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Industrial semi-dry SCR flue gas denitration method

A semi-dry method and industrial technology, applied in the field of air pollution control, can solve the problems of secondary pollution, large investment in denitrification, high operating cost, etc., and achieve the effects of small environmental impact, reduced environmental pollution, and reduced management difficulty

Pending Publication Date: 2021-04-30
安徽萃智环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a low-investment, Industrial flue gas semi-dry SCR denitrification system and method with low operating cost, no clogging, no poisoning, and high reliability that can be widely used in thermal power, building materials, chemical and other industries

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  • Industrial semi-dry SCR flue gas denitration method
  • Industrial semi-dry SCR flue gas denitration method
  • Industrial semi-dry SCR flue gas denitration method

Examples

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Effect test

Embodiment 1

[0037] A 700t / d glass furnace with an air volume of 135,000 cubic meters per hour; "electrostatic dust removal + (double) SCR + SDA semi-dry desulfurization + bag filter" has been used for flue gas decontamination, of which the flue gas dust emission is 15mg / h N m 3 , NO X The emission is 165mg / Nm 3 , SO 2 The emission is 195mg / Nm 3 , as the local government requires ultra-low emissions, and at the same time the cost of using SCR (two sets) is high, after adopting the scheme of this embodiment, the average 24-hour dust emission is 4mg / Nm 3 , NO X Emission average 25mg / Nm 3 , to meet ultra-low emission requirements.

[0038] The specific implementation is as follows: In the "electrostatic dust removal + SCR + bag type dust removal" process, it is modified to "electrostatic dust removal + semi-dry SCR denitrification + bag type dust removal", such as figure 1 As shown, the high-temperature SCR facility was canceled, the ammonia injection facility was retained, and the sem...

Embodiment 2

[0040] For a household waste incineration power plant project, the first phase of the project processes 500 tons of waste per day, the second phase of the project processes 300 tons of waste per day, and the first and second phases of the total daily waste processing of 800 tons. Currently, the flue gas treatment adopts "SNCR + semi-dry desulfurization (sodium bicarbonate ) + bag filter + low temperature SCR" treatment process, of which NO X Initial concentration 350mg / Nm 3 , 175mg / Nm after low temperature SCR denitrification 3 , mainly due to the insufficient activity of low-temperature SCR denitrification after a period of use, resulting in poor catalytic denitrification effect. Although it meets the national emission standards, due to strong reactions from surrounding residents, ultra-low emission transformation is carried out. After adopting the scheme of this embodiment, the average value of dust emission in 168 hours is 2mg / Nm 3 , SO 2 Emission average 18mg / Nm 3 , NO...

Embodiment 3

[0043] A thermal power plant with a power generation capacity of 330MW and a flue gas volume of 1.1 million cubic meters per hour currently adopts the treatment of "SNCR + high temperature electric dust collector + high temperature SCR + bag filter + fan + lime gypsum wet desulfurization + heat exchanger + chimney discharge" Process, in which the emission of flue gas and dust is 2mg / Nm 3 , SO 2 The emission is 20mg / Nm 3 , NO X The emission is 35mg / Nm 3 , to meet ultra-low emission requirements, but there are problems such as high operating costs and high-temperature SCR easy to block. After adopting the scheme of this embodiment, the average value of dust emission in 24 hours is 2.5mg / Nm 3 , SO 2 Emission average 9mg / Nm 3 , NO X Emission average 28mg / Nm 3 , to achieve ultra-low emission requirements, while greatly reducing operating costs and reducing labor costs of water and electricity. The specific implementation is as follows:

[0044] Modify the original process...

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Abstract

The invention relates to an industrial semi-dry SCR denitration system and method. A reactor and a spray gun are additionally arranged by utilizing existing facilities of an industrial kiln, and the spray gun is arranged on a smoke exhaust pipeline and connected with the reactor through a pipeline; sulfuric acid / nitrate of transition metal and an alkaline substance or a solution of the sulfuric acid / nitrate and the alkaline substance are added into the reactor manually or through a liquid preparation system, and particles containing oxyhydrogen or carbonic acid compounds are generated through a rapid reaction in a solution environment; liquid containing oxyhydrogen or carbonic acid compound particles is sprayed into the smoke exhaust pipeline through the spray gun, and the liquid is vaporized, decomposed and oxidized at high temperature to generate transition metal oxide and catalytic particles compounded with the transition metal oxide; the catalytic particles and the flue gas are fully mixed, flow along with the flue gas and catalyze the flue gas containing a reducing agent and nitric oxide to be subjected to SCR denitration reaction, and nitrogen and water are generated; and the catalytic particles are collected at the flue gas treatment device. The invention has the characteristics of low investment, low operation cost, no blockage, high reliability and the like.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to an industrial semi-dry SCR denitrification system and method. Background technique [0002] The problem of nitrogen oxide emissions has become one of the main sources of air pollution. In recent years, countries have successively introduced relevant policies, and put forward higher nitrogen oxide emissions for thermal power, steel, cement, non-ferrous metals, petrochemical, chemical, waste incineration and other air pollution source industries. Standard, efficient denitrification has become a major problem that the industry urgently needs to solve. [0003] At present, the main technologies of denitrification are selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR) denitrification technologies. SNCR-selective non-catalytic reduction denitrification technology is a kind of denitrification technology without catalyst. In the temperature range of 850...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8628B01D2258/0283
Inventor 韩建英李灿华王昭然徐向阳肖莹张永柱
Owner 安徽萃智环保科技有限公司