CN102200276A - Furnace-boiler separation system for combusting low-calorific-value solid fuel - Google Patents
Furnace-boiler separation system for combusting low-calorific-value solid fuel Download PDFInfo
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- CN102200276A CN102200276A CN 201110106018 CN201110106018A CN102200276A CN 102200276 A CN102200276 A CN 102200276A CN 201110106018 CN201110106018 CN 201110106018 CN 201110106018 A CN201110106018 A CN 201110106018A CN 102200276 A CN102200276 A CN 102200276A
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Abstract
The invention discloses a furnace-boiler separation system for combusting a low-calorific-value solid fuel, belonging to the technical field of combustion equipment. The system comprises a circulating fluidized bed combustion chamber, a waste heat boiler, a gas recirculation loop and the like, wherein water-cooling walls are not arranged around the circulating fluidized bed combustion chamber, so that adiabatic combustion can be realized, temperature in the combustion chamber is greatly raised, and produced gas is conveyed to the waste heat boiler to produce steam; the gas recirculation loop which is connected to the circulating fluidized bed combustion chamber is arranged behind an outlet of the waste heat boiler; and the temperature of the combustion chamber can be adjusted and controlled by adjusting gas recirculation flow and air quantity. The system keeps the advantages of circulating fluidized bed combustion, also has the advantages of adiabatic combustion, convenience in control and the like, and is particularly suitable for combusting the fuel with extremely low calorific value.
Description
Technical field
The present invention relates to the solid-fuelled stove pot of a kind of lower heat of combustion piece-rate system, belong to the combustion apparatus technical field.
Background technology
Clean coal technology is one of our times various countries dominant technology of solving the environmental problem that is caused by coal, also is a key areas of international high-tech competition.Combustion technology of circulating fluidized can effectively be controlled NO
xAnd SO
2Generation and discharging, be one of reasonable clean coal combustion technology of present commercialization degree.CFBB has suitable vitality on world energy sources and electricity market.
CFBB has obtained using more widely in China.The fuel distribution of China is inhomogeneous, and a lot of regional fuel are deficient or have only the very low inferior fuel of calorific value, though the fuel tolerance of CFBB is very wide, but still can't stablize, the very low fuel of combustion heat value fully.If can the very low fuel of combustion heat value, just can make full use of the energy resources of China, solve some regional fuel supply problems.
Summary of the invention
Purpose of the present invention just is to propose the solid-fuelled stove pot of a kind of lower heat of combustion piece-rate system, with the very low fuel of calorific value that can't burn in the burning regular circulation fluidized-bed combustion boiler.
Technical scheme of the present invention is as follows:
The solid-fuelled stove pot of a kind of lower heat of combustion piece-rate system comprises circulating fluidized bed combustor, cyclone separator and back-end ductwork, it is characterized in that: the furnace wall of described circulating fluidized bed combustor adopts heavy boiler setting, does not arrange water-cooling wall all around; The gas approach of described back-end ductwork is communicated with the exhanst gas outlet at the top of cyclone separator, and the exhanst gas outlet of back-end ductwork is communicated with the smoke inlet of waste heat boiler; The exhanst gas outlet of waste heat boiler links to each other with the air compartment inlet of circulating fluidized bed combustor by the flue gas recycled loop; Described flue gas recycled loop is provided with recirculation blower.
In the solid-fuelled stove pot of this lower heat of combustion piece-rate system, described heavy boiler setting adopts mould brick to build by laying bricks or stones or the non-type refractory material divides three layers of cast to form, and is followed successively by refractory layer, heat insulation layer and heat-insulation layer from inside to outside; Refractory layer adopts fire clay refractory brick, and heat insulation layer is a diatomite brick, and heat-insulation layer is asbestos white clouds slabstones; The gross thickness of heavy boiler setting is 300mm～450mm.。
The present invention has following advantage and outstanding effect compared with prior art:
1) do not arrange water-cooling wall around the recirculating fluidized bed burner hearth, can make fuel adiabatic combustion in the combustion chamber, the very low fuel of calorific value that can't burn in the ordinary cycle fluidized-bed combustion boiler that therefore can burn, the fuel tolerance of system is wider.
When 2) using different fuel,, can regulate chamber temperature easily, guarantee fuel smooth combustion, completing combustion by regulating the ratio of wind and flue gas recycled.
The mode that material can take material not circulate when 3) moving can start separator like this, has reduced operating cost.
In sum, the present invention is a kind of burning process of low-calorific-value solid fuel preferably, has continued the recirculating fluidized bed plurality of advantages, goes back the low-down fuel of calorific value that can't burn in the incendivity ordinary cycle fluidized-bed combustion boiler, fuel tolerance is wider, has bright development prospect.
Description of drawings
Fig. 1 is the schematic diagram of the solid-fuelled stove pot of a kind of lower heat of combustion piece-rate system.
Among the figure: the 1-circulating fluidized bed combustor; The 2-furnace wall; The 3-separator; The 4-back-end ductwork; The 5-waste heat boiler; The 6-drum; The 7-lower collecting box; The 8-water-cooling wall; The 9-heat boiler outlet; The 10-recirculation blower; 11-flue gas recycled loop; Wind of 12-.
The specific embodiment
Further specify principle of the present invention, structure and the specific embodiment below in conjunction with accompanying drawing.
Fig. 1 is the schematic diagram of the solid-fuelled stove pot of a kind of lower heat of combustion provided by the invention piece-rate system.This system comprises circulating fluidized bed combustor 1, cyclone separator 3 and back-end ductwork 4; The furnace wall 2 of circulating fluidized bed combustor 1 adopts heavy boiler setting, does not arrange water-cooling wall all around; The gas approach of described back-end ductwork 4 is communicated with the exhanst gas outlet at the top of cyclone separator, and the exhanst gas outlet of back-end ductwork 4 is communicated with the smoke inlet of waste heat boiler 5; The exhanst gas outlet 9 of waste heat boiler links to each other with the air compartment of circulating fluidized bed combustor 1 by flue gas recycled loop 11; Described flue gas recycled loop 11 is provided with recirculation blower 10.
Heavy boiler setting adopts mould brick to build by laying bricks or stones or the non-type refractory material divides three layers of cast, is followed successively by refractory layer, heat insulation layer and heat-insulation layer from inside to outside, and refractory layer adopts fire clay refractory brick, and heat insulation layer is a diatomite brick, and heat-insulation layer is asbestos white clouds slabstones; The gross thickness of heavy boiler setting is 300mm～450mm.
The exhanst gas outlet of described back-end ductwork 4 links to each other with the gas approach of waste heat boiler 5, be provided with flue gas recycled loop 11 after the exhaust-heat boiler flue gas outlet 9, the smoke inlet in flue gas recycled loop can also be provided with recirculation blower 10 on the flue gas recycled loop before or after deduster (flue gas recycled loop inlet is positioned at before the deduster among Fig. 1).
When moving the solid-fuelled stove pot of this lower heat of combustion piece-rate system, at first add the very low fuel of calorific value, behind fuel ignition, owing to there is not water-cooling wall around the circulating fluidized bed combustor in this system, if ignore radiation loss, the caloric value of fuel just all is used to keep combustion chamber temperature, and fuel is adiabatic combustion in the combustion chamber.The flue gas that produces in the circulating fluidized bed combustor 1 enters waste heat boiler 5 behind separator 3.In waste heat boiler 5, the water in the drum 6 enters lower collecting box 7 through down-comer, enters waste heat boiler 5 water-cooling wall 8 all around then, and the water in the water-cooling wall 8 absorbs the heat from high-temperature flue gas, finally forms superheated steam and is used for industrial production or resident's heat supply.At exhanst gas outlet 9 places of waste heat boiler, recirculation blower 10 is with in the tail flue gas suction flue gas recycled loop 11, and flue gas finally returns the air compartment below the combustion chamber.So, though the calorific value of fuel itself is very low, but the condition of adiabatic combustion and high temperature have guaranteed that sufficient amount of heat is arranged in the combustion chamber under the replenishing of circulating flue gas, make the chamber temperature of this system maintain 800 ℃～900 ℃, close with the bed temperature of ordinary cycle fluidized-bed combustion boiler of the fuel of the higher calorific value of burning, so this system has kept the advantage of CFBB.Can regulate the flue gas recycled amount of returning the combustion chamber by the rotating speed of regulating recirculation blower 10, so just can regulate the temperature of combustion chamber, the calorific value of based on fuel is regulated corresponding with it flue gas recycled amount, make chamber temperature maintain 800 ℃～900 ℃, so the applicability of this system low calorie fuels that can burn is very wide.In addition, because adiabatic combustion in the stove, there is high-temperature flue gas to return burner hearth simultaneously, even material does not adopt the mode of circulation but adopts all and mend a mode of going into from the additional mouth of bed material of combustion chamber at this moment, the material of newly mend is heated to the required heat of bed temperature also can be obtained by increasing the flue gas recycled amount, chamber temperature still maintains 800 ℃～900 ℃, therefore can separator 3 out of service during system works, material adopts and not circulate, replenish from the bed material fully and mouthful mend a mode of going into, and can solve like this because of problems such as the power consumption that uses separator 3 to cause, wearing and tearing.
The low-calorific-value solid fuel burning process that uses stove pot provided by the invention to separate, can guarantee this system can burn in CFBB can't smooth combustion the very low solid fuel of calorific value, the fuel tolerance of system is wider.According to the real economy benefit, can adopt material not circulate and two kinds of methods of operation of material circulation, separator 3 is out of service under preceding a kind of method of operation, can reduce the operating cost of system.Therefore, the present invention is the low heat value combustion solid fuel combustion apparatus that a kind of good stove pot separates, and control is convenient, has bright development prospect, is particularly useful for the low-down fuel of combustion heat value.
Claims (2)
1. the solid-fuelled stove pot of lower heat of combustion piece-rate system, comprise circulating fluidized bed combustor (1), cyclone separator (3) and back-end ductwork (4), it is characterized in that: the furnace wall (2) of described circulating fluidized bed combustor (1) adopts heavy boiler setting, does not arrange water-cooling wall all around; The gas approach of described back-end ductwork (4) is communicated with the exhanst gas outlet at the top of cyclone separator, and the exhanst gas outlet of back-end ductwork (4) is communicated with the smoke inlet of waste heat boiler (5); The exhanst gas outlet of waste heat boiler (9) links to each other with the air compartment of circulating fluidized bed combustor (1) by flue gas recycled loop (11); Described flue gas recycled loop (11) is provided with recirculation blower (10).
2. according to the solid-fuelled stove pot of the described a kind of lower heat of combustion of claim 1 piece-rate system, it is characterized in that: described heavy boiler setting adopts mould brick to build by laying bricks or stones or the non-type refractory material divides three layers of cast to form, and is followed successively by refractory layer, heat insulation layer and heat-insulation layer from inside to outside; Refractory layer adopts fire clay refractory brick, and heat insulation layer is a diatomite brick, and heat-insulation layer is asbestos white clouds slabstones; The gross thickness of heavy boiler setting is 300mm～450mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110106018 CN102200276A (en) | 2011-04-26 | 2011-04-26 | Furnace-boiler separation system for combusting low-calorific-value solid fuel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110106018 CN102200276A (en) | 2011-04-26 | 2011-04-26 | Furnace-boiler separation system for combusting low-calorific-value solid fuel |
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| CN102200276A true CN102200276A (en) | 2011-09-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818261A (en) * | 2012-08-08 | 2012-12-12 | 湖南乾能新能源科技开发有限公司 | Novel circulating fluidized bed boiler |
| CN102954463A (en) * | 2012-08-08 | 2013-03-06 | 湖南乾能新能源科技开发有限公司 | Fluidized bed boiler using combustion of coal gangues |
| CN105737142A (en) * | 2016-02-05 | 2016-07-06 | 广东省特种设备检测研究院 | Waste heat comprehensive utilization system for fluidized bed |
| CN106500304A (en) * | 2015-09-07 | 2017-03-15 | 申晓丽 | A kind of energy-saving, environmental protection boiler |
| CN107975804A (en) * | 2017-12-19 | 2018-05-01 | 付顺坤 | A kind of fire grate and pyrolysis Combined garbage burning facility |
| CN107990345A (en) * | 2018-01-15 | 2018-05-04 | 王景龙 | A kind of fire coal coupled biological matter burning heating equipment |
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| JPH0972509A (en) * | 1995-09-07 | 1997-03-18 | Ishikawajima Harima Heavy Ind Co Ltd | Refuse derived fuel firing fluidized-bed boiler |
| CN1164628A (en) * | 1997-04-11 | 1997-11-12 | 清华大学 | Fluidized bed boiler for burning multicomponent low heat value fuel and operating method thereof |
| CN200949813Y (en) * | 2006-07-26 | 2007-09-19 | 大连锅炉厂 | Oil field coal-burning gas-injection boiler |
| CN101592336A (en) * | 2009-07-06 | 2009-12-02 | 宁波怡诺能源科技有限公司 | A kind of fluidized-bed combustion boiler |
| CN101776271A (en) * | 2010-03-12 | 2010-07-14 | 浙江大学 | Fluidized bed incinerating device and process suitable for treatment of waste with low heating value |
| CN202056865U (en) * | 2011-04-26 | 2011-11-30 | 清华大学 | Furnace separation system for combustion of low-calorific-value solid fuels |
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2011
- 2011-04-26 CN CN 201110106018 patent/CN102200276A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0972509A (en) * | 1995-09-07 | 1997-03-18 | Ishikawajima Harima Heavy Ind Co Ltd | Refuse derived fuel firing fluidized-bed boiler |
| CN1164628A (en) * | 1997-04-11 | 1997-11-12 | 清华大学 | Fluidized bed boiler for burning multicomponent low heat value fuel and operating method thereof |
| CN200949813Y (en) * | 2006-07-26 | 2007-09-19 | 大连锅炉厂 | Oil field coal-burning gas-injection boiler |
| CN101592336A (en) * | 2009-07-06 | 2009-12-02 | 宁波怡诺能源科技有限公司 | A kind of fluidized-bed combustion boiler |
| CN101776271A (en) * | 2010-03-12 | 2010-07-14 | 浙江大学 | Fluidized bed incinerating device and process suitable for treatment of waste with low heating value |
| CN202056865U (en) * | 2011-04-26 | 2011-11-30 | 清华大学 | Furnace separation system for combustion of low-calorific-value solid fuels |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102818261A (en) * | 2012-08-08 | 2012-12-12 | 湖南乾能新能源科技开发有限公司 | Novel circulating fluidized bed boiler |
| CN102954463A (en) * | 2012-08-08 | 2013-03-06 | 湖南乾能新能源科技开发有限公司 | Fluidized bed boiler using combustion of coal gangues |
| CN102954463B (en) * | 2012-08-08 | 2015-09-23 | 湖南乾能新能源科技开发有限公司 | A kind of fluidized-bed combustion boiler adopting coal gangue combustion |
| CN106500304A (en) * | 2015-09-07 | 2017-03-15 | 申晓丽 | A kind of energy-saving, environmental protection boiler |
| CN105737142A (en) * | 2016-02-05 | 2016-07-06 | 广东省特种设备检测研究院 | Waste heat comprehensive utilization system for fluidized bed |
| CN105737142B (en) * | 2016-02-05 | 2019-06-14 | 广东省特种设备检测研究院 | Fluidized bed waste heat comprehensive utilization system |
| CN107975804A (en) * | 2017-12-19 | 2018-05-01 | 付顺坤 | A kind of fire grate and pyrolysis Combined garbage burning facility |
| CN107990345A (en) * | 2018-01-15 | 2018-05-04 | 王景龙 | A kind of fire coal coupled biological matter burning heating equipment |
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Application publication date: 20110928 |