentation team to activate the interlock system for the burner cooling water system. (8) Purge the conversion system with nitrogen and analyze the O2 content in the conversion furnace
Steps for replacing the preheating burner with a process burner: (Revised version) Using a series of examples as examples. Prerequisites: 1. The gasification furnace must be preheated to 1100 degrees Celsius and maintained at that temperature for approximately 4 hours. 2. The flare’s permanent light must have been successfully ignited, and the flare system must be operating properly. 3. The level of the waste pot is 80%, the level of the water jacket is 80%, the level of the burner cooling water tank is 90%. Nitrogen is used for pressurizing the burner, and the steam for heating is ready for use. The converted high-pressure nitrogen buffer tank has been put into use. 4. The utility systems have produced qualified nitrogen and oxygen, and the steam pipelines at all levels have been properly installed and put into use. 5. The ignition programming interlock has passed the debugging test. 6. The natural gas compressor is operating normally; the process natural gas, after being heated and desulfurized to meet the required standards, exits at the outlets of zinc oxide B-22002A/B. It is then vented at PV-1010, in front of the converter. Oxygen has been heated to 180°C in E-23101 and is vented at HZV-1205. (Maintain the minimum flow rate for ignition feeding) Ready to replace the process burner. ⑴A circulation system for the cooling water hoses of the process burner was established; the burner cooling water pump P--23103 was started. The interlock test passed, and the standby pump on site was filled with liquid, depressurized, warmed up, and set to position “A”. (2) Operate the burner cooler E-23107 for the process; fill the burner cooling water tank V-23102 with nitrogen, gradually increase the pressure in the cooling tank to 2.5 MPA, and introduce heating steam to gradually raise the temperature of the cooling water to 160°C. (3) E-23103/23104/23105/23106 and wash tower C-23101 were put into operation, and the discharge process for the process condensate at the bottom of the wash tower was established. Put into operation the waste boiler drain flash tank and dosing system. (4) Check that the valve positions of the control valves and isolation valves for process steam, natural gas, oxygen, protection steam, heating steam, and protection nitrogen are set according to the requirements for feeding material and igniting the furnace. Temporarily disable the transformation system. (5) Adjust the steam supplied to the start-up extractor, maintaining a slight negative pressure of 6–10 mmH2O in the gasifier. Stop using fuel in the preheating burner, close the fuel gas control valve and the stop valve, and close the burner air damper to prevent air from being supplied into the furnace. (6) Remove the preheating burner, install the process burner that is ready for installation at the gasifier nozzle, connect all relevant flanges, and use explosion-proof equipment. Be careful to prevent the degreased flanges on the oxygen pipeline from being re-contaminated during lifting. Prevent burns and mechanical accidents. Stop the extractor, open the upper and lower steam drain valves of the extractor at 1.7 MPA, close the shut-off valves for HV-1031 and the process gas from the waste boiler to the extractor, thereby isolating the extractor from the system. (7) Change the burner cooling water from a hose to a rigid pipe. After the flow rate, pressure, and operation of the burner cooling water are stabilized, check the operation of the cooling water circulation pump P-23101 to ensure it is functioning properly. Once the pressure and temperature in the burner cooling water tank have been increased to normal levels, contact the instrumentation team to activate the interlock system for the burner cooling water system. (8) Purge the conversion system with nitrogen and analyze the O2 content in the conversion furnace