CN112619409A - Flue gas denitration method - Google Patents

Flue gas denitration method Download PDF

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Publication number
CN112619409A
CN112619409A CN202011283664.5A CN202011283664A CN112619409A CN 112619409 A CN112619409 A CN 112619409A CN 202011283664 A CN202011283664 A CN 202011283664A CN 112619409 A CN112619409 A CN 112619409A
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CN
China
Prior art keywords
flue gas
denitration
dust
reducing agent
enters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
CN202011283664.5A
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Chinese (zh)
Inventor
田晓亮
田永军
�田�浩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tianjin Haochuang Energy Saving Equipment Co ltd
Original Assignee
Tianjin Haochuang Energy Saving Equipment Co ltd
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Publication date
Application filed by Tianjin Haochuang Energy Saving Equipment Co ltd filed Critical Tianjin Haochuang Energy Saving Equipment Co ltd
Priority to CN202011283664.5A priority Critical patent/CN112619409A/en
Publication of CN112619409A publication Critical patent/CN112619409A/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D49/00Separating dispersed particles from gases, air or vapours by other methods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/46Removing components of defined structure
    • B01D53/48Sulfur compounds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2062Ammonia
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/206Ammonium compounds
    • B01D2251/2067Urea
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2251/00Reactants
    • B01D2251/20Reductants
    • B01D2251/21Organic compounds not provided for in groups B01D2251/206 or B01D2251/208

Abstract

The invention relates to a flue gas denitration method, which comprises the following steps: (1) pre-dedusting: the flue gas is discharged through a smoke discharge pipeline and then directly enters a dust remover to remove most of dust; (2) and (3) desulfurization: the flue gas after primary dust removal enters a desulfurizing tower for desulfurization treatment; (3) denitration: the flue gas after desulfurization A enters a denitration tower, is dispersed by a guide plate and then enters a denitration chamber; b, spraying a reducing agent into the denitration chamber through a spray gun; c, fully mixing the flue gas and the reducing agent by adopting a disturbance mechanism; d, enabling the uniformly mixed flue gas and the reducing agent to enter a catalyst layer, starting reaction under the catalysis of the catalyst at a corresponding temperature, and denitrifying the flue gas; (4) and (3) dedusting again: and (4) discharging the denitrated gas from a gas outlet of the denitration tower, directly entering a dust remover, secondarily removing dust, and directly discharging the dust removed gas into the atmosphere. The invention has good flue gas dedusting effect, full contact between the flue gas and the reducing agent, good denitration effect and environmental pollution avoidance.

Description

Flue gas denitration method
Technical Field
The invention relates to the field of flue gas treatment, in particular to a flue gas denitration method.
Background
Nitrogen oxides are one of the main pollution sources causing atmospheric pollution. 70% of the discharge amount of nitrogen oxides in China comes from the direct combustion of coal, and the electric power industry is a big coal-fired household in China, so that a thermal power plant becomes one of main nitrogen oxide pollution sources. With the further improvement of environmental protection standards, denitration projects are carried out on large scale in large and medium-sized thermal power plants in China, and denitration becomes one of key subsidized directions of the thirteen-five energy-saving and environment-friendly industry. The flue gas is generally subjected to one-time dust removal treatment during denitration treatment, the flue gas is not fully contacted with a reducing agent, and the dust removal and denitration effects are general.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a flue gas denitration method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a flue gas denitration method comprises the following steps:
(1) pre-dedusting:
the flue gas is discharged through a smoke discharge pipeline and then directly enters a dust remover to remove most of dust;
(2) and (3) desulfurization:
the flue gas after primary dust removal enters a desulfurizing tower for desulfurization treatment;
(3) denitration:
the flue gas after desulfurization A enters a denitration tower, is dispersed by a guide plate and then enters a denitration chamber;
b, spraying a reducing agent into the denitration chamber through a spray gun;
c, fully mixing the flue gas and the reducing agent by adopting a disturbance mechanism;
d, enabling the uniformly mixed flue gas and the reducing agent to enter a catalyst layer, starting reaction under the catalysis of the catalyst at a corresponding temperature, and denitrifying the flue gas;
(4) and (3) dedusting again:
and (4) discharging the denitrated gas from a gas outlet of the denitration tower, directly entering a dust remover, secondarily removing dust, and directly discharging the dust removed gas into the atmosphere.
Particularly, the dust content of the flue gas subjected to pre-dedusting in the step (1) is 4-8%.
Particularly, the flue gas desulfurization efficiency in the step (2) is more than 95%.
Particularly, the flue gas in the step A is uniformly mixed with the preheated oxygen before entering the denitration chamber.
In particular, the reducing agent in the step B is one of formaldehyde, propylene, ammonia and urea.
In particular, the disturbing mechanism in the step C is a stirring shaft with stirring blades, and the stirring shaft is driven by a motor.
In particular, the catalyst layer in the step D is of a honeycomb structure.
In particular, the reaction temperature in the step D is 300-420 ℃.
The invention has the beneficial effects that: the invention has good flue gas dedusting effect, full contact between the flue gas and the reducing agent, good denitration effect and environmental pollution avoidance.
Detailed Description
The invention is further illustrated by the following examples:
example 1
A flue gas denitration method comprises the following steps:
(1) pre-dedusting:
the flue gas is discharged through a smoke discharge pipeline and then directly enters a dust remover to remove most of dust;
(2) and (3) desulfurization:
the flue gas after primary dust removal enters a desulfurizing tower for desulfurization treatment;
(3) denitration:
the flue gas after desulfurization A enters a denitration tower, is dispersed by a guide plate and then enters a denitration chamber;
b, spraying a reducing agent into the denitration chamber through a spray gun;
c, fully mixing the flue gas and the reducing agent by adopting a disturbance mechanism;
d, enabling the uniformly mixed flue gas and the reducing agent to enter a catalyst layer, starting reaction under the catalysis of the catalyst at a corresponding temperature, and denitrifying the flue gas;
(4) and (3) dedusting again:
and (4) discharging the denitrated gas from a gas outlet of the denitration tower, directly entering a dust remover, secondarily removing dust, and directly discharging the dust removed gas into the atmosphere.
Particularly, the dust content of the flue gas subjected to pre-dedusting in the step (1) is 4%.
Particularly, the flue gas desulfurization efficiency in the step (2) is more than 95%.
Particularly, the flue gas in the step A is uniformly mixed with the preheated oxygen before entering the denitration chamber.
In particular, the reducing agent in step B is ammonia.
In particular, the disturbing mechanism in the step C is a stirring shaft with stirring blades, and the stirring shaft is driven by a motor.
In particular, the catalyst layer in the step D is of a honeycomb structure.
In particular, the reaction temperature in step D is 300 ℃.
Example 2
A flue gas denitration method comprises the following steps:
(1) pre-dedusting:
the flue gas is discharged through a smoke discharge pipeline and then directly enters a dust remover to remove most of dust;
(2) and (3) desulfurization:
the flue gas after primary dust removal enters a desulfurizing tower for desulfurization treatment;
(3) denitration:
the flue gas after desulfurization A enters a denitration tower, is dispersed by a guide plate and then enters a denitration chamber;
b, spraying a reducing agent into the denitration chamber through a spray gun;
c, fully mixing the flue gas and the reducing agent by adopting a disturbance mechanism;
d, enabling the uniformly mixed flue gas and the reducing agent to enter a catalyst layer, starting reaction under the catalysis of the catalyst at a corresponding temperature, and denitrifying the flue gas;
(4) and (3) dedusting again:
and (4) discharging the denitrated gas from a gas outlet of the denitration tower, directly entering a dust remover, secondarily removing dust, and directly discharging the dust removed gas into the atmosphere.
Particularly, the dust content of the flue gas subjected to pre-dedusting in the step (1) is 8%.
Particularly, the flue gas desulfurization efficiency in the step (2) is more than 95%.
Particularly, the flue gas in the step A is uniformly mixed with the preheated oxygen before entering the denitration chamber.
In particular, the reducing agent in the step B is urea.
In particular, the disturbing mechanism in the step C is a stirring shaft with stirring blades, and the stirring shaft is driven by a motor.
In particular, the catalyst layer in the step D is of a honeycomb structure.
In particular, the reaction temperature in step D is 420 ℃.
Example 3
A flue gas denitration method comprises the following steps:
(1) pre-dedusting:
the flue gas is discharged through a smoke discharge pipeline and then directly enters a dust remover to remove most of dust;
(2) and (3) desulfurization:
the flue gas after primary dust removal enters a desulfurizing tower for desulfurization treatment;
(3) denitration:
the flue gas after desulfurization A enters a denitration tower, is dispersed by a guide plate and then enters a denitration chamber;
b, spraying a reducing agent into the denitration chamber through a spray gun;
c, fully mixing the flue gas and the reducing agent by adopting a disturbance mechanism;
d, enabling the uniformly mixed flue gas and the reducing agent to enter a catalyst layer, starting reaction under the catalysis of the catalyst at a corresponding temperature, and denitrifying the flue gas;
(4) and (3) dedusting again:
and (4) discharging the denitrated gas from a gas outlet of the denitration tower, directly entering a dust remover, secondarily removing dust, and directly discharging the dust removed gas into the atmosphere.
Particularly, the dust content of the flue gas subjected to pre-dedusting in the step (1) is 6%.
Particularly, the flue gas desulfurization efficiency in the step (2) is more than 95%.
Particularly, the flue gas in the step A is uniformly mixed with the preheated oxygen before entering the denitration chamber.
In particular, the reducing agent in the step B is formaldehyde.
In particular, the disturbing mechanism in the step C is a stirring shaft with stirring blades, and the stirring shaft is driven by a motor.
In particular, the catalyst layer in the step D is of a honeycomb structure.
In particular, the reaction temperature in step D is 360 ℃.
The invention has been described in an illustrative manner, and it is to be understood that the invention is not limited to the specific embodiments described above, but is intended to cover various modifications, which may be made by the methods and technical solutions of the invention, or may be applied to other applications without modification.

Claims (8)

1. A flue gas denitration method is characterized by comprising the following steps:
(1) pre-dedusting:
the flue gas is discharged through a smoke discharge pipeline and then directly enters a dust remover to remove most of dust;
(2) and (3) desulfurization:
the flue gas after primary dust removal enters a desulfurizing tower for desulfurization treatment;
(3) denitration:
the flue gas after desulfurization A enters a denitration tower, is dispersed by a guide plate and then enters a denitration chamber;
b, spraying a reducing agent into the denitration chamber through a spray gun;
c, fully mixing the flue gas and the reducing agent by adopting a disturbance mechanism;
d, enabling the uniformly mixed flue gas and the reducing agent to enter a catalyst layer, starting reaction under the catalysis of the catalyst at a corresponding temperature, and denitrifying the flue gas;
(4) and (3) dedusting again:
and (4) discharging the denitrated gas from a gas outlet of the denitration tower, directly entering a dust remover, secondarily removing dust, and directly discharging the dust removed gas into the atmosphere.
2. The flue gas denitration method according to claim 1, wherein the dust content after flue gas pre-dedusting in the step (1) is 4-8%.
3. The flue gas denitration method according to claim 1, wherein the flue gas desulfurization efficiency in the step (2) is 95% or more.
4. The flue gas denitration method according to claim 1, wherein in the step A, the flue gas is uniformly mixed with the preheated oxygen before entering the denitration chamber.
5. The flue gas denitration method according to claim 1, wherein the reducing agent in the step B is one of formaldehyde, propylene, ammonia and urea.
6. The flue gas denitration method according to claim 1, wherein in the step C, the disturbance mechanism is a stirring shaft with stirring blades, and the stirring shaft is driven by a motor.
7. The flue gas denitration method according to claim 1, wherein the catalyst layer in the step D is of a honeycomb structure.
8. The method as claimed in claim 1, wherein the reaction temperature in step D is 300-420 ℃.
CN202011283664.5A 2020-11-17 2020-11-17 Flue gas denitration method Withdrawn CN112619409A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011283664.5A CN112619409A (en) 2020-11-17 2020-11-17 Flue gas denitration method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011283664.5A CN112619409A (en) 2020-11-17 2020-11-17 Flue gas denitration method

Publications (1)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104324575A (en) * 2014-09-19 2015-02-04 东南大学 Spray absorption type system for simultaneous desulphurization and denitration of sintering flue gas
CN105457467A (en) * 2015-12-31 2016-04-06 安徽省绿巨人环境技术有限公司 Flue gas denitration device and method
CN105771647A (en) * 2016-05-16 2016-07-20 长沙深湘通用机器有限公司 Denitrification reaction device for denitrification
CN207187510U (en) * 2017-08-30 2018-04-06 中国新时代国际工程公司 A kind of vortex mixed SCR denitration device
CN109499366A (en) * 2018-11-26 2019-03-22 天津浩创节能环保设备有限公司 A kind of denitrating flue gas sulfur removal technology with energy-conserving action

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104324575A (en) * 2014-09-19 2015-02-04 东南大学 Spray absorption type system for simultaneous desulphurization and denitration of sintering flue gas
CN105457467A (en) * 2015-12-31 2016-04-06 安徽省绿巨人环境技术有限公司 Flue gas denitration device and method
CN105771647A (en) * 2016-05-16 2016-07-20 长沙深湘通用机器有限公司 Denitrification reaction device for denitrification
CN207187510U (en) * 2017-08-30 2018-04-06 中国新时代国际工程公司 A kind of vortex mixed SCR denitration device
CN109499366A (en) * 2018-11-26 2019-03-22 天津浩创节能环保设备有限公司 A kind of denitrating flue gas sulfur removal technology with energy-conserving action

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
尹华强等: "《绿色火电技术》", 30 November 2019, 上海交通大学出版社 *

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