CN202993174U - Fire coal gas combination type high-efficiency low discharge grate firing device - Google Patents
Fire coal gas combination type high-efficiency low discharge grate firing device Download PDFInfo
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- CN202993174U CN202993174U CN 201220647020 CN201220647020U CN202993174U CN 202993174 U CN202993174 U CN 202993174U CN 201220647020 CN201220647020 CN 201220647020 CN 201220647020 U CN201220647020 U CN 201220647020U CN 202993174 U CN202993174 U CN 202993174U
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- China
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- burning
- gas
- zone
- combustion chamber
- grate
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Abstract
The utility model relates to a fire coal gas combination type high-efficiency low discharge grate firing device. The fire coal gas combination type high-efficiency low discharge grate firing device comprises a combustor, and a fire grate, wherein the combustor is divided into a main combustion zone, a reburning zone which is located at the upper position of the main combustion zone and a burning-out zone which is adjacent to the upper opening of the combustor, a gas nozzle which is communicated with a middle position between the combustor and the reburning zone and a burning-out air nozzle which is communicated with the lower portion of the burning-out zone are arranged on the combustor, a smoke recycling air room is arranged on the fire grate and close to the part of the bottom portion of a material inlet, and the smoke recycling air room is communicated with the tail gas outlet of the combustor through a recycling draught fan and an air liquid separator. The fire coal gas combination type high-efficiency low discharge grate firing device can not only reduce conversion from fuel nitrogen to Nox, but also improve burning efficiency of a furnace simultaneously.
Description
Technical field
The utility model relates to a kind of grate-firing combustion device, particularly a kind of NOx and SO that reduces grate furnace by adjusting combustion system (flue gas recirculating technique, fuel-staged combustion technology and coal burning and gas burning compounding technique combine)
2discharge, improve the grate-firing combustion device of the efficiency of combustion of grate firing boiler simultaneously.
Background technology
In China's energy resource structure, the coal dominate, and within the quite a long time from now on, the status of this basic energy resource can not shake.Approximately 530,000 of China's coal-burned industrial boiler recoverable amounts, its year coal consumption accounts for 1/3 left and right of China's year coal consumption.At present, China's Industrial Boiler used is mainly grate furnace, and due to aspects such as design and operations, boiler thermal output is generally lower.For improving boiler efficiency, often, by improving temperature levels in stove, accelerate burning velocity, improve burn-off rate, but this has caused the discharge of NOx to increase simultaneously.2012, China promulgated up-to-date " ambient air quality ", and the discharge standard of NOx is brought up to better level.Therefore, binder course burner characteristics, the boiler of efficient, the low pollutant emission of design is significant.
(application number: 200710120221.2) application discloses a kind of low pollution efficient burning method of grate firing boiler to patent of invention " coal thermal decomposition grate firing apparatus and combustion method thereof ".But the generation that the fuel gas produced due to grate furnace oxidative pyrolysis chamber in this patent and granule semicoke can reduce NOx, because pyrolysis chamber is in oxidation environment (air) and the relatively low situation generation of temperature pyrolysis, therefore produce reducing gas (NH
i, HCN, CH
i, H
2with CO etc.) less, and pyrolysis rate is lower, and reducibility gas output is subject to ature of coal to change fluctuation greatly, is difficult for regulating controlling, and particularly for soft coal, produces reducing gas still less, the reducing NOx DeGrain; This patent affects exerting oneself of boiler due to the oxidative pyrolysis chamber being set in grate furnace; In addition, the transformation to boiler body in the engineering application of this patent is larger, and construction is difficulty comparatively.Along with the raising day by day of environmental requirement, will be stricter to the NOx discharge, so the industrial usability of this patent is poor, can not meet the environmental requirement of increasingly stringent.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of coal burning and gas burning combined high-efficiency low emission grate-firing combustion device is provided, and this device reduces the conversion of fuel bound nitrogen to NOx, can also improve the efficiency of combustion of grate furnace simultaneously.
The technical scheme that the utility model is taked is:
A kind of coal burning and gas burning combined high-efficiency low emission grate-firing combustion device, comprise combustion chamber, fire grate, reburning zone and the close combustion chamber burning-out zone suitable for reading that is divided into primary zone, top, primary zone in combustion chamber, combustion chamber is provided with the gas nozzle communicated with the centre position, reburning zone of combustion chamber, the after-flame wind nozzle communicated with the burning-out zone bottom, described fire grate is established the flue gas recirculation air compartment near the part bottom of charging aperture, and the flue gas recirculation air compartment communicates with the tail gas outlet of combustion chamber by circulating fan, gas-solid separator.
Described gas nozzle is taken into account pressure-reducing valve by flow and is connected with the reducing gas conveying device.
Described after-flame wind nozzle is connected with air preheater by pipeline.
After fully being mixed, coal dust and sulphur-fixing agent send into combustion chamber, the heating coal dust, bottom passes into flue gas recycled simultaneously, and rapid pyrolysis occurs coal dust, produces reducibility gas, spray into reducibility gas in the both sides, reburning zone, form local reduction atmosphere, reach the purpose of strengthening NOx reduction, the uncombusted particle burns away in Ran Ran district, combustion chamber, burnt after the tail gas of generation extracts dedusting and participated in flue gas recirculation, entered combustion chamber for above-mentioned pyrolysis, burning.
The utility model is by introducing grate furnace by flue gas recirculating technique, fuel-staged combustion technology and coal burning and gas burning compounding technique, on the one hand the afterbody flue gas recycled is incorporated into to the flue gas recirculation air compartment, the pyrolysis coal dust produces a large amount of reducing gas (NHi, HCN, CHi, H rapidly
2with CO etc.), because oxygen concentration is low, ignition temperature is low, makes NOx yield reducation 25% left and right; On the other hand by the both sides gas nozzle that liquidates, add reducibility gas, form fuel-rich regions above the primary zone of combustion chamber, the NOx that strengthening reduction primary zone burning generates, reduce the conversion of fuel bound nitrogen to NOx, the uncombusted particle burns away above combustion chamber, realizes stove fuel fractional combustion in burner hearth, can also improve the efficiency of combustion of grate furnace simultaneously.Described NOx removal efficiency is that 35%～60%, SOx removal efficiency is more than 80%, and the grate furnace efficiency of combustion improves 1.5%～2.5%.
The accompanying drawing explanation
Fig. 1 the utility model apparatus structure schematic diagram;
Wherein: 1. hopper, 2. after-flame wind nozzle, 3. face arch, 4. drum, 5. gas-solid separator, 6. circulating fan, 7. air air compartment, 8. flue gas recirculation air compartment, 9. fire grate, 10. combustion chamber, 11. gas nozzles, ,Ⅱ reburning zone, I primary zone, III burning-out zone.
The specific embodiment
A kind of coal burning and gas burning combined high-efficiency low emission grate-firing combustion device, comprise combustion chamber 10, fire grate 9, reburning zone II and the close combustion chamber 10 burning-out zone III suitable for reading that is divided into I top, Ⅰ, primary zone, primary zone in combustion chamber 10, combustion chamber 10 is provided with the gas nozzle 11 communicated with II centre position, 10 reburning zone, combustion chamber, the after-flame wind nozzle 2 communicated with burning-out zone III bottom, described fire grate 9 is established flue gas recirculation air compartment 8 near the part bottom of charging aperture, and flue gas recirculation air compartment 8 communicates with the tail gas outlet of combustion chamber 10 by circulating fan 6, gas-solid separator 5.Charging aperture goes out to establish hopper 1, and gas nozzle 11, after-flame wind nozzle 2 are located on the face arch 3 of boiler.
Described gas nozzle is taken into account pressure-reducing valve by flow and is connected with the reducing gas conveying device.
Described after-flame wind nozzle is connected with air preheater by pipeline.
Coal dust and sulphur-fixing agent are fully mixed and send into combustion chamber, and coal dust is in heating, and bottom passes under flue gas recycled rapid pyrolysis occurs simultaneously, produces reducibility gas (NHi, HCN, CH
i, H
2with CO etc.), because oxygen concentration is low, ignition temperature is low, make NOx yield reducation 25% left and right, and install the gas nozzle that liquidates in the both sides, reburning zone, spray into reducibility gas (natural gas, the reducibility gas fuel such as coal gas), form local reduction atmosphere, reach the purpose of strengthening NOx reduction, the uncombusted particle burns away in Ran Ran district, combustion chamber, burnt after the tail gas of generation extracts dedusting and participated in flue gas recirculation, enter combustion chamber for above-mentioned pyrolysis, (the first-stage burning zone that coal dust and sulphur-fixing agent carry out on the grate furnace fire grate is called primary zone in the burning use, the secondary firing zone that reducing gas and granule semicoke are sent at airflow function is called reburning zone, the uncombusted particle forms third level combustion zone with " fiery windward " by the rear arch guide effect and is called burning-out zone above reburning zone).
The temperature range of afterbody flue gas recycled is 350 ℃～450 ℃, and flue gas oxygen content is 3%～8%(v/v), guarantee the hypoxemia pyrolysis atmosphere, flow can be controlled by valve.The reproducibility combustion gas sprayed into (natural gas, coal gas etc.) speed is 10m/s～15m/s, after the grate furnace feed, starts to add.In coal, volatile matter content is lower, N content is higher, and the reducibility gas intake is larger.The mixed proportion scope of sulphur-fixing agent is to calculate by 1.5%～2.5% of the quality of coal, 100～1300 ℃ of heating-up temperatures.
Grate furnace afterbody flue gas recycled is because fly ash content is higher, need to be after gas-solid separator separates (efficiency of dust collection 60%～80%), enter the flue gas recirculation air compartment by circulating fan, can reduce like this ignition temperature, reduce oxygen concentration, reduced to a certain extent the generation of NOx, the reducibility gas sprayed into that simultaneously liquidates can reach the purpose of strengthening reducing NOx.The homogeneous chemical reaction approach of reducing NOx is as follows:
NO and Ammonia (NH in reducing atmosphere
i) and nitrogen-atoms (N) reaction generation N
2, key reaction has:
NO+NH→N
2+OH (1)
NO+NH
2→N
2+H
2O (2)
NO+N→N
2+O (3)
NO and hydrocarbon root (CH in reducing atmosphere
i) in conjunction with generating cyanogen (HCN)
NO+CH→HCN+O (4)
NO+CH
2→HCN+OH (5)
NO+CH
3→HCN+H
2O (6)
HCN presses to react with O, OH, H and generates intermediate product cyanogen oxide:
HCN+O→NCO+H (7)
HCN+OH→HNCO+H (8)
The cyanogen oxide is converted into Ammonia in reducing atmosphere:
NCO+H→NH+CO (9)
HNCO+H→NH
2+CO (10)
NH+H→N+H
2 (11)
NH
2+NH
2→NH
3+NH (12)
The NH generated
ican NO be reduced to N by formula (1), (2), (3) as run into NO in reducing atmosphere
2.
H
2with reacting mainly of NO, by following reaction path, undertaken:
H
2+O
2→H+H
2O (13)
H
2+H
2O→H+H+H
2O (14)
H+NO+M→HNOM+M (15)
H
2+HNO→H
2O+NH (16)
HNO+H → NH+OH (17) is under hot conditions, and the CO reductive NO is mainly by following reaction:
CO+NO→CO
2+N (18) 。
Claims (3)
1. a coal burning and gas burning combined high-efficiency low emission grate-firing combustion device, comprise combustion chamber, fire grate, reburning zone and the close combustion chamber burning-out zone suitable for reading that is divided into primary zone, top, primary zone in combustion chamber, it is characterized in that, combustion chamber is provided with the gas nozzle communicated with the centre position, reburning zone of combustion chamber, the after-flame wind nozzle communicated with the burning-out zone bottom, described fire grate is established the flue gas recirculation air compartment near the part bottom of charging aperture, and the flue gas recirculation air compartment communicates with the tail gas outlet of combustion chamber by circulating fan, gas-solid separator.
2. a kind of coal burning and gas burning combined high-efficiency low emission grate-firing combustion device according to claim 1, is characterized in that, described gas nozzle is taken into account pressure-reducing valve by flow and is connected with the reducing gas conveying device.
3. a kind of coal burning and gas burning combined high-efficiency low emission grate-firing combustion device according to claim 1, is characterized in that, described after-flame wind nozzle is connected with air preheater by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647020 CN202993174U (en) | 2012-11-30 | 2012-11-30 | Fire coal gas combination type high-efficiency low discharge grate firing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220647020 CN202993174U (en) | 2012-11-30 | 2012-11-30 | Fire coal gas combination type high-efficiency low discharge grate firing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202993174U true CN202993174U (en) | 2013-06-12 |
Family
ID=48564351
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220647020 Expired - Fee Related CN202993174U (en) | 2012-11-30 | 2012-11-30 | Fire coal gas combination type high-efficiency low discharge grate firing device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980174A (en) * | 2012-11-30 | 2013-03-20 | 山东大学 | Coal-gas combined efficient low-emission grate firing combustion apparatus and technology |
| CN104197316A (en) * | 2014-09-11 | 2014-12-10 | 衡阳衡锅锅炉有限公司 | Gas-solid dual-fuel boiler |
| CN109647158A (en) * | 2019-02-28 | 2019-04-19 | 兖矿集团有限公司 | A kind of circulating fluidized bed boiler flue gas desulfurization and denitrification system and its processing method |
-
2012
- 2012-11-30 CN CN 201220647020 patent/CN202993174U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980174A (en) * | 2012-11-30 | 2013-03-20 | 山东大学 | Coal-gas combined efficient low-emission grate firing combustion apparatus and technology |
| CN104197316A (en) * | 2014-09-11 | 2014-12-10 | 衡阳衡锅锅炉有限公司 | Gas-solid dual-fuel boiler |
| CN109647158A (en) * | 2019-02-28 | 2019-04-19 | 兖矿集团有限公司 | A kind of circulating fluidized bed boiler flue gas desulfurization and denitrification system and its processing method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20171130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |