CN103672874A - System for desulfurizing limestone in circulating fluidized bed boiler on basis of flow state reconstruction - Google Patents
System for desulfurizing limestone in circulating fluidized bed boiler on basis of flow state reconstruction Download PDFInfo
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- CN103672874A CN103672874A CN201310692745.4A CN201310692745A CN103672874A CN 103672874 A CN103672874 A CN 103672874A CN 201310692745 A CN201310692745 A CN 201310692745A CN 103672874 A CN103672874 A CN 103672874A
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Abstract
A system for desulfurizing limestone in a circulating fluidized bed boiler on the basis of flow state reconstruction comprises a hearth, a conveying mechanism, a storage bin mechanism and a pipeline, wherein the conveying mechanism comprises a temporary storage bin, a mixer and a fan; a temporary storage feed port and an exhaust port are formed in the upper part of the temporary storage bin; the storage bin mechanism comprises a storage bin, a warehouse top dust collector, a through pipeline, an electric heater and a fan; the system further comprises an air separator communicated with an exhaust gas outlet of the hearth, a return feeder, an air chamber arranged at the bottom of the hearth and led into the hearth from a primary air duct, secondary air pipes distributed on the front wall and the rear wall of the hearth, an inlet valve set communicated with the secondary air pipes and used for desulfurizing limestone in the boiler, a tail flue arranged at the top of the separator, as well as a return feeder leg integrated with the separator; the inlet valve set is connected with the mixer through the pipeline; and the return feeder is connected with the bottom of the return feeder leg. The system has the advantages that the structure is simple, the separation efficiency is high, discharging is facilitated and the like.
Description
Technical field
The present invention relates to Circulating Fluidized Bed Boiler Equipment and stove sodalime stone desulphurization system, specifically a kind of desulfuration in furnace technology of the CFBB based on fluidised form reconstruct.
Background technology
Along with national < < fossil-fuel power plant atmospheric pollutant emission standard > > (GB13223-2011) issuing and implementation, require flue dust, sulfur dioxide, nitrogen oxide, the mercury and mercuric compounds discharge of coal-burning boiler all will reach limit value.On to the control of sulfur dioxide, the CFBB having put into operation at present, more employing desulfuration in furnace system, but the problem that ubiquity desulfuration in furnace efficiency is low, sorbent utilization is low, lime stone consumption is large.Because desulfuration in furnace reaction is closely related with boiler design parameter and running status, and the separative efficiency that CFBB based on fluidised form reconstruct has is high, gas-solid mixing is abundant, fire box temperature is reasonable, the uniform distinct advantages of fire box temperature, for desulfuration in furnace reaction provides an excellent reaction condition, combine with desulfuration in furnace system, when Ca/S=2, can reach more than 90% desulfuration efficiency, the coal that sulfur content in coal amount is less than to 1%, by this technology, can realize environment protection standard discharges, the investment of saving system greatly and construction cost, there is good marketing prospect.There is no at present the design for the desulfuration in furnace system based on fluidised form reconstruction cycle fluidized-bed combustion boiler.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, solve the ubiquitous technical problem of current conventional products, and a kind of circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct is provided.
The technical solution adopted in the present invention is: a kind of circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct, comprise burner hearth (1), conveying mechanism (7), warehouse mechanism (8), pipeline (15), described conveying mechanism (7) comprises buffering chamber (14), is arranged on the blender (13) of buffering chamber bottom, and by the blower fan (9) that pipeline (15) is connected with blender (13), on described buffering chamber top, be also provided with buffer memory charging aperture (16) and exhaust outlet (17), described warehouse mechanism (8) comprises warehouse (11), is arranged on top, the storehouse dust-precipitator (12) at warehouse (11) top, the electric heater (10) being connected with warehouse (11) lower-left side by pipeline (15) and the blower fan (9) being connected with electric heater by pipeline, the exhaust outlet (17) that buffering chamber (14) top arranges is connected with the upper right side of warehouse (11) by pipeline (15), and buffer memory charging aperture (16) is connected with the lower end of warehouse (11) by pipeline, be characterized in: it also comprise be communicated with burner hearth (1) exhanst gas outlet be arranged in parallel at burner hearth exhanst gas outlet region, inlet flue duct has a down dip, the Adiabatic Cyclone separator (2) of central tube bias, material returning device (3), be arranged on burner hearth (1) bottom from the air compartment (4) of an air channel introducing burner hearth, be distributed in the secondary air channel (5) on burner hearth (1) front-back wall, the stove sodalime stone desulfurization inlet valve group (6) being communicated with secondary air channel (5), be arranged on the back-end ductwork (18) at separator top, the returning charge dipleg (19) being integrated with separator, described inlet valve group (6) is connected with blender (13) by pipeline (15), described material returning device (3) is connected with the bottom of returning charge dipleg.
Further preferred embodiment: described separator is comprised of the refractory material back boxing of shell and three-decker, three layers of refractory material are respectively high-strength abrasion-proof castable, lightening casting material, light-weight insulating brick, and separator is provided with working temperature controller.
Further preferred embodiment: described material returning device (3) is comprised of the refractory material back boxing of shell and three-decker, three layers of refractory material are respectively high-strength abrasion-proof castable, lightening casting material, light-weight insulating brick; The returning charge elegance high pressure cold wind of described material returning device, is sent into by little blast cap, the upper installing of the female pipe of entrance airduct flowmeter, pressure gauge, and described material returning device is provided with working temperature controller.
Further preferred embodiment: the nozzle of described secondary air channel (5) is arranged on lower furnace portion material needs combustion-supporting height.
The present invention compared with prior art, has the following advantages and beneficial effect:
Based on fluidised form reconstruct minimum discharge CFBB general structure design, guarantee that the boiler furnace flue gas rate of climb is according to the one-tenth ash wear characteristic of bunker coal, keep the best flue gas rate of climb of burner hearth within the scope of 4.5～5m/s, suitable circulated material quantity guarantees boiler operatiopn bed temperature, furnace outlet gas temperature, separator material air-teturning temperature and separator outlet temperature are all in 850～880 ℃ of optimal reaction temperature intervals, the high separating efficiency of cyclone separator makes recycle stock have best material specific surface area, extend the reaction time of desulfurizing agent in stove, strengthen the captured sulfur result of desulfurizing agent, make the sulfide (SO of the actual generation of boiler combustion after the desulfurization of stove sodalime stone
x) more international common product is greatly on the low side.Add boiler furnace front-back wall overfiren air port and spray into front burning in reducing atmosphere, strong spraying into of rigidity Secondary Air is that atmosphere transfers oxygen enrichment state to, and in stove, gas-solid mixing is good, the carrying out of having strengthened desulphurization reaction.The upper and lower temperature of burner hearth is even, and high-efficiency desulfurization reaction all can occur whole burner hearth up and down.By lime stone being become to grey abrasion test, determine that the best enters stove size grading simultaneously; By limestone activity, test and determine best desulfurizing agent kind, can greatly improve desulfuration efficiency.Desulfuration efficiency, when Ca/S=2, can be guaranteed, up to more than 90%, to reach as high as 95%.The coal that is less than 1% for sulfur content, can not increase expensive afterbody desulfurizer, can reach discharge standard.The coal that is greater than 1% for sulfur content, semidry process desulfurizer after the stove of cooperation lower cost, synthesis desulfurating efficiency can be up to more than 99%, investment and operating cost are low, do not produce waste water and corrosion, can adapt to all coals, guarantee to reach boiler tail flue gas sulfide (SO in national GB13223-2011 < < fossil-fuel power plant atmospheric pollutant emission standard > >
x) discharge is less than 100mg/Nm
3requirement.The present invention is arranged in juxtaposition thermal insulation cyclone separator at furnace outlet, adopts inlet flue duct to have a down dip, the mode of central tube bias, and both simple in structure, separative efficiency is high again.
Flue gas after hearth combustion enters cyclone separator through furnace outlet, and the feed separation that flue gas is carried secretly is got off, and returns to burner hearth circulation fire by material returning device.Flue gas after separation flows to afterbody convection heating surface through central tube.Control the operating temperature in whole feed separation and returning charge loop for being conducive to super-low sulfur compound (SO
x) discharge optimum temperature.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Wherein, 1, burner hearth, 2, separator, 3, material returning device, 4, air compartment, 5, secondary air channel, 6, inlet valve group, 7, conveying mechanism, 8, warehouse mechanism, 9, blower fan, 10, electric heater, 11, warehouse, 12, top, storehouse dust-precipitator, 13, blender, 14, buffering chamber, 15, pipeline, 16, buffer memory charging aperture, 17, exhaust outlet, 18, back-end ductwork, 19, returning charge dipleg.
The specific embodiment
As shown in Figure 1, a kind of circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct, comprise burner hearth 1, conveying mechanism 7, warehouse mechanism 8, pipeline 15, described conveying mechanism 7 comprises buffering chamber 14, is arranged on the blender 13 of buffering chamber bottom, and by the blower fan 9 that pipeline 15 is connected with blender 13, on described buffering chamber top, be also provided with buffer memory charging aperture 16 and exhaust outlet 17, described warehouse mechanism 8 comprises warehouse 11, is arranged on top, the storehouse dust-precipitator 12 at warehouse 11 tops, the electric heater 10 being connected with warehouse 11 lower-left sides by pipeline 15 and the blower fan 9 being connected with electric heater by pipeline, the exhaust outlet 17 that buffering chamber 14 tops arrange is connected with the upper right side of warehouse 11 by pipeline 15, and buffer memory charging aperture 16 is connected with the lower end of warehouse 11 by pipeline, be characterized in: it also comprise be communicated with burner hearth 1 exhanst gas outlet be arranged in parallel at burner hearth exhanst gas outlet region, inlet flue duct has a down dip, the Adiabatic Cyclone separator 2 of central tube bias, material returning device 3, be arranged on burner hearth 1 bottom from the air compartment 4 of an air channel introducing burner hearth, be distributed in the secondary air channel 5 on burner hearth 1 front-back wall, the stove sodalime stone desulfurization inlet valve group 6 being communicated with secondary air channel 5, be arranged on the back-end ductwork 18 at separator top, the returning charge dipleg 19 being integrated with separator, described inlet valve group 6 is connected with blender 13 by pipeline 15, described material returning device 3 is connected with the bottom of returning charge dipleg.
Described separator is comprised of the refractory material back boxing of shell and three-decker, and three layers of refractory material are respectively high-strength abrasion-proof castable, lightening casting material, light-weight insulating brick, and separator is provided with working temperature controller.
Described material returning device 3 is comprised of the refractory material back boxing of shell and three-decker, and three layers of refractory material are respectively high-strength abrasion-proof castable, lightening casting material, light-weight insulating brick; The returning charge elegance high pressure cold wind of described material returning device, is sent into by little blast cap, the upper installing of the female pipe of entrance airduct flowmeter, pressure gauge, and described material returning device is provided with working temperature controller.
Secondary air channel, by being distributed in the secondary air channel nozzle on burner hearth front-back wall, is sent into the height space that the burning of lower furnace portion material needs air.Guarantee that burning proceeds to the oxygen-excess combustion stage from reducing atmosphere, improve efficiency of combustion, reduce afterbody unburned carbon in flue dust, during operation, secondary wind pressure just in time can penetrate anoxic zone.
Claims (4)
1. the circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct, comprise burner hearth (1), conveying mechanism (7), warehouse mechanism (8), pipeline (15), described conveying mechanism (7) comprises buffering chamber (14), is arranged on the blender (13) of buffering chamber bottom, and by the blower fan (9) that pipeline (15) is connected with blender (13), on described buffering chamber top, be also provided with buffer memory charging aperture (16) and exhaust outlet (17), described warehouse mechanism (8) comprises warehouse (11), is arranged on top, the storehouse dust-precipitator (12) at warehouse (11) top, the electric heater (10) being connected with warehouse (11) lower-left side by pipeline (15) and the blower fan (9) being connected with electric heater by pipeline, the exhaust outlet (17) that buffering chamber (14) top arranges is connected with the upper right side of warehouse (11) by pipeline (15), and buffer memory charging aperture (16) is connected with the lower end of warehouse (11) by pipeline, it is characterized in that: further comprising be communicated with burner hearth (1) exhanst gas outlet be arranged in parallel at burner hearth exhanst gas outlet region, inlet flue duct has a down dip, the Adiabatic Cyclone separator (2) of central tube bias, material returning device (3), be arranged on burner hearth (1) bottom from the air compartment (4) of an air channel introducing burner hearth, be distributed in the secondary air channel (5) on burner hearth (1) front-back wall, the stove sodalime stone desulfurization inlet valve group (6) being communicated with secondary air channel (5), be arranged on the back-end ductwork (18) at separator top, the returning charge dipleg (19) being integrated with separator, described inlet valve group (6) is connected with blender (13) by pipeline (15), described material returning device (3) is connected with the bottom of returning charge dipleg.
2. a kind of circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct according to claim 1, it is characterized in that: described separator is comprised of the refractory material back boxing of shell and three-decker, three layers of refractory material are respectively high-strength abrasion-proof castable, lightening casting material, light-weight insulating brick, and separator is provided with working temperature controller.
3. a kind of circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct according to claim 1, it is characterized in that: described material returning device (3) is comprised of the refractory material back boxing of shell and three-decker, three layers of refractory material are respectively high-strength abrasion-proof castable, lightening casting material, light-weight insulating brick; The returning charge elegance high pressure cold wind of described material returning device, is sent into by little blast cap, the upper installing of the female pipe of entrance airduct flowmeter, pressure gauge, and described material returning device is provided with working temperature controller.
4. a kind of circulating fluid bed boiler sodalime stone desulphurization system based on fluidised form reconstruct according to claim 1, is characterized in that: the nozzle of described secondary air channel (5) is arranged on the combustion-supporting height of lower furnace portion material needs.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318326A (en) * | 2015-06-16 | 2016-02-10 | 湖南联新能源环保科技股份有限公司 | High-low circulating fluidized bedboiler |
| CN105570882A (en) * | 2016-02-29 | 2016-05-11 | 太原锅炉集团有限公司 | Ultralow emission type circulating fluidized bed boiler system based on flow-state secondary reconstruction |
| CN105645113A (en) * | 2016-01-27 | 2016-06-08 | 西安航天源动力工程有限公司 | Sodium bicarbonate gathering, transporting and injecting method |
| CN105645112A (en) * | 2016-01-27 | 2016-06-08 | 西安航天源动力工程有限公司 | Sodium bicarbonate gathering, transporting and jetting complete technology system |
| CN106621785A (en) * | 2017-02-23 | 2017-05-10 | 东方电气集团东方锅炉股份有限公司 | Device and method for removing sulfur trioxide in boiler flue gas |
| CN110486719A (en) * | 2019-09-12 | 2019-11-22 | 哈尔滨红光锅炉总厂有限责任公司 | Low emission type circulating fluidized bed boiler combined desulfurization system and coordinated desulfurization method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105318326A (en) * | 2015-06-16 | 2016-02-10 | 湖南联新能源环保科技股份有限公司 | High-low circulating fluidized bedboiler |
| CN105645113A (en) * | 2016-01-27 | 2016-06-08 | 西安航天源动力工程有限公司 | Sodium bicarbonate gathering, transporting and injecting method |
| CN105645112A (en) * | 2016-01-27 | 2016-06-08 | 西安航天源动力工程有限公司 | Sodium bicarbonate gathering, transporting and jetting complete technology system |
| CN105645112B (en) * | 2016-01-27 | 2018-05-11 | 西安航天源动力工程有限公司 | A kind of sodium acid carbonate collection is defeated and sprays complete process system |
| CN105645113B (en) * | 2016-01-27 | 2018-05-11 | 西安航天源动力工程有限公司 | A kind of sodium acid carbonate collection is defeated and injection method |
| CN105570882A (en) * | 2016-02-29 | 2016-05-11 | 太原锅炉集团有限公司 | Ultralow emission type circulating fluidized bed boiler system based on flow-state secondary reconstruction |
| CN106621785A (en) * | 2017-02-23 | 2017-05-10 | 东方电气集团东方锅炉股份有限公司 | Device and method for removing sulfur trioxide in boiler flue gas |
| CN110486719A (en) * | 2019-09-12 | 2019-11-22 | 哈尔滨红光锅炉总厂有限责任公司 | Low emission type circulating fluidized bed boiler combined desulfurization system and coordinated desulfurization method |
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Application publication date: 20140326 |