CN104258700A - Circulating fluidized bed boiler desulfurization and denitrification system - Google Patents

Circulating fluidized bed boiler desulfurization and denitrification system Download PDF

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Publication number
CN104258700A
CN104258700A CN201410487170.7A CN201410487170A CN104258700A CN 104258700 A CN104258700 A CN 104258700A CN 201410487170 A CN201410487170 A CN 201410487170A CN 104258700 A CN104258700 A CN 104258700A
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CN
China
Prior art keywords
communicated
ammonia
ammoniacal liquor
outlet
bed boiler
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CN201410487170.7A
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Chinese (zh)
Inventor
高洪培
肖平
王海涛
时正海
蒋敏华
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中国华能集团清洁能源技术研究院有限公司
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Priority to CN201410487170.7A priority Critical patent/CN104258700A/en
Publication of CN104258700A publication Critical patent/CN104258700A/en

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Abstract

The invention discloses a circulating fluidized bed boiler desulfurization and denitrification system which comprises a circulating fluidized bed boiler, a coal supply system, a slag removal system, a dust removal system, an induced air system, an ammonia process desulfurization system, a flue gas follow-up treatment system and an ammonium sulfate treatment system and also comprises an ammonia water preparation and storage system, wherein the coal supply system is communicated with the circulating fluidized bed boiler by a pipeline; the slag removal system is communicated with a slag outlet of the circulating fluidized bed boiler; the dust removal system is communicated with a flue gas outlet of the circulating fluidized bed boiler; the induced air system is communicated with a flue gas outlet of the dust removal system; the ammonia process desulfurization system is communicated with a flue gas outlet of the induced air system; the flue gas follow-up treatment system is communicated with a flue gas outlet of the ammonia process desulfurization system; the ammonium sulfate treatment system is communicated with an ammonium sulfate outlet of the ammonia process desulfurization system; the ammonia water preparation and storage system is communicated with the ammonia process desulfurization system and an SNCR denitration system through an ammonia water outlet; and the SNCR denitration system is communicated with the circulating fluidized bed boiler through the ammonia water outlet. The increasingly strict environmental protection standard is met according to ammonia process desulfurization and SNCR denitration processes, and sulfur dioxide and nitric oxide in flue gas reach the standard and then are emitted.

Description

A kind of circulating fluid bed boiler desulfurization denitrating system

Technical field

The present invention relates to the desulphurization denitration technical field of boiler green technology, be specifically related to a kind of circulating fluid bed boiler desulfurization denitrating system.

Background technology

Require according to new " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011): new-built unit SO 2concentration of emission performs 100mg/m 3limit value; Be positioned at Guangxi province, Chongqing province, Sichuan Province, Guizhou Province's thermal power generation boiler execution 200mg/m 3limit value.Existing boiler SO 2concentration of emission performs 200mg/m 3limit value; Be positioned at Guangxi province, Chongqing province, Sichuan Province, Guizhou Province's thermal power generation boiler execution 400mg/m 3limit value.

Newly-built fired power generating unit NO xconcentration of emission performs 100mg/Nm 3limit value; Active service W flame stove, recirculating fluidized bed (CFB) unit NO xconcentration of emission performs 200m x/ m 3limit value.

New standard has increased substantially atmosphere pollutants emission standards, and it is promulgated and enforcement forces existing CFB unit and newly-built CFB unit to adopt more reliable desulfurizing and denitrifying process to realize qualified discharge.

Existing CFB boiler and newly-built CFB boiler controller system desulfur technology comprise, dry desulfurizing process, Gypsum Wet (WFGD) sulfur removal technology in stove, circulating fluid bed semi-drying method (CFB-FGD) sulfur removal technology.Denitration mode comprises the three types of technology such as low NOx combustion in stove, the SNCR denitrating flue gas (being called for short SNCR) of burner hearth injection reduction agent and the selective catalytic reduction flue gas denitration (being called for short SCR) of stove rear pass injection reduction agent.

Do not take into account and consider that desulphurization denitration is when removing simultaneously, select the higher desulphurization system of some efficiency respectively, denitrating system will exist system complex, the problem such as to take up an area greatly, invest and operating cost is high.How according to the system for desulfuration and denitration of the feature selection technique good economy performance of existing CFB unit, for reduction system for desulfuration and denitration cost, reduce post facility operating cost, ensure environment protection standard important in inhibiting.

Summary of the invention

In order to overcome above-mentioned prior art Problems existing, the object of the present invention is to provide a kind of circulating fluid bed boiler desulfurization denitrating system, by adopting the ammonia process of desulfurization and SNCR denitration technique to meet increasingly strict environmental protection standard, realize SO 2 from fume and nitrogen oxide qualified discharge.

To achieve these goals, the present invention is by the following technical solutions:

A kind of circulating fluid bed boiler desulfurization denitrating system, comprise CFBB 1, with the coal supply system 2 of CFBB 1 by pipeline communication, with the dreg removing system 3 that the slag delivery outlet of CFBB 1 is communicated with, the dust pelletizing system 4 be communicated with the exhanst gas outlet of CFBB 1, the induced draught system 5 be communicated with the exhanst gas outlet of dust pelletizing system 4, the ammonia method desulfurizing system 8 be communicated with the exhanst gas outlet of induced draught system 5, the flue gas aftertreatment systems 10 be communicated with the exhanst gas outlet of ammonia method desulfurizing system 8, with the sulphur ammonium treatment system 9 of the sulphur ammonium outlet of ammonia method desulfurizing system 8, also comprise ammoniacal liquor and prepare storage system 6, ammoniacal liquor is prepared storage system 6 and is communicated with SNCR denitration system 7 with ammonia method desulfurizing system 8 by ammoniacal liquor outlet, SNCR denitration system 7 is communicated with CFBB 1 by ammoniacal liquor outlet.

Described ammoniacal liquor is prepared ammoniacal liquor in storage system 6 and is entered in the flue gas of CFBB 1 as desulfurizing agent and denitrification reducing agent simultaneously.

Escape ammonia in CFBB 1 flue gas of SNCR denitration is entered in ammonia method desulfurizing system 8 by flue as desulfurizing agent.

Described ammoniacal liquor prepares the storage system that storage system 6 comprises the storage system of ammoniacal liquor and the preparation system of ammoniacal liquor or only includes ammoniacal liquor, does not comprise the preparation system of ammoniacal liquor.

The present invention adopts SNCR denitration and the ammonia process of desulfurization to combine and removes SO in CFBB flue gas 2and NO xafter have occupation of land less, reduced investment, the advantages such as desulfuration efficiency is high.Compared to the prior art comparatively, tool of the present invention has the following advantages:

1) denitrating system cost is low.This process makes full use CFB boiler NO xthe feature that concentration of emission is low, achieves and adopts separately SNCR denitration technology to reach in existing " fossil-fuel power plant atmospheric pollutant emission standard " NO xconcentration limit (100mg/m 3) requirement, avoid and adopt the higher SCR denitration mode of cost, significantly reduce denitrating system construction cost.

2) desulfuration efficiency is high.This system takes full advantage of the feature that the ammonia process of desulfurization has higher desulfuration efficiency (>99%), can meet increasingly strict SO 2discharge standard.

3) escape ammonia of denitrating system can be used as desulfurization and recycling.This technique can make full use of unreacted escape ammonia in SNCR denitration process.Escape ammonia enters ammonia desulfurizing process system as desulfurizing agent, reduces the consumption of desulfurizing agent.

4) take up an area less, initial cost is lower.Because in the desulfurizing agent in desulphurization system and denitrating system, reducing agent is ammoniacal liquor, system only needs to advise building a Ge An district separately, desulphurization denitration needs can be met simultaneously, avoid adopt different desulfurizing agent and denitrification reducing agent and need repeated construction desulfurizing agent and and denitrification reducing agent storage equipment, have and take up an area less, cost of investment is low.

5) comprehensive utilization of resources is achieved.Actually relative to the by-produced gypsum of current desulfurization by lime gypsum method system cannot recycle, native system byproduct ammonium sulfate directly can be used as chemical fertilizer, really achieves comprehensive utilization of resources.

Accompanying drawing explanation

Accompanying drawing is the structural representation of embodiments of the invention 1.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention will be described in more detail.

As shown in drawings, a kind of circulating fluid bed boiler desulfurization denitrating system of the present invention, comprise CFBB 1, with the coal supply system 2 of CFBB 1 by pipeline communication, with the dreg removing system 3 that the slag delivery outlet of CFBB 1 is communicated with, the dust pelletizing system 4 be communicated with the exhanst gas outlet of CFBB 1, the induced draught system 5 be communicated with the exhanst gas outlet of dust pelletizing system 4, the ammonia method desulfurizing system 8 be communicated with the exhanst gas outlet of induced draught system 5, the flue gas aftertreatment systems 10 be communicated with the exhanst gas outlet of ammonia method desulfurizing system 8, with the sulphur ammonium treatment system 9 of the sulphur ammonium outlet of ammonia method desulfurizing system 8, also comprise ammoniacal liquor and prepare storage system 6, ammoniacal liquor is prepared storage system 6 and is communicated with SNCR denitration system 7 with ammonia method desulfurizing system 8 by ammoniacal liquor outlet, SNCR denitration system 7 is communicated with CFBB 1 by ammoniacal liquor outlet.

As the preferred embodiments of the present invention, described ammoniacal liquor is prepared ammoniacal liquor in storage system 6 and is entered in the flue gas of CFBB 1 as desulfurizing agent and denitrification reducing agent simultaneously.

As the preferred embodiments of the present invention, the escape ammonia in CFBB 1 flue gas of SNCR denitration is entered in ammonia method desulfurizing system 8 by flue as desulfurizing agent.

As the preferred embodiments of the present invention, described ammoniacal liquor prepares the storage system that storage system 6 comprises the storage system of ammoniacal liquor and the preparation system of ammoniacal liquor or only includes ammoniacal liquor, does not comprise the preparation system of ammoniacal liquor.

The reducing agent of SNCR denitration system of the present invention can adopt ammoniacal liquor and urea, and its reaction principle is as follows:

NH 3for reducing agent 4NH 3+ 4NO+O 2→ 4N 2+ 6H 2o

Urea is reducing agent NO+CO (NH 2) 2+ 1/2O 2→ 2N 2+ CO 2+ H 2o

Because actual industrial process denitrification reducing agent needs are excessive, make to there is a certain amount of escape NH3 at flue gas.The present invention is abundant utilizes the escape ammonia of this part as the desulfurizing agent of follow-up desulphurization reaction system.

The main process of desulphurization reaction is as follows: boiler smoke is through being cooled to saturation temperature to enter scrubbing tower from the bottom of desulfurizing tower.Saturated flue gas is driven in the wrong direction with the cleaning solution sprayed from top to bottom in scrubbing tower, and in desulfurizing tower, liquid, gas carry out violent haptoreaction, SO 2substantially be completely absorbed.

The main chemical reactions of desulphurization reaction is as follows:

SO 2+2NH 4OH (NH 4) 2SO 3+H 2O

SO 2+(NH 4) 2SO 3+H 2O 2NH 4HSO 3

NH 4HSO 3+NH 3 (NH 4) 2SO 3

NH 4) 2SO 3+SO 3 (NH 4) 2SO 4+SO 2

2(NH 4) 2SO 3+O 2 2(NH 4) 2SO 4

Claims (4)

1. a circulating fluid bed boiler desulfurization denitrating system, it is characterized in that: comprise CFBB (1), with the coal supply system (2) of CFBB (1) by pipeline communication, the dreg removing system (3) be communicated with the slag delivery outlet of CFBB (1), the dust pelletizing system (4) be communicated with the exhanst gas outlet of CFBB (1), the induced draught system (5) be communicated with the exhanst gas outlet of dust pelletizing system (4), the ammonia method desulfurizing system (8) be communicated with the exhanst gas outlet of induced draught system (5), the flue gas aftertreatment systems (10) be communicated with the exhanst gas outlet of ammonia method desulfurizing system (8), with the sulphur ammonium treatment system (9) of the sulphur ammonium outlet of ammonia method desulfurizing system (8), also comprise ammoniacal liquor and prepare storage system (6), ammoniacal liquor is prepared storage system (6) and is communicated with SNCR denitration system (7) with ammonia method desulfurizing system (8) by ammoniacal liquor outlet, SNCR denitration system (7) is communicated with CFBB (1) by ammoniacal liquor outlet.
2. a kind of circulating fluid bed boiler desulfurization denitrating system according to claim 1, is characterized in that: described ammoniacal liquor is prepared ammoniacal liquor in storage system (6) and entered in the flue gas of CFBB (1) as desulfurizing agent and denitrification reducing agent simultaneously.
3. a kind of circulating fluid bed boiler desulfurization denitrating system according to claim 1, is characterized in that: the escape ammonia in CFBB (1) flue gas of SNCR denitration is entered in ammonia method desulfurizing system (8) by flue as desulfurizing agent.
4. a kind of circulating fluid bed boiler desulfurization denitrating system according to claim 1, it is characterized in that: described ammoniacal liquor prepares the storage system that storage system (6) comprises the storage system of ammoniacal liquor and the preparation system of ammoniacal liquor or only includes ammoniacal liquor, does not comprise the preparation system of ammoniacal liquor.
CN201410487170.7A 2014-09-22 2014-09-22 Circulating fluidized bed boiler desulfurization and denitrification system CN104258700A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104923050A (en) * 2015-05-21 2015-09-23 武汉加权科技有限公司 Desulfurization and denitrification integrated equipment for power plant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1132107A (en) * 1994-11-04 1996-10-02 巴布考克及威尔考克斯公司 Ammonia reagent application for NOx, SOx and particulate emission control
CN101422691A (en) * 2008-11-20 2009-05-06 武汉凯迪电力环保有限公司 Multi-pollutant removing technique and device of fuel coal smoke
KR101126840B1 (en) * 2008-02-28 2012-03-27 미츠비시 쥬고교 가부시키가이샤 Process and equipment for the treatment of exhaust gas
CN202355981U (en) * 2011-12-06 2012-08-01 北京龙腾华创环境能源技术有限公司 Integrated removal device for pollutants discharged from coal combustion
CN204147752U (en) * 2014-09-22 2015-02-11 中国华能集团清洁能源技术研究院有限公司 A kind of CFBB Novel desulphurization denitrating system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1132107A (en) * 1994-11-04 1996-10-02 巴布考克及威尔考克斯公司 Ammonia reagent application for NOx, SOx and particulate emission control
KR101126840B1 (en) * 2008-02-28 2012-03-27 미츠비시 쥬고교 가부시키가이샤 Process and equipment for the treatment of exhaust gas
CN101422691A (en) * 2008-11-20 2009-05-06 武汉凯迪电力环保有限公司 Multi-pollutant removing technique and device of fuel coal smoke
CN202355981U (en) * 2011-12-06 2012-08-01 北京龙腾华创环境能源技术有限公司 Integrated removal device for pollutants discharged from coal combustion
CN204147752U (en) * 2014-09-22 2015-02-11 中国华能集团清洁能源技术研究院有限公司 A kind of CFBB Novel desulphurization denitrating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104923050A (en) * 2015-05-21 2015-09-23 武汉加权科技有限公司 Desulfurization and denitrification integrated equipment for power plant

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