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Dry-method fume gas purification method and device for synchronous desulfurization and denitrification

A desulfurization, denitrification, and flue gas purification technology, applied in the field of flue gas purification, can solve problems such as easy failure, unstable additives, and reduced practical value, and achieve the effects of strengthening mass transfer and heat transfer, and simplifying the removal system and process flow.

Active Publication Date: 2010-04-21
FUJIAN LONGKING DSDN ENGINEERING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method of the highly active absorbent used in this method is cumbersome, and it is difficult to solve the problems of raw material transportation, storage, preparation and use of a large amount of absorbent in the process of industrial application; Afterwards, it is easy to fail, which reduces its practical value, and it is difficult to truly realize industrial application

Method used

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  • Dry-method fume gas purification method and device for synchronous desulfurization and denitrification
  • Dry-method fume gas purification method and device for synchronous desulfurization and denitrification

Examples

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Embodiment 1

[0030] A power plant uses the simultaneous desulfurization and denitrification dry flue gas purification device of the present invention for flue gas purification treatment. The generating set capacity is 200MW and the flue gas volume is 1,440,000m 3 / h, raw flue gas SO 2 The concentration is 3100mg / m 3 , raw flue gas NO x The concentration is 1100mg / m 3 , the inlet temperature of raw flue gas is 140℃, using Ca(OH) 2 As an absorbent, Ca / (S+0.5N) is 1.2, that is, the amount of absorbent used is 10.88t / h, and KMnO is selected 4 As an absorbent additive.

[0031] 1. Configure a certain concentration of additive aqueous solution and store it in the process water tank. The amount of additive added is 1% of the absorbent, that is, KMnO 4 The consumption is 0.11t / h.

[0032] 2. The raw flue gas that needs to be purified enters the circulating fluidized bed reaction absorption tower 2 from the inlet flue 1, and is mixed with the absorbent added from the absorbent bin 5 and the r...

Embodiment 2

[0037] In Example 1, a certain power plant uses the simultaneous desulfurization and denitrification dry-process flue gas purification device of the present invention to perform flue gas purification treatment. KMnO 4 The consumption is 0.33t / h. After testing, the outlet net flue gas SO 2 The concentration is about 217mg / m 3 , the desulfurization efficiency reaches 93%; NO x The concentration is about 242mg / m 3 , The denitrification efficiency reaches 78%.

Embodiment 3

[0039] In Embodiments 1 and 2, a certain power plant uses the simultaneous desulfurization and denitrification dry flue gas purification device of the present invention to carry out flue gas purification treatment. 5%, ie KMnO 4 The consumption is 0.55t / h. After testing, the outlet net flue gas SO 2 The concentration is 155mg / m 3 , desulfurization efficiency up to 95%; NO x The concentration is 88mg / m 3 , The denitrification efficiency reaches 92%.

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Abstract

The invention relates to fume purification and provides dry-method fume purification method and device for synchronous desulfurization and denitrification. The purification device is provided with an inlet flue, an absorption tower, a dust collector, a material circulating air chute, an absorbent cabin, a water box, a water pump, an atomization spray gun and an outlet flue. In the invention, an additive water solution is stored in a process water box; a primary fume enters the absorption tower through the inlet flue, mixes with an absorbent added form the absorbent cabin and cycled materials returned from the material circulating air chute, and then performs cooling and moistening reaction with the additive water solution pumped by the high-pressure pump from the water box to the atomization spray gun and sprayed by the atomization spray gun to the absorption tower; the outlet fume of the absorption tower enters the dust collector, incompletely reacted materials in the fume are collected, and the major part of the fume enters a circulating fluidize bed absorption tower with the absorbent added in the absorbent cabin through the material circulating air chute to continue the reaction; circulation continues in the same way; and the fume purification is then achieved when the cleaned fume is exhausted from a chimney from the dust collector through the outlet flue.

Description

technical field [0001] The invention relates to flue gas purification, in particular to a dry flue gas purification method and device capable of realizing simultaneous desulfurization and denitrification. Background technique [0002] SO emitted from coal combustion 2 and NO x is the main cause of air pollution. At present, the combination of FGD (flue gas desulfurization) and SCR (selective catalytic reduction denitrification) is widely used for desulfurization and denitrification. This hierarchical treatment method has high pollutant removal efficiency, but the investment and operation costs are also high. , and the process is complicated, the equipment is various, and the area is huge. [0003] Zhang Ze et al. disclosed a dry flue gas cleaning process and system for simultaneous desulfurization and denitrification in the Chinese invention patent No. ZL 03125332.6. The process uses hydrogen peroxide or methanol as an additive to convert nitric oxide in the flue gas int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/60
Inventor 王建春张志文张原林驰前郑进朗詹威全余华龙
Owner FUJIAN LONGKING DSDN ENGINEERING CO LTD
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