CN207004585U - A kind of thermal power plant's cold end saves therrmodynamic system - Google Patents
A kind of thermal power plant's cold end saves therrmodynamic system Download PDFInfo
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Abstract
A kind of thermal power plant's cold end saves therrmodynamic system, including main steam turbine, steam exhaust device, Air-Cooling Island, small turbine vapour source system, exhaust steam recycling system, joint water conservancy project system；Joint water conservancy project system includes small turbine condenser, exhaust steam condenser；Small steam turbine exhaust steam connects small turbine condenser；Small turbine vapour source system is connected between steam turbine high-pressure cylinder, intermediate pressure cylinder and small turbine；Exhaust steam recycling system is connected between Steam Turbine Through IP Admission, low pressure (LP) cylinder and exhaust steam condenser；By small turbine condenser, the heated type condenser in exhaust steam recycling, summer undertakes the spike condenser of peakload, and circulation, effectively integrates and configures so that whole therrmodynamic system parameter matching is most reasonable, and the method for operation is optimal.
Description
Technical field
The utility model belongs to power plant for energy conservation field, and in particular to a kind of thermal power plant's cold end saves therrmodynamic system.
Background technology
Thermal power plant, electrically driven feed pump, air blower, or other equipment are changed to small turbine dragging, and abbreviation electricity changes vapour, saves
Can significant effect.The vapour source that electricity changes vapour carrys out arrogant extracted steam from turbine.Frequently encountered in practice：Parameter of drawing gas (pressure and temp) accords with
Close small turbine requirement, but steam flow deficiency；Or steam flow is enough, but steam parameter (pressure and temp) is inadequate.Therefore,
Solves the problems, such as the key factor that vapour source just implements " electricity changes vapour " into puzzlement.
On the other hand, the cold end loss in thermal power plant, more than the 50% of whole power plant's energy loss is accounted for.The numerous and confused pin of power plant
To " reduction cold end loss " this energy-saving potential technology, high efficiente callback utilizes Direct Air-Cooled, indirect air cooling or water cooling Steam Turbine
Exhaust steam heat energy, be exactly a very effective energy saving means.
Recycled for Steam Turbine exhaust steam, be generally to be used for Winter heat supply, therefore, also needed in therrmodynamic system
The heated type condenser of some sets is set.Had a great influence furthermore, it is contemplated that Air-cooled Unit is contributed by summer temperature, heated type
Condenser can also design the summer peakload for being used as sharing cold end in summer.
How will：1st, solves the problems, such as vapour source；2nd, exhaust steam recycles；3rd, summer shares peakload；4th, Winter heat supply, this
Four aspects, effectively configuration integrate, and realize that electricity changes vapour and can smoothly implemented, exhaust steam is recovered efficient utilization, energy-saving benefit
Maximize, meanwhile, in whole therrmodynamic system, parameter matching is most reasonable, and the method for operation is optimal, multiple functional complete, operation dimension
Shield is simple, and cost of investment is few, safe and reliable to operation.This is the problems for needing to solve in power plant for energy conservation.
Utility model content
The purpose of this utility model is to provide a kind of thermal power plant's cold end energy-conservation therrmodynamic system, suitable for carrying out power plant for energy conservation
Transformation.Realize dragging feed pump (or air blower, or other equipment) small turbine condenser and Air-cooled Unit summer spike condensing
Device, winter exhaust steam heating condenser and heat exchangers for district heating cooperation.
A kind of thermal power plant's cold end saves therrmodynamic system, including main steam turbine, steam exhaust device, Air-Cooling Island, small turbine vapour source
System, exhaust steam recycling system, joint water conservancy project system；Main steam turbine low pressure (LP) cylinder steam discharge connects Air-Cooling Island by steam exhaust device,
Air-Cooling Island condensate line connects the hot well of steam exhaust device；It is characterized in that：Joint water conservancy project system include small turbine condenser,
Exhaust steam condenser；Small steam turbine exhaust steam connects small turbine condenser, small turbine condenser condensed water pipeline connection steam discharge dress
The hot well put；Small turbine vapour source system is connected between steam turbine high-pressure cylinder, intermediate pressure cylinder and small turbine；Exhaust steam recycles
System is connected between Steam Turbine Through IP Admission, low pressure (LP) cylinder and exhaust steam condenser；Exhaust steam condensate line connects the heat of steam exhaust device
Well.
Further, joint water conservancy project system also includes heat exchangers for district heating, heat supply network water system；The heat supply network circulation of heat supply network water system
Water lines pass through exhaust steam condenser, small turbine condenser and heat exchangers for district heating successively；Heat supply network recirculation return pipe connects exhaust steam condensing
The inlet pipeline of device water side, the water side inlet pipeline of the outlet pipeline connection small turbine condenser of exhaust steam condenser water side are small
The water side outlet pipeline of turbine condenser is by connecting heat supply network recycling outlet after heat exchangers for district heating.
Further, small turbine vapour source system sets first to increase steam turbine, and high pressure cylinder steam discharge connecting line to first increases vapour
The power steam entrance of machine, intermediate pressure cylinder steam discharge connecting line to first increase the suction steam ports of steam turbine, and the first steam discharge for increasing steam turbine connects
Road is taken over to small turbine.
Further, exhaust steam recycling system sets second to increase steam turbine, and intermediate pressure cylinder steam discharge connecting line to second increases vapour
The power steam entrance of machine, low pressure (LP) cylinder steam discharge connecting line to second increase the suction steam ports of steam turbine, and the second steam discharge for increasing steam turbine connects
Road is taken over to exhaust steam condenser.
Further, exhaust steam condenser, the water side output pipe of small turbine condenser and intake line are connected with bypass,
By bypassing the cold tower of connection machine, access heat supply network recirculated water or the cold tower cooler water of machine are realized by Valve controlling.
Further, the suction steam ports pipeline of the second increasing steam turbine is provided with control valve, and control valve is at stage 2/3/4
Open；The power steam entrance pipe of second increasing steam turbine is provided with control valve, and control valve is opened at stage 3/4；Stage 2
The cold phase of end at the beginning of referring to spike season summer and winter, stage 3 refer to winter time cold season, and the stage 4 refers to deep cooling season in winter.
Further, heat exchangers for district heating vapour side entrance pipeline is provided with control valve, and control valve is opened at stage 4,
Stage 4 refers to deep cooling season in winter；Oxygen-eliminating device is sent into by connecting line after steam condensation in heat exchangers for district heating.
Pass through above-mentioned technical proposal, realize small turbine condenser, the heated type condenser in exhaust steam recycling,
Summer undertakes the spike condenser of peakload, and heat supply network circulation, effectively integrates and configures so that whole
In therrmodynamic system, parameter matching is most reasonable, and the method for operation is optimal, and Function is complete complete, and Operation and Maintenance is simple, small investment,
Securely and reliably.
Brief description of the drawings
Fig. 1 is thermal power plant's cold end energy-conservation therrmodynamic system schematic diagram；
Wherein 1 high pressure cylinder, 2 intermediate pressure cylinders, 3 low pressure (LP) cylinders, 4 steam exhaust devices, 5 hot wells, 6 vapour sources increase steam turbine, and 7 small turbines, 8 remove
Oxygen device, 9 Air-Cooling Islands, 10 exhaust steam increasing steam turbine, 11 small machine condensers, 12 exhaust steam condensers, 13 heat exchangers for district heatings, 14 heat supply networks recycle
Water pipe, the cold tower of 15 machines, 16 heat supply network recirculation return pipes, 17-23 control valves.
Embodiment
1 pair of the utility model is further described below in conjunction with the accompanying drawings, it will be appreciated that content described herein is only used for
Description and interpretation the utility model, it is not used to limit the utility model.
Embodiment one：
Fig. 1 is thermal power plant's cold end energy-conservation therrmodynamic system configuration schematic diagram of specific embodiment one.Power plant's installation is separate unit
Electric pump is changed heat pump by 300MW level Direct Air-cooled Units, single unit, and the exhaust steam of single steam turbine is utilized.This technology is equally suitable
For：More direct (or indirect) connects Air-cooled Unit and water chiller, and more unit electric pumps change heat pump, multiple steam turbines group
The situation that exhaust steam is utilized simultaneously.
The utility model thermal power plant cold end energy-conservation therrmodynamic system, including steam turbine, steam exhaust device, Air-Cooling Island, small turbine
Vapour source system, exhaust steam recycling system, joint water conservancy project system.
Turbine low pressure cylinder steam discharge enters steam exhaust device, and steam exhaust device bottom sets hot well；Steam exhaust device is connected by pipeline
Air-Cooling Island is connect, the exhaust steam of steam exhaust device outflow enters after Air-Cooling Island condenses flows back to steam exhaust device hot well by connecting line；
Wherein, small turbine vapour source system is connected between steam turbine high-pressure cylinder, intermediate pressure cylinder and small turbine.Small turbine
Vapour source system sets first to increase steam turbine (vapour source increasing steam turbine), and cold section of connecting line of the reheated device of high pressure cylinder steam discharge to first increases steam turbine
Power steam entrance, intermediate pressure cylinder steam discharge connecting line to first increase steam turbine suction steam ports, first increase steam turbine steam discharge connection
Pipeline is to feed pump turbine (small turbine)；Small steam turbine exhaust steam pipeline connects small turbine condenser, passes through company after condensation
Steam exhaust device hot well is flowed back on adapter road.More increasing steam turbines can be set in first increasing steam turbine, to adapt to various operating conditions, improve operation
Flexibility；
Exhaust steam recycling system is connected between Steam Turbine Through IP Admission, low pressure (LP) cylinder and exhaust steam condenser.Exhaust steam recovery profit
Second is set to increase steam turbine with system, intermediate pressure cylinder steam discharge connecting line to second increases the power steam entrance of steam turbine, low pressure (LP) cylinder steam discharge
For connecting line to the second suction steam ports for increasing steam turbine, the second steam discharge connecting line to exhaust steam condenser, second for increasing steam turbine increases vapour
The steam drain of machine, into the vapour side of exhaust steam condenser, steam exhaust device heat is flowed back to after condensation by pipeline connection by connecting line
Well；
The suction steam ports pipeline of second increasing steam turbine is provided with control valve 17, and control valve 17 is at the operating mode stage 2/3/4
Open；The working steam entrance pipe of second increasing steam turbine is provided with control valve 18, and control valve 18 is opened at stage/3/4.
The cold phase of end at the beginning of the operating mode stage 2 refers to spike season summer and winter, operating mode stage 3 refer to winter time cold season, and the operating mode stage 4 refers to winter deep cooling
Season.
Joint water conservancy project system includes small machine condenser (small turbine condenser), exhaust steam condenser, the cold tower of machine, heat supply network heating
Device, recirculating cooling water system, heat supply network water system, supporting piping (including pipeline, valve, pipe fitting, suspension and support, expansion joint etc.).
Steam Turbine Through IP Admission exhaust line connects heat exchangers for district heating, and heat exchangers for district heating vapour side entrance pipeline is provided with control valve
Door 19, control valve 19 is opened at the operating mode stage 4, and the operating mode stage 4 refers to deep cooling season in winter.In heat exchangers for district heating after steam condensation
Oxygen-eliminating device is sent into by connecting line.
The heat supply network circulating water line of heat supply network water system is successively by exhaust steam condenser, small turbine condenser and heat supply network heating
Device, heat supply network recirculated water supply water to heat supply network after heating.Heat supply network recirculation return pipe connects the input (water inlet) of exhaust steam condenser water side
Pipeline, water side water inlet (input) pipeline of water outlet (output) pipeline connection small turbine condenser of exhaust steam condenser water side are small
Water side water outlet (output) pipeline of turbine condenser is by connecting heat supply network recycling outlet after heat exchangers for district heating；
Exhaust steam condenser, water side water outlet (output) pipeline of small turbine condenser and water inlet (input) pipeline are connected with side
Road, by bypassing the cold tower of connection machine, realize that Heating Period accesses heat supply network recirculated water by control valve 20-23 controls, in non-heating
Phase accesses the cold tower cooler water of machine；Control valve 20,23 is opened in Heating Period, and non-heating period is closed；Control valve 21,22 is in heating
Phase is closed, and non-heating period is opened.
Cooling device of the small turbine condenser as small turbine, for cooling down small steam turbine exhaust steam, vacuum is established, tieed up
Hold vacuum.Meanwhile utilizing small steam turbine exhaust steam heating heat supply network backwater in Heating Period so that small turbine cold end loss is zero, with
Improve the heat utilization efficiency of unit.
Small turbine design back-pressure is 17KPa--45KPa, i.e. summer 17KPa back pressure operations, and winter 45KPa high back pressure is transported
OK.Spring and summer autumn, the cooling water of small turbine condenser come from the cold tower of machine, for cooling down small steam turbine exhaust steam, establish vacuum, dimension
Hold vacuum.During winter operation, the cooling water of small turbine condenser is heat supply network recirculated water, is also used for cooling down small steam turbine exhaust steam,
Vacuum is established, maintains vacuum.Meanwhile winter utilizes small steam turbine exhaust steam heating heat supply network backwater so that small turbine cold end loss
It is zero, to improve the heat utilization efficiency of unit.
Exhaust steam condenser, as spike condenser during summer, for sharing the load of big steam turbine；Winter is as heated type
Condenser, heat supply network circulating backwater is heated using the big exhaust steam in steam turbine after steam turbine boosting heats up is increased.
Spring and summer autumn, exhaust steam condenser come from the cold tower of machine as spike condenser, cooling water.
During winter operation, big turbine back pressure is set as that 22.5KPa is run.(back pressure is set as 22.5KPa, is only
Narration is convenient and illustrated example.The configuration mode of other specification is also in the application protection domain).During winter operation, exhaust steam
For condenser as heated type condenser, recirculated water is heat supply network recirculated water.
The system method of operation is as follows：
By the use of steam turbine high-pressure cylinder steam discharge as first increase steam turbine power steam, aspirate Steam Turbine Through IP Admission steam discharge, first
Increase small turbine vapour source of the steam turbine steam discharge as " electric pump changes heat pump "；
Increase steam turbine power steam by the use of Steam Turbine Through IP Admission steam discharge as second, suction turbine low pressure cylinder steam discharge is (weary
Vapour), second increases steam turbine steam discharge as heat supply network backwater one-level heating source；
Small steam turbine exhaust steam pipeline connects small turbine condenser shell (vapour) side, and the cold tower cooler water lines of machine connect small steamer
Machine condenser tube (water) side, meanwhile, the water inlet pipe side of small turbine condenser is also connected with exhaust steam condenser rising pipe side.
Second increases turbine exhaust steam duct road connection exhaust steam condenser, heat supply network water return pipeline (or the cold tower cooler water lines of machine) connection
Exhaust steam condenser tube (water) side；
During summer operation, the cooling water of small turbine condenser is the cold tower cooler water of machine；Exhaust steam condenser undertakes air cooler
During the condenser effect of group spike, the cold tower cooler water of machine also serves as the recirculated water of exhaust steam condenser；
During winter operation, the cold tower of machine does not put into operation, after heat supply network backwater first passes through exhaust steam condenser progress first order heat temperature raising,
Second of the heating of small turbine condenser is entered back into, heat exchangers for district heating third time is entered back into and heats up, be sent to outside networks of heat supply.
The cold tower cooler water of machine can realize switching with heat supply network backwater；
Small machine condenser coagulates and the hydrophobic hot well for being connected to steam exhaust device of exhaust steam condenser condensed water.
Small turbine design back-pressure is 17KPa--45KPa, i.e. summer 17KPa back pressure operations, and winter 45KPa high back pressure is transported
OK.
Spring and summer autumn, the cooling water of small turbine condenser come from the cold tower of machine, for cooling down small steam turbine exhaust steam, establish true
Sky, maintain vacuum.
During winter operation, the recirculated water of small turbine condenser is heat supply network recirculated water.For cooling down small steam turbine exhaust steam, build
Vertical vacuum, maintains vacuum.Meanwhile heating heat supply network backwater using small steam turbine exhaust steam so that small turbine cold end loss is zero, with
Improve the heat utilization efficiency of unit.
During winter operation, big turbine back pressure is set as that 22.5KPa is run.
Water conservancy project system is respectively partly run as follows：
First, Steam Side of Condenser operation：
For small turbine condenser：In each operating condition, small steam turbine exhaust steam all accesses small turbine condenser vapour
Side, the condensate of small turbine condenser access big steam turbine hot well (or small turbine condenser can carry water-carriage system).
For exhaust steam condenser：Running status is divided into four operating mode stages according to big system of reclaiming exhaust steam in steam turbine：Summer
Spike season, the cold phase of end at the beginning of winter, winter time cold season, and deep cooling season in winter.End at the beginning of the operating mode stage 2 refers to spike season summer and winter is cold
Phase, operating mode stage 3 refer to winter time cold season, and the operating mode stage 4 refers to deep cooling season in winter.
Spike season summer：The second upper control valve of suction steam ports bypass for increasing steam turbine is opened, and the second power for increasing steam turbine steams
Valve is closed on vapour entrance pipe, and valve is closed on the pipeline of heat exchangers for district heating vapour side entrance；During summer operation, exhaust steam condenser is
Spike condenser acts on, and shares part cooling task for big machine Air-Cooling Island, to improve big machine cooling effect, reduces big machine back pressure,
Efficiency is improved, improves and contributes.Carry out the part exhaust steam of arrogant steam turbine, through piping, steam pressure is not adjusted, and access exhaust steam is coagulated
Vapour device vapour side, the condensate of exhaust steam condenser access big steam turbine hot well (or exhaust steam condenser carries water-carriage system).
The cold phase of end at the beginning of winter：Second, which increases control valve on the power steam pipeline of steam turbine, closes；Now, increase steam turbine power to steam
Vapour system is not run.A small amount of exhaust steam gravity flow enters exhaust steam condenser.
Secondary cold season and deep cooling season in winter in the winter time：Exhaust steam condenser is the effect of heated type condenser, and the second increasing steam turbine is taken out
Inhale the upper control valve of steam ports bypass to open, valve opening on power steam entrance pipe, heat supply network backwater heated using big machine exhaust steam,
To reduce big machine cold end loss, big machine entirety heat utilization efficiency is improved.Carry out the part exhaust steam of arrogant steam turbine, increase steam turbine by second
After boosting heating, exhaust steam Steam Side of Condenser is accessed, the condensate of exhaust steam condenser accesses big steam turbine hot well (or exhaust steam condensing
Device carries water-carriage system).
Second, the operation of condenser water side：
Small turbine condenser and exhaust steam condenser concatenation：It is divided into two operating conditions：Spring and summer autumn (non-heating period), winter
Season (Heating Period).
Spring and summer autumn：The water at low temperature that the cold tower of slave comes, into exhaust steam condenser and small turbine condenser, heat exchange heating
Afterwards, into the cold tower radiating and cooling of machine, exhaust steam condenser and small turbine condenser are then entered back into, circulation is formed, goes round and begins again.
Winter：The cooling water of the cold tower of machine switches to heat supply network recirculated water, is changed by exhaust steam condenser and small turbine condenser
After heat heating, the heat exchangers for district heating of initial station is sent to.
3rd, heat exchangers for district heating operation：
For heat exchangers for district heating：In deep cooling season in the winter time, control valve is at stage 4 on the pipeline of heat exchangers for district heating vapour side entrance
Open.Heat exchangers for district heating carries out third time heating to heat supply network recirculated water, after heating, is sent into municipal heating network.Heat exchangers for district heating
Oxygen-eliminating device is sent into by connecting line after middle steam condensation.
Embodiment two：
Power plant's installation is two 300MW level Direct Air-cooled Units, and two unit electric pumps change heat pump, the exhaust steam of two steam turbines
It is utilized.
Technical scheme as described by implementing one.When Liang Tai (and more) electro-mechanical pump changes heat pump and exhaust steam utilizes, can incite somebody to action
Each self-corresponding energy-conservation therrmodynamic system is arranged to unit style, i.e., the energy-conservation therrmodynamic system of each big steam turbine is separate unit,
Mutual independent operating.It can equally be well applied to：More direct (or indirect) connects Air-cooled Unit and water chiller, more unit electricity
Pump changes heat pump, the exhaust steam of multiple steam turbines group while situation about being utilized.
Finally it should be noted that：Explanation of the present utility model is the foregoing is only, is not limited to the utility model, to the greatest extent
The utility model is described in detail pipe, and for those skilled in the art, it can still be remembered to foregoing
The technical scheme of load is modified, or carries out equivalent substitution to which part technical characteristic.It is all in spirit of the present utility model
Within principle, any modification, equivalent substitution and improvements made etc., it should be included within the scope of protection of the utility model.
Claims (7)
1. a kind of thermal power plant's cold end saves therrmodynamic system, including main steam turbine, steam exhaust device, Air-Cooling Island, small turbine vapour source system
System, exhaust steam recycling system, joint water conservancy project system；Main steam turbine low pressure (LP) cylinder steam discharge connects Air-Cooling Island by steam exhaust device, empty
Cool island condensate line connects the hot well of steam exhaust device；It is characterized in that：Joint water conservancy project system includes small turbine condenser, weary
Vapour condenser；Small steam turbine exhaust steam connects small turbine condenser, small turbine condenser condensed water pipeline connection steam exhaust device
Hot well；Small turbine vapour source system is connected between steam turbine high-pressure cylinder, intermediate pressure cylinder and small turbine；Exhaust steam recycles system
System is connected between Steam Turbine Through IP Admission, low pressure (LP) cylinder and exhaust steam condenser；Exhaust steam condensate line connects the hot well of steam exhaust device.
2. thermal power plant's cold end according to claim 1 saves therrmodynamic system, it is characterised in that joint water conservancy project system also includes
Heat exchangers for district heating, heat supply network water system；The heat supply network circulating water line of heat supply network water system coagulates by exhaust steam condenser, small turbine successively
Vapour device and heat exchangers for district heating；Heat supply network recirculation return pipe connects the inlet pipeline of exhaust steam condenser water side, and exhaust steam condenser water side goes out
Water lines connect the water side inlet pipeline of small turbine condenser, and the water side outlet pipeline of small turbine condenser is added by heat supply network
Heat supply network recycling outlet is connected after hot device.
3. thermal power plant's cold end according to claim 1 saves therrmodynamic system, it is characterised in that small turbine vapour source system is set
The first increasing steam turbine is put, high pressure cylinder steam discharge connecting line to first increases the power steam entrance of steam turbine, intermediate pressure cylinder steam discharge connecting line
The suction steam ports for increasing steam turbine to first, first increases the steam discharge connecting line of steam turbine to small turbine.
4. thermal power plant's cold end according to claim 1 saves therrmodynamic system, it is characterised in that exhaust steam recycling system is set
The second increasing steam turbine is put, intermediate pressure cylinder steam discharge connecting line to second increases the power steam entrance of steam turbine, low pressure (LP) cylinder steam discharge connecting line
The suction steam ports for increasing steam turbine to second, second increases the steam discharge connecting line of steam turbine to exhaust steam condenser.
5. thermal power plant's cold end according to claim 1 saves therrmodynamic system, it is characterised in that exhaust steam condenser, small steamer
The water side output pipe and intake line of machine condenser are connected with bypass, real by Valve controlling by bypassing the cold tower of connection machine
Now access heat supply network recirculated water or the cold tower cooler water of machine.
6. thermal power plant's cold end according to claim 4 saves therrmodynamic system, it is characterised in that second increases the suction vapour of steam turbine
Mouth pipeline is provided with control valve, and control valve is opened at stage 2/3/4；Second increases on the power steam entrance pipe of steam turbine
Provided with control valve, control valve is opened at stage 3/4；The cold phase of end at the beginning of stage 2 refers to spike season summer and winter, stage 3 refer to
Winter time cold season, stage 4 refer to deep cooling season in winter.
7. thermal power plant's cold end according to claim 2 saves therrmodynamic system, it is characterised in that heat exchangers for district heating vapour side entrance
Pipeline is provided with control valve, and control valve is opened at stage 4, and the stage 4 refers to deep cooling season in winter；Steam coagulates in heat exchangers for district heating
Oxygen-eliminating device is sent into by connecting line after knot.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218091A (en) * | 2017-06-14 | 2017-09-29 | 联合瑞升（北京）科技有限公司 | A kind of thermal power plant's cold end energy-conservation therrmodynamic system and operation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218091A (en) * | 2017-06-14 | 2017-09-29 | 联合瑞升（北京）科技有限公司 | A kind of thermal power plant's cold end energy-conservation therrmodynamic system and operation method |
| CN107218091B (en) * | 2017-06-14 | 2018-08-07 | 联合瑞升（北京）科技有限公司 | A kind of energy saving therrmodynamic system of thermal power plant's cold end and operation method |
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