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Method for denitrifying SNCR flue gas

A denitration and flue gas technology, applied in the field of SNCR flue gas denitration, can solve the problems of increased ammonia escape, adverse effects on efficiency and economy, large consumption of reducing agent, etc., achieving favorable efficiency and economy, and stable denitration efficiency. , the effect of reducing the consumption of reducing agent

Active Publication Date: 2017-01-04
FUJIAN LONGKING
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Problems solved by technology

Therefore, boiler load changes or the original NO X When the initial concentration changes, this will cause the consumption of reducing agent to be too large, which will have an adverse effect on efficiency and economy; or cause the consumption of reducing agent to be too small, resulting in increased ammonia escape or NO X Emission increases, denitrification effect becomes worse

Method used

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  • Method for denitrifying SNCR flue gas
  • Method for denitrifying SNCR flue gas
  • Method for denitrifying SNCR flue gas

Examples

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Embodiment

[0033] In this example, the flue gas denitrification devices of No. 1 and No. 2 combined heat and power generating units are used. No. 1 unit is equipped with a 440t / h circulating fluidized bed boiler (#1 boiler), and No. 2 unit is equipped with a 490t / h circulating fluidized bed boiler (# 2 boiler or 2# boiler); such as figure 1 The shown flue gas denitrification device adopts SNCR process for denitrification. The main design conditions are shown in Table 1, and Table 1 is the denitrification design condition parameters. The field test started on April 27, 2016 and ended on April 29, 2016. The characteristics of the fuel used during the test are shown in Table 2, and Table 2 is the analysis result of the coal quality.

[0034] Table 1 Design condition parameters of denitrification

[0035]

[0036] Table 2 Analysis results of coal quality for combustion

[0037]

[0038]

[0039] 1. If figure 1 As shown, three groups of reducing agent injection points are set on t...

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Abstract

The invention relates to the technical field of flue gas denitrification and provides a method for denitrifying SNCR flue gas. A circulating fluidized bed boiler denitrification system is adopted, the flue gas and a sprayed reducing agent are subjected to a selective non-catalytic reduction reaction, and the treated flue gas is obtained from an outlet of the denitrification system, wherein the spraying amount of the reducing agent is adjusted in real time according to the change of the NOX concentration of the outlet of the denitrification system and the change of the load of a circulating fluidized bed boiler. A control method for the use amount of the reducing agent of the circulating fluidized bed boiler SNCR flue gas denitrification system is optimized, when the load of the circulating fluidized bed boiler changes, denitrification efficiency is stable and good, the consumption of the reducing agent is reduced, the optimal running state of the boiler SNCR denitrification system can be achieved, and the method is beneficial for efficiency and economical efficiency and suitable for large-scale application and popularization.

Description

technical field [0001] The invention relates to the technical field of flue gas denitrification, in particular to a method for denitrification of SNCR flue gas. Background technique [0002] Smoke is a mixture of gas and smoke and is the main cause of air pollution in residential areas. The composition of flue gas is very complex, and the gas in it includes water vapor, SO 2 , N 2 , O 2 , CO, CO 2 , hydrocarbons and nitrogen oxides (NO X )Wait. In flue gas, NO X is NO, NO 2 It is a kind of main air pollutant, which can cause photochemical pollution under the action of strong light with hydrocarbons; NO emitted into the atmosphere X It is the main cause of acid rain and seriously endangers the ecological environment. In order to prevent and control environmental pollution, flue gas denitrification is to remove the generated NO X Revert to N 2 , so as to remove NO from the flue gas X , which has always been a matter of great concern to people. [0003] Circulating...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
CPCB01D53/56B01D53/78B01D2251/206B01D2258/0283
Inventor 林琳
Owner FUJIAN LONGKING
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