CN1877195B - Circulating fluidized bed type high temperature hot blast stove system - Google Patents
Circulating fluidized bed type high temperature hot blast stove system Download PDFInfo
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- CN1877195B CN1877195B CN200610043047A CN200610043047A CN1877195B CN 1877195 B CN1877195 B CN 1877195B CN 200610043047 A CN200610043047 A CN 200610043047A CN 200610043047 A CN200610043047 A CN 200610043047A CN 1877195 B CN1877195 B CN 1877195B
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Abstract
The invention relates to a cycle fluid bed high-temperature hot wind furnace, which comprises a hearth, a separator, a wind distributor, a material feeder, a high-low temperature exchanger and an air preheat device. The invention is characterized in that: the hearth uses direct-current boiler type; the ascending tube uses three parallel tubes, to increase the heated area, avoid high-temperature smoke brushing the wall, and prolong the service life of wall; and guiding tail smoke into the secondary wind, to circulate the smoke and adjust the smoke temperature, strengthen the heat transmission and realize quick load adjustment; the air preheat device has a torsion plate as the turbolator to strengthen the heat transmission; and uses interlayer heater to confirm the clearness of hot wind; and calculating each part, to select steel according to the temperature to reduce the consumption and refractory steel and reduce cost, based on confirmed strength.
Description
Technical field
The invention belongs to the industrial boiler field, be specifically related to a kind of in order to the industrial boiler system of high temperature drying hot blast to be provided.
Technical background
Hot-blast stove is widely used in the heating and dehumidification of agricultural product, food, medical medicine, industrial chemicals, weight industrial products, also can be used for the heating of various facilities and storehouse dehumidifying etc.Along with developing rapidly of industry, the demand of hot-blast stove is increasing, the requirement of environmental protection and energy saving is also improved constantly, so the energy-conserving and environment-protective hot-blast stove has huge market prospects.But present domestic hot-blast stove technology does not also form complete theoretical system, standard that Shang Weiyou is unified and corresponding techniques standard, and product form is varied, roughly is divided into following two kinds of forms on the general structure:
A kind of version is to adopt the hot-blast stove of tubular type or sheet material formula, utilizes tube wall or one deck steel plate to isolate between the burning things which may cause a fire disaster of hot blast and heating and conducts heat, and the long-term down use continuously of the very difficult solution of this form high temperature, its life-span also only is one to three year.Another kind of version adopts the heat pipe heat exchanging technology.But the wretched insufficiency part that heat pipe hot-blast stove exists is that the operating temperature of heat pipe own is in development more than 300 ℃ with to use that is that all right ripe, problems such as booster, stifled ash, dew point corrosion appear under the hot operation state easily, the danger that makes heat pipe hot-blast stove burn out under high-temperature situation increases, can't realize the effect of heat pipe heat exchanging, the application of product is restricted.
Particularly existing coal-fired hot-blast stove mostly adopts horizontal reciprocating furnace and chain furnace, exist low such as the thermal efficiency, service life short, shortcoming such as bulky: generally about 300 ℃, efficiency of combustion is less than 50% for the hot blast temperature of generation; It is single to use coal, is thermal source with the fat coal mainly, and coal adaptability is poor; Service life is short, generally less than 3 years; Safeguard and the operating cost costliness; Seriously polluted, desulfuration efficiency is low, and discharged nitrous oxides is up to 600～1000mg/Nm
3Fluctuation of service, load regulation range is little, and load can not be too low etc.These shortcomings make existing hot-blast stove can not satisfy the requirement of industrial development far away.
Summary of the invention
The present invention provides a kind of circulating fluidized bed type high temperature hot blast stove system in order to overcome above-mentioned prior art deficiency, can make hot-blast stove reach the clean high temperature of hot blast, energy-conserving and environment-protective, economic requirement reliably.
Technical scheme of the present invention is achieved in that and the present invention includes recirculating fluidized bed burner hearth, standpipe, cyclone separator, high-temperature heat-exchanging, high-temperature air preheater, low-temperature air preheater, cryogenic heat exchanger, recirculating fluidized bed burner hearth exit is provided with cyclone separator, the cyclone separator below connects standpipe, the top links to each other with horizontal flue, be furnished with high-temperature heat-exchanging in the horizontal flue, the horizontal flue end links to each other with vertical back-end ductwork, has arranged cryogenic heat exchanger, high-temperature air preheater, low-temperature air preheater in the back-end ductwork from top to bottom successively.
Adopt the direct current cooker form in the recirculating fluidized bed burner hearth, recirculating fluidized bed burner hearth inner disc adopts the form of multitube parallel around a tedge.
Turn round sheet as turbolator inner the adding at high temperature, low-temperature air preheater.
Adopted the form of direct current cooker in the burner hearth of the present invention, tedge of coiling in the burner hearth adopts three pipe parallel forms, to guarantee rational air velocity. and like this, in burner hearth, increased heating surface, can make overall structure compact more; Prevent that high-temperature flue gas from directly washing away furnace wall, reduced temperature of furnace wall, thereby can prolong the use of furnace wall life-span and minimizing high-temperature refractory steel; Introducing is carried out flue gas recirculation from the flue gas of afterbody extraction near the intake of secondary wind, realizes low-temperature burning, and reaches requirements such as adjusting furnace outlet gas temperature, the heat transfer of reinforcement fume side and realization quick load adjustment, reduces the boiler operatiopn expense; Partly adopt the way that adds turbolator (turning round sheet) at air preheater, reach the purpose of augmentation of heat transfer.
Material therefor of the present invention is common 20g carbon steel and 12 ℃ of r1MoV steel alloys, is thermal source with the coal dust, and air is a working medium, and the design hot blast temperature is up to 500 ℃.Owing to adopt the indirect tubular structure, can produce clean hot-air, also can select for use the high-quality stainless steel to satisfy the demand of high-quality hot blast.In addition, system's each several part is carried out detailed calculating, select steel, reduce the use of expensive heat resisting steel as far as possible, can on the assurance device intensity based, reduce cost to greatest extent at the difference of different device temperature.
The invention has the advantages that:
(1) separator adopts high temperature cyclone separator, can be from air-flow the separating high-temp solid material, and return the combustion chamber, to keep the fast fluidized condition of combustion chamber, guarantee that fuel and desulfurizing agent repeatedly circulate, burn repeatedly and react.
(2) heat exchanger comprises high-temperature heat-exchanging and cryogenic heat exchanger.Arrange high-temperature heat-exchanging in the horizontal flue behind the burner hearth, cryogenic heat exchanger is vertically arranged in the flue in the back.High-temperature heat-exchanging adopts three pipeloop formulas series connection mixed flow form, guaranteeing rational air velocity and tube wall wall temperature, and makes full use of the heat of high-temperature flue gas.Cryogenic heat exchanger adopts two-tube cast formula, counter-flow arrangement, with the caloric receptivity of minimizing working medium in high temperature section, thereby saves expensive alloy steel products, guarantees air velocity.
(3) air preheater adopts the way that adds turbolator (turning round sheet), thereby increased the turbulent extent of tube fluid and destroyed temperature boundary layer and reached enhanced heat exchange, thereby reduced heating surface and reduced cost, can improve simultaneously the wall temperature of air preheater afterbody, reduce the danger of cold end corrosion.
Owing to adopt the dividing wall type heater, the hot blast cleaning that circulating fluid bed hot-air furnace of the present invention produces, hot blast temperature can be brought up to present 550 ℃ from about 300 ℃ of general hot-blast stove.Fuel tolerance of the present invention is wide, can use various coal dusts inferior, thereby can alleviate the situation of the present energy supply anxiety of China; Efficiency of combustion reaches more than 95%, and the thermal efficiency can reach more than 85%, is higher than tens percentage points in general hot-blast stove; The plurality of advantages that possesses circulating fluidized bed system: do not need to assemble desulfurizer, reduced equipment investment, nitrogen oxide and other pollutant emissions simultaneously are low, compliance with environmental protection requirements; Ignition condition is superior, load regulation range is big, Load Regulation speed is fast, can be lower than operation steady in a long-term under 50% the load; Not fragile, safeguard that simply maintenance cost is low; The combustion intensity height because air preheater adopts the way that adds turbolator (turning round sheet), has strengthened heat transfer in addition, has adopted flue gas recirculating technique simultaneously, makes metal consumption reduce greatly, and operating cost is moderate.
Description of drawings
Accompanying drawing is a system diagram of the present invention;
Below in conjunction with accompanying drawing content of the present invention is described in further detail.
The specific embodiment
Shown in accompanying drawing, recirculating fluidized bed burner hearth of the present invention 1 exit is provided with cyclone separator 3, cyclone separator 3 belows connect standpipe 2, the top links to each other with horizontal flue 9, be furnished with high-temperature heat-exchanging 4 in the horizontal flue 9, horizontal flue 9 ends link to each other with vertical back-end ductwork 8, have arranged cryogenic heat exchanger 7, high-temperature air preheater 5, low-temperature air preheater 6 in the back-end ductwork 8 from top to bottom successively.Air-distribution device adopts blast cap formula air distribution plate, in order to the supported in rest fuel bed, keep fluidized-bed layer stable, increase gas-flow resistance.Material returning device adopts that loop seal, this material returning device can guarantee that Flow of Goods and Materials is stable, no gas anti-channeling and mass flow are controlled, can adapt to the variation of boiler operatiopn operating mode.
The present invention adopts circulating fluidized bed technique that hot-blast stove is designed, and in conjunction with the low factor of working medium (air) heat transfer efficiency, the heating surface layout has been carried out sufficient consideration, has adopted flue gas recirculating technique simultaneously.Design process comprises the selection of major parameter, the entire arrangement and the computational process of boiler.
The selection of major parameter: comprise the selection of exhaust gas temperature, the selection of hot air temperature, the selection of excess air coefficient, the selection of furnace outlet temperature etc.The design's exhaust gas temperature is 150 ℃, and hot air temperature is 100 ℃, and excess air coefficient is 1.2, and the furnace outlet temperature is 800 ℃, and the flue gas recirculation multiple is 0.25, and fluidizing velocity is 3m/s.
Its workflow is as follows:
The hot blast required air enters cryogenic heat exchanger 7 via the air inducing pump and tentatively heats; Enter burner hearth 1 heating surface by recirculating fluidized bed burner hearth 1 heating surface inlet header case then and continue heating; Collection case in the middle of then entering by recirculating fluidized bed burner hearth 1 heating surface outlet collection case; Finally heat and reach temperature required through high-temperature heat-exchanging 4 at last, lead to outlet collection case.
The burning required air via the air inducing pump enter low-temperature air preheater 6 successively, high-temperature air preheater 5 carries out preheating; Blast cap mouth by blast cap formula air distribution plate enters combustion furnace recirculating fluidized bed burner hearth 1 then, next with the form of flue gas flow through horizontal flue 9 and back-end ductwork 8, enters chimney at last, and row is to atmosphere.
Coal dust comes out from coal supply system, enters combustion furnace recirculating fluidized bed burner hearth 1 and the mixed burning of air by charging aperture, and the uncombusted pulverized coal particle separates through cyclone separator 3, enters back hopper, returns combustion furnace recirculating fluidized bed burner hearth 1 by standpipe, till after-flame.
Claims (1)
1. circulating fluidized bed type high temperature hot blast stove system, comprise, recirculating fluidized bed burner hearth (1), it is characterized in that, recirculating fluidized bed burner hearth (1) exit is provided with cyclone separator (3), cyclone separator (3) below connects standpipe (2), the top links to each other with horizontal flue (9), be furnished with high-temperature heat-exchanging (4) in the horizontal flue (9), the back-end ductwork (8) that horizontal flue (9) is terminal and vertical links to each other, arranged cryogenic heat exchanger (7) in the back-end ductwork (8) from top to bottom successively, high-temperature air preheater (5), low-temperature air preheater (6), tedge of coiling in the recirculating fluidized bed burner hearth (1), this tedge adopts multitube parallel, at high temperature, low-temperature air preheater (5,6) the inner sheet of turning round that has as turbolator that adds, high-temperature heat-exchanging adopt three pipeloop formulas series connection mixed flow form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610043047A CN1877195B (en) | 2006-06-28 | 2006-06-28 | Circulating fluidized bed type high temperature hot blast stove system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610043047A CN1877195B (en) | 2006-06-28 | 2006-06-28 | Circulating fluidized bed type high temperature hot blast stove system |
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| Publication Number | Publication Date |
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| CN1877195A CN1877195A (en) | 2006-12-13 |
| CN1877195B true CN1877195B (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610043047A Expired - Fee Related CN1877195B (en) | 2006-06-28 | 2006-06-28 | Circulating fluidized bed type high temperature hot blast stove system |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221263A (en) * | 2010-08-06 | 2011-10-19 | 湘潭互创洁净能源有限公司 | Assembled circulating fluidized bed heat carrier boiler |
| CN109028569B (en) * | 2018-09-09 | 2024-01-05 | 无锡博众热能环保设备有限公司 | Flue gas full-cycle hot-blast stove |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066498A (en) * | 1992-05-07 | 1992-11-25 | 东南大学 | Compound intensified heat-transfer type cast-iron air preheater |
| 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 |
-
2006
- 2006-06-28 CN CN200610043047A patent/CN1877195B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066498A (en) * | 1992-05-07 | 1992-11-25 | 东南大学 | Compound intensified heat-transfer type cast-iron air preheater |
| 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 |
Non-Patent Citations (4)
| Title |
|---|
| 张衍国，李清海，王连声，等.燃用生物质的循环流化床热风系统结构与运行.节能技术23 132.2005,23(132),291-294. |
| 张衍国,李清海,王连声,等.燃用生物质的循环流化床热风系统结构与运行.节能技术23 132.2005,23(132),291-294. * |
| 盛春红，陈听宽，朱国桢，等.超临界压力锅炉螺旋管圈水冷壁传热及壁温研究.发电设备 2.1998,(2),10-16. |
| 盛春红,陈听宽,朱国桢,等.超临界压力锅炉螺旋管圈水冷壁传热及壁温研究.发电设备 2.1998,(2),10-16. * |
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| CN1877195A (en) | 2006-12-13 |
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