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Control method of SNCR denitration system of coal-fired unit

A technology for coal-fired units and control methods, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problem of difficulty in adjusting the urea solution of the spray guns in each area, and reduce operating costs, ensure uniform distribution, reduce The effect of the amount of ammonia slip

Pending Publication Date: 2021-03-19
XIAN THERMAL POWER RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing SNCR denitrification technology, it is difficult for the SNCR system to automatically adjust parameters such as the input of spray guns in each area and the concentration of urea solution sprayed by spray guns in each area according to the change of unit load.

Method used

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Embodiment Construction

[0018] Below in conjunction with embodiment the present invention is described in further detail:

[0019] The control method of the SNCR denitrification system of the coal-fired unit of the present invention comprises the following steps:

[0020] After the SNCR system of the unit is completed, the debugging experiment of the SNCR system is carried out. The specific process of the debugging experiment is as follows:

[0021] Test the unit respectively under 30%-100% load, put into the metering module, when the NOx value at the outlet of the SNCR reaches the design value, and the NOx distribution on the cross-section is uniform, and the average value of ammonia escape is less than the preset value, the flow rate of the urea solution, the removal rate after dilution The brine pressure value and the NOx value at the outlet of the SNCR, and build a database based on this;

[0022] When the actual unit is running, according to the load of the unit in the current period, the flow ...

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Abstract

The invention discloses a control method of an SNCR denitration system of a coal-fired unit, which comprises the following steps: acquiring urea solution flow in each metering module, a diluted desalted water pressure value and an NOx value at an SNCR outlet of the unit under different loads, and constructing a database according to the urea solution flow, the diluted desalted water pressure valueand the NOx value; during actual operation of the unit, searching for the corresponding urea solution flow and the diluted desalted water pressure value through the database according to the currentload of the unit, and then adjusting the urea solution flow and the diluted desalted water pressure value in a metering module to the urea solution flow and the diluted desalted water pressure value which are searched for from the database; and correcting the urea solution flow in the metering module according to the currently measured NOx value at the SNCR outlet, so as to keep the measured NOx value at the SNCR outlet consistent with the NOx value at the corresponding SNCR outlet under the current load in the database. The method can be used for automatically and quickly conducting adjustingaccording to the unit operation load and the NOx content at the SNCR outlet.

Description

technical field [0001] The invention belongs to the technical field of denitrification in power plants, and relates to a control method for an SNCR denitrification system of a coal-fired unit. Background technique [0002] Nitrogen oxides (NOx) from coal-fired power generation x ) is one of the main pollutants causing air pollution. Selective non-catalytic reduction denitrification (SNCR) technology, selective catalytic reduction denitrification (SCR) technology and SNCR+SCR hybrid denitrification technology are widely used in numerous flue gas denitrification technologies. Among them, SNCR technology has been widely used in circulating fluidized bed units and W flame units due to its low investment cost and high technical reliability. [0003] Selective non-catalytic reduction denitrification technology is to spray the reducing agent containing amino groups into the area where the temperature of the furnace is 800-1100°C, and the reducing agent will quickly decompose and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/78
CPCB01D53/56B01D53/78B01D2251/2067
Inventor 董陈牛国平舒凯徐晓涛王小成王晓冰常磊潘栋徐宏杰张广才
Owner XIAN THERMAL POWER RES INST CO LTD