CN106051805B - A kind of residual neat recovering system and method using smoke discharging residual heat as steam air heater heat source - Google Patents
A kind of residual neat recovering system and method using smoke discharging residual heat as steam air heater heat source Download PDFInfo
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- CN106051805B CN106051805B CN201610474366.1A CN201610474366A CN106051805B CN 106051805 B CN106051805 B CN 106051805B CN 201610474366 A CN201610474366 A CN 201610474366A CN 106051805 B CN106051805 B CN 106051805B
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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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- 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
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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
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/15081—Reheating of flue gases
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- General Engineering & Computer Science (AREA)
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Abstract
The residual neat recovering system and method that the invention discloses a kind of using smoke discharging residual heat as steam air heater heat source, its low-level (stack-gas) economizer connect to form first circulation circuit by pipeline with steam air heater, the inlet duct of low-level (stack-gas) economizer is equipped with circulating pump, and the inlet duct of steam air heater is equipped with steam air heater inlet regulating valve；The recirculated water side of low-level (stack-gas) economizer and condensation water heater connects to form second circulation circuit by pipeline, the condensed water side of condensation water heater and low-pressure heater are connected in parallel by pipeline, and the condensed water connecting pipe between the low-pressure heater is provided with booster pump.The advantages of system and method remain steam air heater and mitigate air preheater low-temperature corrosion, and low-level (stack-gas) economizer recycles boiler exhaust gas waste heat, reduces steam turbine power generation coal consumption；Meanwhile overcoming steam air heater and expending the shortcomings that steam turbine low-pressure steam extraction increases turbine heat rate, exhaust gas temperature rises reduction boiler thermal efficiency, moreover, solving the problems, such as that low-level (stack-gas) economizer pipeline system cost is high, operational reliability is demanding.
Description
Technical field
The present invention relates to be related to a kind of steam air heater heating system, and in particular to one kind is warmed up using smoke discharging residual heat as station boiler
The residual neat recovering system and method for wind device heat source, belong to coal-burning power plant's field of waste heat utilization.
Background technique
It in thermal power plant, influences in every loss of boiler efficiency, the heat loss due to exhaust gas proportion of boiler is maximum.One
As in the case of, exhaust gas temperature is every to increase by 10 DEG C, and heat loss due to exhaust gas increases by 0.5%~0.8%, much more corresponding consumption coals 1.2%~
2.4%.
The many coal-fired plant boiler exhaust gas temperatures in current China are generally higher than design value, efficiency of generating unit is caused to decline,
Dust collection efficiency decline, coal consumption increase.For this overheating problem, domestic unit, which generallys use, installs low-level (stack-gas) economizer mode time additional
Smoke discharging residual heat is received, and in order to realize the effect for reducing coal consumption, the side Qi Shui is usually connected in the low-pressure heating of Steam Turbine Regenerative System
Device part, smoke discharging residual heat are recycled to the low adding system of steam turbine by pipe-line system, increase steam turbine acting, and then reduce coal consumption for power generation.
And have the thermal power plant in low temperature season area for being in, to prevent boiler tail is heated from low-temperature corrosion, boiler occurs
Pressure fan, primary air fan can largely improve the temperature of air preheater entrance cold air by way of steam air heater is arranged, and make
It obtains cold section of wall temperature of heated surface of air preheater and is higher than flue gas acid dew point temperature, mitigate low-temperature corrosion.Conventional coal-fired plant boiler is warm
The heat source of wind device is steam turbine low-pressure steam extraction, and steam air heater is a tubing heat exchanger, and outer tube cold medium is air, manages interior heat and is situated between
Matter is steam, and cold and hot medium carries out heat exchange in steam air heater, and heat is transmitted to air by steam, reaches raising air themperature
Purpose.Steam air heater generally draws heat source of a part of steam extraction as steam air heater from steam turbine by adding steam pipework, to steam
Vapour is always the Normal practice of fired power generating unit in industry as the heat source of steam air heater, because technology relative maturity does not have always innovation.
Low-level (stack-gas) economizer is added in air preheater outlet to recycle smoke discharging residual heat and the mode to heat steam turbine condensed water has
Solve the problems, such as to effect that domestic boiler of power plant exhaust gas temperature is excessively high at present.However, the heat recycled at present is generally all by condensing
Water is recycled to the low add-back hot systems of steam turbine as thermal medium, since the residual neat recovering system is incorporated to power plant steam turbine condensation water system
System, system running pressure is higher, high for the reliability requirement of equipment, and the cost is relatively high for equipment operation maintenance, while steam turbine
Farther out, the pipe-line system for conveying thermal medium generally has several hundred rice, pipeline higher cost to distance behind room and furnace.
The steam air heater heat source being arranged for mitigating air preheater low-temperature corrosion leads to typically from steam turbine steam extraction or auxiliary steam
Normal such steam generally has 100 DEG C or so of the degree of superheat, and usual steam condensation exothermic coefficient compares superheated steam exothermic coefficient
It is many higher, therefore to improve the exchange capability of heat of steam air heater, steam air heater steam cooling generally is given with desuperheating water, reduces steam mistake
Temperature makes steam close temperature close to full.Not only it is underutilized the quality of steam air heater steam supply in this way, but also because being given with condensed water
Steam air heater cooling reduces condensing water flow, reduces Turbo-generator Set effectiveness of regenerator.The setting of steam air heater consumes again simultaneously
The steam of certain flow increases unit heat consumption rate.Although coming into operation for steam air heater alleviates the low-temperature corrosion of air preheater, by
It is improved in inlet air temperature, air preheater heat transfer temperature difference reduces, and exhaust gas temperature rises, boiler efficiency decline, in turn results in full factory's power generation
Efficiency decline.
Above-mentioned low-level (stack-gas) economizer and steam air heater both seem incoherent technology there is a problem that it is respective.Firstly, warm
Although the setting of wind device mitigates low-temperature corrosion, there are the consuming of heat source stream, exhaust gas temperature rising, heat wastes etc. to ask
Topic；Secondly, low-level (stack-gas) economizer can solve the problems, such as that exhaust gas temperature is excessively high, the heat of recycling by thermal medium be delivered to steam turbine it is low plus
System increases steam turbine acting, however system running pressure is high, equipment dependability requires high, pipeline length, at high cost.
Therefore, high air preheater low-temperature corrosion, exhaust gas temperature, the consuming of steam air heater steam, Conventional cryogenic how to be overcome to save
The defects of coal device pipeline is at high cost is those skilled in the art's technical issues that need to address.
Summary of the invention
The object of the present invention is to provide a kind of using smoke discharging residual heat as the residual neat recovering system of steam air heater heat source.The system is protected
Steam air heater has been stayed to mitigate air preheater low-temperature corrosion, low-level (stack-gas) economizer recycles boiler exhaust gas waste heat, reduces the excellent of steam turbine power generation coal consumption
Point；Meanwhile it overcoming steam air heater and expending steam turbine low-pressure steam extraction increase turbine heat rate, exhaust gas temperature rising reduction boiler thermal efficiency
The shortcomings that, moreover, solving the problems, such as that low-level (stack-gas) economizer pipeline system cost is high, operational reliability is demanding.
It is a further object of the present invention to provide a kind of methods for carrying out waste heat recycling using above-mentioned residual neat recovering system.
To achieve the above object, the present invention provides a kind of residual neat recovering system using smoke discharging residual heat as steam air heater heat source,
Including low-level (stack-gas) economizer, steam air heater, condensation water heater and low-pressure heater；The low-level (stack-gas) economizer and steam air heater pass through pipeline
Connection forms first circulation circuit, and the inlet duct of the low-level (stack-gas) economizer is equipped with circulating pump, the inlet tube of the steam air heater
Road is equipped with steam air heater inlet regulating valve；The recirculated water side of the low-level (stack-gas) economizer and condensation water heater connects shape by pipeline
At second circulation circuit, the recirculated water side of the condensation water heater is provided with bypass valve；The condensation water heater
Condensed water side is connected in parallel with the low-pressure heater by pipeline, the condensed water connecting tube between the low-pressure heater
Road is provided with booster pump.
Preferably, the condensation water heater is water water- to-water heat exchanger.
To realize above-mentioned another object, the present invention also provides a kind of exhaust heat recovering method, use is described in any of the above embodiments
Waste heat recycling is carried out using smoke discharging residual heat as the residual neat recovering system of steam air heater heat source, comprising: when the steam air heater to be heated
Cold air flows or temperature when changing, by adjust the steam air heater inlet regulating valve aperture and the circulating pump
Running frequency makes the steam air heater outlet smoke temperature reach design temperature.
Further, when the steam air heater cold air flows to be heated increase or when the temperature drops, increase described warm
The aperture of wind device inlet regulating valve or the running frequency for improving the circulating pump.
Further, when the cold air flows that the steam air heater to be heated reduce or temperature rises, reduce described warm
The aperture of wind device inlet regulating valve or the running frequency for reducing the circulating pump.
To realize above-mentioned another object, the present invention also provides another exhaust heat recovering methods, using described in any of the above-described
Residual neat recovering system using smoke discharging residual heat as steam air heater heat source carry out waste heat recycling, comprising: put into operation when the steam air heater and
When demand heat changes, by adjusting the steam air heater inlet regulating valve and bypass valve aperture, make described low
Warm economizer sufficiently recycles smoke discharging residual heat.
Further, when the steam air heater puts into operation and demand heat is without residue, the water inlet of steam air heater described in increase or standard-sized sheet
The aperture of regulating valve and bypass valve makes the smoke discharging residual heat heat of the low-level (stack-gas) economizer recycling be completely used for the warm wind
Device.
Further, when the steam air heater puts into operation and demand heat has residue, it is decreased or turned off the steam air heater water inlet
The aperture of regulating valve and bypass valve makes the low-level (stack-gas) economizer that the fume afterheat of recycling is passed through the condensation water heater
It is transmitted back to the low-pressure heater.
To realize above-mentioned another object, the present invention also provides another exhaust heat recovering methods, using described in any of the above-described
Residual neat recovering system using smoke discharging residual heat as steam air heater heat source carry out waste heat recycling, comprising: when the heat of the steam air heater
When demand or system spare heat change, by adjusting the running frequency of the booster pump and opening for the bypass valve
Degree changes the heat exchange power of the condensation water heater, so that the outlet smoke temperature of system thermal balance and the low-level (stack-gas) economizer
Reach design temperature.
Further, when the heat demand of the steam air heater becomes larger or system spare heat becomes smaller, described in reducing
The running frequency of booster pump and the aperture for increasing the bypass valve reduce the heat exchange power of the condensation water heater；Work as institute
When the heat demand for stating steam air heater becomes smaller or system spare heat becomes larger, by the running frequency and reduction that improve the booster pump
The aperture of the bypass valve improves the heat exchange power of the condensation water heater.
Residual neat recovering system provided by the present invention and method, by using boiler exhaust gas waste heat as steam air heater of utility boiler
The mode of heat source, takes full advantage of traditional station boiler low-level (stack-gas) economizer and steam air heater two seem incoherent technological merit,
And respective disadvantage is overcome, it realizes and has complementary advantages, wherein the heat source of steam air heater saves original steaming from smoke discharging residual heat
The consuming of vapour alleviates the low-temperature corrosion of air preheater, while because the problem of steam air heater setting brings exhaust gas temperature to increase is by low temperature
Economizer overcomes to recycle, and recycling heat returns to steam air heater again, and the position of low-level (stack-gas) economizer and steam air heater compared with
Be it is close, length of pipeline is short, by condensation water heater realize water water heat exchange, reduce recirculated water side system operating pressure, thus
Overall cost is set to be effectively controlled.It is excellent to be conducive to later maintenance etc. for simple, the short time limit with transformation, system equipment centralized arrangement
Point.
Detailed description of the invention
Fig. 1 is a kind of specific implementation of the residual neat recovering system provided by the present invention using smoke discharging residual heat as steam air heater heat source
The pipeline and composition schematic diagram of mode.
In figure:
1. by 4. circulating pump of low-level (stack-gas) economizer 2. steam air heater, 3. condensation water heater, 5. steam air heater inlet regulating valve 6.
7. low-pressure heater of road regulating valve, 8. booster pump
Specific embodiment
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Referring to FIG. 1, Fig. 1 is the one of the residual neat recovering system provided by the present invention using smoke discharging residual heat as steam air heater heat source
The pipeline and composition schematic diagram of kind specific embodiment.
In a specific embodiment, residual neat recovering system provided by the present invention is warmed up using smoke discharging residual heat as station boiler
Wind device heat source, mainly by low-level (stack-gas) economizer 1, steam air heater 2, condensation water heater 3, circulating pump 4, steam air heater inlet regulating valve 5, side
The composition such as road regulating valve 6, low-pressure heater 7, booster pump 8 can solve air preheater low-temperature corrosion, exhaust gas temperature height, warm wind
The problems such as device steam expends, Conventional cryogenic economizer pipeline is at high cost.
As shown, low-level (stack-gas) economizer 1 connect to form first circulation circuit by pipeline with steam air heater 2, low-level (stack-gas) economizer 1
Inlet duct be equipped with circulating pump 4, circulating pump 4 in addition to can by converting operation adjust quantity of circulating water, also mainly to overcome
The resistance of system water side drives system thermal medium circulation；The inlet duct of steam air heater 2 is equipped with steam air heater inlet regulating valve 5；It is low
Warm economizer 1 connect to form second circulation circuit by pipeline with the recirculated water side of condensation water heater 3, condensation water heater 3
Recirculated water side be provided with bypass valve 6, first circulation circuit forms internal circulation system together with second circulation circuit；Condensation
The condensed water side of water heater 3 is connected in parallel with low-pressure heater 7 by pipeline, with the condensed water between low-pressure heater 7
Connecting pipe is provided with booster pump 8.
When work, low-level (stack-gas) economizer 1 recycles boiler exhaust gas waste heat, and by thermal medium, system is transported to steam air heater 2 by the road,
To heat air preheater entrance cold wind.Specifically, thermal medium is carried out in low-level (stack-gas) economizer 1 and boiler discharging flue gas first in system
Smoke discharging residual heat is recycled in heat exchange, and the thermal medium after heat absorption carries out heat release, heating cold air through pipeline to steam air heater 2.Warm
Thermal medium after 2 heat release of wind device returns to low-level (stack-gas) economizer 1 and continues to absorb heat, and reduces exhaust gas temperature.
Meanwhile not having to the operating condition to put into operation in summer and other steam air heaters 2,3 bypass valve of condensation water heater can be closed
6, the fume afterheat of recycling is added heat exchanger 3 to be transmitted back to the low add-back hot systems of steam turbine by low-level (stack-gas) economizer 1 by condensed water；When primary
When blower or air-supply fan delivery (or temperature) variation, steam air heater inlet regulating valve 5, bypass valve 6 and circulating pump 4 etc. can be passed through
The quantity of circulating water of comprehensive means regulating system meets steam air heater outlet smoke temperature and reaches design requirement；Become in 2 heat demand of steam air heater
When change, i.e. system spare thermal change, in order to guarantee that system entirety heat balance and low-level (stack-gas) economizer outlet smoke temperature are reduced to
Deduster efficient operation temperature can adjust the stream of 3 condensed water side of condensation water heater by adjusting 8 running frequency of booster pump
Amount, and then the heat exchange power of condensation water heater 3 is adjusted, meet the outlet of low-level (stack-gas) economizer 1 smoke temperature and reach design value, maintains system
Heat balance.
The system is cooperated by mutual adjusting of each equipment under each operating condition, and regardless of whether steam air heater 2 puts into operation, low temperature saves coal
The heat that device 1 recycles can still be fully used, and it exports smoke temperature, that is, deduster inlet temperature and stablizes in deduster height
In the range of effect operation, the outlet wind-warm syndrome of steam air heater reaches design value.
Certainly, above-described embodiment is only preferred embodiment of the invention, is specifically not limited thereto, on this basis can basis
Actual needs is made having and targetedly be adjusted, to obtain different embodiments.For example, in order to thermal medium and condensation
Water is controlled, other control valves, etc. are further added on pipeline.Since mode in the cards is more, here just not
Another one illustrates.
In addition to above-mentioned residual neat recovering system, the present invention also provides a kind of exhaust heat recovering method, use above-mentioned with more than smoke evacuation
Heat carries out waste heat recycling as the residual neat recovering system of steam air heater heat source, comprising:
When primary air fan or pressure fan variable parameter operation, when conveying cold air flows increase (or temperature decline), increase
The aperture of steam air heater inlet regulating valve 5 or the running frequency for improving circulating pump 4；Reduce when blower conveys cold air flows (or temperature
Degree rises) when, reduce the aperture of steam air heater inlet regulating valve 5 or reduces the running frequency of circulating pump 4.It is intake and is adjusted by steam air heater
The adjusting of 5 aperture of valve and 4 running frequency of circulating pump is saved to meet the requirement that steam air heater 4 exports smoke temperature.
Steam air heater puts into operation and when demand heat is without residue in winter, and the smoke discharging residual heat heat that low-level (stack-gas) economizer 1 recycles is whole
For steam air heater 2, bypass valve 6 is opened, thermal medium returns to low-level (stack-gas) economizer 1 after 2 heat release of steam air heater and continues to absorb heat；And it is right
There is remaining operating condition in summer and other 2 heat demands of steam air heater, is decreased or turned off steam air heater inlet regulating valve 5 and bypass is adjusted
The fume afterheat of recycling is transmitted back to steam turbine low-pressure heater 7 by condensation water heater 3 by the aperture of valve 6, low-level (stack-gas) economizer 1,
Guarantee abundant recycling of the low-level (stack-gas) economizer 1 for smoke discharging residual heat.
In 2 heat demand of steam air heater variation, system spare thermal change, the running frequency for adjusting booster pump 8 can be passed through
With the heat exchange power of the aperture regulation condensation water heater 3 of bypass valve 6, guarantee system thermal balance and low-level (stack-gas) economizer
Outlet smoke temperature reaches design requirement.
Specifically, when the heat demand of steam air heater 2 becomes larger or system spare heat becomes smaller, by reducing booster pump 8
Running frequency and the aperture for increasing bypass valve 6 reduce the heat exchange power of condensation water heater 3；When the heat of steam air heater 2 needs
It asks and becomes smaller or when system spare heat becomes larger, pass through the running frequency for improving booster pump 8 and reduce opening for the bypass valve 6
Degree improves the heat exchange power of condensation water heater 3.
Residual neat recovering system and method provided by the present invention using smoke discharging residual heat as steam air heater of utility boiler heat source, phase
Than, to the low-level (stack-gas) economizer of steam turbine side, having following excellent in traditional steam air heater using steam turbine steam extraction as heat source and heat recovery
Point:
Firstly, original steam air heater mitigation air preheater low-temperature corrosion is remained, the recycling boiler exhaust gas waste heat of low-level (stack-gas) economizer,
The advantages of reducing steam turbine power generation coal consumption.
Increase turbine heat rate, exhaust gas temperature reduction boiler secondly, overcoming original steam air heater and expending steam turbine low-pressure steam extraction
The shortcomings that thermal efficiency, and solve the problems, such as that original low-level (stack-gas) economizer pipeline system cost is high, operational reliability is demanding.
Furthermore also have transformation simple, short time limit, system equipment centralized arrangement is conducive to later maintenance.
The residual neat recovering system and method to provided by the present invention using smoke discharging residual heat as steam air heater heat source carry out above
It is discussed in detail.Used herein a specific example illustrates the principle and implementation of the invention, above embodiments
Explanation be merely used to help understand the core idea of the present invention.It should be pointed out that for those skilled in the art
For, it without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention, these improve and repair
Decorations are also fallen within the protection scope of the claims of the present invention.
Claims (10)
1. a kind of using smoke discharging residual heat as the residual neat recovering system of steam air heater heat source, which is characterized in that including low-level (stack-gas) economizer
(1), steam air heater (2), condensation water heater (3) and low-pressure heater (7)；The low-level (stack-gas) economizer (1) passes through with steam air heater (2)
Pipeline connects to form first circulation circuit, and the inlet duct of the low-level (stack-gas) economizer (1) is equipped with circulating pump (4), the warm wind
The inlet duct of device (2) is equipped with steam air heater inlet regulating valve (5)；The low-level (stack-gas) economizer (1) and condensation water heater (3)
Recirculated water side connects to form second circulation circuit by pipeline, and the recirculated water side of the condensation water heater (3) is provided with bypass
Regulating valve (6)；The condensed water side of the condensation water heater (3) is connected in parallel with the low-pressure heater (7) by pipeline,
Condensed water connecting pipe between the low-pressure heater (7) is provided with booster pump (8).
2. according to claim 1 using smoke discharging residual heat as the residual neat recovering system of steam air heater heat source, which is characterized in that institute
Stating condensation water heater (3) is water water- to-water heat exchanger.
3. a kind of exhaust heat recovering method, use described in the claims 1 or 2 using smoke discharging residual heat as steam air heater heat source more than
Heat recovery system carries out waste heat recycling, comprising: the cold air flows or temperature to be heated when the steam air heater (2) change
When, by adjusting the aperture of the steam air heater inlet regulating valve (5) and the running frequency of the circulating pump (4), make the warm wind
Device (2) outlet smoke temperature reaches design temperature.
4. exhaust heat recovering method according to claim 3, which is characterized in that when the steam air heater (2) to be heated it is cold
Air mass flow increases or when the temperature drops, increases the aperture of the steam air heater inlet regulating valve (5) or improve the circulating pump (4)
Running frequency.
5. exhaust heat recovering method according to claim 3, which is characterized in that when the steam air heater (2) to be heated it is cold
When air mass flow reduces or temperature rises, reduces the aperture of the steam air heater inlet regulating valve (5) or reduce the circulating pump (4)
Running frequency.
6. a kind of exhaust heat recovering method, use described in the claims 1 or 2 using smoke discharging residual heat as steam air heater heat source more than
Heat recovery system carries out waste heat recycling, comprising: when the steam air heater (2) puts into operation and demand heat changes, passes through adjusting
The steam air heater inlet regulating valve (5) and bypass valve (6) apertures make the low-level (stack-gas) economizer (1) sufficiently recycling benefit
Use smoke discharging residual heat.
7. exhaust heat recovering method according to claim 6, which is characterized in that when the steam air heater (2) put into operation and demand heat
When amount is without residue, the aperture of steam air heater inlet regulating valve (5) and bypass valve (6) described in increase or standard-sized sheet makes the low temperature
The smoke discharging residual heat heat of economizer (1) recycling is completely used for the steam air heater (2).
8. exhaust heat recovering method according to claim 6, which is characterized in that when the steam air heater (2) put into operation and demand heat
When amount has residue, it is decreased or turned off the aperture of the steam air heater inlet regulating valve (5) and bypass valve (6), makes the low temperature
The fume afterheat of recycling is transmitted back to the low-pressure heater (7) by the condensation water heater (3) by economizer (1).
9. a kind of exhaust heat recovering method, use described in the claims 1 or 2 using smoke discharging residual heat as steam air heater heat source more than
Heat recovery system carries out waste heat recycling, comprising: when the heat demand or system spare heat of the steam air heater (2) change
When, the aperture change condensed water heating of running frequency and the bypass valve (6) by adjusting the booster pump (8)
The heat exchange power of device (3), so that system thermal balance and the outlet smoke temperature of the low-level (stack-gas) economizer (1) reach design temperature.
10. exhaust heat recovering method according to claim 9, which is characterized in that when the heat demand of the steam air heater (2) becomes
When big or system spare heat becomes smaller, by reducing the running frequency of the booster pump (8) and increasing the bypass valve (6)
Aperture reduce the heat exchange power of the condensation water heater (3)；When the heat demand of the steam air heater (2) becomes smaller or system is surplus
When excess heat becomes larger, improved by the running frequency for improving the booster pump (8) and the aperture for reducing the bypass valve (6)
The heat exchange power of the condensation water heater (3).
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| CN114993091B (en) * | 2022-05-18 | 2023-05-12 | 北京航化节能环保技术有限公司 | Zero-power consumption self-adaptive distributed waste heat recycling system of ethylene device |
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