CN209054550U - Flue gas recirculation system - Google Patents
Flue gas recirculation system Download PDFInfo
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- CN209054550U CN209054550U CN201821228947.8U CN201821228947U CN209054550U CN 209054550 U CN209054550 U CN 209054550U CN 201821228947 U CN201821228947 U CN 201821228947U CN 209054550 U CN209054550 U CN 209054550U
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- flue
- flue gas
- recirculation system
- preheater
- air
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Abstract
The utility model relates to a kind of flue gas recirculation systems, in order to provide a kind of flue gas recirculation system of optimization.The utility model flue gas recirculation system, flue collector is connected in boiler flue gas outlet including being arranged, preheater is successively arranged on the flue gas main pipeline, electric precipitator, air-introduced machine, recirculating gas duct is communicated on flue gas main pipeline after air-introduced machine, the recirculating gas duct is connected to boiler furnace, controllable register device is equipped on recirculating gas duct between the air inlet of the recirculation blower to boiler furnace, air preheater is provided on the preheater to bypass, cooler is set in air preheater bypass, smoke temperature is dropped to after 120 DEG C from about 380 DEG C and is input to the preheater by the cooler, the cooling water of the cooler uses condensed water.The utility model improves the stability and economy of double reheat power generation sets operation.
Description
Technical field
The utility model is specifically related to a kind of flue gas recirculation system.
Background technique
The difficult point of double reheat boiler is main vapour, single reheat vapour, the regulation problem between three steam temperatures of double reheat vapour,
The outlet temperature of three kinds of steam adjusts complicated.Reheat steam temperature regulative mode choose rationally whether be directly related to unit operation can
By property, unit efficiency etc., or even it is directly related to the safe operation of power plant and power grid, therefore the method for temperature control of double reheat boiler
And reliability is most important for double reheat boiler design.
Utility model content
In order to solve the above technical problems, promoting unit fortune the purpose of the utility model is to provide a kind of reduction exhaust gas temperature
The flue gas recirculation system of row economy.
The utility model flue gas recirculation system, comprising: be arranged and be connected with flue collector, the flue gas in boiler flue gas outlet
It is successively arranged preheater, electric precipitator, air-introduced machine on main pipeline, is communicated with recycling cigarette on the flue gas main pipeline after air-introduced machine
Road, the recirculating gas duct are connected to boiler furnace, following between the air inlet of the recirculation blower to boiler furnace again
Annular smoke flue is equipped with controllable register device, is provided with air preheater on the preheater and bypasses, and is arranged in air preheater bypass
Smoke temperature is dropped to after 120 DEG C from about 380 DEG C and is input to the preheater by cooler, the cooler, the cooling of the cooler
Water uses condensed water.
Further, the recirculating gas duct uses circular flue.
Further, the inner wall in recirculation blower entry and exit recirculating gas duct region and turning elbow region posts resistance to
Grind potsherd or abrasionproof hexsteel.
Further, the recirculating gas duct is connected to by flue draw-out device with flue collector, the flue draw-out device
Infantees is placed at the top of flue collector, and top is round recirculating gas duct, and middle part is taper contraction section, the bottom of taper contraction section and master
Flue directly welds, and flue collector aperture widths size and smoking main pipeline are isometrical, and the bottom plate of flue collector is provided with smoke deflector,
It is angled along flue gas direction that deflector is welded direction.
Further, deflector length 300mm, deflector direction horizontal sextant angle are 60 °, and the equidistant 300mm of deflector is carried out
Arrangement.
Further, the recirculation blower inlet and outlet be equipped with sealing baffle door, sealing air be derived from seal fan or
Pressure fan.
Further, the access point of recirculating gas duct and burner hearth uses the fin aperture for being used to prevent flue gas from flowing backwards or converges
Header setting.
Further, 4 30% capacity centrifugation formula recirculation blowers, the flue gas that each recirculation blower extracts respectively are provided with
It is admitted to boiler furnace lower part quadrangle respectively.
Further, the spiral case inner wall of the recirculation blower posts wear resistant ceramic chip.
According to the above aspect of the present invention, the utility model flue gas recirculation system has at least the following advantages:
The utility model is to meet double reheat pot using baffle+flue gas recirculation combined type reheat steam temperature method of temperature control
Furnace reheating vapour steam temperature is adjusted.The stability and economy for improving double reheat power generation sets operation, can be used as subsequent similar projects scheme
The important reference of design.
The above description is merely an outline of the technical solution of the present invention, in order to better understand the skill of the utility model
Art means, and can be implemented in accordance with the contents of the specification, below on the preferred embodiment of the present invention and the accompanying drawings in detail
It describes in detail bright as after.
Detailed description of the invention
Fig. 1 is the schematic diagram of the utility model flue gas recirculation system；
Fig. 2 is the schematic diagram of the flue draw-out device of the utility model flue gas recirculation system；
Fig. 3 is the E direction view of Fig. 2.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
Embodiment 1
As shown in Figure 1, the present embodiment flue gas recirculation system, comprising: it is arranged and is connected with flue collector in boiler flue gas outlet,
It is successively arranged preheater, electric precipitator, air-introduced machine on the flue gas main pipeline, is communicated with again on the flue gas main pipeline after air-introduced machine
Cycle flue, the recirculating gas duct are connected to boiler furnace, between the air inlet of the recirculation blower to boiler furnace
Recirculating gas duct be equipped with controllable register device, air preheater is provided on the preheater and is bypassed, is bypassed in the air preheater
Smoke temperature is dropped to after 120 DEG C from about 380 DEG C and is input to the preheater by upper setting cooler, the cooler, the cooler
Cooling water use condensed water.
The present embodiment uses convective heat transfer process completely, brings the heat in burner hearth to reheater by flue gas recirculation
System, it can be ensured that at reheat steam turbine set in safe range.(about 17% exhaust gas volumn) is bypassed provided with air preheater, is being bypassed
Smoke temperature is dropped to 120 DEG C from about 380 DEG C by upper setting cooler, and cooling water uses condensed water, and maximum heat exchange amount is about 145GJ/h
(40.3Mj/s) accounts for the 2.98% of the total quantity of heat given up of boiler.Condensed water as cooling water enters condensate system after being heated,
Low-pressure pumping steam amount is reduced, more in steam turbine can do work, obtain income.But due to condensed water compared with water supply for, be lower
The energy of quality, identical heat, acting ability difference is larger, and utilization efficiency is low.The coal consumption for power generation of unit is 265.3g/kW.h
(electronic air-introduced machine), 267.86g/kW.h (steam-driven induced draft fan).
Embodiment 2
As shown in Fig. 2 to 3, the present embodiment flue gas recirculation system, on the basis of embodiment 1, the recirculating gas duct
Be connected to by flue draw-out device with flue collector, the flue draw-out device infantees is placed at the top of flue collector, top be it is round again
Cycle flue 1, middle part are taper contraction section 2, and the bottom of taper contraction section is directly welded with flue collector, flue collector aperture widths ruler
Very little isometrical with smoking main pipeline, the bottom plate of flue collector is provided with smoke deflector 3, and it is angled along flue gas side that deflector is welded direction
To.
In the present embodiment, fume extraction device is arranged at the top of denitration flue collector, and top is the round supervisor that smokes, and caliber is big
Small to select suitable flue gas flow rate to be chosen according to smoking flow, the design of circular flue can not only further decrease flue
Abrasion, can also reduce flue resistance.It is taper contraction section in the middle part of device, generates the effect of high flue gas flow rate in part, increases
Flue gas band dirt acts on, and plays the role of preventing fume extracting device dust stratification.Bottom of device is directly welded with flue collector, and flue collector aperture is wide
It spends size and smoking main pipeline is isometrical, length dimension is calculated according to selected flue gas flow rate and determined, while a mouthful bottom plate setting weldering of smoking
There is smoke deflector, deflector is welded the angled suitable flue gas direction in direction, and angle, spacing, the specification of deflector can pass through flue gas
Flow field simulation result determines.Flue gas flow field distribution of particles analog result shows that, due to the setting of deflector, soot dust granule is in water conservancy diversion
Plate section nearby generates speed difference, and small size particle and greater particle size particle carry out gravity natural separation, most of soot dust granule
Still it is carried away from flue collector by flue gas, preferable separating effect can be played.Deflector structure size: deflector length
300mm, deflector direction horizontal sextant angle are 60 °, and the equidistant 300mm of deflector is arranged.
Embodiment 3
The present embodiment the present embodiment flue gas recirculation system, on the basis of embodiment 1, the recirculating gas duct is using circle
Shape flue.Inner wall in recirculation blower entry and exit recirculating gas duct region and turning elbow region post wear resistant ceramic chip or
Person's abrasionproof hexsteel.
In the present embodiment, the use of circular flue will can use to avoid the design of flue internal overarm support, not only can be to avoid
To the erosive wear of flue internal overarm support, flue resistance can also be further decreased.It is curved in blower entry and exit flue region and deflecting
Head region takes the patch Precautionary Measures such as wear resistant ceramic chip or abrasionproof hexsteel.
Embodiment 4
The present embodiment flue gas recirculation system is equipped with close on the basis of embodiment 1 in recirculation blower inlet and outlet
Baffle door is sealed, sealing air is derived from seal fan or pressure fan.The access point of recirculating gas duct and burner hearth, which uses, to be used to prevent cigarette
The fin aperture or converge header setting that gas is flow backwards.The spiral case inner wall of the recirculation blower posts wear resistant ceramic chip.
In the present embodiment, in the operational process of secondary boiler, when gas recirculating fan stoppage in transit, cigarette may result in
The refluence of gas.To prevent this from occurring, setting sealing baffle door is imported and exported in gas recirculating fan, sealing air is derived from specially
With seal fan or pressure fan, it is ensured that guard seal effect.
In terms of preventing scaling loss, the access point of recirculating gas duct and burner hearth can be used fin aperture, converge the measures such as header,
Flue is burnt out for ensuring to occur flue gas refluence.In addition, flue gas recycled amount generally accounts for total 10-20% left side of exhaust gas volumn
The right side, and position will not have an impact burning far from burner, therefore will not impact to slagging-off.
The various embodiments described above after flue gas recycled is directly entered gas recirculating fan, are admitted to boiler furnace lower part four
Angle.To increase flue gas flexible adjustment, 4 30% capacity centrifugation formula furnace cigarette blowers are set altogether.
The above is only the preferred embodiment of the utility model, is not intended to limit the utility model, it is noted that
For those skilled in the art, without deviating from the technical principle of the utility model, it can also do
Several improvements and modifications out, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (9)
1. a kind of flue gas recirculation system characterized by comprising it is arranged and is connected with flue collector in boiler flue gas outlet, it is described
It is successively arranged preheater, electric precipitator, air-introduced machine on flue collector, recirculating gas duct, institute are communicated on the flue collector after air-introduced machine
State recirculating gas duct and be connected to boiler furnace, the recirculating gas duct is equipped with recirculation blower, the recirculation blower extremely
Recirculating gas duct between the air inlet of boiler furnace is equipped with controllable register device, is provided with by air preheater on the preheater
Cooler is arranged in air preheater bypass in road, and smoke temperature is dropped to after 120 DEG C from about 380 DEG C and is input to institute by the cooler
Preheater is stated, the cooling water of the cooler uses condensed water.
2. flue gas recirculation system according to claim 1, which is characterized in that the recirculating gas duct is using round cigarette
Road.
3. flue gas recirculation system according to claim 1, which is characterized in that recycled in recirculation blower entry and exit
The inner wall in flue region and turning elbow region posts wear resistant ceramic chip or abrasionproof hexsteel.
4. flue gas recirculation system according to claim 1, which is characterized in that the recirculating gas duct is extracted by flue
Device is connected to flue collector, and the flue draw-out device infantees is placed at the top of flue collector, and top is round recirculating gas duct, middle part
Bottom for taper contraction section, taper contraction section is directly welded with flue collector, flue collector aperture widths size and smoking main pipeline
Isometrical, the bottom plate of flue collector is provided with smoke deflector, and it is angled along flue gas direction that deflector is welded direction.
5. flue gas recirculation system according to claim 4, which is characterized in that deflector length 300mm, deflector direction
Horizontal sextant angle is 60 °, and the equidistant 300mm of deflector is arranged.
6. flue gas recirculation system according to claim 1, which is characterized in that be equipped in recirculation blower inlet and outlet
Sealing baffle door, sealing air are derived from seal fan or pressure fan.
7. flue gas recirculation system according to claim 1, which is characterized in that the access point of recirculating gas duct and burner hearth is adopted
With the fin aperture for being used to prevent flue gas from flowing backwards or converge header setting.
8. flue gas recirculation system according to claim 1, which is characterized in that be provided with 4 30% capacity centrifugation formulas again
Circulating fan, the flue gas that each recirculation blower extracts respectively are admitted to boiler furnace lower part quadrangle respectively.
9. flue gas recirculation system according to claim 1, which is characterized in that the spiral case inner wall of the recirculation blower pastes
There is wear resistant ceramic chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228947.8U CN209054550U (en) | 2018-08-01 | 2018-08-01 | Flue gas recirculation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228947.8U CN209054550U (en) | 2018-08-01 | 2018-08-01 | Flue gas recirculation system |
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| CN209054550U true CN209054550U (en) | 2019-07-02 |
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| CN201821228947.8U Active CN209054550U (en) | 2018-08-01 | 2018-08-01 | Flue gas recirculation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925745A (en) * | 2019-12-11 | 2020-03-27 | 中国能源建设集团广东省电力设计研究院有限公司 | Novel efficiency improving system of cold smoke recycling unit and control method |
| CN110925744A (en) * | 2019-12-11 | 2020-03-27 | 中国能源建设集团广东省电力设计研究院有限公司 | System for recycling bypass flue gas heat from heat conducting oil of cold flue gas recirculation unit and control method |
-
2018
- 2018-08-01 CN CN201821228947.8U patent/CN209054550U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925745A (en) * | 2019-12-11 | 2020-03-27 | 中国能源建设集团广东省电力设计研究院有限公司 | Novel efficiency improving system of cold smoke recycling unit and control method |
| CN110925744A (en) * | 2019-12-11 | 2020-03-27 | 中国能源建设集团广东省电力设计研究院有限公司 | System for recycling bypass flue gas heat from heat conducting oil of cold flue gas recirculation unit and control method |
| CN110925745B (en) * | 2019-12-11 | 2021-09-17 | 中国能源建设集团广东省电力设计研究院有限公司 | Novel efficiency improving system of cold smoke recycling unit and control method |
| CN110925744B (en) * | 2019-12-11 | 2021-09-17 | 中国能源建设集团广东省电力设计研究院有限公司 | System for recycling bypass flue gas heat from heat conducting oil of cold flue gas recirculation unit and control method |
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