CN203703956U - Middle air combustion chamber of circulating fluidized bed boiler - Google Patents

Middle air combustion chamber of circulating fluidized bed boiler Download PDF

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Publication number
CN203703956U
CN203703956U CN201320860491.8U CN201320860491U CN203703956U CN 203703956 U CN203703956 U CN 203703956U CN 201320860491 U CN201320860491 U CN 201320860491U CN 203703956 U CN203703956 U CN 203703956U
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CN
China
Prior art keywords
air
wind
boiler
airduct
combustion chamber
Prior art date
Application number
CN201320860491.8U
Other languages
Chinese (zh)
Inventor
张全胜
安洋
李勇
Original Assignee
北京兴侨国际工程技术有限公司
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Filing date
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Application filed by 北京兴侨国际工程技术有限公司 filed Critical 北京兴侨国际工程技术有限公司
Priority to CN201320860491.8U priority Critical patent/CN203703956U/en
Application granted granted Critical
Publication of CN203703956U publication Critical patent/CN203703956U/en

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Abstract

The utility model discloses a middle air combustion chamber of a circulating fluidized bed boiler. The middle air combustion chamber comprises a combustion chamber, a middle air pipe, a main primary air box of the boiler, a secondary air box, an air door for removing middle air from secondary air, an air door for removing middle air from primary air, an air pipe for removing middle air from primary air, a middle primary air box, and a mother pipe for removing middle air from primary air. The middle air combustion chamber is characterized in that the middle air pipe is arranged in the middle of the combustion chamber, and about 15 middle air pipes of the boiler are arranged, and about 15 holes are formed on a boiler wall accordingly; one part of original total air volume of the existing circulating fluidized bed boiler is introduced into the middle part of the boiler by the main primary air box of the boiler, the mother pipe for removing middle air from primary air, the middle primary air box, the air pipe for removing middle air from primary air, the air door for removing middle air from primary air and the middle air pipe; one part of the original total air volume of the existing circulating fluidized bed boiler is introduced into the middle part of the boiler through the secondary air box, the air door for removing middle air from secondary air and the middle air pipe.

Description

A kind of CFBB middle part wind furnace thorax
Technical field
The utility model relates to CFBB, especially relates to a kind of CFBB middle part wind furnace thorax.
Background technology
China is used the maximum country of CFBB (being called for short CFB boiler) in power plant in the world, the large and small cycles fluidized-bed combustion boiler having moved has more than 3000, wherein the above large-size circulating fluidized bed station boiler of 410t/h has more than 140, and the above large-size circulating fluidized bed station boiler of 1025t/h has more than 100 (also having more than 100 builds).
Circulating fluidized bed boiler of power station has been put layer 2-3 at the front furnace wall of lower furnace portion cone water-cooling wall and rear furnace wall and wing furnace wall paper and has been amounted to tens secondary air channels (pipe), Secondary Air is to provide oxygen and improves the after-flame degree of coal particle for overheavy firing, and the design idea of multilayer Secondary Air is that to want to realize multilayer air feed multilayer combustion be fractional combustion; Thereby the object of fractional combustion is to control the growing amount of nitrogen oxide in the combustion zone control oxygen making amount regional anoxic that makes to burn.Boiler hearth of circulating fluidized bed top is cylinder, 20 meters to 30 meters of height, and coal particle is along the burning while moving upward of time height, coal particle movement velocity 5m/s left and right.The feature of burning in circulating fluid bed boiler is then burning in the air of Bed Ignites, and coal particle aloft burns while moving along the furnace height of more than 20 meters, there is no obvious combustion centre.
Because existing orlop secondary air channel approaches the bed bed of material of boiling that pressure is larger, it is the higher bed bed of material that is difficult to penetrate boiling of orlop Secondary Air back pressure, do not play the after-flame degree that overheavy firing does not improve coal particle yet, be difficult to realize because the too close bed bed of material makes lower furnace portion oxygen enrichment on the contrary the growing amount of controlling nitrogen oxide; Existing CFBB layer 2-3 Secondary Air amounts to tens intensive layouts of secondary air channel does not realize fractional combustion and cannot reduce the growing amount of nitrogen oxide, and the discharged nitrous oxides concentration in flue gas is difficult to reach environmental protection standard requirement.
Must be out of service by existing atmosphere environmental protection policy boiler smoke emission boiler not up to standard.
So, be necessary to improve and realize fractional combustion on wind distributes, significantly reduce the nitrogen oxide of boiler smoke discharge, carry out a kind of CFBB middle part wind furnace thorax.
Summary of the invention
The utility model object is to provide a kind of CFBB middle part wind furnace thorax, middle part wind and lower furnace portion multilayer Secondary Air pull open certain distance in short transverse, realizing layering air feed stratified combustion is fractional combustion, the nitrous oxides concentration that can reduce boiler smoke discharge, reaches environmental protection standard requirement.Middle part wind is the wind of the most backward burner hearth delivering oxygen, also plays after-flame effect.
For achieving the above object, the utility model is taked following technical proposals:
A kind of CFBB described in the utility model middle part wind furnace thorax, it comprises that burner hearth, middle part airduct, boiler total bellows, secondary air box, a Secondary Air go middle part wind air door ,-inferior wind to go middle part wind air door, a wind to go middle part wind airduct, No. one time, middle part bellows, a wind to remove the female pipe of middle part wind, is characterized in that: at burner hearth middle part, middle part airduct is set.
A kind of CFBB described in the utility model middle part wind furnace thorax technical characterstic has:
1. go the female pipe of middle part wind, No. one time, middle part bellows, a wind to go middle part wind airduct, a wind to go middle part wind air door and middle part airduct to introduce boiler middle part by the total bellows of boiler, a wind part for the former total blast volume of existing fluidized-bed combustion boiler.
2. go middle part wind air door and middle part airduct to introduce boiler middle part by secondary air box, Secondary Air a part for the former total blast volume of existing fluidized-bed combustion boiler.
3. wind arm in boiler middle part has 15, corresponding 15 of perforates on furnace wall.
Boiler middle part wind enters burner hearth by the perforate at furnace wall middle part, can play the after-flame degree of overheavy firing raising coal particle, also can play the effect that reduces the nitrous oxides concentration in boiler smoke.
Brief description of the drawings
Fig. 1 is existing circulating fluid bed boiler secondary air burner hearth diagram.
Fig. 2 is the utility model CFBB middle part wind furnace thorax diagram.
Detailed description of the invention
As shown in Figure 2, a kind of CFBB described in the utility model middle part wind furnace thorax, it comprises burner hearth 1, lower secondary air channel 2, upper secondary air channel 3, middle part airduct 4, air distribution plate 5, bed material 6, an air compartment 7, the total bellows 8 of boiler, secondary air box 9, Secondary Air removes middle part wind air door 10, one time wind removes middle part wind air door 11, one time wind removes middle part wind airduct 12, the bellows 13 in middle part, one time wind removes the female pipe 14 of middle part wind, a part for the former total blast volume of existing fluidized-bed combustion boiler is passed through to the total bellows 8 of boiler, one time wind removes the female pipe 14 of middle part wind, the bellows 13 in middle part, one time wind removes middle part wind airduct 12, one time wind goes middle part wind air door 11 and middle part airduct 4 to introduce boiler middle part, a part for the former total blast volume of existing fluidized-bed combustion boiler is passed through to secondary air box 9, Secondary Air goes middle part wind air door 10 and middle part airduct 4 to introduce boiler middle part, boiler middle part airduct 4 quantity have 15, corresponding 15 of perforates on furnace wall.
Boiler middle part wind enters burner hearth by the perforate at furnace wall middle part, can play the after-flame degree of overheavy firing raising coal particle, also can play the effect that reduces the nitrous oxides concentration in boiler smoke.
The various embodiments described above can not depart from some variations in addition under scope of the present utility model, thus above explanation comprises and accompanying drawing shown in structure should be considered as exemplary, but not in order to limit claim of the present utility model.

Claims (4)

1. a CFBB middle part wind furnace thorax, it comprises that burner hearth (1), middle part airduct (4), the total bellows of boiler (8), secondary air box (9), Secondary Air go middle part wind air door (10), a wind to go middle part wind air door (11), a wind to go middle part wind airduct (12), the bellows in middle part (13), a wind to remove the middle part female pipe of wind (14), is characterized in that: at burner hearth (1) middle part, middle part airduct (4) is set.
2. a kind of CFBB according to claim 1 middle part wind furnace thorax, is characterized in that: go the female pipe of middle part wind (14), the bellows in middle part (13), a wind to go middle part wind airduct (12), a wind to go middle part wind air door (11) and middle part airduct (4) to introduce boiler middle part by the total bellows of boiler (8), a wind part for the former total blast volume of existing fluidized-bed combustion boiler.
3. a kind of CFBB according to claim 1 middle part wind furnace thorax, is characterized in that: go middle part wind air door (10) and middle part airduct (4) to introduce boiler middle part by secondary air box (9), Secondary Air a part for the former total blast volume of existing fluidized-bed combustion boiler.
4. a kind of CFBB according to claim 1 middle part wind furnace thorax, is characterized in that: the quantity of boiler middle part airduct (4) has 15, corresponding 15 of perforates on furnace wall.
CN201320860491.8U 2013-12-25 2013-12-25 Middle air combustion chamber of circulating fluidized bed boiler CN203703956U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320860491.8U CN203703956U (en) 2013-12-25 2013-12-25 Middle air combustion chamber of circulating fluidized bed boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320860491.8U CN203703956U (en) 2013-12-25 2013-12-25 Middle air combustion chamber of circulating fluidized bed boiler

Publications (1)

Publication Number Publication Date
CN203703956U true CN203703956U (en) 2014-07-09

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CN201320860491.8U CN203703956U (en) 2013-12-25 2013-12-25 Middle air combustion chamber of circulating fluidized bed boiler

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106439794A (en) * 2016-09-30 2017-02-22 浙江浙能技术研究院有限公司 Air distribution method and system reducing NOX emission and relieving coking
CN106642083A (en) * 2016-09-30 2017-05-10 浙江浙能技术研究院有限公司 Side over fire air distribution method and coal-fired boiler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106439794A (en) * 2016-09-30 2017-02-22 浙江浙能技术研究院有限公司 Air distribution method and system reducing NOX emission and relieving coking
CN106642083A (en) * 2016-09-30 2017-05-10 浙江浙能技术研究院有限公司 Side over fire air distribution method and coal-fired boiler

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