CN208652905U - A kind of low nitrogen coal-fired hot-water boiler - Google Patents
A kind of low nitrogen coal-fired hot-water boiler Download PDFInfo
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- CN208652905U CN208652905U CN201821030192.0U CN201821030192U CN208652905U CN 208652905 U CN208652905 U CN 208652905U CN 201821030192 U CN201821030192 U CN 201821030192U CN 208652905 U CN208652905 U CN 208652905U
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- Prior art keywords
- air
- combustion zone
- burner
- flue gas
- arch
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 7
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003546 flue gas Substances 0.000 claims abstract description 17
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 44
- 238000000034 method Methods 0.000 description 6
- 238000006722 reduction reaction Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Abstract
The utility model discloses a kind of low nitrogen coal-fired hot-water boilers, including layer burner, layer burner burner hearth is divided into Secondary Air combustion zone and First air combustion zone, layer burner burner hearth arrangement face arch, rear arch and aditus laryngis, overfire air device is introduced respectively at face arch and rear arch, it is First air combustion zone below aditus laryngis, layer burner tail portion connects air preheater, deduster, air-introduced machine, chimney by connection flue.Flue gas recirculation pipeline is drawn between air-introduced machine and chimney, flue gas recirculation pipeline is connect with primary wind pipe, and primary wind pipe is sequentially connected air blower, air preheater, a distribution plenum, is equipped with denitration mouth above combustion zone.The utility model has the beneficial effects that NOx generation can be reduced actively.
Description
Technical field
The utility model belongs to layer combustion chain grate boiler control discharged nitrous oxides technical field, is related to a kind of environment-friendly type
DHL corner tube type coal-fired hot-water boiler.
Background technique
China's coal-burned industrial boiler is large number of, is one of main source of atmosphere pollution, and be mainly distributed on population
Intensive residential area and industrial area produces tremendous influence to local air quality.It is fast due to concentrated supply of heating in the city in recent years
Speed development, coal consumption sharp increase, the pollutant discharge amounts such as nitrogen oxides (NOx) increase year by year, and atmosphere polluting problem is increasingly tight
Weight.During 12, country has put into effect the strict standard of control NOx emission, and standard is continuously improved, and Environmental Protection Situation is very tight
It is high.
Common SCR (selective catalytic reduction) domestic and international at present or SNCR (selective non-catalytic reduction method) technology category
In gas denitrifying technology, one-time investment is larger, and occupation area of equipment is big；SNCR needs stringent high temperature window, moment consumption
The substances such as ammonia, urea, operating cost are higher；SCR will not only spray ammonia, also accelerate denitration anti-by expensive catalyst
It answers, operating cost is higher.As boiler for producing enterprise, how product to be accomplished not only to meet country or local environmental requirement but also guaranteed
Its effective power output and the thermal efficiency become the new challenge that must be faced.In consideration of it, my company is in DHL 70-1.6/130/70-
Combustion denitration -- low-NO_x combustion technology is used on AII type corner tube type coal-fired hot-water boiler, not only reduces the discharge of NOx in flue gas,
The requirement of national standard is met, while reducing the reprocessing equipment of tail flue gas.
Utility model content
The purpose of this utility model is to provide a kind of low nitrogen coal-fired hot-water boilers, the utility model has the beneficial effects that energy
It is enough actively to reduce NOx generation.
Technical solution used by the utility model includes layer burner, and layer burner hearth combustion region is divided into First air combustion
It burns area and Secondary Air combustion zone, layer burner burner hearth is disposed with face arch, rear arch and aditus laryngis, introduces respectively at face arch and rear arch secondary
Wind apparatus, aditus laryngis lower section are primary combustion zone, are intermediate zone above aditus laryngis.The flue gas of this layer of burner back-end ductwork is divided into
Two-way is connected to chimney all the way, and another way by air preheater enters air distribution after mixing by flue gas recirculation pipeline with First air
Room is sent into furnace.It is equipped with denitrification apparatus in the top of intermediate zone simultaneously, it is up to standard to be further ensured that NOx emission continues.
Detailed description of the invention
Fig. 1 is the utility model boiler structure schematic diagram.
In figure, 1. layers of burner, 2. Secondary Air combustion zones, 3. face arch, 4. rear arches, 5. aditus laryngis, 6. overfire air devices, 7. is primary
Wind combustion zone, 8. air preheaters, 9. flues, 10. dedusters, 11. air-introduced machines, 12. chimneys, 13. flue gas recirculation pipelines, 14. 1
Secondary air blower, 15. primary wind pipes, 16. distribution plenums, 17. denitration mouths.
Specific embodiment
The utility model is described in detail With reference to embodiment.
For the utility model as shown in Figure 1, include layer burner 1, the burner hearth of layer burner 1 is divided into Secondary Air combustion zone 2 and primary
Wind combustion zone 7,1 burner hearth of layer burner arrange face arch 3, rear arch 4 and aditus laryngis 5, introduce Secondary Air dress at face arch 3 and rear arch 4 respectively
6 are set, is First air combustion zone 7 below aditus laryngis 5,1 tail portion of layer burner connects air preheater 8 by connection flue 9, deduster 10, draws
Blower 11, chimney 12.Draw flue gas recirculation pipeline 13 between air-introduced machine 11 and chimney 12, flue gas recirculation pipeline 13 and primary
Air piping 15 connects, and primary wind pipe 15 is sequentially connected an air blower 14, air preheater 8, distribution plenum 16, sets above combustion zone 2
There is denitration mouth 17.The utility model layer burner can be DHL type layer burner.
Low nitrogen burning is made of Researched of Air Staging Combustion Burning Pulverized Coal, flue gas recirculation and automatic combustion control system three parts, is a kind of
The technology for actively reducing NOx generation does not add reducing agent, without using catalyst, NOx is reduced into N2 in combustion, from
And reduce the discharge of NOx；Denitration control system guarantees the stabilization of denitration in boiler combustion process, runs at standard, and reduces de-
The NOx concentration of nitre device portal, to save operating cost.
Combustion zone is divided into First air combustion zone 7 and Secondary Air combustion zone 2, First air combustion zone by utility model device
Air needed for being sent into all fuel and 80% burning in 7, fuel burns under conditions of anoxic, so that burning velocity and temperature
It reduces, to inhibit the generation of NOx；While the CO and NO for generation of burning carry out reduction reaction, by generated NOx partial reduction
At N2, achieve the purpose that reduce NOx.The Secondary Air that overfire air device 6 ejects from face arch 3 and rear arch 4 to aditus laryngis 5 can be strong
Ground rough air increases the residence time of fly ash granule and promotes particle after-flame, while Researched of Air Staging Combustion Burning Pulverized Coal occurs, and reduces gas
Incomplete combustion loss.
Flue gas recirculating technique, core are to spray into partial fume again using hypoxemia feature possessed by flue gas
The suitable position of burner hearth reduces local temperature in burner hearth and forms local reduction atmosphere, inhibits the generation of NOx, to drop
The concentration of emission of low NOx.The advantages of flue gas recirculation system and good effect are:
A. without increasing recirculation blower, system is simpler, energy saving；
B. it is sent into distribution plenum after boiler tail flue gas is mixed with First air, advantageously reduces First air oxygen content, inhibits NOx
Generation；
C. not sufficiently combusted, full combustion is carried out in the intermediate zone of Researched of Air Staging Combustion Burning Pulverized Coal.
Three systems (air classification, flue gas recirculation and denitration control system) of the low nitrogen burning of the utility model are layer by layer
It is progressive, carry out composite denitration can also be combined with independent operating, reach most economical efficient boiler nitrogen oxides control effect
Fruit.Low nitrogen burning denitration can integrally make NOx concentration reduce by 40%~60%, be suitable for NOx emission < 200mg/Nm3Standard want
It asks.
The advantages of the utility model, also resides in:
(1), reducing agent is not added, catalyst is not used, actively reduces NOx generation；
(2), simple process, cost of investment are low, without operating cost；
(3), the ancillary equipment of denitration is simplified, construction area is minimized；
(4), one-time investment, no subsequent investment, operating cost are low, and simple process, occupied area are small, without secondary pair
Product does not corrode boiler and flue；
(5), when boiler load is lower, denitration efficiency is still fine, and failed areas is not present；
(6), the ancillary measure that can be used as SCR or SNCR scheme saves its operating cost；
(7), boiler implosion is intelligent, remains stable combustion conditions, reduces labor intensity of workers；
(8), boiler power consumption, energy consumption is effectively reduced, realizes the double goal of energy conservation and emission reduction；
(9), the denitration transformation that can be applied to existing boiler, can also be applied to design and the construction period of new boiler；
(10), be a kind of suitable for China, great competitiveness reduction NOx and haze technical method.
The above is only the better embodiment to the utility model, not makees any form to the utility model
On limitation, all according to the technical essence of the utility model any simple modification made to the above embodiment, equivalent variations
With modification, it is all within the scope of the technical scheme of the utility model.
Claims (1)
1. a kind of low nitrogen coal-fired hot-water boiler, it is characterised in that: including layer burner, layer burner burner hearth be divided into Secondary Air combustion zone and
First air combustion zone, layer burner burner hearth arrange face arch, rear arch and aditus laryngis, introduce overfire air device respectively at face arch and rear arch,
It is First air combustion zone below aditus laryngis, layer burner tail portion connects air preheater, deduster, air-introduced machine, chimney by connection flue, draws
Flue gas recirculation pipeline is drawn between blower and chimney, flue gas recirculation pipeline connect with primary wind pipe, primary wind pipe according to
Secondary connection air blower, air preheater, a distribution plenum, combustion zone top are equipped with denitration mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821030192.0U CN208652905U (en) | 2018-07-02 | 2018-07-02 | A kind of low nitrogen coal-fired hot-water boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821030192.0U CN208652905U (en) | 2018-07-02 | 2018-07-02 | A kind of low nitrogen coal-fired hot-water boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208652905U true CN208652905U (en) | 2019-03-26 |
Family
ID=65782883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821030192.0U Expired - Fee Related CN208652905U (en) | 2018-07-02 | 2018-07-02 | A kind of low nitrogen coal-fired hot-water boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208652905U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296391A (en) * | 2019-06-25 | 2019-10-01 | 上海兴能环保科技有限公司 | Low nitrogen burning chain furnace with alternately plasticity stratified combustion and flue gas recirculation |
| CN114413252A (en) * | 2021-10-11 | 2022-04-29 | 青岛理工大学 | Biomass low-nitrogen layer combustion experimental furnace based on flue gas recirculation |
-
2018
- 2018-07-02 CN CN201821030192.0U patent/CN208652905U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296391A (en) * | 2019-06-25 | 2019-10-01 | 上海兴能环保科技有限公司 | Low nitrogen burning chain furnace with alternately plasticity stratified combustion and flue gas recirculation |
| CN114413252A (en) * | 2021-10-11 | 2022-04-29 | 青岛理工大学 | Biomass low-nitrogen layer combustion experimental furnace based on flue gas recirculation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190716 Address after: No. 99 Wangda Road, Jiangning Binjiang Economic Development Zone, Nanjing City, Jiangsu Province, 210000 Patentee after: Middle nuclear-plant Nanjing Co., Ltd Address before: 730065 No. 151 Xinhe Road, Xigu District, Lanzhou City, Gansu Province Patentee before: China Power Equipment Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190326 Termination date: 20200702 |