CN203549804U - CFB (circulating fluidized bed) boiler combustion optimization and SNCR (selective non-catalytic reduction) denitrification device - Google Patents
CFB (circulating fluidized bed) boiler combustion optimization and SNCR (selective non-catalytic reduction) denitrification device Download PDFInfo
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- CN203549804U CN203549804U CN201320707193.5U CN201320707193U CN203549804U CN 203549804 U CN203549804 U CN 203549804U CN 201320707193 U CN201320707193 U CN 201320707193U CN 203549804 U CN203549804 U CN 203549804U
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- 238000005457 optimization Methods 0.000 title claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 title abstract description 5
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract 2
- 239000003638 chemical reducing agent Substances 0.000 claims description 89
- 239000012895 dilution Substances 0.000 claims description 21
- 238000010790 dilution Methods 0.000 claims description 21
- 239000007921 spray Substances 0.000 claims description 16
- 238000009826 distribution Methods 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 4
- 238000003916 acid precipitation Methods 0.000 abstract description 3
- 239000003245 coal Substances 0.000 abstract description 2
- 239000000809 air pollutant Substances 0.000 abstract 1
- 231100001243 air pollutant Toxicity 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 230000009257 reactivity Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
The utility model relates to a CFB (circulating fluidized bed) boiler combustion optimization and SNCR (selective non-catalytic reduction) denitrification device. Pollution of acid rain has attracted high attention of the Chinese government. In order to protect the atmospheric environment in China, the state released more rigorous Emission Standard of Air Pollutants for Thermal Power Plants GB13223-2011 in July 2011. The low NOx emission characteristic of a CFB boiler can not meet the requirements of the latest standard. The device comprises a CFB boiler (1), wherein an air distributor (20) is installed at the bottom of the CFB boiler; the CFB boiler is connected with a cyclone separator (3) by a back feeding inclined tube (2); the cyclone separator is connected with an SNCR furnace front denitrification system and a tail flue (4); the tail flue comprises a superheater (5), a coal economizer (6) and an air preheater (7) which are connected in sequence. The device is applied to the CFB boiler.
Description
technical field:
the utility model relates to a kind of CFB boiler optimization burning and SNCR denitrification apparatus.
background technology:
the nitrogen oxide that coal combustion produces is to form acid rain, destroys the major pollutants of ecological environment and formation photochemical fog, directly harm humans health and the ecological balance, and cause heavy economic losses, crisis health of people can to country and people's property.Therefore the pollution of acid rain has caused the great attention of the Chinese government, in order to protect China's atmospheric environment, in July, 2011, country issued more severe < < fossil-fuel power plant atmospheric pollutant emission standard > > GB13223-2011, the low NOx drainage characteristic of CFB boiler cannot meet the requirement of newest standards, in-service most CFB boilers will be implemented denitration technology transformation, SNCR denitration technology is with its low disposable input, low operating cost, be applicable to very much the control for NOx pollutant of the transformation of CFB Denitration in Boiler and new-built unit, therefore, exploitation one is suitable under integral denitration condition, the burning of CFB boiler optimization and SNCR (SNCR) denitration technology are very necessary with equipment.
summary of the invention:
the purpose of this utility model is to provide a kind of CFB boiler optimization burning and SNCR denitrification apparatus.
above-mentioned object realizes by following technical scheme:
a kind of CFB boiler optimization burning and SNCR denitrification apparatus, its composition comprises: CFB boiler, described CFB boiler bottom is installed air distribution plate, and described CFB boiler connects cyclone separator by feed back inclined tube, and described cyclone separator connects SNCR stokehold denitrating system and back-end ductwork; Wherein, described back-end ductwork comprises the superheater, economizer and the air preheater that connect successively.
the described burning of CFB boiler optimization and SNCR denitrification apparatus, described SNCR stokehold denitrating system connects reductant injection system by reducing agent spray gun, described reductant injection system connects reductant metering and distribution system, described reductant metering is connected reducing agent on-line dilution system with distribution system, described reducing agent on-line dilution system connects reductant supply system, described reductant supply system connects reducing agent storage tank, described reducing agent storage tank connects reducing agent dissolving tank by reducing agent delivery pump, described reducing agent dissolving tank connects power plant's steam and demineralized water.
the described burning of CFB boiler optimization and SNCR denitrification apparatus, described cyclone separator connects the superheater of back-end ductwork.
the described burning of CFB boiler optimization and SNCR denitrification apparatus, described reducing agent on-line dilution system connects dilution water tank by dilution water pump.
the described burning of CFB boiler optimization and SNCR denitrification apparatus, described reducing agent spray gun is arranged on the entrance horizontal flue place of described cyclone separator.
the beneficial effects of the utility model:
1. the utility model is that CFB boiler design has connected SNCR denitrating system, this SNCR denitrating system comprises storage, the preparation system of reducing agent, and reducing agent supply, reducing agent on-line dilution, reductant metering and distribution, reductant injection system composition, and there is control system automatically to control.Whole plant area area is little, and disposable input cost is low, and the removal efficiency of NOx is high, at the escapement ratio of ammonia, is less than 8mg/m
3
(standard state, butt, 6% O
2
) condition under, total denitration efficiency can reach more than 60%, and the expense that removes of the NOx of process system is less than the expense that removes of SCR, construction cost is lower than 50% of SCR construction cost.Can realize afterbody online detection instrument and carry out signal feedback by measuring NOx concentration, control the addition of urea or carbonic hydroammonium, reduce operating cost.
the utility model utilizes the original cyclone separator of CFB boiler to transform, the reducing agent spray gun being connected with SNCR denitrification apparatus is installed at cyclone inlet horizontal flue place, realized CFB boiler and SNCR combined denitration, the one-time investment of reduction power plant that can be larger, cost-saving.
the accessory substance of the utility model equipment denitration is through back-end ductwork processing, and accessory substance stability is high, pollution-free, and whole device has higher popularization and value.
accompanying drawing explanation:
accompanying drawing 1 is structural representation of the present utility model.
in figure, 1 is CFB boiler, and 2 is feed back inclined tube, and 3 is cyclone separator, 4 is back-end ductwork, 5 is superheater, and 6 is economizer, and 7 is air preheater, 8 is reducing agent spray gun, 9 is reductant injection system, and 10 is reductant metering and distribution system, and 11 is reducing agent on-line dilution system, 12 is reductant supply system, 13 is reducing agent storage tank, and 14 is reducing agent delivery pump, and 15 is reducing agent dissolving tank, 16 is power plant's steam, 17 is demineralized water, and 18 is dilution water pump, and 19 is dilution water tank, 20 is air distribution plate, and 21 is boiler smoke.
the specific embodiment:
embodiment 1:
a kind of CFB boiler optimization burning and SNCR denitrification apparatus, its composition comprises: CFB boiler 1, described CFB boiler bottom is installed air distribution plate 20, and described CFB boiler connects cyclone separator 3 by feed back inclined tube 2, and described cyclone separator connects SNCR stokehold denitrating system and back-end ductwork 4; Wherein, described back-end ductwork comprises the superheater 5, economizer 6 and the air preheater 7 that connect successively.
the burning adjustment of described CFB boiler is mainly on Secondary Air stratified combustion basis, keeps total air distribution amount constant, further optimizes primary and secondary air ratio, and in increase, upper Secondary Air and after-flame wind, realize Secondary Air is carried out to deep-graded; By adjusting each layer of Secondary Air air distribution ratio, adjust in time different combustion phases excess air coefficients, suppress NOx and generate; Last layer after-flame wind makes the further fully burning of the contained combustible of flying dust in stage, reduces unburned carbon in flue dust, is guaranteeing that, under the prerequisite of boiler efficiency, NOx discharge capacity reduces by 10%.
embodiment 2:
according to the burning of CFB boiler optimization and SNCR denitrification apparatus described in embodiment 1, described SNCR stokehold denitrating system connects reductant injection system 9 by reducing agent spray gun 8, described reductant injection system connects reductant metering and distribution system 10, described reductant metering is connected reducing agent on-line dilution system 11 with distribution system, described reducing agent on-line dilution system connects reductant supply system 12, described reductant supply system connects reducing agent storage tank 13, described reducing agent storage tank connects reducing agent dissolving tank 15 by reducing agent delivery pump 14, described reducing agent dissolving tank connects power plant's steam 16 and demineralized water 17.
in described reducing agent dissolving tank, add reducing agent solid and a certain amount of power plant steam, the demineralized water of urea or carbonic hydroammonium to stir, configure reductant solution; After having prepared burden, open reducing agent delivery pump, the reductant solution preparing is delivered to described reducing agent storage tank, when described reducing agent tank level stops reducing agent delivery pump during in a high position, reducing agent delivery pump rate of discharge is controlled by the aperture of electric control valve; When dosing chamber liquid level reaches below low level, stop described reducing agent delivery pump, again prepare burden next time.
when the NOx of boiler load or furnace outlet change in concentration, the reducing agent consumption of sending into burner hearth also should change thereupon, and this will cause the flow of sending into spray gun to change.If the changes in flow rate of spray gun is too large, atomized spray effect be will have influence on, thereby denitration rate and the escaping of ammonia affected, therefore, designed at reducing agent line dilution system, be used for guaranteeing that when operating condition changes in nozzle, fluid flow is constant.The reducing agent of specific concentrations, from the output of reducing agent storage tank, increases Liao Yi road dilution water and sneaks into transfer pipeline with dilute solution, by the flow of controlling reducing agent, regulates final reductant concentration to meet the requirement of boiler different load.
the online good reducing agent of prepared and diluted is delivered to each layer of jetted layers, and whether each jetted layers is provided with this jetted layers of total valve control and puts into operation, and the jetted layers not putting into operation is driven and exited by electricpropulsion installation.Each jetted layers is provided with flow control valve and flow measurement equipment.Spray required atomizing medium and adopt atomizing steam, atomizing steam adopts station-service gas, and stokehold house steward is provided with flow pressure and measures, and Fen Silu leads to each jetted layers, and the atomizing steam house steward of each jetted layers is provided with pressure and regulates and pressure measxurement, then leads to each spray gun.
the robot control system(RCS) that stokehold reducing agent sprays part is long-range and two kinds of operational modes on the spot, wherein operates on the spot highest level.During Long-distance Control, SNCR stokehold denitrating system is directly controlled by DCS system, can survey the concentration of dosing chamber, the liquid level of reducing agent storage tank by automatic monitoring, and detect the content of the NOx of boiler back end ductwork, by PID, regulate and control the flow that sprays into the reducing agent in burner hearth, reach the object of denitration.
system, when normal work, every time period register system operating condition data, comprises thermal technology's real time execution parameter, equipment operation condition etc.When fault occurs, system is by timely record trouble information.System can be stored bulk information, automatically generates working report and failure logging, and canned data can be inquired about by query key.
embodiment 3:
according to the burning of CFB boiler optimization and SNCR denitrification apparatus described in embodiment 1 or 2, described cyclone separator connects the superheater of back-end ductwork.
embodiment 4:
according to the burning of CFB boiler optimization and SNCR denitrification apparatus described in embodiment 2, described reducing agent on-line dilution system connects dilution water tank 19 by dilution water pump 18.
embodiment 5:
according to the burning of CFB boiler optimization and SNCR denitrification apparatus described in embodiment 2 or 4, described reducing agent spray gun is arranged on the entrance horizontal flue place of described cyclone separator.
according to structure and the smoke characteristic at the cyclone inlet horizontal flue place of described CFB boiler, that is: this place's temperature approaches the optimal reaction temperature of SNCR denitrating system very much, has avoided NH
3
oxidation Decomposition problem; This place's flue gas has ejector action to the reducing agent spraying into, and boiler smoke speed and reducing agent spraying velocity angle are acute angle, are conducive to effective mixing of reducing agent and boiler smoke; The penetration range needing in the spraying of cyclone inlet horizontal flue place is short, and vaporific reducing agent can be full of in the cross section perpendicular to boiler smoke velocity attitude with comparalive ease, thereby guarantees to mix; Cyclone inlet horizontal flue place boiler smoke has stroke far away to central tube outlet, reducing agent can obtain the longer time of staying, choosing this place is between inlet zone, to guarantee that reducing agent fully mixes with boiler smoke in stove, improves reactivity, controls the escaping of ammonia rate lower than 8mg/m
3
time, make SNCR denitration efficiency improve 8%, therefore determine the position that sprays into that separator inlet horizontal flue place is reducing agent.
Claims (5)
1.
a kind of CFB boiler optimization burning and SNCR denitrification apparatus, its composition comprises: CFB boiler, it is characterized in that: described CFB boiler bottom is installed air distribution plate, described CFB boiler connects cyclone separator by feed back inclined tube, and described cyclone separator connects SNCR stokehold denitrating system and back-end ductwork; Wherein, described back-end ductwork comprises the superheater, economizer and the air preheater that connect successively.
2.
cFB boiler optimization burning according to claim 1 and SNCR denitrification apparatus, it is characterized in that: described SNCR stokehold denitrating system connects reductant injection system by reducing agent spray gun, described reductant injection system connects reductant metering and distribution system, described reductant metering is connected reducing agent on-line dilution system with distribution system, described reducing agent on-line dilution system connects reductant supply system, described reductant supply system connects reducing agent storage tank, described reducing agent storage tank connects reducing agent dissolving tank by reducing agent delivery pump, described reducing agent dissolving tank connects power plant's steam and demineralized water.
3.
cFB boiler optimization burning according to claim 1 and 2 and SNCR denitrification apparatus, is characterized in that: described cyclone separator connects the superheater of back-end ductwork.
4.
cFB boiler optimization burning according to claim 2 and SNCR denitrification apparatus, is characterized in that: described reducing agent on-line dilution system connects dilution water tank by dilution water pump.
5.
according to the burning of CFB boiler optimization and SNCR denitrification apparatus described in claim 2 or 4, it is characterized in that: described reducing agent spray gun is arranged on the entrance horizontal flue place of described cyclone separator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320707193.5U CN203549804U (en) | 2013-11-11 | 2013-11-11 | CFB (circulating fluidized bed) boiler combustion optimization and SNCR (selective non-catalytic reduction) denitrification device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320707193.5U CN203549804U (en) | 2013-11-11 | 2013-11-11 | CFB (circulating fluidized bed) boiler combustion optimization and SNCR (selective non-catalytic reduction) denitrification device |
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| CN203549804U true CN203549804U (en) | 2014-04-16 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509081A (en) * | 2016-01-28 | 2016-04-20 | 杜梦凡 | System and process for denitration by spraying ammonia gas in large-sized boiler high-temperature flue gas area |
| CN105879601A (en) * | 2016-06-25 | 2016-08-24 | 南通神马线业有限公司 | Fluidized bed boiler denitration device |
| CN105920997A (en) * | 2016-06-12 | 2016-09-07 | 华中科技大学 | Coal-fired boiler denitration system and method with over fire air and SNCR coupled |
| CN108019742A (en) * | 2016-11-03 | 2018-05-11 | 中国电力工程顾问集团华北电力设计院有限公司 | CFB boiler tertiary air central tube |
-
2013
- 2013-11-11 CN CN201320707193.5U patent/CN203549804U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509081A (en) * | 2016-01-28 | 2016-04-20 | 杜梦凡 | System and process for denitration by spraying ammonia gas in large-sized boiler high-temperature flue gas area |
| CN105509081B (en) * | 2016-01-28 | 2017-11-17 | 杜梦凡 | Spray ammonia denitrating system and denitrating technique in large-sized boiler high-temperature flue gas region |
| CN105920997A (en) * | 2016-06-12 | 2016-09-07 | 华中科技大学 | Coal-fired boiler denitration system and method with over fire air and SNCR coupled |
| CN105920997B (en) * | 2016-06-12 | 2018-09-25 | 华中科技大学 | A kind of coal-burning boiler denitrating system that burnout degree is coupled with SNCR and method |
| CN105879601A (en) * | 2016-06-25 | 2016-08-24 | 南通神马线业有限公司 | Fluidized bed boiler denitration device |
| CN108019742A (en) * | 2016-11-03 | 2018-05-11 | 中国电力工程顾问集团华北电力设计院有限公司 | CFB boiler tertiary air central tube |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140416 |
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| CX01 | Expiry of patent term |