CN101725965A - High-temperature fume furnace of circulating fluidized bed and control method thereof - Google Patents

High-temperature fume furnace of circulating fluidized bed and control method thereof Download PDF

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Publication number
CN101725965A
CN101725965A CN200810224612A CN200810224612A CN101725965A CN 101725965 A CN101725965 A CN 101725965A CN 200810224612 A CN200810224612 A CN 200810224612A CN 200810224612 A CN200810224612 A CN 200810224612A CN 101725965 A CN101725965 A CN 101725965A
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China
Prior art keywords
cyclone separator
fluidized bed
burner hearth
inert gas
circulating fluidized
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CN200810224612A
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CN101725965B (en
Inventor
邵俊杰
万思本
苏晓辉
陈金火
张平
何立新
田天
夏树根
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BEIJING SHENHUA INTERNATIONAL TECHNOLOGY Co Ltd
Shenhua Group Corp Ltd
China Western Power Industrial Co Ltd
Shenhua International Trading Co Ltd
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BEIJING SHENHUA INTERNATIONAL TECHNOLOGY Co Ltd
Shenhua Group Corp Ltd
China Western Power Industrial Co Ltd
Shenhua International Trading Co Ltd
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Priority to CN2008102246123A priority Critical patent/CN101725965B/en
Publication of CN101725965A publication Critical patent/CN101725965A/en
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Abstract

This invention discloses a high-temperature fume furnace of a circulating fluidized bed. The fume furnace comprises a hearth, an air distributor, a pneumatic spreader stroker, a secondary air and inert gas device, a cyclone separator, a feedback unit and a tail flue, wherein the outlet of the air distributor and the spreading opening of the pneumatic spreader stroker are both connected with the hearth; the secondary air and inert gas device is also communicated with the hearth; the outlet of the hearth is connected with the inlet of the cyclone separator; one end of the feedback unit is connected with the solid outlet of the cyclone separator, while the other end thereof is communicated with the hearth; and the tail flue is connected with the gas outlet of the cyclone separator. The high-temperature fume furnace of the circulating fluidized bed of the invention can improve the combustion efficiency and the capacity of the fume furnace, control the combustion temperature of the health, prevent coking in the hearth, and keep the oxygen content of the gas of below 8 percent at the outlet.

Description

High-temperature fume furnace of circulating fluidized bed and control method thereof
Technical field
The present invention relates to the flue gas stove, relate in particular to a kind of high-temperature fume furnace of circulating fluidized bed and control method thereof.
Background technology
The flue gas stove is widely used in operations such as drying, calcining in industrial production.With common ebullated bed flue gas stove of the prior art is example, and on the one hand, ebullated bed flue gas heat size is easily because of fluidizing gas velocity is low, and cloth wind is uneven and cause normally fluidisation of part, thereby " dead " problem occurs; Therefore, generally below 20MW, capacity is difficult to improve the capacity of ebullated bed flue gas stove.On the other hand, the tiny carbon granules that has a large amount of coal ash in the flue gas of generation and do not burn influences efficiency of combustion and flue gas quality.Simultaneously the furnace wall of ebullated bed flue gas stove also exists easy bulge, crackle and shortcoming such as collapse.
In addition, above-mentioned ebullated bed flue gas stove usually adopts high excess air coefficient to control exit gas temperature, and it is higher therefore to export oxygen content of smoke gas, when being used for inflammable and explosive material dry, has certain danger.
Summary of the invention
At the defective of above-mentioned prior art, the objective of the invention is to propose a kind of flue gas stove that can improve fluidizing velocity, improve efficiency of combustion and flue gas heat size.
High-temperature fume furnace of circulating fluidized bed provided by the invention comprises: burner hearth, air-distribution device, strength coal sorting feeder, secondary wind and inert gas installation, cyclone separator, feeding back device and back-end ductwork, wherein, the coal mouth of broadcasting of the air outlet of air-distribution device and strength coal sorting feeder all is communicated with burner hearth; Secondary wind and inert gas installation are communicated with burner hearth; Furnace outlet is connected with the inlet of cyclone separator; Feeding back device one end is connected with the solid outlet of cyclone separator, and the other end is communicated with burner hearth; Back-end ductwork is connected with the gas vent of cyclone separator.
Preferably, secondary wind and inert gas installation communicate with burner hearth at the differing heights of hearth wall.
Preferably, described flue gas stove also comprises the branch matching air box, and by described minute matching air box, described secondary wind and inert gas installation communicated with burner hearth at the differing heights of hearth wall.
Preferably, described minute matching air box comprises the multilayer airway that throughput is different.
Preferably, air-distribution device and strength coal sorting feeder provide wind-force by same high pressure positive blower.
The present invention also provides a kind of high-temperature fume furnace of circulating fluidized bed control method, and described method comprises: a. starts burning; B. in burner hearth, feed secondary wind and inert gas,, oxygen content in the stove is remained on below 8%, temperature in the stove is remained on 800 ℃-950 ℃ by regulating described secondary wind and amount of inert gas; C. the flue gas of furnace outlet is introduced cyclone separator and carry out gas solid separation; D. the flue gas after separating is by the introducing back-end ductwork of cyclone separator, and the isolated coal ash of cyclone separator is sent back to burner hearth through feeding back device.
Preferably, by described minute matching air box, described secondary wind and inert gas fed burner hearth from the differing heights of hearth wall.
Compared with prior art, the present invention has following advantage:
Utilize the cyclone separator of furnace outlet to collect coal ash in the flue gas and the tiny carbon granules that does not burn, circulating combustion in feeding back device is sent stove back to compared with prior art, has improved the burnout rate and the efficiency of combustion of coal.And, send low temperature, low oxygen content inertia circulated air back to burner hearth by inert gas installation, controlled combustion temperature in hearth and outlet oxygen content of smoke gas effectively, avoided coking in the stove, strengthened the gas stream in the stove stirring simultaneously, overheavy firing makes coal abundant in the stove internal combustion.
By minute matching air box low temperature inertia circulating flue gas is fed burner hearth, preferably can spray in the stove at a high speed according to the different branch multilayers of tolerance (for example four layers), can absorb furnace heat like this, keep normal operating temperature (for example about 850 ℃) in the stove, and the outlet oxygen content of smoke gas can be controlled at below 8%.
Description of drawings
Fig. 1 is the high-temperature fume furnace of circulating fluidized bed structural representation of one embodiment of the present invention;
Fig. 2 is the control structure schematic diagram of the high-temperature fume furnace of circulating fluidized bed of one embodiment of the present invention;
Fig. 3 is the air-distribution device schematic diagram of the high-temperature fume furnace of circulating fluidized bed of one embodiment of the present invention;
Fig. 4 is the secondary wind of high-temperature fume furnace of circulating fluidized bed of one embodiment of the present invention and the schematic diagram of inert gas installation;
Fig. 5 is the cyclone separator of high-temperature fume furnace of circulating fluidized bed of one embodiment of the present invention and the schematic diagram of feeding back device.
The specific embodiment
As shown in Figure 1, high-temperature fume furnace of circulating fluidized bed of the present invention comprises burner hearth 1, air-distribution device 2, strength coal sorting feeder 3, secondary wind and inert gas installation 4, cyclone separator 5, feeding back device 6 and back-end ductwork 7.Fig. 2 represents the control structure of high-temperature fume furnace of circulating fluidized bed of the present invention.
Air-distribution device 2 comprises parts such as air distribution plate, blast cap, air compartment, and blast cap and air distribution plate are installed in the isobaric air compartment, introduces in the air compartment by the blast cap that is arranged on the air distribution plate from the gas of source of the gas (for example blower fan), makes the coal fluidized bed combustion.The air outlet of air-distribution device 2 is communicated with burner hearth.Strength coal sorting feeder 3 can utilize blower fan to realize that the coal mouth of broadcasting of strength coal sorting feeder is communicated with burner hearth, and described strength coal sorting feeder is used for coal is evenly broadcast in the stove.
Preferably, can adopt wind apparatus to provide wind-force for air-distribution device 2 and strength coal sorting feeder 3 simultaneously, for example, one time wind apparatus can be high pressure positive blower, except that the fluidisation air quantity that satisfies air-distribution device, a certain amount of coal and fuel oil wind broadcast also is provided, has guaranteed certain combustion share in the emulsion zone.
The present invention adopts secondary wind and inert gas installation 4 to provide secondary wind and inert gas for the flue gas stove.The blower fan that secondary wind and inert gas installation 4 can adopt various parameters to be fit to.Secondary wind and inert gas installation 4 comprise secondary wind conveying equipment and inert gas conveying equipment, are respectively applied for feeding secondary wind and inert gas.Wherein, the secondary wind energy provides coal grain completing combustion required air, can also add strong disturbance, makes material even, improves the burnout rate of coal; Inert gas then can be regulated stove internal combustion flue-gas temperature, strengthen the gas stream in the stove stirring, thereby makes coal abundant in the stove internal combustion.
Preferably, the secondary wind that secondary wind and inert gas installation 4 are supplied with feeds in the stove from the diverse location of flue gas stove, for example dividing from high, medium and low three positions of burner hearth feeds in the burner hearth respectively, to guarantee that fuel burns at the stove internal classification, improve coal grain burn-out degree, simultaneously, make the flue-gas temperature in the stove more even.
For guaranteeing the flue-gas temperature in emulsion zone, secondary wind and inert gas installation 4 also comprise the inert gas conveying equipment, for example by an inert gas booster fan, a certain amount of inert gas are sent into emulsion zone, absorb the heat that coal combustion sends.For making each section of burner hearth flue-gas temperature in allowed band, divide three layers of low temperature inertia circulating flue gas of sending here from another booster fan that sprays into that quantity do not wait from stove front-back wall differing heights.
In the present embodiment, by utilizing secondary wind and inert gas installation 4 inert gas with lower temperature (for example about 110 ℃), be that inertia circulating air (for example dried tail gas) is sent into burner hearth 1 from the differing heights layering, thereby the ignition temperature of burner hearth 1 can be controlled at uniform temperature, for example between 800 ℃-950 ℃.The inert gas of low temperature both can have been regulated stove internal combustion flue-gas temperature, prevented coking in the stove, strengthened gas stream in the stove simultaneously and stirred, and overheavy firing makes coal abundant in the stove internal combustion.For further guaranteeing not overtemperature, the noncoking of fuel combustion of emulsion zone, utilize booster fan with the air compartment of one road inert gas, with the combustion share of control fuel from a bypass feeding air-distribution device 2.
Preferably, the present invention is provided with cyclone separator 5 in the outlet of burner hearth 1, and the outlet of burner hearth 1 is connected with the inlet of cyclone separator 5, and in the bottom of cyclone separator 5 feeding back device 6 is set.The high-temperature flue gas with certain ash concentration that 1 outlet is carried for burner hearth separates through cyclone separator 5, and a large amount of coal ash in the flue gas can be separated, in feeding back device is sent stove back to, circulating combustion is kept normal circulating ratio in the stove, has improved the efficiency of combustion of stove.And isolated purification flue gas is sent into the drying system use by back-end ductwork 7 grades.The operation principle of described cyclone separator 5 is: contain dust gas and import from inlet between the shell and blast pipe of cyclone separator 5, form the outer eddy flow of rotation.The dust that is suspended in outer eddy flow is shifted to wall under action of centrifugal force, and discharges with the circulate solid outlet of cyclone separator 5 of outward turning, and isolated purification flue gas is discharged from the gas vent of cyclone separator 5, and exports from system by back-end ductwork 7.
Preferably, the burner hearth of flue gas stove of the present invention and back-end ductwork adopt backplate heavy boiler setting structure.And can on backplate, arrange heat-resisting pin with predetermined density, and lay insulation, thermal insulation and the high-strength fireproof high-abrasive material of different-thickness, form the backplate heavy boiler setting.Like this, both considered self expanding of furnace wall, can guarantee again furnace wall not the crack, do not come off, the furnace wall sealing property is better.
Because the present invention is improved to bubbling bed pattern flue gas stove in the flue gas stove of recirculating fluidized bed pattern, reduce the fluidisation area, improved fluidizing velocity, avoided local coking to cause " dead bed ", guaranteed material evenly burning in stove, made furnace capacity from bringing up to more than the 40MW below the 20MW.
Fig. 3-5 shows air-distribution device, secondary wind and inert gas installation, cyclone separator and the feeding back device structure of high-temperature fume furnace of circulating fluidized bed of the present invention respectively.
The present invention also provides a kind of high-temperature fume furnace of circulating fluidized bed control method, may further comprise the steps:
Start burning; After the flue gas stove starts burning, an amount of secondary air flow and inert gas air quantity are fed burner hearth; Flue-gas temperature according to each point in the stove, secondary wind and inert gas installation 4 are adjusted meticulously, so that regulate the tolerance of secondary wind and inert gas, the each point flue-gas temperature remains on 800 ℃~950 ℃ in the stove thereby make, the exit gas temperature of burner hearth 1 maintains 850 ℃ ± 50 ℃, and oxygen content of smoke gas maintains below 8%.Preferably, oxygen content of smoke gas is controlled at below 5%.
The high-temperature flue gas of furnace outlet enters cyclone separator 5 and carries out gas solid separation, and the flue gas that purified is introduced back-end ductwork 7 by the central tube of cyclone separator; The coal ash that is separated in cyclone separator through the person in charge and the feeding back device 6 of cyclone separator bottom, is partly or entirely controlledly sent back to the lower furnace portion emulsion zone and is realized circulating combustion, to reach the highest efficiency of combustion.
Although the present invention is described by above-mentioned preferred implementation, its way of realization is not limited to above-mentioned embodiment.Should be realized that under the situation that does not break away from purport of the present invention those skilled in the art can make different variations and modification to the present invention.

Claims (7)

1. a high-temperature fume furnace of circulating fluidized bed is characterized in that, comprising: burner hearth, air-distribution device, strength coal sorting feeder, secondary wind and inert gas installation, cyclone separator, feeding back device and back-end ductwork, wherein,
The coal mouth of broadcasting of the air outlet of air-distribution device and strength coal sorting feeder all is communicated with burner hearth;
Secondary wind and inert gas installation are communicated with burner hearth;
Furnace outlet is connected with the inlet of cyclone separator;
Feeding back device one end is connected with the solid outlet of cyclone separator, and the other end is communicated with burner hearth;
Back-end ductwork is connected with the gas vent of cyclone separator.
2. high-temperature fume furnace of circulating fluidized bed according to claim 1 is characterized in that, secondary wind and inert gas installation communicate with burner hearth at the differing heights of hearth wall.
3. high-temperature fume furnace of circulating fluidized bed according to claim 2 is characterized in that, also comprises the branch matching air box, and by described minute matching air box, described secondary wind and inert gas installation communicated with burner hearth at the differing heights of hearth wall.
4. high-temperature fume furnace of circulating fluidized bed according to claim 3 is characterized in that, matching air box comprised the multilayer airway that throughput is different in described minute.
5. high-temperature fume furnace of circulating fluidized bed according to claim 4 is characterized in that, air-distribution device and strength coal sorting feeder provide wind-force by same high pressure positive blower.
6. a high-temperature fume furnace of circulating fluidized bed control method is characterized in that, comprising:
A. start burning;
B. in burner hearth, feed secondary air flow and inert gas,, temperature in the stove is remained on 800 ℃-950 ℃, will export oxygen content of smoke gas and remain on below 8% by regulating described secondary wind and amount of inert gas;
C. the flue gas of furnace outlet is introduced cyclone separator and carry out gas solid separation;
D. the flue gas after separating is introduced back-end ductwork by cyclone separator, and the isolated coal ash of cyclone separator is sent burner hearth back to through feeding back device.
7. high-temperature fume furnace of circulating fluidized bed according to claim 6 is characterized in that, by described minute matching air box, described secondary wind and inert gas fed burner hearth from the differing heights of hearth wall.
CN2008102246123A 2008-10-21 2008-10-21 High-temperature fume furnace of circulating fluidized bed and control method thereof Active CN101725965B (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103727530A (en) * 2013-12-13 2014-04-16 神华集团有限责任公司 System and method for monitoring oxygen at furnace exit of circulating fluidized bed boiler
CN104350330A (en) * 2012-06-18 2015-02-11 美得华水务株式会社 Circulating-type multi-layer furnace
CN104482544A (en) * 2014-12-12 2015-04-01 华西能源工业股份有限公司 CFB (circulating fluid bed) refuse incineration boiler air distribution system
CN105716091A (en) * 2016-02-17 2016-06-29 无锡国联环保科技股份有限公司 Flue gas recirculation sludge spouted fluidized bed incineration system and method
CN105889908A (en) * 2016-06-06 2016-08-24 湖北金炉节能股份有限公司 Oxygen control fluidized combustion furnace
CN106196031A (en) * 2016-08-31 2016-12-07 自贡华西能源工业有限公司 A kind of flue gas generation equipment of CFB
CN106196032A (en) * 2016-08-31 2016-12-07 自贡华西能源工业有限公司 A kind of blowing system for CFB flue gas generation equipment
CN106369597A (en) * 2016-08-31 2017-02-01 自贡华西能源工业有限公司 Control method for CFB flue gas generating equipment
CN106369598A (en) * 2016-08-31 2017-02-01 自贡华西能源工业有限公司 Monitoring system of CFB smoke generation equipment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1082164A (en) * 1993-06-30 1994-02-16 清华大学 Burner for heating powdered coal on fluidized bed by precombustion
CN2192806Y (en) * 1994-04-20 1995-03-22 开封锅炉厂 Outer circulation fluidzing bed boiler
CN2283188Y (en) * 1996-09-24 1998-06-03 中国科学院工程热物理研究所 Refuse incinerator with circulating fluidized bed
CN2428695Y (en) * 2000-05-25 2001-05-02 中国科学院工程热物理研究所 Circulation fluidizing-bed garbage incineration furnace with novel external heat-exchanger
CN100590356C (en) * 2006-08-09 2010-02-17 朴显泽 Fluid bed boiler for combusting biomass

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104350330A (en) * 2012-06-18 2015-02-11 美得华水务株式会社 Circulating-type multi-layer furnace
CN104350330B (en) * 2012-06-18 2016-09-07 美得华水务株式会社 Circular form multilayer combustion stove
CN103727530A (en) * 2013-12-13 2014-04-16 神华集团有限责任公司 System and method for monitoring oxygen at furnace exit of circulating fluidized bed boiler
CN104482544A (en) * 2014-12-12 2015-04-01 华西能源工业股份有限公司 CFB (circulating fluid bed) refuse incineration boiler air distribution system
CN105716091A (en) * 2016-02-17 2016-06-29 无锡国联环保科技股份有限公司 Flue gas recirculation sludge spouted fluidized bed incineration system and method
CN105889908A (en) * 2016-06-06 2016-08-24 湖北金炉节能股份有限公司 Oxygen control fluidized combustion furnace
CN106196031A (en) * 2016-08-31 2016-12-07 自贡华西能源工业有限公司 A kind of flue gas generation equipment of CFB
CN106196032A (en) * 2016-08-31 2016-12-07 自贡华西能源工业有限公司 A kind of blowing system for CFB flue gas generation equipment
CN106369597A (en) * 2016-08-31 2017-02-01 自贡华西能源工业有限公司 Control method for CFB flue gas generating equipment
CN106369598A (en) * 2016-08-31 2017-02-01 自贡华西能源工业有限公司 Monitoring system of CFB smoke generation equipment

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