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Simultaneous gas-phase desulfurization and denitration method for smoke gas

A technology for desulfurization, denitrification and flue gas, which is applied in the field of simultaneous gas-phase desulfurization and denitrification of flue gas and gas-phase desulfurization and denitrification of flue gas, which can solve the problems of complex operation, high operation and maintenance costs, and high investment in fixed assets.

Active Publication Date: 2014-04-02
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the existing desulfurization and denitrification technologies, the present invention provides a method for simultaneously gas-phase desulfurization and denitrification of flue gas to realize SO in coal-fired flue gas 2 Simultaneous treatment of NOx and NOx to overcome the problems of high fixed asset investment, high operation and maintenance costs, and complex operation of existing desulfurization and denitrification technologies

Method used

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specific Embodiment approach

[0029] The technical solutions of the present invention will be further described below in conjunction with the examples, but the protection scope of the present invention is not limited thereto.

[0030] The flue gas to be treated described in the embodiment is flue gas from thermal power plant, NO X About 600mg / m 3 , SO 2 About 3000mg / m 3 ; NO in flue gas of thermal power plant X The main component is NO, accounting for about X More than 95% of the total, the rest is NO 2 .

Embodiment 1

[0032] A method for simultaneous gas-phase desulfurization and denitrification of flue gas, comprising the following steps:

[0033] (1) Using air as the carrier gas, inject a mixture of 805.5kg of urea and 78.5kg of ammonium chloride, a compound desulfurization and denitrification agent, into the reaction zone. The desulfurization and denitrification agent and the SO in the flue gas 2 The molar ratio is 0.9:1, and the NO in the flue gas X The molar ratio is 1:1, the total usage is the sum of the two, and the injection pressure is 35kpa;

[0034] (2) Under the condition that the temperature of the reaction zone is 850°C, after 2 seconds of reaction, it is ready;

[0035] SO in flue gas before and after treatment was detected by flue gas analyzer 2 , NO X Concentration, calculated to give SO 2 The removal rate reaches 96.0%, NO X The removal rate is 75.7%.

Embodiment 2

[0037] The method for simultaneous gas-phase desulfurization and denitrification of flue gas as described in Example 1 is different in that: the temperature in the reaction zone is 950°C, and the reaction time is 2s.

[0038] SO in flue gas before and after treatment was detected by flue gas analyzer 2 , NO X Concentration, calculated to give SO 2 The removal rate reaches 98.0%, NO X The removal rate reached 81.5%.

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Abstract

The invention relates to a simultaneous gas-phase desulfurization and denitration method for smoke gas. According to the method, a composite desulfurization and denitration agent is heated and gasified, then is injected into a desulfurization and denitration reaction area, and is in fully mixed reaction with NOx and SO2 in the smoke gas at a certain temperature, so that the aim of simultaneous desulfurization and denitration is achieved, the desulfurization efficiency is greater than 95 percent, and the denitration efficiency is greater than 75 percent. Compared with an existing desulfurization and denitration method, the simultaneous gas-phase desulfurization and denitration method has the advantages that a catalyst is not required; the desulfurization and denitration agent is small in usage; the operation is simple; the operation cost is relatively low; the economic advantages are obvious; the problems of high infrastructure investment, high operation cost, high maintenance cost and complicated operation of an existing simultaneous desulfurization and denitration technology are solved; the method can be applied to treatment on the smoke gas or tail gas of various industrial boilers and industrial kilns.

Description

technical field [0001] The invention relates to a method for simultaneous gas-phase desulfurization and denitrification of flue gas, in particular to a method for utilizing a compound desulfurization and denitrification agent to perform gas-phase desulfurization and denitrification of flue gas, and belongs to the technical field of flue gas purification treatment. technical background [0002] With the development of our country's economy, the environmental pollution caused by a large amount of energy consumption is becoming more and more serious. my country is a country where coal is the main energy source. Harmful substances such as soot, sulfur dioxide, and nitrogen oxides contained in coal-burning flue gas have caused serious air pollution. [0003] There are many types of flue gas desulfurization technologies for domestic coal-fired power plants, such as limestone-gypsum method, simple wet method, wet ammonia method, electron beam method, etc. Selective catalytic reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/81B01D53/60
CPCY02A50/20
Inventor 朱维群王倩王付燕孙洪志袁爱丽
Owner SHANDONG UNIV
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