CN211084042U - Pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system - Google Patents
Pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system Download PDFInfo
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- CN211084042U CN211084042U CN201922259831.1U CN201922259831U CN211084042U CN 211084042 U CN211084042 U CN 211084042U CN 201922259831 U CN201922259831 U CN 201922259831U CN 211084042 U CN211084042 U CN 211084042U
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Abstract
A pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system relates to a boiler water vapor system. The utility model provides a current boiler steam system integrate with boiler combustion system and hang down, be not convenient for boiler temperature regulation and load adjustment, lead to the pure burning biomass of boiler problem difficult, unit operating efficiency hangs down. The economizer is connected with the boiler barrel through a feed water distribution pipe, a water screen descending pipe is communicated with the water screen, the water screen is communicated with the boiler barrel through a water screen eduction pipe, one end of a saturated steam eduction pipe is communicated with the boiler barrel, the other end of the saturated steam eduction pipe is connected with a side wrapping wall superheater, a front wrapping wall superheater and a rear wrapping wall superheater, a low-temperature superheater is connected with a medium-temperature superheater through a first-stage water spray desuperheater, the medium-temperature superheater is connected with the medium-temperature screen superheater through a second-stage water spray desuperheater, and the medium-temperature screen superheater is connected with a high-temperature screen superheater through a third-. The utility model is used for on pure burning living beings environment-friendly circulating fluidized bed boiler.
Description
Technical Field
The utility model relates to a boiler steam system, concretely relates to pure burning living beings environment-friendly circulating fluidized bed boiler steam system.
Background
According to the requirement of the national instruction for promoting the development of biomass energy heat supply and the development of local area coal limitation and coal prohibition work in China, the development of the biomass circulating fluidized bed boiler is accelerated, and clean combustion, low pollution emission and stable load operation are required to be achieved. The outdoor incineration and stacking corrosion of the agriculture and forestry biomass can cause the damage of haze, fire and the like to the environment and the pollution to natural resources.
With the increasing strictness and perfection of environmental protection and energy conservation, the circulating fluidized bed combustion technology is rapidly developed due to the environmental protection performance, and the development and application of an environment-friendly and energy-saving biomass circulating fluidized bed boiler are promoted.
At present, the existing pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system and a boiler burning system are low in integration, inconvenient for temperature regulation and load adjustment, and cause that the pure-burning biomass of the boiler is difficult and the unit operation efficiency is low.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a system that solves current boiler steam system and boiler burning integrates lowly, the boiler temperature regulation and the load adjustment of being not convenient for, leads to the problem that the pure burning biomass of boiler is difficult, unit operating efficiency is low, and then provides a pure burning living beings environment-friendly circulating fluidized bed boiler steam system.
The utility model discloses a solve the technical scheme that above-mentioned technical problem took and be:
the utility model discloses a pure burning living beings environment-friendly circulating fluidized bed boiler steam system includes feed water header 9, economizer 10, drum 12, centralized downcomer 13, water screen 15, preceding water wall 17, side water wall 18, back water wall 19, water-cooling steam guide pipe 20, saturated steam eduction tube 21, side package wall superheater 22, preceding package wall superheater 23, back package wall superheater 24, low temperature superheater 25, first-order water spray desuperheater 26, medium temperature superheater 27 in the furnace, second grade water spray desuperheater 28, medium temperature screen superheater 29, tertiary water spray desuperheater 30, high temperature screen superheater 31, steam collection box 32 and feed water distributing pipe 11;
the water supply header 9 and the economizer 10 are communicated with each other, the water supply header 9 is positioned below the economizer 10, the boiler barrel 12 is positioned at the top of the hearth, the economizer 10 is connected with the boiler barrel 12 through a water supply distribution pipe 11, the centralized downcomer 13 is arranged at the front part of the hearth 4, the upper part of the centralized downcomer 13 is connected with the boiler barrel 12, the lower part of the centralized downcomer 13 is respectively communicated with the front water-cooled wall 17, the side water-cooled wall 18 and the rear water-cooled wall 19, the water-cooled steam guide pipe 20 is positioned at the top of the hearth 4, and the hearth 4 is connected with the boiler barrel 12 through the water-cooled steam guide pipe 20; the lower part of the boiler barrel 12 is provided with a water screen downcomer 14, the water screen downcomer 14 is communicated with a water screen 15, the water screen 15 is communicated with the boiler barrel 12 through a water screen eduction tube 16, one end of a saturated steam eduction tube 21 is communicated with the boiler barrel 12, the other end of the saturated steam eduction tube 21 is connected with a side wrapping wall superheater 22, a front wrapping wall superheater 23 and a rear wrapping wall superheater 24, a low-temperature superheater 25 is positioned below the wrapping wall superheater and is communicated with the wrapping wall superheater, the low-temperature superheater 25 is connected with a primary water spray desuperheater 26, the primary water spray desuperheater 26 is connected with a medium-temperature superheater 27, the medium-temperature superheater 27 is connected with a medium-temperature screen superheater 29 through a secondary water spray desuperheater 28, the medium-temperature screen superheater 29 is connected with a high-temperature screen superheater 31 through a tertiary water spray desuperheater 30, and the upper end.
In one embodiment, the furnace 4 is enclosed by a front water wall 17, a side water wall 18, and a rear water wall 19.
In one embodiment, the side wall superheater 22, the front wall superheater 23, and the rear wall superheater 24 constitute wall superheater, which is located in the back pass of the boiler.
In one embodiment, the economizer 10 is composed of a low-temperature economizer and a high-temperature economizer, the low-temperature economizer is connected with the high-temperature economizer, and the high-temperature economizer, the low-temperature economizer and the water supply header 9 are sequentially arranged in the tail flue from top to bottom and are positioned below the wall-wrapping superheater.
In one embodiment, the water screen 15, the middle-temperature screen superheater 29 and the high-temperature screen superheater 31 are arranged side by side in the furnace chamber 4, and the middle-temperature screen superheater 29 is communicated with the high-temperature screen superheater 31 through a three-stage water spray desuperheater 30.
The utility model has the advantages that:
the pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system of the utility model solves the problems of low parameters and low unit efficiency of the prior biomass boiler by integrating and optimizing the boiler water vapor system, mainly promotes the boiler parameters and optimizes the system integration, overcomes the difficulties of heat transfer, temperature regulation, fuel diversity and load regulation of the boiler, and realizes the integral arrangement of the heating surface of the boiler and the integration and optimization of a steam-water flow system; the pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system of the utility model arranges the low-temperature superheater and the medium-temperature superheater in the wall-covered superheater, and arranges the water-cooling screen, the medium-temperature screen superheater and the high-temperature screen superheater in the furnace chamber, thereby overcoming the high-efficiency heat transfer problem of the boiler, solving the problems of high-temperature slagging and corrosion, and leading the water vapor flow system to be more reasonable, so that the whole arrangement of the boiler and the flow of the water vapor system are optimized in a coordinated manner;
the superheated steam of the pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system adopts three-level water spraying temperature reduction, thereby facilitating the regulation of fuel, load and temperature and realizing the integration and optimization of boiler combustion and a water vapor flow system;
the utility model discloses a pure burning heating surfaces such as a large amount of water-cooling screens, over heater and re-heater of arranging in living beings environment-friendly circulating fluidized bed boiler steam system furnace adopt the low temperature combustion technique, make furnace outlet temperature control within 800 ℃, reduce NOx and generate, avoid high temperature corrosion.
Drawings
FIG. 1 is a schematic flow diagram of a water vapor system of a pure biomass burning environment-friendly circulating fluidized bed boiler of the present invention;
FIG. 2 is a main sectional view of the biomass-fired environmental-friendly circulating fluidized bed boiler of the present invention;
fig. 3 is a sectional view of the environment-friendly circulating fluidized bed boiler with pure biomass combustion according to the present invention (the left half is a left sectional view from a to a in fig. 2, and the right half is a right half sectional view from B to B in fig. 2);
FIG. 4 is a top view of the pure biomass burning environment friendly circulating fluidized bed boiler of the present invention (the upper half is a cross-sectional view C-C of FIG. 2, and the lower half is a cross-sectional view D-D of FIG. 2);
FIG. 5 is a schematic structural view of a hearth 4 of the biomass-fired environment-friendly circulating fluidized bed boiler of the present invention;
fig. 6 is a top cross-sectional view of the furnace 4 of the biomass-fired environment-friendly circulating fluidized bed boiler of the present invention (the upper half is a G-G cross-sectional view of fig. 5, and the lower half is a J-J cross-sectional view of fig. 5);
fig. 7 is a main sectional view of the wall-wrapped superheater 6 of the environment-friendly circulating fluidized bed boiler for pure biomass burning of the utility model.
In the figure: the single arrows indicate water flow and the double arrows indicate steam flow;
4 is a hearth, 5 is a separation material returning system, 6 is a wall-wrapping superheater, 7 is an air preheater, 9 is a water supply header, 10 is an economizer, 11 is a water supply distribution pipe, 12 is a drum, 13 is a centralized downcomer, 14 is a water screen downcomer, 15 is a water screen, 16 is a water screen eduction pipe, 17 is a front water wall, 18 is a side water cooling wall, 19 is a rear water cooling wall, 20 is a water cooling steam guide pipe, 21 is a saturated steam eduction pipe, 22 is a side-wrapping superheater, 23 is a front wall-wrapping superheater, 24 is a rear wall-wrapping superheater, 25 is a low-temperature superheater, 26 is a primary water spraying desuperheater, 27 is a medium-temperature superheater, 28 is a secondary water spraying desuperheater, 29 is a medium-temperature screen superheater, 30 is a tertiary water spraying desuperheater, 31 is a high-temperature superheater and 32 is a steam collection header.
Detailed Description
The first embodiment is as follows: as shown in fig. 1 to 7, the pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system of the present embodiment includes a water supply header 9, an economizer 10, a drum 12, a centralized downcomer 13, a water screen 15, a front water wall 17, a side water wall 18, a rear water wall 19, a water-cooled steam guide pipe 20, a saturated steam outlet pipe 21, a side wall superheater 22, a front wall superheater 23, a rear wall superheater 24, a low temperature superheater 25, a primary water spray desuperheater 26, a middle temperature superheater 27 in a furnace, a secondary water spray desuperheater 28, a middle temperature screen superheater 29, a tertiary water spray desuperheater 30, a high temperature screen superheater 31, a steam collection header 32, and a water supply distribution pipe 11;
the water supply header 9 and the economizer 10 are communicated with each other, the water supply header 9 is positioned below the economizer 10, the boiler barrel 12 is positioned at the top of the hearth, the economizer 10 is connected with the boiler barrel 12 through a water supply distribution pipe 11, the centralized downcomer 13 is arranged at the front part of the hearth 4, the upper part of the centralized downcomer 13 is connected with the boiler barrel 12, the lower part of the centralized downcomer 13 is respectively communicated with the front water-cooled wall 17, the side water-cooled wall 18 and the rear water-cooled wall 19, the water-cooled steam guide pipe 20 is positioned at the top of the hearth 4, and the hearth 4 is connected with the boiler barrel 12 through the water-cooled steam guide pipe 20; the lower part of the boiler barrel 12 is provided with a water screen downcomer 14, the water screen downcomer 14 is communicated with a water screen 15, the water screen 15 is communicated with the boiler barrel 12 through a water screen eduction tube 16, one end of a saturated steam eduction tube 21 is communicated with the boiler barrel 12, the other end of the saturated steam eduction tube 21 is connected with a side wrapping wall superheater 22, a front wrapping wall superheater 23 and a rear wrapping wall superheater 24, a low-temperature superheater 25 is positioned below the wrapping wall superheater and is communicated with the wrapping wall superheater, the low-temperature superheater 25 is connected with a primary water spray desuperheater 26, the primary water spray desuperheater 26 is connected with a medium-temperature superheater 27, the medium-temperature superheater 27 is connected with a medium-temperature screen superheater 29 through a secondary water spray desuperheater 28, the medium-temperature screen superheater 29 is connected with a high-temperature screen superheater 31 through a tertiary water spray desuperheater 30, and the upper end.
If the biomass fuel of the utility model adopts agriculture and forestry biomass dispersed fuel, the length of the biomass fuel is controlled within 100 mm; if the agriculture and forestry biomass briquette fuel is adopted, the briquette fuel can be compressed into a block shape or a columnar shape and the like, and the length is controlled within 50 mm;
the cross restriction is adopted when the air quantity and the biomass fuel are regulated and combusted, and when the load of the boiler is increased, air is added firstly and then the fuel is added; when the load is reduced, the fuel is reduced firstly and then the air is reduced, so that the fuel-rich working condition in the hearth can be avoided when the load of the boiler is changed, the reducing atmosphere in the hearth can be avoided, and the generation of nitrogen oxides can be effectively prevented;
compared with the traditional oil ignition, the ignition by adopting clean natural gas has superior environmental protection performance, and avoids oil contamination and black oil smoke pollution to a heating surface caused by incomplete ignition and combustion of traditional diesel oil;
the natural gas ignition is adopted, and the bag-type dust remover does not need to be disconnected when the boiler is started, so that the pollution and blockage of the oil ignition to the bag are avoided, and the dust emission in the initial ignition stage is ensured to meet the requirement;
the utility model fully considers the factors of biomass fuel diversity, boiler load change and the like, arranges enough heating surfaces in the hearth for heat exchange, and prolongs the stay and burning time of the fuel in the hearth by improving the height of the hearth; a large number of heating surfaces such as a water-cooling screen 15, a medium-temperature screen superheater 29, a high-temperature screen superheater 31 and the like are arranged at the upper part of the hearth, so that the temperature of the outlet of the hearth is reduced and maintained at about 800 ℃, coking can be effectively prevented, and sufficient combustion is ensured;
the high-temperature screen superheater 31 is made of TP347H material with corrosion resistance and high-temperature plasticity, the high-temperature screen superheater is arranged in the hearth, and due to the adherence and backflow effects of circulating materials, no ash is deposited and slag is formed on the surface of the superheater, so that high-temperature corrosion under ash is effectively prevented, and deformation and efficient heat exchange of the high-temperature screen superheater are guaranteed;
by adopting the wall-wrapped superheater 6 structure, the heating surface is effectively increased, the sealing and heat insulation effects are better, the heat dissipation and air leakage are reduced, and the boiler efficiency is improved;
the low-temperature superheater 25 and the medium-temperature superheater 27 are arranged in the wall-wrapped superheater 6, so that the arrangement space can be saved, and the hoisting and connection of the wall-wrapped superheater are facilitated;
the second embodiment is as follows: as shown in fig. 1 and 2, the furnace 4 of the present embodiment is surrounded by a front water wall 17, a side water wall 18, and a rear water wall 19.
By the design, the front water-cooled wall 17, the side water-cooled wall 18 and the rear water-cooled wall 19 are arranged in the hearth, and the low-temperature combustion technology is adopted, so that the temperature of the hearth outlet is controlled within 800 ℃, and the generation of NOx is reduced. Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: as shown in fig. 1 and 7, the side-wall-enveloping superheater 22, the front-wall-enveloping superheater 23, and the rear-wall-enveloping superheater 24 of the present embodiment constitute a wall-enveloping superheater, and the wall-enveloping superheater is located in the boiler back flue.
By the design, the heating surface is effectively increased, good sealing and heat insulation effects are achieved, heat dissipation and air leakage are reduced, and boiler efficiency is improved. Other components and connection relationships are the same as those in the first or second embodiment.
The fourth concrete implementation mode: as shown in fig. 1, 2, 4, and 7, the economizer 10 of the present embodiment is composed of a low-temperature economizer and a high-temperature economizer, the low-temperature economizer is connected to the high-temperature economizer, and the high-temperature economizer, the low-temperature economizer, and the water supply header tank 9 are sequentially disposed in the tail flue from top to bottom and located below the wall-wrapped superheater.
By the design, soot blowing and ash removal are facilitated, pitch between the tubes is controlled, and the self-ash-removing capacity is enhanced under the condition that abrasion is not caused. Other components and connection relationships are the same as those in the third embodiment.
The fifth concrete implementation mode: as shown in fig. 1 to 6, in the present embodiment, the water screen 15, the middle-temperature screen superheater 29, and the high-temperature screen superheater 31 are installed side by side in the furnace chamber 4, and the middle-temperature screen superheater 29 is communicated with the high-temperature screen superheater 31 through the three-stage water spray desuperheater 30.
By the design, the arrangement space can be saved, and the lifting and the connection of the device are facilitated. The other components and the connection relations are the same as those of the first, second or fourth embodiment.
The working process is as follows:
boiler feed water enters an economizer 10 through a feed water header 9 and enters a drum 12 through a feed water distribution pipe 11, one path of water enters a front water-cooled wall 17, a side water-cooled wall 18 and a rear water-cooled wall 19 through a centralized downcomer 13 arranged at the lower part of the drum 12, and a water-steam mixture enters the drum 12 through a water-cooled steam guide pipe 20; one path of water enters a water screen 15 through a water screen descending pipe 14 arranged at the lower part of a boiler barrel 12, a water-vapor mixture enters the boiler barrel 12 through a water screen leading-out pipe 16, the two paths of water-vapor mixture are subjected to water-vapor separation in the boiler barrel 12, steam is led out through a saturated steam leading-out pipe 21, sequentially flows through a side wall-wrapping superheater 22, a front wall-wrapping superheater 23 and a rear wall-wrapping superheater 24, then enters a first-stage water spraying desuperheater 26 for desuperheating after passing through a low-temperature superheater 25, sequentially enters a wall-wrapping medium-temperature superheater 27 after desuperheating, then is desuperheater through a second-stage water spraying desuperheater 28, is heated by a furnace chamber medium-temperature screen superheater 29 after desuperheating, then enters a furnace chamber high-temperature screen superheater 31 for heating after being desuperheater by.
Claims (5)
1. A pure-biomass-fired environment-friendly circulating fluidized bed boiler water vapor system comprises a water supply header (9), an economizer (10), a drum (12), a centralized downcomer (13), a water screen (15), a front water wall (17), a side water wall (18), a rear water wall (19), a water-cooled steam guide pipe (20), a saturated steam outlet pipe (21), a side wrapping wall superheater (22), a front wrapping wall superheater (23), a rear wrapping wall superheater (24), a low-temperature superheater (25), a primary water spray attemperator (26), a middle-temperature superheater (27) in a hearth, a secondary water spray attemperator (28), a middle-temperature screening superheater (29), a tertiary water spray attemperator (30), a high-temperature screening superheater (31), a steam collection tank (32) and a water supply distribution pipe (11);
the method is characterized in that: the water supply collecting tank (9) is communicated with the economizer (10), the water supply collecting tank (9) is positioned below the economizer (10), the boiler barrel (12) is positioned at the top of the hearth, the economizer (10) is connected with the boiler barrel (12) through a water supply distribution pipe (11), the centralized downcomer (13) is arranged at the front part of the hearth (4), the upper part of the centralized downcomer (13) is connected with the boiler barrel (12), the lower part of the centralized downcomer (13) is respectively communicated with the front water-cooled wall (17), the side water-cooled wall (18) and the rear water-cooled wall (19), the water-cooled steam guide pipe (20) is positioned at the top of the hearth (4), and the hearth (4) is connected with the boiler barrel (12) through the water-cooled steam guide pipe (20); a water screen downcomer (14) is arranged at the lower part of the boiler barrel (12), the water screen downcomer (14) is communicated with a water screen (15), the water screen (15) is communicated with the boiler barrel (12) through a water screen eduction tube (16), one end of a saturated steam eduction tube (21) is communicated with the boiler barrel (12), the other end of the saturated steam eduction tube (21) is connected with a side wrapping wall superheater (22), a front wrapping wall superheater (23) and a rear wrapping wall superheater (24), a low-temperature superheater (25) is positioned below the wrapping wall superheater and communicated with the wrapping wall superheater, a first-stage water spraying desuperheater (26) is connected with a medium-temperature superheater (27), the medium-temperature superheater (27) is connected with a medium-temperature screen superheater (29) through a second-stage water spraying desuperheater (28), the medium-temperature screen superheater (29) is connected with a high-temperature screen superheater (31) through a third-stage water spraying desuperheater (30), the upper end of the high-temperature screen superheater (31) is communicated with a steam collection box (32).
2. The pure biomass fired environment friendly circulating fluidized bed boiler water vapor system of claim 1, wherein: the hearth (4) is enclosed by a front water-cooling wall (17), a side water-cooling wall (18) and a rear water-cooling wall (19).
3. The pure-biomass-fired environment-friendly circulating fluidized bed boiler water vapor system according to claim 1 or 2, characterized in that: the side-wrapped wall superheater (22), the front wrapped wall superheater (23) and the rear wrapped wall superheater (24) form a wrapped wall superheater, and the wrapped wall superheater is positioned in a flue at the tail part of the boiler.
4. The pure biomass fired environment friendly circulating fluidized bed boiler steam system of claim 3, wherein: the economizer (10) consists of a low-temperature economizer and a high-temperature economizer, the low-temperature economizer is connected with the high-temperature economizer, and the high-temperature economizer, the low-temperature economizer and the water supply header (9) are sequentially arranged in the tail flue from top to bottom and are positioned below the wall-wrapping superheater.
5. The pure biomass fired environmentally friendly circulating fluidized bed boiler steam system of claim 1, 2 or 4, wherein: the water cooling screen (15), the middle temperature screen superheater (29) and the high temperature screen superheater (31) are arranged in the hearth (4) side by side, and the middle temperature screen superheater (29) is communicated with the high temperature screen superheater (31) through a three-level water spraying desuperheater (30).
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| CN201922259831.1U CN211084042U (en) | 2019-12-16 | 2019-12-16 | Pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system |
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| CN201922259831.1U CN211084042U (en) | 2019-12-16 | 2019-12-16 | Pure-burning biomass environment-friendly circulating fluidized bed boiler water vapor system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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