CN205245141U - Air classification preboiler - Google Patents
Air classification preboiler Download PDFInfo
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- CN205245141U CN205245141U CN201521046642.1U CN201521046642U CN205245141U CN 205245141 U CN205245141 U CN 205245141U CN 201521046642 U CN201521046642 U CN 201521046642U CN 205245141 U CN205245141 U CN 205245141U
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Abstract
The utility model provides an air classification preboiler, relates to thermal power factory and utilizes the hot flue gas of afterbody flue to carry out the equipment that preheats to the cold air. This boiler increases at least one -level high temperature air preheater on current boiler structure's basis, it arranges in the afterbody flue before the denitrification facility, and along flue gas flow direction and economizer tandem arrangement, also can connect in parallel or the series -parallel connection is arranged, parts such as elementary economizer and medium temperature air heater can also be add to this boiler. The utility model discloses a multistage air heater's setting, but the degree of depth reduces boiler exhaust gas temperature, improves boiler efficiency by a wide margin, can improve simultaneously the overgrate air and go into surely the firing nature of furnace temperature degree and boiler, reduce the combustion -supporting oil expenses of boiler, in addition, through the setting of elementary economizer, can adjust department of denitrification facility institute flue temperature in a flexible way for denitrification facility can both realize high -efficient denitration in full load range. Through setting up wind, overgrate air warm braw system of bleeding, can improve the corrosion problems that low temperature received the hot side.
Description
Technical field
A kind of air classification preboiler, relates to thermal power plant and utilizes the hot flue gas of back-end ductwork to carry out degree of depth preheating to cold airTechnology.
Background technology
Energy-saving and emission-reduction become the much-talked-about topic that the whole world is paid close attention to the most gradually, improve energy utilization rate, reduce energy resource consumption, just likeBecome the historical important task that all trades and professions researcher bears. And electric power is as industrial development and constantly propping up of progress of social economySupport industry, wherein the coal resources of heat power station consumption account for the half of coal total flow, in energy resource structure in veryImportant position.
For thermal power generation unit, under the condition of same steam parameter, boiler efficiency is the most critical factor that affects unit coal consumption.Under the present art, boiler design efficiency is mostly in 92% left and right, and in the loss of its efficiency, flue gas loss stands in the breach. AdoptIt is the technology that current thermal power generation unit generally adopts that air preheater utilizes the hot flue gas of back-end ductwork to heat cold air. SoAnd due to after conventional boiler is arranged in economizer by air preheater conventionally, its inlet flue gas temperature has limited and has been carried out degree of depth preheatingPossibility, make exhaust gas temperature be difficult to further decline.
Along with the increasingly attention of entire society to energy-saving and emission-reduction in recent years, State-level is put into effect more and more more and more tighter energy-conservation subtractingRow's policy, Thermal Power Generation Industry starts to manage raising machine, stove, auxiliary efficiency from all angles, domesticly damages in order further to reduce smoke evacuationLose, conventionally utilize the low temperature exhaust heat after air preheater to add Hot gas turbine condensate water by technology such as low-level (stack-gas) economizers, and then squeeze vapourTurbine low-pressure pumping steam, exchanges meagre unit acting capability improving for, and the actual effect of utilizing of its energy is only generally 20% left and right. CloselyOver year, also have in air preheater side the direct heated feed water of bypass extraction part higher temperature flue gas is set, and assisted cryogenic economizerDeng measure, the quality of utilizing to improve fume afterheat, but still less than 40% of complex energy utilization ratio.
Utility model content
The purpose of this utility model is to provide a kind of air classification preboiler, by high temperature profit is set in this boiler back end ductworkWind, a Secondary Air are carried out to degree of depth preheating with high temperature tail flue gas, enter a wind, two of boiler to realize further raisingThe temperature of inferior wind, thus can further reduce exhaust gas temperature, and by obtain exhaust gas temperature decline heat all for carryingThe object of high boiler efficiency.
The technical solution of the utility model is as follows:
A kind of air classification preboiler, described boiler comprises boiler body, back-end ductwork, superheater, reheater, province's coalDevice, denitrification apparatus, air preheater, pressure fan outlet conduit and primary air fan outlet conduit; Denitrification apparatus is arranged in economizerIn back-end ductwork afterwards, air preheater is arranged in the back-end ductwork after denitrification apparatus, and the Secondary Air of air preheater entersMouth is connected with pressure fan outlet conduit, and a wind inlet of air preheater is connected with primary air fan outlet conduit; Its feature existIn: this air classification preboiler also comprises at least one-level high-temperature air preheater, and high-temperature air preheater is arranged in denitrification apparatusIn back-end ductwork before, along flow of flue gas direction and economizer arranged in series, or be arranged in parallel, or series-parallel connection is arranged; High temperatureThe secondary air inlet of air preheater is connected by pipeline with the outlet of the Secondary Air of air preheater, the secondary of high-temperature air preheaterWind outlet is connected with the Secondary Air hot air duct of boiler body.
Another technical characterictic of the present utility model is: this air classification preboiler also comprises elementary economizer, elementary economizerBe arranged in the back-end ductwork between denitrification apparatus and air preheater; The water side entrance of elementary economizer and boiler feedwater pipeline phaseConnect, the water side outlet of elementary economizer is connected by pipeline with the water side entrance of economizer.
Another technical characterictic of the present utility model is: this air classification preboiler also comprises middle warm air preheater, and middle temperature is emptyAir preheater is arranged in the back-end ductwork between denitrification apparatus and air preheater, along flow of flue gas direction and elementary economizer stringConnection layout, or be arranged in parallel, or series-parallel connection is arranged; The secondary air inlet of middle warm air preheater and the Secondary Air of air preheaterOutlet is connected by pipeline, and Secondary Air outlet and the secondary air inlet of high-temperature air preheater of middle warm air preheater pass through pipelineBe connected; The secondary air inlet of high-temperature air preheater is no longer directly connected with the Secondary Air outlet of air preheater.
Preferably, middle warm air preheater is also provided with wind heating surface one time, and wind inlet and the air of middle warm air preheater are pre-A wind outlet of hot device is connected by pipeline, a wind outlet of middle warm air preheater and a wind-heat airduct of boiler bodyRoad is connected.
Preferably, high-temperature air preheater is also provided with wind heating surface one time, and wind inlet of high-temperature air preheater and middle temperature are emptyA wind outlet of air preheater is connected by pipeline, a wind outlet of high-temperature air preheater and a wind-heat of boiler bodyWind pipeline is connected; A wind outlet of middle warm air preheater is no longer directly connected with a wind-heat wind pipeline of boiler body.
Another technical characterictic of the present utility model is: this air classification preboiler also comprises dust catcher device and desulfurizing tower, removesDirt apparatus is arranged in the back-end ductwork after air preheater, and desulfurizing tower is arranged in the back-end ductwork after dust catcher device,The preposition air preheater of Secondary Air is set between dust catcher device and desulfurizing tower; The Secondary Air of the preposition air preheater of Secondary Air entersMouth is connected with pressure fan outlet conduit, the Secondary Air outlet of the preposition air preheater of Secondary Air and the secondary air inlet of air preheaterBe connected by pipeline; The secondary air inlet of air preheater is no longer directly connected with pressure fan outlet conduit.
Preferably, the preposition air preheater of wind is set between dust catcher device and desulfurizing tower one time, a preposition air preheat of windA wind inlet of device is connected with primary air fan outlet conduit, a wind outlet and the air preheat of a preposition air preheater of windA wind inlet of device is connected by pipeline; A wind inlet of air preheater no longer with the direct phase of primary air fan outlet conduitConnect; .
Another technical characterictic of the present utility model is: when the preposition air preheater of Secondary Air and preposition air preheater of wind withWhen time exists, one time the preposition air preheater of wind is arranged in parallel along flow of flue gas direction and the preposition air preheater of Secondary Air, or stringConnection is arranged, or series-parallel connection is arranged; A wind inlet of a preposition air preheater of wind is connected with primary air fan outlet conduit, and oneA wind outlet of the preposition air preheater of inferior wind is connected by pipeline with a wind inlet of air preheater; Air preheaterSecondary air inlet is no longer directly connected with pressure fan outlet conduit, and a wind inlet of air preheater no longer exports with primary air fanPipeline is directly connected.
Another technical characterictic of the present utility model is: this air classification preboiler also comprises the Secondary Air blower fan of bleeding, describedSecondary Air bleed blower and pipeline from air preheater or the outlet of warm air preheater or the Secondary Air of high-temperature air preheaterThe hot Secondary Air of extension, and be connected with pressure fan outlet conduit by pipeline.
Another technical characterictic of the present utility model is: this air classification preboiler also comprises the wind blower fan of bleeding, describedWind bleed blower and pipeline from air preheater or warm air preheater or a wind outlet of high-temperature air preheaterExtension heat primary air, and be connected with primary air fan outlet conduit by pipeline.
The utility model compared with prior art, has the following advantages and beneficial effect:
1. by the multi-staged air preheater setting of high-temperature air preheater is set, the degree of depth reduces exhaust gas temperature, significantly improvesBoiler efficiency; 2. improve Secondary Air charging temperature, significantly improve boiler combustion stability and underload on-load ability, reduce boilerHelp fuel oil; 3. by improving secondary air temperature, can optimize boiler excess air coefficient, further improve boiler efficiency; 4. pass throughThe setting of elementary economizer, can adjust denitrification apparatus flue temperature of living in flexibly, make denitrification apparatus within the scope of full load allCan realize NO_x Reduction by Effective; 5. by wind, the Secondary Air warm air system of bleeding is set, can improve low temperature part air preheaterEntrance cold wind temperature, improve the etching problem of low temperature heating surface.
Brief description of the drawings
The structural principle schematic diagram of a kind of air classification preboiler that Fig. 1 provides for the utility model.
In figure: 1 ?boiler body; 2 ?back-end ductwork; 3 ?superheater; 4 ?reheater; 5 ?economizer; 6 ?denitrification apparatus; 7 ?airPreheater; 8 ?pressure fan outlet conduit; 9 primary air fan outlet conduits; 10 ?high-temperature air preheater; 11 ?elementary economizer; 12 ?Middle warm air preheater; 13 ?dust catcher device; 14 ?desulfurizing tower; 15 ?the preposition air preheater of Secondary Air; The preposition sky of 16 ?mono-time windAir preheater; 17 ?the Secondary Air blower fan of bleeding; The 18 ?mono-time wind blower fan of bleeding.
Detailed description of the invention
Below in conjunction with accompanying drawing, operation principle of the present utility model, concrete structure and implementation method are described further:
The structure principle chart of a kind of embodiment of a kind of air classification preboiler that Fig. 1 provides for the utility model, it is basicStructure comprises boiler body 1, back-end ductwork 2, superheater 3, reheater 4, economizer 5, denitrification apparatus 6, air preheater7, pressure fan outlet conduit 8, primary air fan outlet conduit 9, high-temperature air preheater 10, elementary economizer 11, middle warm airThe preposition air preheater of preheater 12, dust catcher device 13, desulfurizing tower 14, Secondary Air 15, a preposition air preheater of wind16, Secondary Air blower fan 17 and the wind blower fan 18 of bleeding of bleeding; Denitrification apparatus 6 is arranged in the back-end ductwork after economizer 5In, air preheater 7 is arranged in the back-end ductwork after denitrification apparatus 6; High-temperature air preheater 10 is arranged in denitrification apparatusIn back-end ductwork before 6, being arranged in parallel along flow of flue gas direction and economizer 5 (also can arranged in series according to actual conditionsBefore economizer 5, or arrange with economizer 5 series-parallel connections), the secondary air inlet of high-temperature air preheater 10 and air preheater7 Secondary Air outlet is connected by pipeline, the Secondary Air outlet of high-temperature air preheater 10 and the Secondary Air hot blast of boiler body 1Pipeline is connected; Elementary economizer 11 is arranged in the back-end ductwork between denitrification apparatus 6 and air preheater 7; Middle warm air is pre-Hot device 12 is arranged in the back-end ductwork between equipment for denitrifying flue gas 6 and air preheater 7, along flow of flue gas direction and elementary provinceCoal device 11 be arranged in parallel (according to actual conditions also can arranged in series before elementary economizer 11, or with elementary economizer 11Series-parallel connection is arranged); Dust catcher device 13 is arranged in the back-end ductwork after air preheater 7, and desulfurizing tower 14 is arranged in dedusterIn back-end ductwork after device 13, the preposition air preheater of Secondary Air is set between dust catcher device 13 and desulfurizing tower 1415 and a preposition air preheater 16 of 16, wind of the preposition air preheater of wind along flow of flue gas direction and the preposition sky of Secondary AirAir preheater 15 is arranged in parallel (according to actual conditions needs, also can arranged in series, or series-parallel connection is arranged).
The Secondary Air outlet of the secondary air inlet of high-temperature air preheater 10 and middle warm air preheater 12 by pipeline be connected (asFruit does not have to be directly connected by pipeline with the Secondary Air outlet of air preheater 7 in middle warm air preheater 12 situations), high temperature skyThe Secondary Air outlet of air preheater 10 is connected with the Secondary Air hot air duct of boiler body 1; The water side entrance of elementary economizer 11Be connected with boiler feedwater pipeline, the water side outlet of elementary economizer 11 is connected by pipeline with the water side entrance of economizer 5; Middle temperatureThe secondary air inlet of air preheater 12 is connected by pipeline with the Secondary Air outlet of air preheater 7, middle warm air preheater12 Secondary Air outlet is connected by pipeline with the secondary air inlet of high-temperature air preheater 10; If middle warm air preheater 12Also be provided with wind heating surface one time, a wind outlet of wind inlet of middle warm air preheater 12 and air preheater 7 is by pipeRoad is connected, and a wind outlet of middle warm air preheater 12 is connected with a wind-heat wind pipeline of boiler body 1; If high temperature skyAir preheater 10 is also provided with wind heating surface one time, wind inlet of high-temperature air preheater 10 and middle warm air preheater 12The outlet of wind be connected by pipeline, a wind outlet of high-temperature air preheater 10 and a wind-heat airduct of boiler body 1Road is connected, and a wind outlet of middle warm air preheater 12 is no longer directly connected with a wind-heat wind pipeline of boiler body 1; WhenWhen the preposition air preheater 15 of Secondary Air is set, the secondary air inlet of the preposition air preheater 15 of Secondary Air and pressure fan outletRoad 8 is connected, and the Secondary Air outlet of the preposition air preheater 15 of Secondary Air is passed through pipeline phase with the secondary air inlet of air preheater 7Connect, the secondary air inlet of air preheater 7 is no longer directly directly connected with pressure fan outlet conduit 8; When arranging, a wind is prepositionWhen air preheater 16, a wind inlet of a preposition air preheater 16 of wind is connected with primary air fan outlet conduit 9, and oneA wind outlet of the preposition air preheater 16 of inferior wind is connected by pipeline with a wind inlet of air preheater 7, air preheatThe secondary air inlet of device 7 is no longer directly directly connected with pressure fan outlet conduit 8.
In the time Secondary Air is set bleeds blower fan 17, the Secondary Air blower fan 17 of bleeding goes out from the Secondary Air of air preheater 7 by pipelineMouthful (according to the actual conditions also therefrom Secondary Air of warm air preheater 12 outlet, or high-temperature air preheater 10 twoInferior wind outlet) draw a part of hot Secondary Air, and be connected with pressure fan outlet conduit 8 by pipeline, by the hot Secondary Air extractingThe Secondary Air entrance that enters the preposition air preheater 15 of Secondary Air after mixing with cold Secondary Air further heats (as preposition without Secondary AirIn air preheater 15 situations, the Secondary Air entrance that directly enters air preheater further heats); When being set, a wind bleedsWhen blower fan 18, wind blower fan 18 of bleeding (also can according to actual conditions from a wind outlet of air preheater 7 by pipelineWith a wind outlet of warm air preheater 12 therefrom, or a wind outlet of high-temperature air preheater 8) draw part heatA wind, and be connected with primary air fan outlet conduit 9 by pipeline, after being mixed with a cold wind, the heat primary air of extraction entersA wind entrance of a preposition air preheater 15 of wind further heat (as without in preposition air preheater 16 situations of wind,A wind entrance that directly enters air preheater further heats).
Claims (10)
1. an air classification preboiler, described boiler comprise boiler body (1), back-end ductwork (2), superheater (3),Reheater (4), economizer (5), denitrification apparatus (6), air preheater (7), pressure fan outlet conduit (8) and a windMachine outlet conduit (9); Denitrification apparatus (6) is arranged in the back-end ductwork after economizer, and air preheater (7) is arranged inIn denitrification apparatus (6) back-end ductwork afterwards, the secondary air inlet of air preheater (7) and pressure fan outlet conduit (8) phaseConnect, a wind inlet of air preheater (7) is connected with primary air fan outlet conduit (9); It is characterized in that: this airClassification preboiler also comprises at least one-level high-temperature air preheater (10), and high-temperature air preheater (10) is arranged in denitrification apparatus(6) in back-end ductwork before, along flow of flue gas direction and economizer (5) arranged in series, or be arranged in parallel, or series-parallel connectionArrange; The secondary air inlet of high-temperature air preheater (10) is connected by pipeline with the Secondary Air outlet of air preheater (7),The Secondary Air outlet of high-temperature air preheater (10) is connected with the Secondary Air hot air duct of boiler body (1).
2. according to a kind of air classification preboiler claimed in claim 1, it is characterized in that: this air classification preboiler alsoComprise elementary economizer (11), elementary economizer (11) is arranged in the tail between denitrification apparatus (6) and air preheater (7)In portion's flue; The water side entrance of elementary economizer (11) is connected with boiler feedwater pipeline, and the water side of elementary economizer (11) goes outMouth is connected by pipeline with the water side entrance of economizer (5).
3. according to a kind of air classification preboiler claimed in claim 2, it is characterized in that: this air classification preboiler alsoComprise middle warm air preheater (12), middle warm air preheater (12) is arranged in denitrification apparatus (6) and air preheater (7)Between back-end ductwork in, along flow of flue gas direction and elementary economizer (11) arranged in series, or be arranged in parallel, or series-parallel connectionArrange; The secondary air inlet of middle warm air preheater (12) is connected by pipeline with the Secondary Air outlet of air preheater (7),The Secondary Air outlet of middle warm air preheater (12) is connected by pipeline with the secondary air inlet of high-temperature air preheater (10);The secondary air inlet of high-temperature air preheater (10) is no longer directly connected with the Secondary Air outlet of air preheater (7).
4. according to a kind of air classification preboiler claimed in claim 3, it is characterized in that: middle warm air preheater (12)Also be provided with wind heating surface one time, a wind outlet of wind inlet of middle warm air preheater (12) and air preheater (7)Be connected by pipeline, a wind outlet of middle warm air preheater (12) is connected with a wind-heat wind pipeline of boiler body (1).
5. according to a kind of air classification preboiler claimed in claim 4, it is characterized in that: high-temperature air preheater (10)Also be provided with wind heating surface one time, wind inlet of high-temperature air preheater (10) and middle warm air preheater (12) are onceWind outlet is connected by pipeline, a wind outlet of high-temperature air preheater (10) and a wind-heat airduct of boiler body (1)Road is connected; A wind of middle warm air preheater (12) exports a wind-heat wind pipeline phase no longer direct and boiler body (1)Connect.
6. according to a kind of air classification preboiler described in the arbitrary claim of claim 1～5, it is characterized in that: this skyGas classification preboiler also comprises dust catcher device (13) and desulfurizing tower (14), and dust catcher device (13) is arranged in air preheatIn device (7) back-end ductwork afterwards, desulfurizing tower (14) is arranged in dust catcher device (13) back-end ductwork afterwards, is removingBetween dirt apparatus (13) and desulfurizing tower (14), the preposition air preheater of Secondary Air (15) is set; The preposition air preheat of Secondary AirThe secondary air inlet of device (15) is connected with pressure fan outlet conduit (8), the Secondary Air of the preposition air preheater of Secondary Air (15)Outlet is connected by pipeline with the secondary air inlet of air preheater (7); The secondary air inlet of air preheater (7) no longer withPressure fan outlet conduit (8) is directly connected.
7. according to a kind of air classification preboiler described in the arbitrary claim of claim 1～5, it is characterized in that: this skyGas classification preboiler also comprises dust catcher device (13) and desulfurizing tower (14), and dust catcher device (13) is arranged in air preheatIn device (7) back-end ductwork afterwards, desulfurizing tower (14) is arranged in dust catcher device (13) back-end ductwork afterwards, is removingBetween dirt apparatus (13) and desulfurizing tower (14), a preposition air preheater of wind (16) is set, a preposition air preheat of windA wind inlet of device (16) is connected with primary air fan outlet conduit (9), and a preposition air preheater of wind (16) onceWind outlet is connected by pipeline with a wind inlet of air preheater (7); A wind inlet of air preheater (7) no longerDirectly be connected with primary air fan outlet conduit (9).
8. according to a kind of air classification preboiler claimed in claim 6, it is characterized in that: dust catcher device (13) withA preposition air preheater of wind (16) is also set between desulfurizing tower (14), and a preposition air preheater of wind (16) is along flue gasThe preposition air preheater of flow direction and Secondary Air (15) is arranged in parallel, or arranged in series, or series-parallel connection is arranged; Before a windA wind inlet putting air preheater (16) is connected with primary air fan outlet conduit (9), a preposition air preheater of wind (16)The outlet of wind be connected by pipeline with a wind inlet of air preheater (7); A wind of air preheater (7) entersMouth is no longer directly connected with primary air fan outlet conduit (9).
9. according to a kind of air classification preboiler described in the arbitrary claim of claim 1～5, it is characterized in that: this skyGas classification preboiler also comprises the Secondary Air blower fan (17) of bleeding, and described Secondary Air is bled blower fan (17) by pipeline and airThe Secondary Air outlet of preheater (7), middle warm air preheater (12) or high-temperature air preheater (10) is connected, and by pipeRoad is connected with pressure fan outlet conduit (8).
10. according to a kind of air classification preboiler described in the arbitrary claim of claim 1～5, it is characterized in that: shouldAir classification preboiler also comprises the wind blower fan (18) of bleeding, a described wind bleed blower fan (18) by pipeline from skyA wind outlet extension heat one of air preheater (7), middle warm air preheater (12) or high-temperature air preheater (10)Inferior wind, and be connected with primary air fan outlet conduit (9) by pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521046642.1U CN205245141U (en) | 2015-12-15 | 2015-12-15 | Air classification preboiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521046642.1U CN205245141U (en) | 2015-12-15 | 2015-12-15 | Air classification preboiler |
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| Publication Number | Publication Date |
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| CN205245141U true CN205245141U (en) | 2016-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521046642.1U Expired - Fee Related CN205245141U (en) | 2015-12-15 | 2015-12-15 | Air classification preboiler |
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| CN (1) | CN205245141U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444148A (en) * | 2015-12-15 | 2016-03-30 | 北京中电恒博科技有限公司 | Graded air preheating boiler |
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2015
- 2015-12-15 CN CN201521046642.1U patent/CN205245141U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105444148A (en) * | 2015-12-15 | 2016-03-30 | 北京中电恒博科技有限公司 | Graded air preheating boiler |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160518 Termination date: 20161215 |
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| CF01 | Termination of patent right due to non-payment of annual fee |