CN202813358U - Semi-tower-type intermediate-temperature separation biomass circulating fluidized bed boiler - Google Patents
Semi-tower-type intermediate-temperature separation biomass circulating fluidized bed boiler Download PDFInfo
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- CN202813358U CN202813358U CN 201220359438 CN201220359438U CN202813358U CN 202813358 U CN202813358 U CN 202813358U CN 201220359438 CN201220359438 CN 201220359438 CN 201220359438 U CN201220359438 U CN 201220359438U CN 202813358 U CN202813358 U CN 202813358U
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Abstract
The utility model relates to a semi-tower-type intermediate-temperature separation biomass circulating fluidized bed boiler which comprises a front vertical shaft, an intermediate gas-solid separation and circulated material return unit and a rear smoke channel, wherein the front vertical shaft comprises a hearth, a convection vertical shaft and a smoke reversal chamber; the intermediate gas-solid separation and circulated material return unit comprises a gas-solid separation device, a return riser and a return device; a superheater, an economizer and an air pre-heater are arranged in the rear smoke channel along the smoke flowing direction, two or three secondary air layers are arranged on the lower part of the hearth along the height direction, a convection heating surface is arranged in the convection vertical shaft at the upper part of the hearth; and the hearth, the convection vertical shaft, the smoke reversal chamber, the gas-solid separation device, the return riser and the return device form a main circulation loop. The semi-tower-type intermediate-temperature separation biomass circulating fluidized bed boiler has the advantages of wide fuel adaptability, high combusting efficiency, little heating surface abrasion and corrosion, and has the capability of effectively avoiding slag bonding, slag adhering, dust deposition, ash blockage, bed material agglomeration and return device blockage as the temperature of smoke in an inlet of the gas-solid separation device is 400 DEG C-750 DEG C.
Description
Technical field
The utility model relates to CFBB, particularly a kind of half tower middle temperature separating biomass CFBB.
Background technology
Biomass energy is the energy that utilizes natural plant, ight soil and town and country debirs to be transformed, being solar energy is stored in form of energy in the living beings with the chemical energy form, having and renewable, lowly pollute, distribute wide and the characteristics such as total amount is large, is a kind of regenerative resource of high-quality.Living beings especially agriculture and forestry organic waste material act as a fuel when using, and have variety diversity, complexity, and the characteristics such as the combustible basis volatile content is high, sulfur content is low, dust burdening is few, bulk density is little, alkali metal content is high, ash fusion point is low.Circulating fluidized-bed boiler Combustion technology has good fuel tolerance, therefore, has obtained in recent years fast development in the generating power with biomass combustion field.
Application number is that 200610088935.5 patent of invention " a kind of biomass circulating fluidized bed combustion method and biomass recirculating fluidized bed boiler " discloses and arranges screen formula radiation heating-surface in a kind of burner hearth, mix simultaneously and burn the coal that is no more than gross energy 20%, and in combustion process, add biomass recirculating fluidized bed boiler and the combustion method thereof of inert bed material; The patent No. is that 200720309013.2 utility model patent " biomass recirculating fluidized bed boiler " discloses a kind of biomass recirculating fluidized bed boiler that adopts high temperature centering type cyclone separator; The patent No. is that 200820108769.5 utility model patent " circulating fluid bed boiler of stalk " discloses the biomass recirculating fluidized bed boiler that water-cooled evaporation screen is set in a kind of burner hearth and adopts high temperature cyclone separator; The patent No. be 200820192995.6 utility model patent " biological substance for combustion multi-channel circulating fluidized bed boiler " and application number be 201110229421.8 patent of invention " a kind of fin panel casing four flue biomass circulating fluidized bed boilers " disclosed be that a kind of high temperature cyclone separator, back-end ductwork of adopting is the biomass recirculating fluidized bed boiler of multichannel and four flue structures; Application number be 201010295030.1 patent of invention " low-ratio biomass circulating fluidized bed boiler and combustion method thereof " disclosed be that warm horizontal vaporphase cooling separator, emulsion zone arrange that pipe laying heating surface, burner hearth are provided with furnace arch, furnace nose, the upper furnace setting curtain wall vertical with horizontal plane and low-ratio biomass circulating fluidized bed boiler and the combustion method thereof of convection heating surface in a kind of the employing.
For the separating at high temperature CFBB, because the alkali metal content of biomass fuel is high, ash fusion point is low, and the various piece of main circulation loop all is among the higher temperature environment, thereby make the fuel ash in the loop be melting or partially molten state, cause easily the burner hearth emulsion zone, air-distribution device, separator and feeding back device slagging scorification, caking and exhaust gases passes or recycle stock passage stop up and cause the phenomenon of blowing out, high temperature shields on formula or the convection heating surface after also often causing slag or sintered deposit to be bonded in the interior curtain wall of burner hearth and separator, dross and serious fouling phenomenon occur, affect high efficiency boiler, safely operation.
The compositions such as the chlorine that contains in the biomass fuel composition, sulphur and alkali metal will generate hydrogen sulfide H in combustion process
2S, hydrogen chloride HCl, chlorine Cl
2With alkali metal chlorides such as sodium chloride nacl, potassium chloride (KCl)s, and potassium-three ferric sulfate K
3Fe (SO
4)
3And sodium-three ferric sulfate Na
3Fe (SO
4)
3, the security of boiler heating surface formed threaten the mordant compound of metal implement in basic sulfatase complex compound etc.
Enriched in silica SiO in the bed material
2The time, silica SiO
2Can with sodium carbonate Na
2CO
3Or potash K
2CO
3Deng reacting, form the low-temperature eutectic mixture, will cause the bed material and the problem of bonding occur, and then affect the fluidization quality of bed material, will cause bed large tracts of land caking, slagging scorification when serious, cause the stoppage in transit of boiler.
Although the combustible basis volatile contents such as some biomass fuels such as husk are very high, the fuel fire temperature is low, very easily catch fire,, when ignition temperature was higher than 900 ℃, fuel ash formed carbon-silicon complex easily, hindered the carrying out of burning, and fuel is difficult to after-flame.
For addressing the above problem, stove internal combustion temperature and the gas residence time of biomass recirculating fluidized bed boiler need to be controlled within the suitable scope, and reduce fuel is at the peak temperature of stove internal combustion, reasonable temperature is interval relatively uniformly to make whole burner hearth maintain one, so neither affect the abundant burning of fuel, can also reduce the gas phase alkali metal that enters flue gas and the amount of chlorine element, and then the corrosion that can effectively alleviate heating surface, avoid the appearance of the phenomenons such as ash erosion, dross, dust stratification, stifled ash, bed material caking.Therefore design that a kind of fuel tolerance is wide, efficiency of combustion is high, heating surface wear is little with corrosion, and can effectively avoid the phenomenons such as ash erosion, dross, dust stratification, stifled ash, bed material caking, feeding back device obstruction partly tower middle temperature separating biomass CFBB is very necessary.
Summary of the invention
The purpose of this utility model provides that a kind of fuel tolerance is wide, efficiency of combustion is high, heating surface wear and corrosion are little, and can effectively avoid the partly tower middle temperature separating biomass CFBB of the phenomenons such as ash erosion, dross, dust stratification, stifled ash, bed material caking, feeding back device obstruction.
For achieving the above object, the utility model adopts following technical scheme: half tower middle temperature separating biomass CFBB, formed by anterior vertical shaft, middle gas solid separation and recycle stock loopback cell and back-end ductwork, it is characterized in that described anterior vertical shaft comprises that burner hearth, upper furnace are to flow through shaft and gas reversal chamber, burner hearth bottom is air-distribution device, the air-distribution device below is an air compartment, lower furnace portion is along being furnished with the layer 2-3 Secondary Air on the short transverse, burner hearth bottom also is provided with scum pipe, and upper furnace is to being furnished with convection heating surface in the flow through shaft; Gas solid separation and recycle stock loopback cell arrange gas-solid separating device, feed back standpipe and feeding back device from top to bottom in the middle of described; Be furnished with superheater, economizer and air preheater in the described back-end ductwork; Burner hearth, upper furnace consist of the main circulation loop of biomass fuel circulating combustion and solid combustion product and bed material cycling and reutilization to flow through shaft, gas reversal chamber, gas-solid separating device, feed back standpipe and feeding back device; The gas-solid separating device entrance links to each other with the gas reversal chamber outlet, and the feeding back device outlet is connected to lower furnace portion, and gas-solid separating device is connected by the separator outlet flue with back-end ductwork.
Further, in such scheme, described upper furnace is to also being furnished with evaporating heating surface in the flow through shaft.
Further, in such scheme, described convection heating surface is the combination of superheater or economizer or superheater and economizer, and described convection heating surface adopts working medium to flow to the counter-flow arrangement opposite with flue gas flow direction or working medium flows to the following current layout identical with flue gas flow direction.
Further, in such scheme, described convection heating surface or evaporating heating surface are tube bank or tube panel structure, and the angle of described tube bank or tube panel and horizontal plane is 0 °-35 °.
Further, in such scheme, described convection heating surface or evaporating heating surface by hanging supporting device hang upper furnace to flow through shaft in.
Further, in such scheme, the column pipe of described hanging supporting device for adopting water or steam to cool off, or adopt the bracing or strutting arrangement that is formed by member or Component composition.
Further, in such scheme, described anterior vertical shaft is coated by fin panel casing and forms, and described Secondary Air be arranged in parallel or is crisscross arranged along short transverse.
Further, in such scheme, described superheater, economizer and air preheater are disposed in order or arranged crosswise successively along flue gas flow direction.
Further, in such scheme, described back-end ductwork is single or multiple exhaust gases passes, and described back-end ductwork is constituted by membrane wall or light-duty backplate furnace wall or membrane wall and light-duty backplate furnace wall, also is furnished with evaporating heating surface in the described back-end ductwork.
The utility model is controlled between 400-750 ℃ the flue-gas temperature of the gas reversal chamber outlet of anterior vertical shaft top, gas-solid separating device entrance by being arranged in upper furnace to the heat exchange of the evaporating heating surface in the flow through shaft and convection heating surface.The utility model is in below the biomass fuel ash fusion point temperature usually because gas-solid separating device import cigarette temperature is lower, can effectively avoid gas-solid separating device, feed back standpipe and feeding back device generation slagging scorification, caking and clogging; Because it is lower that recycle stock returns the temperature of lower furnace portion emulsion zone, can effectively bed temperature be controlled at below 850 ℃, and need not pipe laying be set at the burner hearth emulsion zone, both avoid the excessively low problem of bed temperature under boiler at low load or the fuel change operating mode, effectively prevented again ash erosion and bed material caking; Because the recycle stock temperature is not high, need not take special cooling processing structure to separator, feed back standpipe, feeding back device, thereby significantly reduce the cost of boiler; Because upper furnace is arranged among the boiler main closed circuit to the evaporating heating surface in the flow through shaft and convection heating surface, during boiler operatiopn, a large amount of recycle stocks wash away it, has automatic cleaning action, dust stratification and the stifled ash of stove internal heating surface can be effectively prevented, dust stratification and the stifled ash of back-end ductwork convection heating surface can be effectively administered in addition; Because it is lower to enter the flue-gas temperature of back-end ductwork, flying dust caking property significantly reduces, and in the situation of reasonable disposition soot blower, can effectively administer dust stratification and the stifled ash of back-end ductwork convection heating surface; Because upper furnace is to being furnished with evaporating heating surface and convection heating surface in the flow through shaft, therefore there is a thermograde at the anterior vertical shaft of boiler in flue gas along short transverse, the velocity gradient that correspondingly has a flue gas, can make the imperfect combustion biomass fuel of a part before entering gas-solid separating device, form sticking wall flow with the part recycle stock, fall into burner hearth from the top of the anterior vertical shaft of boiler, strengthened the interior internal circulating load of boiler, fuel increased in the time of staying of high-temperature region, and impel the ignition temperature level of burner hearth integral body to be tending towards evenly, thereby can improve largely efficiency of combustion; Reduce owing to enter the flue-gas temperature of gas-solid separating device, the viscosity of flue gas also decreases, and gas solid separation efficient then significantly improves, and is conducive to capture the more tiny uncombusted fuel particle of granularity, and boiler efficiency can be further enhanced; Owing to have a large amount of high hotbed material and circulating ash in the burner hearth, very large thermal inertia is arranged, the ratio row that the new biomass fuel amount that drops into accounts for total material amount are very little, thereby boiler is to the strong adaptability of fuel; Temperature evenly and be in rational temperature range in the stove, the amount that has reduced the generation of molten slag and entered gas phase alkali metal and the chlorine element of flue gas, and the flue-gas temperature that enters the high temperature convection heating surface is relatively low, and be arranged in upper furnace to the high-temperature surface in the flow through shaft, at recycle stock under the deashing effect, can prevent the deposition of flying dust, reduced in the flying dust corrosive substance for the erosion of tube wall metal, add the following current layout and adopt suitable anticorrosion tubing, the high temperature corrosion that can alleviate heating surface; Gas solid separation in the main circulation loop and recycle stock loopback cell are in the relatively low zone of cigarette temperature, the abrasionproof performance of abrasionproof refractory material can better be brought into play in the stove, the reasonably employing of the abrasionproof measures such as flue gas flow rate and abrasion-proof cover plate can solve the heating surface wear problem effectively simultaneously.In addition, in the anterior vertical shaft of boiler superheater is set, also helps boiler and under low load condition, guarantee qualified superheated steam parameter.
The utility model fuel tolerance is wide, efficiency of combustion is high, heating surface wear and corrosion are little, and can effectively avoid the phenomenons such as ash erosion, dross, dust stratification, stifled ash, bed material caking, feeding back device obstruction.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the utility model;
Fig. 2 is the structural representation of another embodiment of the utility model figure.
Among the figure: the anterior vertical shaft of 1-, the 1.1-burner hearth, the 1.2-upper furnace is to flow through shaft, the 1.21-convection heating surface, 1.22-evaporating heating surface, 1.23-hanging supporting device, 1.3-gas reversal chamber, 1.4-air-distribution device, 1.5-an air compartment, 1.6-Secondary Air, 1.7-scum pipe; Gas solid separation and recycle stock loopback cell in the middle of the 2-, 2.1-gas-solid separating device, 2.2-feed back standpipe, 2.3-feeding back device, 2.4-separator outlet flue; The 3-back-end ductwork, 3.1-superheater, 3.2-economizer, 3.3-air preheater, 3.4-evaporating heating surface.
The specific embodiment
Below in conjunction with drawings and Examples the utility model is further described, but this embodiment should not be construed as restriction of the present utility model.
Embodiment 1:
Biomass fuel enters burner hearth 1.1 by front feeding device, wind by an air compartment 1.5 of furnace bottom through air-distribution device 1.4 as primary combustion with wind and stove in the fluidizing agent of material send into burner hearth 1.1, Secondary Air 1.6 divides 3 layers in lower furnace portion along short transverse, each layer all adopts and is arranged in parallel, to guarantee to offer the enough combustion airs of fuel.
Biomass fuel catches fire at the emulsion zone of lower furnace portion, burning and discharge most heat under anaerobic condition, the fugitive constituent that does not burn and carbon particle enter the burner hearth dilute-phase zone through the burner hearth transition region, and further burning generates high-temperature flue gas, the SO in the flue gas in the oxidisability zone that Secondary Air forms
2With the reactions such as alkali metal oxide in the recycle stock, can remove a part of SO
2Owing to adopt the air stage feeding mode, simultaneously by rational stove internal combustion operating mode tissue and ignition temperature control, can also reduce in a large number NO
XGeneration.
Flue gas carries a large amount of recycle stocks and upwards washes away successively and be arranged in upper furnace to the evaporating heating surface 1.22 in the flow through shaft 1.2 and convection heating surface 1.21, gas reversal chamber 1.3 through roof of the furnace arrives gas-solid separating device 2.1 entrances again, and this moment, the cigarette temperature had been cooled to below 750 ℃.Evaporating heating surface 1.22 and convection heating surface 1.21 by column pipe 1.23 hang upper furnace to flow through shaft 1.2 in.
Flue gas after being cooled enters gas-solid separating device 2.1 and carries out " gas-solid " separation, and the flue gas that carries a small amount of flying dust enters back-end ductwork 3 by central cylinder of separator through separator outlet flue 2.4.Back-end ductwork 3 is divided into two exhaust gases passes.Flue gas flow through successively superheater 3.1, economizer 3.2 and air preheater 3.3 in the back-end ductwork 3.
The recycle stock, unburnt carbon particle and the fuel ash that are caught by gas-solid separating device 2.1, feed back standpipe 2.2 through gas-solid separating device 2.1 belows is partly or entirely controlledly sent back to burner hearth as required by feeding back device 2.3, realizes the circulating combustion of biomass fuel and the cycling and reutilization of solid combustion product and bed material.Under different loads, by regulating the size of air distribution ratio and time ash amount, effectively control bed temperature to maintain below 850 ℃, guarantee catching fire and steady combustion of biomass fuel, and prevent ash erosion and a material caking.
Burner hearth bottom also is provided with scum pipe 1.7, is used for end slag is discharged boiler, keeping rational bed pressure drop, and forms the in-furnace dust CONCENTRATION DISTRIBUTION field of efficient heat transfer.
Embodiment 2:
The total arrangement of present embodiment and embodiment 1 is basic identical, and both difference is: the upper furnace of present embodiment is to only being furnished with convection heating surface 1.21 in the flow through shaft 1.2, convection heating surface 1.21 is suspended on the water-cooling wall by bracing or strutting arrangement 1.23.Respectively establish 2 layers of Secondary Air 1.6 on the burner hearth 1.1 bottom front-back wall water-cooling walls, employing is crisscross arranged, so that the less biomass fuel of density is under the disturbance of staggered Secondary Air 1.6, the flow process in stove forms the movement locus of similar serpentine, prolongs it in the time of staying of burner hearth high-temperature region.Back-end ductwork 3 is set to single exhaust gases passes, is provided with superheater 3.1, economizer 3.2 and the air preheater 3.3 of evaporating heating surface 3.4, arranged crosswise from top to bottom.
In the previous embodiment, upper furnace can be superheater to the convection heating surface 1.21 in the flow through shaft 1.2, also can be economizer, or both combinations.The arrangement form of convection heating surface 1.21 can adopt the working medium flow direction counter-flow arrangement opposite with flue gas flow direction in it, also can adopt the following current identical with flue gas flow direction to arrange.The structure of gas-solid separating device 2.1 can adopt adiabatic form, also can adopt water, steam or air methods for cooling; Can adopt cyclone separator, separator or other any type of gas-solid separating device in the time of also can adopting centering type cyclone separator, square separator, scroll casing type separator, horizontal separator, bump.Back-end ductwork 3 employing membrane walls or light-duty backplate furnace wall or the mode that both combine, superheater 3.1 and economizer 3.2 can adopt arranged crosswise in it, and economizer 3.2 and air preheater 3.3 also can adopt arranged crosswise.
The content that is not described in detail in this specification belongs to the known prior art of those skilled in the art.
Claims (9)
1. half tower middle temperature separating biomass CFBB, by anterior vertical shaft (1), middle gas solid separation and recycle stock loopback cell (2) and back-end ductwork (3) form, it is characterized in that: described anterior vertical shaft (1) comprises burner hearth (1.1), upper furnace is to flow through shaft (1.2) and gas reversal chamber (1.3), burner hearth (1.1) bottom is air-distribution device (1.4), air-distribution device (1.4) below is an air compartment (1.5), burner hearth (1.1) bottom is along being furnished with layer 2-3 Secondary Air (1.6) on the short transverse, burner hearth (1.1) bottom also is provided with scum pipe (1.7), and upper furnace is to being furnished with convection heating surface (1.21) in the flow through shaft (1.2); Gas solid separation and recycle stock loopback cell (2) arrange gas-solid separating device (2.1), feed back standpipe (2.2) and feeding back device (2.3) from top to bottom in the middle of described; Be furnished with superheater (3.1), economizer (3.2) and air preheater (3.3) in the described back-end ductwork (3); Burner hearth (1.1), upper furnace consist of the main circulation loop of biomass fuel circulating combustion and solid combustion product and bed material cycling and reutilization to flow through shaft (1.2), gas reversal chamber (1.3), gas-solid separating device (2.1), feed back standpipe (2.2) and feeding back device (2.3); Gas-solid separating device (2.1) entrance links to each other with gas reversal chamber (1.3) outlet, feeding back device (2.3) outlet is connected to burner hearth (1.1) bottom, and gas-solid separating device (2.1) is connected by separator outlet flue (2.4) with back-end ductwork (3).
2. half tower middle temperature separating biomass CFBB according to claim 1, it is characterized in that: described upper furnace is to also being furnished with evaporating heating surface (1.22) in the flow through shaft (1.2).
3. half tower middle temperature separating biomass CFBB according to claim 1 and 2, it is characterized in that: described convection heating surface (1.21) is the combination of superheater or economizer or superheater and economizer, and described convection heating surface (1.21) adopts working medium to flow to the counter-flow arrangement opposite with flue gas flow direction or working medium flows to the following current layout identical with flue gas flow direction.
4. half tower middle temperature separating biomass CFBB according to claim 2, it is characterized in that: described convection heating surface (1.21) or evaporating heating surface (1.22) are tube bank or tube panel structure, and the angle of described tube bank or tube panel and horizontal plane is 0 °-35 °.
5. half tower middle temperature separating biomass CFBB according to claim 4 is characterized in that: described convection heating surface (1.21) or evaporating heating surface (1.22) by hanging supporting device (1.23) hang upper furnace to flow through shaft (1.2) in.
6. half tower middle temperature separating biomass CFBB according to claim 5, it is characterized in that: the column pipe of described hanging supporting device (1.23) for adopting water or steam to cool off, or adopt the bracing or strutting arrangement that is formed by member or Component composition.
7. half tower middle temperature separating biomass CFBB according to claim 1 and 2, it is characterized in that: described anterior vertical shaft (1) is coated by fin panel casing and forms, and described Secondary Air (1.6) be arranged in parallel or is crisscross arranged along short transverse.
8. half tower middle temperature separating biomass CFBB according to claim 1 and 2, it is characterized in that: described superheater (3.1), economizer (3.2) and air preheater (3.3) are disposed in order or arranged crosswise successively along flue gas flow direction.
9. half tower middle temperature separating biomass CFBB according to claim 1, it is characterized in that: described back-end ductwork (3) is single or multiple exhaust gases passes, described back-end ductwork (3) is constituted by membrane wall or light-duty backplate furnace wall or membrane wall and light-duty backplate furnace wall, also is furnished with evaporating heating surface (3.4) in the described back-end ductwork (3).
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|---|---|---|---|
| CN 201220359438 CN202813358U (en) | 2012-07-24 | 2012-07-24 | Semi-tower-type intermediate-temperature separation biomass circulating fluidized bed boiler |
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|---|---|---|---|
| CN 201220359438 CN202813358U (en) | 2012-07-24 | 2012-07-24 | Semi-tower-type intermediate-temperature separation biomass circulating fluidized bed boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777895A (en) * | 2012-07-24 | 2012-11-14 | 武汉和信益科技有限公司 | Semi-tower type medium-temperature separation biomass circulating fluidized bed boiler |
| CN105805736A (en) * | 2014-12-31 | 2016-07-27 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler and method for preventing heated surface from being stained by alkali metal compounds |
| CN107606609A (en) * | 2017-10-31 | 2018-01-19 | 清华大学 | A kind of CFBB of lower heat of combustion high-ash fuel |
-
2012
- 2012-07-24 CN CN 201220359438 patent/CN202813358U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777895A (en) * | 2012-07-24 | 2012-11-14 | 武汉和信益科技有限公司 | Semi-tower type medium-temperature separation biomass circulating fluidized bed boiler |
| CN102777895B (en) * | 2012-07-24 | 2015-03-04 | 武汉和信益科技有限公司 | Semi-tower type medium-temperature separation biomass circulating fluidized bed boiler |
| CN105805736A (en) * | 2014-12-31 | 2016-07-27 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler and method for preventing heated surface from being stained by alkali metal compounds |
| CN105805736B (en) * | 2014-12-31 | 2018-09-11 | 中国科学院工程热物理研究所 | Circulating fluidized bed boiler and the method for preventing its heating surface alkali metal compound from staiing |
| CN107606609A (en) * | 2017-10-31 | 2018-01-19 | 清华大学 | A kind of CFBB of lower heat of combustion high-ash fuel |
| CN107606609B (en) * | 2017-10-31 | 2024-03-19 | 清华大学 | Circulating fluidized bed boiler for burning low-calorific-value high-ash-content fuel |
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