CN105944546B - Denitrating system and denitration in the stove technique in circulating fluid bed boiler - Google Patents
Denitrating system and denitration in the stove technique in circulating fluid bed boiler Download PDFInfo
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- CN105944546B CN105944546B CN201610537915.5A CN201610537915A CN105944546B CN 105944546 B CN105944546 B CN 105944546B CN 201610537915 A CN201610537915 A CN 201610537915A CN 105944546 B CN105944546 B CN 105944546B
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- boiler
- urea
- denitration
- dosing chamber
- delivery pump
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000012530 fluid Substances 0.000 title claims abstract description 15
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000004202 carbamide Substances 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 9
- 239000003546 flue gas Substances 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 4
- 239000008399 tap water Substances 0.000 claims abstract description 4
- 235000020679 tap water Nutrition 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 18
- 229910021529 ammonia Inorganic materials 0.000 claims description 9
- 238000010531 catalytic reduction reaction Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 4
- 238000007865 diluting Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000009466 transformation Effects 0.000 abstract description 6
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 5
- 239000000908 ammonium hydroxide Substances 0.000 description 5
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009967 tasteless effect Effects 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
Abstract
The present invention relates to circulating fluidized bed boiler denitration technology field, it is specifically related to denitrating system and denitration in the stove technique in a kind of circulating fluid bed boiler.Denitrating system in circulating fluid bed boiler, urea feed bin, measuring chute, dosing chamber, delivery pump, urea liquid storage tank, mixer including boiler and sequential connection etc., steam inlet tube is connected to dosing chamber, injector respectively, and tap water inlet pipe is connected to the outlet end of dosing chamber, mixer and the first delivery pump respectively.Be to utilize urea as reducing agent in 850~1050 DEG C of temperature region in fire box temperature, in the case where no catalyst selectively with the nitrogen oxides NO in inner flue gas of the stovexIt chemically reacts, generates harmless nitrogen and water, to remove NO in flue gasx.The present invention is suitble to the depth denitration technology of CFB boiler transformation, has many advantages, such as that technological investment and operating cost are low, install and transformation is easy, and do not need setting catalyst, and meet newest environmental protection standard.
Description
Technical field
The present invention relates to circulating fluidized bed boiler denitration technology field, it is specifically related in a kind of circulating fluid bed boiler
Denitrating system and denitration in the stove technique.
Background technique
Recirculating fluidized bed (CFB) boiler has the advantages that pollutant emission controls that at low cost, fuel tolerance is wide, nearly 30
It is rapidly developed within the scope of the world and China over year.But it is unstable etc. by coal quality variation, the bad and equipment of operation control
Factor influences, and the environmental protection characteristic of CFB boiler fails to give full play to.The combustion product of CFB boiler is arranged in the appearance of new environmental protection standard
It puts and proposes requirements at the higher level, the existing part CFB boiler unit SO in China2And NOxDischarge amount is not able to satisfy newest environmental protection standard
It is required that the NO of part of generating unitsxDischarge amount is more than 200mg/Nm3, some practitioners also hold the prudent attitude to its future development.
Popular flue-gas denitration process method in the world at present, main selective catalytic reduction method (SCR), selection
Property noncatalytic reduction (SNCR).For SCR denitration efficiency up to 60~90%, SNCR denitration efficiency general range is 30~60%
(for small-scale circulating fluidized bed boiler denitration efficiency up to 70%)；But SCR investment operating cost it is larger, SNCR investment and
Operating cost is relatively low, and SNCR hardly increases system resistance.Since CFB boiler itself NOx emission concentration is low, close
Reason improves selective non-catalytic reduction method (SNCR) denitration, can still meet newest environmental protection standard, and technological investment and operating cost
It is low, install and be transformed relatively simple.
Summary of the invention
For the technical problems in the prior art, the purpose of the present invention is to provide a kind of circulating fluid bed boilers
Interior denitrating system and denitration in the stove technique.It has many advantages, such as that technological investment and operating cost are low, install and transformation is easy, and not
It needs that catalyst is arranged.Although denitration efficiency can still meet most lower than SCR since CFB boiler itself NOx emission concentration is low
New environmental protection standard.
To achieve the goals above, the technical scheme adopted by the invention is as follows: denitration in a kind of circulating fluid bed boiler
System, it is urea feed bin, measuring chute, dosing chamber, the first delivery pump, urea liquid storage tank including boiler and sequential connection, mixed
Clutch, the second delivery pump, injector, steam inlet tube are connected to dosing chamber, injector respectively, tap water inlet pipe respectively with ingredient
The outlet end in pond, mixer and the first delivery pump is connected to.
Denitrating technique in a kind of circulating fluid bed boiler, in the temperature region that fire box temperature is 850~1050 DEG C, benefit
Use urea as reducing agent, in the case where no catalyst selectively with the nitrogen oxides NO in inner flue gas of the stovex(mainly
About 95%NO and 5%NO2) chemically react, harmless nitrogen and water are generated, to remove NO in flue gasx；First delivery pump
The urea liquid that completion is prepared in dosing chamber is delivered in urea liquid storage tank, by the urea liquid of mixer mixed diluting
It is injected by several injectors and under vapor action in boiler to form several jetted layers, sprays into the urea of burner hearth
The mass concentration of solution is 25~28%, and then realizes selective non-catalytic reduction method denitration in the stove.
At present there are three types of the common reducing agents of SNCR denitration: urea, ammonium hydroxide, liquefied ammonia, if reducing agent uses liquefied ammonia, advantage
It is that denitrating system tank volume can be smaller, reducing agent price is also generally the least expensive；The disadvantage is that ammonia is toxic, inflammable, explosive, storage
Security protection requires height, and needing to examine through related fire fighting safety service could mass storage, use；In addition, conveyance conduit also needs
Especially processing；It needs to cooperate the very high conveying gas of energy that could obtain certain effect that penetrates, generally matches liquefied ammonia in SNCR
Ammonium hydroxide use is made.If reducing agent uses ammonium hydroxide, ammonium hydroxide foul smelling, volatility and corrosivity are strong, have certain safe operation to want
Ask, but store, processing it is simpler than liquefied ammonia；Injection rigidity, it is good that penetration capacity is sprayed than ammonia, but volatility still compares urea liquid
Greatly, it applies and is still difficult to be deep into the deep of large furnace when wall injector, therefore be generally also employed in middle-size and small-size
On boiler.Need the higher accurate nozzle of mating atomization.It is colourless because urea is nonflammable and explosion if reducing agent uses urea
Tasteless, transport, uses fairly simple safety at storage；Volatility is smaller than ammonium hydroxide, and the penetrability in burner hearth is good；Effect is relatively
Good, denitration efficiency is high, is suitable for the SNCR denitration technique of large-scale or relatively large boiler plant.
Denitrating system and denitration in the stove technique in circulating fluid bed boiler of the invention, its advantages are shown in:
Its SNCR used (selective non-catalytic reduction) technology is to be suitble to CFB boiler (circulating fluidized bed boiler) transformation
Depth denitration technology has many advantages, such as that technological investment and operating cost are low, install and transformation is easy, and does not need setting catalysis
Agent.Although denitration efficiency can still meet newest environmental protection standard since CFB boiler itself NOx emission concentration is low lower than SCR.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of denitrating system in circulating fluid bed boiler of the invention.
Specific embodiment
Denitrating system and denitration in the stove technique in circulating fluid bed boiler to further describe the present invention, below with reference to
Attached drawing is described further it.
Denitrating system in a kind of circulating fluid bed boiler shown in FIG. 1, including boiler 11 and the urea being linked in sequence
Feed bin 1, measuring chute 2, dosing chamber 5, the first delivery pump 6, urea liquid storage tank 7, mixer 8, the second delivery pump 9, injector 10,
Steam inlet tube 3 is connected to dosing chamber 5, injector 10 respectively, tap water inlet pipe 4 respectively with dosing chamber 5, mixer 8 and first
The outlet end of delivery pump 6 is connected to.
Denitrating technique in circulating fluid bed boiler of the invention designs initial NOxConcentration is 250mg/Nm3(butt, 6%
O2, with NO2Meter), export targets (1) export NOxConcentration :≤100mg/Nm3(butt, 6%O2, with NO2It indicates)；(2) the escaping of ammonia
Rate :≤10ppm (butt, 6%O2)。
In the temperature region that fire box temperature is 850~1050 DEG C, reducing agent is utilized urea as, in the feelings of no catalyst
Under condition selectively with the nitrogen oxides NO in inner flue gas of the stovex(mainly about 95%NO and 5%NO2) chemically react, it is raw
At harmless nitrogen and water, to remove NO in flue gasx；First delivery pump 6 is defeated by the urea liquid for preparing completion in dosing chamber 5
It send into urea liquid storage tank 7, makees by the urea liquid of 8 mixed diluting of mixer by several injectors 10 and in steam
Be injected under in boiler 11 sprayed into forming several jetted layers 12 urea liquid of burner hearth mass concentration be 25~
28%, and then realize selective non-catalytic reduction method denitration in the stove.
Currently, the not upper denitration technology of the large number of especially Small-sized C FB of CFB boiler in Anhui Province, this time by peace
The transformation of energy thermoelectricity denitration technology and research, are carried out the feasibility study and engineering mimoir of desulfurization technology, peace are driven and promoted with this
The development and industrial upgrading of emblem CFB denitration technology inside the province, the environmental protection characteristic of CFB boiler is given full play to, and meets the newest ring of country
The requirement of guarantor's standard, and meet following technical requirement:
1, denitrating system should reach the removal of nitrogen oxide efficiency of design requirement.
2, denitrating system the escaping of ammonia rate should be controlled in 10ppm or less.
3, influence of the denitrating system to boiler efficiency should be less than 0.5%.
4, equipment availability should be not less than 98%.
5, it is not more than 85dB in the noise at denitrification apparatus system 1m.
The above content is just an example and description of the concept of the present invention, affiliated those skilled in the art
It makes various modifications or additions to the described embodiments or is substituted in a similar manner, without departing from invention
Design or beyond the scope defined by this claim, be within the scope of protection of the invention.
Claims (1)
1. denitrating system in a kind of circulating fluid bed boiler, including boiler (11), it is characterised in that: further include being linked in sequence
Urea feed bin (1), measuring chute (2), dosing chamber (5), the first delivery pump (6), urea liquid storage tank (7), mixer (8), second
Delivery pump (9), injector (10), steam inlet tube (3) are connected to dosing chamber (5), injector (10) respectively, tap water inlet pipe (4)
It is connected to respectively with the outlet end of dosing chamber (5), mixer (8) and the first delivery pump (6)；
Denitrating system carries out the technique of denitration in circulating fluid bed boiler, designs initial NOxConcentration is 250mg/Nm3, outlet
NOxConcentration :≤100mg/Nm3；The escaping of ammonia rate :≤10ppm；In the temperature region that fire box temperature is 850~1050 DEG C, utilize
Urea as reducing agent, in the case where no catalyst selectively with the nitrogen oxides NO in inner flue gas of the stovexChemistry occurs
Reaction, generates harmless nitrogen and water, to remove NO in flue gasx；First delivery pump (6) will be prepared in dosing chamber (5) and be completed
Urea liquid be delivered in urea liquid storage tank (7), by mixer (8) mixed diluting urea liquid by several spray
Emitter (10) is simultaneously injected into boiler (11) to form several jetted layers (12) under vapor action, sprays into the urea of burner hearth
The mass concentration of solution is 25~28%, and then realizes selective non-catalytic reduction method denitration in the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610537915.5A CN105944546B (en) | 2016-07-08 | 2016-07-08 | Denitrating system and denitration in the stove technique in circulating fluid bed boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610537915.5A CN105944546B (en) | 2016-07-08 | 2016-07-08 | Denitrating system and denitration in the stove technique in circulating fluid bed boiler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105944546A CN105944546A (en) | 2016-09-21 |
| CN105944546B true CN105944546B (en) | 2019-02-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107583444A (en) * | 2017-09-29 | 2018-01-16 | 东方电气集团东方锅炉股份有限公司 | A kind of denitrating system and method that reduction inhibitor agent is carried using steam |
| CN111249875A (en) * | 2020-03-20 | 2020-06-09 | 中国华能集团清洁能源技术研究院有限公司 | Novel SNCR (selective non-catalytic reduction) denitration system and method suitable for deep denitration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102688688B (en) * | 2012-06-07 | 2014-03-12 | 中国华能集团清洁能源技术研究院有限公司 | SNCR (Selective Non Catalytic Reduction) denitration device with low energy consumption and high efficiency for circulating fluidized bed boilers |
| CN104474877A (en) * | 2014-12-04 | 2015-04-01 | 杭州新际能源科技有限公司 | SNCR flue gas denitrification device with atmospheric dilution tank |
| CN104785092A (en) * | 2014-12-31 | 2015-07-22 | 吕鹏飞 | An SNCR flue gas denitration device |
| CN204447709U (en) * | 2015-01-15 | 2015-07-08 | 江苏理文造纸有限公司 | A kind of SNCR denitration system |
| CN204841391U (en) * | 2015-07-14 | 2015-12-09 | 河北诚誉喷雾技术有限公司 | Circulating fluidized bed boiler SNCR deNOx systems |
| CN205730853U (en) * | 2016-07-08 | 2016-11-30 | 安徽电气工程职业技术学院 | Denitrating system in circulating fluid bed boiler |
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Address after: No. 56 Baohe Avenue in Baohe District of Hefei city of Anhui Province in 230051 Applicant after: Anhui Electrical Engineering Professional Technique College Applicant after: National network Anhui Electric Power Co., Ltd Training Center Applicant after: State Grid Corporation of China Address before: No. 56 Baohe Avenue in Baohe District of Hefei city of Anhui Province in 230051 Applicant before: Anhui Electrical Engineering Professional Technique College Applicant before: State Grid Anhui Electric Power Company Training Center Applicant before: State Grid Corporation of China |
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