CN106949521B - A kind of heat supply remodeling method for realizing the operation of turbine condenser high vacuum - Google Patents
A kind of heat supply remodeling method for realizing the operation of turbine condenser high vacuum Download PDFInfo
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- CN106949521B CN106949521B CN201710213037.6A CN201710213037A CN106949521B CN 106949521 B CN106949521 B CN 106949521B CN 201710213037 A CN201710213037 A CN 201710213037A CN 106949521 B CN106949521 B CN 106949521B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/10—Auxiliary systems, arrangements, or devices for extracting, cooling, and removing non-condensable gases
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Abstract
The present invention provides a kind of turbine condenser high vacuum operation heat supply process, and the system configuration and transformation operation method of the technology are provided, the system configuration mainly includes steam turbine high-pressure cylinder, intermediate pressure cylinder, low pressure (LP) cylinder, mesolow cylinder contact regulating butterfly valve, water ring vacuum pump, preposition vacuum extractor, preposition vacuum extractor isolation stop valve, preposition vacuum extractor bypass stop valve and the valve and pipe fitting that connect the said equipment.The present invention improves turbine condenser end vacuum using preposition vacuum extractor, heat supply period is allowd to improve condenser vacuum operation, so as to reduce low pressure (LP) cylinder minimum through-current capacity, you can arrange extraction for heat supply ability in increase steam turbine, unit vacuum can be improved again to reach energy-saving purpose.The simple low cost of the technological transformation, it is adapted to not transform in turbine body and is applied on the unit of needs increase heat capacity.And technical principle and embodiment to improving Steam Turbine Condenser Vacuum operation increase unit heat capacity have also made corresponding introduction.
Description
Technical field
The present invention relates to the application field of thermal power generation unit, changes more particularly, to thermal power generation unit increase heat capacity
The method made.
Background technology
Present Thermal Power accounts for 65% or so of national installed capacity, it is anticipated that the thermoelectricity within the following quite a long time
It all will be the important component of China's energy resource system.Energy-saving and emission-reduction are the state basic policies that China's economy realizes sustainable development.For
Thermal power industry, cogeneration of heat and power transformation is carried out, is the important means for realizing national energy-saving emission reduction targets.Currentlyying propel the energy
Under the overall background of revolution, the cogeneration of heat and power opportunity to develop rare by a new round is welcome is intelligent, to clean, standardize will be it
Important Characteristics of Development, it will more be highlighted in the status in coal fired power generation field.With the quickening of urbanization process, city needs
The area of central heating gradually increases, and northern area surrounding city pure condensate unit has been changed to extraction condensing type thermal power plant unit, root substantially
There is the demand by transforming increase heat capacity according to growth requirement some extraction condensing type thermal power plant units.
The cogeneration of heat and power forms of modification of the extraction condensing type unit heat capacity of main flow increase at present has following several：
1st, Heat Supplying with Low Vacuum is transformed：Alternatively referred to as high back pressure heat supply renovation technique, the technology are to transport turbine condenser
Row back pressure brings up to 30-50kPa or so so that turbine discharge can directly heat heat supply network recirculated water, can heat heat supply network circulation
Water is to 70-80 DEG C, and in order to solve, exhaust temperature is high and blade flutter, Heating Period need to be replaced with the heat supply low pressure specially designed and turn
Son, heat supply gain pure condensate low pressure rotor after terminating.The technological merit is：Heating load is big, in the case that area of heat-supply service is sufficiently large
Cold section of loss of steam turbine can be reduced to zero, burden requirement is stable, safe.Shortcoming is：Invest it is bigger than normal, need to increase heat supply network circulation
Water, row, which draws gas, during heat supply peak period needs carries out spike heating, needs routine replacement rotor every year, reduces unit load regulation
Flexibility, it is impossible to adapt to relatively low electric load operation.
2nd, lithium bromide absorption type heat pump heat supply is transformed：The technology be using lithium-bromide solution as working medium, using middle row draw gas as
Steam is driven, reclaims cooling circulating water waste heat, using heat pump by heat supply network circulating-heating to 70-90 DEG C, heating peak period passes through again
Middle row, which draws gas, to be heated to heat user demand temperature and confesses.The technological merit is：Larger transformation is not carried out to turbine body, can increased
Add unit heat capacity, flexible operation, do not influence Steam Turbine on-load, it is low to the temperature requirement of low temperature exhaust heat, it is not necessary to drop
Low unit vacuum.Shortcoming is：Huge, lithium bromide heat pump short life is invested, maintenance workload is larger.
3rd, low pressure (LP) cylinder optical axis is transformed：The technology is that Low Pressure Steam Turbine is replaced by into optical axis so that intermediate pressure cylinder steam discharge can
Whole heat supplies, to sacrifice part generating capacity as cost, low pressure rotor is replaced with optical axis, functions only as being connected work with generator
With.The technological merit is：Safe, counter investment is smaller, and increase heat capacity is larger.Shortcoming is：Set for middle row pressure power
Haggle over high unit, consider intermediate pressure cylinder blade security, less adapt to transformation, performance driving economy is poor after transformation, influences to generate electricity
Measure more.
Application number：201510739574.5 Chinese invention patent discloses pure condensate --- high back pressure circulating water heating double mode
Single rotor steam turbine and its system, the system include steam turbine in be sequentially connected high pressure cylinder, intermediate pressure cylinder, mesolow clutch,
Low pressure (LP) cylinder, low pressure clutch and generator, low pressure (LP) cylinder inlet valve is connected between intermediate pressure cylinder and low pressure (LP) cylinder, is provided with low pressure (LP) cylinder
Low pressure rotor, is provided with some grade blades on low pressure rotor, pure condensate steam turbine of the final blade length in blade than ad eundem
Exhaust stage blade is short, and final blade length is longer than the high back pressure circulating water heating last stage vane of steam turbine of ad eundem.The invention has
Beneficial effect is when replacing with non-heating period pure condensate the high back pressure circulating water heating phase entirely different without shutting down exchange blade two
It root low pressure (LP) cylinder rotor, need to not only shut down using same roots rotor, reach that summer heat consumption is high, winter cold source energy is zero
Purpose safety monitoring device and high back pressure circulating water heating meet an urgent need thermal device ensure that exhaust stage blade dynamic stress does not transfinite.Should
Technology is to improve turbine discharge back pressure, that is, reduces condenser vacuum, heat supply network recirculated water is directly heated with steamer vapour steam discharge.In addition
The technology need to do a series of transformations to turbine body, and improvement expenses is higher, and difficulty of construction is big, cycle length.The patent and this hair
The bright technology path has an essential distinction, and system of the present invention is without transform turbine body, and technical approach is to carry
Pump gas ablity is arranged in high vacuum operation increase, transformation amount is smaller, and expense is low.
Application number：CN201610251992.4 Chinese invention patents disclose a kind of optical axis high back pressure heat supply steam turbine, it
It is related to a kind of heat supply steam turbine.The invention solves existing butterfly valve and adjusts steam extraction heat supply unit under supplying thermal condition, low pressure rotor
Air blast fever phenomenon is also easy to produce, and the problem of generatine set heat efficiency is low, and heat supply pump gas ablity is poor.The low pressure rotor of the invention is light
Axle rotor, the upper end of low pressure (LP) cylinder are provided with two low pressure admission mouths, and each low pressure admission mouth is respectively tightly connected with a closure plate, heating
The lower end of extraction line connects with two middle pressure gas ports above intermediate pressure cylinder, is opened respectively on the upper end tube wall of heating extraction line
Provided with the first steam supply mouth and the second steam supply mouth, the first steam supply mouth is connected with existing heat exchangers for district heating, and the second steam supply mouth steams with cooling
One end connection in steam pipe road, the other end of cooling steam pipeline pass through one of closure plate and connected with corresponding low pressure admission mouth,
Reducing-and-cooling plant is arranged in cooling steam pipeline.The invention need to carry out optical axis transformation to turbine low pressure cylinder rotor, sacrifice
Unit part generating capacity, performance driving economy is poor, and improvement expenses is higher, has essential distinction with technology of the present invention.
To sum up, in the prior art the defects of, essentially consists in：
1st, Heat Supplying with Low Vacuum is transformed：Invest bigger than normal, need to increase heat supply network quantity of circulating water, row draws gas progress during heat supply peak period needs
Spike heats, and needs routine replacement rotor every year, reduces unit load flexible adjustment, it is impossible to adapts to relatively low electric load fortune
OK.
2nd, lithium bromide absorption type heat pump heat supply is transformed：Huge, lithium bromide heat pump short life is invested, maintenance workload is larger.
3rd, low pressure (LP) cylinder optical axis is transformed：Invest larger, for the higher unit of middle row's pressure design, consider intermediate pressure cylinder blade peace
Quan Xing, transformation is less adapted to, performance driving economy is poor after transformation, and it is more to influence generated energy.
The content of the invention
In order to overcome drawbacks described above of the prior art, the invention provides a kind of thermal power generation unit to increase heat capacity
The technology of transformation, any transformation is not carried out to turbine body, only need to increase preposition vacuum extractor and its isolation and bypass valve
Door, Steam Turbine Condenser Vacuum is improved in operation, to reduce low pressure (LP) cylinder minimum through-current capacity, so as to arrange the amount of drawing gas increase machine in increasing
Group heat capacity.And technological investment of the present invention is small, long lifespan, maintenance workload is smaller.Further, change with respect to optical axis
Radiography sound generated energy is less, is adapted to all extraction and condensing units to carry out heat capacities increase transformation.To sum up, technology of the present invention is increasing
The technical thought in terms of heat capacity is added to be different from existing any technology, need to only transform on a small quantity can increase larger heat supply energy
Power.
In order to solve the above problems, a kind of turbine condenser high vacuum operation heat supply process is invented, and provide the skill
The system configuration and transformation operation method, the system configuration of art mainly include steam turbine high-pressure cylinder（101）, Steam Turbine Through IP Admission
(102), turbine low pressure cylinder (103), generator（104）, condenser（105）, heat exchangers for district heating（106）, water ring vacuum pump
（107）, preposition vacuum extractor（108）, mesolow cylinder contact regulating butterfly valve（109）, preposition vacuum extractor isolation stop valve
（110）, preposition vacuum extractor bypass stop valve（111）, heat supply extraction stop valve（112）, main steam（201）, reheated steam
（202）, water ring vacuum pump row's air（203）, heat supply network backwater（204）, heat supply network water supply（205）, heat exchangers for district heating is hydrophobic（206）,
And the valve and pipe fitting of connection the said equipment.
This patent system schematic is shown in accompanying drawing 1:Main steam in the system（201）Into steam turbine high-pressure cylinder（101）
After finishing work(, reheated device continues to heat, the reheated steam after heating（202）Into Steam Turbine Through IP Admission (102), intermediate pressure cylinder row
Vapour gets in touch with regulating butterfly valve through mesolow cylinder all the way（109）Continue to do work into turbine low pressure cylinder (103), connection is hot all the way in addition
Net heater（106）To heat heat supply network backwater（204）, heated heat supply network supplies water（205）It is supplied to heat user, heat supply network heating
Device is hydrophobic（206）Picked out through heat exchangers for district heating bottom, drain recovery to condenser hotwell；Condenser（105）It is connected with low pressure (LP) cylinder
Connect, generator（104）It is coaxially connected with steam turbine, the mechanical work of steam turbine is converted into electric energy；Draw in condenser supercooling region
Main pipe is vacuumized, main pipe isolates stop valve through preposition vacuum extractor all the way（110）, preposition vacuum extractor（108）It is led to water
Ring vacuum pump（107）Arrange air by the road again（203）, bypass stop valve through preposition vacuum extractor all the way in addition（111）Directly
It is led to that water ring vacuum pump arranges air by the road again, two-way can switch under different unit operation operating modes.
Turbine condenser high vacuum runs heat supply scheme：Open preposition vacuum extractor isolation stop valve（110）, open
Preposition vacuum extractor（108）, close preposition vacuum extractor bypass stop valve（111）, work as condenser（105）Vacuum is near
2kPa or so, suitably turn mesolow cylinder contact regulating butterfly valve down（109）Aperture, you can the increase intermediate pressure cylinder steam discharge amount of drawing gas, reach
Increase the purpose of unit heat capacity.
System of the present invention realizes that unit increase heat capacity key point has at following 2 points：Determine that low pressure (LP) cylinder minimum is through-flow
Amount, improve condenser vacuum.
First, low pressure (LP) cylinder minimum through-current capacity is determined
Volume flow before turbine low pressure cylinder exhaust stage blade is too small, can occur flow separation at blade root first, occurs
Whirlpool is flowed back, and at this moment steam does not do work not only, also has the opposite effect, and produces air blast, causes final stage efficiency drastically to decline, in the process of running
Avoid the generation of air blast phenomenon.It is generally acknowledged that unit may occur in higher back pressure underload because volume flow reduces
Air blast.And the presence of Overblow state so that rise from blade root to the steam temperature in the about 45% high region of leaf, turn into superheated steam, so
Unit is in higher back pressure little volume flow, if pole when low pressure (LP) cylinder exhaust temperature is higher than the saturation temperature under exhaust steam pressure corresponds to
It is possible to have occurred and that air blast phenomenon, is at this moment intervened.In general extraction condensing sets run, low pressure (LP) cylinder has a minimum volume
Flow restriction, for general extraction and condensing unit back pressure in 4.9-6kPa or so, low pressure (LP) cylinder minimum mass flow is 120-145t/h or so,
If unit back pressuce is reduced into 1.5-2kPa, in the case where minimum volume flow restriction is constant, then low pressure (LP) cylinder minimum mass stream
Measure as 39-51t/h.Row's amount of drawing gas in 81-94 t/h can be increased, realize the increase of unit heat capacity.
2nd, condenser vacuum is improved
Condenser vacuum determines the size of the minimum through-flow mass flow of low pressure (LP) cylinder, and it is crucial for the present invention how to improve vacuum
One of point, for power plant's pumped vacuum systems, because vacuum capability is poor under water ring pump low pressure conditions, generally below
10KPa efficiency drastically declines, and the preposition vacuum extractor that the present invention chooses（108）Vacuum capability with the reduction of pressure
Change is smaller, therefore by preposition vacuum extractor（108）It is connected on before water ring vacuum pump, sets up preposition vacuum extractor isolation
Stop valve（110）, preposition vacuum extractor bypass stop valve（111）, during into Heating Period, open preposition vacuum extractor isolation
Stop valve（110）, open preposition vacuum extractor（108）, close preposition vacuum extractor bypass stop valve（111）It can improve
Unit condenser vacuum.If original system is equipped with two water ring vacuum pumps, preposition vacuum extractor of connecting（108）The water ring of configuration is true
Empty pump is the small water ring vacuum pump that unit original system water ring vacuum pump is either newly purchased, and small Water-ring vacuum pump power is less than raw water
Ring vacuum pump power, but not less than the 1/3 of raw water ring vacuum pump power.
Using the method for the present invention, relative to prior art, can advantage is obtained that：
1st, technology of the present invention, any transformation is not carried out to turbine body, need to only increase preposition vacuum extractor and
It is isolated and bypass valve, Steam Turbine Condenser Vacuum is improved in operation, to reduce low pressure (LP) cylinder minimum through-current capacity, in increasing
Arrange the amount of drawing gas increase unit heat capacity.
2nd, system investments of the present invention are small, long lifespan, and maintenance workload is smaller.
3rd, relative optical axis transformation influence generated energy is less, is adapted to all extraction and condensing units to carry out heat capacity increase transformation.
4th, technical thought of the technology of the present invention in terms of heat capacity is increased is different from existing any technology, need to only lack
Amount transformation can increase larger heat capacity.
Brief description of the drawings
Next, by refer to the attached drawing, the invention will be further described, wherein：
Fig. 1：High vacuum runs heating system schematic diagram
In figure：Steam turbine high-pressure cylinder（101）, Steam Turbine Through IP Admission (102), turbine low pressure cylinder (103), generator
（104）, condenser（105）, heat exchangers for district heating（106）, water ring vacuum pump（107）, preposition vacuum extractor（108）, mesolow
Cylinder gets in touch with regulating butterfly valve（109）, preposition vacuum extractor isolation stop valve（110）, preposition vacuum extractor bypass stop valve
（111）, heat supply extraction stop valve（112）, main steam（201）, reheated steam（202）, water ring vacuum pump row's air（203）, heat
Net backwater（204）, heat supply network water supply（205）, heat exchangers for district heating is hydrophobic（206）
Embodiment
Refer to the attached drawing 1, the invention provides a kind of technology of thermal power generation unit increase heat capacity transformation, not to steamer
Machine body carries out any transformation, only need to increase preposition vacuum extractor and its isolation and bypass valve, steam turbine is improved in operation
Condenser vacuum, to reduce low pressure (LP) cylinder minimum through-current capacity, so as to arrange the amount of drawing gas increase unit heat capacity in increasing.And this hair
The bright technological investment is small, long lifespan, and maintenance workload is smaller.Further, it is less with respect to optical axis transformation influence generated energy, fit
Close all extraction and condensing units and carry out heat capacity increase transformation.To sum up, skill of the technology of the present invention in terms of heat capacity is increased
Art thinking is different from existing any technology, and need to only transform on a small quantity can increase larger heat capacity.
In order to solve the above problems, a kind of turbine condenser high vacuum operation heat supply process is invented, and provide the skill
The system configuration and transformation operation method, the system configuration of art mainly include steam turbine high-pressure cylinder（101）, Steam Turbine Through IP Admission
(102), turbine low pressure cylinder (103), generator（104）, condenser（105）, heat exchangers for district heating（106）, water ring vacuum pump
（107）, preposition vacuum extractor（108）, mesolow cylinder contact regulating butterfly valve（109）, preposition vacuum extractor isolation stop valve
（110）, preposition vacuum extractor bypass stop valve（111）, heat supply extraction stop valve（112）, main steam（201）, reheated steam
（202）, water ring vacuum pump row's air（203）, heat supply network backwater（204）, heat supply network water supply（205）, heat exchangers for district heating is hydrophobic（206）,
And the valve and pipe fitting of connection the said equipment.
This patent system schematic is shown in accompanying drawing 1:Main steam in the system（201）Into steam turbine high-pressure cylinder（101）
After finishing work(, reheated device continues to heat, the reheated steam after heating（202）Into Steam Turbine Through IP Admission (102), intermediate pressure cylinder row
Vapour gets in touch with regulating butterfly valve through mesolow cylinder all the way（109）Continue to do work into turbine low pressure cylinder (103), connection is hot all the way in addition
Net heater（106）To heat heat supply network backwater（204）, heated heat supply network supplies water（205）It is supplied to heat user, heat supply network heating
Device is hydrophobic（206）Picked out through heat exchangers for district heating bottom, drain recovery to condenser hotwell；Condenser（105）It is connected with low pressure (LP) cylinder
Connect, generator（104）It is coaxially connected with steam turbine, the mechanical work of steam turbine is converted into electric energy；Draw in condenser supercooling region
Main pipe is vacuumized, main pipe isolates stop valve through preposition vacuum extractor all the way（110）, preposition vacuum extractor（108）It is led to water
Ring vacuum pump（107）Arrange air by the road again（203）, bypass stop valve through preposition vacuum extractor all the way in addition（111）Directly
It is led to that water ring vacuum pump arranges air by the road again, two-way can switch under different unit operation operating modes.
Turbine condenser high vacuum runs heat supply scheme：Open preposition vacuum extractor isolation stop valve（110）, open
Preposition vacuum extractor（108）, close preposition vacuum extractor bypass stop valve（111）, work as condenser（105）Vacuum is near
2kPa or so, suitably turn mesolow cylinder contact regulating butterfly valve down（109）Aperture, you can the increase intermediate pressure cylinder steam discharge amount of drawing gas, reach
Increase the purpose of unit heat capacity.
System of the present invention realizes that unit increase heat capacity key point has at following 2 points：Determine that low pressure (LP) cylinder minimum is through-flow
Amount, improve condenser vacuum.
First, low pressure (LP) cylinder minimum through-current capacity is determined
Volume flow before turbine low pressure cylinder exhaust stage blade is too small, can occur flow separation at blade root first, occurs
Whirlpool is flowed back, and at this moment steam does not do work not only, also has the opposite effect, and produces air blast, causes final stage efficiency drastically to decline, in the process of running
Avoid the generation of air blast phenomenon.It is generally acknowledged that unit may occur in higher back pressure underload because volume flow reduces
Air blast.And the presence of Overblow state so that rise from blade root to the steam temperature in the about 45% high region of leaf, turn into superheated steam, so
Unit is in higher back pressure little volume flow, if pole when low pressure (LP) cylinder exhaust temperature is higher than the saturation temperature under exhaust steam pressure corresponds to
It is possible to have occurred and that air blast phenomenon, is at this moment intervened.In general extraction condensing sets run, low pressure (LP) cylinder has a minimum volume
Flow restriction, for general extraction and condensing unit back pressure in 4.9-6kPa or so, low pressure (LP) cylinder minimum mass flow is 120-145t/h or so,
If unit back pressuce is reduced into 1.5-2kPa, in the case where minimum volume flow restriction is constant, then low pressure (LP) cylinder minimum mass stream
Measure as 39-51t/h.Row's amount of drawing gas in 81-94 t/h can be increased, realize the increase of unit heat capacity.
2nd, condenser vacuum is improved
Condenser vacuum determines the size of the minimum through-flow mass flow of low pressure (LP) cylinder, and it is crucial for the present invention how to improve vacuum
One of point, for power plant's pumped vacuum systems, because vacuum capability is poor under water ring pump low pressure conditions, generally below
10KPa efficiency drastically declines, and the preposition vacuum extractor that the present invention chooses（108）Vacuum capability with the reduction of pressure
Change is smaller, therefore by preposition vacuum extractor（108）It is connected on before water ring vacuum pump, sets up preposition vacuum extractor isolation
Stop valve（110）, preposition vacuum extractor bypass stop valve（111）, during into Heating Period, open preposition vacuum extractor isolation
Stop valve（110）, open preposition vacuum extractor（108）, close preposition vacuum extractor bypass stop valve（111）It can improve
Unit condenser vacuum.If original system is equipped with two water ring vacuum pumps, preposition vacuum extractor of connecting（108）The water ring of configuration is true
Empty pump is the small water ring vacuum pump that unit original system water ring vacuum pump is either newly purchased, and small Water-ring vacuum pump power is less than raw water
Ring vacuum pump power, but not less than the 1/3 of raw water ring vacuum pump power.
Using the method for the present invention, relative to prior art, can advantage is obtained that：
1st, technology of the present invention, any transformation is not carried out to turbine body, need to only increase preposition vacuum extractor and
It is isolated and bypass valve, Steam Turbine Condenser Vacuum is improved in operation, to reduce low pressure (LP) cylinder minimum through-current capacity, in increasing
Arrange the amount of drawing gas increase unit heat capacity.
2nd, system investments of the present invention are small, long lifespan, and maintenance workload is smaller.
3rd, relative optical axis transformation influence generated energy is less, is adapted to all extraction and condensing units to carry out heat capacity increase transformation.
4th, technical thought of the technology of the present invention in terms of heat capacity is increased is different from existing any technology, need to only lack
Amount transformation can increase larger heat capacity.
Example explanation：
1 330MW sucking condensing turbine group of certain power plant, steam turbine model：C330/262-16.7/0.49/538/538, should
Steam turbine maximum is drawn gas when the amount of drawing gas 550t/h is arranged in operating mode, unit low pressure (LP) cylinder minimum mass through-current capacity about 145t/h, the unit back of the body
4.9kPa is pressed, steam discharge enthalpy about 2320.4kJ/kg, corresponding steam discharge specific volume is 25.89m3/ kg, as the power plant undertakes heat supply
The increase of area, the transformation demand of existing increase unit heat capacity.
Transformed according to system and method described in the technology of the present invention, specially increase preposition vacuum extractor, preposition take out
Vacuum plant isolation stop valve, preposition vacuum extractor bypass stop valve and corresponding pipeline modification.
After transformation after Heating Period input modernization system, turbine condenser back pressure is controlled in 2kPa or so, not changed
On the premise of turbine low pressure cylinder minimum volume flow, when unit back pressuce 2kPa is run, corresponding steam discharge specific volume is 60.93 m3/
Kg, corresponding unit low pressure (LP) cylinder minimum mass through-current capacity are changed into 61.6 t/h.
Arranging the amount of drawing gas after transformation in unit can increase by 83.4 t/h, and in the case that main vapour amount is constant, maximum is drawn gas in operating mode
Row's maximum amount of drawing gas can increase to 633.4t/h.Correctional effect is obvious.
Preposition vacuum extractor in system described in the technology of the present invention（108）Can be centrifugal vacuum pump, or steam
Injector and Roots type vacuum pump.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changed, replacing and modification, and these change, modification, replacement and modification are also considered as the protection model of the present invention
Enclose.
Claims (2)
1. a kind of heat supply remodeling method for realizing the operation of turbine condenser high vacuum, does not carry out any change to turbine body
Make, only need to increase preposition vacuum extractor and its isolation and bypass valve, Steam Turbine Condenser Vacuum is improved in operation, to reduce
Low pressure (LP) cylinder minimum through-current capacity, so as to arrange the amount of drawing gas increase unit heat capacity in increasing, it is characterised in that：
The system configuration being related to mainly includes steam turbine high-pressure cylinder (101), Steam Turbine Through IP Admission (102), turbine low pressure cylinder
(103), generator (104), condenser (105), heat exchangers for district heating (106), water ring vacuum pump (107), preposition vacuum extractor
(108), mesolow cylinder contact regulating butterfly valve (109), preposition vacuum extractor isolation stop valve (110), preposition vacuum extractor
Stop valve (111) is bypassed, heat supply extraction stop valve (112), main steam (201), reheated steam (202), water ring vacuum pump row is greatly
Gas (203), heat supply network backwater (204), heat supply network supply water (205), and heat exchangers for district heating is hydrophobic (206), and the valve of connection the said equipment
Door and pipe fitting；
After main steam (201) finishes work(into steam turbine high-pressure cylinder (101) in the system, reheated device continues to heat, heating
Reheated steam (202) afterwards enters Steam Turbine Through IP Admission (102), and intermediate pressure cylinder steam discharge gets in touch with regulating butterfly valve through mesolow cylinder all the way
(109) continue to do work into turbine low pressure cylinder (103), connect heat exchangers for district heating (106) all the way in addition and returned to heat heat supply network
Water (204), heated heat supply network water supply (205) are supplied to heat user, and heat exchangers for district heating hydrophobic (206) is through heat exchangers for district heating bottom
Pick out, drain recovery to condenser hotwell；Condenser (105) is connected with low pressure (LP) cylinder, and generator (104) coaxially connects with steam turbine
Connect, the mechanical work of steam turbine is converted into electric energy；Condenser supercooling region, which is drawn, vacuumizes main pipe, and main pipe is taken out very through preposition all the way
Empty device isolation stop valve (110), preposition vacuum extractor (108) are led to that water ring vacuum pump (107) arranges air by the road again
(203), bypass stop valve (111) through preposition vacuum extractor all the way in addition and be directly led to that water ring vacuum pump is arranged greatly by the road again
Gas, two-way can switch under different unit operation operating modes；
In the process of running, turbine condenser high vacuum operation heat supply scheme：Open preposition vacuum extractor isolation stop valve
(110) preposition vacuum extractor (108), is opened, preposition vacuum extractor bypass stop valve (111) is closed, when condenser (105)
Near 2kPa of vacuum or so, suitably turn mesolow cylinder contact regulating butterfly valve (109) aperture down, increase the intermediate pressure cylinder steam discharge amount of drawing gas；
Two target patterns are determined in running, one is to determine that low pressure (LP) cylinder minimum through-current capacity, two are to improve condenser vacuum；
First, low pressure (LP) cylinder minimum through-current capacity is determined
When unit is in higher back pressure little volume flow, if saturation temperature of the low pressure (LP) cylinder exhaust temperature higher than exhaust steam pressure under corresponding
When spending, it is most likely that have occurred and that air blast phenomenon, at this moment to be intervened, in extraction condensing sets run, low pressure (LP) cylinder has one most
Little volume flow limits, and for 300MW level extraction and condensing unit back pressures in 4.9-6kPa or so, low pressure (LP) cylinder minimum mass flow is 120-
145t/h or so, if unit back pressuce is reduced into 1.5-2kPa, in the case where minimum volume flow restriction is constant, then low pressure (LP) cylinder
Minimum mass flow is 39-51t/h, you can arranges the amount of drawing gas in increase 81-94t/h；
2nd, condenser vacuum is improved
Before preposition vacuum extractor (108) is connected on into water ring vacuum pump in the system, preposition vacuum extractor isolation is set up
Stop valve (110), preposition vacuum extractor bypass stop valve (111), during into Heating Period, open preposition vacuum extractor isolation
Stop valve (110), preposition vacuum extractor (108) is opened, closing preposition vacuum extractor bypass stop valve (111) can improve
Unit condenser vacuum；
In system, the water ring vacuum pump (107) connected with preposition vacuum extractor (108) be unit original system water ring vacuum pump or
Person is the small water ring vacuum pump newly purchased, and small Water-ring vacuum pump power is less than raw water ring vacuum pump power, but is not less than raw water ring
The 1/3 of vacuum pump power.
2. according to the method for claim 1, wherein in system preposition vacuum extractor (108) be centrifugal vacuum pump or
It is steam jet ejector and Roots type vacuum pump.
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| CN107939463A (en) * | 2017-12-21 | 2018-04-20 | 天津国电津能热电有限公司 | A kind of condensing turbine group based on sorption type heat pump |
| CN108253812B (en) * | 2017-12-31 | 2020-03-03 | 东北电力大学 | Method for reducing temperature of circulating water in winter to improve vacuum of steam turbine condenser and cooler thereof |
| CN108180767B (en) * | 2018-02-24 | 2024-01-19 | 西安西热节能技术有限公司 | Plate type evaporative condenser applied to direct air cooling unit |
| CN109306877A (en) * | 2018-07-28 | 2019-02-05 | 西安西热节能技术有限公司 | It is a kind of to have the subsidiary engine system tune power source system for cutting cylinder functional bands heat supply |
| CN110821585A (en) * | 2019-11-27 | 2020-02-21 | 国电电力发展股份有限公司大连开发区热电厂 | Back-pressure heat supply technology-based condensation and extraction integrated system and application thereof |
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| CN113847825B (en) * | 2021-09-18 | 2024-03-12 | 西安热工研究院有限公司 | System and method for adjusting cooling water quantity of independent condenser of small induced draft fan turbine |
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