CN210153764U - Biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler - Google Patents
Biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler Download PDFInfo
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- CN210153764U CN210153764U CN201921080173.3U CN201921080173U CN210153764U CN 210153764 U CN210153764 U CN 210153764U CN 201921080173 U CN201921080173 U CN 201921080173U CN 210153764 U CN210153764 U CN 210153764U
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Abstract
The utility model provides a living beings direct-fired energy-saving circulating fluidized bed high temperature superhigh pressure reheat steam boiler, it relates to a high temperature superhigh pressure reheat steam boiler, concretely relates to living beings direct-fired energy-saving circulating fluidized bed high temperature superhigh pressure reheat steam boiler. The utility model discloses a solve current living beings circulating fluidized bed boiler direct combustion yellow straw living beings difficulty, continuous operation duration is shorter, boiler unit inefficiency, pollutant discharge are many, the feed is not smooth, the reliability is poor, lead to the boiler fault rate higher, the difficult problem of biomass briquetting. The utility model discloses a living beings direct combustion system installs in furnace's lower part, and furnace's upper portion is connected with the upper portion of separation returning charge system, and furnace's lower part and separation returning charge system's sub-unit connection, the smoke inlet of first afterbody flue are connected with the upper portion of separation returning charge system, and the sub-unit connection of connecting flue and second afterbody flue is passed through to the lower part of first afterbody flue. The utility model belongs to electricity generation and combined heat and power generation field.
Description
Technical Field
The utility model relates to a high temperature superhigh pressure reheat steam boiler, concretely relates to living beings direct-fired energy-saving circulating fluidized bed high temperature superhigh pressure reheat steam boiler belongs to electricity generation and combined heat and power generation field.
Background
The existing biomass circulating fluidized bed boiler has the defects of difficulty in directly burning yellow straw biomass, short continuous operation time, low efficiency of a boiler unit, more pollution emission, unsmooth feeding and poor reliability, and the failure rate of the boiler is high.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve current living beings circulating fluidized bed boiler direct combustion yellow straw living beings difficulty, continuous operation duration is shorter, boiler unit inefficiency, pollutant discharge are many, the feed is not smooth, the reliability is poor, lead to the problem that boiler fault rate is higher, biomass forming is difficult, and then provide a living beings direct combustion energy-saving circulating fluidized bed high temperature superhigh pressure reheat steam boiler.
The utility model discloses a solve the technical scheme that above-mentioned problem was taken and be: the utility model discloses a furnace, first afterbody flue, connection flue and second afterbody flue, the utility model discloses still include living beings direct combustion system and separation returning charge system, living beings direct combustion system installs in furnace's lower part, and furnace's upper portion is connected with the upper portion of separation returning charge system, and furnace's lower part and separation returning charge system's sub-unit connection, the smoke inlet of first afterbody flue is connected with the upper portion of separation returning charge system, and the sub-unit connection of connecting flue and second afterbody flue is passed through to the lower part of first afterbody flue.
Further, the biomass direct-combustion system comprises a biomass direct-combustion feeding device, a material supplementing device, a secondary air device, a tertiary air device and a slag discharging device, wherein the tertiary air device, the biomass direct-combustion feeding device, the secondary air device and the material supplementing device are sequentially arranged on the lower portion of the hearth from top to bottom.
Furthermore, the separating and returning system is formed by sequentially connecting a separator and a returning device from top to bottom, a smoke outlet of the hearth is connected with the upper part of the first tail flue through the separator, and an outlet of the returning device is connected with the lower part of the hearth.
Further, the utility model discloses still include low temperature economizer, high temperature economizer, low temperature over heater, low temperature re-heater and convection bank, low temperature re-heater, low temperature over heater, high temperature economizer, low temperature economizer from top to bottom install in proper order in first afterbody flue.
Furthermore, the connecting flue comprises a first ash bucket, a flue and a second ash bucket, the first ash bucket is installed on the lower portion of the first tail flue, the second ash bucket is installed on the lower portion of the second tail flue, and the first ash bucket is connected with the second ash bucket through the flue.
Further, the utility model discloses still include subordinate air heater and higher level air heater, higher level air heater and subordinate air heater install in proper order in second afterbody flue from top to bottom.
Further, the utility model discloses still include first medium temperature overheated screen, second medium temperature overheated screen, first high temperature overheated screen, second high temperature overheated screen and high temperature reheat screen, second medium temperature overheated screen, second high temperature overheated screen, high temperature reheat screen, first high temperature overheated screen, first medium temperature overheated screen are installed in furnace by furnace one side to opposite side in proper order.
The utility model has the advantages that: the utility model is based on the realization of the low bed pressure, low bed temperature and low emission direct combustion of the agriculture and forestry biomass fuel, realizes high efficiency, cleanness and easy adjustment, constitutes the synergistic solution of the energy-saving and environment-friendly combustion and the stable load operation of the biomass direct-fired fluidized bed boiler, and achieves the direct combustion without briquetting and pelletizing of the biomass; through the low-temperature combustion system combination technology, the generation of NOx is inhibited, the continuous and stable combustion is finally realized, the pollutant discharge is low, the boiler unit is high in efficiency, the temperature is easy to adjust, and the energy waste and the environmental pollution caused by the existing biomass combustion are solved; the utility model is a circulating fluidized bed boiler directly burns yellow-rod biomass, realizes the cooperation and combination of high-efficiency, environment-friendly, continuous and stable operation, and realizes the cooperation of direct-burning biomass energy conservation, environment protection, clean and high-efficiency burning and steam-water circulation temperature regulation;
the biomass used by the utility model is not pressed into blocks or granulated, and is directly fed and combusted through the screw feeder, so that effective sealing is realized, smoke gas is effectively prevented from flowing backwards, and the problems of multiple faults, poor reliability and the like of a feeding system are solved; the biomass direct-fired feeding device is arranged at a negative pressure point at the lower part of the hearth, and biomass enters the furnace along with secondary air and tertiary air, so that feeding is effectively prevented from being unsmooth; the utility model solves the problem of high NOx emission of the existing biomass boiler, overcomes the difficult problems of generating and controlling the combustion NOx in the boiler, and forms a low NOx biomass combustion and control technology; the utility model arranges a large number of heating surfaces such as superheater and reheater in the hearth, and adopts low temperature combustion technology to control the temperature of the hearth outlet within 800 ℃, thereby reducing the generation of NOx; the primary air, the secondary air and the tertiary air can be supplied in a grading and adjustable manner to form anoxic combustion, so that the generation of NOx can be remarkably inhibited; the utility model solves the problems of low parameters and low unit efficiency of the prior biomass boiler, mainly promotes the boiler parameters, optimizes the system integration, overcomes the difficulties of boiler heat transfer, temperature regulation and the like, and completes the integral arrangement scheme of the boiler and the integration and optimization of a steam-water system; the utility model has the advantages that the main steam pressure of the boiler is 13.7MPa, the temperature of the superheated steam and the reheated steam is 540 ℃, and the efficiency of the boiler unit is improved and the biomass consumption is reduced by applying the high-temperature ultrahigh-pressure one-time reheating technology; the utility model arranges the low temperature superheater and the low temperature reheater in the tail flue, and arranges the medium temperature overheating shield, the high temperature overheating shield and the high temperature reheating shield in the furnace chamber, thereby overcoming the heat transfer problem of the high-efficiency boiler, and the double-flue design of the boiler has reasonable overall arrangement; the superheated steam adopts three-stage temperature reduction, the reheated steam adopts two-stage temperature reduction, the temperature adjustment is convenient, the safety and the reliability are realized, and the steam system integration optimization is realized; the utility model discloses the living beings that use do not briquetting, do not pelletize, solve the many, poor and the high scheduling problem of power consumption of living beings feed mechanism trouble. The feeding is directly carried out through the screw feeder, so that effective sealing is realized, smoke gas is effectively prevented from flowing backwards, and the problems of multiple faults, poor reliability and the like of a feeding system are solved; a large amount of circulating materials in the main circulating loop of the circulating fluidized bed boiler have good self-ash-cleaning property and can prevent the heating surface of the water wall from slagging. A large-caliber slag discharging pipe is arranged at the bottom of the furnace, so that small slag blocks generated in the combustion process are effectively replaced; the boiler furnace contains a large amount of materials, and a large amount of materials are carried to furnace upper portion by the flue gas in combustion process, through arranging the separator at the furnace export, separate material and flue gas to in returning the material to the bed through returning the material valve, the many times circulating combustion. Because the material concentration is high, the high-heat capacity and good material mixing are realized, so that the adaptability of the boiler to the types of the biomass fuels is strong; the utility model reasonably distributes the proportion of the first, second and third air, adjusts the combustion share in the furnace, inhibits the generation of NOx and adapts to the characteristic of large water fluctuation of the biomass; when the flue gas passes through the connecting flue, the dust is removed and discharged through the ash bucket, the flue and the ash bucket in a multi-stage separation mode, and the dust accumulation, blockage and corrosion of the air preheater are avoided.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a sectional view taken along line C-C of FIG. 1;
FIG. 3 is a schematic structural diagram of a direct biomass combustion system;
FIG. 4 is a sectional view taken along line D-D of FIG. 3;
FIG. 5 is a schematic view of the structure within the furnace;
FIG. 6 is a sectional view taken along line G-G and line J-J of FIG. 5;
fig. 7 is a schematic diagram of the structure of the separation return system.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 7, and the embodiment of the invention provides a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler, which comprises a hearth 2, a first tail flue 4, a connecting flue 5 and a second tail flue 6, and further comprises a biomass direct-fired system 1 and a separation return system 3, wherein the biomass direct-fired system 1 is installed at the lower part of the hearth 2, the upper part of the hearth 2 is connected with the upper part of the separation return system 3, the lower part of the hearth 2 is connected with the lower part of the separation return system 3, a smoke inlet of the first tail flue 4 is connected with the upper part of the separation return system 3, and the lower part of the first tail flue 4 is connected with the lower part of the second tail flue 6 through the connecting flue 5.
The lower part of the first tail flue 4 is fixedly connected with a water supply header 9.
The second embodiment is as follows: the embodiment is described with reference to fig. 1 to 7, and a biomass direct-combustion system 1 of a biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to the embodiment includes a biomass direct-combustion feeding device 1-1, a material supplementing device 1-2, a secondary air device 1-3, a tertiary air device 1-4 and a slag discharging device 1-5, wherein the tertiary air device 1-4, the biomass direct-combustion feeding device 1-1, the secondary air device 1-3 and the material supplementing device 1-2 are sequentially installed at the lower part of a furnace 2 from top to bottom.
Biomass enters the lower part of a hearth 2 to be combusted through a biomass direct-combustion feeding device 1-1, bed materials enter the lower part of the hearth 2 to be fluidized through a material supplementing device 1-2, the biomass direct-combustion feeding device 1-1 and the material supplementing device 1-2 are welded with the lower part of a front membrane type wall 15 of the hearth 2, and biomass ash after combustion is discharged through a slag discharging device 1-5 welded at the bottom of the hearth 2.
Primary air enters the hearth through the bottom of the hearth 2 to fluidize bed materials; secondary air enters the lower part of the hearth 2 through a secondary air device 1-3 to burn and support combustion of biomass; the tertiary air enters the middle lower part of the hearth 2 through the tertiary air devices 1-4 to burn out the biomass, and the anoxic low-nitrogen combustion is realized by adjusting air distribution in stages.
Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 1 to 7, and the separation material returning system 3 of the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the embodiment is formed by sequentially connecting a separator 3-1 and a material returning device 3-2 from top to bottom, a smoke outlet of a hearth 2 is connected with the upper part of a first tail flue 4 through the separator 3-1, and an outlet of the material returning device 3-2 is connected with the lower part of the hearth 2. Other components and connections are the same as those in the first embodiment.
The fourth concrete implementation mode: the present embodiment is described with reference to fig. 1 to 7, and the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the present embodiment further includes a low-temperature economizer 10, a high-temperature economizer 11, a low-temperature superheater 26, a low-temperature reheater 38, and a convection bank 20, and the convection bank 20, the low-temperature reheater 38, the low-temperature superheater 26, the high-temperature economizer 11, and the low-temperature economizer 10 are sequentially installed in the first tail flue 4 from top to bottom. Other components and connections are the same as those in the first embodiment.
The fifth concrete implementation mode: the embodiment is described with reference to fig. 1 to 7, and the connecting flue 5 of the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the embodiment includes a first ash bucket 5-1, a flue 5-2 and a second ash bucket 5-3, the first ash bucket 5-1 is installed at the lower part of a first tail flue 4, the second ash bucket 5-3 is installed at the lower part of a second tail flue 6, and the first ash bucket 5-1 is connected with the second ash bucket 5-3 through the flue 5-2. Other components and connections are the same as those in the first embodiment.
The sixth specific implementation mode: the embodiment is described with reference to fig. 1 to 7, and the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the embodiment further includes a lower air preheater 7 and an upper air preheater 8, and the upper air preheater 8 and the lower air preheater 7 are sequentially installed in the second tail flue 6 from top to bottom. Other components and connections are the same as those in the first embodiment.
The seventh embodiment: the embodiment is described with reference to fig. 1 to 7, and the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the embodiment further includes a first intermediate-temperature superheating screen 29, a second intermediate-temperature superheating screen 30, a first high-temperature superheating screen 32, a second high-temperature superheating screen 34, and a high-temperature reheating screen 40, and the second intermediate-temperature superheating screen 30, the second high-temperature superheating screen 34, the high-temperature reheating screen 40, the first high-temperature superheating screen 32, and the first intermediate-temperature superheating screen 29 are sequentially installed in the furnace 2 from one side to the other side of the furnace 2.
The hearth 2 is formed by enclosing a front membrane type wall 15, two side membrane type walls 16 and a rear membrane type wall 17. Other components and connections are the same as those in the first embodiment.
Principle of operation
Biomass is continuously combusted in the middle of the hearth 2 and exchanges heat with a first medium-temperature overheating screen 29, a second medium-temperature overheating screen 30, a first high-temperature overheating screen 32, a second high-temperature overheating screen 34 and a high-temperature reheating screen 40 which are arranged in the hearth 2, superheated steam passing through the second high-temperature overheating screen 34 is led out of the boiler through a hot steam collecting box 35, reheated steam passing through the heat exchange of the high-temperature reheating screen 40 is led out of the boiler through a reheated steam collecting box 41, soot generated by combustion is discharged from a flue gas outlet at the upper part of a rear film type wall 17 of the hearth 2 and enters a separation material returning system 3, the soot is separated in a separator 3-1, and large-particle-size dust is separated and then returned to the lower part of the hearth 2 through a material returning device 3-2 and continuously combusted in the hearth 2; flue gas enters a first tail flue 4 through an upper outlet of a separator 3-1 and exchanges heat with a heated surface, the flue gas sequentially passes through an evaporation tube bundle 20, a low-temperature reheater 38, a low-temperature superheater 26, a high-temperature economizer 11 and a low-temperature economizer 10 to exchange heat respectively, boiler feed water is fed into the low-temperature economizer 10 through a feed water header 9, the flue gas enters a connecting flue 5 after heat exchange, dust is removed sequentially through a first ash hopper 5-1, a flue 5-2 and a second ash hopper 5-3, the flue gas enters a second tail flue 6 and exchanges heat with the heated surface, the flue gas exchanges heat through a lower air preheater 7 and an upper air preheater 8, and the flue gas is finally discharged through an upper air preheater 8.
The first, second and third cold air exchanges heat through a superior air preheater 8 and a subordinate air preheater 7, and heated primary hot air enters the hearth 2 through the bottom of the hearth 2 to burn biomass; the heated secondary hot air enters the lower part of the hearth 2 through the secondary air devices 1-3, and the heated tertiary hot air enters the middle lower part of the hearth 2 through the tertiary air devices 1-4, so that biomass is intensively combusted and the low NOx combustion is graded.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed with the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment without departing from the technical scope of the present invention, but all the modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principle of the present invention still belong to the protection scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a living beings direct-fired energy-saving circulating fluidized bed high temperature superhigh pressure reheat steam boiler, it includes furnace (2), first afterbody flue (4), connects flue (5) and second afterbody flue (6), its characterized in that: the utility model provides a living beings direct-fired energy-saving circulating fluidized bed high temperature superhigh pressure reheat steam boiler still includes living beings direct-fired system (1) and separation return-stock system (3), the lower part at furnace (2) is installed in living beings direct-fired system (1), the upper portion of furnace (2) is connected with the upper portion of separation return-stock system (3), the lower part of furnace (2) and the sub-unit connection of separation return-stock system (3), the inlet flue of first afterbody flue (4) is connected with the upper portion of separation return-stock system (3), the sub-unit connection of connecting flue (5) and second afterbody flue (6) is passed through to the lower part of first afterbody flue (4).
2. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to claim 1, is characterized in that: the biomass direct-combustion system (1) comprises a biomass direct-combustion feeding device (1-1), a material supplementing device (1-2), a secondary air device (1-3), a tertiary air device (1-4) and a slag discharging device (1-5), wherein the tertiary air device (1-4), the biomass direct-combustion feeding device (1-1), the secondary air device (1-3) and the material supplementing device (1-2) are sequentially arranged on the lower portion of a hearth (2) from top to bottom.
3. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to claim 1, is characterized in that: the separating and returning system (3) is formed by sequentially connecting a separator (3-1) and a returning device (3-2) from top to bottom, a smoke outlet of the hearth (2) is connected with the upper part of the first tail flue (4) through the separator (3-1), and an outlet of the returning device (3-2) is connected with the lower part of the hearth (2).
4. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to claim 1, is characterized in that: the biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler further comprises a low-temperature economizer (10), a high-temperature economizer (11), a low-temperature superheater (26), a low-temperature reheater (38) and a convection bank (20), wherein the convection bank (20), the low-temperature reheater (38), the low-temperature superheater (26), the high-temperature economizer (11) and the low-temperature economizer (10) are sequentially arranged in the first tail flue (4) from top to bottom.
5. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to claim 1, is characterized in that: the connecting flue (5) comprises a first ash bucket (5-1), a flue (5-2) and a second ash bucket (5-3), the first ash bucket (5-1) is installed at the lower part of the first tail flue (4), the second ash bucket (5-3) is installed at the lower part of the second tail flue (6), and the first ash bucket (5-1) is connected with the second ash bucket (5-3) through the flue (5-2).
6. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to claim 1, is characterized in that: the high-temperature ultrahigh-pressure reheating steam boiler of the biomass direct-combustion energy-saving circulating fluidized bed further comprises a lower-level air preheater (7) and an upper-level air preheater (8), wherein the upper-level air preheater (8) and the lower-level air preheater (7) are sequentially installed in the second tail flue (6) from top to bottom.
7. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler according to claim 1, is characterized in that: the biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler further comprises a first medium-temperature overheating screen (29), a second medium-temperature overheating screen (30), a first high-temperature overheating screen (32), a second high-temperature overheating screen (34) and a high-temperature reheating screen (40), wherein the second medium-temperature overheating screen (30), the second high-temperature overheating screen (34), the high-temperature reheating screen (40), the first high-temperature overheating screen (32) and the first medium-temperature overheating screen (29) are sequentially arranged in the hearth (2) from one side to the other side of the hearth (2).
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| CN201921080173.3U CN210153764U (en) | 2019-07-10 | 2019-07-10 | Biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler |
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| CN201921080173.3U CN210153764U (en) | 2019-07-10 | 2019-07-10 | Biomass direct-combustion energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheating steam boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220182A (en) * | 2019-07-10 | 2019-09-10 | 哈尔滨红光锅炉总厂有限责任公司 | A kind of biomass direct-fired energy-saving circulating fluidized bed superhigh-pressure high-temp reheated steam boiler |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220182A (en) * | 2019-07-10 | 2019-09-10 | 哈尔滨红光锅炉总厂有限责任公司 | A kind of biomass direct-fired energy-saving circulating fluidized bed superhigh-pressure high-temp reheated steam boiler |
| CN110220182B (en) * | 2019-07-10 | 2024-04-19 | 哈尔滨红光锅炉总厂有限责任公司 | Biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler |
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