A dynamic control system and method for SCR inlet smoke temperature of a boiler
A control system and dynamic control technology, applied in feedwater heaters, preheating, steam generation, etc., can solve the problems of increasing, unable to reach the catalyst working smoke temperature, and SCR can not be used as a
Active Publication Date: 2018-07-24
北京清远顺合环保科技有限公司
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However, in some boilers under low load, the inlet flue temperature of the SCR cannot reach the working flue temperature of the catalyst, and the SCR has to stop running. However, the concentration of NOx produced by the boiler will increase at low load, which means that in the more need for denitrification In some cases, SCR can't be used as
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[0022] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principles of the present invention.
[0023] Such as figure 1 As shown by the dotted line, the flow of the original boiler feed water is that the feed water pipe of the economizer enters the inlet header 14 of the economizer, then passes through the economizer 15 to raise the temperature of the feed water, merges in the middle header 16 of the economizer, and then enters the economizer The suspension pipe 17 of the economizer is then merged at the outlet header 18 of the economizer, and finally sent to the inlet header of the water wall or the steam drum by the outlet main pipe of the economizer. When the boiler is under low load, especially when the load is below 50%, the flue gas tempera...
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The invention provides a dynamic control system and method for the smoke temperature at an SCR inlet of a boiler. The system comprises an economizer feed water main, an economizer, an economizer outlet main, a bypass pipeline and a recirculation pipeline. The two ends of the bypass pipeline and the two ends of the recirculation pipeline are connected with the feed water main and the economizer outlet main correspondingly. Water in the bypass pipeline flows from the feed water main to the economizer outlet main; and water in the recirculation pipeline flows from the economizer outlet main to the feed water main. The bypass pipeline is provided with a regulating valve, a check valve and the like. The recirculation pipeline is provided with a hot water recirculation pump, a circulation pump minimum flow pipeline, a regulating valve, a check valve and the like. When the SCR insufficient temperature is small, only the bypass pipeline needs to be opened to regulate the smoke temperature, and when the SCR insufficient temperature is high, the bypass pipeline and the recirculation pipeline are opened at the same time, and the smoke temperature at an outlet of the economizer is further increased. By means of the dynamic control system and method, the regulating range of the smoke temperature at the outlet of the economizer is wide, operation is convenient, operation flexibility is high, and the requirement for the temperature of smoke entering SCR under a low load can be met.
Description
technical field [0001] The invention relates to boiler wide-load denitrification technology, in particular to a dynamic control system for SCR inlet smoke temperature of a boiler. Background technique [0002] The main way of power generation in my country is coal power, and its peak regulation is inevitable. However, in some boilers under low load, the inlet flue temperature of the SCR cannot reach the working flue temperature of the catalyst, and the SCR has to be shut down. However, the concentration of NOx produced by the boiler will increase under low load, which means that in areas where denitrification is more needed Under such circumstances, SCR can't act instead. As the country's air pollutant emission requirements for thermal power units become more and more stringent, it will become very meaningful for thermal power units to meet the NOx emission limit requirements within a wide load operating range. The flue gas temperature improves the load adaptability of the...
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IPC IPC(8): F22D1/00F22D1/12
CPCF22D1/00F22D1/12
Inventor 王珊武润梅黄建龙
Owner 北京清远顺合环保科技有限公司