CN105042621A - Multichannel rotating type air preheater - Google Patents
Multichannel rotating type air preheater Download PDFInfo
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- CN105042621A CN105042621A CN201510406159.8A CN201510406159A CN105042621A CN 105042621 A CN105042621 A CN 105042621A CN 201510406159 A CN201510406159 A CN 201510406159A CN 105042621 A CN105042621 A CN 105042621A
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- air
- flue gas
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- air preheater
- temperature
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- 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
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Abstract
The invention provides a multichannel rotating type air preheater which comprises an air preheater shell, a rotor arranged in the shell, flue gas channels, air channels and sealing plates arranged between every two adjacent channels. At least two flue gas channels are arranged, and the number of the air channels is larger than or equal to that of the flue gas channels. The air channels are formed between every two adjacent flue gas channels, that is, the flue gas channels are partitioned by the air channels. Corresponding flue gas inlet/outlet connection plates and air inlet/outlet connection plates correspond to the flue gas channels and the air channels. By means of the multichannel rotating type air preheater, hot flue gas and cold air pass through the rotor of the air preheater frequently, so that lower smoke temperature peripheral deviation and air temperature peripheral deviation are achieved, the lowest exhaust smoke temperature and the lowest rotor temperature are increased under the same exhaust smoke temperature condition, it is avoided that part of flue gas in the flue gas channels of the air preheater enters a dew point area too early, and the problems of dew formation, ash sticking, corrosion, blocking and the like of a cold-end heat storage piece are reduced. Through optimal design, the temperature of exhaust smoke of a boiler can be further lowered, and the efficiency of the boiler is improved.
Description
Technical field
The present invention relates to the technology that a kind of thermal power plant back-end ductwork utilizes Low Temperature Thermal flue gas to heat cold air, particularly adopt the technology that rotary regenerative air preheater heats air.
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, have just like become the history important task that all trades and professions researcher bears.And the support industry that electric power constantly improves as industrial development and social economy, the coal resources of wherein heat power station consumption account for the half of coal total flow, and energy resource structure is in very important position.
For thermal power generation unit, under the condition of same steam parameter, boiler efficiency is the most critical factor affecting unit coal consumption.Under the present art, boiler design efficiency is mostly more than 92%, and in the loss of its efficiency, flue gas loss still stands in the breach.Flue gas loss is difficult to the reason declined, and is subject to the restriction of conventional rotary regenerative air preheater exhaust gas temperature deviation and hot air outlet temperature deviation on the one hand.Conventional rotary regenerative air preheater cigarette, the wind outlet temperature difference directly cause rotary regenerative air preheater heat transfer temperature and pressure to decline, and Air Preheater Heating Surface must be caused to amass to be increased, thus increases air preheater construction cost; On the other hand, the gas temperature windage larger due to exhaust gas temperature outlet exists (conventional may have more than 20 DEG C), will ensure during design that the minimum warm area of Air Preheater Heating Surface is not in cold end corrosion temperature range, this makes the design of air preheater exhaust gas temperature higher than the temperature requirement of cold end corrosion one must go out bigger numerical as far as possible.The restriction of comprehensive several respects above, the exhaust gas temperature in current thermal power plant generally all designs at about 130 DEG C.
Along with entire society is to the attention increasingly of energy-saving and emission-reduction in recent years, State-level puts into effect more and more more and more tighter energy-saving and emission-reduction policy, and Thermal Power Generation Industry starts to manage the auxiliary efficiency of raising machine stove from all angles.Aspect is utilized for fume afterheat, owing to being subject to the defective effect of conventional rotary regenerative air preheater, directly dare not increase heating surface area, reduce exhaust gas temperature, industry adopts the ways such as low-level (stack-gas) economizer, middle temperature economizer, low low-level (stack-gas) economizer mostly, utilize fume afterheat to be used for heat-setting water (or part feedwater) drawing gas with alternative steam turbine, and then improve the workmanship ability of steam turbine.But due to rotary regenerative air preheater workmanship ability lower (, about 20%, heated feed water is about 50% for the efficiency of heat-setting water), directly cause the utilization rate of waste heat of flue gas not high.
Summary of the invention
The object of this invention is to provide a kind of multichannel rotary regenerative air preheater, be intended to the limitation breaking through the utilization of domestic residual heat of smoke from boiler of fossil power plant, make full use of fume afterheat, significantly eliminate the cigarette of rotary regenerative air preheater, the wind outlet temperature difference, for reducing exhaust gas temperature further, directly improving boiler efficiency provides technical support.
Technical scheme of the present invention is as follows:
A kind of multichannel rotary regenerative air preheater, the sealing plate comprising air preheater shell, setting rotor in the enclosure, exhaust gases passes, air duct and be arranged between adjacency channel, it is characterized in that: described exhaust gases passes at least comprises two passages, the quantity of air duct is more than or equal to the quantity of exhaust gases passes, arranges air duct between every two exhaust gases passes.
Preferably, exhaust gases passes comprises the first exhaust gases passes and the second exhaust gases passes, and air duct comprises the first air duct and the second air duct, and air duct and exhaust gases passes interval are arranged.
The present invention compared with prior art, has the following advantages and the technique effect of high-lighting:
1. the invention enables air preheater rotor frequently through heat smoke and cold air, reduce the circumferential temperature deviation of flue gas in each flue, designed by flow matches, greatly reduce the population deviation of exhaust gas temperature, thus avoid partial fume in air preheater flue to enter dew point district too early.2. the present invention also makes the circumference of the wind-warm syndrome in each air duct deviation greatly reduce, and by the flow matches corresponding to flue design, greatly reduces the population deviation of hot-blast outlet temperature.3. by the reduction greatly to the circumferential deviation of cigarette temperature and wind-warm syndrome circumference deviation, improve the heat transfer temperature difference of flue gas and air, improve the heat transfer efficiency of air preheater heat storage plate, reduce the relative construction cost of air preheater.4. the present invention is by correcting the deviation of exhaust gas temperature, reduces the thermal deviation of air preheater heat storage plate direction of rotation further, avoids cold junction heat storage plate to condense, be stained with the problem such as ash, burn into blocking.5. by enforcement of the present invention, under the prerequisite that minimum local exhaust gas temperature is identical, further exhaust gas temperature can be designed downwards, directly improves boiler efficiency.
Accompanying drawing explanation
Fig. 1 is a kind of rotary regenerative air preheater schematic diagram of routine.
Fig. 2 is a kind of multichannel rotary regenerative air preheater case study on implementation schematic diagram of the present invention.
In figure: 1 ?shell; 2 ?rotor; 3 ?sealing plate; 4 ?exhaust gases passes; 4a ?the first exhaust gases passes; 4b ?the second exhaust gases passes; 5a ?First air passage; 5b ?secondary air channel; 6a ?fume side first area; 6b ?fume side second area; 7a ?air side first area; 7b ?air side second area.
Detailed description of the invention
Below in conjunction with accompanying drawing, operation principle of the present invention, concrete structure and a kind of implementation method are described further:
Regular air preheater has the structure such as Liang Fengcang, three Fen Cang and four point storehouse, and two points of storehouses are that flue gas, air walk a passage separately; Three points of storehouses are that First air and Secondary Air separately occupy two air ducts, and flue gas only walks a passage; Still comprise an exhaust gases passes in four points of storehouses, other three are respectively First air passage, secondary air channel and fluidized wind passage (for Properties of CFB) etc.The direct dynamic and static gaps place of each passage is provided with sealing device.
Fig. 1 is a kind of trisector air heater structural representation of routine, and its basic structure comprises air preheater shell 1, arranges rotor 2, sealing plate 3, exhaust gases passes 4 and First air passage 5a in the enclosure and secondary air channel 5b.Flue gas passes through the rotor heat storage plate that exhaust gases passes 4 heats this region as illustrated with black arrow, and air is if dotted arrow is from bottom to top by being heated by the rotor heat storage plate in this region after First air passage 5a and secondary air channel 5b.Owing to being gradually cooled as it passes through the cooler in rotating past air side clockwise by the rotor heated, then first the air section temperature of rotor of process is high, then the air section temperature of rotor of process is low, thus cause 7a place, the air side first area air of first process higher by the temperature T7a heated, after through air side second area 7b place air lower by the temperature T72 heated.Rotor after cooled turns through fume side more gradually clockwise, and then is gradually heated by the sonochemical activity; The fume side temperature of rotor of first process can be caused as a same reason low, flue-gas temperature declines fast, after through region temperature of rotor higher, flue-gas temperature declines slow, thus cause the flue-gas temperature T6a of the fume side first area 6a of first process lower, after through the flue-gas temperature T6b height of fume side second area 6b high, thus the circumferential deviation of cigarette temperature causing air preheater to export.
Fig. 2 is the structural representation of a kind of multichannel rotary regenerative air preheater case study on implementation of the present invention, its basic structure comprises sealing plate 3, exhaust gases passes 4 and air duct between air preheater shell 1, setting rotor 2 in the enclosure, adjacent two passages, described exhaust gases passes at least comprises two passages, the quantity of air duct is greater than the quantity equaling exhaust gases passes, arranges air duct between every two exhaust gases passes.In the present embodiment, air duct comprises the first air duct 5a and the second air duct 5b; Described exhaust gases passes comprises the first exhaust gases passes 4a and the second exhaust gases passes 4b, and air duct and exhaust gases passes interval are arranged.Exhaust gases passes is separated by air duct, and corresponding smoke entrance connecting plate, air ports connecting plate are also corresponding with exhaust gases passes and air duct, and the dynamic and static gaps place between rotor to every two passages arranges corresponding SLD.Because rotor circumferential stroke (angle) is in each channel less, in each passage, the circumferential deviation of the gentle wind-warm syndrome of cigarette is all less, by rational each channel capacity matched design, can ensure that the difference of overall exhaust gas temperature deviation T61 and T62 is less, overall air exit temp deviation T71 and the difference of T72 also less.Thus larger heat transfer temperature and pressure can be realized.And the less smoke evacuation temperature difference can ensure design lower exhaust gas temperature and do not cause cold end corrosion problem.
Claims (2)
1. a multichannel rotary regenerative air preheater, the sealing plate (3) comprising air preheater shell (1), setting rotor (2) in the enclosure, exhaust gases passes (4), air duct and be arranged between adjacency channel, it is characterized in that: described exhaust gases passes at least comprises two passages, the quantity of air duct is more than or equal to the quantity of exhaust gases passes, arranges air duct between every two exhaust gases passes.
2. according to a kind of multichannel rotary regenerative air preheater according to claim 1, it is characterized in that: exhaust gases passes comprises the first exhaust gases passes (4a) and the second exhaust gases passes (4b), air duct comprises the first air duct (5a) and the second air duct (5b), and air duct and exhaust gases passes interval are arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510406159.8A CN105042621A (en) | 2015-07-10 | 2015-07-10 | Multichannel rotating type air preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510406159.8A CN105042621A (en) | 2015-07-10 | 2015-07-10 | Multichannel rotating type air preheater |
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| Publication Number | Publication Date |
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| CN105042621A true CN105042621A (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510406159.8A Pending CN105042621A (en) | 2015-07-10 | 2015-07-10 | Multichannel rotating type air preheater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107726356A (en) * | 2017-11-21 | 2018-02-23 | 杭州新际能源科技有限公司 | More points of storehouse self-cleaning corrosion-and blocking-prevention rotary regenerative air preheaters |
| CN112607943A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired power plant desulfurization wastewater treatment system and method based on four-bin air preheater |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6488024A (en) * | 1987-09-29 | 1989-04-03 | Mitsubishi Heavy Ind Ltd | Rotary regeneration type air preheater |
| US5678625A (en) * | 1993-01-23 | 1997-10-21 | Apparatebau Rothemuhle Brandt & Kritzler Gmbh | Method and apparatus for a regenerative heat exchanger for the treatment of pollutant-containing waste gases |
| JP2001304540A (en) * | 2000-04-21 | 2001-10-31 | Nippon Steel Corp | Rotary heat-exchanger |
| CN201909334U (en) * | 2010-11-22 | 2011-07-27 | 章礼道 | Asymmetric quarter-sector rotary air preheater |
| CN204829997U (en) * | 2015-07-10 | 2015-12-02 | 清华大学 | Multichannel regenerative air preheater |
-
2015
- 2015-07-10 CN CN201510406159.8A patent/CN105042621A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6488024A (en) * | 1987-09-29 | 1989-04-03 | Mitsubishi Heavy Ind Ltd | Rotary regeneration type air preheater |
| US5678625A (en) * | 1993-01-23 | 1997-10-21 | Apparatebau Rothemuhle Brandt & Kritzler Gmbh | Method and apparatus for a regenerative heat exchanger for the treatment of pollutant-containing waste gases |
| JP2001304540A (en) * | 2000-04-21 | 2001-10-31 | Nippon Steel Corp | Rotary heat-exchanger |
| CN201909334U (en) * | 2010-11-22 | 2011-07-27 | 章礼道 | Asymmetric quarter-sector rotary air preheater |
| CN204829997U (en) * | 2015-07-10 | 2015-12-02 | 清华大学 | Multichannel regenerative air preheater |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107726356A (en) * | 2017-11-21 | 2018-02-23 | 杭州新际能源科技有限公司 | More points of storehouse self-cleaning corrosion-and blocking-prevention rotary regenerative air preheaters |
| CN112607943A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired power plant desulfurization wastewater treatment system and method based on four-bin air preheater |
| CN112607943B (en) * | 2020-12-16 | 2023-04-18 | 中国华能集团清洁能源技术研究院有限公司 | Coal-fired power plant desulfurization wastewater treatment system and method based on four-bin air preheater |
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Application publication date: 20151111 |