A method and system for optimizing ammonia injection in scr system of thermal power plant
A technology of SCR system and thermal power plant, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve the problems of excessive nitrogen oxides and excessive ammonia injection, so as to save consumption and solve the problem of excessive nitrogen oxides Effect
Active Publication Date: 2020-07-10
BEIJING ENERGY INVESTMENT HLDG +1
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[0006] The purpose of the present invention is to provide a thermal power plant SCR system optimized ammonia injection method and system, which can greatly improve the denitrification efficiency of the unit unit, and solve the problem of excessive nitrogen oxides in the flue gas or excessive ammonia injection
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[0044]The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0045] The purpose of the present invention is to provide an optimized ammonia injection method and system for the SCR system of a thermal power plant, which can greatly improve the denitrification efficiency of a unit unit and solve the problem of excessive nitrogen oxides or excessive ammonia injection in the flue gas.
[0046] figure 2 The flow chart of the optimized ammonia injection method for the SCR system of the thermal power ...
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The invention discloses an optimized ammonia injection method and system for a SCR (selective catalytic reduction) system of a thermal power plant. The method comprises the steps that a SCR (selectivecatalytic reduction) region of the thermal power plant is divided into two symmetrical sides, namely a side A and a side B, and purging is carried out on one side each time; in the 3 seconds before purging of a flue gas sampling device on the side A of the SCR (selective catalytic reduction) region, the opening degrees of ammonia injection adjusting valves on the side A and the side B of the SCR(selective catalytic reduction) region are detected, and the values of the opening degrees of the ammonia injection adjusting valves on the side A and the side B of the SCR (selective catalytic reduction) region are correspondingly recorded; the values of the opening degrees of the ammonia injection adjusting valves on the side A and the side B are compared; the opening degree of the ammonia injection adjusting valve during the purging period of the side A is determined according to the comparison result; and after purging of the flue gas sampling device on the side A is completed, the openingdegree of the ammonia injection adjusting valve on the side B of the SCR (selective catalytic reduction) region is adjusted according to the logic of the opening degree of the adjusting valve on theside B. The method has the advantages that the phenomenon that nitrogen oxide in flue gas exceeds the standard can be avoided, and the use amount of ammonia gas can be effectively reduced.
Description
technical field [0001] The invention relates to the field of SCR (Selective Catalytic Reduction, selective catalytic reduction technology) systems in thermal power plants, in particular to an optimized ammonia injection method and system for an SCR system in thermal power plants. Background technique [0002] figure 1 It is a schematic diagram of the SCR of a coal-fired boiler. In the figure, 1 is the flue gas sampling system at the A-side outlet, 2 is the A-side flue gas outlet sampling pipeline, 3 is the B-side outlet flue gas sampling system, and 4 is the B-side flue gas outlet sampling pipe Road, 5 is the A-side SCR area, and 6 is the B-side SCR area. [0003] The flue gas sampling system measures the nitrogen oxide concentration in the flue gas from the SCR outlet sampling pipeline in real time, and the measured nitrogen oxide concentration value is sent to the DCS (Distributed Control System, decentralized control system) screen. Due to the large soot content in the ...
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IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8625B01D2251/2062B01D2258/0283
Inventor 李江南范昕王六虎王振华张劲松刘俊肖宇解冠宇周虹任王学敏江小明夏巡刘益吕红军王鹏马晓君王姣姣徐君龙王世辑
Owner BEIJING ENERGY INVESTMENT HLDG