CN103486574B - Large-scale low First air power consumption supercritical circulating fluidized bed boiler - Google Patents
Large-scale low First air power consumption supercritical circulating fluidized bed boiler Download PDFInfo
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Abstract
The large-scale low First air power consumption supercritical circulating fluidized bed boiler of the present invention relate to a kind of thermal power station use the burning anthracite with supercritical parameter, Low Volatile Lean Coal, meager coal, bituminous coal, brown coal supporting turbine generator acc power be greater than, equal the CFBB of 600MW.Adopt the burner hearth be made up of fin panel casing of large breadth depth ratio, word order along the wide equally distributed polylith air distribution plate of stove; In the speed governing heat primary air machine of every block air distribution plate and corresponding sections, cyclone separator, speed governing fluidized air blower, weighing coal feeder, fin panel casing, stove, auxiliary heating surface forms a controlled thermic load unit; Each speed governing heat primary air machine sucks the hot blast of two points of storehouse rotary regenerative air preheater air side outlets, sends into a corresponding air compartment after supercharging.Present invention significantly reduces First air power consumption; The remarkable reduction reheat system pressure loss, reduces unit hear rate; Modular construction, is easy to design, manufactures large and super-critical CFBB.
Description
(1) technical field:
The large-scale low First air power consumption supercritical circulating fluidized bed boiler of the present invention relate to a kind of thermal power station use the burning anthracite with supercritical parameter, Low Volatile Lean Coal, meager coal, bituminous coal, brown coal supporting turbine generator acc power be greater than, equal the CFBB of 600MW.
(2) background technology:
CFBB and pulverized-coal fired boiler are the station boilers of the most frequently used different combustion systems of two classes.
Boiler hearth of circulating fluidized bed ignition temperature is generally 850 DEG C to 950 DEG C, and far below Pulverized Fuel Boiler Furnace ignition temperature, the N0x concentration of emission of CFBB is far below coal-powder boiler, and most cases can be up to standard without the need to SCR.
Boiler hearth of circulating fluidized bed ignition temperature is also that the optimum temperature of stove sodalime stone desulfurization is interval, and as control Ca/S mol ratio is suitable, desulfuration in furnace rate can be greater than 90%.
Pulverized-coal fired boiler, particularly uses the maximization problem of coal-powder boiler of bituminous coal, meager coal, successfully solves, and the pulverized-coal fired boiler of domestic existing tens of 1000MW grades is put into commercial operation.
The maximization process of CFBB is still underway, and at present, the recirculating fluidized bed station boiler that the whole world has been gone into operation maximum is 600MW grade.
The maximize first problem that runs into of CFBB is the maximization of fluidized bed air distribution plate, and the technology path of prior art is single air distribution plate → bis-air distribution plate → annular air distribution plate.
CFBB maximize promote the Second Problem that runs into be First air power consumption occupy high-leveled and difficult under, CFBB is without the need to coal pulverizer, but the station service power consumption rate of CFBB is usually above coal-powder boiler, and First air power consumption is too high is its main cause.The reason that further analysis prior art CFBB First air power consumption is high mainly contains 3: 1, primary air ratio is up to 40% to 60% of total blast volume; 2, specified primary air pressure is high, can reach 32kPa or higher, and on blast governor motion, energy loss is large; Although 3 have employed 4 points of storehouse rotary regenerative air preheaters, primary air leakage is still up to 20%.
Prior art adopts cold primary air fan 2, and cold First air is heated as heat primary air through rotary regenerative air preheater, and through heat primary air road, air compartment, air distribution plate send into burner hearth.
(3) summary of the invention:
Technical problem to be solved:
Find and be applicable to the General Arrangement Scheme of large circulating fluidized bed boiler, the arrangement of fluidized bed air distribution plate; Find the First air wind turbine layout mode, First air Fan Regulation mode, rotary regenerative air preheater form, the primary air system that are applicable to large circulating fluidized bed boiler, significantly to reduce First air power consumption.
Solve the technical scheme that its technical problem adopts:
The large-scale low First air power consumption supercritical circulating fluidized bed boiler of the present invention takes the diverse technology path with prior art, and the supporting turbine generator acc power of the burning anthracite with supercritical parameter providing a kind of thermal power station to use, Low Volatile Lean Coal, meager coal, bituminous coal, brown coal is greater than, equals the CFBB of 600MW.
The large-scale low First air power consumption supercritical circulating fluidized bed boiler of the present invention comprises the burner hearth be made up of fin panel casing of large breadth depth ratio, the polylith air distribution plate of word order, the multiple First air bellows corresponding with air distribution plate number, the multiple stage speed governing heat primary air machine corresponding with air distribution plate number, the multiple cyclone separators corresponding with air distribution plate number, the multiple stage speed governing fluidized air blower corresponding with air distribution plate number, the multiple stage weighing coal feeder corresponding with air distribution plate number, level connection joint flue, back-end ductwork, be arranged in the high temperature superheater inside burner hearth front wall, be arranged in the high temperature reheater inside burner hearth front wall, be arranged in the low-temperature reheater in flue before afterbody, be arranged in the low temperature superheater in afterbody rear pass, be arranged in the economizer in back-end ductwork, two points of storehouse rotary regenerative air preheaters, the large bellows of hot Secondary Air, pressure fan, pressure fan outlet turns off baffle plate, air supply duct contact baffle plate, the hot Secondary Air of air preheater turns off baffle plate, heat primary air machine entrance turns off baffle plate, the outlet of heat primary air machine turns off baffle plate, polylith air distribution plate is uniformly distributed along stove is wide, and in the speed governing heat primary air machine of every block air distribution plate and corresponding sections, cyclone separator, speed governing fluidized air blower, weighing coal feeder, fin panel casing, stove, auxiliary heating surface forms a controlled thermic load unit, unit DCS controls each speed governing heat primary air machine, speed governing fluidized air blower and weighing coal feeder makes boiler output parameter reach desired value, that to be primary air flow make exhaust gas temperature drop to secondary air flow sum to the air capacity that the air side of two points of storehouse rotary regenerative air preheaters flows through is lower than coal-powder boiler, each speed governing heat primary air machine turns off through heat primary air machine entrance the hot blast that baffle plate sucks the outlet of rotary regenerative air preheater air side, after supercharging, baffle plate is turned off through the outlet of heat primary air machine, send into a corresponding air compartment, the rotating speed changing speed governing heat primary air machine can the blast of the corresponding air compartment of fine adjustment, under unit DCS controls, both the blast of each air compartment can be transferred to highly consistent air distribution even, also can change separately the blast of certain air compartment to adapt to the needs of this unit fluidized bed pressure and furnace charge circulation.
The beneficial effect of the invention:
Polylith air distribution plate is uniformly distributed along stove is wide, and in the speed governing heat primary air machine of every block air distribution plate and corresponding sections, cyclone separator, speed governing fluidized air blower, weighing coal feeder, fin panel casing, stove, auxiliary heating surface forms a controlled thermic load unit;
Each block air distribution plate area significantly declines, and the design First air pressure drop that air distribution plate needs reduces;
The bleed amount of flue gas of First air is 0, and the bleed amount of Secondary Air of First air is also 0;
The primary air pressure that each block air distribution plate needs is supplied by corresponding speed governing primary air fan, and the average primary air ratio of full stove declines, efficient low-power consumption;
Simplify the structure of rotary regenerative air preheater, become 2 points of storehouses from 4 points of storehouses, the air leakage coefficient of rotary regenerative air preheater can accomplish 4% or lower;
Facilitate front wall collocation half radiant superheater, reheater heating surface, without the need to arranging external heat exchanger;
Half radioactive high temperature superheater, high temperature reheater heating surface are designed to the full hydrophobic type heating surface once declined, and can clean the oxide skin inside heating surface when boiler overhaul with EDTA;
By Outlet Header of High-temperature Superheater, high temperature reheater outlet header low position, significantly can shorten main steam pipe and reheating vapour hot arc length of tube, significantly reduce capital expenditure;
The remarkable reduction reheat system pressure loss, improves unit efficiency of thermal cycle, reduces unit hear rate;
Compared with annular air distribution plate scheme, not only structure simplifies cost decline, also significantly reduces the reheat system pressure loss, reduces unit hear rate;
With pulverized-coal fired boiler, particularly with use anthracitic coal-powder boiler and compare with the coal-powder boiler using brown coal, environmental-protecting performance is superior, and peaking performance is winning, and minimum oil steady combustion load of not throwing can reach 30%BMCR;
Modular construction, is easy to maximize, and can be used for the CFBB of design, the burning anthracite manufacturing 1000MW grade, Low Volatile Lean Coal, meager coal, bituminous coal, brown coal.
(4) accompanying drawing illustrates:
Fig. 1 is large-scale low First air power consumption supercritical circulating fluidized bed boiler layout drawing.
Fig. 2 is speed governing heat primary air blower fan system figure.
In fig. 1 and 2:
1 burner hearth, 2 air distribution plates,
3 cyclone separators, 4 level connection joint flues,
5 low-temperature reheaters, 6 low temperature superheaters,
7 rotary regenerative air preheaters, 8 back-end ductworks,
9 pressure fan air suction inlets, 10 pressure fan,
11 pressure fan outlets turn off baffle plate, baffle plates got in touch with by 12 air supply ducts,
The hot Secondary Air of 13 air preheater turns off baffle plate, 14 heat primary air machine entrances turn off baffle plate,
15 speed governing heat primary air machines, 16 heat primary air machine outlet shutoff baffle plates,
17 First air bellows, the large bellows of 18 hot Secondary Air.
(5) detailed description of the invention:
Embodiment 1:
Existing composition graphs 1 is with a 1000MW grade, and the design load of Stream temperature degree/reheat steam temperature degree is the single reheat low First air power consumption supercritical circulating fluidized bed boiler of 605 DEG C/613 DEG C is that example illustrates the preferred embodiment realizing invention.
The large-scale low First air power consumption supercritical circulating fluidized bed boiler of the present invention comprises the burner hearth be made up of fin panel casing of large breadth depth ratio, 6 pieces of air distribution plates of word order, 6 First air bellows, 6 speed governing heat primary air machines, 6 cyclone separators, 6 speed governing fluidized air blowers, 6 weighing coal feeders, level connection joint flue, back-end ductwork, be arranged in the high temperature superheater inside burner hearth front wall, be arranged in the high temperature reheater inside burner hearth front wall, be arranged in the low-temperature reheater in flue before afterbody, be arranged in the low temperature superheater in afterbody rear pass, be arranged in the economizer in back-end ductwork, two points of storehouse rotary regenerative air preheaters, the large bellows of hot Secondary Air, pressure fan, pressure fan outlet turns off baffle plate, air supply duct contact baffle plate, the hot Secondary Air of air preheater turns off baffle plate, heat primary air machine entrance turns off baffle plate, the outlet of heat primary air machine turns off baffle plate, 6 pieces of air distribution plates are uniformly distributed along stove is wide, and in the speed governing heat primary air machine of every block air distribution plate and corresponding sections, cyclone separator, speed governing fluidized air blower, weighing coal feeder, fin panel casing, stove, auxiliary heating surface forms a controlled thermic load unit, unit DCS controls each speed governing heat primary air machine, speed governing fluidized air blower and weighing coal feeder makes boiler output parameter reach desired value, that to be primary air flow make exhaust gas temperature drop to secondary air flow sum to the air capacity that the air side of two points of storehouse rotary regenerative air preheaters flows through is lower than coal-powder boiler, each speed governing heat primary air machine turns off through heat primary air machine entrance the hot blast that baffle plate sucks the outlet of rotary regenerative air preheater air side, after supercharging, baffle plate is turned off through the outlet of heat primary air machine, send into a corresponding air compartment, the rotating speed changing speed governing heat primary air machine can the blast of the corresponding air compartment of fine adjustment, under unit DCS controls, both the blast of each air compartment can be transferred to highly consistent air distribution even, also can change separately the blast of certain air compartment to adapt to the needs of this unit fluidized bed pressure and furnace charge circulation.
Fin panel casing adopts riffled tube, and the segmentation of water-cooling wall lower collecting box, front wall and rear wall are respectively divided into 6 closed circuits, and both walls is respectively divided into 3 closed circuits, and 1 larger loop is established in centre, and 1 comparatively minor loop respectively established by forward and backward corner pipe.
Air distribution plate, under BMCR operating mode, designs windage 3kPa, air-cooled, the cylindrical blast cap of non-cap head.
Speed governing heat primary air machine is the low-specific-speed of particular design, single-stage, single suction, frequency control, centrifugal type efficient ventilation blower, design work temperature 350 DEG C, under BMCR operating mode, total head rises 16kPa, is furnished with inlet guide blade regulating apparatus, and institute joins power frequency when asynchronous machine allows to make a call to 20 DEG C of air and directly starts.
Gas baffle is provided with, for regulating reheat steam temperature in back-end ductwork.
Be arranged in high temperature superheater inside burner hearth front wall and the high temperature reheater be arranged in inside burner hearth front wall and be the half radiant type heating surface that steam once flows downward, Outlet Header of High-temperature Superheater, high temperature reheater outlet header low position.
Two points of storehouse rotary regenerative air preheaters are furnished with intelligent adjustable flexibility sealing system, and long-term air leak rate of air curtain can lower than 4%, and low-temperature zone adopts large ripple stainless steel heat transfer element, designs inlet temperature 330 DEG C under BMCR operating mode, exhaust gas temperature 110 DEG C.
Speed governing fluidized air blower is the roots blower of frequency control, and suck air through filter screen, 1 speed governing fluidized air blower joined by every platform cyclone separator, arranges communicating door, emergency duty each other between every 2 speed governing fluidized air blowers.
Embodiment 2:
With a 600MW grade, the design load of Stream temperature degree/reheat steam temperature degree is the single reheat the using brown coal low First air power consumption supercritical circulating fluidized bed boiler of 605 DEG C/613 DEG C is that example illustrates the preferred embodiment realizing invention.
The large-scale low First air power consumption supercritical circulating fluidized bed boiler of the present invention comprises the burner hearth be made up of fin panel casing of large breadth depth ratio, 4 pieces of air distribution plates of word order, 4 First air bellows, 4 speed governing heat primary air machines, 4 cyclone separators, 4 speed governing fluidized air blowers, 4 weighing coal feeders, level connection joint flue, back-end ductwork, be arranged in the high temperature superheater inside burner hearth front wall, be arranged in the high temperature reheater inside burner hearth front wall, be arranged in the low-temperature reheater in flue before afterbody, be arranged in the low temperature superheater in afterbody rear pass, be arranged in the economizer in back-end ductwork, two points of storehouse rotary regenerative air preheaters, the large bellows of hot Secondary Air, pressure fan, pressure fan outlet turns off baffle plate, air supply duct contact baffle plate, the hot Secondary Air of air preheater turns off baffle plate, heat primary air machine entrance turns off baffle plate, the outlet of heat primary air machine turns off baffle plate, 4 pieces of air distribution plates are uniformly distributed along stove is wide, and in the speed governing heat primary air machine of every block air distribution plate and corresponding sections, cyclone separator, speed governing fluidized air blower, weighing coal feeder, fin panel casing, stove, auxiliary heating surface forms a controlled thermic load unit, unit DCS controls each speed governing heat primary air machine, speed governing fluidized air blower and weighing coal feeder makes boiler output parameter reach desired value, that to be primary air flow make exhaust gas temperature drop to secondary air flow sum to the air capacity that the air side of two points of storehouse rotary regenerative air preheaters flows through is lower than coal-powder boiler, each speed governing heat primary air machine turns off through heat primary air machine entrance the hot blast that baffle plate sucks the outlet of rotary regenerative air preheater air side, after supercharging, baffle plate is turned off through the outlet of heat primary air machine, send into a corresponding air compartment, the rotating speed changing speed governing heat primary air machine can the blast of the corresponding air compartment of fine adjustment, under unit DCS controls, both the blast of each air compartment can be transferred to highly consistent air distribution even, also can change separately the blast of certain air compartment to adapt to the needs of this unit fluidized bed pressure and furnace charge circulation.
Fin panel casing adopts riffled tube, and the segmentation of water-cooling wall lower collecting box, front wall and rear wall are respectively divided into 4 closed circuits, and both walls is respectively divided into 3 closed circuits, and 1 larger loop is established in centre, and 1 comparatively minor loop respectively established by forward and backward corner pipe.
Air distribution plate, under BMCR operating mode, designs windage 3kPa, air-cooled, the cylindrical blast cap of non-cap head.
Speed governing heat primary air machine is the low-specific-speed of particular design, single-stage, single suction, frequency control, centrifugal type efficient ventilation blower, design work temperature 350 DEG C, under BMCR operating mode, total head rises 16kPa, is furnished with inlet guide blade regulating apparatus, and institute joins power frequency when asynchronous machine allows to make a call to 20 DEG C of air and directly starts.
Gas baffle is provided with, for regulating reheat steam temperature in back-end ductwork.
Be arranged in high temperature superheater inside burner hearth front wall and the high temperature reheater be arranged in inside burner hearth front wall and be the half radiant type heating surface that steam once flows downward, Outlet Header of High-temperature Superheater, high temperature reheater outlet header low position.
Two points of storehouse rotary regenerative air preheaters are furnished with intelligent adjustable flexibility sealing system, and long-term air leak rate of air curtain can lower than 4%, and low-temperature zone adopts large ripple stainless steel heat transfer element, designs inlet temperature 330 DEG C under BMCR operating mode, exhaust gas temperature 110 DEG C.
Speed governing fluidized air blower is the roots blower of frequency control, and suck air through filter screen, 1 speed governing fluidized air blower joined by every platform cyclone separator, arranges communicating door, emergency duty each other between every 2 speed governing fluidized air blowers.
Claims (8)
1. a large-scale low First air power consumption supercritical circulating fluidized bed boiler, is characterized in that: the burner hearth be made up of fin panel casing comprising large breadth depth ratio, the polylith air distribution plate of word order, the multiple First air bellows corresponding with air distribution plate number, the multiple stage speed governing heat primary air machine corresponding with air distribution plate number, the multiple cyclone separators corresponding with air distribution plate number, the multiple stage speed governing fluidized air blower corresponding with air distribution plate number, the multiple stage weighing coal feeder corresponding with air distribution plate number, level connection joint flue, back-end ductwork, be arranged in the high temperature superheater inside burner hearth front wall, be arranged in the high temperature reheater inside burner hearth front wall, be arranged in the low-temperature reheater in flue before afterbody, be arranged in the low temperature superheater in afterbody rear pass, be arranged in the economizer in back-end ductwork, two points of storehouse rotary regenerative air preheaters, the large bellows of hot Secondary Air, pressure fan, pressure fan outlet turns off baffle plate, air supply duct contact baffle plate, the hot Secondary Air of air preheater turns off baffle plate, heat primary air machine entrance turns off baffle plate, the outlet of heat primary air machine turns off baffle plate, polylith air distribution plate is uniformly distributed along stove is wide, and in the speed governing heat primary air machine of every block air distribution plate and corresponding sections, cyclone separator, speed governing fluidized air blower, weighing coal feeder, fin panel casing, stove, auxiliary heating surface forms a controlled thermic load unit, unit DCS controls each speed governing heat primary air machine, speed governing fluidized air blower and weighing coal feeder makes boiler output parameter reach desired value, that to be primary air flow make exhaust gas temperature drop to secondary air flow sum to the air capacity that the air side of two points of storehouse rotary regenerative air preheaters flows through is lower than coal-powder boiler, each speed governing heat primary air machine turns off through heat primary air machine entrance the hot blast that baffle plate sucks the outlet of rotary regenerative air preheater air side, after supercharging, baffle plate is turned off through the outlet of heat primary air machine, send into a corresponding air compartment, the rotating speed changing speed governing heat primary air machine can the blast of the corresponding air compartment of fine adjustment, under unit DCS controls, both the blast of each air compartment can be transferred to highly consistent air distribution even, also can change separately the blast of certain air compartment to adapt to the needs of this unit fluidized bed pressure and furnace charge circulation.
2. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, it is characterized in that described fin panel casing adopts riffled tube, the segmentation of water-cooling wall lower collecting box, front wall and rear wall are respectively divided into the multiple closed circuits corresponding with air distribution plate number, both walls is respectively divided into 3 closed circuits, 1 larger loop is established in centre, and 1 comparatively minor loop respectively established by forward and backward corner pipe.
3. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, is characterized in that described air distribution plate is under BMCR operating mode, design windage 3kPa, air-cooled, the cylindrical blast cap of non-cap head.
4. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, it is characterized in that described speed governing heat primary air machine is the low-specific-speed of particular design, single-stage, single suction, frequency control, centrifugal type efficient ventilation blower, design work temperature 350 DEG C, under BMCR operating mode, total head rises 16kPa, is furnished with inlet guide blade regulating apparatus.
5. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, is characterized in that being provided with gas baffle in described back-end ductwork, for regulating reheat steam temperature.
6. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, it is characterized in that described high temperature superheater inside burner hearth front wall and the high temperature reheater be arranged in inside burner hearth front wall of being arranged in is the half radiant type heating surface that steam once flows downward, Outlet Header of High-temperature Superheater, high temperature reheater outlet header low position.
7. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, it is characterized in that two points of described storehouse rotary regenerative air preheaters are furnished with intelligent adjustable flexibility sealing system, long-term air leak rate of air curtain can lower than 4%, low-temperature zone adopts large ripple stainless steel heat transfer element, inlet temperature 330 DEG C is designed, exhaust gas temperature 110 DEG C under BMCR operating mode.
8. large-scale low First air power consumption supercritical circulating fluidized bed boiler according to claim 1, it is characterized in that described speed governing fluidized air blower is the roots blower of frequency control, air is sucked through filter screen, 1 speed governing fluidized air blower joined by every platform cyclone separator, between every 2 speed governing fluidized air blowers, communicating door is set, emergency duty each other.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017174865A1 (en) * | 2016-04-04 | 2017-10-12 | Amec Foster Wheeler Energia Oy | A circulating fluidized bed boiler and a method for assembling a circulating fluidized bed boiler |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110793056B (en) * | 2019-11-06 | 2021-03-30 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
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| CN103486574A (en) | 2014-01-01 |
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