CN204313486U - System using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium - Google Patents
System using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium Download PDFInfo
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- CN204313486U CN204313486U CN201420729121.5U CN201420729121U CN204313486U CN 204313486 U CN204313486 U CN 204313486U CN 201420729121 U CN201420729121 U CN 201420729121U CN 204313486 U CN204313486 U CN 204313486U
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Abstract
The utility model provides a kind of system and method using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium, comprise steam turbine, condenser, air inlet adjustment valve, steam air heater and water pump, be connected by pipeline between steam turbine with condenser, pick out a road in the throat of condenser and take out exhaust steam pipeline, be provided with air inlet adjustment valve taking out on exhaust steam pipeline, take out exhaust steam pipeline to be connected with the steam side import of steam air heater, the condensate outlet of steam air heater is connected with water pump.The exhaust steam amount entering steam air heater is controlled by the air inlet adjustment valve taken out on exhaust steam pipeline as required.Part exhaust steam in steam turbine is introduced Boiler Air Heater's as thermal medium by this system, be used for heating the cold air of air preheater import, effectively make use of the heat of exhaust steam, improve unit efficiency, exhaust steam amount simultaneously owing to entering condenser reduces, reduce the thermic load of condenser, be conducive to reducing turbine back pressure, thus further raising unit efficiency.
Description
Technical field
The present invention relates to a kind of system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium, belong to coal-burning power plant's technical field of waste heat utilization.
Background technology
The effect of power station steam air heater is the temperature improving air preheater entrance cold air, makes air preheater cold section of wall temperature of heated surface higher than flue gas acid dew point temperature, alleviates cold end corrosion.Steam air heater of utility boiler is a tubing heat exchanger, and the outer cold medium of pipe is air, and in pipe, thermal medium is steam, and in steam air heater, cold and hot medium carries out exchange heat, and heat is passed to air by steam, reaches the object improving air themperature.The thermal medium of conventional coal-fired plant boiler steam air heater is that steam turbine low-pressure draws gas, and needs the steam consuming certain flow, adds unit heat consumption rate.
The structure of traditional steam air heater of utility boiler belongs to prior art, such as in document CN200979291Y, disclose a kind of Steam Air Heater Using For Station Boiler, some spiral fin coils are set in framework, form several groups of spiral-finned tube bundle of cross arrangement, header is installed on framework, lower collecting box is installed below, the upper/lower terminal of spiral fin coil is communicated with upper and lower header respectively, in spiral fin coil, form steam channel, in the outside of spiral fin coil, the inner chamber of framework forms air duct to be heated.Side monolithic is set on the surface of the both sides of framework, middle single-slice is set on the surface of centre.Upper header arranges steam inlet, hydrophobic outlet is set in the bottom of framework.On framework, suspension ring are set.Spiral fin coil is formed by around the helical fin on pipeline.During work, steam enters in spiral fin coil 5 from steam inlet, and air to be heated passes through between spiral fin coil 5, and heat conducts to helical fin 12 from pipeline 13, and helical fin 12 is by radivection air.The features such as according to duct dimension, can arrange side monolithic in the both sides of framework during use, arrange some middle single-slices in centre, it is good that this arrangement has heat-transfer effect, and resistance is little, sturdy and durable, and installation and maintenance are convenient.Spiral-finned tube bundle can adopt overall zinc-plated process, can be coated with heat-resistant paint inside and outside framework, and all there is sealing gasket between monolithic in parallel and steam air heater and connection place, air channel, to improve antirust, anti-corrosive and the sealing property of steam air heater.Arrangement form can be selected according to power plant's air channel situation: when air channel is horizontally disposed, can select I type or type III steam air heater, when air channel is perpendicular to Horizon, can select II type steam air heater.Each of steam air heater all has the bolt hole connected, when steam air heater connects with air channel, by flange bolt-connection.Heat exchange element is connected into spiral fin coil by high-frequency resistance welding (HFRW), and this finned tube has compact conformation, and resistance is little, and area of dissipation is large, firm welding, not easily the advantage such as dust stratification.Steam air heater utilizes steam turbine low-pressure to draw gas as thermal source to add hot-air; after the air preheater arrival end employing steam air heater of station boiler; the sulfuric acid corrosion that the oxygen corrosion that causes in preheater metal surface and sulfur trioxide cause can be avoided; the dust stratification of metallic walls is greatly alleviated; reason does not block up the increase that ash causes air inducing resistance; thus greatly extend the service life of air preheater, guarantee the safe operation of unit.
Document CN201531899U discloses a kind of power station boiler dynamic air heater, comprise support frame and be positioned at many groups heat exchange element of support frame, heat exchange element two ends are connected with import and export header respectively, inlet header is connected with inlet tube by admission hollow support axle, and outlet header is connected with outlet by hydrophobic hollow back shaft; The cross section of heat exchange element is parallelogram sturcutre, and heat exchange element short diagonal must be vertical with the heat exchange element minor face of parallelogram shape, and the arrangement of adjacent heat exchange elements into intimate.Admission hollow support axle is connected with import and export pipe by flange respectively with hydrophobic hollow back shaft, and on the flange of admission hollow support central siphon, be provided with the operating grip be connected with heat exchange element.Support frame is imported and exported adpting flange primarily of air channel, is formed the formations such as the support member of the shell body of steam air heater and reinforcement steam air heater rigidity, wherein shell body has import and export axis hole, for preventing leaking out, at axis hole, place arranges sealing gland, be welded with steam air heater at support frame outer wall and prop up device for hoisting, the scene for steam air heater is propped up and is hung; The Main Function of whole support frame is support rotating heat exchange element group and forms wind path wall.Each group of heat exchange element group adopts Flange joint.Heat exchange element is the critical component that steam air heater carries out heat exchange, and its heat exchange area is determined by calculating according to reality; Importing and exporting flange effect is connect steam inlet pipe and white-out water pipe, wherein on admission flange, is welded with operating grip, to facilitate steam air heater rotation process; Admission hollow support axle is as steam tube and guide bearing axle journal, and the effect of water drainage hollow support axle is white-out water pipe and spring bearing axle journal; Inlet header effect is by steam uniform distribution to heat exchange element pipe group, and outlet header effect is that collection is hydrophobic.Heat exchange element is connected with import and export header welding; heat exchange element is rotatable component; for ease of Rotation With Changing thermal element group and reduce cold wind corridor sectional area as much as possible; steam air heater heat exchange element group parallelogram is arranged; reliable for guaranteeing that heat exchange element rotates, heat exchange element diagonal must with become the heat exchange element minor face of parallelogram vertical.Support frame shell is provided with position indicator and dismountable position-limitting pin, in support frame, is provided with position limiting sealed plate.Position indicator is used to indicate the position of heat exchange element; Support frame shell body is provided with position-limitting pin, to avoid the picture occurring that the anglec of rotation is excessive.During operation, steam air heater is in state out of service at high temperature season, wide of heat exchange element is parallel with wind direction, before steam air heater comes into operation, untie the bolt of adpting flange, pull the operating grip of adpting flange, steam air heater heat exchange element is turned over 90 °, then flange is connected, vapour is leaked for avoiding flange, during each operation, the pad of flange should be changed, each group of steam air heater direction of rotation should be consistent, the impact that system is caused significantly is reduced for avoiding resistance, steam air heater is thrown when moving back and should sequentially be carried out, do not allow several groups of heat exchange elements to operate simultaneously, during operation, action should be slow, scene should have operations staff on the scene, and keep in touch with central control room, strict surveillance blast, the change of blower fan electric current.Steam air heater can be arranged in fan air channel outlet or entrance, according to air channel arrangement form, import and export according to steam and flow to, steam air heater heat exchange element adopts following arrangement: (1) is when steam air heater is arranged in horizontal duct, steam air heater can adopt and be arranged vertically, steam is from top to bottom by heat exchange element, and steam is imported and exported position and is on same axis; (2) when steam air heater is arranged in vertical air plenums, steam air heater can adopt and be in tilted layout, and steam from left to right or from front to back by heat exchange element, steam is imported and exported position and is on same axis, and entrance location is higher than exit position.
The exhaust steam heat that steam turbine drains into condenser is one of waste heat loss larger during steam power plant produces.Exhaust steam is condensed into condensate water in condenser with after recirculated water or cooling-air heat exchange, in exhaust steam condensation process, liberated heat is disposed in environment through cooling tower or air cooling blower fan, the heat of loss accounts for about 60% of coal-fired generation heat, becomes the bottleneck that restriction unit efficiency improves.How to utilize exhaust steam in steam turbine heat, be research emphasis and difficult point that residual heat of electric power plant utilizes technical field always.
Summary of the invention
The present invention proposes a kind of system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium.Part exhaust steam in steam turbine is introduced Boiler Air Heater's as thermal medium, be used for heating the cold air of air preheater import, effectively make use of the heat of exhaust steam, improve unit efficiency, exhaust steam amount simultaneously owing to entering condenser reduces, reduce the thermic load of condenser, be conducive to reducing turbine back pressure, thus further increase unit efficiency, exhaust steam amount simultaneously owing to entering condenser reduces, reduce the thermic load of condenser, be conducive to reducing turbine back pressure, thus further raising unit efficiency.
To achieve these goals, the invention provides a kind of system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium, comprise steam turbine, condenser, air inlet adjustment valve, steam air heater and water pump, be connected by pipeline between steam turbine with condenser, pick out a road in the throat of condenser and take out exhaust steam pipeline, be provided with air inlet adjustment valve taking out on exhaust steam pipeline, take out exhaust steam pipeline and be connected with the steam side import of steam air heater, the condensate outlet of steam air heater is connected with water pump.
The exhaust steam amount entering steam air heater is controlled by the air inlet adjustment valve taken out on exhaust steam pipeline as required.
Water pump is communicated with steam turbine condensate system.
Also comprise condensate pump, the water inlet of condensate pump is connected with the delivery port at condenser, and the delivery port of condensate pump is communicated with steam turbine condensate system.
Also comprise blower fan and air preheater, blower fan, to be connected by air duct between steam air heater and air preheater.
A part of exhaust steam in steam turbine after acting enters condenser; Exhaust steam carries out heat exchange with cooling water in condenser, transfers heat to cooling water, and the temperature of cooling water is raised, and simultaneously exhaust steam undergoes phase transition due to heat release, and after heat release, condensation becomes condensate water, and condensate water enters condensate system after condensate pump boosting.
Pick out a road in the throat of condenser and take out the steam side import that exhaust steam pipeline is connected to steam air heater; Air inlet adjustment valve is installed, for adjusting the amount of drawing gas of exhaust steam taking out on exhaust steam pipeline; Part exhaust steam is extracted out by the throat from condenser, by taking out the steam side import of exhaust steam Cemented filling to steam air heater, heat exchange is carried out with cold air in steam air heater, the temperature of cold air is raised, simultaneously exhaust steam undergoes phase transition due to heat release, after heat release, condensation becomes condensate water, enters condensate system, accumulate a road discharge with the condensate water from condenser after water pump boosting.
Cold air enters blower fan, steam air heater is entered after blower fan pressurization, heat exchange is carried out with exhaust steam in steam air heater, after heat exchange cold air temperature raise, that is cold air in steam air heater by exhaust steam preheating, absorb exhaust steam heat after, exhaust steam undergoes phase transition due to heat release, after heat release, condensation becomes condensate water, enters condensate system, accumulate a road discharge with the condensate water from condenser after water pump boosting; And cold air is by after the rising of exhaust steam heating-up temperature, enter the further heat temperature raising of air preheater.
The effect of taking out the air inlet adjustment valve on exhaust steam pipeline controls to adjust the exhaust steam amount entering steam air heater as required.When the cold air flows change temperature entering the cold air of air preheater that is large or that need of blower fan conveying is high time, strengthen the aperture of air inlet adjustment valve, make to become large by the exhaust steam flow of air inlet adjustment valve, make more exhaust steam enter steam air heater and participate in heat exchange, cold air absorbs the heat of more exhaust steam, thus the temperature of cold air is raised further; At this moment the exhaust steam flow entering condenser diminishes, and in exhaust steam condensation process, liberated heat is disposed to through cooling tower or air cooling blower fan that the heat that loses in environment is also just corresponding to diminish.
When the cold air flows of blower fan conveying diminish or enter the temperature of cold air of steam air heater natively high time, the aperture of air inlet adjustment valve can be reduced, make to be diminished by the exhaust steam flow of air inlet adjustment valve, make less exhaust steam enter steam air heater and participate in heat exchange, cold air absorbs the heat of less exhaust steam; At this moment the exhaust steam flow entering condenser is large.
Steam air heater can adopt various ways, and in the air channel before being typically arranged on pressure fan or after pressure fan, comprise support frame and be positioned at many groups heat exchange element of support frame, heat exchange element two ends are connected to inlet header and outlet header.
Steam air heater is placed in resistance and the blower fan power consumption that blower fan Feng Zhong road can increase air channel; Simultaneously because the air that sucks blower fan is due to containing a large amount of impurity, these impurity are general after entering air channel to be difficult to by the fine and closely woven heat exchange element of steam air heater, their major part depositions are attached on the heat exchange element of steam air heater windward side, along with the accumulation of time, Impurity deposition gets more and more, steam air heater resistance is also increasing, and blower fan power consumption also increases further.Therefore in the design in air channel, usually need the drag losses that reduction steam air heater as far as possible causes air channel.
The present invention also provides a kind of method using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium, comprise steam turbine, condenser, air inlet adjustment valve, steam air heater and water pump, be connected by pipeline between steam turbine with condenser, pick out a road in the throat of condenser and take out exhaust steam pipeline, be provided with air inlet adjustment valve taking out on exhaust steam pipeline, take out exhaust steam pipeline to be connected with the steam side import of steam air heater, the condensate outlet of steam air heater is connected with water pump; Exhaust steam in steam turbine after acting enters condenser; Part exhaust steam becomes condensate water after condensation heat in condenser; Another part exhaust steam is by taking out exhaust steam pipeline and air inlet adjustment valve enters steam air heater, and exhaust steam is condensed into water after heat release in steam air heater, after water pump boosting, enter condensate system; Cold air enters steam air heater after blower fan pressurization, enters the further heat temperature raising of air preheater in steam air heater by exhaust steam after being heated.
The exhaust steam amount entering steam air heater is controlled by the control valve taken out on exhaust steam pipeline as required.
Accompanying drawing explanation
Fig. 1 is the overall schematic using exhaust steam in steam turbine as the system of steam air heater of utility boiler thermal medium described in the application.
Detailed description of the invention
As shown in Figure 1, steam turbine 1, air inlet adjustment valve 2, steam air heater 3, water pump 4 and condenser 5 is comprised using exhaust steam in steam turbine as the system of steam air heater of utility boiler thermal medium, be connected by pipeline between steam turbine 1 with condenser 5, pick out a road in the throat of condenser 5 and take out exhaust steam pipeline, be provided with air inlet adjustment valve 2 taking out on exhaust steam pipeline, take out exhaust steam pipeline to be connected with the steam side import of steam air heater 3, the condensate outlet of steam air heater 3 is connected with water pump 4.Water pump 4 is communicated with steam turbine condensate system.
This system also comprises condensate pump 6, and the water inlet of condensate pump 6 is connected with the delivery port at condenser 5, and the delivery port of condensate pump 6 is communicated with steam turbine condensate system.
This system also comprises blower fan 7 and air preheater 8, blower fan 7, is connected by air duct between steam air heater 3 and air preheater 8.
The method of work of this system is as follows:
A part of exhaust steam in steam turbine 1 after acting enters condenser 5, heat exchange is carried out with cooling water in condenser 5, transfer heat to cooling water, the temperature of cooling water is raised, exhaust steam simultaneously becomes condensate water after condensation heat in condenser 5, and condensate water enters condensate system after condensate pump 6 boosts.
Pick out a road in the throat of condenser 5 and take out the steam side import that exhaust steam pipeline is connected to steam air heater 3; Air inlet adjustment valve 2 is installed, for adjusting the amount of drawing gas of exhaust steam taking out on exhaust steam pipeline; Part exhaust steam is extracted out by the throat from condenser, by taking out the steam side import of exhaust steam Cemented filling to steam air heater, heat exchange is carried out with cold air in steam air heater 3, the temperature of cold air is raised, simultaneously exhaust steam undergoes phase transition due to heat release, after heat release, condensation becomes condensate water, enters condensate system, accumulate a road discharge with the condensate water from condenser after water pump 4 boosts.
Cold air enters blower fan 7, steam air heater 3 is entered after blower fan 7 pressurizes, heat exchange is carried out with exhaust steam in steam air heater 3, after heat exchange cold air temperature raise, that is cold air in steam air heater by exhaust steam preheating, absorb exhaust steam heat after, exhaust steam undergoes phase transition due to heat release, after heat release, condensation becomes condensate water, enters condensate system, accumulate a road discharge with the condensate water from condenser after water pump boosting; And cold air is by after the rising of exhaust steam heating-up temperature, enter the further heat temperature raising of air preheater.
The effect of taking out the air inlet adjustment valve on exhaust steam pipeline controls to adjust the exhaust steam amount entering steam air heater as required.When the cold air flows change temperature entering the cold air of air preheater that is large or that need of blower fan conveying is high time, strengthen the aperture of air inlet adjustment valve, make to become large by the exhaust steam flow of air inlet adjustment valve, make more exhaust steam enter steam air heater and participate in heat exchange, cold air absorbs the heat of more exhaust steam, thus the temperature of cold air is raised further; At this moment the exhaust steam flow entering condenser diminishes, and in exhaust steam condensation process, liberated heat is disposed to through cooling tower or air cooling blower fan that the heat that loses in environment is also just corresponding to diminish.
When the cold air flows of blower fan conveying diminish or enter the temperature of cold air of steam air heater natively high time, the aperture of air inlet adjustment valve can be reduced, make to be diminished by the exhaust steam flow of air inlet adjustment valve, make less exhaust steam enter steam air heater and participate in heat exchange, cold air absorbs the heat of less exhaust steam; At this moment the exhaust steam flow entering condenser is large.
Steam air heater can adopt various ways, and in the air channel before being typically arranged on pressure fan or after pressure fan, comprise support frame and be positioned at many groups heat exchange element of support frame, heat exchange element two ends are connected to inlet header and outlet header.
Steam air heater is placed in resistance and the blower fan power consumption that blower fan Feng Zhong road can increase air channel; Simultaneously because the air that sucks blower fan is due to containing a large amount of impurity, these impurity are general after entering air channel to be difficult to by the fine and closely woven heat exchange element of steam air heater, their major part depositions are attached on the heat exchange element of steam air heater windward side, along with the accumulation of time, Impurity deposition gets more and more, steam air heater resistance is also increasing, and blower fan power consumption also increases further.Therefore in the design in air channel, usually need the drag losses that reduction steam air heater as far as possible causes air channel.
The present invention adopts exhaust steam in steam turbine heat to heat air preheater import cold air, by the heat recovery and utilization of this part exhaust steam, eliminates the extracted steam from turbine in existing steam air heater system, improves unit efficiency.
The present invention has that system is simple, exhaust steam residual heat cascade utilization, can improve the advantages such as unit efficiency.
Systems approach of the present invention is illustrated with reference to exemplary process figure and explains.Based on description above, additional variants and modifications is apparent for those of ordinary skills, and within the protection domain all falling into the application, and protection scope of the present invention is determined by appended claim.
Claims (5)
1. the system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium, comprise steam turbine, condenser, air inlet adjustment valve, steam air heater and water pump, be connected by pipeline between steam turbine with condenser, pick out a road in the throat of condenser and take out exhaust steam pipeline, be provided with air inlet adjustment valve taking out on exhaust steam pipeline, take out exhaust steam pipeline to be connected with the steam side import of steam air heater, the condensate outlet of steam air heater is connected with water pump.
2. the system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium as claimed in claim 1, it is characterized in that, the exhaust steam amount entering steam air heater is controlled by the air inlet adjustment valve taken out on exhaust steam pipeline as required.
3. the system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium as claimed in claim 2, it is characterized in that, water pump is communicated with steam turbine condensate system.
4. the system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium as described in any one of claim 1-3, it is characterized in that, also comprise condensate pump, the water inlet of condensate pump is connected with the delivery port at condenser, and the delivery port of condensate pump is communicated with steam turbine condensate system.
5. the system using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium as claimed in claim 4, is characterized in that, also comprise blower fan and air preheater, blower fan, is connected by air duct between steam air heater and air preheater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420729121.5U CN204313486U (en) | 2014-11-28 | 2014-11-28 | System using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420729121.5U CN204313486U (en) | 2014-11-28 | 2014-11-28 | System using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium |
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| Publication Number | Publication Date |
|---|---|
| CN204313486U true CN204313486U (en) | 2015-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420729121.5U Expired - Fee Related CN204313486U (en) | 2014-11-28 | 2014-11-28 | System using exhaust steam in steam turbine as steam air heater of utility boiler thermal medium |
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| CN (1) | CN204313486U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027558A (en) * | 2021-04-09 | 2021-06-25 | 北京慧峰仁和科技股份有限公司 | Efficient energy-saving anti-freezing air heater system and method |
-
2014
- 2014-11-28 CN CN201420729121.5U patent/CN204313486U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113027558A (en) * | 2021-04-09 | 2021-06-25 | 北京慧峰仁和科技股份有限公司 | Efficient energy-saving anti-freezing air heater system and method |
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| Date | Code | Title | Description |
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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: 20150506 Termination date: 20151128 |