CN110726168A - Steam turbine waste heat maximize utilization system of steam power plant - Google Patents
Steam turbine waste heat maximize utilization system of steam power plant Download PDFInfo
- Publication number
- CN110726168A CN110726168A CN201910895998.9A CN201910895998A CN110726168A CN 110726168 A CN110726168 A CN 110726168A CN 201910895998 A CN201910895998 A CN 201910895998A CN 110726168 A CN110726168 A CN 110726168A
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- supply network
- pressure cylinder
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- 239000002918 waste heat Substances 0.000 title claims abstract description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 76
- 238000001816 cooling Methods 0.000 claims description 23
- 239000000498 cooling water Substances 0.000 claims description 13
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000003303 reheating Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 6
- 238000011084 recovery Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010908 plant waste Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
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Classifications
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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
- F24D3/18—Hot-water central heating systems using heat pumps
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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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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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
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
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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
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
-
- 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
- F24D2200/00—Heat sources or energy sources
- F24D2200/16—Waste heat
Abstract
The invention relates to a steam turbine waste heat maximum utilization system of a thermal power plant, which comprises a first heat supply unit, a second heat supply unit, a heat supply network heater and a heat supply network water return pipeline, wherein the first heat supply unit is connected with the second heat supply unit through a pipeline; the first heat supply unit comprises a first unit intermediate pressure cylinder, the second heat supply unit comprises a heat pump and a second unit intermediate pressure cylinder, a heat supply network water return pipeline is connected with the heat supply network heater through the heat pump, and a first heat supply network water return valve and a second heat supply network water return valve are respectively arranged on the heat supply network heater inlet and the heat pump inlet of the heat supply network water return pipeline; the first unit intermediate pressure cylinder is connected with the heat supply network heater through a first heat supply pipeline valve; the second unit intermediate pressure cylinder is connected with the heat supply network heater through a second heat supply pipeline valve; and the second unit intermediate pressure cylinder is connected with the heat pump through a third heat supply pipeline valve. The invention can recover the waste heat of the steam turbines of the two units to the maximum extent while meeting the requirements of heat supply safety, power load scheduling and heat supply network transmission capacity, thereby achieving the purpose of recovering the waste heat of a heat supply power plant to the maximum extent.
Description
Technical Field
The invention relates to the technical field of waste heat recovery of thermal power plants, in particular to a system for maximally utilizing waste heat of a steam turbine of a thermal power plant.
Background
Under the great trend of energy conservation and emission reduction, waste heat recovery of waste steam of a heat supply unit of a thermal power plant is imperative, waste steam waste heat projects of the power plant are more and more, but the waste heat of the typically configured thermal power plant is completely recovered, and the typically configured heat supply plant can only recover the waste heat of one unit at present due to the limitation requirements on heat supply safety, the requirement on power load scheduling and the limitation of heat network transmission capacity and system, so that waste heat utilization is caused. Meanwhile, no guiding document aiming at the waste steam and waste heat recovery project of the power plant exists in the industry until now.
In view of the above problems, this innovative design steam turbine waste heat maximum utilization system of steam power plant can effectually retrieve the steam turbine waste heat of two units when satisfying heat supply safety, power load scheduling requirement and heat supply network transmission capacity to reach the purpose of the nearly zero release of steam power plant waste heat.
Disclosure of Invention
The invention aims to provide a system for maximally utilizing the waste heat of a steam turbine of a thermal power plant, which can be used for maximally recovering the waste heat of the steam turbines of two units while meeting the requirements of heat supply safety, power load scheduling and heat supply network transmission capacity, thereby achieving the aim of maximally recovering the waste heat of the thermal power plant.
The invention provides a thermal power plant steam turbine waste heat maximum utilization system, which comprises a first heat supply unit, a second heat supply unit, a heat supply network heater and a heat supply network water return pipeline, wherein the first heat supply unit is connected with the second heat supply unit through a pipeline;
the first heat supply unit is a double-rotor double-backpressure optical axis type backpressure heat supply unit or a backpressure heat supply unit, and the second heat supply unit is an absorption heat pump heat supply unit or a compression heat pump heat supply unit;
the first heat supply unit comprises a first unit intermediate pressure cylinder, and the second heat supply unit comprises a heat pump and a second unit intermediate pressure cylinder;
the heat supply network backwater pipeline is connected with the heat supply network heater through the heat pump and used for heating the backwater of the heat supply network through the heat pump;
the heat supply network water return pipeline is provided with a first heat supply network water return valve and a second heat supply network water return valve at the positions of the heat supply network heater inlet and the heat pump inlet respectively;
the first set of intermediate pressure cylinders are connected with the heat supply network heater through a first heat supply pipeline valve and used for reheating return water of the heat supply network through steam exhaust of the first set of intermediate pressure cylinders;
the second unit intermediate pressure cylinder is connected with the heat supply network heater through a second heat supply pipeline valve and used for reheating return water of the heat supply network through steam exhaust of the second unit intermediate pressure cylinder;
and the second unit intermediate pressure cylinder is connected with the heat pump through a third heat supply pipeline valve and used for heating the return water of the heat supply network through the steam exhaust of the second unit intermediate pressure cylinder.
Further, the heat pump is an absorption heat pump or a compression heat pump.
Furthermore, the birotor double-backpressure optical axis type backpressure heat supply unit is a water cooling unit or an air cooling unit, and the air cooling unit is a direct air cooling unit or an indirect air cooling unit.
Furthermore, the first heat supply unit also comprises a first unit condenser, a first unit low-pressure cylinder, a first unit circulating water pump, a first unit cooling water tower and a first unit medium-pressure cylinder steam exhaust butterfly valve; the first set of intermediate pressure cylinders are connected with the first set of low pressure cylinders through the first set of intermediate pressure cylinder steam exhaust butterfly valve; the first unit low-pressure cylinder is connected with the first unit condenser through an exhaust pipe; the first unit condenser is connected with the first unit cooling water tower through a first unit circulating water pipeline; the first unit circulating water pipeline is provided with the first unit circulating water pump; the heat supply network heater is provided with a drain valve of the heat supply network heater.
Furthermore, the second heat supply unit also comprises a second unit low-pressure cylinder, a second unit condenser, a second unit circulating water pump, a second unit cooling water tower and a second unit medium-pressure cylinder steam exhaust butterfly valve; the second set middle pressure cylinder is connected with the second set low pressure cylinder through the second set middle pressure cylinder steam exhaust butterfly valve; the second unit low-pressure cylinder is connected with the second unit condenser through an exhaust pipe; the second unit condenser is connected with the second unit cooling water tower through a second unit circulating water pipeline; and the second unit circulating water pipeline is provided with the second unit circulating water pump.
Further, the heat pump is connected with the second unit cooling tower through a boosting pipeline, and the boosting pipeline is provided with a circulating water boosting pump and used for discharging surplus heat to the second unit cooling tower through the circulating water boosting pump.
Furthermore, a low-temperature heat source inlet of the heat pump is connected with a water outlet of the second unit condenser, and a low-temperature heat source outlet of the heat pump is connected with a water return port of the second unit condenser.
By means of the scheme, the steam turbine waste heat maximum utilization system of the thermal power plant can meet the requirements of heat supply safety, power load scheduling and heat supply network transmission capacity, meanwhile, the steam turbine waste heat of the two units can be recovered to the maximum extent, and the purpose of recovering the waste heat of the thermal power plant to the maximum extent is achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a system for maximizing the utilization of waste heat of a steam turbine of a thermal power plant.
Reference numbers in the figures:
1-a machine set intermediate pressure cylinder; 2-a machine set low pressure cylinder; 3-a unit condenser; 4-a heat supply network heater; 5-a unit circulating water pump; 6-a unit cooling tower; 7-a first heat supply pipeline valve; 8-a machine set middle pressure cylinder steam exhaust butterfly valve; 9-a first heat supply network water return valve; 10-heat supply network heater drain valve; 11-second machine set middle pressure cylinder; 12-second machine set low pressure cylinder; 13-a second unit condenser; 14-a heat pump; 15-a second unit circulating water pump; 16-second unit cooling tower; 17-a second heat supply pipeline valve; 18-second machine set middle pressure cylinder steam exhaust butterfly valve; 19-a second heat supply network water return valve; 20-circulating water booster pump; 21-third heat supply pipeline valve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a system for maximizing waste heat utilization of a steam turbine of a thermal power plant, which includes a first heat supply unit, a second heat supply unit, a heat supply network heater 4 and a heat supply network water return pipeline;
the first heat supply unit is a double-rotor double-backpressure optical axis type backpressure heat supply unit or a backpressure heat supply unit, and the second heat supply unit is an absorption heat pump heat supply unit or a compression heat pump heat supply unit;
the first heat supply unit comprises a first unit intermediate pressure cylinder 1, the second heat supply unit comprises a heat pump 14 and a second unit intermediate pressure cylinder 11, a heat supply network water return pipeline is connected with the heat supply network heater 4 through the heat pump 14 and used for heating heat supply network water return through the heat pump 14, and a first heat supply network water return valve 9 and a second heat supply network water return valve 19 are respectively arranged at the inlet of the heat supply network heater 4 and the inlet of the heat pump 14 on the heat supply network water return pipeline; the first set of intermediate pressure cylinders 1 (steam extraction pipes connected to the steam exhaust pipes of the intermediate pressure cylinders) are connected with the heat supply network heater 4 through the first heat supply pipeline valves 7 and used for reheating the return water of the heat supply network through the steam exhaust of the first set of intermediate pressure cylinders 1;
the second unit intermediate pressure cylinder 11 is connected with the heat supply network heater 4 through a second heat supply pipeline valve 17 and used for reheating the heat supply network backwater through steam exhausted by the second unit intermediate pressure cylinder 11; the second unit intermediate pressure cylinder 11 is connected with the heat pump 14 through a third heat supply pipeline valve 21 and used for heating the return water of the heat supply network (for one time) through the steam exhaust of the second unit intermediate pressure cylinder 11.
Through this steam turbine waste heat maximize utilization system of steam power plant, satisfying heat supply safety, power load scheduling requirement and heat supply network transmission capacity, can effectual recovery two units (in other examples, also can be many units) the steam turbine waste heat to reach the purpose of the nearly zero release of steam power plant waste heat.
In this embodiment, the heat pump 14 may be an absorption heat pump or a compression heat pump.
In this embodiment, the dual-rotor dual-backpressure optical axis type backpressure heat supply unit may be a water cooling unit or an air cooling unit, and the air cooling unit may be a direct air cooling unit or an indirect air cooling unit.
In this embodiment, the first heat supply unit further includes a first unit condenser 3, a first unit low pressure cylinder 2, a first unit circulating water pump 5, a first unit cooling water tower 6, and a first unit medium pressure cylinder steam exhaust butterfly valve 8; the first set of middle pressure cylinders 1 are connected with the first set of low pressure cylinders 2 through a set of middle pressure cylinder steam exhaust butterfly valve 8, and the first set of low pressure cylinders 2 are connected with the first set of condenser 3 through an exhaust pipe; the first unit condenser 3 is connected with the first unit cooling water tower 6 through a first unit circulating water pipeline; the first unit circulating water pipeline is provided with a first unit circulating water pump 5; the network heater 4 is provided with a network heater trap 10.
In this embodiment, the second heat supply unit further includes a second unit low pressure cylinder 12, a second unit condenser 13, a second unit circulating water pump 15, a second unit cooling water tower 16, and a second unit medium pressure cylinder steam exhaust butterfly valve 18; the second set middle pressure cylinder 11 is connected with the second set low pressure cylinder 12 through a second set middle pressure cylinder steam exhaust butterfly valve 18; the second unit low pressure cylinder 12 is connected with the second unit condenser 13 through an exhaust pipe; the second unit condenser 13 is connected with a second unit cooling water tower 16 through a second unit circulating water pipeline; and a second unit circulating water pump 15 is arranged on the second unit circulating water pipeline.
In this embodiment, the heat pump 14 is connected to the second unit cooling tower 16 through a pressure-increasing pipeline, and the pressure-increasing pipeline is provided with a circulating water pressure-increasing pump 20, so as to discharge excess heat to the second unit cooling tower 16 through the circulating water pressure-increasing pump 20.
In this embodiment, the low-temperature heat source inlet of the heat pump 14 is connected to the water outlet of the second-unit condenser 13, the low-temperature heat source outlet of the heat pump 14 is connected to the water return port of the second-unit condenser 13, and the condensate outlet of the heat pump 14 is discharged to the steam side of the condenser.
Through the thermal power plant steam turbine waste heat maximum utilization system, the return water of the heat supply network is primarily heated to 70-85 ℃ from 45-55 ℃ through the heat pump 14 of the second unit, then the extracted steam from the first unit and the second unit is respectively adjusted and controlled through the first heat supply pipeline valve 7 and the second heat supply pipeline valve 17 to heat and control the return water of the heat supply network heater 4, so that the requirement of the heat supply temperature of 90-130 ℃ is met. The heat supply load distribution of the two units can be realized by the first heat supply pipeline valve 7 and the second heat supply pipeline valve 17 respectively.
In the initial and final period of heat supply and when the heat load is lower, in order to meet the power generation requirement of the power grid, the return water of the heat supply network passes through the circulating water booster pump 20 of the first unit, and redundant heat is discharged to the cooling water tower 16 of the second unit.
In the heat supply peak period, the adjustment and the economic operation of the heat supply load can be realized by adjusting the first heat supply pipeline valve 7 and the second heat supply pipeline valve 17, and at the moment, the heat pump 14 carries the basic heat supply load, so that the maximization and the economic operation of the heat supply of the thermal power plant are realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. A thermal power plant steam turbine waste heat maximum utilization system is characterized by comprising a first heat supply unit, a second heat supply unit, a heat supply network heater and a heat supply network water return pipeline;
the first heat supply unit is a double-rotor double-backpressure optical axis type backpressure heat supply unit or a backpressure heat supply unit, and the second heat supply unit is an absorption heat pump heat supply unit or a compression heat pump heat supply unit;
the first heat supply unit comprises a first unit intermediate pressure cylinder, and the second heat supply unit comprises a heat pump and a second unit intermediate pressure cylinder;
the heat supply network backwater pipeline is connected with the heat supply network heater through the heat pump and used for heating the backwater of the heat supply network through the heat pump;
the heat supply network water return pipeline is provided with a first heat supply network water return valve and a second heat supply network water return valve at the positions of the heat supply network heater inlet and the heat pump inlet respectively;
the first set of intermediate pressure cylinders are connected with the heat supply network heater through a first heat supply pipeline valve and used for reheating return water of the heat supply network through steam exhaust of the first set of intermediate pressure cylinders;
the second unit intermediate pressure cylinder is connected with the heat supply network heater through a second heat supply pipeline valve and used for reheating return water of the heat supply network through steam exhaust of the second unit intermediate pressure cylinder;
and the second unit intermediate pressure cylinder is connected with the heat pump through a third heat supply pipeline valve and used for heating the return water of the heat supply network through the steam exhaust of the second unit intermediate pressure cylinder.
2. The system for maximum utilization of the waste heat of the steam turbine of the thermal power plant according to claim 1, wherein the heat pump is an absorption heat pump or a compression heat pump.
3. The thermal power plant steam turbine waste heat maximum utilization system of claim 1, wherein the birotor double-backpressure optical axis type backpressure heat supply unit is a water cooling unit or an air cooling unit, and the air cooling unit is a direct air cooling unit or an indirect air cooling unit.
4. The system for maximizing the utilization of the waste heat of the steam turbine of the thermal power plant as claimed in claim 1, wherein the first heat supply unit further comprises a first unit condenser, a first unit low-pressure cylinder, a first unit circulating water pump, a first unit cooling water tower and a first unit medium-pressure cylinder steam exhaust butterfly valve; the first set of intermediate pressure cylinders are connected with the first set of low pressure cylinders through the first set of intermediate pressure cylinder steam exhaust butterfly valve; the first unit low-pressure cylinder is connected with the first unit condenser through an exhaust pipe; the first unit condenser is connected with the first unit cooling water tower through a first unit circulating water pipeline; the first unit circulating water pipeline is provided with the first unit circulating water pump; the heat supply network heater is provided with a drain valve of the heat supply network heater.
5. The system for maximum utilization of the waste heat of the steam turbine of the thermal power plant according to claim 4, wherein the second heat supply unit further comprises a second unit low-pressure cylinder, a second unit condenser, a second unit circulating water pump, a second unit cooling water tower and a second unit medium-pressure cylinder steam exhaust butterfly valve; the second set middle pressure cylinder is connected with the second set low pressure cylinder through the second set middle pressure cylinder steam exhaust butterfly valve; the second unit low-pressure cylinder is connected with the second unit condenser through an exhaust pipe; the second unit condenser is connected with the second unit cooling water tower through a second unit circulating water pipeline; and the second unit circulating water pipeline is provided with the second unit circulating water pump.
6. The system of claim 5, wherein the heat pump is connected to the second cooling tower through a pressure-increasing pipeline, and the pressure-increasing pipeline is provided with a circulating water pressure-increasing pump for returning the heat supply network water to the second cooling tower through the circulating water pressure-increasing pump.
7. The thermal power plant steam turbine waste heat maximum utilization system of claim 6, wherein a low-temperature heat source inlet of the heat pump is connected with a water outlet of the second unit condenser, and a low-temperature heat source outlet of the heat pump is connected with a water return port of the second unit condenser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895998.9A CN110726168A (en) | 2019-09-22 | 2019-09-22 | Steam turbine waste heat maximize utilization system of steam power plant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910895998.9A CN110726168A (en) | 2019-09-22 | 2019-09-22 | Steam turbine waste heat maximize utilization system of steam power plant |
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| CN201910895998.9A Pending CN110726168A (en) | 2019-09-22 | 2019-09-22 | Steam turbine waste heat maximize utilization system of steam power plant |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112489843A (en) * | 2020-11-02 | 2021-03-12 | 中广核工程有限公司 | Nuclear power plant waste heat utilization system and nuclear power plant waste heat utilization method |
| CN113587185A (en) * | 2021-07-01 | 2021-11-02 | 国核电力规划设计研究院有限公司 | Heat supply system of nuclear power unit and control method of heat supply system |
| CN114110714A (en) * | 2021-11-29 | 2022-03-01 | 西安西热节能技术有限公司 | Low-pressure cylinder low-flow working condition waste heat deep recovery heat supply system and application method thereof |
-
2019
- 2019-09-22 CN CN201910895998.9A patent/CN110726168A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112489843A (en) * | 2020-11-02 | 2021-03-12 | 中广核工程有限公司 | Nuclear power plant waste heat utilization system and nuclear power plant waste heat utilization method |
| CN113587185A (en) * | 2021-07-01 | 2021-11-02 | 国核电力规划设计研究院有限公司 | Heat supply system of nuclear power unit and control method of heat supply system |
| CN114110714A (en) * | 2021-11-29 | 2022-03-01 | 西安西热节能技术有限公司 | Low-pressure cylinder low-flow working condition waste heat deep recovery heat supply system and application method thereof |
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