Waste heat boiler steam drum liquid level control system

Abstract

The invention discloses a waste heat boiler steam drum liquid level control system, and relates to the field of waste heat boilers. The waste heat boiler drum liquid level control system is installedat a waste heat boiler, and the waste heat boiler comprises a steam drum, a flue, a water feeding and regulating valve and a circulating pump, wherein front-end smelting equipment is installed at thefront end of the waste heat boiler, and water supply equipment and rear-end equipment are installed at the rear end of the waste heat boiler. The system comprises detecting components and a controller. By means of the waste heat boiler steam drum liquid level control system, an area control mode is adopted for the steam drum liquid level, the corrected liquid level value is not controlled througha single set value anymore, instead, a normal working area is additionally arranged on the basis of an existing set value, when the liquid level detection value is slightly changed, the water feedingand regulating valve is not controlled, and when the liquid level detection value is dramatically changed, the water feeding and regulating valve is controlled. In this way, control disordering causedby frequent regulating can be avoided; meanwhile, the using frequency of adjusting equipment is lowered, the service cycle of the equipment is prolonged, the control system is saved, and safe runningof the waste heat boiler is ensured.

Description

technical field [0001] The invention relates to the field of waste heat boilers, in particular to a steam drum liquid level control system for waste heat boilers. Background technique [0002] As a kind of energy saving and emission reduction equipment, the waste heat boiler is an indispensable key link in the smelting process. Its main function is to cool down the flue gas generated by the furnace body in the smelting process, and at the same time use the heat released in the flue gas cooling process to generate Steam, which is then used in other production processes. Since the waste heat boiler is closely integrated with the front-end smelting process, the working conditions of the front-end process directly affect the water supply of the waste heat boiler. In the automatic control mode, once the front-end process changes, it is necessary to judge whether the steam volume has changed according to the change of the flue gas volume. , and then use the water supply regulatin...

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Problems solved by technology

[0003] However, during the operation of the project, the front-end smelting process changes frequently, such as furnace start-up, shutdown, and feed rate changes, so it is easy to cause frequent changes in the flue gas volume. If the waste heat boiler drum liquid level is under automatic control mode, the feed water In order to keep the drum liquid level at the set value, the regulating valve will always ...

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