CN208952072U - A kind of flue gas recirculation device suitable for W flame boiler - Google Patents
A kind of flue gas recirculation device suitable for W flame boiler Download PDFInfo
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- CN208952072U CN208952072U CN201821547038.0U CN201821547038U CN208952072U CN 208952072 U CN208952072 U CN 208952072U CN 201821547038 U CN201821547038 U CN 201821547038U CN 208952072 U CN208952072 U CN 208952072U
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- flue gas
- gas
- duct
- secondary air
- boiler
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Abstract
The utility model discloses a kind of flue gas recirculation devices suitable for W flame boiler, including gas sampling probe, recirculation blower, recirculating gas duct and flue gas nozzle；Gas sampling probe one end is equipped with flue gas and takes smoke pipe, takes smoke pipe to be connected with the flue after boiler desulfurization by flue gas, and the other end is connected by recirculation blower with recirculating gas duct one end；The other end of recirculating gas duct is equipped with flue gas nozzle；Flue gas nozzle protrudes into boiler secondary air air duct, and spout direction flowed to Secondary Air it is perpendicular.The utility model is sent into burner hearth by mixing flue gas recycled with Secondary Air, can effectively avoid combustion zone ischaemia while reducing burner hearth entirety oxygen amount, reduce the influence to hearth combustion tissue.Simultaneously because separately opening up flue gas recirculation spout not on burner hearth, spout coking and blocking problem is not present.
Description
Technical field
The utility model relates to the low NO of W flame boilerXA kind of combustion technology, and in particular to cigarette suitable for W flame boiler
Gas recycling device belongs to electric power and power engineering technology field.
Background technique
W flame boiler is a kind of pot for being specifically intended for burning low volatile coal of Foster Wheeler company, U.S. exploitation
Furnace, it is with the obvious advantage when using the low volatiles coal such as anthracite and meager coal inferior.W flame boiler lower hearth is bigger than upper furnace
80%~120%, front and back furnace roof outstanding constitutes chimney arch, and coal nozzle sprays into downwards burner hearth on chimney arch, when coal dust gas
Stream flows downward when extending, and after lower furnace portion and Secondary Air are met, half-turn is flowed up, and forms " W " shape flame.To make
Coal dust catches fire in time, stablizes burning, after-flame, and W flame boiler is frequently with low wind speed, high coal powder density, Gao Fengwen and burner
The measures such as wall with refractory lining, refracto, but some measures and reduction NO are laid in regionxContradiction is produced, W flame boiler NO is causedxConcentration of emission is general
All over higher.
As what Environmental Protection in China required is increasingly stringenter, wanting for ultra-clean discharge is proposed to the coal-burning boiler of certain areas
It asks, and W flame boiler is due to its combustion characteristics, NOxConcentration of emission is generally in 1200mg/m3Left and right.Using conventional low NOx
After combustion technology and SCR gas denitrifying technology, NOxConcentration of emission is still in 200mg/m3Left and right, is extremely difficult to ultra-clean discharge and wants
It asks.It needs to further decrease NO using flue gas recirculation devicex.Existing flue gas recirculation device is straight after being pressurized cold flue gas
It connects and guides to lower hearth, spray into burner hearth in lower hearth arrangement smoke inlet.
But existing flue gas recirculation device has the disadvantage that
1) since flue gas recirculation amount is generally the 10% of exhaust gas volumn, amount is larger, lower hearth is injected directly into, to primary zone
Burning tissues have large effect；
2) lower hearth temperature is higher, when flue gas recirculation is stopped transport, the easy coking and blocking of spout；
3) oxygen amount is lower in flue gas, and temperature is lower, concentrates and sprays into burner hearth, causes burner hearth part oxygen amount too low, be unfavorable for coal
Powder after-flame.
Summary of the invention
Purpose of the utility model is to solve defect existing in the prior art, providing a kind of can effectively avoid burning
The flue gas recirculation method of region ischaemia.
In order to achieve the above object, the utility model provides a kind of flue gas recirculation device suitable for W flame boiler,
Including gas sampling probe, recirculation blower, recirculating gas duct and flue gas nozzle；Described gas sampling probe one end is equipped with flue gas and takes cigarette
Pipe, takes smoke pipe to be connected with the flue after boiler desulfurization by flue gas, and the other end passes through the recirculation blower and recirculating gas duct
One end is connected；The other end of the recirculating gas duct is equipped with flue gas nozzle；The flue gas nozzle protrudes into boiler secondary air air duct,
And spout direction flowed to Secondary Air it is perpendicular.
Further, flue gas spray nozzle front end is flaring.
Further, swirl vane is equipped in flue gas nozzle.
The utility model has the advantage that compared with prior art
1, the utility model is sent into burner hearth by mixing flue gas recycled with Secondary Air, can reduce burner hearth entirety oxygen amount
While, combustion zone ischaemia is effectively avoided, the influence to hearth combustion tissue is reduced.Simultaneously because not on burner hearth
Flue gas recirculation spout separately is opened up, spout coking and blocking problem is not present.
2, the utility model enters burner hearth by the way that flue gas is sprayed into secondary air passage after mixing, will not be to burner
Tissue has an adverse effect；
3, using Novel flue gas nozzle, be conducive to Secondary Air and mix with flue gas；
4, spout coking and blocking problem is not present when flue gas recirculation system shutdown, will not influence hearth combustion tissue.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model flue gas recirculation device；
Fig. 2 is the top view of flue gas recirculation device in Fig. 1；
Fig. 3 is the enlarged drawing of flue gas nozzle in Fig. 1.
In figure, 1- flue gas takes smoke pipe, 2- recirculation blower, 3- recirculating gas duct, 4- recirculating gas duct, 5- burner hearth, 6-
Flue gas nozzle, 7- secondary air passage, 6-1- swirl vane, 6-2- flaring.
Specific embodiment
Hereinafter reference will be made to the drawings 1,2,3, and the preferred embodiment of this patent is described in detail.Preferred embodiment is only
In order to illustrate this patent, rather than in order to limit the protection scope of this patent.
The utility model flue gas recirculation device is suitable for W flame boiler, takes smoke pipe 1, recirculation blower 2, again by flue gas
Cycle flue 3,4, the composition of flue gas nozzle 6.Flue gas takes 1 one end of smoke pipe to be equipped with flue gas smoke taking mouth, is arranged in by flue gas smoke taking mouth
On flue after boiler desulfurization.Recirculation blower 2 takes smoke pipe 1 to connect with flue gas.Flue gas nozzle 6 is arranged in boiler secondary air air duct
In 7, recirculating gas duct 4 is passed sequentially through, recirculating gas duct 3 is connected with recirculation blower 2.As shown in figure 3, flue gas nozzle 6 is by revolving
Flow blade 6-1 and flue gas flaring 6-2 composition.
After the recycled blower 2 of hypoxic cold flue gas from smoke sampling mouth is pressurized, by recirculating gas duct 3,
Recirculating gas duct 4 is sprayed into front-back wall secondary air passage 7 respectively by flue gas nozzle 6, and flue gas sprays into direction and Secondary Air flows to
It is mutually perpendicular to, conducive to the mixing of flue gas and Secondary Air, the swirl vane 6-1 being arranged in flue gas nozzle 6 enhances the turbulent flow of flue gas
Intensity enhances the mixing of flue gas and Secondary Air, 6 outlet port of flue gas nozzle setting flue gas be flared 6-2, increase flue gas with
The mixed area of Secondary Air, so that Secondary Air is sufficiently mixed with flue gas；Flue gas mixed with Secondary Air after by each on burner hearth
Overfire air port and fire air nozzle enter burner hearth, and it is too low not will cause burner hearth regional area oxygen amount, will not be to the combustion in burner hearth
Tissue is burnt to adversely affect.Simultaneously as flue gas is lower compared with the mixed oxygen content gas of Secondary Air, burner hearth is reduced
Interior excess air coefficient is conducive to inhibit NO in burner hearthxGeneration.
Claims (3)
1. a kind of flue gas recirculation device suitable for W flame boiler, it is characterised in that: the flue gas recirculation device includes cigarette
Gas probe tube, recirculation blower, recirculating gas duct and flue gas nozzle；Described gas sampling probe one end is equipped with flue gas and takes smoke pipe, leads to
Crossing flue gas takes smoke pipe to be connected with the flue after boiler desulfurization, and the other end passes through the recirculation blower and recirculating gas duct one end phase
Even；The other end of the recirculating gas duct is equipped with flue gas nozzle；The flue gas nozzle protrudes into boiler secondary air air duct, and spout
Direction flows to perpendicular with Secondary Air.
2. flue gas recirculation device according to claim 1, it is characterised in that: the flue gas spray nozzle front end is flaring.
3. flue gas recirculation device according to claim 2, it is characterised in that: be equipped with eddy flow leaf in the flue gas nozzle
Piece.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821547038.0U CN208952072U (en) | 2018-09-21 | 2018-09-21 | A kind of flue gas recirculation device suitable for W flame boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821547038.0U CN208952072U (en) | 2018-09-21 | 2018-09-21 | A kind of flue gas recirculation device suitable for W flame boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208952072U true CN208952072U (en) | 2019-06-07 |
Family
ID=66738955
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821547038.0U Active CN208952072U (en) | 2018-09-21 | 2018-09-21 | A kind of flue gas recirculation device suitable for W flame boiler |
Country Status (1)
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| CN (1) | CN208952072U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323245A (en) * | 2018-09-21 | 2019-02-12 | 国电南京电力试验研究有限公司 | A kind of flue gas recirculation method and device suitable for W flame boiler |
-
2018
- 2018-09-21 CN CN201821547038.0U patent/CN208952072U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109323245A (en) * | 2018-09-21 | 2019-02-12 | 国电南京电力试验研究有限公司 | A kind of flue gas recirculation method and device suitable for W flame boiler |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210023 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Patentee after: SOUTHEAST University Address before: 210023 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. Patentee before: SOUTHEAST University |