A method for purifying flue gas by use of powdered activated coke

Abstract

The invention discloses a method for cleaning amoke gas by using powder active coke. The smoke gas containing pollutant passes through gas passage injected with powder active coke for pollutant removal, the powder active coke adsorbed with pollutant is collected by dust cleaner, and the smoke gas is cleaned. The injecting amount of active coke is 50-20000 mg for every m3 smoke gas. The invention is characterized by small device, simple construction, and low investment, desulfuration rate of 50-99%, denitration rate of 20-80% and demercuration rate of larger than 50-95%. The production cost of powder active coke is low, and there is no mechanical consumption in process of removing pollutant, which greatly reduces cost for smoke gas cleaning.

Description

technical field

[0001] The invention relates to a flue gas purification method, in particular to a method for purifying flue gas by using powdered activated coke or activated carbon (hereinafter referred to as powdered activated 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 pow...

Examples

Embodiment 1

[0012] Embodiment 1, flue gas purification desulfurization, denitrification, demercury

[0013] use figure 1 The flue gas pipeline injection purification process shown, the SO in the flue gas 2 The concentration is 1000mg / m 3 , NO X The concentration is 500mg / m 3 , Hg content is 20μg / m 3 , the temperature is 120°C, and the concentration of sprayed active coke is 1000mg / m 3 , powdered active coke particles 500-600μm, iodine value 400mg / g, water content 6%. The whole process SO 2 The removal rate is 90%, NO X The removal rate is 30%, the Hg removal efficiency is 95%, the active coke powder is recycled after regeneration, and the high concentration of SO obtained after regeneration 2 The gas is used to produce sulfuric acid. If powdered activated coke is sprayed into the flue gas, 100-500mg / m 3 NH 3 or CO, NO X The removal rate was 40%.

Embodiment 2

[0014] Embodiment 2, flue gas purification desulfurization, denitrification, demercury

[0015] flue gas SO 2 The content is 3000mg / m 3 , NO X The concentration is 300mg / m 3 , Hg content is 10μg / m 3 , the temperature of the flue gas is 120°C, the flue gas is passed into the flue gas pipeline, and 3800mg active coke powder / m 3 The injection amount of flue gas injects active coke into the pipeline, the powdered active coke particles are 200-400μm, the iodine value is 600mg / g, the water content is 8%, and the added NH 3 The concentration of reducing agent mixed with CO is 600mg / m 3 (NH 3 / CO is 1), the Hg removal rate of the whole process flue gas is 93%, SO 2 The removal rate is 92%, NO X The removal rate was 49%. Activated coke powder is recycled after regeneration, and the high concentration of SO obtained after regeneration 2 The gas is used to produce sulfuric acid.

Embodiment 3

[0016] Embodiment 3, flue gas purification desulfurization, denitrification, demercury

[0017] flue gas SO 2 The content is 7500mg / m 3 , NO X The concentration is 600mg / m 3 , Hg content is 25μg / m 3 , the flue gas temperature is 180°C, the added NH 3 The concentration of reducing agent mixed with CO is 600mg / m 3 (NH 3 / CO is 0.5), the injection volume of active coke pipeline is 5000mg / m 3 , powdered active coke particles 10-80μm, iodine value 800mg / g, water content 15%. The whole process SO 2 The removal rate is 90%, NO X The removal rate is 45%, and the Hg removal rate is 95%. Activated coke powder is recycled after regeneration, and the high concentration of SO obtained after regeneration 2 The gas is used to produce sulfuric acid.

technical field

[0001] The invention relates to a flue gas purification method, in particular to a method for purifying flue gas by using powdered activated coke or activated carbon (hereinafter referred to as powdered activated 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 pow...

Examples

Embodiment 1

[0012] Embodiment 1, flue gas purification desulfurization, denitrification, demercury

[0013] use figure 1 The flue gas pipeline injection purification process shown, the SO in the flue gas 2 The concentration is 1000mg / m 3 , NO X The concentration is 500mg / m 3 , Hg content is 20μg / m 3 , the temperature is 120°C, and the concentration of sprayed active coke is 1000mg / m 3 , powdered active coke particles 500-600μm, iodine value 400mg / g, water content 6%. The whole process SO 2 The removal rate is 90%, NO X The removal rate is 30%, the Hg removal efficiency is 95%, the active coke powder is recycled after regeneration, and the high concentration of SO obtained after regeneration 2 The gas is used to produce sulfuric acid. If powdered activated coke is sprayed into the flue gas, 100-500mg / m 3 NH 3 or CO, NO X The removal rate was 40%.

Embodiment 2

[0014] Embodiment 2, flue gas purification desulfurization, denitrification, demercury

[0015] flue gas SO 2 The content is 3000mg / m 3 , NO X The concentration is 300mg / m 3 , Hg content is 10μg / m 3 , the temperature of the flue gas is 120°C, the flue gas is passed into the flue gas pipeline, and 3800mg active coke powder / m 3 The injection amount of flue gas injects active coke into the pipeline, the powdered active coke particles are 200-400μm, the iodine value is 600mg / g, the water content is 8%, and the added NH 3 The concentration of reducing agent mixed with CO is 600mg / m 3 (NH 3 / CO is 1), the Hg removal rate of the whole process flue gas is 93%, SO 2 The removal rate is 92%, NO X The removal rate was 49%. Activated coke powder is recycled after regeneration, and the high concentration of SO obtained after regeneration 2 The gas is used to produce sulfuric acid.

Embodiment 3

[0016] Embodiment 3, flue gas purification desulfurization, denitrification, demercury

[0017] flue gas SO 2 The content is 7500mg / m 3 , NO X The concentration is 600mg / m 3 , Hg content is 25μg / m 3 , the flue gas temperature is 180°C, the added NH 3 The concentration of reducing agent mixed with CO is 600mg / m 3 (NH 3 / CO is 0.5), the injection volume of active coke pipeline is 5000mg / m 3 , powdered active coke particles 10-80μm, iodine value 800mg / g, water content 15%. The whole process SO 2 The removal rate is 90%, NO X The removal rate is 45%, and the Hg removal rate is 95%. Activated coke powder is recycled after regeneration, and the high concentration of SO obtained after regeneration 2 The gas is used to produce sulfuric acid.

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