Method for purifying flue gas by application of active coke

A technology for activated coke and flue gas, applied in the field of flue gas purification, can solve the problems of slow reaction speed, low denitration efficiency, and large moving bed device.

Active Publication Date: 2008-04-02
CHINA SHENHUA ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method in NH 3 or H 2 Under the action of a mixed reducing agent with CO, it has high denitrification performance, which solves the problems of slow reaction speed and low denitrification efficiency in flue gas desulfurization and denitrification, and is mainly used for flue gas desulfurization and denitrification; however, the technology used The moving bed device is generally relatively large, and the equipment investment is high. In addition, the broken activated coke produced in the process of desulfurization and denitrification is generally processed by incineration, and the utilization rate is not high, which makes the operating cost relatively high.

Method used

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  • Method for purifying flue gas by application of active coke

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Effect test

Embodiment 1

[0015] Embodiment 1, flue gas purification desulfurization, denitrification, demercury

[0016] 1. The flue gas is purified by active coke moving bed reactor

[0017] Sulfur and nitrate in flue gas were removed by using two-stage moving bed reactor produced by Nanjing Electric Power Automation Equipment General Factory. SO in flue gas 2 The concentration is 5000mg / m 3 , NO X The concentration is 500mg / m 3 , Hg content is 20ug / m 3 , the temperature is 120°C, and the space velocity of the moving bed reactor is 1000h -1 . deSO x / off NO X The first section of the reactor is added with 150 kg of active coke; the added NH 3 The concentration of reducing agent mixed with CO is 500 mg / m 3 (NH 3 / CO molar ratio is 20), the temperature is 10-100°C, and the intake flow rate is 500m 3 / h. The activated coke after the second desulfurization reaction is recovered and sent to the regeneration tower, heated at 200-600u℃ for 3-30h for regeneration, and the CO gas generated durin...

Embodiment 2

[0023] Embodiment 2, flue gas purification desulfurization, denitrification, demercury

[0024] 1. The flue gas is purified by pipe spraying active coke

[0025] flue gas SO 2 The content is 3000mg / m 3 , NO X The concentration is 300mg / m 3 , Hg content is 10ug / m 3 , the temperature of the flue gas is 120°C, and the flue gas is passed into the pipeline jet cleaner as in Example 1, with 380mg active coke powder / m 3 The injection volume of flue gas injects active coke into the duct. Among them, the initial active coke powder used can be new active coke, and the subsequent process can use broken active coke generated in the moving bed.

[0026] 2. The flue gas is purified by active coke moving bed reactor

[0027] Gained flue gas of last step is passed in the moving bed reactor as embodiment 1, and wherein, moving bed space velocity is 800h -1 , adding the NH 3 The concentration of the reducing agent mixed with CO is 300PPm (NH 3 / CO mol ratio is 5), all the other proces...

Embodiment 3

[0029] Embodiment 3, flue gas purification desulfurization, denitrification, demercury

[0030] flue gas SO 2 The content is 7500 mg / m 3 , NO X The concentration is 600 mg / m 3 , Hg content is 25ug / m 3 , the flue gas temperature is 180°C, and the flue gas purification is carried out continuously according to step 1 and step 2 of Example 1, wherein the space velocity of the moving bed is 900h -1 , adding H 2 The concentration of reducing agent mixed with CO is 600mg / m 3 (H 2 / CO molar ratio is 0.5), the injection volume of active coke pipeline is 50mg / m 3 . The whole process SO 2 The removal rate is 90%, NO X The removal rate is 75%, and the Hg removal rate is 80%.

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Abstract

The invention discloses a method for using active carbon to purify the smoke, relating to the smoke purification method. The inventive method comprises that the denitration-desulfurization reactor formed by two sections of moving bed reactor can purify the passed smoke, while said smoke be purified when it passes the channel which can spray the active carbon. The invention can remove the heavy metal pollutions of SO2, NOX and Hg at one time; therefore, it has the advantages of high smoke purification efficiency, and lower program investment while it avoids the consumption of water in the purification process. The invention has wider application prospect.

Description

technical field [0001] The invention relates to a flue gas purification method, in particular to a method for purifying flue gas using active coke. Background technique [0002] The development of clean coal technology is one of the sustainable development strategies. Air pollution in my country is mainly caused by coal burning, and the produced NO x with SO 2 It can cause acid rain hazards; and the environmental pollution caused by heavy metals such as mercury, lead, and chromium in coal after burning has been widely concerned by people. Taking mercury as an example, mercury usually exists in the form of cinnabar and free mercury in coal. It is harmful to humans and animals if it volatilizes into the flue gas during combustion. [0003] At present, most foreign flue gas purification adopts wet technology, but the promotion and application of wet flue gas purification technology in power plants in some areas of China is limited. Activated coke flue gas purification techn...

Claims

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Application Information

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IPC IPC(8): B01D53/83
Inventor 张文辉王岭李书荣刘春兰
Owner CHINA SHENHUA ENERGY CO LTD
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