CN1963298A - Combustion technology for removing low NOx by using superfine powdered coal in re-combustion zone - Google Patents
Combustion technology for removing low NOx by using superfine powdered coal in re-combustion zone Download PDFInfo
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- CN1963298A CN1963298A CNA2005100476625A CN200510047662A CN1963298A CN 1963298 A CN1963298 A CN 1963298A CN A2005100476625 A CNA2005100476625 A CN A2005100476625A CN 200510047662 A CN200510047662 A CN 200510047662A CN 1963298 A CN1963298 A CN 1963298A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention provides a burning technique of removing Nox from the burnt articles by using an ultra fine coal powder as the reductor. The hearth is separated into three zones, namely the major burning zone, the reburning zone and the burnt zone, with the major burning zone using usual coal powder, heat emission rating 80-85% of the total heat input, coal burning in rich oxygen environment and the excess air coefficient 1.0 - 1.1. The ultra fine coal powder reburning zone has reburning fuel ejector and major burning fuel ejector separated and independent on the top of the major burning zone, with the ultra fine coal powder reburning fuel taking on an extra 15-20% of the total heat input of the system, forming a minor rich fuel zone by sufficient fuels ejected into at the downstream of the major burning area, the Nox being changed into N2, and the air excess coefficient 0.85-0.95. Above the reburning area, special wind is formed into a burnt zone to ensure the complete put out of incompletely burnt fuels at the reburning zone outlet. It is poor fuel environment in the burnt zone with air excess coefficient 1.1-1.2. It excels with the reburning taking place without greatly influencing the running of the boiler, no other by product released after the reburning, and no significant affect to the boiler running when remodeling the old boiler.
Description
Technical field:
The present invention relates to combustion technology, provide a kind of superfine powdered coal to fire low NOx combusting technology more especially.
Background technology:
Coal resources occupy consequence in Chinese primary energy constitutes, account for 90% of present explored fossil energy resource.According to scholarly forecast, by 2010, coal still accounted for about 60% in the Chinese primary energy structure of consumer demand, to the year two thousand fifty coal will account for about 50%, that is to say the Chinese variation that in considerable time, does not have essence based on the production of energy and the consumption structure of coal.
China has caused the severe exacerbation of atmosphere quality based on the energy consumption structure of coal, and we are paid through the nose.Although positive effort is made at aspects such as comprising the management of enlarged link environment pollution by this several years Chinese government, the energy industry of China still is faced with three big main tasks of structural adjustment, environmental pollution improvement and energy security supply.
The control task of China's coal-burning power plant's discharged nitrous oxides is also quite arduous and heavy.Late 1990s, Chinese thermoelectricity NO
xThe discharging scale is about 4.3g/KWh, apparently higher than world developed country level.It is predicted, if keep emission level in 2000, to the year two thousand thirty, annual NO
xDischarge capacity will reach 9,120,000 tons.The technology that has large quantities of energy to be fit to China's actual conditions in the field that reduces nitrogen oxide is badly in need of exploitation.Therefore strengthen the development of China's coal-burning power plant's green technology,, satisfy the requirement that national economy continues, develops in a healthy way, improve China's atmospheric environment, improve aspects such as people's living standard, all have very important significance for optimizing China's energy resource structure.
According to " thermal power plant's atmosphere pollutants emission standards " of the up-to-date announcement of State Environmental Protection Administration (GB13223-2003), since 2004, discharging had new regulation again to power plant boiler NOx, promptly uses the V of coal
Daf＜10% boiler, its NO
xDischarging is less than 1100mg/m
3Use 10%＜V of coal
Daf＜20% boiler, its NO
xDischarging is less than 650mg/m
3Use the V of coal
Daf＞20% boiler, its NO
xDischarging is less than 450mg/m
3Simultaneously, to NO
xThe fine of discharging is also strict more, and regulation begins charge by discharging zero starting point, and fine lines are increased to 0.6 yuan/equivalent by 0.2 yuan/equivalent of regulation.New environmental protection policy is strict more to thermal power plant NO
xThe requirement of discharging.Therefore, in conjunction with the national conditions of China based on the coal electricity, under present economic development situation, the effectively low NO of exploitation
xCombustion technology will have very important social benefit and economic benefit in future.
Summary of the invention:
The purpose of this invention is to provide a kind of NO that reduces in the flue gas
xCombustion technology, it is used for the combustion system of coal-fired power station boiler, reaches to reduce NO
x50% combustion technology.
A kind of superfine powdered coal provided by the invention fires low NO again
xCombustion technology be a kind of utilize superfine powdered coal as reducing agent with NO
xThe combustion technology of from combustion product, removing.Burner hearth is divided into primary zone, reburning zone and three zones of burning-out zone from bottom to top, and the conventional pulverized-coal combustion technology is adopted in the primary zone, and the reburning zone sprays into superfine powdered coal and forms little fuel rich area, and burning-out zone is sent into after-flame wind.
The primary zone is the conventional pulverized-coal combustion zone, and this regional heat is released to 80～85% of combustion system net quantity of heat input, and the burning of coal dust is burnt in the environment of oxygen enrichment, and the excess air factor in the primary zone is 1.0～1.1, the NO that the primary zone generates
xMain component be NO;
The reburning zone is the superfine powdered coal combustion zone, the reburning fuel spout separates with main combustion fuel nozzle ports and is independent of the top, primary zone, reburning fuel is a superfine powdered coal, reburning fuel accounts for other 15～20% of system's net quantity of heat input, in the downstream, primary zone by capacity spray into to form a little fuel rich area, the here NO in primary zone
xBe reduced.In the reburning zone, the hydrocarbon radical that produces in the reburning fuel decomposable process, CH for example, with the nitrogen substance hydrogen cyanide (HCN) for example that the NO molecule in primary zone reacts and generates other, then HCN is through reaction intermediate NCONHN, and constantly decay finally generates N
2Excess air factor in the reburning zone is 0.85～0.95;
The top, reburning zone arranges that after-flame wind to form burning-out zone, guarantees the imperfect combustion product after-flame of reburning zone outlet, is poor fuel environment in burning-out zone, and the excess air factor in the burning-out zone is 1.1～1.2;
In order to reach the best excess air coefficient in reburning zone, just require the primary zone under condition, to move near theoretical air requirement, the more satisfactory operation conditions in primary zone is that excess air coefficient is controlled at 1.1 or level more still less, when the after-flame of stability of burning and carbon was not affected substantially, lower excess air coefficient can be adopted in the primary zone.At burning-out zone, after-flame wind adds burner hearth makes stoichiometric ratio when whole burner hearth combustion system reaches its normal operation.
The temperature of burner hearth was to NO when reburning fuel sprayed into
xReduction efficiency is influential, and the reburning zone needs enough temperature of high burner hearth, is easier to carry out with carbon monoxide and the OXIDATION OF HYDROCARBONS ratio that guarantees the reburning zone.Therefore reburning fuel should be as much as possible from the position ejection near the primary zone, however reburning fuel must above the primary zone, spray into a distance, this distance will guarantee the time of staying that the primary zone is enough, makes the volatile hydrocarbon after-flame in the main flame.For most combustion system, the time of staying of reburning zone should be at the 300-500 millisecond.Burning-out zone also needs to guarantee enough time of staying, so that carbon monoxide that comes out in the reburning zone and hydrocarbon after-flame.
The ratio of the required total air capacity of total air capacity that the excess air factor of reburning zone provided by the present invention is defined as supplying with primary zone and reburning zone and primary zone and reburning zone fuel;
Superfine powdered coal provided by the present invention its fineness for the conventional pulverized-coal fineness that general pulverized coal furnace of hydropower station burnt is thinner, and the fineness of superfine powdered coal is 80% standard screen by 325 purposes for bituminous coal.
With other NO
xControl technology is compared, and the superfine powdered coal major advantage of combustion technology again is:
Combustion is a kind of senior low NO again
xCombustion technology is at other low NO
xGrow up on the combustion technology basis;
Combustion can be carried out under the situation that boiler operatiopn is not caused appreciable impact again;
Combustion does not produce other byproduct discharging again.NO with other adding type
xControl procedure is urea or ammonia-method denitration difference for example, fires the generation that process can not cause other pollutant and ammonia and nitrous oxide again;
Can not cause remarkable influence when transforming old boiler to boiler operatiopn.
Description of drawings:
Fig. 1 is low NO for superfine powdered coal provided by the invention fires again
xThe principle schematic of combustion technology.
Fig. 2 is for the invention provides embodiment sets of burners schematic diagram.
The specific embodiment:
Embodiment 1
The schematic diagram that superfine powdered coal provided by the invention fires low NOx combusting technology more as shown in Figure 1.By burner hearth, burner and spout are formed, be furnished with burner on four jiaos in the burner hearth, counterclockwise organize tangential firing, sets of burners schematic diagram on one of them angle as shown in Figure 2, burner hearth is divided into the primary zone from bottom to top, three zones of reburning zone and burning-out zone, the primary zone burner hearth is furnished with A for four jiaos, B, C, D, E, six layers of tilting burner of F, arrange one at interval, overfire air port is arranged at interval, one time wind snout can swing up and down each 20 °, overfire air port can be done each swing of 30 ° up and down, adopt big bellows structure, by dividing plate big bellows are separated into 6 air compartments, spray into conventional pulverized-coal by a wind snout, spray into the burning required air by overfire air port, this regional heat is released to 80% of combustion system net quantity of heat input, the air capacity of input accounts for 75% of total blast volume, make that the excess air factor in the primary zone is about 1.1, superfine powdered coal sprays into burner hearth by separating the reburning fuel spout that is independent of the top, primary zone with main combustion fuel nozzle ports, form the reburning zone, the reburning fuel spout can swing up and down each 20 °, reburning fuel accounts for other 20% of system's net quantity of heat input, excess air factor in the reburning zone is about 0.9, residue 25% air quantity of total blast volume caused fire the spout top again and spray into burner hearth, realize the completing combustion of fuel as after-flame wind, the after-flame wind snout is divided into three layers also can upwards swing 5 °, to 15 ° of lower swings, the swing of after-flame wind both can have been adjusted the height of burning-out zone like this, changed coal dust particle in the time of staying in this district, can play the effect of regulating steam temperature.
By the supply stage by stage of such air, fuel, make primary zone fuel in the environment of oxygen enrichment, burn, belong to oxidizing atmosphere, spray into superfine powdered coal in the reburning zone, form a little fuel rich area, the here NO in primary zone
xBe reduced, for finishing whole combustion processes, the required remaining air of completing combustion sprays into from the top, reburning zone, mixes with the flue gas that produces under the reburning zone oxygen deprivation condition, finishes whole combustion processes.
The result: the NOx discharging in the flue gas can reach 350mg/Nm
3The level of (the conversion oxygen content is 6% in the flue gas) is compared its NOx reduced rate with the routine burning and has been reached more than 50%.
Claims (4)
1, a kind of superfine powdered coal fires low NO again
xCombustion technology, its characteristics are: burner hearth is divided into primary zone, reburning zone and three zones of burning-out zone from bottom to top, and the conventional pulverized-coal combustion technology is adopted in the primary zone, and the reburning zone sprays into superfine powdered coal and forms little fuel rich area, and burning-out zone is sent into after-flame wind;
The primary zone is the conventional pulverized-coal combustion zone, and this regional heat is released to 80～85% of combustion system net quantity of heat input, and the burning of coal dust is carried out in the environment of oxygen enrichment, and the excess air factor in the primary zone is 1.0～1.1, the NO that the primary zone generates
xMain component be NO;
The reburning zone is the superfine powdered coal combustion zone, the reburning fuel spout separates with main combustion fuel nozzle ports and is independent of the top, primary zone, reburning fuel is a superfine powdered coal, reburning fuel accounts for other 15～20% of system's net quantity of heat input, in the downstream, primary zone by capacity spray into to form a little fuel rich area, the here NO in primary zone
xBe reduced into N
2Excess air factor in the reburning zone is 0.85～0.95;
The top, reburning zone arranges that after-flame wind to form burning-out zone, guarantees the imperfect combustion product after-flame of reburning zone outlet, is poor fuel environment in burning-out zone, and the excess air factor in the burning-out zone is 1.1～1.2.
2, fire low NO again according to the described superfine powdered coal of claim 1
xCombustion technology is characterized in that: the excess air factor of described reburning zone is the ratio of the required total air capacity of total air capacity of supplying with primary zone and reburning zone and primary zone and reburning zone fuel.
3, fire low NO again according to the described superfine powdered coal of claim 1
xCombustion technology is characterized in that: described superfine powdered coal its fineness for the conventional pulverized-coal fineness that general pulverized coal furnace of hydropower station burnt is thinner.
4, fire low NO again according to the described superfine powdered coal of claim 3
xCombustion technology is characterized in that: the fineness of described superfine powdered coal is 80% standard screen by 325 purposes for bituminous coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100476625A CN1963298A (en) | 2005-11-08 | 2005-11-08 | Combustion technology for removing low NOx by using superfine powdered coal in re-combustion zone |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100476625A CN1963298A (en) | 2005-11-08 | 2005-11-08 | Combustion technology for removing low NOx by using superfine powdered coal in re-combustion zone |
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| CN1963298A true CN1963298A (en) | 2007-05-16 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003701A (en) * | 2010-11-23 | 2011-04-06 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| CN102338375A (en) * | 2010-12-20 | 2012-02-01 | 武汉华是能源环境工程有限公司 | Multi-coal low-nitrogen direct-current coal dust combustion device |
| CN102620284A (en) * | 2012-04-10 | 2012-08-01 | 哈尔滨工业大学 | Boiler device with cyclone pulverized coal burners in unequal-interval arrangement |
| CN102878550A (en) * | 2012-10-12 | 2013-01-16 | 浙江大学 | Method for water-coal-slurry burning slag tapping cyclone furnace classification air distribution and low NOx reburning |
| CN107314366A (en) * | 2017-08-17 | 2017-11-03 | 上海华之邦科技股份有限公司 | A kind of π type gas fired-boilers of use Secondary Air technology |
| CN109869712A (en) * | 2019-02-28 | 2019-06-11 | 兖矿集团有限公司 | A kind of modified coal fires the system and its processing method of desulphurization denitration again |
| CN111023095A (en) * | 2019-11-11 | 2020-04-17 | 河北宏龙环保科技有限公司 | Ultralow-nitrogen combustion system and control method thereof |
| CN113669754A (en) * | 2021-08-16 | 2021-11-19 | 华北电力科学研究院有限责任公司 | Method and system for determining real-time heat release of fuel at outlet of combustor |
-
2005
- 2005-11-08 CN CNA2005100476625A patent/CN1963298A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003701B (en) * | 2010-11-23 | 2012-12-26 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| CN102003701A (en) * | 2010-11-23 | 2011-04-06 | 浙江大学 | Low NOx coal dust combustion method and device based on underfire air and overfire air |
| CN102338375A (en) * | 2010-12-20 | 2012-02-01 | 武汉华是能源环境工程有限公司 | Multi-coal low-nitrogen direct-current coal dust combustion device |
| CN102620284B (en) * | 2012-04-10 | 2014-10-15 | 哈尔滨工业大学 | Boiler device with cyclone pulverized coal burners in unequal-interval arrangement |
| CN102620284A (en) * | 2012-04-10 | 2012-08-01 | 哈尔滨工业大学 | Boiler device with cyclone pulverized coal burners in unequal-interval arrangement |
| CN102878550B (en) * | 2012-10-12 | 2015-04-15 | 浙江大学 | Method for water-coal-slurry burning slag tapping cyclone furnace classification air distribution and low NOx reburning |
| CN102878550A (en) * | 2012-10-12 | 2013-01-16 | 浙江大学 | Method for water-coal-slurry burning slag tapping cyclone furnace classification air distribution and low NOx reburning |
| CN107314366A (en) * | 2017-08-17 | 2017-11-03 | 上海华之邦科技股份有限公司 | A kind of π type gas fired-boilers of use Secondary Air technology |
| CN109869712A (en) * | 2019-02-28 | 2019-06-11 | 兖矿集团有限公司 | A kind of modified coal fires the system and its processing method of desulphurization denitration again |
| CN111023095A (en) * | 2019-11-11 | 2020-04-17 | 河北宏龙环保科技有限公司 | Ultralow-nitrogen combustion system and control method thereof |
| CN111023095B (en) * | 2019-11-11 | 2021-03-23 | 河北宏龙环保科技有限公司 | Ultralow-nitrogen combustion system and control method thereof |
| CN113669754A (en) * | 2021-08-16 | 2021-11-19 | 华北电力科学研究院有限责任公司 | Method and system for determining real-time heat release of fuel at outlet of combustor |
| CN113669754B (en) * | 2021-08-16 | 2023-06-30 | 华北电力科学研究院有限责任公司 | Method and system for determining real-time heat release amount of fuel at outlet of combustor |
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