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Flue gas desulfurization and denitration method

A desulfurization, denitrification and flue gas technology, applied in separation methods, chemical instruments and methods, air quality improvement and other directions, can solve the problems of high investment and operation cost, complex process, large amount of reagents, etc., and achieves low investment and operation cost and technological process. Simple, easy-to-use effects

Active Publication Date: 2013-11-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Oxidative absorption is the use of oxidizing agents such as HClO 3 to NOx or simultaneously to SO 2 Oxidation with NOx, and then absorbing with absorption liquid, this method has a high removal rate, but mostly uses strong oxidants, the cost is high, and it is difficult to treat waste liquid or recycle by-products
Catalytic oxidation absorption is the use of catalysts such as activated carbon to convert SO 2 And NOx is oxidized to a high valence state and absorbed by the absorption liquid. The by-products of this method can be recycled, no waste is generated, and the operation is simple, but the treatment volume is small, the land occupation is large, and the catalyst regeneration is difficult.
The complexation absorption method uses iron complexing agent for complexation and desorption to treat flue gas, but the regeneration of complexing agent is difficult, and the secondary wastewater is difficult to treat
The reduction absorption method is a urea and additive method, which reduces NOx to nitrogen and produces ammonium sulfate as a by-product. However, this method has disadvantages such as low removal rate, large amount of reagents, and high cost.
There are also the urea catalyst method and the ethylenediamine cobalt urea method derived from this, using a catalyst to convert SO 2 And NOx is oxidized and then absorbed by urea to obtain by-products ammonium nitrate and ammonium sulfate. Although the removal rate of these technologies is improved and the amount of reagents is reduced, there are difficulties in product recovery and utilization, and the product quality is easily affected after adding additives. Complexity
To sum up, it can be seen that the existing flue gas simultaneous desulfurization and denitrification technology has problems such as high investment and operation costs, small processing capacity, large floor area, complex process, and difficulty in recycling by-products. By-products cannot be well utilized, and more direct Abandoned, resulting in a waste of sulfur dioxide resources

Method used

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  • Flue gas desulfurization and denitration method

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Effect test

Embodiment 1

[0025] First, the generated ozone is injected into the catalytic cracking flue gas pipeline at a flue gas temperature of 100-150°C. The ozone fully contacts and reacts with nitrogen oxides in the flue gas, and the flue gas volume is 50m 3 / h, NO, SO 2 The content is 400mg / m 3 , 2000mg / m 3 , according to the flue gas per cubic meter, the ozone content is 1280mg, and the ozone is passed into the flue gas, and the contact time is 3s. The ozone and NO x The molar ratio of the substances is 2:1, the flue gas is in reverse full contact with the 45°C washing acidic water, absorbs the nitrogen oxides that have been oxidized by ozone, absorbs the remaining while oxidizing, and removes dust and cools down at the same time. The spray volume in the water washing tower is 120kg / h, the NO content in the flue gas from the washing tower is 72mg / m 3 (Converted into NO), the denitrification rate is 82%. After the preliminary treatment, the flue gas enters the sulfur dioxide absorption tower...

Embodiment 2

[0027] First, the generated ozone is injected into the catalytic cracking flue gas pipeline at a flue gas temperature of 100-150°C. The ozone fully contacts and reacts with nitrogen oxides in the flue gas, and the flue gas volume is 50m 3 / h, NO x , SO 2 The content is 550mg / m 3 , 2000mg / m 3 , according to each cubic meter of flue gas, the ozone content is 2640mg, the ozone is passed into the flue gas, the contact time is 5s, the ozone and NO x The molar ratio of the substances is 3:1. Under the condition of adiabatic saturation, the flue gas is fully in reverse contact with the washing acidic water at 60°C to absorb the nitrogen oxides that have been oxidized by ozone, and the residual is absorbed while being oxidized. The amount of internal spraying is 150kg / h, and the NO content in the flue gas from the washing tower is 77mg / m 3 (Converted into NO), the denitrification rate is 86%. After preliminary treatment, the flue gas enters the sulfur dioxide absorption tower and ...

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Abstract

The present invention discloses a flue gas desulfurization and denitration method. The method comprises the following steps that: ozone is introduced to a flue gas pipeline with a temperature of 50-200 DEG C, wherein a molar ratio of the ozone to the NOx is 1-3:1; the flue gas mixture after the reaction enters a water washing tower, and is subjected to counter current contact with water to carry out quenching, wherein a volume ratio of the water to the flue gas is 0.002-0.003:1; the water-washed flue gas enters a SO2 absorption tower, and contacts with an absorption agent, wherein the temperature of the SO2 absorption tower is 40-65 DEG C, the volume ratio of the absorption agent to the flue gas is 0.25-0.5:1000; the absorption agent absorbing the SO2 enters a regeneration tower to carry out regeneration; the regenerated absorption agent is recycled, and the purified flue gas is discharged to atmosphere by a chimney.

Description

Technical field: [0001] The invention relates to the separation of sulfur dioxide and nitrogen oxides in flue gas, in particular to a method for removing sulfur dioxide and nitrogen oxides from flue gas. technical background: [0002] Contains SO 2 , A large amount of emission of NOx exhaust gas has caused serious environmental pollution problems, the current control of SO 2 , NOx and other harmful gas emissions is the flue gas purification treatment. At present, flue gas simultaneous desulfurization and denitrification technologies mainly include oxidation absorption, complexation absorption, and reduction absorption. Oxidation absorption technology uses high-energy activation, oxidant oxidation, and catalytic oxidation to reduce NOx or simultaneously reduce SO 2 And NOx is oxidized to a high-valence state, which is easy to absorb oxides, and then absorbed by absorbents. High-energy activation includes electron beam irradiation and pulsed corona plasma. This method has a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/60B01D47/06
CPCY02A50/20
Inventor 涂先红陈卫红裴旭东郭荣群李朝恒王秀珍张凡
Owner CHINA PETROLEUM & CHEM CORP