CN210511759U - Secondary air supply system of bagasse boiler - Google Patents
Secondary air supply system of bagasse boiler Download PDFInfo
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- CN210511759U CN210511759U CN201921542024.4U CN201921542024U CN210511759U CN 210511759 U CN210511759 U CN 210511759U CN 201921542024 U CN201921542024 U CN 201921542024U CN 210511759 U CN210511759 U CN 210511759U
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Abstract
A secondary air supply system of a bagasse boiler comprises a rear secondary air supply device, a side-lower secondary air supply device and a side-upper secondary air supply device; the rear secondary air supply device comprises a rear air supply box, a rear air supply pipe and a rear air supply connecting pipe; the side lower secondary air supply device comprises a side lower air supply box, a side lower air supply pipe and a side lower air supply connecting pipe; the side upper secondary air supply device comprises a side upper air supply box, a side upper air supply pipe and a side upper air supply connecting pipe; the rear secondary air supply device is arranged outside the rear side furnace wall of the bagasse boiler and is communicated with the hearth through a rear air supply pipe; the lower secondary air supply devices are respectively arranged at the outer sides of the middle positions of the left side and the right side of the hearth and are communicated with the hearth through lower side supply pipes; the side secondary air supply devices are respectively arranged on the outer sides of the upper positions of the left side and the right side of the hearth and are communicated with the hearth through side supply air pipes. The system supplies oxygen to the hearth, so that the bagasse fuel is fully combusted, the discharge amount of tail gas pollutants is reduced, and the aims of energy conservation and emission reduction are fulfilled.
Description
Technical Field
The utility model relates to a technical field of boiler equipment specifically is a secondary air feed system of bagasse boiler.
Background
Bagasse is a waste product produced in the sugar production process, but is also a valuable fuel energy source. If the waste is directly discarded as industrial waste, the energy is wasted, and the environment is polluted; therefore, bagasse is used as a boiler fuel at present, so that steam generated by a boiler is used for power supply and steam supply, and finally, not only is energy reasonably utilized, but also the social environment is protected.
The bagasse boiler is a steam boiler using bagasse as fuel, the bagasse is light high-moisture fuel, the moisture of the bagasse is about 50%, and due to high moisture content, after the bagasse fuel enters the hearth, the heat absorption capacity is large, the temperature of an ignition region at the lower part of the hearth is low, the ignition and combustion of the bagasse are delayed, and a large amount of bagasse flies out of the hearth without being completely combusted. Because the bagasse is not completely combusted, the fly ash in the flue gas has high carbon content, the amount of the flue dust discharged by the boiler is large, a large amount of the flue dust is deposited on the heating surface at the tail part, and some sugar factories burn out the air preheater due to the sudden combustion of the large amount of the flue dust deposited on the air preheater, so that serious boiler shutdown accidents are caused.
The existing bagasse boiler generates a large amount of flue gas due to high moisture of fuel bagasse, the amount of flue gas in the atmosphere of a boiler is large, the heat loss of the boiler flue gas is large, and a boiler induced draft fan is loaded. And because the bagasse of the existing bagasse boiler is not completely combusted, energy is wasted, the steam production of the boiler and the operation cost of the boiler are influenced, and a large amount of soot is discharged, so that the environmental pollution is aggravated. Therefore, the aim of saving energy and reducing emission is the aim of pursuing by people in the industry by how to achieve the purpose of meeting the standard of the emission of the flue gas of the bagasse boiler.
Disclosure of Invention
The utility model aims at providing a secondary air feed system of bagasse boiler, this system make the combustion of bagasse fuel abundant for bagasse boiler furnace additional oxygen, reduce tail gas pollutant emission, reach energy saving and emission reduction's purpose.
A secondary air supply system of a bagasse boiler comprises a rear secondary air supply device, a side-lower secondary air supply device and a side-upper secondary air supply device; the rear secondary air supply device comprises a rear air supply box, a rear air supply pipe and a rear air supply connecting pipe, the rear air supply box is in a closed square shape, and the rear air supply connecting pipe is communicated with the middle of the bottom of the rear air supply box; the rear air supply pipes are uniformly distributed at the front part of the rear air supply box and are communicated with the rear air supply box, the rear air supply pipes are arranged in two rows at the front part of the rear air supply box, and every three adjacent rear air supply pipes are distributed in a delta shape; this arrangement allows better disturbance of the bagasse fuel.
The side lower secondary air supply device comprises a side lower air supply box, a side lower air supply pipe and a side lower air supply connecting pipe, wherein the side lower air supply box is in a sealed square shape, and the side lower air supply connecting pipe is communicated with the middle of the rear part of the side lower air supply box; the lower air supply pipes are uniformly distributed in the front of the lower side air supply box and communicated with the lower side air supply box, the lower side air supply pipes are arranged in a row at the front horizontal central line position of the lower side air supply box, the lower side air supply connecting pipes are symmetrical by taking the lower side air supply connecting pipes as symmetrical centers, and the front parts of the lower side air supply boxes corresponding to the lower side air supply connecting pipes are communicated with two lower side air supply pipes.
The side upper secondary air supply device comprises a side upper air supply box, a side upper air supply pipe and a side upper air supply connecting pipe, wherein the side upper air supply box is in a sealed square shape, and the side upper air supply connecting pipe is communicated with the middle of the rear part of the side upper air supply box; a plurality of side upper air supply pipes are uniformly distributed at the front part of the side upper air supply box and are communicated with the side upper air supply box, the plurality of side upper air supply pipes are arranged in a row at the front horizontal center line position of the side upper air supply box, the side upper air supply connecting pipes are symmetrical by taking the side upper air supply connecting pipes as symmetrical centers, and the front parts of the side upper air supply boxes corresponding to the side upper air supply connecting pipes are communicated with three side upper air supply pipes; the rear air supply connecting pipe, the side lower air supply connecting pipe and the side upper air supply connecting pipe are communicated with the air preheater through air conveying pipes and a fan. The air preheater adopts the existing mature boiler air preheater, adopts the heat of the boiler flue gas to heat the air, and then conveys the air into the hearth.
The rear secondary air supply device is arranged outside the furnace wall at the rear side of the grate of the bagasse boiler and is communicated with the hearth through a rear air supply pipe; the lower side secondary air supply devices are respectively arranged on the outer sides of the middle positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through lower side supply pipes; and the side secondary air supply devices are respectively arranged on the outer sides of the upper positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through side supply air pipes.
The rear air supply pipes are arranged in two rows at the front part of the rear air supply box and inclined downwards at an angle of 8 degrees with the horizontal plane; the rear air supply box is horizontally arranged, and the rear air supply pipe and the horizontal plane form an angle of 8 degrees and are inclined downwards, namely the angle of blowing air into the hearth. And the rear air supply pipes are arranged in two rows, wherein one row is arranged at the upper part of the horizontal center line of the rear air supply box, and the other row is arranged at the lower part of the horizontal center line of the rear air supply box, and the distances from the horizontal center line are equal. The horizontal distance between two adjacent rear blast pipes is 21 cm.
The side lower blast pipe and the side upper blast pipe are inclined downwards at an angle of 10 degrees with the horizontal plane; the side upper air supply box and the side lower air supply box are horizontally arranged, and the side lower air supply pipe and the side upper air supply pipe are inclined downwards at an angle of 10 degrees with the horizontal plane, namely the angle of blowing air into the hearth. The distance between two adjacent side lower air supply pipes on two sides of the side lower air supply connecting pipe is sequentially 20 cm, 30 cm and 20 cm; the distance between the two lateral lower air supply pipes at the front part of the lateral lower air supply connecting pipe is 40 cm. The distance between two adjacent side upper air supply pipes on two sides of the side upper air supply connecting pipe is sequentially 20 cm, 30 cm and 20 cm; the distance between three side air supply pipes at the front part of the side air supply connecting pipe is 20 cm.
The primary air is arranged below the grate, and the air quantity is distributed: the primary air accounts for 60%, the secondary air accounts for 8%, the secondary air accounts for 10% on the side, and the secondary air accounts for 15% under the side. The secondary air system is calculated as follows:
this bagasse boiler's secondary air feed system has following advantage:
1. the utility model has skillful structure arrangement, the secondary air intake devices are respectively arranged at the rear side of the fire grate and the middle part and the upper part of the furnace chamber, and the air intake devices at the rear side of the fire grate and the middle part of the furnace chamber can disturb the bagasse fuel, so that the bagasse fuel can be rolled and combusted; the secondary air inlet devices on two sides of the upper part of the hearth press back incompletely combusted fuel to be combusted again, so that the incompletely combusted fuel is not directly discharged, the bagasse fuel is fully combusted, the discharge amount of tail gas pollutants is reduced, the boiler efficiency is improved, the environmental pollution is reduced, and the purposes of energy conservation and emission reduction are achieved.
2. Because the two sides at the rear side of the fire grate and the middle part and the upper part of the hearth are respectively provided with the secondary air inlet devices, the temperature of the hearth can not be reduced too much after the conveyed secondary air is preheated, and because the structural arrangement is ingenious, the combustion of bagasse fuel is stable, the fuel combustion is full, the steam production is stable, and the steam production per ton of slag reaches more than 2.75 tons.
Drawings
FIG. 1 is a schematic layout of the secondary air supply system of the bagasse boiler;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a schematic structural view of the rear overfire air supply device of FIG. 1;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a left side view of FIG. 3;
FIG. 6 is an enlarged partial view of FIG. 5;
FIG. 7 is a schematic structural view of the lower side secondary air supply device in FIG. 1;
FIG. 8 is a top view of FIG. 7;
FIG. 9 is a left side view of FIG. 7;
FIG. 10 is an enlarged view of a portion of FIG. 7;
FIG. 11 is a schematic structural view of the secondary air supply device on the side of FIG. 1;
FIG. 12 is a top view of FIG. 11;
FIG. 13 is a left side view of FIG. 11;
FIG. 14 is an enlarged partial view of FIG. 7;
the part names of the sequence numbers in the figure are:
1. rear overgrate air supply device, 2, side lower overgrate air supply device, 3, side upper overgrate air supply device, 4, rear air supply box, 5, rear air supply pipe, 6, rear air supply connecting pipe, 7, side lower air supply box, 8, side lower air supply pipe, 9, side lower air supply connecting pipe, 10, side upper air supply box, 11, side upper air supply pipe, 12, side upper air supply connecting pipe.
Detailed Description
For a more clear description of the present technology, the present technology is further described in detail below with reference to the accompanying drawings and examples.
Example 1
A secondary air supply system of a bagasse boiler comprises a rear secondary air supply device 1, a side-lower secondary air supply device 2 and a side-upper secondary air supply device 3; the rear secondary air supply device 1 comprises a rear air supply box 4, a rear air supply pipe 5 and a rear air supply connecting pipe 6, the rear air supply box 4 is in a closed square shape, and the rear air supply connecting pipe 6 is communicated with the middle of the bottom of the rear air supply box 4; a plurality of rear air supply pipes 5 are uniformly distributed at the front part of the rear air supply box 4 and are communicated with the rear air supply box 4, the plurality of rear air supply pipes 5 are arranged in two rows at the front part of the rear air supply box 4, and every three adjacent rear air supply pipes 5 are distributed in a delta shape;
the side lower secondary air supply device 2 comprises a side lower air supply box 7, a side lower air supply pipe 8 and a side lower air supply connecting pipe 9, the side lower air supply box 7 is in a sealed square shape, and the side lower air supply connecting pipe 9 is communicated with the middle of the rear part of the side lower air supply box 7; a plurality of side lower air supply pipes 8 are uniformly distributed at the front part of the side lower air supply box 7 and are communicated with the side lower air supply box 7, the plurality of side lower air supply pipes 8 are arranged in a row at the front horizontal center line position of the side lower air supply box 7, the side lower air supply connecting pipes 9 are used as symmetrical centers, and the front parts of the side lower air supply boxes 7 corresponding to the side lower air supply connecting pipes 9 are communicated with two side lower air supply pipes 8;
the side upper secondary air supply device 3 comprises a side upper air supply box 10, a side upper air supply pipe 11 and a side upper air supply connecting pipe 12, wherein the side upper air supply box 10 is in a sealed square shape, and the side upper air supply connecting pipe 12 is communicated with the middle of the rear part of the side upper air supply box 10; a plurality of side upper air supply pipes 11 are uniformly distributed at the front part of the side upper air supply box 10 and are communicated with the side upper air supply box 10, the plurality of side upper air supply pipes 11 are arranged in a row at the front horizontal center line position of the side upper air supply box 10 and are symmetrical by taking the side upper air supply connecting pipe 12 as a symmetrical center, and the front part of the side upper air supply box 10 corresponding to the side upper air supply connecting pipe 12 is communicated with three side upper air supply pipes 11; the rear air supply connecting pipe 6, the side lower air supply connecting pipe 9 and the side upper air supply connecting pipe 12 are communicated with the air preheater through air conveying pipes and a fan;
the rear secondary air supply device 1 is arranged outside the rear side furnace wall of the bagasse boiler and is communicated with the hearth through a rear air supply pipe 5; the lower side secondary air supply devices 2 are respectively arranged on the outer sides of the middle positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through lower side supply pipes 8; and the side secondary air supply devices 3 are respectively arranged on the outer sides of the upper positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through side supply air pipes 11.
Example 2
A secondary air supply system of a bagasse boiler comprises a rear secondary air supply device 1, a side-lower secondary air supply device 2 and a side-upper secondary air supply device 3; the rear secondary air supply device 1 comprises a rear air supply box 4, a rear air supply pipe 5 and a rear air supply connecting pipe 6, the rear air supply box 4 is in a closed square shape, and the rear air supply connecting pipe 6 is communicated with the middle of the bottom of the rear air supply box 4; a plurality of rear air supply pipes 5 are uniformly distributed at the front part of the rear air supply box 4 and are communicated with the rear air supply box 4, the plurality of rear air supply pipes 5 are arranged in two rows at the front part of the rear air supply box 4, and every three adjacent rear air supply pipes 5 are distributed in a delta shape;
the side lower secondary air supply device 2 comprises a side lower air supply box 7, a side lower air supply pipe 8 and a side lower air supply connecting pipe 9, the side lower air supply box 7 is in a sealed square shape, and the side lower air supply connecting pipe 9 is communicated with the middle of the rear part of the side lower air supply box 7; a plurality of side lower air supply pipes 8 are uniformly distributed at the front part of the side lower air supply box 7 and are communicated with the side lower air supply box 7, the plurality of side lower air supply pipes 8 are arranged in a row at the front horizontal center line position of the side lower air supply box 7, the side lower air supply connecting pipes 9 are used as symmetrical centers, and the front parts of the side lower air supply boxes 7 corresponding to the side lower air supply connecting pipes 9 are communicated with two side lower air supply pipes 8;
the side upper secondary air supply device 3 comprises a side upper air supply box 10, a side upper air supply pipe 11 and a side upper air supply connecting pipe 12, wherein the side upper air supply box 10 is in a sealed square shape, and the side upper air supply connecting pipe 12 is communicated with the middle of the rear part of the side upper air supply box 10; a plurality of side upper air supply pipes 11 are uniformly distributed at the front part of the side upper air supply box 10 and are communicated with the side upper air supply box 10, the plurality of side upper air supply pipes 11 are arranged in a row at the front horizontal center line position of the side upper air supply box 10 and are symmetrical by taking the side upper air supply connecting pipe 12 as a symmetrical center, and the front part of the side upper air supply box 10 corresponding to the side upper air supply connecting pipe 12 is communicated with three side upper air supply pipes 11; the rear air supply connecting pipe 6, the side lower air supply connecting pipe 9 and the side upper air supply connecting pipe 12 are communicated with the air preheater through air conveying pipes and a fan;
the rear secondary air supply device 1 is arranged outside the rear side furnace wall of the bagasse boiler and is communicated with the hearth through a rear air supply pipe 5; the lower side secondary air supply devices 2 are respectively arranged on the outer sides of the middle positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through lower side supply pipes 8; and the side secondary air supply devices 3 are respectively arranged on the outer sides of the upper positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through side supply air pipes 11.
The rear air supply pipes 5 are arranged in two rows at the front part of the rear air supply box 4 and incline downwards at an angle of 8 degrees with the horizontal plane; the rear air supply box 4 is horizontally arranged, and the rear air supply pipe 5 and the horizontal plane form an angle of 8 degrees and are inclined downwards, namely the angle of blowing air into the hearth. And the rear air supply pipes 5 are arranged in two rows, wherein one row is arranged at the upper part of the horizontal center line of the rear air supply box 4, and the other row is arranged at the lower part of the horizontal center line of the rear air supply box 4 and has equal distance from the horizontal center line. The horizontal distance between two adjacent rear air supply pipes 5 is 21 cm.
The side lower blast pipe 8 and the side upper blast pipe 11 are inclined downwards at an angle of 10 degrees with the horizontal plane; the side upper air supply box 10 and the side lower air supply box 7 are horizontally arranged, and the side lower air supply pipe 8 and the side upper air supply pipe 11 form an angle of 10 degrees with the horizontal plane and are inclined downwards, namely the angle of blowing air into the hearth. The distance between two adjacent side lower air supply pipes 8 on two sides of the side lower air supply connecting pipe 9 is sequentially 20 cm, 30 cm and 20 cm; the distance between the two side lower blast pipes 8 at the front part of the side lower blast connecting pipe 9 is 40 cm. The distance between two adjacent side upper blast pipes 11 on two sides of the side upper blast connecting pipe 12 is 20 cm, 30 cm and 20 cm in sequence; the distance between three side upper blast pipes 11 in front of the side upper blast connecting pipe 12 is 20 cm.
Application examples
1. This overgrate air system is tried to install at some company in Guangxi, the 120 ton boiler of a certain sugar refinery in Thailand, and the air distribution is arranged in the below of grate to the air current: the primary air accounts for 60 percent, the secondary air accounts for 8 percent, the secondary air accounts for 10 percent on the side, and the secondary air accounts for 15 percent on the side, according to incomplete statistics, about 2.8 tons of steam can be produced by combusting 1 ton of bagasse, and the tail gas of the boiler completely accords with the tail gas emission standard of the boiler.
The above description is not intended to limit the present application, and the present application is not limited to the above examples, and those skilled in the art should understand that they can make various changes, modifications, additions and substitutions within the spirit and scope of the present application.
Claims (3)
1. The utility model provides a bagasse boiler's secondary air feed system which characterized in that: comprises a rear secondary air supply device (1), a side lower secondary air supply device (2) and a side upper secondary air supply device (3); the rear secondary air supply device (1) comprises a rear air supply box (4), a rear air supply pipe (5) and a rear air supply connecting pipe (6), the rear air supply box (4) is in a sealed square shape, and the rear air supply connecting pipe (6) is communicated with the middle of the bottom of the rear air supply box (4); a plurality of rear air supply pipes (5) are uniformly distributed at the front part of the rear air supply box (4) and are communicated with the rear air supply box (4), the plurality of rear air supply pipes (5) are arranged in two rows at the front part of the rear air supply box (4), and every three adjacent rear air supply pipes (5) are distributed in a shape of Chinese character 'pin';
the side lower secondary air supply device (2) comprises a side lower air supply box (7), a side lower air supply pipe (8) and a side lower air supply connecting pipe (9), the side lower air supply box (7) is in a sealed square shape, and the side lower air supply connecting pipe (9) is communicated with the middle of the rear part of the side lower air supply box (7); a plurality of side lower air supply pipes (8) are uniformly distributed at the front part of the side lower air supply box (7) and are communicated with the side lower air supply box (7), the plurality of side lower air supply pipes (8) are arranged in a row at the front horizontal center line position of the side lower air supply box (7), the side lower air supply connecting pipes (9) are taken as symmetrical centers, and the front parts of the side lower air supply boxes (7) corresponding to the side lower air supply connecting pipes (9) are communicated with two side lower air supply pipes (8);
the side upper secondary air supply device (3) comprises a side upper air supply box (10), a side upper air supply pipe (11) and a side upper air supply connecting pipe (12), the side upper air supply box (10) is in a sealed square shape, and the side upper air supply connecting pipe (12) is communicated with the middle of the rear part of the side upper air supply box (10); a plurality of side upper air supply pipes (11) are uniformly distributed at the front part of the side upper air supply box (10) and are communicated with the side upper air supply box (10), the plurality of side upper air supply pipes (11) are arranged in a row at the front horizontal center line position of the side upper air supply box (10), the side upper air supply connecting pipe (12) is taken as a symmetrical center, and the front part of the side upper air supply box (10) corresponding to the side upper air supply connecting pipe (12) is communicated with three side upper air supply pipes (11); the rear air supply connecting pipe (6), the side lower air supply connecting pipe (9) and the side upper air supply connecting pipe (12) are communicated with the air preheater through air conveying pipes and a fan;
the rear secondary air supply device (1) is arranged outside the rear side furnace wall of the bagasse boiler and is communicated with the hearth through a rear air supply pipe (5); the lower side secondary air supply devices (2) are respectively arranged on the outer sides of the middle positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through lower side supply pipes (8); the side secondary air blowing devices (3) are respectively arranged on the outer sides of the upper positions of the left side and the right side of the hearth of the bagasse boiler and are communicated with the hearth through side air supply pipes (11).
2. The secondary air supply system of the bagasse boiler according to claim 1, characterized in that: the rear air supply pipes (5) are arranged in two rows in the front of the rear air supply box (4) and inclined downwards at an angle of 8 degrees with the horizontal plane.
3. The secondary air supply system of the bagasse boiler according to claim 1, characterized in that: the side lower blast pipe (8) and the side upper blast pipe (11) are inclined downwards at an angle of 10 degrees with the horizontal plane.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921542024.4U CN210511759U (en) | 2019-09-17 | 2019-09-17 | Secondary air supply system of bagasse boiler |
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| CN201921542024.4U CN210511759U (en) | 2019-09-17 | 2019-09-17 | Secondary air supply system of bagasse boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486748A (en) * | 2019-09-17 | 2019-11-22 | 广西联源机械化工有限公司 | A kind of secondary air feed system of bagasse boiler |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486748A (en) * | 2019-09-17 | 2019-11-22 | 广西联源机械化工有限公司 | A kind of secondary air feed system of bagasse boiler |
| CN110486748B (en) * | 2019-09-17 | 2024-03-08 | 广西联源机械化工有限公司 | Secondary air supply system of bagasse boiler |
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