Three questions about gas generators. Hope someone knowledgeable can answer~
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1. Steps for the normal shutdown of a gas stove. (It is necessary to explain clearly how to operate the steam buffer tank, fan, and oil pump.) ) It’s not shutting down to discharge slag! 2. How to handle the double-line valve of the steam buffer tank during maintenance. 3. How to handle the furnace when performing hot work with a dry-type water seal. I hope those who know can help answer this. It would be enough if you could explain the general idea~ Thank you
The proper procedure for shutting down a gas generation furnace is as follows: first, use the shutdown button on the automatic control system or microcomputer to stop the furnace, then seal it off using the water seal in the gas washing tank, thereby cutting off any connection between the furnace and the outside world； Stop the steam first, then the blower, and finally the oil pump. The second and third questions weren’t explained clearly by the original poster.
①Pause the operation of the gas stove, close the gas outlet valve of the scrubber tower, and remove the flange in front of the valve to isolate it from the production system. ②Follow the original driving procedures to produce qualified inert gas, and carry out purging of the single-furnace system until sampling and analysis at the flange where the gas outlet is located show satisfactory results. ③When the microcomputer reaches 5% of the blowing stage, it stops automatic operation; manually close the blowing valve, open the carbon addition and vent valve, and then stop the microcomputer. After opening the furnace lid and lighting it until flames appear at the furnace outlet, open the carbon addition and vent valves as well as the steam suction valve; stop the strip feeding machine, and close the upper and lower steam supply valves. The gas generator is then set aside (without turning off the flame) for furnace maintenance. When the temperature at the furnace outlet rises, carbon should be added promptly to suppress the flames. ④Open the vent valves of the jacketed boiler drum and the waste heat boiler drum, and close their steam outlet valves to maintain a certain liquid level. ⑤Remove the relevant flanges of the equipment and pipelines that require maintenance, and use exhaust fans to replace the air until the oxygen content in the sample taken from the area under maintenance is greater than 20%, indicating it is satisfactory.
After stopping the system according to the short-term parking procedure, open the vent valve of the gas holder to release the semi-water gas inside it, then close the vent valve. Next, generate an inert gas and purge the entire system (follow the procedures for initial startup) until it meets the required standards. (2) Shutdown of the gas generator: ① Reduce the amount of carbon added in the first and second stages before shutdown, increase the speed of the grate mechanism, appropriately raise the amount of steam supplied from above and below, reduce the amount of air used for blowing, lower the furnace temperature, and bring the height of the carbon layer to match the height of the jacket. ②After stopping the machine according to the short-term parking procedure, open the furnace lid, close the steam valves on the upper and lower blowers as well as the main steam valve, open the vent valves for the jacket boiler’s air tank and the waste heat boiler’s air tank, and close their steam outlet valves. ③Add cooling water to the jacket air tank and continuously discharge heat from the furnace; further increase the speed of the furnace strip machine, open the square door of the ash hopper to remove all the carbon, and then stop the furnace strip machine.