CN103017153A - 300MW subcritical circulating fluidized bed boiler and working method - Google Patents

300MW subcritical circulating fluidized bed boiler and working method Download PDF

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Publication number
CN103017153A
CN103017153A CN2012105737068A CN201210573706A CN103017153A CN 103017153 A CN103017153 A CN 103017153A CN 2012105737068 A CN2012105737068 A CN 2012105737068A CN 201210573706 A CN201210573706 A CN 201210573706A CN 103017153 A CN103017153 A CN 103017153A
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China
Prior art keywords
flue
superheater
water
separator
boiler
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CN2012105737068A
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Chinese (zh)
Inventor
张彦军
王凤君
高新宇
马明华
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Harbin Boiler Co Ltd
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Harbin Boiler Co Ltd
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Priority to CN2012105737068A priority Critical patent/CN103017153A/en
Publication of CN103017153A publication Critical patent/CN103017153A/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention relates to a 300MW subcritical circulating fluidized bed boiler and a working method. Circulating fluidized bed boilers at home and abroad combust different high quality commercial coals. The 300MW subcritical circulating fluidized bed boiler provided by the invention is provided with a boiler which comprises a water supply system, a superheated steam system and a re-heated steam system. The boiler is internally provided with an H-type vertically arranged single hearth (1) and four separators. Two separators are respectively installed on the left and right sides of the hearth. The single hearth is respectively connected to a left flue (2) and a right flue (3) which are respectively connected with two separators. The outlet flues (5) of the separators are connected with a tail convection double flue (6). The single hearth is internally provided with a medium temperature screen type superheater (7) and a low temperature screen type reheater (8). An air flue combustor (9) and a bottom ash cooler (10) are connected at the bottom of the single hearth. The four separators are connected with a return valve (11) which is connected to the lower part of the single hearth. A coal economizer (12) is arranged on the lower part of the tail convection double flue, and an air preheater (13) is arranged on the lower part of the coal economizer. The 300MW subcritical circulating fluidized bed boiler and the working method provided by the invention are applied to the subcritical circulating fluidized bed boiler.

Description

300MW subcritical circulating fluidized bed boiler and method of work
Technical field:
The present invention relates to a kind of 300MW subcritical circulating fluidized bed boiler and method of work for boiler flue.
Background technology:
The fluidized-bed combustion boiler technology demonstrates its good environmental emission characteristic, and its cost of polluting control is that other technology is irreplaceable at present.Although the fluidized-bed combustion boiler technology of China is started late, but through develop rapidly in recent years, become the maximum country of fluidized-bed combustion boiler installed capacity, but generally on the low side from capacity. for this situation, China formally introduces the 300MW of ALSTOM company grade recycle fluidized-bed combustion boiler technology from China in 2003, and the fluidized-bed combustion boiler of China walks with world's pace on capacity since then.Mainly to use the best buy coal different from external fluidized-bed combustion boiler, the fluidized-bed combustion boiler of China is take inferior fuels such as spoils as main, because the foreign-made merchant lacks experience in this respect, therefore this type of type of furnace has exposed series of problems successively after putting into operation, this type of furnace domestic market of having faded out gradually, the restriction of being introduced technology in addition can't be exploited the overseas market.For better product is provided to the domestic user, optimize the structure of production, and exploit the overseas market, it is imperative to develop large volume flow fluidized bed boiler more advanced, that tally with the national condition.
Summary of the invention:
The purpose of this invention is to provide a kind of 300MW subcritical circulating fluidized bed boiler and method of work that has adopted the H type to arrange the layout that combines with the twin flue damper adjustment.
Above-mentioned purpose realizes by following technical scheme:
A kind of 300MW subcritical circulating fluidized bed boiler, its composition comprises: have water supply system, the superheated steam system, the boiler of reheating steam system, have single burner hearth and four separators that the H type is vertically arranged in the described boiler, two described separators are installed in left side at described burner hearth, two described separators are installed on right side at described burner hearth, described single burner hearth connects respectively left side flue and right side flue, described left side flue connects two described separators, described right side flue connects two described separators, described separator connects the separator outlet flue, described separator outlet flue connects afterbody convection current twin flue, middle temperature pendant superheater and low temperature screen formula reheater is housed in described single burner hearth, described single burner hearth bottom connects in-duct burner, described single lower furnace portion connects slag cooler, described four separators all connect material returning valve, described material returning valve connects described single lower furnace portion, described afterbody convection current twin flue bottom installing economizer, air preheater is equipped with in described economizer bottom.
Described 300MW subcritical circulating fluidized bed boiler, described single burner hearth comprises the combustion chamber, the evaporating heating surface of described combustion chamber is fin panel casing and water-cooling screen structure, the two water-cooled distributors of pants shape and major diameter bell-type windshield are equipped with in bottom, described combustion chamber, and described single burner hearth and described left side separator, described right side separator are by becoming the oblique flue of 10 ° of angles to be connected with level.
Described 300MW subcritical circulating fluidized bed boiler, the side wall of described combustion chamber connects described left side separator and described right side separator, described left side separator and described right side separator comprise outer cover of steel plate, the inner wearing-proof refractory material layer that connects of described outer cover of steel plate, described left side separator and separator top, described right side are the cylindrical shape part, the bottom is tapering part, described left side separator is connected material returning valve with separator bottom, described right side, described material returning valve connects the returning charge leg, described material returning valve is self-balancing type on-mechanical type material returning valve, described material returning valve bottom connects high pressure positive blower, described material returning valve comprises the material returning valve outer cover of steel plate, connect the liner insulation material layer in the described material returning valve outer cover of steel plate, described inner lining as thermal insulation material layer connects described wear-resistant material layer, described inner lining as thermal insulation material layer and described wear-resisting insulation material layer drag hook, bitch and support are fixed on the described material returning valve outer cover of steel plate.
Described 300MW subcritical circulating fluidized bed boiler, described afterbody convection current twin flue is equipped with the mid-board superheater described afterbody convection current twin flue is divided into front flue and rear pass, has described low-temperature reheater system in the described front flue, be furnished with described economizer A below the described low-temperature reheater system, have described two-stage superheater system and described economizer B in the described rear pass, has high temperature superheater in the described two-stage superheater system, low temperature superheater, arrange described low temperature superheater below the described high temperature superheater, arrange economizer below the described low temperature superheater, described twin flue top is coated by the membrane type enclosure wall superheater, described twin flue bottom is single flue, described single flue lower disposed has described air preheater, described economizer adopts H type economizer in-line arrangement or light pipe in-line arrangement, and described air preheater adopts tubular air preheater or rotary preheater.
Described 300MW subcritical circulating fluidized bed boiler, described superheater system is comprised of enclosure wall superheater, low temperature superheater, middle temperature pendant superheater, high temperature superheater, pipeline is furnished with the one-level direct-contact desuperheater between described low temperature superheater and described pendant superheater, is furnished with the secondary direct-contact desuperheater on the pipeline between described middle temperature pendant superheater and the described high temperature superheater; Described middle temperature pendant superheater is arranged in the burner hearth, and described low temperature superheater and described high temperature superheater are arranged in the back-end ductwork of described twin flue.
Described boiler is comprised of described single burner hearth, four high-temperature heat insulation separators, four described material returning valves, the described twin flue of afterbody convection current, eight slag coolers and described air preheaters.
A kind of method of work of 300MW subcritical circulating fluidized bed boiler, this method have adopted the H type to arrange the layout that combines with the twin flue damper adjustment; It is that separator is symmetrically arranged in the burner hearth both sides that the H type is arranged, separator is with being arranged symmetrically with, the twin flue damper adjustment then is that the back-end ductwork with twin flue is divided into front flue and rear pass, arrange superheater in the rear pass, arrange reheater in the front flue, realize the adjusting of reheat steam temperature by the baffle plate of adjusting the twin flue bottom;
The core that burner hearth, separator, material returning valve have consisted of CFBB is the material soft circulation circuit both, coal and lime stone are finished burning and desulphurization reaction in the combustion chamber, the flue gas that produces enters respectively four separators, carry out gas-solid two and be separated, the flue gas that purified through separator enters back-end ductwork.
Described boiler steam and water circuit is that boiler feedwater flows into economizer entrance header, economizer coiled pipe successively via electric gate valve, check-valves, water becomes adverse current upwards to flow with flue gas in the economizer coiled pipe, be pooled to the economizer exit header after being heated, guide to the stokehold through the economizer exit tube connector again, and divide two strands to enter drum from the bottom of drum;
Draw concentrated downcomer by the drum bottom, wherein a part is concentrated downcomer, causes the water-cooling screen place downwards, again by disperseing downcomer to guide the water-cooling screen entrance header of front-back wall into; Another part concentrates downcomer to be connected with the water-cooling wall lower header, supplies water to water-cooling wall separately, and the lower header of four sides water-cooling wall is interconnected;
Left side water-cooling wall, right side water-cooling wall respectively have a upper collecting chamber, it is the ceiling header that front water-cooling wall, rear water-cooling wall have a shared upper collecting chamber, water is through concentrating downcomer to enter lower header, then through side wall upper collecting chamber extremely separately, simultaneously water through front water-cooling wall, after water-cooling wall to the upper collecting chamber that shares be the ceiling header, by the carbonated drink fairlead steam water interface is caused drum again and carries out carbonated drink separation; The water that is separated reenters the drum hydrospace, and recycles, and the saturated vapor that is separated is drawn from drum top saturated vapor tube connector.
Beneficial effect:
1. the present invention adopts water-cooled distributor, the major diameter bell-type windshield, have cloth wind evenly, anti-clogging, anti-coking and be convenient to maintenance.
Arrange high temperature screen formula reheater and middle temperature pendant superheater in the burner hearth of the present invention, long-pending with the radiation heating-surface that increases superheater system and reheater system, make overheating steam temperature and reheat steam temperature have good control characteristic.
Combustion chamber of the present invention and twin flue bag the wall all horizontal band-wound rigid beam of employing prevent the distortion that the inside and outside differential pressure effect causes.
Boiler of the present invention is provided with Expansion Center, the junction of each several part flue gas, material arranges the non-metal expansion joint of excellent performance, solved the three-dimensional expansion problem that is caused by thermal walking, ripe Sealing Technology design is all adopted at each heating surface position through walls, guarantees the excellent sealing of boiler.
CFBC of the present invention is sent into the combustion chamber with the wind classification, to reduce the growing amount of NOx, except a wind of sending into from air distribution plate, also introduce Secondary Air from bottom, combustion chamber cone section minute two layers of differing heights, desulfurizing agent adopts lime stone, divide send into the material returning valve battered leg at 8 with pneumatic conveying mode, Fen Balu enters burner hearth, and combustion efficiency is good.
Boiler startup of the present invention adopts the upper Starting mode that starts burner and Induct burner combination of bed, starts with oil to save; Be furnished with two startup burners (hot smoke chest) under the bed, arrange eight startup burners on the bed.
Boiler of the present invention except in the combustion chamber, the relevant position such as separator, material returning valve arranges the nonmetal fire-resistant anti-wear material, also taked the measure of metal material abrasionproof at relevant positions such as afterbody convection heating surface, combustion chambers, moved continuously with the effective guarantee boiler safety.
Boiler of the present invention adopts a fixed form of hanging combination, and slag cooler and Air preheater are supporting construction, and material returning valve hangs combination for propping up, and all the other are overhung construction.
The inboard deslagging of air distribution plate of the present invention adopts the two air distributor structures of single burner hearth, is very beneficial for coal supply and residue extraction mechanism and arranges.Coal supply feeds from the side wall material returning valve, and end slag is discharged from pants leg zone, has so both guaranteed slag-drip opening away from coal feeding hole, has also guaranteed slag-drip opening away from the returning charge mouth, has prevented that effectively coal supply and returning charge from directly entering slag cooler, causes end slag loss,
10. the present invention adopts curtain wall to replace the structure of original external heat exchanger, does not adopt external heat exchanger, and whole steam generator system is simple, is conducive to designing institute power plant system is effectively arranged; Reheater has adopted the mode of damper adjustment, mature and reliable;
11. large capacity of the present invention puts into operation without the outer heat exchanger recirculating fluidized bed, the risk level of controlling in debugging, operation can be controlled in lowest range; Reduce the thermal inertia under boiler start/ stop and the operating modes such as removal of load, MFT, also need not the accessory systems such as emergency water compensating with high investment, more favourable to the protection of heating surface.
Superheater of the present invention and reheater system have all adopted the arrangement of convection current+radiation, compare with the arrangement of simple employing convection heating surface, and the variation of Steam Temperature for Boiler in larger load range is less.Why take such arrangement, mainly be to consider when boiler load changes, convection superheater (reheater) is opposite with the steam temperature variation characteristic of radiation superheater (reheater), in convection superheater, along with load increases, the enthalpy increase of steam, the outlet steam temperature of convection superheater will increase; And just in time opposite in the radiation superheater, along with the increase of boiler load, because smoke temperature change is little in the burner hearth, the radiant heat transfer amount increases few, do not catch up with the increase of steam flow, thereby make the enthalpy increase and decrease of working medium little, so descend with the outlet steam temperature of the increase radiation superheater of boiler load.When carrying out superheater (reheater) system, adopt radiation to combine with convection current, and take suitable caloric receptivity ratio, make overheating steam temperature and reheat steam temperature all have more stably temperature characterisitic, guarantee the stable operation of boiler under various operating modes.
The present invention is according to the characteristics of two air distributor structure burner hearths, slag cooler is arranged in the middle of the burner hearth, coal feeding hole is arranged in the burner hearth outside, can prevent coal supply and deslagging short circuit, be conducive to reduce carbon content in the bottom ash, improve efficiency of combustion, this is another innovative point that roller slag cooler is combined with two air distribution plates.
The present invention adopts " H " type economizer to have abrasionproof, reliability and comprehensive economic performance advantages of higher, simultaneously, can satisfy the long-term safety operation fully.
The present invention adopts the H type to arrange the brand-new layout of transferring the reheater steam temperature to combine with the twin flue baffle plate, adopts simultaneously roller slag cooler, the inboard deslagging of air distribution plate, and the cancellation external bed is arranged curtain wall in the burner hearth.
Description of drawings:
Accompanying drawing 1 is the structural representation of this product.
Accompanying drawing 2 is that the A-A of accompanying drawing 1 is to view.
Accompanying drawing 3 is right views of accompanying drawing 1.
Accompanying drawing 4 is steam and feed flow diagrams of accompanying drawing 1.
The specific embodiment:
Embodiment 1:
A kind of 300MW subcritical circulating fluidized bed boiler, its composition comprises: have water supply system, the superheated steam system, the boiler of reheating steam system, have single burner hearth 1 and four separators that the H type is vertically arranged in the described boiler, two described separators 4 are installed in left side at described burner hearth, two described separators are installed on right side at described burner hearth, described single burner hearth connects respectively left side flue 2 and right side flue 3, described left side flue connects two described separators, described right side flue connects two described separators, described separator connects separator outlet flue 5, described separator outlet flue connects afterbody convection current twin flue 6, middle temperature pendant superheater 7 and low temperature screen formula reheater 8 is housed in described single burner hearth, described single burner hearth bottom connects in-duct burner 9, described single lower furnace portion connects slag cooler 10, described four separators all connect material returning valve 11, described material returning valve connects described single lower furnace portion, described afterbody convection current twin flue bottom installing economizer 12, air preheater 13 is equipped with in described economizer bottom.
Embodiment 2:
Embodiment 1 described 300MW subcritical circulating fluidized bed boiler, described single burner hearth comprises the combustion chamber, the evaporating heating surface of described combustion chamber is fin panel casing and water-cooling screen structure, the two water-cooled distributors of pants shape and major diameter bell-type windshield are housed in the described combustion chamber, and described single burner hearth and described left side separator, described right side separator are by becoming the inclined tube of 10 ° of angles to be connected with level.
Embodiment 3:
Embodiment 1 or 2 described 300MW subcritical circulating fluidized bed boilers, the side wall of described combustion chamber connects described left side separator and described right side separator, described left side separator and described right side separator comprise outer cover of steel plate, the inner wearing-proof refractory material layer that connects of described outer cover of steel plate, described left side separator and separator top, described right side are the cylindrical shape part, the bottom is tapering part, described left side separator is connected material returning valve with separator bottom, described right side, described material returning valve connects returning charge and moves back, described material returning valve is self-balancing type on-mechanical type material returning valve, described material returning valve bottom connects high pressure positive blower, described material returning valve comprises the material returning valve outer cover of steel plate, connect the liner insulation material layer in the described material returning valve outer cover of steel plate, described liner insulation material layer connects described wear-resistant material layer, described liner insulation material layer and described wear-resistant material layer drag hook, bitch and support are fixed on the described material returning valve outer cover of steel plate.
Embodiment 4:
Embodiment 1 described 300MW subcritical circulating fluidized bed boiler, described afterbody convection current twin flue is equipped with the mid-board superheater described afterbody convection current twin flue is divided into front flue and rear pass, has described low-temperature reheater system in the described front flue, be furnished with described economizer A below the described low-temperature reheater system, have described two-stage superheater system and described economizer B in the described rear pass, has high temperature superheater in the described two-stage superheater system, low temperature superheater, arrange described low temperature superheater below the described high temperature superheater, arrange economizer B below the described low temperature superheater, described twin flue top is coated by the membrane type enclosure wall superheater, described twin flue bottom is single flue, described single flue lower disposed has described air preheater, described economizer adopts H type economizer in-line arrangement or light pipe in-line arrangement, and described air preheater adopts tubular air preheater or rotary preheater.
Embodiment 5:
Embodiment 1 described 300MW subcritical circulating fluidized bed boiler, described superheater system is comprised of enclosure wall superheater, low temperature superheater, middle temperature pendant superheater, high temperature superheater, pipeline is furnished with the one-level direct-contact desuperheater between described low temperature superheater and described pendant superheater, is furnished with the secondary direct-contact desuperheater on the pipeline between described middle temperature pendant superheater and the described high temperature superheater; Described middle temperature pendant superheater is arranged in the burner hearth, and described low temperature superheater and described high temperature superheater are arranged in the back-end ductwork of described twin flue.
Embodiment 6:
Embodiment 1 described 300MW subcritical circulating fluidized bed boiler, described boiler is comprised of described single burner hearth, four high-temperature heat insulation separators, four described material returning valves, the described twin flue of afterbody convection current, eight slag coolers and described air preheaters.
Embodiment 7:
A kind of method of work of 300MW subcritical circulating fluidized bed boiler, this method have adopted the H type to arrange the layout that combines with the twin flue damper adjustment; It is that separator is symmetrically arranged in the burner hearth both sides that the H type is arranged, separator is with being arranged symmetrically with, the twin flue damper adjustment then is that the back-end ductwork with twin flue is divided into front flue and rear pass, arrange superheater in the rear pass, arrange reheater in the front flue, realize the adjusting of reheat steam temperature by the baffle plate of adjusting the twin flue bottom;
The core that burner hearth, separator, material returning valve have consisted of CFBB is the material soft circulation circuit both, coal and lime stone are finished burning and desulphurization reaction in the combustion chamber, the flue gas that produces enters respectively four separators, carry out gas-solid two and be separated, the flue gas that purified through separator enters back-end ductwork.
Embodiment 8:
The method of work of embodiment 7 described 300MW subcritical circulating fluidized bed boilers, described boiler steam and water circuit is that boiler feedwater flows into economizer entrance header, economizer coiled pipe successively via electric gate valve, check-valves, water becomes adverse current upwards to flow with flue gas in the economizer coiled pipe, be pooled to the economizer exit header after being heated, guide to the stokehold through the economizer exit tube connector again, and divide two strands to enter drum from the bottom of drum;
Draw concentrated downcomer by the drum bottom, wherein a part is concentrated downcomer, causes the water-cooling screen place downwards, again by disperseing downcomer to guide the water-cooling screen entrance header of front-back wall into; Another part concentrates downcomer to be connected with the water-cooling wall lower header, supplies water to water-cooling wall separately, and the lower header of four sides water-cooling wall is interconnected;
Left side water-cooling wall, right side water-cooling wall respectively have a upper collecting chamber, it is the ceiling header that front water-cooling wall, rear water-cooling wall have a shared upper collecting chamber, water is through concentrating downcomer to enter lower header, then through side wall upper collecting chamber extremely separately, simultaneously water through front water-cooling wall, after water-cooling wall to the upper collecting chamber that shares be the ceiling header, by the carbonated drink fairlead steam water interface is caused drum again and carries out carbonated drink separation; The water that is separated reenters the drum hydrospace, and recycles, and the saturated vapor that is separated is drawn from drum top saturated vapor tube connector.
Embodiment 9:
The described 300MW subcritical circulating fluidized bed boiler of above-described embodiment, the heating surface in the H type economizer, back-end ductwork is when arranging, choose suitable average flue gas flow rate according to ash content in cigarette temperature, the flue gas, avoid average cigarette speed too high, heating surface wear is fast, and adopts H type economizer.Its primary structure and performance characteristics are as follows:
Design feature: (1) high-precision fin welding, guarantee that exhaust gases passes is smooth and easy; (2) design of this kind economizer is not easy to produce wearing and tearing;
Performance characteristics: (1) reliability is high, fume side baffle plate protection bent tube section; Fin and smoke gas flow are forward arranged, reduce wear; Minimizing fume side flue gas resistance, water side pressure are fallen; Reduce operation and the cost of investment of air-introduced machine and feed pump.
(2) reduce dust stratification, smoke gas flow is clear and coherent smooth; Has the fin pitch that well prevents ash cutting; Guarantee to blow to greatest extent grey effect.
(3) can save the space; In sum, adopt " H " type economizer to have abrasionproof, reliability and comprehensive economic performance advantages of higher, simultaneously, can satisfy the long-term safety operation fully.
Embodiment 10:
The described 300MW subcritical circulating fluidized bed boiler of above-described embodiment, the superheated steam system flow enters the saturated vapor fairlead by drum and enters back-end ductwork both sides Bao Qiang and enter before and after the back-end ductwork bag wall and enter the back-end ductwork midfeather and enter low temperature superheater and enter the one-level attemperator and enter pendant superheater and enter the secondary attemperator to high temperature superheater.
Embodiment 11:
The described 300MW subcritical circulating fluidized bed boiler of above-described embodiment, the reheating steam system flow process is that the steam from steam turbine high-pressure cylinder enters reheater entrance header by two ends, introducing is positioned at the low-temperature reheater coil of the left flue of tail vertical well, steam counter-flow and on enter cold section reheater outlet header, draw from the header two ends again, guide the stokehold into through tube connector, upwards enter hot arc reheater outlet header via distributing header to enter high temperature screen formula reheater, draw at the last two ends of reheated steam that reach 540 ℃, enters Steam Turbine Through IP Admission.

Claims (8)

1. 300MW subcritical circulating fluidized bed boiler, its composition comprises: have water supply system, the superheated steam system, the boiler of reheating steam system, it is characterized in that: have single burner hearth and four separators that the H type is vertically arranged in the described boiler, two described separators are installed in left side at described burner hearth, two described separators are installed on right side at described burner hearth, described single burner hearth connects respectively left side flue and right side flue, described left side flue connects two described separators, described right side flue connects two described separators, described separator connects the separator outlet flue, described separator outlet flue connects afterbody convection current twin flue, middle temperature pendant superheater and low temperature screen formula reheater is housed in described single burner hearth, described single burner hearth bottom connects in-duct burner, described single lower furnace portion connects slag cooler, described four separators all connect material returning valve, described material returning valve connects described single lower furnace portion, described afterbody convection current twin flue bottom installing economizer, air preheater is equipped with in described economizer bottom.
2. 300MW subcritical circulating fluidized bed boiler according to claim 1, it is characterized in that: described single burner hearth comprises the combustion chamber, the evaporating heating surface of described combustion chamber is fin panel casing and water-cooling screen structure, the two water-cooled distributors of pants shape and major diameter bell-type windshield are equipped with in bottom, described combustion chamber, and described single burner hearth and described left side separator, described right side separator are by becoming the oblique flue of 10 ° of angles to be connected with level.
3. 300MW subcritical circulating fluidized bed boiler according to claim 1 and 2, it is characterized in that: the side wall of described combustion chamber connects described left side separator and described right side separator, described left side separator and described right side separator comprise outer cover of steel plate, the inner wearing-proof refractory material layer that connects of described outer cover of steel plate, described left side separator and separator top, described right side are the cylindrical shape part, the bottom is tapering part, described left side separator is connected material returning valve with separator bottom, described right side, described material returning valve connects the returning charge leg, described material returning valve is self-balancing type on-mechanical type material returning valve, described material returning valve bottom connects high pressure positive blower, described material returning valve comprises the material returning valve outer cover of steel plate, connect the liner insulation material layer in the described material returning valve outer cover of steel plate, described inner lining as thermal insulation material layer connects described wear-resistant material layer, described inner lining as thermal insulation material layer and described wear-resisting insulation material layer drag hook, bitch and support are fixed on the described material returning valve outer cover of steel plate.
4. 300MW subcritical circulating fluidized bed boiler according to claim 1, it is characterized in that: described afterbody convection current twin flue is equipped with the mid-board superheater described afterbody convection current twin flue is divided into front flue and rear pass, has described low-temperature reheater system in the described front flue, be furnished with described economizer A below the described low-temperature reheater system, have described two-stage superheater system and described economizer B in the described rear pass, has high temperature superheater in the described two-stage superheater system, low temperature superheater, arrange described low temperature superheater below the described high temperature superheater, arrange economizer B below the described low temperature superheater, described twin flue top is coated by the membrane type enclosure wall superheater, described twin flue bottom is single flue, described single flue lower disposed has described air preheater, described economizer adopts H type economizer in-line arrangement or light pipe in-line arrangement, and described air preheater adopts tubular air preheater or rotary preheater.
5. according to claim 1 or 4 described 300MW subcritical circulating fluidized bed boilers, it is characterized in that: described superheater system is comprised of enclosure wall superheater, low temperature superheater, middle temperature pendant superheater, high temperature superheater, pipeline is furnished with the one-level direct-contact desuperheater between described low temperature superheater and described pendant superheater, is furnished with the secondary direct-contact desuperheater on the pipeline between described middle temperature pendant superheater and the described high temperature superheater; Described middle temperature pendant superheater is arranged in the burner hearth, and described low temperature superheater and described high temperature superheater are arranged in the back-end ductwork of described twin flue.
6. 300MW subcritical circulating fluidized bed boiler according to claim 1, it is characterized in that: described boiler is comprised of described single burner hearth, four described high-temperature heat insulation separators, four described material returning valves, the described twin flue of afterbody convection current, eight slag coolers and described air preheaters.
7. the method for work of a 300MW subcritical circulating fluidized bed boiler is characterized in that: the layout that this method has adopted H type layout to combine with the twin flue damper adjustment; It is that separator is symmetrically arranged in the burner hearth both sides that the H type is arranged, separator is with being arranged symmetrically with, the twin flue damper adjustment then is that the back-end ductwork with twin flue is divided into front flue and rear pass, arrange superheater in the rear pass, arrange reheater in the front flue, realize the adjusting of reheat steam temperature by the baffle plate of adjusting the twin flue bottom;
The core that burner hearth, separator, material returning valve have consisted of CFBB is the material soft circulation circuit both, coal and lime stone are finished burning and desulphurization reaction in the combustion chamber, the flue gas that produces enters respectively four separators, carry out gas-solid two and be separated, the flue gas that purified through separator enters back-end ductwork.
8. the method for work of 300MW subcritical circulating fluidized bed boiler according to claim 7, it is characterized in that: described boiler steam and water circuit is that boiler feedwater flows into economizer entrance header, economizer coiled pipe successively via electric gate valve, check-valves, water becomes adverse current upwards to flow with flue gas in the economizer coiled pipe, be pooled to the economizer exit header after being heated, guide to the stokehold through the economizer exit tube connector again, and divide two strands to enter drum from the bottom of drum;
Draw concentrated downcomer by the drum bottom, wherein a part is concentrated downcomer, causes the water-cooling screen place downwards, again by disperseing downcomer to guide the water-cooling screen entrance header of front-back wall into; Another part concentrates downcomer to be connected with the water-cooling wall lower header, supplies water to water-cooling wall separately, and the lower header of four sides water-cooling wall is interconnected;
Left side water-cooling wall, right side water-cooling wall respectively have a upper collecting chamber, it is the ceiling header that front water-cooling wall, rear water-cooling wall have a shared upper collecting chamber, water is through concentrating downcomer to enter lower header, then through side wall upper collecting chamber extremely separately, simultaneously water through front water-cooling wall, after water-cooling wall to the upper collecting chamber that shares be the ceiling header, by the carbonated drink fairlead steam water interface is caused drum again and carries out carbonated drink separation; The water that is separated reenters the drum hydrospace, and recycles, and the saturated vapor that is separated is drawn from drum top saturated vapor tube connector.
CN2012105737068A 2012-12-26 2012-12-26 300MW subcritical circulating fluidized bed boiler and working method Pending CN103017153A (en)

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CN105444144A (en) * 2015-12-24 2016-03-30 哈尔滨锅炉厂有限责任公司 300MWCFB boiler and distribution method for oil shale for combustion
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