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Dry-method desulphurization denitration integrated treatment method

A treatment process, dry desulfurization technology, applied in gas treatment, auxiliary pretreatment, inorganic chemistry, etc., can solve problems such as inability to stimulate catalysts to release electrons and vacancy redox, high temperature, and difficult separation of desulfurization and denitrification products

Inactive Publication Date: 2017-08-15
LIAONING BEIHUAN PURIFICATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidation method for simultaneous desulfurization and denitrification usually uses expensive oxidants, and the desulfurization and denitrification products are difficult to separate, and the use value is not great; while reduction method for simultaneous desulfurization and denitrification process temperature is high, the catalyst price is relatively expensive, and the product is difficult to recycle; self-oxidation and reduction simultaneous desulfurization SO denitrification 2 react with NO to form N 2 and SO 3 It is one of the new technologies at present, but the temperature is still high, the higher the temperature, the better the effect, the minimum should not be lower than 200°C, otherwise the catalyst cannot be stimulated to release electrons and vacancies to play the role of redox

Method used

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Experimental program
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Effect test

Embodiment 1

[0021] Integrated dry desulfurization and denitrification process (see figure 1 ),details as follows.

[0022] Step (1): After the flue gas passes through the dust collector, it is atomized and humidified by the atomizer.

[0023] Step (2), adsorption desulfurization: the humidified flue gas enters the desulfurization device equipped with a foamed adsorption block, after 0.5s, the sulfur dioxide is completely adsorbed.

[0024] Step (3), photocatalysis and decomposition: the flue gas after desulfurization enters the photocatalytic oxidation device to decompose the NOx in the flue gas into N 2 And O 2 , Will produce some O 3 ; There is also part of the NO produced by the photocatalytic process of O 3 Oxidized to NO 2 .

[0025] Step (4), adsorption and denitrification: the flue gas after photocatalytic decomposition is atomized and humidified and then enters the denitrification device equipped with a foamed adsorption block. After the nitrogen dioxide is completely adsorbed by the adso...

Embodiment 2

[0028] The raw materials of the foamed adsorption block are as follows by weight: 65% magnesium oxide, 10% magnesium sulfate, 10% magnesium chloride, 3% phosphoric acid, 10% glass fiber, 0.5% rubber powder, 1.5% hydrogen peroxide.

Embodiment 3

[0030] The raw materials of the foamed adsorption block are as follows by weight: 80% calcium carbonate and 20% high-fine cement.

[0031] 1. After using the foamed adsorption block of Example 1 above to desulfurize and denitrate the flue gas of Dashiqiao Qinghua Group (the inlet and outlet flue gas velocity is 350m 3 / h), the test results are shown in Table 1.

[0032] Table 1. The content of sulfur and nitrogen compounds before and after flue gas treatment.

[0033]

[0034] It can be seen from the table that the dry high-efficiency desulfurization and denitrification process has high desulfurization and denitrification efficiency and meets the standard requirements for air pollutant emission.

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Abstract

The invention belongs to the field of flue gas processing, and especially relates to a dry-method desulphurization denitration integrated treatment method. The dry-method desulphurization denitration integrated treatment method comprises following steps: flue gas is delivered through a deduster for dedusting, and then an atomizer is used for atomization and humidification; after humidification, obtained flue gas is delivered into a desulphurization device containing absorption blocks for 0.5 to 2.5s of treatment so as to achieve complete absorption of SO2; after desulphurization, flue gas is delivered into a photocatalysis oxidation device so as to degrade NOx in flue gas into N2 and O2 and generate a part of O3; a part of NO is converted into NO2 via oxidation with O3 generated via photocatalysis; after photocatalysis decomposition, flue gas is delivered into a denitration device containing absorption blocks, wherein NO2 is absorbed by the absorption blocks completely, and left trace amount of NOx (the concentration of the NOx is 100mg / m<3> or lower), NO2, and O2 are discharged through a chimney. According to the dry-method desulphurization denitration integrated treatment method, low temperature photocatalysis is adopted to reduce waste flue gas treatment cost, and realize high efficiency desulphurization denitration.

Description

Technical field [0001] The invention belongs to the field of flue gas treatment, and particularly relates to a dry desulfurization and denitration integrated treatment process. Background technique [0002] Industrial flue gas is a mixture of gas and soot, which is one of the main causes of air pollution. The composition of the flue gas is very complex, and the gas includes sulfides, carbon compounds and nitrogen oxide compounds; therefore, the pollution of the flue gas to the environment is a compound pollution of multiple poisons. Simultaneous flue gas desulfurization and denitrification is one of the urgent problems in the field of environmental protection. [0003] At present, simultaneous desulfurization and denitration technologies mainly include: (1) Selective catalytic reduction method, which uses a catalytic reducing agent to reduce SO 2 Is elemental sulfur and / or reduces NOx to N 2 After the exhaust gas is absorbed, it reaches the emission standard to realize simultaneou...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01D53/86B01D53/56B01D51/00B01J20/30B01J20/28C04B28/32C04B28/10C04B28/00C04B38/02C04B38/00
CPCB01D53/04B01D51/00B01D53/56B01D53/8625B01D53/8628B01D53/8631B01D2253/10B01D2257/302B01D2258/0283B01D2259/81B01J20/28045C04B28/00C04B28/10C04B28/32C04B22/142C04B22/165C04B14/42C04B24/24C04B22/068C04B38/02C04B22/12C04B14/28C04B38/00
Inventor 李德生
Owner LIAONING BEIHUAN PURIFICATION TECH
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