CN103574593A - Flow state reconfiguration control-based circulating fluidized bed boiler for sulfides - Google Patents
Flow state reconfiguration control-based circulating fluidized bed boiler for sulfides Download PDFInfo
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- CN103574593A CN103574593A CN201310552012.0A CN201310552012A CN103574593A CN 103574593 A CN103574593 A CN 103574593A CN 201310552012 A CN201310552012 A CN 201310552012A CN 103574593 A CN103574593 A CN 103574593A
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Abstract
The invention discloses a flow state reconfiguration control -based circulating fluidized bed boiler for sulfides. The circulating fluidized bed boiler comprises a hearth, a heat-insulating cyclone separator, a return feeder, an air chamber, bell type air hoods and secondary air pipes, wherein the heat-insulating cyclone separator is communicated with a smoke outlet of the hearth and is arranged in the smoke outlet region of the hearth in parallel, and an inlet flue of the heat-insulating cyclone separator inclines down and a central cylinder of the heat-insulating cyclone separator is eccentric; the return feeder is communicated with the bottom of the separator and the hearth respectively; the air chamber is connected with the lower end of the hearth through an air distribution plate; the bell type air hoods are uniformly arranged on the air distribution plate; the secondary air pipes are arranged on the front and rear walls of the hearth; the air chamber is connected with the primary air duct; a mushroom-shaped air hood is arranged at a cold air outlet of the return feeder; the air pipe which is provided with a flow meter and a pressure meter is communicated with the hearth and the return feeder. The circulating fluidized bed boiler can be used for thermal power stations, and the emission of sulfide is greatly reduced.
Description
Technical field
The present invention relates to Circulating Fluidized Bed Boiler Equipment, specifically a kind of CFBB of controlling sulfide 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.The CFBB sulfur dioxide (SO2) emissions that put into operation at present, set up the measures such as desulfurizer by in-furnace calcium spraying and afterbody, and large multipotency reaches original limit value.And for sulfide minimum discharge, utilizing of itself and boiler combustion and desulfurizing agent is closely related, controlling aspect sulfide emission index at present, there is no for whole boiler burning structure design.
Summary of the invention
Technical problem to be solved by this invention is: how a kind of whole burning in circulating fluid bed boiler structure is provided, reduces the discharge capacity of sulfide.
The technical solution adopted in the present invention is: the CFBB of controlling sulfide based on fluidised form reconstruct, comprise burner hearth, burner hearth exhanst gas outlet region, inlet flue duct have a down dip, the Adiabatic Cyclone separator of central tube bias for being arranged in parallel at of being communicated with burner hearth exhanst gas outlet, the material returning device being communicated with respectively with separator bottom and burner hearth, the air compartment being connected by air distribution plate with burner hearth lower end, be evenly arranged the bell-type windshield being arranged on air distribution plate, the secondary air channel on burner hearth front-back wall; Air compartment connects an air channel, and the outlet of material returning device high pressure cold wind has mushroom-shaped blast cap, and flowmeter, manometric airduct connection burner hearth and material returning device are installed.
As a kind of optimal way: 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, have the first working temperature controller on separator.
As a kind of optimal way: material returning device 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 material returning device is provided with the second working temperature controller.
As a kind of optimal way: air distribution plate is provided with phosphate refractory concrete layer.
As a kind of optimal way: the nozzle of secondary air channel is arranged on lower furnace portion material needs combustion-supporting height.
The invention has the beneficial effects as follows: the present invention is owing to being arranged in juxtaposition thermal insulation cyclone separator at furnace outlet, flue gas after hearth combustion enters cyclone separator through furnace outlet, the feed separation that flue gas is carried secretly is got off, and returns to burner hearth circulation fire by material returning device, and separative efficiency is very high; One time wind evenly enters burner hearth through air compartment by bell-type windshield, fluidized bed material, Secondary Air is by being distributed in the secondary air channel nozzle on burner hearth front-back wall, sending into the burning of lower furnace portion material needs the space of air, guarantee that burning proceeds to the oxygen-excess combustion stage from reducing atmosphere, improve efficiency of combustion, strengthened the captured sulfur result of desulfurizing agent.Optimizing and revising of stove internal combustion air distribution, generates the initial sulfide of boiler and is controlled at lower value.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Wherein, 1, burner hearth, 2, separator, 3, material returning device, 4, bell-type windshield, 5, air compartment, 6, secondary air channel, 7, nozzle, 8, airduct.
The specific embodiment
As shown in Figure 1, a kind of CFBB of controlling sulfide based on fluidised form reconstruct, secondary air channel is connected with desulfurization entrance in burner hearth, material returning device 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 (mushroom-shaped blast cap), the upper installing of the female pipe of entrance airduct flowmeter, pressure gauge.
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 ultralow sulfide emission optimum temperature.The part weight of the straight section of cyclone separator, cone section, dipleg and material returning device is supported on steelframe; The flue of separator outlet is suspended on furnace roof top board by suspension rod.A material returning device is all equipped with in the bottom of each separator dipleg, is provided with air distribution plate in material returning device, ash-removing mouth on air distribution plate.One time, combustion chamber wind is introduced air compartment from air channel.Air compartment and burner hearth are separated by by air distribution plate, and air distribution plate is membrane wall structure, are evenly arranged bell-type windshield on it, the accurate casting of special material, and serviceability temperature is high, has compared with the long life.For protecting cloth aerofoil, the phosphate refractory concrete thickness on air distribution plate is suitable.
Secondary Air, 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.
Basic invention guarantees 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 between 850～880 ℃ of optimum responses, range of temperature is at 30 ℃, the fire box temperature of 850～880 ℃ is positioned at the optimal reaction temperature interval of in-furnace calcium spraying, 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 after in-furnace calcium spraying the more international common product of sulfide of the actual generation of boiler combustion 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, strengthened the carrying out of desulphurization reaction.On based on fluidised form reconstruct minimum discharge CFBB, do not increase expensive afterbody wet desulphurization device, the semidry process desulfurizer that coordinates lower cost, just can reach boiler tail flue gas sulfide emission requirement in national GB13223-2011 < < fossil-fuel power plant atmospheric pollutant emission standard > >.
Claims (5)
1. based on fluidised form reconstruct, control the CFBB of sulfide, it is characterized in that: comprise burner hearth, burner hearth exhanst gas outlet region, inlet flue duct have a down dip, the Adiabatic Cyclone separator of central tube bias for being arranged in parallel at of being communicated with burner hearth exhanst gas outlet, the material returning device being communicated with respectively with separator bottom and burner hearth, the air compartment being connected by air distribution plate with burner hearth lower end, be evenly arranged the bell-type windshield being arranged on air distribution plate, the secondary air channel on burner hearth front-back wall; Air compartment connects an air channel, and the outlet of material returning device high pressure cold wind has mushroom-shaped blast cap, and flowmeter, manometric airduct connection burner hearth and material returning device are installed.
2. the CFBB of controlling sulfide based on fluidised form reconstruct according to claim 1, it is characterized in that: 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, have the first working temperature controller on separator.
3. the CFBB of controlling sulfide based on fluidised form reconstruct according to claim 1, it is characterized in that: material returning device 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 material returning device is provided with the second working temperature controller.
4. the CFBB of controlling sulfide based on fluidised form reconstruct according to claim 1, is characterized in that: air distribution plate is provided with phosphate refractory concrete layer.
5. the CFBB of controlling sulfide based on fluidised form reconstruct according to claim 1, is characterized in that: the nozzle of secondary air channel is arranged on the combustion-supporting height of lower furnace portion material needs.
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| CN201310552012.0A CN103574593A (en) | 2013-11-08 | 2013-11-08 | Flow state reconfiguration control-based circulating fluidized bed boiler for sulfides |
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| CN201310552012.0A CN103574593A (en) | 2013-11-08 | 2013-11-08 | Flow state reconfiguration control-based circulating fluidized bed boiler for sulfides |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0530969A2 (en) * | 1991-09-03 | 1993-03-10 | The Babcock & Wilcox Company | Circulating fluidized bed boiler apparatus |
| CN101725962A (en) * | 2009-11-25 | 2010-06-09 | 西安热工研究院有限公司 | Circulating fluidized bed boiler combusting low calorific value gas fuel |
| CN103075728A (en) * | 2013-02-04 | 2013-05-01 | 太原锅炉集团有限公司 | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide |
-
2013
- 2013-11-08 CN CN201310552012.0A patent/CN103574593A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0530969A2 (en) * | 1991-09-03 | 1993-03-10 | The Babcock & Wilcox Company | Circulating fluidized bed boiler apparatus |
| CN101725962A (en) * | 2009-11-25 | 2010-06-09 | 西安热工研究院有限公司 | Circulating fluidized bed boiler combusting low calorific value gas fuel |
| CN103075728A (en) * | 2013-02-04 | 2013-05-01 | 太原锅炉集团有限公司 | Flow-reconstruction based circulating fluidized bed boiler for controlling nitric oxide |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Application publication date: 20140212 |