CN109084319A - The flue gas recirculation system to be exchanged heat using two-stage - Google Patents
The flue gas recirculation system to be exchanged heat using two-stage Download PDFInfo
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- CN109084319A CN109084319A CN201810862497.6A CN201810862497A CN109084319A CN 109084319 A CN109084319 A CN 109084319A CN 201810862497 A CN201810862497 A CN 201810862497A CN 109084319 A CN109084319 A CN 109084319A
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- flue gas
- flue
- stage
- recirculation system
- gas
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000003546 flue gas Substances 0.000 title claims abstract description 82
- 239000007789 gas Substances 0.000 claims abstract description 48
- 230000003134 recirculating effect Effects 0.000 claims abstract description 30
- 239000003245 coal Substances 0.000 claims abstract description 15
- 239000012716 precipitator Substances 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 8
- 239000000779 smoke Substances 0.000 claims description 8
- 230000008602 contraction Effects 0.000 claims description 7
- 230000000391 smoking effect Effects 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 5
- 238000004939 coking Methods 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 description 7
- 238000005299 abrasion Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 4
- 210000000038 chest Anatomy 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005119 centrifugation Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000013517 stratification Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
- F23B80/02—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for returning flue gases to the combustion chamber or to the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
- F23L15/045—Arrangements of recuperators using intermediate heat-transfer fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
- F23J2217/102—Intercepting solids by filters electrostatic
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention relates to a kind of flue gas recirculation systems to be exchanged heat using two-stage to inhibit or prevent burner hearth coking in order to effectively control fire box temperature level and design.The flue gas recirculation system that the present invention uses two-stage to exchange heat, 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 the electric precipitator, 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, the gas bypass of setting is provided on the preheater, high-pressure economizer is equipped on the gas bypass and low-pressure coal saver two-stage exchanges heat to reduce exhaust gas temperature.The present invention carries out reheat steam temperature temperature adjustment using baffle+flue gas recirculation combined type, improves the stability and economy of double reheat power generation sets operation.
Description
Technical field
Present invention relates particularly to a kind of flue gas recirculation systems to be exchanged heat using two-stage.
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.
Summary of the invention
In order to solve the above technical problems, promoting unit operation warp the object of the present invention is to provide a kind of reduction exhaust gas temperature
The flue gas recirculation system of Ji property to be exchanged heat using two-stage.
The flue gas recirculation system that the present invention uses two-stage to exchange heat, comprising: setting is connected in boiler flue gas outlet
Flue collector is successively arranged preheater, electric precipitator, air-introduced machine, the flue gas master after the electric precipitator on the flue gas main pipeline
Recirculating gas duct is communicated on pipeline, the recirculating gas duct is connected to boiler furnace, in the recirculation blower to Boiler Furnace
Recirculating gas duct between the air inlet of thorax is equipped with controllable register device, is provided with by the flue gas of setting on the preheater
Road is equipped with high-pressure economizer on the gas bypass and low-pressure coal saver two-stage exchanges heat to reduce exhaust gas temperature.
Further, high-pressure economizer is connected with low-pressure coal saver and is arranged, and high-pressure economizer is arranged in high-temperature flue gas
Side, low-pressure coal saver are arranged in outlet section, and for working medium countercurrently to exchange heat, high-pressure economizer and low-pressure coal saver are all made of H
Type extended surface tube.
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 recirculating gas duct uses circular flue, and the flow velocity of the flue gas in the recirculating gas duct is 10-
15m/s。
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 recirculation blower import and export setting sealing baffle door, sealing air be derived from seal fan or
Pressure fan.
Further, the access point of the recirculating gas duct and the burner hearth uses the fin for being used to prevent flue gas from flowing backwards to open
Header setting is converged in hole.
Further, 4 recirculation blowers are provided with, the flue gas that each recirculation blower extracts respectively is admitted to boiler respectively
Lower furnace portion quadrangle.
Further, the revolving speed of the recirculation blower is no more than 1000rpm, and impeller carries out monoblock cast, casing top
Install wear-resistant composite board additional.
According to the above aspect of the present invention, the present invention is had at least the following advantages using the flue gas recirculation system that two-stage exchanges heat:
The present invention extracts flue gas after furnace and is connected to furnace lower part by recirculation blower, to reduce exhaust gas temperature, preheating
Gas bypass is arranged in device, uses high-pressure economizer and low-pressure coal saver two-stage to exchange heat to reduce exhaust gas temperature, by furnace
Thorax mixes low-temperature flue gas and adjusts fuel exothermic character, strengthens heat convection to realize effective adjusting to reheat steam temperature, reaches and mention
Rise the purpose of unit performance driving economy.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is the schematic diagram for the flue gas recirculation system that the present invention is exchanged heat using two-stage；
Fig. 2 is the flow chart for the flue gas recirculation system that the present invention is exchanged heat using two-stage；
Fig. 3 is the schematic diagram of the flue draw-out device for the flue gas recirculation system that the present invention uses two-stage to exchange heat；
Fig. 4 is the E direction view of Fig. 3.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Embodiment 1
As shown in Fig. 1 to 2, the present embodiment uses the flue gas recirculation system that exchanges heat of two-stage, comprising: includes: setting
It is connected with flue collector in boiler flue gas outlet, preheater, electric precipitator, air-introduced machine, institute are successively arranged on the flue gas main pipeline
Recirculating gas duct is communicated on flue gas main pipeline after stating electric precipitator, the recirculating gas duct is connected to boiler furnace, in institute
It states recirculation blower to the recirculating gas duct between the air inlet of boiler furnace and is equipped with controllable register device, on the preheater
Gas bypass provided with setting, be equipped on the gas bypass high-pressure economizer and low-pressure coal saver two-stage exchange heat with
Reduce exhaust gas temperature.
High-pressure economizer is connected with low-pressure coal saver and is arranged, and high-pressure economizer is arranged in high-temperature flue gas side, and low pressure saves
Coal device is arranged in outlet section, and for working medium countercurrently to exchange heat, high-pressure economizer and low-pressure coal saver are all made of H-type extended surface tube.
The present embodiment, the investment of flue gas recirculation system will affect the variation of screen bottom smoke temperature, can be effectively controlled fire box temperature
Level inhibits or prevents burner hearth coking；Using suitable flue gas recirculation share, with the increase of flue gas recycled share, screen
Smoke temperature level decline in bottom reduces the radiant heat absorption of burner hearth and flue gas in the residence time of burner hearth, is arranged in upper furnace
Radiation heating-surface will not cause overheating problem to upper furnace superheater surface since flue-gas temperature slightly reduces.Furnace simultaneously
Thorax exit gas temperature will not increase.Since flue gas flow increases at convection heating surface, fume side exothermic coefficient increases, convection current
Heat output increases, and sender property outlet temperature rises, and the heating surface variation degree for being located flue gas stroke downstream is more obvious.Generally again
When circulating flue gas rate is 20%~25%, high pressure reheater and low pressure reheater steam temperature can be improved 30-40 DEG C.
Embodiment 2
As shown in Figs. 3-4, the flue gas recirculation system that the present embodiment uses two-stage to exchange heat, on the basis of embodiment 1
On, the recirculating gas duct is connected to by flue draw-out device with flue collector, and the flue draw-out device infantees is placed in flue collector
Top, top are round recirculating gas duct, and middle part is taper contraction section, and the bottom of taper contraction section is directly welded with flue collector,
Flue collector aperture widths size and smoking main pipeline are isometrical, and the bottom plate of flue collector is provided with smoke deflector, the deflector side of being welded
To angled along flue gas direction.
In the present embodiment, by the setting of smoking mouth deflector, the self gravity and speed difference of the dust in flue gas are utilized
Nature separating flue draw-out device is generated to be arranged at the top of denitration flue collector, top is the round supervisor that smokes, pipe diameter size according to
Smoking flow selects suitable flue gas flow rate to be chosen, and the design of circular flue can not only further decrease flue abrasion,
Flue resistance can also be reduced.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 effect, plays the role of preventing fume extracting device dust stratification.Bottom of device is directly welded with flue collector, flue collector aperture widths size
Isometrical with smoking main pipeline, length dimension is calculated according to selected flue gas flow rate and is determined, while a mouthful bottom plate setting of smoking is welded with flue gas
Deflector, deflector are welded the angled suitable flue gas direction in direction, and angle, spacing, the specification of deflector can pass through flue gas flow field mould
Quasi- result determines.Flue gas flow field distribution of particles analog result shows that, due to the setting of deflector, soot dust granule is in deflector section
Nearby generate speed difference, small size particle and greater particle size particle carry out gravity natural separation, most of soot dust granule still from
Flue collector is carried away by flue gas, can play preferable separating effect.In the present embodiment, deflector structure size: deflector is long
300mm is spent, deflector direction horizontal sextant angle is 60 °, and the equidistant 300mm of deflector is arranged.
Embodiment 3
The flue gas recirculation system that the present embodiment uses two-stage to exchange heat, on the basis of embodiment 1, the recycling
Flue uses circular flue, and the flow velocity of the flue gas in the recirculating gas duct is 10-15m/s.Recirculation blower entry and exit again
The inner wall in cycle flue region and turning elbow region posts wear resistant ceramic chip or abrasionproof hexsteel.
In the present embodiment, the flow velocity of flue is generally 10-15m/s, the too fast abrasion that will accelerate flue of flow velocity, but flue gas stream
Speed can not be too low, otherwise will cause the dust stratification in elbow deflecting region.The use of circular flue can be to avoid flue internal overarm support
Design use, not only can also further decrease flue resistance to avoid the erosive wear to flue internal overarm support.In blower
The patch Precautionary Measures such as wear resistant ceramic chip or abrasionproof hexsteel are taken in entry and exit flue region and turning elbow region.This implementation
Or more the use of measure can will greatly avoid the generation of flue abrasion condition.
Embodiment 4
The present embodiment is followed described again on the basis of embodiment 1 using the flue gas recirculation system that two-stage exchanges heat
Ring blower inlet and outlet setting sealing baffle door, sealing air are derived from seal fan or pressure fan.
The present embodiment, when gas recirculating fan stoppage in transit, may result in flue gas in the operational process of secondary boiler
Refluence.To prevent this from occurring, domestic and international similar projects experience is used for reference, can import and export and be arranged in gas recirculating fan
Sealing baffle door, sealing air are derived from Special seal blower or pressure fan, it is ensured that guard seal effect.
Embodiment 5
The flue gas recirculation system that the present embodiment uses two-stage to exchange heat, on the basis of embodiment 1, the recycling
The access point of flue and the burner hearth uses the fin aperture for being used to prevent flue gas from flowing backwards or converges header setting.
The present embodiment, in terms of preventing scaling loss, the access point of recirculating gas duct and burner hearth can be used fin aperture, converge collection
The measures such as case burn out flue for ensuring to occur flue gas refluence.In addition, flue gas recycled amount generally accounts for total exhaust gas volumn 10
- 20% or so, and position will not have an impact burning far from burner, therefore will not impact to slagging-off.
Embodiment 6
The flue gas recirculation system that the present embodiment uses two-stage to exchange heat, on the basis of embodiment 1, the recycling
The revolving speed of blower is no more than 1000rpm, and impeller carries out monoblock cast, and casing top installs wear-resistant composite board additional.
The through-flow medium of gas recirculating fan is the high medium containing dust of high temperature, the mechanism of abrasion be dust in air-flow entrainment and
Material erosive wear caused by the lower impact wall surface of self inertia effect.And in the exit region of centrifugation runner, grit is flowing
Moved longer a distance in road, multiple impacts occurred for most of and wall surface, substantially along pressure surface sliding or
Roll, and have certain pressure effect against wall surface, in this way caused by the abrasion of backing material belong to scratch formula grit and wear, dirt
Grain more exacerbates the extent of injury of grit abrasion in the concentration of pressure face near zone.
In the present embodiment, gas recirculating fan uses the measure of following combination Anti-wear Technology:
Using slow-speed of revolution blower, rotation speed of fan is no more than 1000rpm.
Impeller and casing are cast using New-type wear-resistant alloy, impeller carries out monoblock cast, and casing top installs additional resistance to
Grind composite plate.
Impeller surface uses novel build-up wear-resistant Fe-05 material.
Using blower flow Field Design new technology (such as three-dimensional flow), blower flow field is advanced optimized, improves whole abrasionproof.
After above-mentioned Anti-wear Technology measure, the blower continuous operation time limit fully met thermal power plants up to 2 years or more
Maintenance and service requirement.
Embodiment 7
The present embodiment is provided with 4 on the basis of embodiment 1 using the flue gas recirculation system that two-stage exchanges heat
Recirculation blower, the flue gas that each recirculation blower extracts respectively are admitted to boiler furnace lower part quadrangle respectively.Flue gas recycled is straight
After tapping into gas recirculating fan, it is admitted to boiler furnace lower part quadrangle.To increase flue gas flexible adjustment, Anyuan engineering is total
4 30% capacity centrifugation formula furnace cigarette blowers are set, frequency control is all made of.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of flue gas recirculation system to be exchanged heat using two-stage characterized by comprising be arranged in boiler flue gas outlet
It is connected with flue collector, is successively arranged preheater, electric precipitator, air-introduced machine on the flue gas main pipeline, after the electric precipitator
Recirculating gas duct is communicated on flue gas main pipeline, the recirculating gas duct is connected to boiler furnace, the recirculation blower extremely
Recirculating gas duct between the air inlet of boiler furnace is equipped with controllable register device, and the cigarette of setting is provided on the preheater
Gas bypass, is equipped with high-pressure economizer on the gas bypass and low-pressure coal saver two-stage exchanges heat to reduce exhaust gas temperature.
2. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that high pressure saves coal
Device is connected with low-pressure coal saver and is arranged, and high-pressure economizer is arranged in high-temperature flue gas side, and low-pressure coal saver is arranged in outlet section,
For working medium countercurrently to exchange heat, high-pressure economizer and low-pressure coal saver are all made of H-type extended surface tube.
3. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that described to follow again
Annular smoke flue is connected to by flue draw-out device with 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 are taper contraction section, and the bottom of taper contraction section is directly welded with flue collector, and flue collector aperture is wide
It spends size and smoking main pipeline is isometrical, the bottom plate of flue collector is provided with smoke deflector, and it is angled along cigarette that deflector is welded direction
Gas direction.
4. the flue gas recirculation system according to claim 3 to be exchanged heat using two-stage, which is characterized in that deflector is long
300mm is spent, deflector direction horizontal sextant angle is 60 °, and the equidistant 300mm of deflector is arranged.
5. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that described to follow again
Annular smoke flue uses circular flue, and the flow velocity of the flue gas in the recirculating gas duct is 10-15m/s.
6. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that recycling
The inner wall in blower entry and exit recirculating gas duct region and turning elbow region posts wear resistant ceramic chip or abrasionproof hexsteel.
7. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that it is described again
Circulating fan inlet and outlet setting sealing baffle door, sealing air are derived from seal fan or pressure fan.
8. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that described to follow again
The access point of annular smoke flue and the burner hearth uses the fin aperture for being used to prevent flue gas from flowing backwards or converges header setting.
9. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that be provided with 4
Platform recirculation blower, the flue gas that each recirculation blower extracts respectively are admitted to boiler furnace lower part quadrangle respectively.
10. the flue gas recirculation system according to claim 1 to be exchanged heat using two-stage, which is characterized in that it is described again
The revolving speed of circulating fan is no more than 1000rpm, and impeller carries out monoblock cast, and casing top installs wear-resistant composite board additional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810862497.6A CN109084319B (en) | 2018-08-01 | 2018-08-01 | Flue gas recirculation system adopting two stages for heat exchange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810862497.6A CN109084319B (en) | 2018-08-01 | 2018-08-01 | Flue gas recirculation system adopting two stages for heat exchange |
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| Publication Number | Publication Date |
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| CN109084319A true CN109084319A (en) | 2018-12-25 |
| CN109084319B CN109084319B (en) | 2023-12-19 |
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| CN201810862497.6A Active CN109084319B (en) | 2018-08-01 | 2018-08-01 | Flue gas recirculation system adopting two stages for heat exchange |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110107882A (en) * | 2019-05-31 | 2019-08-09 | 德润鑫鼎(北京)工程技术有限公司 | A kind of steam waste-heat recovery device for boiler combustion system |
| CN112138513A (en) * | 2020-10-26 | 2020-12-29 | 河北冀研能源科学技术研究院有限公司 | Device capable of dynamically adjusting water receiving rate by membrane method and adjusting and controlling method |
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| CN109084319B (en) | 2023-12-19 |
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