Waste incineration boiler denitration control method and system
A technology of waste incineration and control method, applied in the field of flue gas purification, can solve the problems of poor control effect, large fluctuation of nitrogen oxide concentration, and excessive discharge, etc. Effect
Pending Publication Date: 2021-11-02
GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD
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[0004] This application provides a method and system for controlling denitrification of waste incineration boilers, which are used to solve the technical problems of poor control effects in the prior art, resulting in large fluctuations in the concentration of nitrogen oxides in the net flue gas, and prone to excessive emissions
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[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0042] see figure 1 , a method for controlling denitrification of a waste incineration boiler provided in Embodiment 1 of the present application, comprising:
[0043] Step 101, calculating the denitration efficiency according to the concentration of nitric oxide and the amount of oxygen before and after denitration.
[0044] It should be noted that, in this embo...
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The invention discloses a waste incineration boiler denitration control method and a system. The method comprises the steps that calculating the denitration efficiency according to the nitric oxide concentration and the oxygen content before denitration and after denitration; calculating an ammonia nitrogen molar ratio according to the boiler operation state parameters at the same moment; establishing a first relational expression between the denitration efficiency and the ammonia nitrogen molar ratio, establishing a second relational expression between the nitric oxide concentration after denitration and the nitric oxide concentration of the purified flue gas, and establishing a function relation between the nitric oxide concentration before denitration and the boiler operation state parameters; and constructing an ammonia spraying control equation according to the denitration efficiency, the ammonia-nitrogen molar ratio, the first relational expression, the second relational expression and the function relation, and controlling the ammonia spraying amount according to the ammonia spraying control equation. Therefore, the technical problems that in the prior art, due to the fact that the control effect is poor, concentration fluctuation of nitric oxide in purified flue gas is large, and standard-exceeding emission is prone to occurring are solved.
Description
technical field [0001] The present application relates to the technical field of flue gas purification, in particular to a method and system for controlling denitrification of waste incineration boilers. Background technique [0002] In recent years, my country has built a large number of waste incineration boilers based on grate furnaces. After incineration of waste, a large number of pollutants will be produced, including nitrogen oxides, sulfur dioxide, hydrogen chloride, etc., which need to be purified by flue gas treatment equipment. Among them, the treatment of nitrogen oxides is mainly carried out by non-selective catalytic reduction (SNCR), that is, ammonia water is sprayed into the furnace of the waste incinerator to reduce nitrogen oxides into nitrogen. [0003] At present, the denitrification control method of the waste incinerator is mainly as follows: the operator manually adjusts the ammonia water adjustment valve and the process water adjustment valve accordin...
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Login to View More IPC IPC(8): B01D53/56B01D53/79
CPCB01D53/56B01D53/79B01D2258/0283B01D2251/2062
Inventor 沈跃良曾庭华周杰联李千军来笑蕊钟俊
Owner GUANGDONG ELECTRIC POWER SCI RES INST ENERGY TECH CO LTD