CN103776027B - Cfbb - Google Patents
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- CN103776027B CN103776027B CN201410014918.1A CN201410014918A CN103776027B CN 103776027 B CN103776027 B CN 103776027B CN 201410014918 A CN201410014918 A CN 201410014918A CN 103776027 B CN103776027 B CN 103776027B
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Abstract
CFBB, is provided with fume high-temperature control zone, alkali metal cryogenic temperature condensation district successively along flow of flue gas direction in burner hearth; The flue of described burner hearth is connected with fume high-temperature control zone fume side, alkali metal cryogenic temperature condensation district fume side; The outlet of alkali metal cryogenic temperature condensation district fume side, burner hearth, the import of fume high-temperature control zone working medium side are connected successively; The working medium side outlet of fume high-temperature control zone is connected with gas-solid separating device, and the outlet of gas-solid separating device solid particle is connected with Loop Seal, and Loop Seal outlet is connected with burner hearth bottom; Arrange alkali metal crust block device in described alkali metal cryogenic temperature condensation district, alkali metal crust block device working medium side working medium is low-temperature cooling media; Arrange flue gas heating device in described fume high-temperature control zone, flue gas heating device working medium side working medium be from furnace outlet come low/alkali metal-free content low-temperature flue gas; Described alkali metal crust block device is changeable type structure, when disassembling cleaning or the replacing after the condensation of alkali metal crust block device of the alkali metal in flue gas.
Description
Technical field
The present invention relates to coal-fired fluidized bed boiler technical field, particularly a kind of CFBB based on flue-gas temperature gradient heat exchange burning high basic metal content coal.
Background technology
China is the country that a coal resource enriches, and accurate east, Xinjiang is the region of coal resources reserves enrichment.The accurate eastern coal reserves in Xinjiang is huge, and cost of winning is low, and coal reactivity is good, easy after-flame.But due to the special physical geographic environment of coal-forming history and locality, in accurate eastern coal, alkali metal is as overall higher in the content of sodium.In coal, alkali metal is the key factor that coal causes heat-transfer surface to stain in boiler combustion process, and therefore, high basic metal burning of coal utilizes and is greatly limited.At present the utilization of high basic metal coal is mainly adopted to the method for mixing and burning the weak coal of contamination, but this control method can only slow down contamination, cannot tackle the problem at its root.Therefore, eliminate the boiler heating surface pickup problem caused due to high basic metal in high basic metal coal combustion process to have important practical significance and economic worth for improving its burning utilization.
A kind of CFBB (patent publication No. 202938288U) being applied to high sodium coal and bio-fuel, within the scope of flue gas alkali metal adiabatic condensation temperature, replace convection type heat-transfer surface with vapour cold bag wall heat-transfer surface, alleviate the condensation degree of alkali metal on convection heating surface in this temperature range.A kind of flue gas recirculation steam generator system (patent publication No. 203162930U) using high sodium potassium content fuel, by flue gas recirculation device, reduce mixing smoke-box entrance flue gas temperature, alkali metal in flue gas is solidified at mixing smoke-box, reduces distillation ash at convection heating surface fouling and slagging.A kind of boiler thermodynamic system (patent publication No. 202581381U) using low ash smelting point height sodium potassium content fuel, by Enhanced Radiation Reduced Blast heat exchange area, reduce furnace exit temperature, make alkali metal in flue gas condense in furnace outlet, reduce alkali metal and condense at convection heating surface.There is certain defect in above-mentioned patent: due to by reducing flue-gas temperature, decreases the exchange heat of follow-up heat convection face and flue gas.
The present invention is based on and to condense rule for the precipitation of alkali metal under condition of different temperatures in the coal found containing the burning of high basic metal coal and experimental study on heat transfer, high and low warm area is set, at low-temperature space condensation alkali metal, obtain low/alkali metal-free content flue gas, high-temperature region is utilized to be heated up by low/alkali metal-free content low-temperature flue gas, reclaim heat, overcome above-mentioned patent shortcoming.Boiler heat exchange face crust block problem can not only be solved, and can greatly utilize fuel combustion heat, flexible arrangement heat-transfer surface, be conducive to the maximization of boiler.
Summary of the invention
The present invention will overcome the above-mentioned shortcoming of prior art, provides a kind of CFBB of the high-alkali coal that burns based on thermograde heat exchange.
Technical solution of the present invention is as follows:
CFBB, is characterized in that: be provided with fume high-temperature control zone 2, alkali metal cryogenic temperature condensation district 3 successively along flow of flue gas direction in burner hearth 1,
The flue of described burner hearth 1 is connected with fume high-temperature control zone 2 fume side, alkali metal cryogenic temperature condensation district 3 fume side,
The import of alkali metal cryogenic temperature condensation district 3 fume side, fume high-temperature control zone 2 working medium side is connected,
Fume high-temperature control zone 2 working medium side outlet is connected with gas-solid separating device 4, and the outlet of gas-solid separating device 4 solid particle is connected with Loop Seal 5, and Loop Seal 5 exports and is connected with bottom burner hearth 1.
Arrange alkali metal crust block device 8 in described alkali metal cryogenic temperature condensation district 3, alkali metal crust block device 8 working medium side working medium is low-temperature cooling media 6,
Arrange flue gas heating device 7 in described fume high-temperature control zone 2, flue gas heating device 7 working medium side working medium be from furnace outlet come low/alkali metal-free content low-temperature flue gas,
Described alkali metal crust block device 8 is changeable type structure, when disassembling cleaning or the replacing after alkali metal crust block device 8 condenses of the alkali metal in flue gas.
Described fume high-temperature control zone 2 temperature is at 550 ~ 950 DEG C, and described alkali metal cryogenic temperature condensation district 3 temperature is at 250 ~ 650 DEG C.
The flue gas that coal combustion produces, successively by being arranged in the flue gas heating device fume side in fume high-temperature control zone, alkali metal crust block device fume side, furnace outlet, flue gas heating device working medium side, the gas-solid separating device be arranged in alkali metal cryogenic temperature condensation district, finally arrives heated surface at the end of boiler.
The present invention proposes a kind of CFBB containing high basic metal composition coal based on thermograde heat exchange burning, by temperature subregion, the alkali metal in flue gas is condensed on the alkali metal crust block device in cryogenic temperature condensation district.Alkali metal cryogenic temperature condensation district low/without containing alkali low-temperature flue gas, heated up by fume high-temperature control zone, obtain low/alkali metal-free high-temperature flue gas, the clean high-temperature flue gas of these low/alkali metal-free content leads to other convection heating surface of boiler.
Advantage of the present invention is: solve the contamination problems of burning containing heating surface during high basic metal composition coal, make coal combustion heat greatly be utilized simultaneously.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention;
Fig. 2 a is fume high-temperature control zone of the present invention, alkali metal cryogenic temperature condensation district is arranged in stove
Version in thorax
Fig. 2 b is that fume high-temperature control zone of the present invention is arranged in burner hearth, alkali metal cryogenic temperature condensation
District is arranged in the version outside furnace outlet
The flue gas alkali metal crust block device that Fig. 3 a working medium side flow process is arranged in the same way and flue gas heating device arrangement form
The flue gas alkali metal crust block device of Fig. 3 b working medium side flow process arranged crosswise and flue gas heating device arrangement form
Detailed description of the invention
Below in conjunction with accompanying drawing, overall structure of the present invention is described in further detail.
In figure: 1-burner hearth, 2-fume high-temperature control zone, 3-alkali metal cryogenic temperature condensation district, 4-gas-solid separating device, 5-Loop Seal, 6-low-temperature cooling media, 7-flue gas heating device, 8-alkali metal crust block device.
As Fig. 1, technical solution of the present invention is as follows:
CFBB, is characterized in that: be provided with fume high-temperature control zone 2, alkali metal cryogenic temperature condensation district 3 successively along flow of flue gas direction in burner hearth 1,
The flue of described burner hearth 1 is connected with fume high-temperature control zone 2 fume side, alkali metal cryogenic temperature condensation district 3 fume side,
The outlet of alkali metal cryogenic temperature condensation district 3 fume side, burner hearth, the import of fume high-temperature control zone 2 working medium side are connected successively,
Fume high-temperature control zone 2 working medium side outlet is connected with gas-solid separating device 4, and the outlet of gas-solid separating device 4 solid particle is connected with Loop Seal 5, and Loop Seal 5 exports and is connected with bottom burner hearth 1.
Arrange alkali metal crust block device 8 in described alkali metal cryogenic temperature condensation district 3, alkali metal crust block device 8 working medium side working medium is low-temperature cooling media 6,
Arrange flue gas heating device 7 in described fume high-temperature control zone 2, flue gas heating device 7 working medium side working medium be from furnace outlet come low/alkali metal-free content low-temperature flue gas,
Described alkali metal crust block device 8 is changeable type structure, when disassembling cleaning or the replacing after alkali metal crust block device 8 condenses of the alkali metal in flue gas.
Described fume high-temperature control zone 2 temperature is at 550 ~ 950 DEG C, and described alkali metal cryogenic temperature condensation district 3 temperature is at 250 ~ 650 DEG C.
As shown in Figure 2, fume high-temperature control zone, alkali metal cryogenic temperature condensation district can, by a mode, be arranged in burner hearth by fume high-temperature control zone, alkali metal cryogenic temperature condensation district; By b mode, fume high-temperature control zone is arranged in burner hearth, alkali metal cryogenic temperature condensation district is arranged in outside burner hearth.
As shown in Figure 3, flue gas alkali metal crust block device and flue gas heating device are arranged can by a mode, and working medium side flow process is arranged in the same way; By b mode, working medium side flow process arranged crosswise.
Specific works principle of the present invention is:
After fuel enters primary zone, the alkali metal compound in coal evaporates, and generates high basic metal content flue gas.The flue gas that coal combustion produces, successively by being arranged in the flue gas heating device fume side in fume high-temperature control zone, alkali metal crust block device fume side, furnace outlet, flue gas heating device working medium side, the gas-solid separating device be arranged in alkali metal cryogenic temperature condensation district, finally arrives heated surface at the end of boiler.
When flue gas enters alkali metal cryogenic temperature condensation district, alkali metal crust block device working medium side passes into sub-cooled working medium, and cooling working medium can be air or water.By adjusting the flue gas flow rate of the flow of 1 cooling working medium and temperature, 2 positions of alkali metal crust block device in burner hearth, 3 fume side, and 4 boiler operating parameters are as conditions such as a Secondary Air ratio, bed temperatures, realize alkali metal cryogenic temperature condensation district temperature and control.When flue-gas temperature is down to 650 DEG C ~ 250 DEG C, the alkali metal in flue gas all condenses in crust block device surface, and now flue gas is the low-temperature flue gas of low/alkali metal-free content.
The low-temperature flue gas of low/alkali metal-free content, through furnace outlet, enters fume high-temperature control zone flue gas heating device working medium side, carries out heat exchange with high-temperature flue gas side working medium.The temperature of fume high-temperature control zone is realized by the flue gas flow rate of adjustment 1 working medium side flue gas flow rate, 2 positions of flue gas heating device in burner hearth, 3 fume side and 4 boiler operating parameters such as the conditions such as a Secondary Air ratio, bed temperature.
The flue gas heating device of low-temperature flue gas in high-temperature control district of low/alkali metal-free content heats up, temperature rises to more than 550 DEG C, obtain the high-temperature flue gas of low/alkali metal-free content, when the clean high-temperature flue gas of these low/alkali metal-free content leads to other convection heating surface of boiler, the contamination problems of burning containing heating surface during high basic metal composition coal can be solved.When alkali metal slagging scorification device surface slagging scorification degree is serious in alkali metal cryogenic temperature condensation district, alkali metal slagging scorification device can be carried out disassembly, cleaning or replacing, avoid affecting flow of flue gas state in convection pass, and avoid affecting boiler and normally run.
Claims (2)
1. CFBB, is characterized in that: be provided with fume high-temperature control zone (2), alkali metal cryogenic temperature condensation district (3) successively along flow of flue gas direction in burner hearth (1),
The flue of described burner hearth (1) is connected with fume high-temperature control zone (2) fume side, alkali metal cryogenic temperature condensation district (3) fume side,
The import of alkali metal cryogenic temperature condensation district (3) fume side, fume high-temperature control zone (2) working medium side is connected,
The outlet of fume high-temperature control zone (2) working medium side is connected with gas-solid separating device (4), and the outlet of gas-solid separating device (4) solid particle is connected with Loop Seal (5), and Loop Seal (5) outlet is connected with burner hearth (1) bottom;
Arrange alkali metal crust block device (8) in described alkali metal cryogenic temperature condensation district (3), alkali metal crust block device (8) working medium side working medium is low-temperature cooling media (6),
Arrange flue gas heating device (7) in described fume high-temperature control zone (2), flue gas heating device (7) working medium side working medium be from furnace outlet come low/alkali metal-free content low-temperature flue gas,
Described alkali metal crust block device (8) is changeable type structure, when disassembling cleaning or the replacing after alkali metal crust block device (8) condensation of the alkali metal in flue gas.
2. CFBB as claimed in claim 1, is characterized in that: described fume high-temperature control zone (2) temperature is at 550 ~ 950 DEG C, and described alkali metal cryogenic temperature condensation district (3) temperature is at 250 ~ 650 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014918.1A CN103776027B (en) | 2014-01-13 | 2014-01-13 | Cfbb |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410014918.1A CN103776027B (en) | 2014-01-13 | 2014-01-13 | Cfbb |
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| Publication Number | Publication Date |
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| CN103776027A CN103776027A (en) | 2014-05-07 |
| CN103776027B true CN103776027B (en) | 2016-01-27 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4856460A (en) * | 1987-05-09 | 1989-08-15 | Inter Power Technologie | Fluidized bed combustion |
| US4915061A (en) * | 1988-06-06 | 1990-04-10 | Foster Wheeler Energy Corporation | Fluidized bed reactor utilizing channel separators |
| CN1140482A (en) * | 1994-02-10 | 1997-01-15 | 朗马克国际动力公司 | Dual Brayton-cycle gas turbine power plant utilizing circulating pressurised fluidized bed combustor |
| CN102966944A (en) * | 2012-12-11 | 2013-03-13 | 中国东方电气集团有限公司 | CFB (Circulating Fluidized Bed)-rotary radiation boiler for reducing contamination of high-alkalinity coal |
| CN203771392U (en) * | 2014-01-13 | 2014-08-13 | 浙江大学 | Circulating fluidized bed boiler |
-
2014
- 2014-01-13 CN CN201410014918.1A patent/CN103776027B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4856460A (en) * | 1987-05-09 | 1989-08-15 | Inter Power Technologie | Fluidized bed combustion |
| US4915061A (en) * | 1988-06-06 | 1990-04-10 | Foster Wheeler Energy Corporation | Fluidized bed reactor utilizing channel separators |
| CN1140482A (en) * | 1994-02-10 | 1997-01-15 | 朗马克国际动力公司 | Dual Brayton-cycle gas turbine power plant utilizing circulating pressurised fluidized bed combustor |
| CN102966944A (en) * | 2012-12-11 | 2013-03-13 | 中国东方电气集团有限公司 | CFB (Circulating Fluidized Bed)-rotary radiation boiler for reducing contamination of high-alkalinity coal |
| CN203771392U (en) * | 2014-01-13 | 2014-08-13 | 浙江大学 | Circulating fluidized bed boiler |
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| CN103776027A (en) | 2014-05-07 |
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