CN109812866A - A kind of two-stage series exhaust steam residual heat recycling heating system - Google Patents
A kind of two-stage series exhaust steam residual heat recycling heating system Download PDFInfo
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- CN109812866A CN109812866A CN201910106445.0A CN201910106445A CN109812866A CN 109812866 A CN109812866 A CN 109812866A CN 201910106445 A CN201910106445 A CN 201910106445A CN 109812866 A CN109812866 A CN 109812866A
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Abstract
A kind of two-stage series exhaust steam residual heat recycling heating system, including steam turbine, level-one steam jet ejector, second steam injector, heat supply network heat exchanger, condenser；Extension steam exhaust is connected to the injection entrance of level-one steam jet ejector；Heat supply steam extraction outlet is connect with level-one steam jet ejector Working-fluid intaking among steam turbine；The steam drain of level-one steam jet ejector is connected with the injection entrance of second steam injector；Heat supply steam extraction outlet is also connect with second steam injector Working-fluid intaking among steam turbine；The steam drain of second steam injector is connected with heat exchangers for district heating shell-side；Primary net water return pipeline is heated by heat exchangers for district heating；Exhaust steam residual heat recycling energy-saving effect not only can be improved, while can greatly improve for thermal safety.
Description
Technical field
The invention belongs to exhaust steam of electric power plant waste heat recovering energy conserving fields, and in particular to a kind of two-stage series exhaust steam residual heat recycling
Heating system.
Background technique
Exhaust steam of electric power plant (i.e. turbine low pressure cylinder steam discharge) contains the very big latent heat of vaporization.Into the main steam of steam turbine,
Enthalpy is generally 3500kj/kg, its enthalpy of turbine low pressure cylinder steam discharge is generally 2400-2600kj/kg or so.
Exhaust steam of electric power plant is typically all to arrange Xiang great Qi, heat by cooling equipment (Air-Cooling Island, condenser, air cooling tower etc.) at this stage
Amount is wasted in vain, but also wants water consumption power consumption.The energy that power plant is lost by steam exhaust is exactly cold end loss.Power plant's hair
Electrical efficiency about 40%, loss about 60%, wherein cold end loss accounts for more than 50%.Therefore, exhaust steam of electric power plant waste heat is recycled, cold end is reduced
Loss is most potential one piece in power plant for energy conservation field.Recycle its exhaust steam residual heat to improve China's efficiency of energy utilization, subtract
Few environmental pollution is of great significance.
It recycles exhaust steam of electric power plant waste heat and reduces the technology and systems of cold end loss, since its energy-saving effect is significant, increasingly
Paid attention to.Steam power plant's exhaust steam residual heat is recycled, heat supply, the technological means for being exactly widely popularized and applying are used for.More than steam exhaust
In recuperation of heat heating system, generally step (multistage) heating system carries out Multi-stage heating to heat supply network return water.
Upgrading is carried out to low-grade steam exhaust using steam jet ejector technology and is used for heat supply, is that high efficiente callback utilizes more than steam exhaust
The effective means of heat.Steam jet ejector technology has the advantages that equipment is simple, reliable for operation, cost is relatively low.But it is constrained to steam
The performance of vapour injector, for running the lower unit of back pressure, the temperature for promoting hot net water using single-stage vapor injector is limited,
User's supply water temperature requirement can not directly be met.
This results in some problems: single-stage exhaust steam residual heat recycles heat supply, and steam exhaust yield is limited, more than entire steam power plant's steam exhaust
Hot energy-saving potential is not excavated all；Single-stage exhaust steam residual heat recycles heat supply, is not suitable for unit change working and is brought
Economy；Single-stage exhaust steam residual heat recycles heat supply, just in case breaking down, dead steam recovery system stops working.Steam exhaust cannot be by
Recycling, this not only influences energy-saving effect, but will influence to supply thermally safe.Just in case failure occurred in deep cooling season, it may appear that heating load is not
Foot, the temperature of resident's family do not reach requirement, and heat supply accident occur.
Summary of the invention
The purpose of the present invention is to provide a kind of two-stage series exhaust steam residual heats to recycle heating system, is being returned with meeting power plant
It receives in steam power plant's exhaust steam residual heat heating energy-saving transformation process, further increases for thermal safety, improves energy-saving effect.
To achieve the goals above, the technical scheme is that
A kind of two-stage series exhaust steam residual heat recycling heating system, including steam turbine, level-one steam jet ejector, second steam
Injector, heat supply network heat exchanger, condenser；It is characterized in that, the steam exhaust pipeline between last stage vane of steam turbine outlet and condenser
Upper setting pass-out steam pipeline, extension steam exhaust are connected to the injection entrance of level-one steam jet ejector；Heat supply among steam turbine
Steam extraction outlet is connect with level-one steam jet ejector Working-fluid intaking；The steam drain and second steam of level-one steam jet ejector spray
The injection entrance of device is connected；Heat supply steam extraction outlet is also connect with second steam injector Working-fluid intaking among steam turbine；Two
The steam drain of grade steam jet ejector is connected with heat exchangers for district heating shell-side；Primary net water return pipeline is added by heat exchangers for district heating
Heat.
System proposed by the present invention can effectively promote hot net water temperature rise, and then promote heating system overall efficiency.
(1) steam jet ejector device structure is simple, low in cost, reliable for operation；
(2) by two-stage steam jet ejector series connection recycling exhausted spare heat, system can be made to be suitable for low back pressure operating condition, and do not had to
Increase other equipment；
(3) by setting bypass, two-stage steam jet ejector can be made to be switched to single-stage, is suitable for the operating conditions such as high back pressure.
Detailed description of the invention
Fig. 1 is a kind of steam jet ejector schematic diagram；
Fig. 2 is a kind of two-stage series exhaust steam residual heat recycling system schematic diagram；
Steam turbine 1, generator 2, level-one steam jet ejector 3, second steam injector 4, steam exhaust control valve 5, level-one are dynamic
Power steam control valve door 6, steam discharge control valve 7, switching control valve 8, heat supply network heat exchanger 9, peak load calorifier 10, condenser
11, water circulating pump 12, second motive force steam control valve door 13
Specific embodiment
1,2 the invention will be further described with reference to the accompanying drawing, it should be understood that content described herein is only used for
The bright and explanation present invention, is not intended to limit the present invention.
Steam jet ejector be a kind of structure it is simple, without mechanical moving element, safe and reliable energy saver, be widely used in
Multiple fields.Fig. 1 gives the schematic illustration of steam jet ejector, introduces high steam as power from Working-fluid intaking and steams
Vapour forms high speed steam flow by nozzle expansion, and pressure reduction forms low-pressure area, passes through injection entrance draws low pressure steam to mixing
Chamber, reduction of speed, which boosts, after mixing to form middle pressure steam of the pressure between high steam and low-pressure steam and is discharged through steam drain,
Essence is the pressure that low-pressure steam is promoted using the kinetic energy of high steam.
As shown in Fig. 2, a kind of two-stage steam jet ejector recycling exhaust steam residual heat heating system is by steam turbine 1, generator 2, one
Grade steam jet ejector 3, second steam injector 4, valve 5, valve 6, valve 7, valve 8, heat supply network heat exchanger 9, peak load calorifier
10, the equipment such as condenser 11 and water circulating pump 12 form；
Pass-out steam pipeline is set on steam exhaust pipeline between the outlet of 1 exhaust stage blade of steam turbine and condenser 11, for drawing
Part steam exhaust is connected to the injection entrance of level-one steam jet ejector 3 out；1 intermediate heat supply steam extraction outlet of steam turbine and level-one steam spray
The connection of 3 Working-fluid intaking of emitter；The steam drain of level-one steam jet ejector 3 is connected with the injection entrance of second steam injector 4；
The intermediate heat supply steam extraction of steam turbine 1 outlet is also connect with 4 Working-fluid intaking of second steam injector；Second steam injector 4
Steam drain is connected with 9 shell-side of heat exchangers for district heating；1 intermediate heat supply steam extraction outlet of steam turbine is connected with 10 shell-side of peak load calorifier；
Steam exhaust control valve 5 is installed on the steam exhaust injection pipeline of level-one steam jet ejector 3, level-one steam jet ejector 3 enters
Power steam control valve 6 is installed, 3 steam drain of level-one steam jet ejector installs steam discharge control valve 7 before mouthful.In addition, in steam exhaust
Setting switching bypasses and is connected to the injection entrance of second steam injector 4 on injection pipeline, installs and cuts in switching bypass
Change control valve 8；
Step (multistage) heating system is constituted by heat exchangers for district heating 9 and peak load calorifier 10, heat supply network return water is carried out multistage
Heating.Heat exchangers for district heating 9 is connected with peak load calorifier 10, and primary net return water passes sequentially through heat exchangers for district heating 9, peak load calorifier 10
It is heated, and exports primary net and supply water.
The condensate system of the condensed water of heat exchangers for district heating 9 and peak load calorifier 10 access power plant carries out water recycling.Spike
Hydrophobic 9 shell-side of inflow heat exchangers for district heating of heater 10；The condensed water of 9 shell-side outlet of heat supply network heat exchanger with not by the steamer of injection
1 steam exhaust of machine passes through formed condensed water after condenser 11, and two strands of condensed waters enter the condensation return water system of power plant after converging.
Under normal conditions, fired power generating unit back pressure is lower, causes the taste of steam exhaust lower, can not directly utilize.Steam injection
Device exhaust steam residual heat upgrading heat supply process utilizes the steamer of steam turbine heat supply steam extraction injection low pressure by introducing steam jet ejector equipment
Machine steam exhaust enters back into heat supply network heat exchanger and heats to primary net return water after forming mixed vapour, to realize to more than steam exhaust
The effective use of heat.
For the unit back pressuce of 5~15kPa or so, primary net return water directly can not be heated with exhaust steam residual heat；While in view of
Heat supply network return water temperature directly can not be heated to heat user needs by the outlet vapor of the heating ability of injector, single-stage injector
Temperature, therefore the heating process for being considered as gradually by water temperature heating to required temperature, entirely once netting is divided into heat exchangers for district heating
It is heated with 2 grades of peak load calorifier, and the heat source of heat exchangers for district heating is to be formed by elevated pressures after two-stage steam jet ejector is connected
Steam.
Specific work process is as follows: exhaust steam in steam turbine waste heat for supplying system is sprayed by steam turbine 1, generator 2, level-one steam
Device 3, second steam injector 4, valve 5, valve 6, valve 7, valve 8, heat supply network heat exchanger 9, peak load calorifier 10, condenser 11
It is formed with equipment such as water circulating pumps 12.1 exhaust stage blade of steam turbine outlet condenser 11 between setting steam exhaust injection pipeline with
The injection entrance of level-one steam jet ejector 3 is connected to；The working fluid of steam turbine 1 intermediate extraction outlet and level-one steam jet ejector 3
Entrance connection.The work of injector is utilized after heat supply steam extraction passes through 3 acceleration and pressure decrease of level-one steam jet ejector as working steam
Steam turbine low-temp low-pressure steam exhaust is drawn into the mixing chamber of injector by characteristic, and two strands of steam are quickly completing heat and mass exchange
Afterwards, uniform mixed vapour is formed.Mixed vapour is sent to second level steaming after diffuser deceleration is compressed to certain back pressure
The injection entrance of vapour injector 4.Meanwhile working fluid of another burst of heat supply steam extraction as second injector 4, it is used for injection first
Stock mixed vapour.Second steam injector 4 exports mixed vapour and is sent to heat supply network heat exchanger 9 for heating heat supply network primary water.
Primary net return water passes sequentially through heat exchangers for district heating 9, peak load calorifier 10 carries out second level heating；And the hydrophobic stream of peak load calorifier 10
Enter 9 shell-side of heat exchangers for district heating.Condensed water is not formed by condenser by the exhaust steam in steam turbine of injection, and is exported with heat exchangers for district heating
Condensed water converge after enter power plant condensation return water system.
In order to realize system above in the wide load of unit, wide range of environmental conditions Nei Zhuo efficient operation, the injection of level-one steam
Steam exhaust control valve 5 is installed, installation power steam is adjusted before 3 entrance of level-one steam jet ejector on the steam exhaust injection pipeline of device 3
Valve 6,3 steam drain of level-one steam jet ejector install steam discharge control valve 7,3 operating condition of level-one steam jet ejector can be adjusted.
In addition, setting switching bypasses and is connected to the injection entrance of second steam injector 4 on steam exhaust injection pipeline, by the switching
Road installation switches control valve 8, installs power steam control valve 13 before the entrance of second steam injector 4.
In the low back pressure operating condition of unit, two-stage steam jet ejector is run simultaneously, is adjusted level-one steam using valve 5,6,7 and is sprayed
3 operating condition of emitter adjusts 4 operating condition of second steam injector using valve 8, valve 13, realizes the tandem working of two-stage steam jet ejector,
Exhaust steam in steam turbine is aspirated simultaneously and carries out upgrading pressurization, is aspirated maximum using steam amount.In the unit when back pressure operating condition, two-stage is steamed
Vapour injector is run simultaneously, adjusts 3 operating condition of level-one steam jet ejector using valve 5,6,7, valve 8 closes cutting suction steam turbine
Steam exhaust is realized and carries out double stage tandem upgrading pressurization after exhaust steam in steam turbine is aspirated in the tandem working of two-stage steam jet ejector, single-stage, taken out
It inhales medium using steam amount.In unit high back pressure operating condition, valve 5,6,7 is closed, level-one steam jet ejector 3 is closed and works, valve
Door 8 opens suction exhaust steam in steam turbine, adjusts 4 operating condition of second steam injector using valve 8, valve 13, single-stage aspirates steam turbine
Upgrading pressurization is carried out after steam exhaust, is aspirated minimum using steam amount.
Two-stage steam jet ejector is mutually spare, realizes work switching, can be improved for thermally safe, avoid heat supply accident.When one
When grade 3 failure of steam jet ejector, valve 5,6,7 is closed, level-one steam jet ejector 3 is closed and works, utilize second steam injector 4
It works independently, ensures heat supply running.When second steam 4 failure of injector, valve 8 and valve 13, second steam injection are closed
Device 4 does not work, and injection entrance accesses 3 steam discharge of level-one steam jet ejector, only uses as steam passage, is sprayed using level-one steam
Emitter 3 works independently, and ensures heat supply running.
In addition, different intermediate extraction outlets can be used in two-stage steam jet ejector steam turbine, and peak load calorifier can also be adopted
It is exported with different intermediate extractions.
Finally, it should be noted that being not intended to restrict the invention the foregoing is merely explanation of the invention, although to this hair
It is bright to be described in detail, it for those skilled in the art, still can be to aforementioned documented technical solution
It modifies or equivalent replacement of some of the technical features.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc. should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of two-stage series exhaust steam residual heat recycles heating system, including the spray of steam turbine, level-one steam jet ejector, second steam
Emitter, heat supply network heat exchanger, condenser；It is characterized in that, last stage vane of steam turbine exports on the steam exhaust pipeline between condenser
Pass-out steam pipeline is set, and extension steam exhaust is connected to the injection entrance of level-one steam jet ejector；Heat supply is taken out among steam turbine
Vapor outlet is connect with level-one steam jet ejector Working-fluid intaking；The steam drain and second steam injector of level-one steam jet ejector
Injection entrance be connected；Heat supply steam extraction outlet is also connect with second steam injector Working-fluid intaking among steam turbine；Second level
The steam drain of steam jet ejector is connected with heat exchangers for district heating shell-side；Primary net water return pipeline is heated by heat exchangers for district heating.
2. a kind of two-stage series exhaust steam residual heat according to claim 1 recycles heating system, which is characterized in that further include
Peak load calorifier；Heat exchangers for district heating is connected with peak load calorifier, constitutes step heating system, carries out multistage add to heat supply network return water
Heat；Primary net water return pipeline passes sequentially through heat exchangers for district heating, peak load calorifier is heated, and exports primary net and supply water.
3. a kind of two-stage series exhaust steam residual heat according to claim 2 recycles heating system, which is characterized in that steam turbine
Intermediate heat supply steam extraction outlet is connected with peak load calorifier shell-side.
4. a kind of two-stage series exhaust steam residual heat according to claim 3 recycles heating system, which is characterized in that two-stage is steamed
Different intermediate extraction outlets can be used in vapour injector, and different intermediate extraction outlets can also be used in peak load calorifier.
5. a kind of two-stage series exhaust steam residual heat according to claim 2 recycles heating system, which is characterized in that heat supply network adds
The condensate system that the condensed water of hot device and peak load calorifier accesses power plant carries out water recycling；The hydrophobic inflow heat of peak load calorifier
Net heater shell-side；The condensed water of heat supply network heat exchanger shell-side outlet with institute's shape after condenser is not passed through by the exhaust steam in steam turbine of injection
At condensed water, two strands of condensed waters enter the condensation return water system of power plant after converging.
6. a kind of two-stage series exhaust steam residual heat according to claim 1 recycles heating system, which is characterized in that level-one is steamed
Steam exhaust control valve is installed on the steam exhaust injection pipeline of vapour injector, installs one before level-one steam jet ejector Working-fluid intaking
Grade power steam control valve, level-one steam jet ejector steam drain install steam discharge control valve；It is arranged on steam exhaust injection pipeline
Switching bypasses and is connected to the injection entrance of second steam injector, the installation switching control valve in switching bypass.
7. a kind of two-stage series exhaust steam residual heat according to claim 6 recycles heating system, which is characterized in that second level is steamed
Second motive force steam control valve door is installed before vapour injector Working-fluid intaking.
8. a kind of two-stage series exhaust steam residual heat according to claim 7 recycles heating system, which is characterized in that
In the low back pressure operating condition of unit, two-stage steam jet ejector is run simultaneously, realizes the tandem working of two-stage steam jet ejector, simultaneously
It aspirates exhaust steam in steam turbine and carries out upgrading pressurization, aspirate maximum using steam amount；In the unit when back pressure operating condition, the spray of two-stage steam
Emitter is run simultaneously, is realized the tandem working of two-stage steam jet ejector, is carried out two-stage series connection upgrading after a level suction exhaust steam in steam turbine
Pressurization is aspirated medium using steam amount；In unit high back pressure operating condition, upgrading increasing is only carried out after two level suction exhaust steam in steam turbine
Pressure is aspirated minimum using steam amount.
9. a kind of two-stage series exhaust steam residual heat according to claim 8 recycles heating system, which is characterized in that
In the low back pressure operating condition of unit, adjusted using first order kinetics steam control valve door, steam exhaust control valve, steam discharge control valve
Level-one steam jet ejector operating condition adjusts second steam injector work using second motive force steam control valve door, switching control valve
Condition；In the unit when back pressure operating condition, adjusted using first order kinetics steam control valve door, steam exhaust control valve, steam discharge control valve
Level-one steam jet ejector operating condition, switching control valve close two level suction exhaust steam in steam turbine of cutting；In unit high back pressure operating condition,
First order kinetics steam control valve door, steam exhaust control valve, steam discharge control valve are closed, the work of level-one steam jet ejector is closed, cuts
It changes control valve and opens two level suction exhaust steam in steam turbine, adjust two using second motive force steam control valve door, switching control valve
Grade steam jet ejector operating condition.
10. a kind of two-stage series exhaust steam residual heat according to claim 7 recycles heating system, which is characterized in that
Two-stage steam jet ejector is mutually spare, realizes work switching；When level-one steam jet ejector failure, closes first order kinetics and steam
Steam control valve door, steam exhaust control valve, steam discharge control valve are closed the work of level-one steam jet ejector, are sprayed using second steam
Device works independently, and ensures heat supply running；When second steam injector failure, second motive force steam control valve door, switching are closed
Control valve, second steam injector do not work, and injection entrance accesses level-one steam jet ejector steam discharge, are only used as steam passage
It uses, is worked independently using level-one steam jet ejector, ensure heat supply running.
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| CN2018113045649 | 2018-11-04 | ||
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Cited By (5)
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| CN110847976A (en) * | 2019-11-13 | 2020-02-28 | 西安交通大学 | Water-electricity cogeneration system for wide-load operation of power plant and operation method |
| CN112050274A (en) * | 2020-08-26 | 2020-12-08 | 普瑞森能源科技（北京）股份有限公司 | Cascade energy utilization heating system under low-load working condition and control method thereof |
| CN113375210A (en) * | 2021-06-28 | 2021-09-10 | 大唐环境产业集团股份有限公司 | Cold end waste heat supply method and system of coupling absorption heat pump |
| CN113464225A (en) * | 2021-07-05 | 2021-10-01 | 西安交通大学 | System and method for wide load operation of power plant with two-stage steam ejector |
| CN114440289A (en) * | 2021-12-28 | 2022-05-06 | 华电电力科学研究院有限公司 | Pipe network heat storage system based on heat supply network bypass injection pressure reduction and regulation and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113375210A (en) * | 2021-06-28 | 2021-09-10 | 大唐环境产业集团股份有限公司 | Cold end waste heat supply method and system of coupling absorption heat pump |
| CN113375210B (en) * | 2021-06-28 | 2022-03-01 | 大唐环境产业集团股份有限公司 | Cold end waste heat supply method and system of coupling absorption heat pump |
| CN113464225A (en) * | 2021-07-05 | 2021-10-01 | 西安交通大学 | System and method for wide load operation of power plant with two-stage steam ejector |
| CN114440289A (en) * | 2021-12-28 | 2022-05-06 | 华电电力科学研究院有限公司 | Pipe network heat storage system based on heat supply network bypass injection pressure reduction and regulation and control method thereof |
| CN114440289B (en) * | 2021-12-28 | 2022-11-01 | 华电电力科学研究院有限公司 | Pipe network heat storage system based on heat supply network bypass injection pressure reduction and regulation and control method thereof |
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| CN109812866B (en) | 2020-04-28 |
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Address after: 100097 Floor 1-12, 120 Zizhuyuan Road, Haidian District, Beijing Applicant after: Datang (Beijing) Energy Management Co., Ltd. Applicant after: DATANG ENVIRONMENT INDUSTRY GROUP CO., LTD. Applicant after: China Datang Group Co., Ltd. Address before: 100097 Floor 1-12, 120 Zizhuyuan Road, Haidian District, Beijing Applicant before: Datang (Beijing) Energy Management Co., Ltd. Applicant before: DATANG ENVIRONMENT INDUSTRY GROUP CO., LTD. Applicant before: China Datang Power Group Corporation |
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