CN211204034U - Low-speed fluidized bed type corner tube boiler - Google Patents
Low-speed fluidized bed type corner tube boiler Download PDFInfo
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- CN211204034U CN211204034U CN201921681804.7U CN201921681804U CN211204034U CN 211204034 U CN211204034 U CN 211204034U CN 201921681804 U CN201921681804 U CN 201921681804U CN 211204034 U CN211204034 U CN 211204034U
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- fluidized bed
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- air distribution
- combustion chamber
- speed fluidized
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Abstract
The utility model discloses a low-speed fluidized bed type corner tube boiler, which belongs to the technical field of heat energy engineering and comprises a boiler body, a feeding mechanism, a primary air distribution device and a secondary air distribution device, wherein the boiler body is a single-drum horizontal corner tube boiler and comprises a combustion chamber; the lower part of the combustion chamber is a low-speed fluidized bed, and a flag-type inclined buried pipe is arranged in the low-speed fluidized bed and divides the combustion chamber into a dense-phase region and a dilute-phase region; and the nozzle of the secondary air distribution device is arranged in the combustion chamber and provides tangential air distribution. The boiler can burn simply compressed straw particles, reduces the cost, has even air distribution, combines layer combustion and fluidization, and has more sufficient combustion.
Description
Technical Field
The utility model belongs to the technical field of heat energy engineering, especially, involve a low-speed fluidized bed formula corner tube boiler.
Background
The crop straw is used as a byproduct of agricultural production, and has large yield and wide distribution. According to statistics, 6.2 million tons of crop straws are produced in China every year, the quantity of the crop straws is more than 50 times of the grass mowing quantity of northern grasslands, and the resource ownership is at the top of the world. After the general income increase of agriculture, the crop straws are more and more, but the comprehensive utilization is lagged, and the straws are excessive. The biomass energy power generation and the biological particle fuel are developed, coal substitution is implemented, the emission of carbon dioxide and sulfur dioxide can be obviously reduced, huge environmental benefits are generated, and with the improvement of the requirement on environmental standards, the national emission control on atmospheric pollutants is stricter, and the method is dedicated to the clean fuel technology. Compared with the traditional fossil fuel, the biomass energy belongs to clean energy, the carbon dioxide emission belongs to the carbon cycle of the nature, and no pollution is formed. And the sulfur content of biomass energy is extremely low, only three thousandths, and is less than 1/4 of the sulfur content of coal.
At present, the boiler burning straws is formed by reforming a coal-fired boiler, wherein most direct-fired boilers have the problems of insufficient output and insufficient combustion. The angle tube boiler is a novel boiler with novel structure, low metal consumption and high technical content, and has compact structure, steel saving, and convenient assembly and integral installation. The corner tube boiler has the characteristics that: the full water pipe is fully welded, the membrane wall structure is adopted, the sealing performance is good, and the air leakage is less; the pipe laying type light furnace wall has the advantages that the boiler is started quickly, and the standby loss is small; a body steel frame is not needed, and self-supporting is adopted; the boiler has the advantages that steel is saved, so that the cost is reduced, the market competitiveness is improved, but the existing corner tube boiler adopts a layer combustion mode from the introduction to the present, such as a reciprocating grate, a chain grate and the like, the problems of low combustion efficiency, incomplete combustion, coal leakage, uneven air distribution, poor coal applicability, coal picking, high-quality coal for combustion and the like generally exist, the thermal efficiency of the boiler is low, the energy is wasted, and the environment is polluted.
On the other hand, the biomass particles meeting the national standard for combustion have the problem of overhigh price, and the common boiler is not suitable for simply compressed straw particles (the particle size is 0-30 mm, and the density is less than 800kg/m 3).
Therefore, there is a need in the art for a new solution to solve this problem.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art existence, the utility model provides a low-speed fluidized bed formula corner tube boiler for solve the straw granule (granularity 0 ~ 30 millimeter, density are less than 800kg/m3) of ordinary boiler not suitable for simple compression for the problem of fuel to and current corner tube boiler can not realize that the layer fires and the fluidization combines together, thereby leads to the burning insufficient, the inhomogeneous problem of cloth wind.
In order to realize the purpose, the utility model discloses a technical scheme is: a low-speed fluidized bed type corner tube boiler comprises a boiler body, a feeding mechanism, a primary air distribution device and a secondary air distribution device, wherein the boiler body is a single-drum transverse corner tube boiler and comprises a combustion chamber; the feeding mechanism is communicated with the combustion chamber; the lower part of the combustion chamber is a low-speed fluidized bed, a flag type inclined buried pipe is arranged in the low-speed fluidized bed, the flag type inclined buried pipe divides the combustion chamber into a dense-phase area and a dilute-phase area, the area below the flag type inclined buried pipe is the dense-phase area, and the area above the flag type inclined buried pipe is the dilute-phase area; the primary air distribution device is connected with the lower part of the low-speed fluidized bed; the secondary air distribution device comprises a nozzle; the nozzle is disposed within the combustion chamber.
The area of the cross section of the hearth of the dilute phase zone of the combustion chamber is more than three times that of the cross section of the hearth of the dense phase zone of the combustion chamber.
The nozzle of the secondary air distribution device is arranged at the upper part of the combustion chamber, and the secondary air distribution device is a tangential air distribution device.
The secondary air distribution device comprises three layers, and each layer comprises eight nozzles; the eight nozzles are arranged on the inner wall of the combustion chamber and located in the same cross section plane, the eight nozzles are divided into two groups, the four nozzles are in one group, the symmetric center point of each group is located outside the axis of each nozzle, the distance from the symmetric center point to the axis of each nozzle is equal, the air outlet directions of the four nozzles are sequentially arranged clockwise or anticlockwise to form a group of tangential air distribution devices, and the tangential air distribution directions of each group are consistent.
The tube clearance D of the flag type inclined buried tube is 20 mm.
The low-speed fluidized bed is a low-speed fluidized bed with a small-hole blast cap.
Other structural components of the boiler body-single-drum horizontal type corner tube boiler are in the prior art, and refer to the structure disclosed in CN 201396743-a corner tube type circulating fluidized bed boiler.
Through the above design scheme, the utility model discloses following beneficial effect can be brought:
1. the straw particles (the granularity is 0-30 mm, the density is less than 800kg/m3) which are simply compressed can be combusted, the cost is reduced, and good economic benefit is obtained.
2. Through set up flag formula inclined buried pipe in low-speed fluidized bed to the pipe clearance realizes that the layer fires and fluidization combine together for 20mm, reaches the abundant effect of burning.
3. By adopting the low-speed fluidized bed, the cross section area of the dilute phase area of the combustion chamber is more than three times of that of the dense phase area, the height of the combustion chamber is increased, and tangential air distribution is arranged, so that the effects of uniform air distribution and more sufficient combustion are achieved.
4. The furnace does not need to additionally add bed materials, reduces the abrasion to each heating surface to the maximum extent, and effectively prolongs the service life.
Drawings
Fig. 1 is a front view of a low-speed fluidized bed type corner tube boiler according to the present invention.
FIG. 2 is a sectional view taken along the line A-A of the low-speed fluidized bed type corner tube boiler of the present invention.
FIG. 3 is a B-B sectional view of a low-speed fluidized bed type corner tube boiler of the present invention.
Fig. 4 is a plan view of the nozzle position of the secondary air distribution device.
FIG. 5 is a front view of a flag-type slant buried pipe in a low velocity fluidized bed.
FIG. 6 is a side view of a flag-type slant buried pipe in a low velocity fluidized bed.
In the figure, 1-a boiler body, 2-a feeding mechanism, 3-a combustion chamber, 4-flag type inclined buried pipes, 5-nozzles, an A-dense phase zone, a B-dilute phase zone, H-combustion chamber height and D-flag type inclined buried pipe gaps.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
It should be noted that, the terms "front and back, up and down, left and right" and the like in the text are only simplified terms for visually describing the positional relationship based on the drawings, and do not limit the technical solution.
Shown in figures 1-6: a low-speed fluidized bed type corner tube boiler comprises a boiler body 1, a feeding mechanism 2, a primary air distribution device and a secondary air distribution device, wherein the boiler body 1 is a single-drum horizontal corner tube boiler, and a combustion chamber 3 is arranged in the boiler body 1; the feeding mechanism 2 is communicated with the combustion chamber 3; the lower part of the combustion chamber 3 is a low-speed fluidized bed, and a flag type inclined buried pipe 4 is arranged in the low-speed fluidized bed; the flag-type inclined buried pipe 4 divides the combustion chamber into a dense-phase area A and a dilute-phase area B, the dense-phase area A is arranged in the lower area of the flag-type inclined buried pipe 4, and the dilute-phase area B is arranged in the upper area of the flag-type inclined buried pipe 4; the primary air distribution device is connected with the lower part of the low-speed fluidized bed; the secondary air distribution device comprises a nozzle 5; the nozzle 5 is arranged in the combustion chamber 3.
The area of the cross section of the hearth of the combustion chamber dilute phase zone B is more than three times that of the cross section of the hearth of the combustion chamber dense phase zone A.
The height H of the combustion chamber 3 is 1.3 times of the height of the combustion chamber of the grate-fired boiler with the same rated parameters; the rated parameters comprise a pressure value, a force output value and the like, and the height of a hearth of the fluidized bed boiler is one point three times of that of the grate firing boiler under the condition of the same heat supply load by taking a hot water boiler as an example. For example a 58 mw hot water boiler, the hearth height of the grate-fired boiler is 11600 mm. The height of the fluidized bed boiler was 15000 mm. And a nozzle (5) of the secondary air distribution device is arranged at the upper part of the combustion chamber 3, and the secondary air distribution device is a tangential air distribution device.
The secondary air distribution device comprises three layers, and each layer comprises eight nozzles 5; the eight nozzles 5 are arranged on the inner wall of the combustion chamber 3 and are positioned in the same cross section plane, the eight nozzles 5 are divided into two groups, four nozzles are in one group, the symmetrical center point of each group is arranged outside the axis of each nozzle, the distance from the symmetrical center point to the axis of each nozzle is equal, the air outlet directions of the four nozzles are sequentially arranged clockwise or anticlockwise to form a group of tangential air distribution devices, and the tangential air distribution directions of each group are consistent.
The tube clearance D of the flag type inclined buried tube 4 is 20 mm.
The low-speed fluidized bed is a low-speed fluidized bed with a small-hole blast cap.
The specific fuel, namely simply compressed straw particles (with the granularity of 0-30 mm and the density of less than 800kg/m3) is fed into the middle flag type inclined buried pipe from the front part of the boiler through the feeding system 2, so that large particles are retained on the inclined buried pipe, small particles and particles after large particles are cracked during combustion fall onto the air distribution plate, and the particles are naturally combusted in a layered mode, so that the large particles can be dried and combusted on the inclined buried pipe, the fine particles are bubbled and fluidized in a bed by using small air volume, the elutriation is reduced, additional bed materials are not needed to be added into the boiler, the abrasion on each heating surface is reduced to the maximum extent, and the service life is effectively prolonged.
By adopting the low-speed fluidized bed and setting the cross section area of the dilute phase area B of the combustion chamber to be more than three times that of the dense phase area A, the speed of the flue gas entering the upper space is rapidly reduced, the height H of the combustion chamber is increased, and tangential air distribution is arranged, so that the flue gas generates rotational flow to increase the retention time of fuel particles, and the effects of uniform air distribution and more sufficient combustion are achieved.
The invention relates to a fly ash high-temperature separation technology adopted by a slag condenser pipe for furnace outlet rarefied, which comprises the following steps: fly ash internal circulation fluidization reburning device based on high temperature separation has patent number: 200610043133.2. 50% -60% of fly ash is separated at high temperature, the high-temperature fly ash impacts a slag condenser pipe to be separated, vertical flow along the slag condenser pipe and fins descends and is accumulated into fly ash particle clusters, the fly ash particle clusters flow back and descend along a space near the water cooling of a rear wall under the action of gravity, the descending fly ash particle clusters are dispersed under the action of airflow in the descending process, the dispersed fly ash particles are entrained by the airflow and rise again, circulation and reciprocation are carried out, the separated fly ash continuously realizes circulation fluidization and reburning in a hearth, the descending flow of the furnace wall is matched, the combustible content in the fly ash is fully reduced, and the combustion efficiency is improved.
The boiler is of a frame structure, a boiler body is supported on a boiler base through four supporting points welded on lower headers of left and right side walls, a steering chamber is arranged at the top in a vertical shaft at the tail part of the boiler, three stages of flag-type convection heating surfaces are sequentially arranged at the lower part of the vertical shaft, and the flag-type convection heating surfaces adopt variable cross-section composite constant-flow-velocity design patents: the design method for compounding equal flow velocity of flag type convection heating surface of corner tube boiler is patent number: 200610043132.8, the heat transfer performance of the flag convection heating surface is prevented from being reduced, and the thermal efficiency of the boiler is prevented from being reduced along with time. Soot blowers are symmetrically arranged on the upper portion of the three-stage flag type convection heating surface, a soot receiving hopper is arranged in the bottom flue gas turning space, and accumulated soot on the three-stage flag type convection heating surface is discharged.
An independent tubular air preheater is arranged at the rear part of the boiler, and a fly ash separation device consisting of three rows of staggered inverted V-shaped elements is arranged at the preheater, and the patent number of an air preheating and dust remover integrated device is Z L01249093.8, so that the initial emission concentration of the boiler is further reduced, and the abrasion of fly ash to the inlet of the preheater is reduced.
Water circulation process
The system comprises a backwater collecting box, a boiler barrel, a buried pipe, water cooling walls (ascending) of front and rear walls of a hearth, water cooling walls (ascending) at two sides, the boiler barrel, a collecting box at the lower part of a rear wall channel of a vertical shaft, a three-stage flag type heating surface and a collecting box at an outlet of a furnace top.
Boiler smoke and air flow
The cold air secondary fan and the air preheater heat secondary air and the secondary air nozzle 5.
The device comprises a cold air primary fan, a low-speed fluidized bed, a dense-phase area A, a dilute-phase area B, a steering chamber, a three-stage flag type heating surface, an air preheater and flue gas exhaust.
It is obvious that the above-described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (6)
1. A low-speed fluidized bed type corner tube boiler is characterized by comprising a boiler body (1), a feeding mechanism (2), a primary air distribution device and a secondary air distribution device, wherein the boiler body (1) is a single-drum horizontal corner tube boiler, and a combustion chamber (3) is arranged in the boiler body (1); the feeding mechanism (2) is communicated with the combustion chamber (3); the lower part of the combustion chamber (3) is a low-speed fluidized bed, and a flag type inclined buried pipe (4) is arranged in the low-speed fluidized bed; the flag-type inclined buried pipe (4) divides the combustion chamber into a dense-phase area A and a dilute-phase area B, the dense-phase area A is arranged in the lower area of the flag-type inclined buried pipe (4), and the dilute-phase area B is arranged in the upper area of the flag-type inclined buried pipe (4); the primary air distribution device is connected with the lower part of the low-speed fluidized bed; the secondary air distribution device comprises a nozzle (5); the nozzle (5) is arranged in the combustion chamber (3).
2. A low-speed fluidized bed type corner tube boiler as defined in claim 1, characterized in that the cross-sectional area of the furnace in said combustion chamber dilute phase zone B is more than three times the cross-sectional area of the furnace in said combustion chamber dense phase zone A.
3. The low-speed fluidized bed type corner tube boiler according to claim 1, wherein the nozzle (5) of the secondary air distribution device is arranged at the upper part of the combustion chamber (3), and the secondary air distribution device is a tangential air distribution device.
4. A low-speed fluidized bed type corner tube boiler according to claim 3, characterized in that said secondary air distribution device has three layers, each layer comprising eight nozzles (5); the eight nozzles (5) are arranged on the inner wall of the combustion chamber (3) and located in the same cross section plane, the eight nozzles (5) are divided into two groups, the four nozzles are one group, the symmetric center point of each group is arranged outside the axis of each nozzle, the distance from the symmetric center point of each group to the axis of each nozzle is equal, the air outlet directions of the four nozzles are sequentially arranged clockwise or anticlockwise to form a group of tangential air distribution devices, and the tangential air distribution directions of each group are consistent.
5. A low-speed fluidized bed type corner tube boiler according to claim 1, characterized in that the tube clearance D of the flag-type inclined buried tube (4) is 20 mm.
6. A low-speed fluidized bed type corner tube boiler according to claim 1, wherein the low-speed fluidized bed is a low-speed fluidized bed with a small-hole hood.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921681804.7U CN211204034U (en) | 2019-10-10 | 2019-10-10 | Low-speed fluidized bed type corner tube boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921681804.7U CN211204034U (en) | 2019-10-10 | 2019-10-10 | Low-speed fluidized bed type corner tube boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211204034U true CN211204034U (en) | 2020-08-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921681804.7U Expired - Fee Related CN211204034U (en) | 2019-10-10 | 2019-10-10 | Low-speed fluidized bed type corner tube boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211204034U (en) |
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2019
- 2019-10-10 CN CN201921681804.7U patent/CN211204034U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200807 Termination date: 20211010 |
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| CF01 | Termination of patent right due to non-payment of annual fee |