CN110220182B - Biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler - Google Patents
Biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler Download PDFInfo
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- CN110220182B CN110220182B CN201910621950.9A CN201910621950A CN110220182B CN 110220182 B CN110220182 B CN 110220182B CN 201910621950 A CN201910621950 A CN 201910621950A CN 110220182 B CN110220182 B CN 110220182B
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- fluidized bed
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- 239000002028 Biomass Substances 0.000 title claims abstract description 76
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 239000000779 smoke Substances 0.000 claims abstract description 9
- 239000002893 slag Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 28
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 239000010902 straw Substances 0.000 abstract description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000005465 channeling Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/0007—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus with combustion in a fluidized bed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G3/00—Steam superheaters characterised by constructional features; Details of component parts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
- F23C10/24—Devices for removal of material from the bed
- F23C10/26—Devices for removal of material from the bed combined with devices for partial reintroduction of material into the bed, e.g. after separation of agglomerated parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
Abstract
A biomass direct-fired energy-saving type circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler relates to a high-temperature ultrahigh-pressure reheat steam boiler, in particular to a biomass direct-fired energy-saving type circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler. The invention aims to solve the problems of high failure rate of the boiler and difficult biomass formation caused by the difficulty in directly burning yellow straw biomass in the existing biomass circulating fluidized bed boiler, short continuous operation time, low boiler unit efficiency, more pollution discharge, unsmooth feeding and poor reliability. The biomass direct-combustion system is arranged at the lower part of a hearth, the upper part of the hearth is connected with the upper part of a separation and return system, the lower part of the hearth is connected with the lower part of the separation and return system, a smoke inlet of a first tail flue is connected with the upper part of the separation and return system, and the lower part of the first tail flue is connected with the lower part of a second tail flue through a connecting flue. The invention belongs to the field of power generation and cogeneration.
Description
Technical Field
The invention relates to a high-temperature ultrahigh-pressure reheat steam boiler, in particular to a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler, and belongs to the field of power generation and cogeneration.
Background
The existing biomass circulating fluidized bed boiler has the problems of difficult direct combustion of yellow straw biomass, short continuous operation time, low boiler unit efficiency, more pollution emission, unsmooth feeding and poor reliability, and causes higher boiler failure rate.
Disclosure of Invention
The invention aims to solve the problems of high failure rate and difficult biomass formation caused by low efficiency, high pollution emission, unsmooth feeding and poor reliability of a boiler unit of a traditional biomass circulating fluidized bed boiler, which are caused by the fact that the existing biomass circulating fluidized bed boiler directly burns yellow straw biomass, and further provides a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler.
The technical scheme adopted by the invention for solving the problems is as follows: the biomass direct-fired furnace comprises a furnace, a first tail flue, a connecting flue and a second tail flue, and also comprises a biomass direct-fired system and a separation and return system, wherein the biomass direct-fired system is arranged at the lower part of the furnace, the upper part of the furnace is connected with the upper part of the separation and return system, the lower part of the furnace is connected with the lower part of the separation and return system, a smoke inlet of the first tail flue is connected with the upper part of the separation and return system, and the lower part of the first tail flue is connected with the lower part of the second tail flue through the connecting flue.
Further, the biomass direct-combustion system comprises a biomass direct-combustion feeding 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 feeding device are sequentially arranged at the lower part of the hearth from top to bottom.
Further, the separation 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.
Furthermore, the invention also comprises a low-temperature economizer, a high-temperature economizer, a low-temperature superheater, a low-temperature reheater and a convection tube bundle, wherein the convection tube bundle, the low-temperature reheater, the low-temperature superheater, the high-temperature economizer and the low-temperature economizer are sequentially arranged in the first tail flue from top to bottom.
Further, the connecting flue comprises a first ash bucket, a flue and a second ash bucket, wherein the first ash bucket is arranged at the lower part of the first tail flue, the second ash bucket is arranged at the lower part of the second tail flue, and the first ash bucket is connected with the second ash bucket through the flue.
Furthermore, the invention also comprises a lower-stage air preheater and an upper-stage air preheater, wherein the upper-stage air preheater and the lower-stage air preheater are sequentially arranged in the second tail flue from top to bottom.
Furthermore, the invention also comprises a first medium-temperature overheat screen, a second medium-temperature overheat screen, a first high-temperature overheat screen, a second high-temperature overheat screen and a high-temperature reheat screen, wherein the second medium-temperature overheat screen, the second high-temperature overheat screen, the high-temperature reheat screen, the first high-temperature overheat screen and the first medium-temperature overheat screen are sequentially arranged in the hearth from one side to the other side of the hearth.
The beneficial effects of the invention are as follows: the invention is based on realizing the direct combustion of agriculture and forestry biomass fuel with low bed pressure, low bed temperature and low emission, realizes high efficiency, cleanliness and easy adjustment, forms the energy-saving environment-friendly combustion and load stable operation collaborative solution of the biomass direct-fired fluidized bed boiler, and achieves the direct combustion of biomass without briquetting and pelletization; the generation of NOx is inhibited by a low-temperature combustion system combined technology, continuous and stable combustion, low pollutant discharge and easy temperature regulation of a boiler unit are finally realized, and the problems of energy waste and environmental pollution caused by the existing biomass combustion are solved; the invention directly burns the yellow stalk biomass by the circulating fluidized bed boiler, realizes the cooperation and combination of high-efficiency environment-friendly continuous stable operation, realizes the cooperation of energy-saving environment-friendly direct-fired biomass, clean and high-efficiency combustion and steam-water circulation temperature regulation;
The biomass used by the invention is not pressed into blocks or granulated, and is directly fed and combusted by a screw feeder, so that effective sealing is realized, the reverse channeling of smoke is effectively prevented, and the problems of a large number of 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 unsmooth feeding is effectively prevented; the invention solves the problem of high NOx emission of the existing biomass boiler, solves the problems of generating and controlling combustion NOx in the boiler, and forms a low NOx biomass combustion and control technology; a large number of heating surfaces such as superheaters, reheaters and the like are arranged in a hearth, and a low-temperature combustion technology is adopted, so that the temperature of an outlet of the hearth is controlled to be within 800 ℃, and the generation of NOx is reduced; the primary air, the secondary air and the tertiary air are graded and adjustable for supplying air to form anoxic combustion, so that the generation of NOx can be obviously inhibited; the invention solves the problems of low parameters and low unit efficiency of the traditional biomass boiler, mainly promotes the parameters of the boiler and optimizes the system integration, overcomes the difficulties of heat transfer, temperature adjustment and the like of the boiler, and completes the integral arrangement scheme of the boiler and the integrated optimization of the steam-water system; the main steam pressure of the boiler is 13.7MPa, the temperature of the superheated steam and the reheat steam is 540 ℃, and the efficiency of a boiler unit is improved and the biomass consumption is reduced by the application of a high-temperature ultrahigh-pressure one-time reheat technology; the low-temperature superheater and the low-temperature reheater are arranged in the tail flue, the medium-temperature overheat screen, the high-temperature overheat screen and the high-temperature reheat screen are arranged in the hearth, the heat transfer problem of the high-efficiency boiler is solved, and the double-flue design of the boiler is reasonable in overall arrangement; the superheated steam adopts three-stage temperature reduction, the reheat steam adopts two-stage temperature reduction, the temperature adjustment is convenient, the safety and the reliability are realized, and the integration optimization of a steam system is realized; the biomass used by the invention is not pressed and granulated, and solves the problems of more faults, poor reliability, high power consumption and the like of a biomass material preparation device. The spiral feeder is used for directly feeding, so that effective sealing is realized, reverse channeling of smoke is effectively prevented, and the problems of multiple faults, poor reliability and the like of a feeding system are solved; the circulating fluidized bed boiler has good self-ash-cleaning property and can prevent slag formation on the heating surface of the water-cooled wall. The 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 the upper part of the furnace by flue gas in the combustion process, are separated from the flue gas through a separator arranged at the outlet of the furnace, and are returned into the bed through a return valve for multiple circulating combustion. The boiler has high adaptability to the types of biomass fuels due to high material concentration, large heat capacity and good material mixing; the invention reasonably distributes the proportion of the primary air, the secondary air and the tertiary air, adjusts the combustion share in the furnace, inhibits the generation of NOx and adapts to the characteristic of large fluctuation of biomass water; when the flue gas passes through the connecting flue, dust is removed and discharged through the ash bucket, the flue and the ash bucket in a multistage separation mode, and 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 cross-sectional view taken along line C-C of FIG. 1;
FIG. 3 is a schematic structural view of a biomass direct combustion system;
FIG. 4 is a sectional view taken along the direction D-D in FIG. 3;
FIG. 5 is a schematic view of the structure within the furnace;
FIG. 6 is a sectional view in the G-G direction and J-J direction 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: referring to fig. 1 to 7, the embodiment is described as a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler, which comprises a furnace 2, a first tail flue 4, a connecting flue 5 and a second tail flue 6, the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler further comprises a biomass direct-fired system 1 and a separation return system 3, the biomass direct-fired system 1 is installed at the lower part of the furnace 2, the upper part of the furnace 2 is connected with the upper part of the separation return system 3, the lower part of the furnace 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: referring to fig. 1 to 7, a biomass direct-fired system 1 of a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the present embodiment includes a biomass direct-fired feeding device 1-1, a feeding 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-fired feeding device 1-1, the secondary air device 1-3, and the feeding device 1-2 are sequentially installed at the lower part of a furnace 2 from top to bottom.
Biomass enters the lower part of the hearth 2 through the biomass direct-combustion feeding device 1-1 for combustion, bed materials enter the lower part of the hearth 2 through the feeding device 1-2 for fluidization, the biomass direct-combustion feeding device 1-1 and the feeding device 1-2 are welded with the lower part of the front membrane wall 15 of the hearth 2, and the biomass ash after combustion is discharged through the 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 and fluidizes the bed material; the secondary air enters the lower part of the hearth 2 through the secondary air device 1-3 to burn and support the combustion of biomass; and tertiary air enters the middle lower part of the hearth 2 through the tertiary air device 1-4 to burn out biomass, and the oxygen-deficient low-nitrogen combustion is realized by adjusting air distribution in a grading manner.
Other components and connection relationships are the same as those of the first embodiment.
And a third specific embodiment: referring to fig. 1 to 7, a description is given of the present embodiment, in which a separation and return system 3 of a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the present embodiment is formed by sequentially connecting a separator 3-1 and a return 3-2 from top to bottom, a smoke outlet of a furnace 2 is connected with an upper portion of a first tail flue 4 through the separator 3-1, and an outlet of the return 3-2 is connected with a lower portion of the furnace 2. Other components and connection relationships are the same as those of the first embodiment.
The specific embodiment IV is as follows: the description of the present embodiment with reference to fig. 1 to 7 is that 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, 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 installed in the first back flue 4 from top to bottom. Other components and connection relationships are the same as those of the first embodiment.
Fifth embodiment: referring to fig. 1 to 7, a connecting flue 5 of a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler according to the present embodiment includes a first ash bucket 5-1, a flue 5-2 and a second ash bucket 5-3, wherein the first ash bucket 5-1 is mounted at the lower part of a first tail flue 4, the second ash bucket 5-3 is mounted 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 connection relationships are the same as those of the first embodiment.
Specific embodiment six: referring to fig. 1 to 7, the embodiment of the present invention is described with reference to a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultra-high pressure reheat steam boiler, which further includes a lower air preheater 7 and an upper air preheater 8, wherein 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 connection relationships are the same as those of the first embodiment.
Seventh embodiment: referring to fig. 1 to 7, the embodiment of the present invention is described with reference to a biomass direct-fired energy-saving circulating fluidized bed high-temperature ultra-high pressure reheat steam boiler, which 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 reheat screen 40, wherein the second intermediate-temperature superheating screen 30, the second high-temperature superheating screen 34, the high-temperature reheat 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 wall 15, two side membrane walls 16 and a rear membrane wall 17. Other components and connection relationships are the same as those of the first embodiment.
Principle of operation
The biomass continues to burn in the middle of the hearth 2, exchanges heat with a first medium-temperature overheat screen 29, a second medium-temperature overheat screen 30, a first high-temperature overheat screen 32, a second high-temperature overheat screen 34 and a high-temperature reheat screen 40 which are arranged in the hearth 2, the superheated steam passing through the second high-temperature overheat screen 34 is led out of a boiler through a hot steam collecting box 35, the reheat steam exchanging heat through the high-temperature reheat screen 40 is led out of the boiler through a reheat steam collecting box 41, soot generated by burning is discharged from a flue gas outlet at the upper part of a rear membrane wall 17 of the hearth 2, enters a separation and returning system 3, soot is separated in a separator 3-1, and large-particle-size dust is returned to the lower part of the hearth 2 after being separated and is continuously burned in the hearth 2; the flue gas enters the first tail flue 4 through the upper outlet of the separator 3-1 to exchange heat with a heating surface, the flue gas sequentially flows through the evaporation tube bundle 20, the low-temperature reheater 38, the low-temperature superheater 26, the high-temperature economizer 11 and the low-temperature economizer 10 to exchange heat respectively, boiler feed water is fed into the low-temperature economizer 10 through the feed water header 9, the flue gas enters the connecting flue 5 after heat exchange and sequentially removes dust through the first ash bucket 5-1, the flue 5-2 and the second ash bucket 5-3 and then enters the second tail flue 6 to exchange heat with the heating surface, the flue gas is finally discharged through the upper air preheater 8 after heat exchange through the lower air preheater 7 and the upper air preheater 8.
1. The secondary and tertiary cold air exchanges heat through the upper-level air preheater 8 and the lower-level air preheater 7, and the 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 device 1-3, and the heated tertiary hot air enters the middle lower part of the hearth 2 through the tertiary air device 1-4, so that the biomass is burned in an intensified manner and the low NOx combustion is graded.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (5)
1. A biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler comprises a hearth (2), a first tail flue (4), a connecting flue (5) and a second tail flue (6); the method is characterized in that: the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler further comprises a biomass direct-fired system (1), a separation and returning system (3), a low-temperature superheater (26), a first medium-temperature superheat screen (29), a second medium-temperature superheat screen (30), a first high-temperature superheat screen (32), a second high-temperature superheat screen (34), a low-temperature reheater (38) and a high-temperature reheat screen (40), wherein the biomass direct-fired system (1) is arranged at the lower part of a hearth (2), the upper part of the hearth (2) is connected with the upper part of the separation and returning system (3), the lower part of the hearth (2) is connected with the lower part of the separation returning charge system (3), the smoke inlet of the first tail flue (4) is connected with the upper part of the separation returning charge system (3), 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 biomass direct-fired system (1) comprises a biomass direct-fired feeding device (1-1), a feeding device (1-2), a secondary air device (1-3), a tertiary air device (1-4) and a slag discharging device (1-5), and the tertiary air device (1-4), the biomass direct-fired feeding device (1-1), the secondary air device (1-3), the feeding device (1-2) is sequentially arranged at the lower part of the hearth (2) from top to bottom, the biomass direct-fired feeding device (1-1) is arranged at a negative pressure point at the lower part of the hearth, the second medium-temperature overheat screen (30), the second high-temperature overheat screen (34), the high-temperature reheat screen (40), the first high-temperature overheat screen (32) and the first medium-temperature overheat screen (29) are sequentially arranged in the hearth (2) from one side to the other side of the hearth (2), and the low-temperature reheater (38) and the low-temperature superheater (26) are sequentially arranged in the first tail flue (4) from top to bottom.
2. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler as set forth in claim 1, wherein: 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).
3. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler as set forth in claim 1, wherein: the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler further comprises a low-temperature economizer (10), a high-temperature economizer (11) and a convection tube bundle (20), wherein the convection tube bundle (20), the high-temperature economizer (11) and the low-temperature economizer (10) are sequentially arranged in the first tail flue (4) from top to bottom.
4. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler as set forth in claim 1, wherein: the connecting flue (5) comprises a first ash bucket (5-1), a flue (5-2) and a second ash bucket (5-3), wherein the first ash bucket (5-1) is arranged at the lower part of the first tail flue (4), the second ash bucket (5-3) is arranged 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).
5. The biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler as set forth in claim 1, wherein: the biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler further comprises a lower-stage air preheater (7) and an upper-stage air preheater (8), wherein the upper-stage air preheater (8) and the lower-stage air preheater (7) are sequentially arranged in the second tail flue (6) from top to bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910621950.9A CN110220182B (en) | 2019-07-10 | 2019-07-10 | Biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler |
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| CN201910621950.9A CN110220182B (en) | 2019-07-10 | 2019-07-10 | Biomass direct-fired energy-saving circulating fluidized bed high-temperature ultrahigh-pressure reheat steam boiler |
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| CN110220182B true CN110220182B (en) | 2024-04-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110793013A (en) * | 2019-12-16 | 2020-02-14 | 哈尔滨红光锅炉总厂有限责任公司 | High-temperature and high-pressure steam boiler of pure-burning biomass environment-friendly circulating fluidized bed |
| CN111795379A (en) * | 2020-08-07 | 2020-10-20 | 无锡华光环保能源集团股份有限公司 | Circulating fluidized bed boiler for burning biomass |
| CN112856365A (en) * | 2021-01-11 | 2021-05-28 | 北京德普新源生态技术有限公司 | Biomass direct-fired water-cooling vibrating grate high-temperature ultrahigh-pressure reheating boiler |
| CN114135893B (en) * | 2021-10-25 | 2024-04-12 | 国家能源集团国源电力有限公司 | Material returning device and boiler |
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