CN106969373B - The air preheating system and air preheat method of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN - Google Patents
The air preheating system and air preheat method of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN Download PDFInfo
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- CN106969373B CN106969373B CN201610023648.XA CN201610023648A CN106969373B CN 106969373 B CN106969373 B CN 106969373B CN 201610023648 A CN201610023648 A CN 201610023648A CN 106969373 B CN106969373 B CN 106969373B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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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 discloses a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN and air preheat method, the system comprises: air preheater (33), air preheater primary air separating duct (31), air preheater rear pass (32), condensed water main pipe (11), main steam range (15), air heater (28), Gas phase Smoke cooler (12), flue gas water cooler (7), phase transformation water heater (17), condensation water regulating valve (30), steam flow regulating valve (14), fluid flow tube (5).Final stage flue gas waste heat recovery heat exchanger is used sub-control phase-change heat-exchange mode by the present invention, with condensed water air heater and high-temperature flue gas cooler combination, improves the benefit of waste heat recycling.
Description
Technical field
The invention belongs to safely controllable technical field of heat transfer, the heat recovery particularly suitable for boiler smoke
With the fields such as air preheat.
Background technique
Phase-change heat-exchange has big coefficient of heat transfer height, medium carrying latent heat and phase transformation saturation temperature and saturation pressure unique
It is corresponding, the features such as phase change fluid uniformity of temperature profile, phase transition parameter is easy to control, thus it is widely used in augmentation of heat transfer and remaining
Recuperation of heat utilizes system.
Sub-control phase change technique is because cold and heat source phase transition parameter is independently controlled, so that heat source phase transition parameter is not cooled
Source exchanges heat the influence of phase transition parameter, and the reliable guarantee stabilization of heat source phase transition parameter is applied in generations such as burning high sulfur coals
It is unique excellent in low-temperature corrosion and the flue gas waste heat recovery system for blocking up ash preventing heat source heat exchanger from occurring when highly corrosive gas
Gesture.Simultaneously its can intelligent optimal control heat-setting water and air pre-heater inlet air mode so that waste heat recycling effect
Benefit improves.
But also some are insufficient relatively for existing sub-control Phase Transition Systems, since it condenses fume afterheat whole indirect heating
Water increases heat transfer temperature difference, increases diabatic processLoss；Due to the influence of condensation water heater terminal temperature difference, coagulate
Bear water carry out coolant-temperature gage cannot be too high, thus bypass condensed water exclusion low-temperature level be low plus steam extraction reduces the efficiency of UTILIZATION OF VESIDUAL HEAT IN；Separately
Outside, existing sub-control phase change technique reduces the water inlet degree of supercooling of flue Phase cooling device using vapour-liquid heat exchanger, needs external
Auxiliary vapour supplementary heating water, system is complex, and otherwise acceptor heats steam and the terminal temperature difference of water and influences, and water temperature is difficult to close to master
Heat the saturation temperature of steam.
Summary of the invention
For the deficiency of existing sub-control phase-change heat-exchange technology, it is an object of the present invention to which it is comprehensive to propose a kind of sub-control phase transformation
The air preheating system of UTILIZATION OF VESIDUAL HEAT IN is closed, final stage flue gas waste heat recovery heat exchanger uses sub-control phase-change heat-exchange mode, with condensed water
Air heater and high-temperature flue gas cooler combination improve the benefit and equipment performance of waste heat recycling.
In order to achieve the above objectives, present invention employs the following technical solutions:
A kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN, comprising:
Air preheater 33, air preheater rear pass 32, condensed water main pipe 11, steams air preheater primary air separating duct 31
Vapour general pipeline 15, air heater 28, Gas phase Smoke cooler 12, flue gas water cooler 7, phase transformation water heater 17, condensed water tune
Save valve 30, steam flow regulating valve 14, fluid flow tube 5；
Air heater 28, condensation water regulating valve are disposed with along condensed water flow direction on the condensed water main pipe 11
30, phase transformation water heater 17, flue gas water cooler 7；
The water side of the air heater 28, phase transformation water heater 17 and flue gas water cooler 7 with condensed water main pipe
11 connection；
The condensed water main pipe 11 carry out water end (W.E.) and backwater end is both connected to the lowest temperature that steam turbine is flowed to along condensed water
Grade low-pressure heater after condensed water supervisor on, the backwater end and condensed water supervisor tie point along condensed water be responsible for water flow to
After the tie point for coming water end (W.E.) and condensed water supervisor；
The air preheater primary air separating duct 31 and air preheater rear pass 32 respectively with the air duct of air preheater 33 into
Mouth side and flue outlet side connection；
28 air side of air heater and 31 connection of air preheater primary air separating duct；
The fume side and 32 connection of air preheater rear pass of the flue gas water cooler 7；
The Gas phase Smoke cooler 12 along flue gas flow direction flue gas water cooler 7 is set after air preheater rear pass
On 32, the fume side and 32 connection of air preheater rear pass of the Gas phase Smoke cooler 12；
The steam side of the Gas phase Smoke cooler 12 and phase transformation water heater 17 passes through 15 connection of main steam range；The steaming
Steam flow regulating valve 14 is provided on vapour general pipeline 15；
One end of the fluid flow tube 5 is connected to the liquid feeding side of Gas phase Smoke cooler 12, and the other end of the fluid flow tube 5 connects
It connects in 17 vapour side lower part of phase transformation water heater；Or the other end of the fluid flow tube 5 be connected to it is other to Gas phase Smoke cooler
12 provide the equipment of condensate liquid；Liquid stream regulating valve is provided on the fluid flow tube 5；
The bottom of the phase transformation water heater 17 is higher than the bottom of Gas phase Smoke cooler 12, it is ensured that phase transformation water heater 17
Condensate liquid in vapour side can flow back into Gas phase Smoke cooler 12 through fluid flow tube 5 by natural circulation mode；
The phase transition parameter sensor 13 is arranged on Gas phase Smoke cooler 12, for measuring Gas phase Smoke cooler 12
Interior pressure phase transition or phase transition temperature；
The air heater bypass valve 19 and air being arranged the system also includes: air heater shunt valve and thereon
Heater by-pass throttle valve；The air heater by-pass throttle valve can be used for adjusting the flowing resistance of air heater shunt valve
Power, to improve the control characteristic of air heater bypass valve 19.
Air heater shunt valve one end is connected on the condensed water main pipe 11 before air heater 28, the other end
It is connected to phase transformation water heater 17 and condenses on the condensed water main pipe 11 between water regulating valve 30.
It is improved as of the invention one, the system also includes: water temperature sensor 18, flue gas water before phase transformation water heater
Cooler inlet water temperature sensor 9, flue gas water cooler exit water temperature sensor 8, main air temperature sensor 4 and flue go out
Mouth smoke temperature sensor 22；
Water temperature sensor 18 is arranged in the air heater shunt valve and condensed water trunk before the phase transformation water heater
Condensed water of the pipe 11 between the tie point and phase transformation water heater 17 between phase transformation water heater 17 and condensation water regulating valve 30
On main pipe 11；
The flue gas water cooler inlet water temperature sensor 9 setting phase transformation water heater 17 and flue gas water cooler 7 it
Between condensed water main pipe 11 on；
The condensed water main pipe after flue gas water cooler 7 is arranged in the flue gas water cooler exit water temperature sensor 8
On 11；
The main air temperature sensor 4 flows to wind before the air preheater after air heater 28 is arranged in along air
On road 31；
The flue outlet smoke temperature sensor 22 along flue gas flow direction Gas phase Smoke cooler 12 is set after air preheat
On device rear pass 32.
As another of the invention improvement, it is arranged the system also includes: low temperature water-circulating pipe 26 and thereon low
Warm water circulation pump 23 and water at low temperature circulating regulation valve 29；
Described 26 one end of low temperature water-circulating pipe is connected to air heater 28 and condenses the condensed water between water regulating valve 30
On main pipe 11；The other end be connected to steam turbine low-pressure heater condensed water supervisor on lowest temperature grade low-pressure heater before or
Before gland heater；
As another improvement of the invention, the system also includes:
The flue gas water cooler 7 is made of low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a；It is described low
Warm flue gas water cooler 7b and high-temperature flue gas water cooler 7a is sequentially arranged on condensed water main pipe 11 along condensed water flow direction；
In the flue gas water cooler inlet water temperature sensor 9 and phase transformation water heater 17 on the condensed water main pipe 11
Between be provided with booster water pump 10；
The system also includes: hot water re-circulation pipe 2；
One end of the hot water re-circulation pipe 2 be connected to low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a it
Between condensed water main pipe 11 on；The other end of the hot water re-circulation pipe 2 is connected to phase transformation water heater 17 and phase transformation water adds
Condensed water main pipe 11 before hot device between water temperature sensor 18；Or the other end of the hot water re-circulation pipe 2 is connected to phase
Become the condensed water main pipe 11 between water heater 17 and booster water pump 10；
The hot water re-circulation pipe 2 is equipped with hot water re-circulation tune valve 1；
The hot water re-circulation pipe 2 is equipped with hot water re-circulation booster pump；
Height is disposed with after main air temperature sensor 4 along air flow direction on the air preheater primary air separating duct 31
Warm air heater 3 and secondary air temperature sensor 4a；
The air side of the high-temperature air heater 3 is connected with air preheater primary air separating duct 31；The high temperature air adds
The condensed water side of hot device 3 is connected with hot water re-circulation pipe 2.
As further improvement of the invention, the system also includes: water warmup heater 6；
The high temperature side connection of the water pre-heater 6 is in low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a
Between condensed water main pipe 11 on；
The low temperature side of the water pre-heater 6 is phase transformation evaporation and heat-exchange side, the liquid space of phase transformation evaporation and heat-exchange side
Pass through water pre-heater steam pipe and Gas phase Smoke cooler with the air space of 5 connection of fluid flow tube, phase transformation evaporation and heat-exchange side
12 vapour side connection；Or with main steam range 15 before steam flow regulating valve 14 connection.
On the basis of any of the above-described technical solution, another improvement of the invention is:
Low temperature water cooler 27 and low temperature water heater 25 are successively arranged along condensed water flow direction on low temperature water-circulating pipe 26；Institute
State the air side and 31 connection of air preheater primary air separating duct of low temperature water cooler 27；The low temperature water cooler 27 is flowed to along air
Before air heater 28；
The low temperature water cooler 27 is before the blower that air flow direction is located on air preheater primary air separating duct 31, so that low temperature
Water cooler 27 has bigger heat transfer temperature difference, and condensed water temperature drop can be made low more；
When condensed water flows through low temperature water cooler 27 in low temperature water-circulating pipe 26, wind before air preheater is transferred heat to
The air of low temperature water cooler 27 is flowed through in road 31, air themperature increases, and condensing water temperature reduces；
When condensed water flows through low temperature water heater 25 in low temperature water-circulating pipe 26, vapour is come from low temperature water heater 25 is entered
The steam discharge heat exchange of the steam discharge or steam-driven induced draft fan steam turbine of turbine, turbine discharge are condensed, and condensed water is heated.
System of the present invention can also include following improvement；
One, in the system is improved, main steam range 15 is connected with phase transformation air heater steam supply after steam flow regulating valve 14
Pipe 20；The other end of the phase transformation air heater steam supply pipe 20 is connected on phase transformation air heater 24；The phase changing air
Heater steam supply pipe 20 is equipped with phase transformation air heater steam supply valve 21；The phase transformation air heater 24 is arranged in high temperature air
On air preheater primary air separating duct 31 between heater 3 and air heater 28；
Two, in the system are improved, the condensed water main pipe 11 is connected with the heating of phase transformation water before air heater 28
Device shunt valve；The other end of the phase transformation water heater shunt valve is connected between phase transformation water heater 17 and booster water pump 10；
Phase transformation water heater bypass valve 16 is provided on the phase transformation water heater shunt valve.
Based on the above-mentioned technical proposal, the present invention also provides a kind of air preheat sides of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN
Method the described method comprises the following steps:
Condensed water in the steam turbine low-pressure heater condensed water supervisor is by condensed water main pipe 11 followed by sky
It is returned in condensed water supervisor after hot-air heater 28, condensation water regulating valve 30, phase transformation water heater 17 and flue gas water cooler 7；
When air flows through air heater 28 in the air preheater primary air separating duct 31, the condensed water heating flowed through, so
Enter air preheater 33 afterwards；
Air flows through air preheater with flue gas in air preheater rear pass 32 in the air preheater primary air separating duct 31
It exchanges heat when 33, smoke temperature reduces, and air themperature further increases；
Partial heat is transmitted to condensed water when flue gas flows through flue gas water cooler 7 in the air preheater rear pass 32,
Temperature rise of condensate is high, and smoke temperature further decreases；
When flue gas flows through Gas phase Smoke cooler 12 in the air preheater rear pass 32, partial heat is transmitted to flue gas
Saturation condensate liquid in Phase cooling device 12 makes saturation condensate liquid undergo phase transition generation steam, and smoke temperature further decreases；
The steam that phase transformation generates in the Gas phase Smoke cooler 12 enters phase through main steam range 15 and steam flow regulating valve 14
Become water heater 17, heating flows through the condensed water of phase transformation water heater 17, and steam is condensed into condensate liquid, and condensed water is heated liter
Temperature；
When liquid level is low in the Gas phase Smoke cooler 12, the regulating valve on fluid flow tube 5 is opened greatly, condensate liquid from fluid flow tube into
Enter in Gas phase Smoke cooler 12, to maintain liquid level；
Partial coagulation water in the condensed water main pipe 11 is through low temperature water-circulating pipe 26,29 and of water at low temperature circulating regulation valve
Low temperature water-circulating pump 23 returns to steam turbine low-pressure heater condensed water supervisor；
The steam flow regulating valve 14 is controlled according to the measured value of phase transition parameter sensor 13, when phase transition parameter sensor 13
Measured value is greater than phase transition parameter setting value, then 14 aperture of steam flow regulating valve increases, otherwise turns down；
Condensation water regulating valve 30 is controlled by temperature measured by flue outlet smoke temperature sensor 22, when flue outlet smoke temperature passes
Temperature measured by sensor 22 is greater than flue outlet smoke temperature setting value, then condenses the increase of 30 aperture of water regulating valve, otherwise turn down；Institute
The control for stating 18 measured value of water temperature sensor before by phase transformation water heater of air heater bypass valve 19, before phase transformation water heater
Water temperature measured by water temperature sensor 18 be higher than phase transformation water heater before water temperature setting value when, 19 aperture of air heater bypass valve
It turns down, otherwise opens big；Water temperature setting value is according to the survey of flue gas water cooler inlet water temperature sensor 9 before the phase transformation water heater
Magnitude control, when the measured value of flue gas water cooler inlet water temperature sensor 9 is higher than flue gas water cooler inlet water temperature setting value
When, water temperature setting value reduces before phase transformation water heater, otherwise increases；Measured by flue gas water cooler inlet water temperature sensor 9
Temperature be less than flue gas water cooler inlet water temperature alarming value, issue alarm signal；The flue gas water cooler inlet water temperature report
Alert value is 10-70 DEG C higher than flue gas water dew point；
Alternatively, condensation water regulating valve 30 before by phase transformation water heater temperature measured by water temperature sensor 18 controlled, work as phase
Temperature measured by water temperature sensor 18 is greater than water temperature setting value before phase transformation water heater before change water heater, then condensed water is adjusted
30 aperture of valve increases, otherwise turns down；Water temperature setting value is passed according to flue gas water cooler inlet water temperature before the phase transformation water heater
The measured value of sensor 9 controls, and enters saliva when the measured value of flue gas water cooler inlet water temperature sensor 9 is higher than flue gas water cooler
When warm setting value, water temperature setting value reduces before phase transformation water heater, otherwise increases；When flue gas water cooler inlet water temperature sensor
Temperature measured by 9 is less than flue gas water cooler inlet water temperature alarming value, issues alarm signal；The flue gas water cooler entrance
Water temperature alarming value is 10-70 DEG C higher than flue gas water dew point；
The air heater bypass valve 19 by 22 measured value of flue outlet smoke temperature sensor control, when flue outlet cigarette
When smoke temperature measured by temperature sensor 22 is higher than flue outlet smoke temperature setting value, 19 aperture of air heater bypass valve is opened greatly, instead
Turn down；
Alternatively, control of the air heater bypass valve 19 by 8 measured value of flue gas water cooler exit water temperature sensor,
It is empty when the water temperature measured by the flue gas water cooler exit water temperature sensor 8 is higher than flue gas water cooler exit water temperature setting value
19 aperture of hot-air heater bypass valve is opened greatly, otherwise is turned down；
The water temperature measured by the flue gas water cooler exit water temperature sensor 8 is set lower than flue gas water cooler exit water temperature
When value, alarm signal is issued；The flue gas water cooler exit water temperature setting value is higher than 11 backwater end of condensed water main pipe and coagulates
Bear water the condensation water temperature in the condensed water supervisor at the tie point of supervisor；
The water at low temperature circulating regulation valve 29 by 4 measured value of main air temperature sensor control, when main air temperature
When spending 4 measured value of sensor higher than main air desired temperature, water at low temperature circulating regulation valve 29 is turned down, otherwise is opened big.
The coolant-temperature gage that comes in condensed water main pipe 11 can be according to 22 measured value of flue outlet smoke temperature sensor or main air
4 measured value of temperature sensor is controlled；When 22 measured value of flue outlet smoke temperature sensor or main air temperature sensor 4 are surveyed
When magnitude is higher than respective corresponding setting value, the low temperature before can increasing low-temperature heater carrys out water, the height after reducing low-temperature heater
Temperature carrys out water；Vice versa.
Further, the method also includes following steps:
The temperature in condensed water main pipe 11 between low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a compared with
High condensed water returns to condensed water main pipe 11, or the effect in hot water re-circulation booster pump under the action of booster water pump 10
Under, condensed water main pipe 11 is returned to through high-temperature air heater 3 and hot water re-circulation tune valve 1；In the high-temperature air heater 3
Interior, the higher condensed water of temperature and air conduct heat, and condensed water temperature drop is low, and air themperature increases；
The hot water re-circulation tune valve 1 controls aperture according to secondary air temperature sensor 4a measured value, works as secondary air
When temperature sensor 4a measured value is greater than secondary air desired temperature, hot water re-circulation tune valve 1 is turned down, otherwise is opened big；
The secondary air desired temperature is more than or equal to main air desired temperature.
Further, the system also includes following steps:
5 inner condensat liquid of fluid flow tube enters the phase transformation evaporation and heat-exchange side of water pre-heater 6, by 6 high temperature of water pre-heater
The condensed water of side heats, and the condensate liquid of supercooling is heated to saturation temperature, and the steam of generation passes through water pre-heater steam pipe
Vapour side or main steam range 15 into Gas phase Smoke cooler 12；The condensate liquid of saturation enters the vapour in Gas phase Smoke cooler 12
Side or liquid side space.
Unaccounted content can use ordinary skill in the art means in the present invention.
It, can be using manual operation in the present invention when not using sensor.
Compared with prior art, advantages of the present invention:
1, optimal control fume afterheat is respectively used to heating air and flue gas heat recovery can be improved in condensed water
Benefit.Condensed water air heater is used since the present invention combines, the steam that Gas phase Smoke cooler generates can only heat solidifying
It bears water, thus natural circulation mode can also be used in sub-control Phase Transition Systems of the invention, to simplify system.
2, it is combined by high-temperature flue gas cooler and low temperature sub-control phase transformation gas cooler, that is, coagulation hydroenergy backwater temperature can be improved
Degree can also reliably prevent gas cooler low-temperature corrosion and the serious generation for blocking up ash；
3, air is first heated using the low condensed water added of bypass, then is condensed the mode of water heater heating, can be improved solidifying
It bears water and carrys out coolant-temperature gage, the pumping of exclusion more high parameter goes to generate electricity, and the thermal efficiency improves；
4, air preheater can further improve using the condensed water in high temperature heating air extracted out in high-temperature flue gas cooler
Entering air temperature improves air preheater anti-low-temperature corrosion and blocks up the ability of ash；Simultaneously can optimal control condensed water for return water
Parameter and flow, and the smoke temperature into high-temperature flue gas cooler is improved, promote the quality of UTILIZATION OF VESIDUAL HEAT IN；
5, cooling using the condensed water in high temperature heating phase transformation flue gas extracted out in high-temperature flue gas cooler by water pre-heater
The water inlet of device, the coefficient of heat transfer is high, and high-temperature medium temperature is slightly above cryogenic media, can effectively eliminate the water inlet of phase transformation gas cooler
Degree of supercooling, avoid the occurrence of phase transformation gas cooler wall temperature controlling dead error, improve device security；
6, combined control system scheme of the invention, can intelligent optimization system operation, make system always with optimal
Cascaded utilization of energy mode is run, and can also realize the independent control of measurement parameter, it is ensured that air preheater and gas cooler are set
Standby safety and performance.
Detailed description of the invention
Fig. 1 is a structural schematic diagram of present system；
Fig. 2 is another structural schematic diagram of present system；
Appended drawing reference: 1, hot water re-circulation tune valve；2, hot water re-circulation pipe；3, high-temperature air heater；4, main air
Temperature sensor；4a, secondary air temperature sensor；5, fluid flow tube；6, water pre-heater；7, flue gas water cooler；7a, high temperature
Flue gas water cooler；7b, low-temperature flue gas water cooler；8, flue gas water cooler exit water temperature sensor；9, flue gas water cooler
Inlet water temperature sensor；10, booster water pump；11, condensed water main pipe；12, Gas phase Smoke cooler；13, phase transition parameter senses
Device；14, steam flow regulating valve；15, main steam range；16, phase transformation water heater bypass valve；17, phase transformation water heater；18, phase transformation water
Water temperature sensor before heater；19, air heater bypass valve；20, phase transformation air heater steam supply pipe；21, phase changing air adds
Hot device steam supply valve；22, flue outlet smoke temperature sensor；23, low temperature water-circulating pump；24, phase transformation air heater；25, water at low temperature
Heater；26, low temperature water-circulating pipe；27, low temperature water cooler；28, air heater；29, water at low temperature circulating regulation valve；30,
Condense water regulating valve；31, air preheater primary air separating duct；32, air preheater rear pass；33, air preheater.
Specific embodiment
With the drawings and specific embodiments, the present invention is described in further detail below.
Embodiment 1
As shown in the part Fig. 1, a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN, comprising:
Air preheater 33, air preheater rear pass 32, condensed water main pipe 11, steams air preheater primary air separating duct 31
Vapour general pipeline 15, air heater 28, Gas phase Smoke cooler 12, flue gas water cooler 7, phase transformation water heater 17, condensed water tune
Save valve 30, steam flow regulating valve 14, fluid flow tube 5；
Air heater 28, condensation water regulating valve are disposed with along condensed water flow direction on the condensed water main pipe 11
30, phase transformation water heater 17, flue gas water cooler 7；
The water side of the air heater 28, phase transformation water heater 17 and flue gas water cooler 7 with condensed water main pipe
11 connection；
The condensed water main pipe 11 carry out water end (W.E.) and backwater end is both connected to the lowest temperature that steam turbine is flowed to along condensed water
Grade low-pressure heater after condensed water supervisor on, the backwater end and condensed water supervisor tie point along condensed water be responsible for water flow to
After the tie point for coming water end (W.E.) and condensed water supervisor；
The air preheater primary air separating duct 31 and air preheater rear pass 32 respectively with the air duct of air preheater 33 into
Mouth side and flue outlet side connection；
28 air side of air heater and 31 connection of air preheater primary air separating duct；
The fume side and 32 connection of air preheater rear pass of the flue gas water cooler 7；
The Gas phase Smoke cooler 12 along flue gas flow direction flue gas water cooler 7 is set after air preheater rear pass
On 32, the fume side and 32 connection of air preheater rear pass of the Gas phase Smoke cooler 12；
The steam side of the Gas phase Smoke cooler 12 and phase transformation water heater 17 passes through 15 connection of main steam range；The steaming
Steam flow regulating valve 14 is provided on vapour general pipeline 15；
One end of the fluid flow tube 5 is connected to the liquid feeding side of Gas phase Smoke cooler 12, and the other end of the fluid flow tube 5 connects
It connects in 17 vapour side lower part of phase transformation water heater；Or the other end of the fluid flow tube 5 be connected to it is other to Gas phase Smoke cooler
12 provide the equipment of condensate liquid；Liquid stream regulating valve is provided on the fluid flow tube 5；
The bottom of the phase transformation water heater 17 is higher than the bottom of Gas phase Smoke cooler 12, it is ensured that phase transformation water heater 17
Condensate liquid in vapour side can flow back into Gas phase Smoke cooler 12 through fluid flow tube 5 by natural circulation mode；
The phase transition parameter sensor 13 is arranged on Gas phase Smoke cooler 12, for measuring Gas phase Smoke cooler 12
Interior pressure phase transition or phase transition temperature；
The air heater bypass valve 19 and air being arranged the system also includes: air heater shunt valve and thereon
Heater by-pass throttle valve；
Air heater shunt valve one end is connected on the condensed water main pipe 11 before air heater 28, the other end
It is connected to phase transformation water heater 17 and condenses on the condensed water main pipe 11 between water regulating valve 30.
Embodiment 2
As shown in Figure 1, a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN, comprising:
Air preheater 33, air preheater rear pass 32, condensed water main pipe 11, steams air preheater primary air separating duct 31
Vapour general pipeline 15, air heater 28, Gas phase Smoke cooler 12, flue gas water cooler 7, phase transformation water heater 17, condensed water tune
Save valve 30, steam flow regulating valve 14, fluid flow tube 5；
Air heater 28, condensation water regulating valve are disposed with along condensed water flow direction on the condensed water main pipe 11
30, water temperature sensor 18, phase transformation water heater 17, flue gas water cooler inlet water temperature sensor 9, flue gas before phase transformation water heater
Water cooler 7 and flue gas water cooler exit water temperature sensor 8；
The water side of the air heater 28, phase transformation water heater 17 and flue gas water cooler 7 with condensed water main pipe
11 connection；
The condensed water main pipe 11 carry out water end (W.E.) and backwater end is both connected to the lowest temperature that steam turbine is flowed to along condensed water
Grade low-pressure heater after condensed water supervisor on, the backwater end and condensed water supervisor tie point along condensed water be responsible for water flow to
After the tie point for coming water end (W.E.) and condensed water supervisor；
The air preheater primary air separating duct 31 and air preheater rear pass 32 respectively with the air duct of air preheater 33 into
Mouth side and flue outlet side connection；
28 air side of air heater and 31 connection of air preheater primary air separating duct；
The fume side and 32 connection of air preheater rear pass of the flue gas water cooler 7；
The Gas phase Smoke cooler 12 along flue gas flow direction flue gas water cooler 7 is set after air preheater rear pass
On 32, the fume side and 32 connection of air preheater rear pass of the Gas phase Smoke cooler 12；
The steam side of the Gas phase Smoke cooler 12 and phase transformation water heater 17 passes through 15 connection of main steam range；The steaming
Steam flow regulating valve 14 is provided on vapour general pipeline 15；
One end of the fluid flow tube 5 is connected to the liquid feeding side of Gas phase Smoke cooler 12, and the other end of the fluid flow tube 5 connects
It connects in 17 vapour side lower part of phase transformation water heater；Or the other end of the fluid flow tube 5 be connected to it is other to Gas phase Smoke cooler
12 provide the equipment of condensate liquid；Liquid stream regulating valve is provided on the fluid flow tube 5；
The bottom of the phase transformation water heater 17 is higher than the bottom of Gas phase Smoke cooler 12, it is ensured that phase transformation water heater 17
Condensate liquid in vapour side can flow back into Gas phase Smoke cooler 12 through fluid flow tube 5 by natural circulation mode；
The phase transition parameter sensor 13 is arranged on Gas phase Smoke cooler 12, for measuring Gas phase Smoke cooler 12
Interior pressure phase transition or phase transition temperature；
Water temperature sensor 18 is arranged in the air heater shunt valve and condensed water trunk before the phase transformation water heater
Condensed water of the pipe 11 between the tie point and phase transformation water heater 17 between phase transformation water heater 17 and condensation water regulating valve 30
On main pipe 11；
The air heater bypass valve 19 being arranged the system also includes: air heater shunt valve and thereon；
Air heater shunt valve one end is connected on the condensed water main pipe 11 before air heater 28, the other end
It is connected to phase transformation water heater 17 and condenses on the condensed water main pipe 11 between water regulating valve 30；
The low temperature water-circulating pump 23 and water at low temperature circulation being arranged the system also includes: low temperature water-circulating pipe 26 and thereon
Regulating valve 29；
Described 26 one end of low temperature water-circulating pipe is connected to air heater 28 and condenses the condensed water between water regulating valve 30
On main pipe 11；The other end be connected to steam turbine low-pressure heater condensed water supervisor on lowest temperature grade low-pressure heater before or
Before gland heater；
The system also includes: main air temperature sensor 4 and flue outlet smoke temperature sensor 22,
The main air temperature sensor 4 flows to wind before the air preheater after air heater 28 is arranged in along air
On road 31；
The flue outlet smoke temperature sensor 22 along flue gas flow direction Gas phase Smoke cooler 12 is set after air preheat
On device rear pass 32.
The present invention also provides a kind of residual-heat utilization method of the air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN, institutes
State method the following steps are included:
Condensed water in the steam turbine low-pressure heater condensed water supervisor is by condensed water main pipe 11 followed by sky
It is returned in condensed water supervisor after hot-air heater 28, condensation water regulating valve 30, phase transformation water heater 17 and flue gas water cooler 7；
When air flows through air heater 28 in the air preheater primary air separating duct 31, the condensed water heating flowed through, so
Enter air preheater 33 afterwards；
Air flows through air preheater with flue gas in air preheater rear pass 32 in the air preheater primary air separating duct 31
It exchanges heat when 33, smoke temperature reduces, and air themperature further increases；
Partial heat is transmitted to condensed water when flue gas flows through flue gas water cooler 7 in the air preheater rear pass 32,
Temperature rise of condensate is high, and smoke temperature further decreases；
When flue gas flows through Gas phase Smoke cooler 12 in the air preheater rear pass 32, partial heat is transmitted to flue gas
Saturation condensate liquid in Phase cooling device 12 makes saturation condensate liquid undergo phase transition generation steam, and smoke temperature further decreases；
The steam that phase transformation generates in the Gas phase Smoke cooler 12 enters phase through main steam range 15 and steam flow regulating valve 14
Become water heater 17, heating flows through the condensed water of phase transformation water heater 17, and steam is condensed into condensate liquid, and condensed water is heated liter
Temperature；
When liquid level is low in the Gas phase Smoke cooler 12, the regulating valve on fluid flow tube 5 is opened greatly, condensate liquid from fluid flow tube into
Enter in Gas phase Smoke cooler 12, to maintain liquid level；
Partial coagulation water in the condensed water main pipe 11 is through low temperature water-circulating pipe 26,29 and of water at low temperature circulating regulation valve
Low temperature water-circulating pump 23 returns to steam turbine low-pressure heater condensed water supervisor；
The steam flow regulating valve 14 is controlled according to the measured value of phase transition parameter sensor 13, when phase transition parameter sensor 13
Measured value is greater than phase transition parameter setting value, then 14 aperture of steam flow regulating valve increases, otherwise turns down；
Condensation water regulating valve 30 is controlled by temperature measured by flue outlet smoke temperature sensor 22, when flue outlet smoke temperature passes
Temperature measured by sensor 22 is greater than flue outlet smoke temperature setting value, then condenses the increase of 30 aperture of water regulating valve, otherwise turn down；Institute
The control for stating 18 measured value of water temperature sensor before by phase transformation water heater of air heater bypass valve 19, before phase transformation water heater
Water temperature measured by water temperature sensor 18 be higher than phase transformation water heater before water temperature setting value when, 19 aperture of air heater bypass valve
It turns down, otherwise opens big；Water temperature setting value is according to the survey of flue gas water cooler inlet water temperature sensor 9 before the phase transformation water heater
Magnitude control, when the measured value of flue gas water cooler inlet water temperature sensor 9 is higher than flue gas water cooler inlet water temperature setting value
When, water temperature setting value reduces before phase transformation water heater, otherwise increases；Measured by flue gas water cooler inlet water temperature sensor 9
Temperature be less than flue gas water cooler inlet water temperature alarming value, issue alarm signal；The flue gas water cooler inlet water temperature report
Alert value is 10-70 DEG C higher than flue gas water dew point；Alternatively, condensation water regulating valve 30 before by phase transformation water heater water temperature sensor 18 surveyed
The temperature of amount controls, and water temperature is set before temperature measured by water temperature sensor 18 is greater than phase transformation water heater before phase transformation water heater
Definite value then condenses the increase of 30 aperture of water regulating valve, otherwise turns down；Water temperature setting value is according to flue gas water before the phase transformation water heater
The measured value of cooler inlet water temperature sensor 9 controls, when the measured value of flue gas water cooler inlet water temperature sensor 9 is higher than cigarette
When vapor-water cooling device inlet water temperature setting value, water temperature setting value reduces before phase transformation water heater, otherwise increases；When cigarette vapor-water cooling
Temperature measured by device inlet water temperature sensor 9 is less than flue gas water cooler inlet water temperature alarming value, issues alarm signal；It is described
Flue gas water cooler inlet water temperature alarming value is 10-70 DEG C higher than flue gas water dew point；
The air heater bypass valve 19 by 22 measured value of flue outlet smoke temperature sensor control, when flue outlet cigarette
When smoke temperature measured by temperature sensor 22 is higher than flue outlet smoke temperature setting value, 19 aperture of air heater bypass valve is opened greatly, instead
Turn down；
Alternatively, control of the air heater bypass valve 19 by 8 measured value of flue gas water cooler exit water temperature sensor,
It is empty when the water temperature measured by the flue gas water cooler exit water temperature sensor 8 is higher than flue gas water cooler exit water temperature setting value
19 aperture of hot-air heater bypass valve is opened greatly, otherwise is turned down；
The water temperature measured by the flue gas water cooler exit water temperature sensor 8 is set lower than flue gas water cooler exit water temperature
When value, alarm signal is issued；The flue gas water cooler exit water temperature setting value is higher than 11 backwater end of condensed water main pipe and coagulates
Bear water the condensation water temperature in the condensed water supervisor at the tie point of supervisor；
The water at low temperature circulating regulation valve 29 by 4 measured value of main air temperature sensor control, when main air temperature
When spending 4 measured value of sensor higher than main air desired temperature, water at low temperature circulating regulation valve 29 is turned down, otherwise is opened big.
Embodiment 3
As shown in Fig. 2, compared to embodiment 2, the present embodiment system further include:
The flue gas water cooler 7 is made of low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a；It is described low
Warm flue gas water cooler 7b and high-temperature flue gas water cooler 7a is sequentially arranged on condensed water main pipe 11 along condensed water flow direction；
In the flue gas water cooler inlet water temperature sensor 9 and phase transformation water heater 17 on the condensed water main pipe 11
Between be provided with booster water pump 10；
The system also includes: hot water re-circulation pipe 2；
One end of the hot water re-circulation pipe 2 be connected to low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a it
Between condensed water main pipe 11 on；The other end of the hot water re-circulation pipe 2 is connected to phase transformation water heater 17 and phase transformation water adds
Condensed water main pipe 11 before hot device between water temperature sensor 18；Or the other end of the hot water re-circulation pipe 2 is connected to phase
Become the condensed water main pipe 11 between water heater 17 and booster water pump 10；
The hot water re-circulation pipe 2 is equipped with hot water re-circulation tune valve 1；
The hot water re-circulation pipe 2 is equipped with hot water re-circulation booster pump；
Height is disposed with after main air temperature sensor 4 along air flow direction on the air preheater primary air separating duct 31
Warm air heater 3 and secondary air temperature sensor 4a；
The air side of the high-temperature air heater 3 is connected with air preheater primary air separating duct 31；The high temperature air adds
The condensed water side of hot device 3 is connected with hot water re-circulation pipe 2.
The system also includes: water warmup heater 6；
The high temperature side connection of the water pre-heater 6 is in low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a
Between condensed water main pipe 11 on；
The low temperature side of the water pre-heater 6 is phase transformation evaporation and heat-exchange side, the liquid space of phase transformation evaporation and heat-exchange side
Pass through water pre-heater steam pipe and Gas phase Smoke cooler with the air space of 5 connection of fluid flow tube, phase transformation evaporation and heat-exchange side
12 vapour side connection；Or with main steam range 15 before steam flow regulating valve 14 connection.
The system also includes:
Low temperature water cooler 27 and low temperature water heater 25 are successively arranged along condensed water flow direction on low temperature water-circulating pipe 26；Institute
State the air side and 31 connection of air preheater primary air separating duct of low temperature water cooler 27；The low temperature water cooler 27 is flowed to along air
Before air heater 28；
When condensed water flows through low temperature water cooler 27 in low temperature water-circulating pipe 26, wind before air preheater is transferred heat to
The air of low temperature water cooler 27 is flowed through in road 31, air themperature increases, and condensing water temperature reduces；
When condensed water flows through low temperature water heater 25 in low temperature water-circulating pipe 26, vapour is come from low temperature water heater 25 is entered
The steam discharge heat exchange of the steam discharge or steam-driven induced draft fan steam turbine of turbine, turbine discharge are condensed, and condensed water is heated.
In the system, main steam range 15 is connected with phase transformation air heater steam supply pipe 20 after steam flow regulating valve 14；Institute
The other end for stating phase transformation air heater steam supply pipe 20 is connected on phase transformation air heater 24；The phase transformation air heater supplies
Steam pipe 20 is equipped with phase transformation air heater steam supply valve 21；The phase transformation air heater 24 is arranged in high-temperature air heater 3
On air preheater primary air separating duct 31 between air heater 28；
In the system, the condensed water main pipe 11 is connected with the bypass of phase transformation water heater before air heater 28
Pipe；The other end of the phase transformation water heater shunt valve is connected between phase transformation water heater 17 and booster water pump 10；The phase
Become on water heater shunt valve and is provided with phase transformation water heater bypass valve 16.
Based on the 2 increased components of system as directed component of institute of embodiment, the method also includes following steps:
The temperature in condensed water main pipe 11 between low-temperature flue gas water cooler 7b and high-temperature flue gas water cooler 7a compared with
High condensed water returns to condensed water main pipe 11, or the effect in hot water re-circulation booster pump under the action of booster water pump 10
Under, condensed water main pipe 11 is returned to through high-temperature air heater 3 and hot water re-circulation tune valve 1；In the high-temperature air heater 3
Interior, the higher condensed water of temperature and air conduct heat, and condensed water temperature drop is low, and air themperature increases；
The hot water re-circulation tune valve 1 controls aperture according to secondary air temperature sensor 4a measured value, works as secondary air
When temperature sensor 4a measured value is greater than secondary air desired temperature, hot water re-circulation tune valve 1 is turned down, otherwise is opened big；
The secondary air desired temperature is more than or equal to main air desired temperature；
5 inner condensat liquid of fluid flow tube enters the phase transformation evaporation and heat-exchange side of water pre-heater 6, by 6 high temperature of water pre-heater
The condensed water of side heats, and the condensate liquid of supercooling is heated to saturation temperature, and the steam of generation passes through water pre-heater steam pipe
Vapour side or main steam range 15 into Gas phase Smoke cooler 12；The condensate liquid of saturation enters the vapour in Gas phase Smoke cooler 12
Side or liquid side space.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng
It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that technical side of the invention
Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (10)
1. a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN, which is characterized in that the system comprises:
Air preheater (33), air preheater primary air separating duct (31), air preheater rear pass (32), condensed water main pipe
(11), main steam range (15), air heater (28), Gas phase Smoke cooler (12), flue gas water cooler (7), phase transformation water add
Hot device (17), condensation water regulating valve (30), steam flow regulating valve (14), fluid flow tube (5)；
Air heater (28), condensation water regulating valve are disposed with along condensed water flow direction on the condensed water main pipe (11)
(30), phase transformation water heater (17) and flue gas water cooler (7)；
The water side of the air heater (28), phase transformation water heater (17) and flue gas water cooler (7) with condensed water trunk
Manage (11) connection；
The air preheater primary air separating duct (31) and air preheater rear pass (32) air duct with air preheater (33) respectively
Inlet side and flue outlet side connection；
Air heater (28) air side and air preheater primary air separating duct (31) connection；
The fume side and air preheater rear pass (32) connection of the flue gas water cooler (7)；
The air preheater rear pass that the Gas phase Smoke cooler (12) is arranged after flue gas water cooler (7) along flue gas flow direction
(32) on, the fume side and air preheater rear pass (32) connection of the Gas phase Smoke cooler (12)；
The steam side of the Gas phase Smoke cooler (12) and phase transformation water heater (17) passes through main steam range (15) connection；It is described
Steam flow regulating valve (14) are provided in main steam range (15)；
One end of the fluid flow tube (5) is connected to the liquid feeding side of Gas phase Smoke cooler (12), the other end of the fluid flow tube (5)
It is connected to phase transformation water heater (17) vapour side lower part；Or the other end of the fluid flow tube (5) be connected to it is other to flue gas phase transformation
The equipment of cooler (12) offer condensate liquid；Liquid stream regulating valve is provided on the fluid flow tube (5)；
The bottom of the phase transformation water heater (17) is higher than the bottom of Gas phase Smoke cooler (12), it is ensured that phase transformation water heater
(17) condensate liquid in vapour side can flow back into Gas phase Smoke cooler (12) through fluid flow tube (5) by natural circulation mode；
Phase transition parameter sensor (13) is arranged on Gas phase Smoke cooler (12), for measuring in Gas phase Smoke cooler (12)
Pressure phase transition or phase transition temperature；
The air heater bypass valve (19) and sky being arranged in series the system also includes: air heater shunt valve and thereon
Hot-air heater by-pass throttle valve；
Air heater shunt valve one end is connected on the condensed water main pipe (11) before air heater (28), the other end
It is connected to phase transformation water heater (17) and condenses on the condensed water main pipe (11) between water regulating valve (30).
2. a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The system also includes: water temperature sensor (18), flue gas water cooler inlet water temperature sensor before phase transformation water heater
(9), flue gas water cooler exit water temperature sensor (8), main air temperature sensor (4) and flue outlet smoke temperature sensor
(22)；
Water temperature sensor (18) is arranged in the air heater shunt valve and condensed water main pipe before the phase transformation water heater
(11) between the tie point and phase transformation water heater (17) between phase transformation water heater (17) and condensation water regulating valve (30)
On condensed water main pipe (11)；
The flue gas water cooler inlet water temperature sensor (9) is arranged in phase transformation water heater (17) and flue gas water cooler (7)
Between condensed water main pipe (11) on；
The condensed water main pipe that the flue gas water cooler exit water temperature sensor (8) is arranged after flue gas water cooler (7)
(11) on；
Wind is arranged before the air preheater after air heater (28) along air flow direction in the main air temperature sensor (4)
On road (31)；
The air preheat that the flue outlet smoke temperature sensor (22) is arranged after Gas phase Smoke cooler (12) along flue gas flow direction
On device rear pass (32).
3. a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The low temperature water-circulating pump (23) and water at low temperature circulation being arranged the system also includes: low temperature water-circulating pipe (26) and thereon
Regulating valve (29)；
Described low temperature water-circulating pipe (26) one end is connected to air heater (28) and condenses the condensation between water regulating valve (30)
On water main pipe (11)；Before the other end is connected to the lowest temperature grade low-pressure heater on steam turbine low-pressure heater condensed water supervisor
Or before gland heater.
4. a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The flue gas water cooler (7) is made of low-temperature flue gas water cooler (7b) and high-temperature flue gas water cooler (7a)；It is described
Low-temperature flue gas water cooler (7b) and high-temperature flue gas water cooler (7a) are flowed to along condensed water is sequentially arranged in condensed water main pipe
(11) on；
In the flue gas water cooler inlet water temperature sensor (9) and phase transformation water heater on the condensed water main pipe (11)
(17) booster water pump (10) are provided between；
The system also includes: hot water re-circulation pipe (2)；
One end of the hot water re-circulation pipe (2) is connected to low-temperature flue gas water cooler (7b) and high-temperature flue gas water cooler (7a)
Between condensed water main pipe (11) on；The other end of the hot water re-circulation pipe (2) be connected to phase transformation water heater (17) and
Condensed water main pipe (11) before phase transformation water heater between water temperature sensor (18)；Or the hot water re-circulation pipe (2)
The other end is connected to the condensed water main pipe (11) between phase transformation water heater (17) and booster water pump (10)；
The hot water re-circulation pipe (2) is equipped with hot water re-circulation tune valve (1)；
Height is disposed with after main air temperature sensor (4) along air flow direction on the air preheater primary air separating duct (31)
Warm air heater (3) and secondary air temperature sensor (4a)；
The air side of the high-temperature air heater (3) is connected with air preheater primary air separating duct (31)；The high temperature air adds
The condensed water side of hot device (3) is connected with hot water re-circulation pipe (2).
5. a kind of air preheating system of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN according to claim 4, which is characterized in that
The system also includes water pre-heater (6)；
The high temperature side connection of the water pre-heater (6) is in low-temperature flue gas water cooler (7b) and high-temperature flue gas water cooler
On condensed water main pipe (11) between (7a)；
The low temperature side of the water pre-heater (6) be phase transformation evaporation and heat-exchange side, the liquid space of phase transformation evaporation and heat-exchange side with
Fluid flow tube (5) connection；The air space of phase transformation evaporation and heat-exchange side passes through water pre-heater steam pipe and Gas phase Smoke cooler
(12) vapour side connection, or with main steam range (15) before steam flow regulating valve (14) connection.
6. the air preheating system of -5 any a kind of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT INs according to claim 1, feature
It is,
Low temperature water cooler (27) and low temperature water heater (25) are successively arranged along condensed water flow direction on low temperature water-circulating pipe (26)；
The air side and air preheater primary air separating duct (31) connection of the low temperature water cooler (27)；Low temperature water cooler (27) edge
Before air flow direction is located at air heater (28)；
The low temperature water cooler (27) is before the blower that air flow direction is located on air preheater primary air separating duct (31), so that low temperature
Water cooler (27) has bigger heat transfer temperature difference, and condensed water temperature drop can be made low more；
When low temperature water-circulating pipe (26) interior condensed water flows through low temperature water cooler (27), transfers heat to and flow through water at low temperature cooling
The air of device (27), air themperature increase, and condensing water temperature reduces；
When low temperature water-circulating pipe (26) interior condensed water flows through low temperature water heater (25), come from into low temperature water heater (25)
The steam discharge heat exchange of the steam discharge or steam-driven induced draft fan steam turbine of steam turbine, turbine discharge are condensed, and condensed water is heated.
7. the air preheating system of -5 any a kind of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT INs according to claim 1, feature
It is,
In the system, main steam range (15) is connected with phase transformation air heater steam supply pipe (20) after steam flow regulating valve (14)；
The other end of the phase transformation air heater steam supply pipe (20) is connected on phase transformation air heater (24)；The phase changing air adds
Hot device steam supply pipe (20) is equipped with phase transformation air heater steam supply valve (21)；The phase transformation air heater (24) is arranged in high temperature
On air preheater primary air separating duct (31) between air heater (3) and air heater (28)；
In the system, the condensed water main pipe (11) is connected with the bypass of phase transformation water heater before air heater (28)
Pipe；The other end of the phase transformation water heater shunt valve is connected between phase transformation water heater (17) and booster water pump (10)；Institute
It states and is provided with phase transformation water heater bypass valve (16) on phase transformation water heater shunt valve.
8. a kind of air preheat method of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN, the described method comprises the following steps:
Condensed water in steam turbine low-pressure heater condensed water supervisor flows through air heater by condensed water main pipe (11)
(28), it is returned to after condensation water regulating valve (30), phase transformation water heater (17) and flue gas water cooler (7) in condensed water supervisor；
When the interior air of the air preheater primary air separating duct (31) flows through air heater (28), the condensed water heating flowed through, so
Enter air preheater (33) afterwards；
The interior air of the air preheater primary air separating duct (31) and air preheater rear pass (32) interior flue gas flow through air preheater
(33) Shi Huanre, smoke temperature reduce, and air themperature further increases；
Partial heat is transmitted to condensed water when the interior flue gas of the air preheater rear pass (32) flows through flue gas water cooler (7),
Temperature rise of condensate is high, and smoke temperature further decreases；
When the interior flue gas of the air preheater rear pass (32) flows through Gas phase Smoke cooler (12), partial heat is transmitted to flue gas
Saturation condensate liquid in Phase cooling device (12) makes saturation condensate liquid undergo phase transition generation steam, and smoke temperature further decreases；
The steam that the interior phase transformation of Gas phase Smoke cooler (12) generates enters through main steam range (15) and steam flow regulating valve (14)
Phase transformation water heater (17), heating flow through the condensed water of phase transformation water heater (17), and steam is condensed into condensate liquid, and condensed water is added
Heat heating；
When the interior liquid level of the Gas phase Smoke cooler (12) is low, the regulating valve on fluid flow tube (5) is opened greatly, condensate liquid from fluid flow tube into
Enter in Gas phase Smoke cooler (12), to maintain liquid level；
Partial coagulation water in the condensed water main pipe (11) is through low temperature water-circulating pipe (26), water at low temperature circulating regulation valve (29)
Steam turbine low-pressure heater condensed water supervisor is returned to low temperature water-circulating pump (23)；
The steam flow regulating valve (14) controls according to the measured value of phase transition parameter sensor (13), when phase transition parameter sensor (13)
Measured value be greater than phase transition parameter setting value, then steam flow regulating valve (14) aperture increase, otherwise turn down；
Condensation water regulating valve (30) is controlled by temperature measured by flue outlet smoke temperature sensor (22), when flue outlet smoke temperature passes
Temperature measured by sensor (22) is greater than flue outlet smoke temperature setting value, then condenses the increase of water regulating valve (30) aperture, otherwise close
It is small；
The control of the air heater bypass valve (19) water temperature sensor (18) measured value before by phase transformation water heater, works as phase transformation
Before water heater water temperature measured by water temperature sensor (18) be higher than phase transformation water heater before water temperature setting value when, air heater
Bypass valve (19) aperture turns down, otherwise opens big；
Water temperature setting value is according to the measured value control of flue gas water cooler inlet water temperature sensor (9) before the phase transformation water heater
System, when the measured value of flue gas water cooler inlet water temperature sensor (9) is higher than flue gas water cooler inlet water temperature setting value, phase
Water temperature setting value reduces before becoming water heater, otherwise increases；
The temperature measured by the flue gas water cooler inlet water temperature sensor (9) is alarmed less than flue gas water cooler inlet water temperature
Value issues alarm signal；The flue gas water cooler inlet water temperature alarming value is 10-70 DEG C higher than flue gas water dew point；
Alternatively, control of the air heater bypass valve (19) by flue gas water cooler exit water temperature sensor (8) measured value,
When the water temperature measured by the flue gas water cooler exit water temperature sensor (8) is higher than flue gas water cooler exit water temperature setting value,
Air heater bypass valve (19) aperture is opened greatly, otherwise is turned down；
The water temperature measured by the flue gas water cooler exit water temperature sensor (8) is lower than flue gas water cooler exit water temperature setting value
When, issue alarm signal；The flue gas water cooler exit water temperature setting value is higher than condensed water main pipe (11) backwater end and coagulates
Bear water the condensation water temperature in the condensed water supervisor at the tie point of supervisor；
The water at low temperature circulating regulation valve (29) by main air temperature sensor (4) measured value control, when main air temperature
When spending sensor (4) measured value higher than main air desired temperature, water at low temperature circulating regulation valve (29) is turned down, otherwise is opened big.
9. a kind of air preheat method of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN according to claim 8, the method are also wrapped
Include following steps:
The temperature in condensed water main pipe (11) between low-temperature flue gas water cooler (7b) and high-temperature flue gas water cooler (7a)
Higher condensed water returns under the action of booster water pump (10) through high-temperature air heater (3) and hot water re-circulation tune valve (1)
Condensed water main pipe (11)；In the high-temperature air heater (3), the higher condensed water of temperature and air conduct heat, and coagulate
It is low to bear water temperature drop, air themperature increases；
The hot water re-circulation tune valve (1) controls aperture according to secondary air temperature sensor (4a) measured value, works as secondary air
When temperature sensor (4a) measured value is greater than secondary air desired temperature, hot water re-circulation tune valve (1) is turned down, otherwise is opened big；
The secondary air desired temperature is more than or equal to main air desired temperature.
10. a kind of air preheat method of sub-control phase-transition comprehensive UTILIZATION OF VESIDUAL HEAT IN according to claim 8, the method are also wrapped
Include following steps:
Fluid flow tube (5) inner condensat liquid enters the phase transformation evaporation and heat-exchange side of water pre-heater (6), by water pre-heater (6) height
The condensed water of warm side heats, and the condensate liquid of supercooling is heated to saturation temperature, and the steam of generation passes through water pre-heater steam
Pipe enters vapour side or the main steam range (15) of Gas phase Smoke cooler (12)；The condensate liquid of saturation enters Gas phase Smoke cooler
(12) vapour side or liquid side space in.
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| CN106969373A (en) | 2017-07-21 |
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