CN212081220U - Novel circulating fluidized bed boiler material returning device - Google Patents
Novel circulating fluidized bed boiler material returning device Download PDFInfo
- Publication number
- CN212081220U CN212081220U CN201922485824.3U CN201922485824U CN212081220U CN 212081220 U CN212081220 U CN 212081220U CN 201922485824 U CN201922485824 U CN 201922485824U CN 212081220 U CN212081220 U CN 212081220U
- Authority
- CN
- China
- Prior art keywords
- material returning
- chamber
- return
- air
- box
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
The utility model relates to a novel circulating fluidized bed boiler material returning device, which comprises a dipleg, a material returning box and a material returning pipe, wherein the top of the material returning box is provided with a material inlet, one side of the material returning box, which is far away from the material inlet, is provided with a material outlet, the dipleg is communicated with the material inlet, the material outlet is communicated with the material returning pipe, the bottom of the material returning box is provided with an air distribution plate, the air distribution plate is provided with a plurality of air hoods, the air hoods are gradually arranged from one end close to the material inlet to one end of the material returning opening, one side of the material returning box, which is close to the material inlet, is provided with an inclined side bottom plate, the middle part of the material returning box is provided with a baffle, the connecting parts of the baffle and the two opposite side walls and the top surface of the material returning box are sealed, the U-shaped material returning box is separated into a material returning chamber and a fluidizing chamber, the material flows stably, and simple structure is stable.
Description
Technical Field
The utility model relates to a novel circulating fluidized bed boiler feed back device belongs to fluidized bed boiler technical field.
Background
The material returning device is one of the key parts of the circulating fluidized bed boiler, and is mainly used for classifying a large amount of high-temperature particles which are carried in the flue gas and are not burnt out, and sending the particles back to the combustion chamber so as to maintain the rapid fluidized state of the combustion chamber and ensure that the fuel and the desulfurizer are repeatedly circulated and repeatedly combusted, thereby being beneficial to achieving ideal combustion and desulfurization efficiency. Therefore, the performance of the material returning device system of the circulating fluidized bed boiler directly influences the safe and economic operation of the boiler. If the feed returning device stops working suddenly, the quantity of the circulating materials in the boiler is insufficient, the bed temperature rises suddenly and is difficult to control, and the load and the normal operation of the boiler are endangered. Because of the important role played by the material returning device in the fluidized boiler, people pay more and more attention to the research on the material returning device, and the existing material returning devices have advantages and disadvantages and need to be perfected in industry. The circulating fluidized bed boiler is provided with a plurality of material returning devices which are non-mechanical automatic adjustment type fluidization sealing material returning devices, the fluidization chambers and the air distribution chambers of the material returning devices have the same space, the air quantity and the air distribution mode are also the same, and the material returning devices are also provided with L valves or J-shaped valves and reversing sealing valves in the change forms, so that the problems of unstable operation caused by the stagnation of operation, fluidization dead angles and unsmooth material circulation can occur in the operation of the material returning devices.
Disclosure of Invention
In order to solve the technical problem, the utility model aims at providing a novel circulating fluidized bed boiler returning charge device, the device simple structure can effectively solve above-mentioned problem, its characterized in that: a novel material returning device of a circulating fluidized bed boiler comprises a dipleg, a material returning box and a material returning pipe, wherein a material inlet is formed in the top of the material returning box, a material outlet is formed in one side, away from the material inlet, of the material returning box, the dipleg is communicated with the material inlet, the material outlet is communicated with the material returning pipe, an air distribution plate is arranged at the bottom of the material returning box, a plurality of air hoods are arranged on the air distribution plate, and the air hoods are gradually dense from one end, close to the material inlet, to one end of the material returning opening; an inclined side bottom plate is arranged on one side, close to the feeding port, in the material returning box, and an included angle of 60 degrees is formed between the side bottom plate and the air distribution plate; a partition plate is arranged in the middle of the inside of the return box, the joints of the partition plate and the two opposite side walls and the top surface of the return box are sealed, and the partition plate and the air distribution plate are spaced at a certain interval; the baffle separates the return box U type and divide into return chamber and fluidization chamber, the fluidization chamber is located the one side that is close to the discharge gate, the return chamber is located the one side that is close to the pan feeding mouth, fluidization chamber space is greater than the return chamber.
On the basis of the above scheme and as a preferable scheme of the scheme: the blast caps are divided into bell-jar type blast caps and one-way blast caps, the one-way blast caps are arranged on the air distribution plate in the fluidizing chamber, and the bell-jar type blast caps are arranged on the air distribution plate in the material returning chamber.
On the basis of the above scheme and as a preferable scheme of the scheme: the material returning pipe is obliquely arranged downwards and communicated with the hearth.
On the basis of the above scheme and as a preferable scheme of the scheme: the furnace hearth structure is characterized by further comprising a steel plate connecting piece, wherein the steel plate connecting piece is welded on the outer wall of the furnace hearth and welded with the return pipe, and the return pipe is provided with an expansion joint.
On the basis of the above scheme and as a preferable scheme of the scheme: an air chamber is arranged below the air distribution plate, the air chamber is connected with the air distribution plate in a sealing mode, a bottom plate of the air chamber is arranged in an inclined mode, and a slag discharging opening is formed in the bottom plate.
Compared with the prior art, the utility model outstanding and profitable technological effect is:
the fluidization chamber and the material returning chamber are separated by the partition plate and then communicated to form a U-shaped channel, which is equivalent to a U-shaped valve capable of continuously returning materials, has self-balancing property in a fluidization state, and can prevent the problem of gas short circuit caused by the fact that gas in the furnace flows back to enter a material returning system;
the space of the fluidization chamber is larger than that of the return chamber, so that air supply from a single air chamber is reasonably distributed, and small air quantity air supply of the return chamber and large air quantity air supply of the fluidization chamber are ensured, so that smooth flowing of circulating ash in the return device is ensured;
the air caps on the air distribution plate are distributed densely and sparsely, one-way air caps with large ventilation quantity are arranged in dense areas of the fluidizing chamber, the distribution density of the material returning chamber is low, and bell-jar type air caps are arranged, so that pressure difference is formed by simple structural arrangement, gas back-flowing is avoided, and the material flow is stable;
the side bottom plate arranged obliquely avoids material stacking, and further ensures smooth flowing of circulating ash;
a hanger rod and a spring hanger are eliminated, a return pipe is welded with a hearth by a steel plate connecting piece, and an expansion joint is arranged on the return pipe, so that the structure is simple, and the problem that the connecting part of the return pipe and the hearth is frequently torn is solved;
the material returning pipe is obliquely arranged and connected with the hearth, so that the material can flow out conveniently;
the bottom plate of the air chamber is obliquely arranged, so that the heavier fly ash can be conveniently discharged from the slag discharge port.
Drawings
Fig. 1 is an overall schematic diagram of a material returning device.
Detailed Description
In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, the utility model aims at providing a novel circulating fluidized bed boiler material returning device, including dipleg 1, the vertical setting of dipleg 1, dipleg 1 is connected with return bin 2, and the intercommunication end is the pan feeding mouth 21 of return bin 2, and dipleg 1 is used for the leading-in returning charge device of circulation ash in the separator, and the upper left end and the return pipe 3 of return bin 2 are connected, the slope of return pipe 3 sets up in order to make things convenient for the material of insufficient combustion to arrange furnace 4 and reuse, and the end of communicating of return pipe 3 and return bin 2 is discharge gate 22.
Still be equipped with high temperature resistant baffle 23 in the return box 2, baffle 23 and the top and the both sides wall welded fastening of return box 2, certain clearance is left with the bottom to the lower extreme, reach sealed effect, the establishment of baffle 23 separates return box 2U type and divide into return chamber 24 and fluidization chamber 25, return chamber 24 is located the right side, be close to pan feeding mouth 21, fluidization chamber 25 is located the left side and is close to discharge gate 22, the space of fluidization chamber 25 is greater than the space of return chamber 24, be equivalent to a U type valve can carry out continuous returning charge, have the self-balancing characteristic under the fluidization state, can stop because of the gas short circuit problem that the interior gas of stove refluxes and get into the return system and cause.
Considering that the circulating ash needs to flow from the feeding port 21 to the discharging port 22 in the returning box 2, the bottom of the returning box 2 is provided with the air distribution plate 5, the air distribution plate 5 is provided with a plurality of air cap holes, the air caps 51 are fixed on the air distribution plate 5 in a welding mode, the arrangement of the air cap holes on the air distribution plate 5 is gradually changed from one end close to the feeding port 21 to one end of the discharging port 22, the air caps 51 on one side close to the feeding port 21 are arranged sparsely, and the air caps 51 on one side close to the discharging port 22 are arranged densely, so that pressure difference is formed in the returning box 2 to avoid gas channeling, and the material flow is stable and smooth.
The lower part of the right side wall of the return box 2 is provided with an inclined side bottom plate 26, the side bottom plate 26 and the air distribution plate 5 form an included angle of 60 degrees, the inclined arrangement can avoid material stacking, and the smooth flowing of circulating ash is further ensured.
The air caps 51 arranged on the air distribution plate 5 are divided into two types, the dense area of the air caps 51 in the fluidization chamber 25 is provided with the one-way air cap 511 with large ventilation volume, the area with small density of the material returning chamber 24 is provided with the bell-shaped air cap 512, the aperture of the bell-shaped air cap 512 is small, the air speed is high, the material accumulation is avoided, the air aperture of the one-way air cap 511 is large, the material can be upwards blown to the material outlet 22 due to large ventilation volume, and the circulation is smooth.
The lower part of the air distribution plate 5 is fixedly connected with the air chamber 6, the joints around the air chamber 6 are sealed, an air port 61 is arranged at the right end of the air chamber 6 and used for guiding fluidized air and return air, a bottom plate 62 at the lower end of the air chamber 6 is obliquely arranged, and a slag discharging port 63 is obliquely arranged on the bottom plate 62 and is convenient for discharging large-particle waste slag by utilizing gravity.
Considering that the return pipe 3 usually adopts the jib, the spring hanger suspends in midair on the fixed beam, the easy water-cooling wall that drives of furnace 4 of return pipe 3 expands, often cause the return pipe 3 to tear with furnace 4 junction, the emergence leaks cigarette and leaks fire, must shut down the stove maintenance, so the return pipe 3 of this device adopts steel sheet connecting piece 31 to become an organic whole structure with the welding of furnace 4 with return pipe 3, be equipped with expansion joint 32 in return pipe 3 and discharge gate 22 junction, with axial compensation deformation, eliminate the destruction that the stress that produces because of the displacement of expansion caused, this simple structure is effective, the problem of the frequent tear of return pipe 3 with furnace 4 connecting portion has been solved.
Furthermore, the material returning device of the boiler usually adopts a mode of arranging two material returning pipes 3 back walls in the middle, and the characteristics of the arrangement of the two material returning pipes 3 back walls in the middle are that the uniformity of the material returning circulating ash is poor, the mixing property with the coal as fired is poor, the tail smoke temperature deviation is large, the bed temperature deviation is large, the mode of evenly distributing the four material returning pipes 3 back walls is preferably changed into, after the operation, the material returning circulating ash and the coal as fired are mixed extremely uniformly, the tail smoke temperature deviation disappears, the bed temperature is uniform, and the economic benefit is obvious.
The specific working principle is as follows: circulating materials (fly ash) separated by a separator (not shown in the figure) pass through the dipleg 1 and enter the return chamber 24 from the feeding port 21 under the pushing of the gravity of the dipleg, the air cap 51 on the air distribution plate 5 is arranged to gradually become dense from the return chamber 24 to the fluidizing chamber 25, so that the return chamber 24 is ensured to provide loose air with small air volume, the fluidizing chamber 25 is provided with fluidized air with large air volume, the materials in the return chamber 24 are guided by the loose air provided by the bell-jar type air cap 512 to enter the fluidizing chamber 25, the materials are rapidly conveyed to the return pipe 3 by the large air volume in the fluidizing chamber 25 and finally sent back to the hearth 4, the baffle 23 is arranged to avoid gas backflow, and large-particle materials can be discharged through the slag discharge port 63.
It is worth mentioning that the technical features such as the furnace that the utility model discloses a patent application relates to should be regarded as prior art, and the concrete structure of these technical features, theory of operation and the control mode that may involve, spatial arrangement mode adopt the conventional selection in this field can, should not be regarded as the invention point of the utility model discloses a, the utility model discloses a do not do further specifically expand the detailed description.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (5)
1. A novel material returning device of a circulating fluidized bed boiler comprises a dipleg, a material returning box and a material returning pipe, wherein the material returning pipe is connected with the dipleg
The top of workbin is equipped with the pan feeding mouth, the one side that the pan feeding mouth was kept away from to the return workbin is equipped with the discharge gate, dipleg and pan feeding mouth intercommunication, discharge gate and return pipe intercommunication, the return workbin bottom is equipped with air distribution plate, its characterized in that: the air distribution plate is provided with a plurality of air caps, and the arrangement of the air caps gradually becomes dense from one end close to the material inlet to one end of the material return port; an inclined side bottom plate is arranged on one side, close to the feeding port, in the material returning box, and an included angle of 60 degrees is formed between the side bottom plate and the air distribution plate; a partition plate is arranged in the middle of the inside of the return box, the joints of the partition plate and the two opposite side walls and the top surface of the return box are sealed, and a gap is reserved between the partition plate and the air distribution plate; the baffle separates the return box U type and divide into return chamber and fluidization chamber, the fluidization chamber is located the one side that is close to the discharge gate, the return chamber is located the one side that is close to the pan feeding mouth, fluidization chamber space is greater than the return chamber.
2. The novel circulating fluidized bed boiler feed back device of claim 1, wherein: the above-mentioned
The blast cap comprises a bell-jar type blast cap and a one-way blast cap, the one-way blast cap is arranged on an air distribution plate in the fluidizing chamber, and the bell-jar type blast cap is arranged on the air distribution plate of the material returning chamber.
3. The novel circulating fluidized bed boiler feed back device of claim 1, wherein: the above-mentioned
The material returning pipe is obliquely arranged downwards and communicated with the hearth.
4. The novel circulating fluidized bed boiler feed back device of claim 3, wherein: bag for returning
Draw together the steel sheet connecting piece, the welding of steel sheet connecting piece is at the furnace outer wall, the steel sheet connecting piece welds with the return pipe, the return pipe is equipped with the expansion joint with the discharge gate junction.
5. The novel circulating fluidized bed boiler feed back device of claim 1, wherein: the above-mentioned
An air chamber is arranged below the air distribution plate, a bottom plate of the air chamber is obliquely arranged, and the bottom plate is provided with a slag discharge hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922485824.3U CN212081220U (en) | 2019-12-30 | 2019-12-30 | Novel circulating fluidized bed boiler material returning device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922485824.3U CN212081220U (en) | 2019-12-30 | 2019-12-30 | Novel circulating fluidized bed boiler material returning device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212081220U true CN212081220U (en) | 2020-12-04 |
Family
ID=73566413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922485824.3U Active CN212081220U (en) | 2019-12-30 | 2019-12-30 | Novel circulating fluidized bed boiler material returning device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212081220U (en) |
-
2019
- 2019-12-30 CN CN201922485824.3U patent/CN212081220U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110260301B (en) | Ultralow-emission energy-saving biomass circulating fluidized bed boiler | |
| CN107191925A (en) | A kind of CFBB and its abnormal method of adjustment of returning charge | |
| CN104654289B (en) | A kind of crop straw burning fluidized-bed combustion boiler | |
| CN212081220U (en) | Novel circulating fluidized bed boiler material returning device | |
| CN104676617B (en) | A kind of burning boiler flue accumulation prevention structure | |
| CN204629539U (en) | Burning boiler flue accumulation prevention structure | |
| CN2593064Y (en) | Boiler primary air pressurized dense-phase zone charge returning apparatus | |
| JP2015004466A (en) | Circulating fluidized-bed boiler | |
| CN103104912A (en) | Circulating fluidized bed boiler for coal water slurry combustion | |
| CN1312431C (en) | Sealed fluid back-feeder | |
| CN105927975B (en) | A kind of air distribution plate, selective deslagging device and multipath circulating fluidized bed boiler | |
| CN105927972A (en) | Wind distribution device facilitating discharging of big particle matter and multi-flow circulating fluidized bed boiler | |
| JP5422514B2 (en) | Solid fuel fired boiler | |
| CN2747467Y (en) | Fluidised sealed material return device | |
| CN111706856B (en) | Offset type feed back control device suitable for high temperature | |
| KR101560715B1 (en) | Air distribution-manifold for fluidzed bed boiler | |
| CN210150727U (en) | Sulfur burning system | |
| CN202470044U (en) | Co-burning device for low-speed fluidized bed and low calorific value waste gases | |
| CN204629528U (en) | A kind of burning boiler material circulating system | |
| CN204629464U (en) | Crop straw burning fluidized-bed combustion boiler | |
| CZ289157B6 (en) | Fluidized bed system | |
| CN104713106A (en) | Incineration boiler tail flue structure | |
| CN218409913U (en) | Material returning device system of circulating fluidized bed boiler | |
| CN204629529U (en) | Burning boiler back-end ductwork structure | |
| CN215765059U (en) | Stepped slag discharging device of circulating fluidized bed boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |