Automatic control system for flue gas denitration of electric power plant

Abstract

The invention relates to an automatic control system for flue gas denitration of an electric power plant, which comprises the components of: an ammonia water storage tank, a denitration device, a positive feedback detecting unit, a negative feedback detecting unit and a DCS system control unit. The outlet of the ammonia water storage tank is provided with an ammonia flow regulating valve which is connected with an ammonia flow regulator. The denitration device comprises a flue channel, a reactor and an ammonia spraying grid. The positive feedback detecting unit comprises an ammonia flow detector, a flue gas detector and an NOx content detector. The negative feedback detecting unit comprises an NOx flow detector. The flue channel is internally provided with a flue gas flow detector and a NOx content detector. The ammonia flow detector is arranged outside the ammonia spraying grid. The NOx flow detector is arranged outside the reactor. The signals acquired by the ammonia flow detector, the flue gas flow detector, the NOx content detector and the NOx flow detector are transmitted to a DCS system. The DCS system controls the ammonia flow regulator for realizing controlling for ammonia spraying amount of the reaction system. The automatic control system has functions of: realizing reliable control, saving manpower, and effectively controlling emission of NOx in flue gas of the electric power plant.

Description

technical field [0001] The invention relates to an automatic control system for flue gas denitrification in a power plant. Background technique [0002] At present, environmental protection is concerned about NO x The emission of the new standard is implemented, and the NO controlled in the new standard x Emissions are more stringent, which puts the power plant NO x The control puts forward higher requirements. Currently NO x Most of the control adopts the control method of ammonia injection, and the control method is mostly manual operation control, which is difficult to control, and the NOx content at the outlet often fluctuates in a wide range, which seriously affects the environmental protection indicators of the power plant. Contents of the invention [0003] The purpose of the present invention is to provide a reliable control, save manpower, and can effectively control NO in the flue gas of the power plant. x Automatic control system for flue gas denitrificatio...

AI Technical Summary

Problems solved by technology

Currently NO x Most of the control methods adopt the control method of ammonia injection, and the control method is mostly manual operation control, which is difficult to control, and the NOx content at the outlet often fluctuates in a large range, which seriously affects the environmental protection indicators of the power plant

Images