CN106152113B - A kind of flue gas recirculation system of coal-powder boiler - Google Patents
A kind of flue gas recirculation system of coal-powder boiler Download PDFInfo
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- CN106152113B CN106152113B CN201510210550.0A CN201510210550A CN106152113B CN 106152113 B CN106152113 B CN 106152113B CN 201510210550 A CN201510210550 A CN 201510210550A CN 106152113 B CN106152113 B CN 106152113B
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- flue gas
- gas recirculation
- pipe
- furnace
- coil pipe
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Abstract
The present invention relates to a kind of flue gas recirculation systems of coal-powder boiler, for recycling the low-temperature flue gas after exchanging heat, adiabatic furnace (5) and exhaust pass (7) are equipped in the coal-powder boiler, the low-temperature flue gas is discharged from exhaust pass (7), the recirculating system includes flue gas recirculation pipe (1), the recirculation blower (8) being arranged on flue gas recirculation pipe (1), and coil pipe (9), one end connection outlet flue (7) of the flue gas recirculation pipe (1), the other end connects coil pipe (9), the coil pipe (9) connects adiabatic furnace (5)；Low-temperature flue gas in exhaust pass (7) enters flue gas recirculation pipe (1), and recycled blower (8) is delivered to coil pipe (9), is then re-fed into adiabatic furnace (5).Compared with prior art, the present invention is effectively reduced fire box temperature, places dry bottom hopper coking, reduces NOxThe advantages that concentration of emission.
Description
Technical field
The present invention relates to a kind of flue gas recirculation systems, more particularly, to a kind of flue gas recirculation system of coal-powder boiler.
Background technique
Currently, incinerator generally uses coal-powder boiler, coal-powder boiler is in burning, it will usually First air and Secondary Air be arranged to protect
Demonstrate,prove the full combustion of coal dust, wherein coal dust is conveyed by First air enters burner hearth through burner, and Secondary Air is secondary by burner
Wind annular passage or overfiren air port introduce burner hearth.Coal-powder boiler can generate a large amount of ash in burning, and a portion is emitted into furnace
Cooling in the dry bottom hopper of thorax lower part to become lime-ash discharge, another part becomes flying dust through flue gas conveying and is discharged by exhanst gas outlet.Cause
To contain a large amount of nitrogen substance in coal dust, coal-powder boiler can generate a large amount of NO in burningx, can be to ring by exhanst gas outlet discharge
Border pollutes, in addition, the excessively high dry bottom hopper coking for also resulting in lower furnace portion of the fire box temperature in coal-powder boiler, to be unfavorable for
The discharge of lime-ash etc..
Chinese patent ZL200920301966.3 discloses a kind of boiler flue gas recirculation device, including furnace body, chain-type
It is fire grate, bellows, Bunker, slag notch, burner hearth, flue, air preheater, smoking air-introduced machine, pressure fan, secondary air fan, primary
Air duct and secondary air duct；Chain furnace grate is mounted on the fire-grating frame of furnace body, and bellows, which are mounted on fire-grating frame, is placed in chain-type
In the inner cavity of fire grate, there is Bunker on the furnace body of the upper front end of corresponding chain furnace grate, the rear end of corresponding chain furnace grate
There is slag notch on the furnace body of lower section, the top of chain furnace grate is burner hearth, and the smoke outlet of burner hearth is connected with the import of flue.It should
The boiler flue gas recirculation device of patent improves efficiency of combustion, reduces the discharge of pernicious gas, but the burner hearth in boiler
Temperature is still excessively high, so that the easily coking of the dry bottom hopper of lower furnace portion.
Summary of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of flue gases of coal-powder boiler
Recirculating system.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of flue gas recirculation system of coal-powder boiler, for recycling the low-temperature flue gas after exchanging heat, the coal-powder boiler
In be equipped with adiabatic furnace and exhaust pass, the low-temperature flue gas from exhaust pass be discharged, the recirculating system includes cigarette
Gas recirculation pipe, the recirculation blower and coil pipe being arranged on flue gas recirculation pipe, one end of the flue gas recirculation pipe
Connection outlet flue, the other end connect coil pipe, which connects adiabatic furnace；Low-temperature flue gas in exhaust pass enters cigarette
Gas recirculation pipe, recycled blower are delivered to coil pipe, are then re-fed into adiabatic furnace, with the high-temperature flue gas in adiabatic furnace
Mixing changes the ratio of the caloric receptivity of Boiler radiation and convection heating surface, effectively reduces the Radiant exothermicity of burner hearth.
The adiabatic furnace is to surround the cavity formed by furnace wall, in the furnace wall inside of the adiabatic furnace lower part
Sky, forms the furnace chamber to match with the structure size of coil pipe, and the coil pipe is arranged in the furnace chamber to avoid in adiabatic furnace
Direct radiation of the high-temperature flue gas to coil pipe, effectively protect coil pipe.
The top of the coil pipe is equipped with outlet spouts, which connects adiabatic furnace.
The diameter of the coil pipe is 89~100mm, which is made of high temperature resistant stainless steel pipe,.
The material of the high temperature resistant stainless steel pipe is Cr25Ni20.
Air channel barrier is equipped in the flue gas recirculation pipe, which is located at the gas inlet of flue gas recirculation pipe
Between recirculation blower, to control the flue gas flow in flue gas recirculation pipe.
Compared with prior art, the low-temperature flue gas after exchanging heat at exhaust pass is passed sequentially through flue gas and followed again by the present invention
Endless tube and coil pipe are sent into the adiabatic furnace of coal-powder boiler, change the ratio of the caloric receptivity of Boiler radiation and convection heating surface, have
The Radiant exothermicity for reducing burner hearth of effect, moreover, being substantially reduced by the way that coil pipe is arranged in the furnace wall of the lower part of adiabatic furnace
The temperature of dry bottom hopper part in burner hearth, prevents dry bottom hopper coking, in addition, the recycling of low-temperature flue gas also reduces heat insulation furnace
Oxygen concentration in thorax, thereby reduces NOxGeneration and discharge, avoid environmental pollution.
Detailed description of the invention
Fig. 1 is mounting structure schematic diagram of the invention；
Fig. 2 is positive structure diagram of the invention；
In figure, flue gas recirculation pipe 1, outlet nozzle 2, air channel barrier 3, burner 4, adiabatic furnace 5, economizer 6, outlet
Flue 7, recirculation blower 8, coil pipe 9.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Fig. 2, a kind of flue gas recirculation system of coal-powder boiler, for recycling the low-temperature flue gas after exchanging heat, institute
Burner 4, adiabatic furnace 5, economizer 6 and exhaust pass 7 are equipped in the coal-powder boiler stated, as shown in Figure 1, in the work of burner 4
Under, coal dust burns in adiabatic furnace 5 generates high-temperature flue gas, becomes low-temperature flue gas after high-temperature flue gas and the heat exchange of economizer 6, so
It is discharged afterwards from exhaust pass 7, the recirculating system includes flue gas recirculation pipe 1, is arranged on flue gas recirculation pipe 1 again
Circulating fan 8 and coil pipe 9, one end connection outlet flue 7 of flue gas recirculation pipe 1, the other end connect the bottom of coil pipe 9, disk
The top of pipe 9 is equipped with outlet nozzle 2, and outlet nozzle 2 and adiabatic furnace 5 are connected, and air channel barrier 3 is equipped in flue gas recirculation pipe 1,
To control the flue gas flow in flue gas recirculation pipe 1, adiabatic furnace 5, around being formed, is located at 5 lower part of adiabatic furnace by furnace wall
Furnace wall inner hollow, form the furnace chamber to match with the structure size of coil pipe 9, the coil pipe 9 is arranged in the furnace chamber, disk
Pipe 9 is made of material of Cr25Ni20 high temperature resistant stainless steel pipe, a diameter of 89mm.
Embodiment 2
As shown in Fig. 2, a kind of flue gas recirculation system of coal-powder boiler, for recycling the low-temperature flue gas after exchanging heat, institute
Burner 4, adiabatic furnace 5, economizer 6 and exhaust pass 7 are equipped in the coal-powder boiler stated, as shown in Figure 1, in the work of burner 4
Under, coal dust burns in adiabatic furnace 5 generates high-temperature flue gas, becomes low-temperature flue gas after high-temperature flue gas and the heat exchange of economizer 6, so
It is discharged afterwards from exhaust pass 7, the recirculating system includes flue gas recirculation pipe 1, is arranged on flue gas recirculation pipe 1 again
Circulating fan 8 and coil pipe 9, one end connection outlet flue 7 of flue gas recirculation pipe 1, the other end connect the bottom of coil pipe 9, disk
The top of pipe 9 is equipped with outlet nozzle 2, and outlet nozzle 2 and adiabatic furnace 5 are connected, and air channel barrier 3 is equipped in flue gas recirculation pipe 1,
To control the flue gas flow in flue gas recirculation pipe 1, adiabatic furnace 5, around being formed, is located at 5 lower part of adiabatic furnace by furnace wall
Furnace wall inner hollow, form the furnace chamber to match with the structure size of coil pipe 9, the coil pipe 9 is arranged in the furnace chamber, disk
Pipe 9 is made of material of Cr25Ni20 high temperature resistant stainless steel pipe, a diameter of 100mm.
Embodiment 3
As shown in Fig. 2, a kind of flue gas recirculation system of coal-powder boiler, for recycling the low-temperature flue gas after exchanging heat, institute
Burner 4, adiabatic furnace 5, economizer 6 and exhaust pass 7 are equipped in the coal-powder boiler stated, as shown in Figure 1, in the work of burner 4
Under, coal dust burns in adiabatic furnace 5 generates high-temperature flue gas, becomes low-temperature flue gas after high-temperature flue gas and the heat exchange of economizer 6, so
It is discharged afterwards from exhaust pass 7, the recirculating system includes flue gas recirculation pipe 1, is arranged on flue gas recirculation pipe 1 again
Circulating fan 8 and coil pipe 9, one end connection outlet flue 7 of flue gas recirculation pipe 1, the other end connect the bottom of coil pipe 9, disk
The top of pipe 9 is equipped with outlet nozzle 2, and outlet nozzle 2 and adiabatic furnace 5 are connected, and air channel barrier 3 is equipped in flue gas recirculation pipe 1,
To control the flue gas flow in flue gas recirculation pipe 1, adiabatic furnace 5, around being formed, is located at 5 lower part of adiabatic furnace by furnace wall
Furnace wall inner hollow, form the furnace chamber to match with the structure size of coil pipe 9, the coil pipe 9 is arranged in the furnace chamber, disk
Pipe 9 is made of material of Cr25Ni20 high temperature resistant stainless steel pipe, a diameter of 80mm.
Flue gas recirculation system of the invention will low-temperature flue gas recycling be sent into adiabatic furnace in, change Boiler radiation with it is right
The ratio for flowing the caloric receptivity of heating surface, effectively reduces the Radiant exothermicity of burner hearth, moreover, by the lower part of adiabatic furnace
Furnace wall in be arranged coil pipe, substantially reduce the temperature of dry bottom hopper part in burner hearth, prevent dry bottom hopper coking, in addition, low-temperature flue gas
Recycling also reduce the oxygen concentration in adiabatic furnace, thereby reduce NOxGeneration and discharge, avoid environment
Pollution.
Claims (3)
1. a kind of flue gas recirculation system of coal-powder boiler, for recycling the low-temperature flue gas after heat exchange, in the coal-powder boiler
Equipped with adiabatic furnace (5) and exhaust pass (7), the low-temperature flue gas is discharged from exhaust pass (7), which is characterized in that described
Recirculating system include flue gas recirculation pipe (1), recirculation blower (8) on flue gas recirculation pipe (1), Yi Jipan be set
It manages (9), one end connection outlet flue (7) of the flue gas recirculation pipe (1), the other end connects coil pipe (9), the coil pipe (9)
It connects adiabatic furnace (5)；Low-temperature flue gas in exhaust pass (7) enters flue gas recirculation pipe (1), recycled blower
(8) coil pipe (9) are delivered to, are then re-fed into adiabatic furnace (5)；
The adiabatic furnace (5) is to surround the cavity formed by furnace wall, is located in the furnace wall inside of adiabatic furnace (5) lower part
Sky, forms the furnace chamber to match with the structure size of coil pipe (9), and the coil pipe (9) is arranged in the furnace chamber；
The top of the coil pipe (9) is equipped with outlet spouts (2), which connects adiabatic furnace (5)；
The diameter of the coil pipe (9) is 80~100mm, which is made of high temperature resistant stainless steel pipe.
2. a kind of flue gas recirculation system of coal-powder boiler according to claim 1, which is characterized in that the high temperature resistant is not
The material of rust steel pipe is Cr25Ni20.
3. a kind of flue gas recirculation system of coal-powder boiler according to claim 1, which is characterized in that the flue gas follows again
Air channel barrier (3) are equipped in endless tube (1), which is located at the gas inlet and reduced air of flue gas recirculation pipe (1)
Between machine (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510210550.0A CN106152113B (en) | 2015-04-28 | 2015-04-28 | A kind of flue gas recirculation system of coal-powder boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510210550.0A CN106152113B (en) | 2015-04-28 | 2015-04-28 | A kind of flue gas recirculation system of coal-powder boiler |
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| Publication Number | Publication Date |
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| CN106152113A CN106152113A (en) | 2016-11-23 |
| CN106152113B true CN106152113B (en) | 2019-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510210550.0A Active CN106152113B (en) | 2015-04-28 | 2015-04-28 | A kind of flue gas recirculation system of coal-powder boiler |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108253402A (en) * | 2018-01-19 | 2018-07-06 | 上海工业锅炉有限公司 | A kind of lower part coil pipe for industrial coal powder boiler of organic heat carrier |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB938470A (en) * | 1959-01-20 | 1963-10-02 | Superheater Co Ltd | Improvements in steam generating installation |
| US4136643A (en) * | 1977-08-15 | 1979-01-30 | Sulzer Brothers Limited | Waste heat steam generator |
| CN2676041Y (en) * | 2003-12-25 | 2005-02-02 | 乐长义 | Hypothermal gas recirculation equipment for boiler of large capacity power station |
| CN102620309A (en) * | 2012-04-10 | 2012-08-01 | 无锡华光锅炉股份有限公司 | Bottom air distribution structure of boiler |
| CN204127939U (en) * | 2014-09-03 | 2015-01-28 | 上海汉鼎环保技术工程有限公司 | With the steam generator system of cold flue gas recirculation |
| CN204593370U (en) * | 2015-04-28 | 2015-08-26 | 上海工业锅炉有限公司 | A kind of flue gas recirculation system of coal-powder boiler |
-
2015
- 2015-04-28 CN CN201510210550.0A patent/CN106152113B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB938470A (en) * | 1959-01-20 | 1963-10-02 | Superheater Co Ltd | Improvements in steam generating installation |
| US4136643A (en) * | 1977-08-15 | 1979-01-30 | Sulzer Brothers Limited | Waste heat steam generator |
| CN2676041Y (en) * | 2003-12-25 | 2005-02-02 | 乐长义 | Hypothermal gas recirculation equipment for boiler of large capacity power station |
| CN102620309A (en) * | 2012-04-10 | 2012-08-01 | 无锡华光锅炉股份有限公司 | Bottom air distribution structure of boiler |
| CN204127939U (en) * | 2014-09-03 | 2015-01-28 | 上海汉鼎环保技术工程有限公司 | With the steam generator system of cold flue gas recirculation |
| CN204593370U (en) * | 2015-04-28 | 2015-08-26 | 上海工业锅炉有限公司 | A kind of flue gas recirculation system of coal-powder boiler |
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| CN106152113A (en) | 2016-11-23 |
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Effective date of registration: 20210514 Address after: No. 101, Antai 1st Road, Xishan Economic and Technological Development Zone, Wuxi City, Jiangsu Province Patentee after: SHANGHAI INDUSTRIAL BOILER (WUXI) Co.,Ltd. Address before: 201501 No.15, 17, 19, Lane 285, Tiangong Road, Jinshan Industrial Zone, Jinshan District, Shanghai Patentee before: SHANGHAI INDUSTRIAL BOILER Ltd. |