CN1301382C - Method for using solid/liquid coal double fuel for circulation fluidized bed boiler - Google Patents
Method for using solid/liquid coal double fuel for circulation fluidized bed boiler Download PDFInfo
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- CN1301382C CN1301382C CNB200410021229XA CN200410021229A CN1301382C CN 1301382 C CN1301382 C CN 1301382C CN B200410021229X A CNB200410021229X A CN B200410021229XA CN 200410021229 A CN200410021229 A CN 200410021229A CN 1301382 C CN1301382 C CN 1301382C
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- 239000003245 coal Substances 0.000 title claims abstract description 68
- 239000000446 fuel Substances 0.000 title claims abstract description 47
- 239000007788 liquid Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007787 solid Substances 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 50
- 239000002002 slurry Substances 0.000 claims abstract description 19
- 239000010802 sludge Substances 0.000 claims abstract description 13
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000003250 coal slurry Substances 0.000 claims description 55
- 239000002817 coal dust Substances 0.000 claims description 29
- 239000012530 fluid Substances 0.000 claims description 24
- 238000002485 combustion reaction Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000005243 fluidization Methods 0.000 claims description 4
- 239000002351 wastewater Substances 0.000 claims description 4
- 235000019738 Limestone Nutrition 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000004449 solid propellant Substances 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 239000010865 sewage Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 238000002156 mixing Methods 0.000 abstract description 2
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- 238000009835 boiling Methods 0.000 abstract 1
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- 238000005516 engineering process Methods 0.000 description 8
- 239000006004 Quartz sand Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000003203 everyday effect Effects 0.000 description 3
- 238000004537 pulping Methods 0.000 description 3
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- 230000002503 metabolic effect Effects 0.000 description 2
- 238000012946 outsourcing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
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Abstract
The present invention relates to a method for burning solid and liquid coal property dual fuel in a circulating fluidized bed boiler, and belongs to the technical field of a fluidized bed which can simultaneously burn two fuels. The boiler is provided with a nodulizer, a screw stoker and a dual fuel auxiliary feeding device, wherein coal water slurry is added in the nodulizer; coal powder, coal gangue powder or mixture coal powder which is made of burnable refuse are added in the screw stoker. The pressure of a slurry supplying pump of the coal water slurry is 0.2 to 0.4MPa. When the two fuels are simultaneously added, the total distribution ratio of water coal powder and the coal powder or the coal gangue powder is 3: 7 to 4: 6. When the mixed coal powder is added, the burnable refuse amount in the fuels is 5-20% of the total amount of the coal powder. The expansion ratio of the fluidized bed is 1.5 to 2.1, operation gas speed is 3 to 7 m/s, and circulation rate is 6 to 8. Boiling pressure difference is 4500 to 6000Pa, and burning temperature is 800 to 950 DEG C. The burning technological process comprises three different cases with the coal water slurry, without coal water slurry and with the mixing coal powder, and original coal powder adding amount is mainly regulated based on the height of the bed layer and the furnace temperature. The present invention can burn standard coal water slurry or the coal water slurry which is made of sludge and waste liquid. The slurry supplying pump is a diaphragm pump, a screw pump or a centrifugal pump, and the screw pump is better used.
Description
Technical field
The invention belongs to the fluidized bed combustion technology field of the two kinds of fuel that burn simultaneously according to International Patent Classification (IPC), specially refer to a kind of use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method.
Background technology
Present CFBB all is a kind of fuel that only uses in coal, gangue or the water-coal-slurry.Use the unicity of fuel to have influence on the boiler user, can not be with burn organic matter in combustiblerefuse, waste liquid and the mud of coal-burning boiler.And realized using the CFBB that waste liquid and mud are made water-coal-slurry, exist boiler again and when operation, need in burner hearth, add quartz sand and do fluidizing agent.Because the hardness height of quartz sand own to the hearth wall erosive wear, seriously affects the life-span of boiler in the fluidised form process, increased the problem of boiler operatiopn and maintenance cost.In addition, if when the water-coal-slurry lazy weight, boiler can not burn coal just can't be again to production supply steam, hot water.Coal is become water-coal-slurry, and the technology of making water-coal-slurry with waste liquid and mud also solves; But this use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method does not still have so far.
Summary of the invention
The present invention proposes a kind of use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method at the problems referred to above.Realize this function must be to circulating fluid bed boiler body, supply with fuel system and transform, work out a kind of use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method.The present invention is made up of auxiliary feed system of circulating fluid bed boiler body feeding device, fuel and the technology that matches.
1, circulating fluid bed boiler body feeding device
The CFBB feeding device as shown in Figure 1, by CFBB 1, water-coal-slurry pelletizer 2, mixed coal powder storehouse 3, coal or colliery powder storehouse 4, screw-type coal distributor 5 is formed.In upper boiler water-coal-slurry pelletizer 2 is installed, in boiler, is added water-coal-slurry by its low pressure; Simultaneously screw-type coal distributor 5 has been installed in the boiler bottom.Two feed bins are installed on screw-type coal distributor, the coal charge metering device of sealing is housed under feed bin, control and add which kind of fuel, add how much fuel.A feed bin is being adorned the former coal dust or the colliery powder that will add, another kind of feed bin is being adorned the mixed coal powder of being made by the combustiblerefuse after the fragmentation, outside also kept self-conveyor feed and the feed bin that boiler is supplied with agstone.
2, the auxiliary feed system of fuel
It constitutes the auxiliary feed system of fuel as shown in Figure 2, the water-coal-slurry or the homemade water-coal-slurry of outsourcing are stored in the coal slurry storage tank, coal slurry can be standard merchandise water-coal-slurry or the waste water cws that utilizes the paper mill waste liquid, or the sludge water-coal-slurry that utilizes the mud in the mud of municipal sewage plant or paper mill to make.
If by mud or waste liquid, former coal dust self-control water-coal-slurry, pulping equipment will be set, make water-coal-slurry with former coal dust, mud or waste liquid and additive.Make water-coal-slurry good or outsourcing and be stored in the jar, mixing plant is installed on basin top, regularly water-coal-slurry is stirred, prevent the water-coal-slurry precipitation.Water-coal-slurry supplies slurry from the outlet under the basin via slurry supply pump.This pump can be screw pump, membrane pump or centrifugal pump or slush pump, and the supporting with it constant voltage quantitative control system that also is provided with is realized the constant voltage weight feed.From for slurry steadily, the angle of long service life sees that water-coal-slurry is sent to upper boiler, through water-coal-slurry pelletizer adding boiler to adopt screw pump for well.
The mixed coal powder that in boiler, adds, with combustiblerefuse and former coal dust is feedstock production, the preparation method is: combustiblerefuse drying, screening, back in small, broken bits are mixed with former coal dust, the combustiblerefuse amount that adds is for adding 5～20% of former coal dust total amount, make mixed coal powder, its granularity is controlled at 0～10mm.When boiler is supplied with mixed coal powder fuel, mixed coal powder is sent in the mixed coal powder feed bin of boiler screw stoker.
3, use the technology of two kinds of ature of coal fuel of burning in circulating fluid bed boiler solid, liquid
The pressure for slurry of water-coal-slurry slurry supply pump is 0.2～0.4MPa.The coal or the colliery powder granularity that add fluidized-bed combustion boiler are 0～10mm, have formed fluidizing agent with the material that cyclone separator returns.Can supply with solid fuel and two kinds of fuel of liquid fuel simultaneously in CFBB, liquid fuel is a water-coal-slurry, and solid fuel is coal dust or colliery powder.Saved quartz sand and done fluidizing agent, formed fluidizing agent by coal dust or colliery powder, the lime stone powder that returns material, adding; Its hardness is little, and the wearing and tearing of boiler fluid bed furnace wall are greatly alleviated.Boiler fluidized bed material static height is 500～800mm, fluidization height 750～2400mm, and the bed expansion ratio is 1.5～2.0.The fluidized bed combustion temperature is controlled between 800 ℃～950 ℃, fluidized-bed layer pressure reduction: 4500～6000Pa, and circulating ratio is 6～8, is the low range circulation; Can calculate the height of fluid bed concentrated phase area by differential manometer, keep such one more stably fluid bed concentrated phase area height be very important; It is to guarantee the boiler even running, the fuel normal combustion, and boiler normally produces the necessary condition of steam and hot water.
Water-coal-slurry is transported to upper boiler by slurry supply pump, need not filter, high-pressure atomization, the dilute-phase zone that is sprayed onto under 0.2～0.4Mpa pressure in the boiler by the water-coal-slurry pelletizer combines with flue gas and the flying dust that fluid bed rises, the moisture content volatilization, coal tar changes into for fine particle group, suspension combustion in boiler; And the particle that increases enters the fluidized combustion of fluid bed concentrated phase area.The heat that two kinds of fuel of the coal dust of upper water coal slurry and bottom burn simultaneously and produce converts heat to by the superheater boiler tube at boiler water-wall tube and top.Owing to 800～950 ℃ of the ignition temperatures of having controlled boiler furnace, suppressed heating power type NO
xGeneration discharging, the lime stone powder of adding is direct desulfurization in combustion process again.According to the boiler combustion principle, at technology establishment the user mode of two kinds of fuel, its technological principle block diagram is as shown in Figure 3.According to this process frame chart, control the supply and the supply of various fuel automatically by the computer compilation control program, and reasonably cooperate mutually.
(1) under the situation that water-coal-slurry, mixed coal powder are arranged, earlier the water-coal-slurry addition is set, again the quantity delivered of the mixed coal powder that adds is set, then according to the demand of boiler heat supplying to fuel quantity, adjust the quantity that adds former coal dust or colliery powder, the allocation proportion that makes water-coal-slurry and coal dust or colliery powder is 3: 7 to 4: 6, former coal dust or colliery powder and mixed coal powder add fashionable simultaneously, and the combustiblerefuse amount that adds along with mixed coal powder is 5～20% of a coal dust total amount.Outside also to the addition of former coal dust be adjusted according to the demand of heat supply in this moment boiler, the condition of its adjustment is:
The required fluidisation bed depth of a, fluid bed concentrated phase area;
The amount and the mixed coal powder amount of b, adding water-coal-slurry;
The requirement that c, boiler furnace ignition temperature are 800～950 ℃.
(2) not having in that water-coal-slurry is arranged under the situation of mixed coal powder, also is to be 3: 7 to 4: 6 values with the constant back of water-coal-slurry addition according to the allocation proportion of water-coal-slurry and coal dust or colliery powder earlier and to adjust with following three conditions:
The required fluidisation bed depth of a, fluid bed concentrated phase area;
The amount of b, adding water-coal-slurry;
The requirement that c, boiler furnace ignition temperature are 800～950 ℃;
Adjust the quantity that adds former coal dust or colliery powder.
When boiler normally moves, often do to have or not the judgement of water-coal-slurry.Enter (1), (2) two kinds of programs if any water-coal-slurry.In a big time period, as be defined as 10-14 hour metabolic water coal slurry in one day 24 hours in service this adjustment basic fixed of boiler; Also do local adjustment simultaneously possibly, make the time lengthening or the shortening of metabolic water coal slurry.Handle like this, both guaranteed boiler steady heat supply in 24 hours, can handle combustiblerefuse, sludge water-coal-slurry or waste water cws immediately again.Accomplished that environmental protection production neglects neither, realized high performance clean burning.If the load of boiler need be adjusted the quantity that can adjust fuel; Make boiler stable operation in 30～110% rated load scope.
Description of drawings
Fig. 1: double fuel CFBB feeding device figure;
Fig. 2: a kind of flow chart that uses burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method;
Fig. 3: use burning in circulating fluid bed boiler solid, liquid ature of coal double fuel technology controlling and process block diagram.
The specific embodiment
Certain paper mill needs 2 35 tons of/hour steam boilers, and this paper mill produces and produces 45 tons in mud, 50 tons of combustiblerefuses (mainly being plastics) every day.2 35 tons of/hour circulation of fluid beds boiler erection in this paper mill solid, liquid double fuel feedway of the present invention.1 pulping tank and 1 slurry can are installed in this paper mill, and the same coal dust of paper mill sludge, papermaking wastewater and additive are added in the pulping tank in proportion, make the sludge water-coal-slurry that calorific value is 17000～19000kJ/kg, sludge water-coal-slurry are transported in the slurry can store.
The combustiblerefuse that produces in the paper production is utilized residual heat from boiler fume oven dry, screening by drying plant, be mixed and made into mixed coal powder with coal dust after crushed again, its granularity is 0～10mm.Coal dust, mixed coal powder are delivered in the coal bunker and mixed coal powder storehouse on the boiler by conveying equipment, sent into the burner hearth internal combustion by screw-type coal distributor.Two feed bin bottoms the powder doser of sealing is housed, is equipped with the quantitative control system of control screw stoker, constituted the reinforced control system of solid coal powder fuel, realize the various coal dust amounts of total adding and the dosing of each fuel charge amount.Water-coal-slurry is delivered to from slurry can on the water-coal-slurry pelletizer of upper boiler with the pressure of 0.3MPa by screw pump, adds the sludge water-coal-slurry of institute's required amount by it in boiler.Be provided with constant voltage weight feed control system and metering system before and after screw pump, the metering control system of these two kinds of fuel is regulated and control by computer, presses accompanying drawing 3 described technology controlling and process programs and adds water-coal-slurry and various coal dust.The process conditions of fluidized-bed combustion boiler are: fluid bed bed of material static height 500～700mm, fluid bed concentrated phase area height is 1000～1300mm, and the bed expansion ratio is 1.7～1.85, and fluidized-bed layer pressure reduction is 4500～5500Pa, adopting circulating ratio is 6～7,850～900 ℃ of burner hearth internal combustion temperature.The supply ratio of sludge water-coal-slurry and total coal dust amount is 4: 6.Former Pulverized Coal degree is 0～10mm, and quantity delivered is 53% of total fuel quantity weight ratio, and the mixed coal powder granularity also is 0～10mm, and quantity delivered is 47% of total fuel quantity weight ratio, and the combustiblerefuse weight ratio is 24% in mixed coal powder.Boiler hourly worker's every days 24 is as the paper mill steam supply like this.The time that has 14 hours every day is to add sludge water-coal-slurry and coal dust in boiler simultaneously, and all the other 10 hours for adding a kind of fuel of former coal dust.Burn every day 25 tons of sludge water-coal-slurries, 60 tons of burning mixed coal powders, 52 tons of the former coal dusts of burning, 15 tons of burning combustiblerefuses, outside burn again 63 tons of former coal dusts.Boiler operatiopn is steadily reliable, production is normal, and can in a period of time exerting oneself of boiler be brought up to 110% of former rated power.
Solid, liquid ature of coal dual-fuel combustion method has been adopted in this paper mill on CFBB, guaranteeing to produce a processing difficult problem that has solved this factory's paper mill sludge and combustiblerefuse with the condition of heat simultaneously, and the quartz sand expense of having saved the expense of handling mud and rubbish and need add during the burning sludge water-coal-slurry separately, reduced boiler internal wearing and tearing, prolonged service life of boiler.
Claims (3)
1, a kind of use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method, it is characterized in that supplying with solid-state and liquid two kinds of fuel simultaneously to CFBB, liquid fuel is a water-coal-slurry, solid fuel is former coal dust or colliery powder or mixed coal powder, the water-coal-slurry slurry supply pump is 0.2～0.4MPa for slurry pressure, the coal powder size that adds CFBB is 0～10mm, has formed fluidizing agent by coal dust or colliery powder, the lime stone powder that returns material, adding; Boiler fluidized bed material static height is 500～800mm, fluidization height 750～2400mm, and the bed expansion ratio is 1.5～2.0, and the fluidized bed combustion temperature is controlled between 800 ℃～950 ℃, and fluidized-bed layer pressure reduction is 4500～6000Pa, and circulating ratio is 6～8.
2, use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method according to claim 1, it is characterized in that described water-coal-slurry is standard merchandise water-coal-slurry or the waste water cws that utilizes the paper mill waste liquid to make, or the sludge water-coal-slurry that utilizes the mud in the mud of municipal sewage plant or paper mill to make.
3, use burning in circulating fluid bed boiler solid, liquid ature of coal dual-fuel method according to claim 1, it is characterized in that described mixed coal powder is a feedstock production with combustiblerefuse and former coal dust, the preparation method is: combustiblerefuse drying, screening, back in small, broken bits are mixed with former coal dust, the combustiblerefuse amount that adds is for adding 5～20% of former coal dust total amount, make mixed coal powder, its granularity is controlled at 0～10mm.
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| CNB200410021229XA CN1301382C (en) | 2004-04-06 | 2004-04-06 | Method for using solid/liquid coal double fuel for circulation fluidized bed boiler |
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| CNB200410021229XA CN1301382C (en) | 2004-04-06 | 2004-04-06 | Method for using solid/liquid coal double fuel for circulation fluidized bed boiler |
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| CN1301382C true CN1301382C (en) | 2007-02-21 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191089B (en) * | 2006-11-22 | 2013-07-10 | 张大伟 | Sludge and coal mixing fuel and using method thereof |
| CN101694299A (en) * | 2009-10-21 | 2010-04-14 | 吴跃平 | Method for eliminating sludge through combustion |
| CN102032554B (en) * | 2010-12-13 | 2012-05-23 | 青岛海众环保锅炉股份有限公司 | Coal water slurry and coal water slurry powder combusting hybrid boiler |
| CN102721036B (en) * | 2011-03-29 | 2014-04-16 | 厦门鸿益顺环保科技有限公司 | Coal-water slurry boiler steam supply engineering system provided with self-adapting three-control function |
| CN103175195A (en) * | 2011-12-23 | 2013-06-26 | 青岛特利尔环保锅炉工程有限公司 | Suspension type fluidized combustion process for preparing coal water slurry from industrial sewage |
| CN103104929B (en) * | 2012-12-13 | 2016-03-30 | 青岛特利尔环保股份有限公司 | Mud coal fuel-efficient clean combustion method and circulation suspension fluidization boiler |
| CN103175208B (en) * | 2013-03-08 | 2015-12-30 | 浙江大学 | The polymorphic hazardous waste burn system of solid-liquid and method thereof are put in fluid bed coexistence |
| CN104251496B (en) * | 2013-12-25 | 2018-08-21 | 山东尧舜热能科技有限公司 | A kind of coal slime incinerator |
| CN114923170A (en) * | 2022-06-17 | 2022-08-19 | 神华准格尔能源有限责任公司 | Method for adjusting bed temperature of circulating fluidized bed boiler |
| CN116481021A (en) * | 2023-05-17 | 2023-07-25 | 哈尔滨红光锅炉总厂有限责任公司 | Environment-friendly energy-saving circulating fluidized bed boiler capable of respectively burning coal and coal water slurry |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115489A (en) * | 1981-01-05 | 1982-07-17 | Jiro Sasaoka | Fluidized bed treating apparatus of carbonaceous material |
| JPS61165506A (en) * | 1984-12-19 | 1986-07-26 | フオスタ−・ホイ−ラ−・エナ−ジイ・コ−ポレイシヨン | Fuel feeder for fluidized bed reactor |
| CN1058084A (en) * | 1991-07-02 | 1992-01-22 | 浙江大学 | The flowing bed mixed burning technology of coal washing mud and gangue |
| GB2381572A (en) * | 1998-11-24 | 2003-05-07 | Nippon Kokan Kk | Incineration of waste plastics with sludge |
-
2004
- 2004-04-06 CN CNB200410021229XA patent/CN1301382C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57115489A (en) * | 1981-01-05 | 1982-07-17 | Jiro Sasaoka | Fluidized bed treating apparatus of carbonaceous material |
| JPS61165506A (en) * | 1984-12-19 | 1986-07-26 | フオスタ−・ホイ−ラ−・エナ−ジイ・コ−ポレイシヨン | Fuel feeder for fluidized bed reactor |
| CN1058084A (en) * | 1991-07-02 | 1992-01-22 | 浙江大学 | The flowing bed mixed burning technology of coal washing mud and gangue |
| GB2381572A (en) * | 1998-11-24 | 2003-05-07 | Nippon Kokan Kk | Incineration of waste plastics with sludge |
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