CN105953220A - Separator outlet flue and multi-flow circulating fluidized bed hot water boiler - Google Patents
Separator outlet flue and multi-flow circulating fluidized bed hot water boiler Download PDFInfo
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- CN105953220A CN105953220A CN201610304612.9A CN201610304612A CN105953220A CN 105953220 A CN105953220 A CN 105953220A CN 201610304612 A CN201610304612 A CN 201610304612A CN 105953220 A CN105953220 A CN 105953220A
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- membrane
- flue
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 201
- 239000012528 membrane Substances 0.000 claims abstract description 167
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 35
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 22
- 239000003546 flue gas Substances 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 21
- 239000011490 mineral wool Substances 0.000 claims description 17
- 238000009413 insulation Methods 0.000 claims description 15
- 230000001681 protective effect Effects 0.000 claims description 15
- 239000011449 brick Substances 0.000 claims description 10
- 238000004321 preservation Methods 0.000 claims description 10
- 229910052593 corundum Inorganic materials 0.000 claims description 6
- 239000010431 corundum Substances 0.000 claims description 6
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 8
- 238000009434 installation Methods 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000005266 casting Methods 0.000 description 5
- 206010022000 influenza Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Classifications
-
- 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
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention relates to a separator outlet flue and a multi-flow circulating fluidized bed hot water boiler. A membrane wall assembly comprises a water inlet header, a membrane wall structure, membrane wall suspenders, a water outlet header and header suspenders. Water in the water inlet header flows through a membrane wall and then flows to the water outlet header. Water in the water outlet header is collected to an external water cooling system. The membrane wall suspenders are used for hanging the membrane wall onto a boiler steel frame. The header suspenders are used for hanging the water inlet header and the water outlet header onto the boiler steel frame. According to the separator outlet flue and the multi-flow circulating fluidized bed hot water boiler, the material cost can be lowered, a pouring or constructing link for a flue body is omitted, and the installation period is shortened; and as an auxiliary heated face of the boiler, the separator outlet flue can also absorb radiant heat of high-temperature smoke in the flue, and therefore the boiler heat efficiency is improved.
Description
Technical Field
The invention relates to the technical field of boiler structures, in particular to a separator outlet flue and a multi-flow circulating fluidized bed hot water boiler.
Background
The structure of the existing multi-flow circulating fluidized bed hot water boiler is shown in fig. 1, and comprises a main combustion chamber 1, an auxiliary combustion chamber 2 and a burnout chamber 3 which are arranged in parallel with the main combustion chamber 1, and a cyclone separator 4, a separator outlet flue 5, a tail flue and a tail heating surface 6 which are sequentially arranged in the subsequent flow of the burnout chamber 3 according to the flow direction of flue gas, wherein the tail flue and the tail heating surface 6 are provided with coal economizers. The flue gas from the burnout chamber 3 is treated by the cyclone separator 4, and the temperature of the flue gas entering the outlet flue 5 of the separator through the central cylinder is higher, generally more than 500 ℃. For economy and safety, the outer surface temperature of the outermost insulation layer of the separator outlet flue 5 should be within the allowable range of the relevant standards, and therefore the design of the separator outlet flue 5 is a non-negligible part of the multi-pass circulating fluidized bed hot water boiler.
In order to ensure that the outer surface temperature of the outermost heat insulating layer of the separator outlet flue 5 is within the range allowed by the relevant standards, the separator outlet flue 5 of the existing circulating fluidized bed hot water boiler mainly takes the following three forms:
the first separator outlet flue 5 is constructed as shown in fig. 2, and is composed of a furnace wall 5-1 formed by pouring refractory castable and heat-insulating castable on a guard plate, a roof structure 5-2 and a flue gas guide slope 5-3. The furnace wall 5-1 is formed by welding steel plates into a protective plate through a channel steel frame, then pouring a heat insulation pouring material 502 and a refractory pouring material 501 on the protective plate in sequence, and paving a layer of rock wool plate 503 in the channel steel of the protective plate. The top layer structure 5-2 is composed of a refractory castable 501, a heat preservation castable 502 and a rock wool board 503 from bottom to top in sequence. The flue gas diversion slope surface 5-3 is formed by pouring a refractory castable 501 and a heat insulation castable 502.
The second separator outlet flue 5 is constructed as shown in fig. 3, and is surrounded by a brickwork 5-1, and a roof structure 5-2 is formed by casting. The structure of the furnace wall 5-1 is sequentially a refractory brick 601 and a machine-made red brick 602 from inside to outside; the top structure 5-2 is composed of a refractory castable 501, a heat preservation castable 502 and a rock wool board 503 from bottom to top in sequence.
The third separator outlet flue 5 is a heat-resistant steel flue, and has a structure as shown in fig. 4, and comprises a heat-resistant steel plate 701, an aluminum silicate plate 702, and a rock wool plate 503 which are welded in this order from the inside to the outside. The heat-resistant steel plate 701 can resist high temperature, but does not have a heat preservation effect, and in order to meet the temperature requirement of the outer surface, a heat-resistant aluminum silicate plate with a good heat preservation effect is introduced in the middle, and a heat-insulating material rock wool plate is used for the outer layer.
As can be seen from the above three structural forms, the outlet flue of the existing separator is a heat insulation flue, and in order to ensure heat insulation, the outlet flue of the existing separator is composed of three layers of structures, namely a fire-resistant layer, a heat insulation layer and a heat insulation layer. In summary, the inner refractory layer of the three types of insulating flues described above is made of a large amount of refractory casting material, refractory bricks or refractory steel plates, the intermediate insulating layer is made of insulating casting material or an air barrier layer based on red bricks, and the outer insulating layer is made of rock wool panels. In order to ensure that the temperature of the outer surface of the heat insulation layer at the outermost layer of the separator outlet flue 5 is within the range allowed by relevant standards, the three heat insulation flues need to be thicker, so that the cost is higher, the installation is complicated, and the installation period is long.
In addition, the three heat insulation flues in the prior art only have the function of a single flue gas flow channel and do not have other functions.
Disclosure of Invention
The invention aims to solve the problems at present and provides a separator outlet flue and a multi-flow circulating fluidized bed hot water boiler, which not only can reduce the material cost, but also reduces the casting or building links of a flue body and shortens the installation period; the heat absorption type boiler is used as an auxiliary heating surface of the boiler, and can also absorb the radiant heat of high-temperature flue gas in a flue, so that the heat efficiency of the boiler is improved.
The purpose of the invention is realized by the following technical scheme:
the invention provides an outlet flue of a separator,
the utility model provides a separator outlet flue is applicable to multiple process circulating fluidized bed boiler, and it includes:
a membrane wall assembly; the membrane wall assembly includes:
the system comprises a water inlet header, a membrane water-cooled wall structure, a membrane water-cooled wall suspender, a water outlet header and a header suspender;
after passing through the membrane wall structure, water in the water inlet header flows to the water outlet header; the water of the water outlet header is collected to an external water cooling system;
the number of the membrane water-cooled wall hanging rods is at least two, and the membrane water-cooled wall hanging rods are used for hanging the membrane water-cooled wall on a boiler steel frame;
the plurality of header hanger rods are uniformly arranged and used for hoisting the water inlet header and the water outlet header on the boiler steel frame;
rock wool boards for flue heat preservation are laid on the outer surfaces of the membrane wall structure, the water inlet header and the water outlet header;
and pouring corundum castable or coating wear-resistant paint on the inner side of the membrane water wall structure.
More preferably, said separator outlet flue further comprises:
the membrane wall structure includes: a top membrane water wall.
More preferably, said separator outlet flue further comprises:
a shield furnace wall; the guard plate furnace wall forms the peripheral furnace wall of the separator outlet flue;
a first sealing expansion joint and a second sealing expansion joint; the first sealing expansion joint is arranged at the junction of the water outlet header and the furnace walls of the front side guard plate and the rear side guard plate; the second sealing expansion joint is arranged at the junction of the top membrane water-cooled wall and the furnace walls of the left side guard plate and the right side guard plate.
More preferably, the membrane water wall structure further comprises:
a rear membrane wall;
and the rear membrane water-cooled wall and the top membrane water-cooled wall form a bent membrane water-cooled wall structure.
More preferably, said separator outlet flue further comprises:
the protective plate furnace walls enclose furnace walls on the front side, the left side and the right side of the separator outlet flue;
a first sealing expansion joint and a second sealing expansion joint; the first sealing expansion joint is arranged at the junction of the water outlet header and the front side guard plate furnace wall; the second sealing expansion joint is arranged at the junction of the top membrane water-cooled wall and the furnace walls of the left side guard plate and the right side guard plate.
More preferably, the membrane water wall structure further comprises: two side membrane type water-cooled walls; the membrane wall assembly further comprises: two side upper headers and two side lower headers; the water in the water inlet header flows to the lower headers on the two sides through the communicating pipe; the water flowing through the two side lower collecting tanks flows to the two side upper collecting tanks through the two side membrane water cooling walls; the water flowing through the header tanks on the two sides flows to the water outlet header tank;
more preferably, said separator outlet flue further comprises:
the guard plate furnace wall; the guard plate furnace wall forms a front side furnace wall of the separator outlet flue; the first sealing expansion joint, the third sealing expansion joint and the fourth sealing expansion joint;
the first sealing expansion joint is arranged at the junction of the water outlet header and the front side guard plate furnace wall; the third sealing expansion joint is arranged at the junction of the top membrane water-cooled wall and the rear membrane water-cooled wall and the membrane water-cooled walls at the two sides; and the fourth sealed expansion joint is arranged at the bottoms of the membrane water walls on the two sides and the junction of the lower header tanks on the two sides.
More preferably, the membrane wall structure further comprises: a front side membrane water-cooled wall; the membrane wall assembly further comprises: a front lower header and a fifth sealed expansion joint;
the front lower header is communicated with the two lower headers; the water flowing through the front lower header flows to the water outlet header through the front membrane water-cooled wall;
and the fifth sealed expansion joint is arranged at the junction of the bottom of the front side membrane water-cooled wall and the front side lower header.
More preferably, the protective plate furnace wall is formed by welding steel plates through a channel steel frame, then a heat-insulating castable and a refractory castable are sequentially poured on the protective plate, and a layer of rock wool plate is paved in the channel steel of the protective plate; or the structure of the plate-protecting furnace wall comprises refractory bricks and machine-made red bricks from inside to outside in sequence; or the structure of the plate protection furnace wall is a heat-resistant steel plate, an aluminum silicate plate and a rock wool plate which are welded from inside to outside in sequence.
The invention also provides a multi-process circulating fluidized bed hot water boiler which comprises a cyclone separator, a separator outlet flue, a tail flue and a tail heating surface, wherein the cyclone separator, the separator outlet flue, the tail flue and the tail heating surface are sequentially arranged in the follow-up process of the burnout chamber according to the flow direction of flue gas;
flue gas from the burnout chamber is treated by a cyclone separator, enters a separator outlet flue through a central cylinder, and enters a tail flue and a tail heating surface after passing through the separator outlet flue;
water of the economizer in the tail flue and the tail heating surface is collected to a water outlet header through a membrane water-cooled wall structure of the separator outlet flue; the water outlet header is connected with an external water cooling system through a communicating pipe.
The technical scheme of the invention can show that the invention has the following technical effects:
the invention changes the prior heat insulation flue which is only used for circulating the flue gas into a non-heat insulation flue which is partially or completely composed of a membrane water-cooled wall, thereby not only ensuring the circulation of the flue gas, but also adding another function to the flue: the heat absorption plate is used as an auxiliary heating surface of the boiler, absorbs the radiant heat of high-temperature flue gas in a flue, and improves the heat efficiency of the multi-flow circulating fluidized bed hot water boiler.
In addition, the heat preservation of the flue only needs to be realized by paving a rock wool plate on the outer sides of the membrane type water-cooled wall and the header, so that a large amount of refractory materials and heat preservation materials or heat-resistant steel plates are saved, the material cost is reduced, the casting or building links of the flue body are omitted, and the installation period is shortened.
Drawings
FIG. 1 is a schematic view showing a structure of a multi-pass circulating fluidized bed hot water boiler of the prior art;
FIG. 2 is a schematic diagram of a first separator outlet flue of the prior art;
FIG. 3 is a schematic diagram of a second separator outlet flue of the prior art;
FIG. 4 is a schematic diagram of a third separator outlet flue of the prior art;
FIG. 5-1 is a right side view of a structure according to an embodiment of the present invention;
FIG. 5-2 is a view A-A of FIG. 5-1;
FIG. 6-1 is a right side view of the structure of the second embodiment of the present invention;
FIG. 6-2 is a view B-B of FIG. 6-1;
FIG. 7-1 is a right side view of a three-configuration of an embodiment of the present invention;
FIG. 7-2 is a view C-C of FIG. 7-1;
FIG. 8-1 is a right side view of a fourth configuration of an embodiment of the present invention;
fig. 8-2 is a view D-D in fig. 8-1.
In the drawings:
the device comprises a main combustion chamber 1, an auxiliary combustion chamber 2, a burnout chamber 3, a cyclone separator 4, a separator outlet flue 5, a tail flue and a tail heating surface 6;
5-1 parts of furnace wall, 5-2 parts of top structure and 5-3 parts of flue gas diversion slope; refractory castable 501, heat-preservation castable 502 and rock wool board 503; a refractory brick 601 and a machine-made red brick 602; a heat-resistant steel plate 701, an aluminum silicate plate 702;
a panel wall 51; membrane wall structure 520, water inlet header 521, top membrane wall 522, membrane wall hanger 523, water outlet header 524, header hanger 525, first seal expansion joint 526, second seal expansion joint 527, and rear membrane wall 528; a two-side upper header 529, a two-side membrane water-cooled wall 5210, a two-side lower header 5211, a third sealing expansion joint 5212, a fourth sealing expansion joint 5213, a front-side membrane water-cooled wall 5214, a front-side lower header 5215, and a fifth sealing expansion joint 5216.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present application, the present invention will be further described in detail below with reference to the accompanying drawings.
The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.
The first embodiment is as follows:
according to the outlet flue of the separator provided by the embodiment of the invention, the top of the outlet flue is of a membrane wall structure, and the part is used as an auxiliary heating surface of a boiler and absorbs the radiant heat of high-temperature flue gas in the flue, so that the heat efficiency of the multi-process circulating fluidized bed hot water boiler can be improved. The structure of the separator outlet flue is shown in fig. 5-1 and 5-2, and comprises:
a panel furnace wall 51, a membrane water wall assembly 52 (not shown), and seals.
The shield walls 51 form the peripheral walls of the separator outlet flue, which are the same as in the prior art and will not be described in detail here.
Membrane water wall assembly 52 includes: membrane wall structure 520, inlet header 521, top membrane wall 522, membrane wall hanger 523, outlet header 524, header hanger 525. The sealing member is used for guaranteeing that the flue gas of the whole separator outlet flue does not leak, and comprises: a first sealing expansion joint 526 and a second sealing expansion joint 527.
The water inlet header 521 is connected with the economizer through a connecting pipe, and the lower part of the top membrane type water-cooled wall 522 is welded on the water inlet header 521; the upper part is welded on the water outlet header 524; the outlet header 524 is connected to an external water cooling system by a connection pipe.
At least two membrane wall hanger rods 523 are used to hoist the top membrane wall 522 to the boiler mounting. The header suspender 525 is a plurality of, and is evenly arranged for hoisting the inlet header 521 and the outlet header 524 on the boiler mounting frame.
The first sealing expansion joint 526 is arranged at the junction of the water outlet header 524 and the front and rear side guard plate furnace walls 51; a second sealed expansion joint 527 is provided at the intersection of the top membrane water wall 522 and the left and right skirt furnace walls 51. Both made of heat resistant stainless steel.
A layer of rock wool board is paved on the outer surfaces of the top membrane water-cooled wall 522 and the header (the water inlet header 521 and the water outlet header 524) for heat preservation of a flue;
corundum castable is poured or wear-resistant paint is smeared on the inner side of the top membrane type water wall 522, and the corundum castable is used for preventing flue gas from scouring and wearing the water wall pipe.
The working principle of the first embodiment is as follows:
the water heated by the economizer arranged on the tail flue and the tail heating surface 6 flows to the water inlet header 521 through the connecting pipe; after the inlet header 521 is filled with water, the water in the inlet header 521 flows to the outlet header 524 through the top membrane wall 522 under pressure, and then the water in the outlet header 524 flows to the outlet header of the water cooling system through the connecting pipe.
Example two:
in the second embodiment of the invention, the top and the rear wall of the outlet flue of the separator are formed by a bent membrane water-cooled wall, the second embodiment is modified on the basis of the first embodiment, so that the water inlet header 521 moves downwards, the top membrane water-cooled wall 522 also extends, the rear retaining wall in the first embodiment is also changed into a membrane water-cooled wall structure, namely the top and the rear are formed by a bent membrane water-cooled wall, the top is additionally provided with a group of membrane water-cooled wall hanging rods 523, and the sealing expansion joint is the same as that in the first embodiment. The structure of which is shown in fig. 6-1 and 6-2, comprising:
a panel furnace wall 51, a membrane water wall assembly 52 and seals.
The shield walls 51 form the front, left and right three side walls of the separator outlet flue, which are the same as in the prior art and will not be described in detail here.
Membrane water wall structure 520 in membrane water wall assembly 52 includes an aft membrane water wall 528 in addition to top membrane water wall 522 in the first embodiment.
The water inlet header 521 is connected with the economizer through a connecting pipe; the top membrane wall 522 and the rear membrane wall 528 form a curved membrane wall structure, the lower portion of which is welded to the inlet header 521 and the upper portion of which is welded to the outlet header 524; the outlet header 524 is connected to an external water cooling system by a connection pipe.
At least two membrane water-cooled wall hanging rods 523 are used for hanging the top membrane water-cooled wall 522 on a boiler steel frame. The header suspender 525 is a plurality of, and is evenly arranged for hoisting the water inlet header 521 and the water outlet header 524 on the boiler steel frame. The seal comprises a first seal expansion joint 526 and a second seal expansion joint 527; a first sealing expansion joint 526 is arranged at the junction of the water outlet header 524 and the front side guard plate furnace wall 51; a second sealed expansion joint 527 is provided at the intersection of the curved membrane water wall structure formed by top membrane water wall 522 and rear membrane water wall 528 and left and right skirt furnace walls 51.
As in the previous embodiment, the outer surfaces of the top membrane water wall 522, the rear membrane water wall 528 and the header (inlet header 521 and outlet header 524) in the second embodiment are paved with rock wool boards for flue insulation; and corundum castable or wear-resistant paint is poured or smeared on the inner sides of the top membrane water-cooled wall 522 and the rear membrane water-cooled wall 528.
The working principle of the second embodiment is as follows:
the water heated by the economizer flows to the water inlet header 521 through a connecting pipe; after the inlet header 521 is filled with water, the water in the inlet header 521 flows through the top membrane wall 522 into the rear membrane wall 528 under pressure, and then is collected in the outlet header 524 through the rear membrane wall 528, and then the water in the outlet header 524 flows to the outlet header of the water cooling system through the connection pipe.
Example three:
in the outlet flue of the separator provided in the third embodiment of the present invention, the membrane water wall structure 520 is composed of the top membrane water wall 522, the rear membrane water wall 528, and the two side membrane water walls 5210, and compared with the second embodiment, the membrane water wall assembly further includes the following components: the two-side upper header 529, the two-side lower header 5211, and the sealing member include a third sealing expansion joint 5212 and a fourth sealing expansion joint 5213, and the structure of this embodiment three is shown in fig. 7-1 and 7-2, and includes:
a panel furnace wall 51, a membrane water wall assembly 52 and seals.
The apron wall 51 constitutes the front side wall of the separator outlet flue, which is the same as in the prior art and will not be described in detail here.
Membrane water wall structure 520 in membrane water wall assembly 52 includes two side membrane water walls 5210 in addition to top membrane water wall 522 and back membrane water wall 528 in example two. Furthermore, membrane water wall assembly 52 includes a two-sided upper header 529 and a two-sided lower header 5211 in addition to the related components of embodiment two. The seal includes a first seal expansion joint 526, a third seal expansion joint 5212 and a fourth seal expansion joint 5213; a first sealing expansion joint 526 is arranged at the junction of the water outlet header 524 and the front side guard plate furnace wall 51; third sealed expansion joints 5212 are provided at the interface of the top and rear membrane walls 528 and the two side membrane walls 5210; fourth sealed expansion joints 5213 are provided at the bottom of the two side membrane walls 5210 and at the junction of the two side lower headers 5211.
The connection relationship among the components in the third embodiment is as follows:
the water inlet header 521 is connected with the economizer through a connecting pipe; top membrane water wall 522 and rear membrane water wall 528 form a curved membrane water wall structure with a lower portion welded to inlet header 521 and an upper portion welded to outlet header 524. The inlet header 521 is connected to the two side lower headers 5211, the lower ends of the two side membrane walls 5210 are welded to the two side lower headers 5211, and the upper ends are welded to the outlet header 524. The outlet header 524 is connected to an external water cooling system by a connection pipe.
The arrangement and operation of the membrane wall boom 523 and the header boom 525 are the same as described in the embodiments and will not be described in detail herein.
As in the previous embodiment, the outer surfaces of the top membrane water wall 522, the rear membrane water wall 528 and the two side membrane water walls 5210, and the headers (the inlet header 521, the outlet header 524, the two side upper headers 529 and the two side lower headers 5211) in this embodiment are lined with rock wool panels for flue insulation; corundum castable or wear-resistant paint is poured or smeared on the inner sides of the top membrane water-cooled wall 522, the rear membrane water-cooled wall 528 and the two side membrane water-cooled walls 5210.
The working principle of the third embodiment is as follows:
the water passing through the economizer flows to the inlet header 521 through a connection pipe, and the water flows to the lower headers 5211 on both sides through the inlet header 521; after the inlet header 521 and the lower headers 5211 on both sides are filled with water, the water in the inlet header 521 is collected into the outlet header 524 through the top membrane water wall 522 and the rear membrane water wall 528 under the action of pressure; the water in the lower headers 5211 on both sides flows to the upper headers 529 on both sides through the membrane water walls 5210 on both sides, and the water in the upper headers 529 on both sides flows to the outlet headers 524 after passing through the membrane water walls 5210 on both sides; the water in the outlet header 524 flows to the outlet header of the water cooling system through the connection pipe.
Example four:
in the outlet flue of the separator provided by the fourth embodiment of the present invention, the top and the periphery of the outlet flue are all formed by membrane water walls, and the structure is based on the third embodiment, the front retaining wall is also changed into a membrane water wall structure, and the added components are a front membrane water wall 5214, a front lower header 5215 and a fifth sealed expansion joint 5216. The structure of which is shown in fig. 8-1 and 8-2, comprising:
membrane water wall assembly 52 and seals.
The membrane water wall structure 520 in this membrane water wall assembly 52 includes, in addition to all of the components in example three, a front side membrane water wall 5214; the respective membrane water wall assemblies 52 also include a front side lower header 5215; the seal includes a fifth seal expansion joint 5216 disposed at the bottom of front membrane water wall 5214 and front lower header 5215 interface.
The connection relationship among the respective components in the fourth embodiment is as follows:
the water inlet header 521 is connected with the economizer through a connecting pipe; top membrane water wall 522 and rear membrane water wall 528 form a curved membrane water wall structure with a lower portion welded to inlet header 521 and an upper portion welded to outlet header 524. The inlet header 521 is connected to the two side lower headers 5211, the lower ends of the two side membrane walls 5210 are welded to the two side lower headers 5211, and the upper ends are welded to the outlet header 524. The both-side lower header 5211 is communicated with the front lower header 5215, and the lower portion of the front membrane type water-cooled wall 5214 is welded to the front lower header 5215 and the upper portion thereof is welded to the outlet header 524. The outlet header 524 is connected to an external water cooling system by a connection pipe.
The arrangement and operation of the membrane wall boom 523 and the header boom 525 are the same as described in the embodiments and will not be described in detail herein.
The working principle of the fourth embodiment is as follows:
the water heated by the economizer flows to the inlet header 521 through the connection pipe, passes through the inlet header 521 and the lower headers 5211 at both sides, and then flows to the lower header 5215 at the front side. After the four headers, the inlet header 521, the two side lower headers 5211, and the front lower header 5215, are filled with water, the water in the inlet header 521 flows to the outlet header 524 through the top membrane wall 522 and the rear membrane wall 528 under the action of pressure; the water in the lower headers 5211 on both sides flows through the membrane walls 5210 on both sides to the upper headers 529 on both sides, and then flows to the effluent headers 524; water in the front lower header 5215 flows through the front membrane waterwall 5214 to the effluent header 524; all the water collected to the outlet header 524 flows into the outlet header of the water cooling system through the connection pipe.
The first to fourth embodiments are applicable to the multi-pass circulating fluidized bed hot water boiler. The outlet flue of the separator can ensure the circulation of the flue gas, and the membrane water-cooled wall structure can also be used as an auxiliary heating surface of a boiler to absorb the radiant heat of high-temperature flue gas in the flue and improve the heat efficiency of the multi-process circulating fluidized bed hot water boiler.
Example five:
the invention also provides a multi-process circulating fluidized bed hot water boiler which comprises a main combustion chamber 1, an auxiliary combustion chamber 2 arranged in parallel with the main combustion chamber 1, a burnout chamber 3 arranged in parallel with the auxiliary combustion chamber 2, a cyclone separator 4, a separator outlet flue 5, a tail flue and a tail heating surface 6, wherein the cyclone separator 4, the separator outlet flue 5 and the tail flue and the tail heating surface 6 are sequentially arranged in the follow-up process of the burnout chamber 3 according to the flow direction of flue gas, and the tail flue and the tail heating surface 6 are provided with coal economizers. The separator outlet flue 5 is any one of the separator outlet flues of the first to fourth embodiments.
The flue gas from the burnout chamber 3 is treated by a cyclone separator 4, enters a separator outlet flue 5 through a central cylinder, and enters a tail flue and a tail heating surface 6 after passing through the separator outlet flue 5. The water flow of the economizer arranged in the tail flue and the tail heating surface 6 passes through the membrane water-cooled wall of the separator outlet flue and then is collected into the water outlet header 524; the water exiting header 524 flows to an external water cooling system.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (10)
1. The utility model provides a separator outlet flue is applicable to multithread circulation fluidized bed boiler, its characterized in that, separator outlet flue includes:
a membrane water wall assembly (52); the membrane water wall assembly (52) includes:
the system comprises a water inlet header (521), a membrane water-cooled wall structure (520), a membrane water-cooled wall suspender (523), a water outlet header (524) and a header suspender (525);
the water in the water inlet header (521) flows to the water outlet header (524) after passing through the membrane wall structure (520); the water in the water outlet header (524) is collected to an external water cooling system;
at least two membrane water-cooled wall hanging rods (523) are used for hanging the membrane water-cooled wall on a boiler steel frame;
the plurality of header suspenders (525) are uniformly arranged and used for hoisting the water inlet header (521) and the water outlet header (524) on a boiler steel frame;
rock wool boards for flue heat preservation are paved on the outer surfaces of the membrane wall structure (520), the water inlet header (521) and the water outlet header (524);
and pouring corundum castable or coating wear-resistant paint on the inner side of the membrane water wall structure (520).
2. The separator outlet flue of claim 1 further comprising:
the membrane water wall structure (520) includes: a top membrane water wall (522).
3. A separator outlet flue according to claim 2 further comprising:
a shield enclosure (51); the guard plate furnace wall (51) forms the peripheral furnace wall of the separator outlet flue;
a first sealing expansion joint (526) and a second sealing expansion joint (527); the first sealing expansion joint (526) is arranged at the junction of the water outlet header (524) and the front and rear side guard plate furnace walls (51); the second sealing expansion joint (527) is arranged at the junction of the top membrane water-cooled wall (522) and the left and right side guard plate furnace walls (51).
4. A separator outlet flue according to claim 2 wherein the membrane water wall structure (520) further comprises:
a rear membrane water wall (528);
the rear membrane water wall (528) and the top membrane water wall (522) form a curved membrane water wall structure.
5. A separator outlet flue according to claim 4 further comprising:
the protective plate furnace wall (51), the protective plate furnace wall (51) encloses the furnace walls on the front side, the left side and the right side of the separator outlet flue;
a first sealing expansion joint (526) and a second sealing expansion joint (527); the first sealing expansion joint (526) is arranged at the junction of the water outlet header (524) and the front side guard plate furnace wall (51); the second sealing expansion joint (527) is arranged at the junction of the top membrane water-cooled wall (522) and the left and right side guard plate furnace walls (51).
6. A separator outlet flue according to claim 4,
the membrane water wall structure (520) further comprises: a two-sided membrane water wall (5210);
the membrane water wall assembly (52) further comprising: two-side upper header (529) and two-side lower header (5211);
the water in the water inlet header (521) flows to the two side lower headers (5211) through a communicating pipe; the water flowing through the both-side lower headers (5211) flows to the both-side upper headers (529) through the both-side membrane water-cooled walls (5210); the water flowing through the header (529) on both sides flows to the outlet header (524).
7. A separator outlet flue according to claim 6 further comprising:
the shield furnace wall (51); the guard plate furnace wall (51) forms a front side furnace wall of the separator outlet flue;
a first seal expansion joint (526), a third seal expansion joint (5212), and a fourth seal expansion joint (5213);
the first sealing expansion joint (526) is arranged at the junction of the water outlet header (524) and the front side guard plate furnace wall (51); the third sealed expansion joints (5212) are arranged at the junctions of the top and rear membrane water walls (528) and the two side membrane water walls (5210); the fourth sealed expansion joints (5213) are arranged at the junction of the bottoms of the membrane water walls (5210) on the two sides and the lower header tanks (5211) on the two sides.
8. A separator outlet flue according to claim 6,
the membrane water wall structure (520) further comprises: a front-side membrane waterwall (5214);
the membrane water wall assembly (52) further comprising: a front lower header (5215) and a fifth sealed expansion joint (5216);
the front lower header (5215) is communicated with the two side lower headers (5211); the water flowing through the front lower header (5215) flows to the outlet header (524) through the front membrane water-cooled wall (5214);
and the fifth sealed expansion joint (5216) is arranged at the junction of the bottom of the front side membrane water-cooled wall (5214) and the front side lower header (5215).
9. A separator outlet flue according to claim 3, 5 or 7,
the protective plate furnace wall (51) is formed by welding steel plates into a protective plate through a channel steel frame, then a heat insulation castable (502) and a refractory castable (501) are sequentially poured on the protective plate, and a layer of rock wool plate (503) is paved in the channel steel of the protective plate;
or,
the structure of the protective plate furnace wall (51) is sequentially provided with refractory bricks (601) and machine-made red bricks (602) from inside to outside;
or,
the structure of the protective plate furnace wall (51) is sequentially a heat-resistant steel plate (701), an aluminum silicate plate (702) and a rock wool plate (503) which are welded from inside to outside.
10. A multi-flow circulating fluidized bed hot water boiler comprises a cyclone separator (4), a separator outlet flue (5), a tail flue and a tail heating surface (6) which are sequentially arranged in the subsequent flow of a burnout chamber (3) according to the flow direction of flue gas, wherein the tail flue and the tail heating surface (6) are provided with coal economizers, and is characterized in that,
-the separator outlet flue (5) is a separator outlet flue according to any of the preceding claims 1-9;
flue gas from the burnout chamber (3) is treated by a cyclone separator (4), enters a separator outlet flue (5) through a central cylinder, and enters a tail flue and a tail heating surface (6) through the separator outlet flue (5);
water of the economizer in the tail flue and the tail heating surface (6) is collected to an outlet water header (524) through a membrane water-cooled wall structure (520) of the separator outlet flue; the water outlet header (524) is connected with an external water cooling system through a communicating pipe.
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Address after: Room A306, Auxiliary Building, A79 Shuangqing Road, Haidian District, Beijing, 100089 Patentee after: Rehua Energy Co.,Ltd. Address before: Room A306, Auxiliary Building, A79 Shuangqing Road, Haidian District, Beijing, 100089 Patentee before: Beijing Rehua Energy Co.,Ltd. |
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Address after: Room A306, Auxiliary Building, A79 Shuangqing Road, Haidian District, Beijing, 100089 Patentee after: Beijing Rehua Energy Co.,Ltd. Address before: 100089 A109, Academic Research Complex Building, Tsinghua University, Haidian District, Beijing Patentee before: BEIJING NOWVA ENERGY TECHNOLOGY Co.,Ltd. |