CN210921578U - Peak-shaving heat supply system combining electric heat storage and steam turbine waste heat recovery - Google Patents
Peak-shaving heat supply system combining electric heat storage and steam turbine waste heat recovery Download PDFInfo
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- CN210921578U CN210921578U CN201922165514.3U CN201922165514U CN210921578U CN 210921578 U CN210921578 U CN 210921578U CN 201922165514 U CN201922165514 U CN 201922165514U CN 210921578 U CN210921578 U CN 210921578U
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Abstract
The utility model discloses a peak shaving heat supply system combining electric heat storage and steam turbine waste heat recovery, which comprises a power distribution device, an electric heat storage device, a heat exchange device, a steam turbine waste heat recovery system and a heat supply network circulating water system; the power distribution device is electrically connected with the electric heat storage device and used for distributing surplus electric quantity to the electric heat storage device according to peak regulation requirements; the electric heat storage device is used for heating the refrigerant by utilizing surplus electric quantity and outputting a heat medium, a heat medium outlet of the electric heat storage device is communicated with a heat medium inlet of the heat exchange device, and a refrigerant inlet of the electric heat storage device is communicated with a refrigerant outlet of the heat exchange device; a heat supply network backwater outlet of the heat supply network circulating water system is communicated with a cooling water inlet of the steam turbine waste heat recovery system, and a cooling water outlet of the steam turbine waste heat recovery system is communicated with a heat exchange pipeline inlet of the heat exchange device through a pipeline with an electric adjusting valve; the outlet of the heat exchange pipeline of the heat exchange device is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system. The utility model discloses can effectively alleviate renewable energy and consume and accomodate the predicament.
Description
Technical Field
The utility model relates to a power plant's online electric quantity adjustment field, concretely relates to peak shaving heating system that electric heat accumulation and steam booster waste heat recovery combine.
Background
At present, follow the heating power of high-efficient performance power plant, generally set up exhaust steam waste heat recovery heating system in the power plant, combine various exhaust steam heating techniques, make full use of steam turbine exhaust steam latent heat heats the heat supply network water at the low temperature section, and the high temperature section is taken out the steam by the conventionality and is heated, forms the gradient utilization of the energy. The mode can effectively recover the power generation waste heat of the power plant, improve the primary energy utilization efficiency of the power plant, reduce the power generation coal consumption of the power plant and obviously improve the heat supply capacity and the economy. Meanwhile, the method conforms to the national industrial policy and the environmental protection requirement, and is an optimal environment-friendly and economic cogeneration scheme.
The exhaust steam of the steam turbine is condensed into water by an air cooling island or a condenser. Latent heat of vaporization carried by the exhaust steam is wasted, and the high-back-pressure heat supply transformation just reasonably utilizes the latent heat of vaporization to heat circulating water of a heat supply network, so that the purpose of waste heat utilization is achieved. At present, the domestic power plant high back pressure waste heat recovery technical route mainly comprises technologies such as a high back pressure heat supply network condenser, a steam booster and the like.
The high back pressure technology achieves the purpose of directly heating the return water of the heat supply network by utilizing the exhaust steam by improving the exhaust steam back pressure of the unit. At present, domestic high back pressure heat supply has two main implementation modes: one is a double-rotor mode; and the second mode is a low-pressure cylinder blade transformation mode.
The waste heat recovering technology for steam booster is based on the application of steam ejector principle in central heating industry. Initially the device was used only for vacuum extraction, and subsequently a series of applications based on the ejector principle were created: such as flash evaporation, refrigeration, vapor compression, and the like. At present, the technology is applied to the field of waste heat recovery of power plants.
The working principle of the steam turbine is shown in fig. 1, after high-parameter steam enters the steam turbine 100 from the port A, supersonic steam flow is generated through the nozzle, so that a negative pressure area is formed in a cavity around the nozzle, low-parameter steam is extracted from the port B and enters the steam turbine, and the steam of the two parameters is fully mixed in the steam turbine to form medium-parameter steam which is discharged through the port C.
At present, the heat supply network water inlet connects before the leading condenser of high back pressure, and the export connects to the female pipe of heat supply network water supply, then gets into the heat supply network circulating water volume reduction of the leading condenser of high back pressure, and the water yield reduction leads to the unable whole heat of exhaust steam to take away in the leading condenser.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a peak shaving heating system that electric heat accumulation and increase steam turbine waste heat recovery combine realizes that electric power production and heating power production assist the operation mutually, is showing the online peak shaving ability that promotes thermoelectric unit, both can effectively alleviate renewable energy and absorb the predicament, has wide market development space again.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a peak shaving heat supply system combining electric heat storage and steam turbine waste heat recovery comprises a power distribution device, an electric heat storage device, a heat exchange device, a steam turbine waste heat recovery system and a heat supply network circulating water system; the power distribution device is electrically connected with the electric heat storage device and used for distributing surplus electric quantity to the electric heat storage device according to peak regulation requirements; the electric heat storage device is used for heating a refrigerant by utilizing surplus electric quantity and outputting a heat medium, a heat medium outlet of the electric heat storage device is communicated with a heat medium inlet of the heat exchange device, and a refrigerant inlet of the electric heat storage device is communicated with a refrigerant outlet of the heat exchange device; a heat supply network backwater outlet of the heat supply network circulating water system is communicated with a cooling water inlet of the steam turbine waste heat recovery system, and a cooling water outlet of the steam turbine waste heat recovery system is communicated with a heat exchange pipeline inlet of the heat exchange device through a pipeline with an electric adjusting valve; and the outlet of the heat exchange pipeline of the heat exchange device is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system.
Further, the turbine heat recovery system comprises a pre-condenser, a turbine and a turbine condenser; the steam inlet of the pre-condenser and the low-parameter steam inlet of the steam booster are both communicated with an exhaust steam outlet of the thermal power generator set; the high-parameter steam inlet of the steam booster is communicated with a steam extraction outlet of the thermal power generator set, and the parameter steam outlet of the steam booster is communicated with a steam inlet of a steam booster condenser; the cooling water inlet of the pre-condenser is communicated with a heat supply network backwater outlet of a heat supply network circulating water system, and the cooling water outlet of the pre-condenser is communicated with a heat exchange pipeline inlet of the heat exchange device through a pipeline with an electric adjusting valve; and the cooling water outlet of the pre-condenser is also communicated with the cooling water inlet of the turbine condenser, and the cooling water outlet of the turbine condenser is communicated with the heat exchange pipeline inlet of the heat exchange device through another pipeline with an electric regulating valve.
Furthermore, the outlet of the heat exchange pipeline of the heat exchange device is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system through a water supply pump.
Furthermore, the outlet of the heat exchange pipeline of the heat exchange device is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system through a water supply pump.
The beneficial effects of the utility model reside in that:
the utility model discloses an electric heat accumulation equipment is central, constitutes a complete peak regulation heating system with original circuit, the heat supply network pipeline etc. of being qualified for the next round of competitions of heat supply power plant, realizes that electric power production and heat supply production assist the operation mutually, is showing the online peak regulation ability that promotes thermoelectric unit, both can effectively alleviate renewable energy and consume and receive the predicament, has wide market development space again.
1) On the basis of high back pressure transformation, the electric heat storage device can enable the power on the Internet to approach 0, basically realizes no load on the Internet during peak regulation, achieves the purpose of deep peak regulation, and gives up the space on the Internet for clean energy to the greatest extent.
2) The electric heat storage device can be used as an emergency standby heat source, and the reliability of heat supply is improved.
3) The internet surfing space is provided for new energy to the maximum extent, and the predicament of renewable energy consumption is effectively relieved.
Drawings
FIG. 1 is a schematic view of a conventional turbine booster;
fig. 2 is a schematic structural diagram of a system according to embodiment 1 of the present invention;
fig. 3 is a schematic general flow chart of embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the present embodiment.
Example 1
The embodiment aims to provide a peak shaving heat supply system combining electric heat storage and steam turbine waste heat recovery, and as shown in fig. 2, the peak shaving heat supply system comprises a power distribution device 1, an electric heat storage device 2, a heat exchange device 3, a steam turbine waste heat recovery system and a heat supply network circulating water system; the power distribution device 1 is electrically connected to the electric heat storage device 2 and used for distributing surplus electric quantity to the electric heat storage device 2 according to peak regulation requirements; the electric heat storage device 2 is used for heating a refrigerant by utilizing surplus electric quantity and outputting a heat medium, a heat medium outlet of the electric heat storage device is communicated with a heat medium inlet of the heat exchange device 3, and a refrigerant inlet of the electric heat storage device is communicated with a refrigerant outlet of the heat exchange device 3; a heat supply network backwater outlet of the heat supply network circulating water system is communicated with a cooling water inlet of the steam turbine waste heat recovery system, and a cooling water outlet of the steam turbine waste heat recovery system is communicated with a heat exchange pipeline inlet of the heat exchange device 3 through a pipeline with an electric adjusting valve; and the outlet of the heat exchange pipeline of the heat exchange device 3 is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system.
Further, the turbine heat recovery system comprises a pre-condenser 4, a turbine 5 and a turbine condenser 6; the steam inlet of the pre-condenser 4 and the low-parameter steam inlet of the steam booster 5 are both communicated with a waste steam outlet of the thermal power generator set; a high-parameter steam inlet of the steam booster 5 is communicated with a steam extraction outlet of the thermal power generating set, and a parameter steam outlet of the steam booster 5 is communicated with a steam inlet of the steam booster condenser 6; a cooling water inlet of the pre-condenser 4 is communicated with a heat supply network backwater outlet of a heat supply network circulating water system, and a cooling water outlet of the pre-condenser 4 is communicated with a heat exchange pipeline inlet of the heat exchange device 3 through a pipeline with an electric adjusting valve 7; and a cooling water outlet of the pre-condenser 4 is also communicated with a cooling water inlet of the turbine-increasing condenser 6, and the cooling water outlet of the turbine-increasing condenser 6 is communicated with a heat exchange pipeline inlet of the heat exchange device 3 through another pipeline with the electric regulating valve 8.
In the existing turbine heat recovery system, the cooling water outlet of the turbine condenser 6 is also communicated with the heat supply network water inlet of the heat supply network head station 104 of the heat supply network circulating water system, the steam inlet of the heat supply network head station 104 is communicated with the steam extraction outlet of the thermal power generator set, and the heat supply network water outlet of the heat supply network head station 104 is communicated with the heat supply network water supply main pipe of the heat supply network circulating water system.
Generally, the exhaust steam mainly comes from a condenser 101 of the thermal power generating unit, and the extracted steam comes from a turbine 102 of the thermal power generating unit.
In this embodiment, the outlet of the heat exchange pipeline of the heat exchange device 3 is communicated with a main heat supply network water supply pipe of the heat supply network circulating water system through a water supply pump 9.
In the present exemplary embodiment, the switchgear 1 is connected to a power plant booster station extension bay 103.
Example 2
This example provides a method for using the system described in example 1, as shown in fig. 3, including the following steps:
s1, dispatching a power grid to issue load demand data for the power plant;
s2, the peak regulation control platform receives the data and compares the real-time power generation load with the power grid demand load;
s3, when the power consumption is low, the peak regulation control platform controls the power distribution device to supply surplus power to the electric heat storage device, and the electric heat storage device heats a refrigerant (generally water) by using the surplus power to realize electric heat storage; the peak regulation control platform also controls the opening degree of the electric regulating valve to be reduced or closed;
when the peak-load control device is in a peak power consumption peak, the peak-load control platform controls the power distribution device to reduce or stop supplying power to the electric heat storage device and controls the opening of the electric adjusting valve to increase, the electric heat storage device outputs a heated heat medium to the heat exchange device, heat supply network water enters a heat exchange pipeline of the heat exchange device from a cooling water outlet of the steam booster waste heat recovery system and exchanges heat with the heat medium, and the heated heat supply network water is sent to a heat supply network water supply main pipe of a heat supply network circulating water system.
Through embodiment 1 system, can realize when the power consumption low ebb through the electric heat storage device heat accumulation to when the power consumption peak, thermal power generating set's electric load increases, utilize electric heat storage device as auxiliary heat source heating and output heat supply network water, reduce thermal power generating set's heat load, also can regard as emergent stand-by heat source.
Specifically, return water of a heat supply network of the heat supply network circulating water system enters a pre-condenser 4, after heat exchange is carried out between the heat supply network and exhaust steam in the pre-condenser 4, a part of heat supply network water is output to a steam booster condenser and exchanges heat with medium-parameter steam in the steam booster condenser, and the other part of heat supply network water is output to a heat exchange pipeline of a heat exchange device through a pipeline with an electric adjusting valve 7 to exchange heat with a heating medium and then is output to the heat supply network circulating water system through a water feed pump 9;
in the steam booster condenser, one part of heat supply network water exchanges heat with the parameter steam and is output to a heat supply network initial station 104 of a heat supply network circulating water system, and the other part of heat supply network water exchanges heat with a heating medium in a heat exchange pipeline of a heat exchange device through a pipeline of another electric adjusting valve 8 and is output to the heat supply network circulating water system through a water feeding pump 9.
The heat supply network water entering the heat supply network initial station 104 enters the heat supply network circulating water system after exchanging heat with the extracted steam.
Various corresponding changes and modifications can be made by those skilled in the art according to the above technical solutions and concepts, and all such changes and modifications should be included in the protection scope of the present invention.
Claims (4)
1. A peak shaving heat supply system combining electric heat storage and steam turbine waste heat recovery is characterized by comprising a power distribution device (1), an electric heat storage device (2), a heat exchange device (3), a steam turbine waste heat recovery system and a heat supply network circulating water system; the power distribution device (1) is electrically connected with the electric heat storage device (2) and used for distributing surplus electric quantity to the electric heat storage device (2) according to peak regulation requirements; the electric heat storage device (2) is used for heating a refrigerant by utilizing surplus electric quantity and outputting a heat medium, a heat medium outlet of the electric heat storage device is communicated with a heat medium inlet of the heat exchange device (3), and a refrigerant inlet of the electric heat storage device is communicated with a refrigerant outlet of the heat exchange device (3); a heat supply network backwater outlet of the heat supply network circulating water system is communicated with a cooling water inlet of the steam turbine waste heat recovery system, and a cooling water outlet of the steam turbine waste heat recovery system is communicated with a heat exchange pipeline inlet of the heat exchange device (3) through a pipeline with an electric adjusting valve; and the outlet of the heat exchange pipeline of the heat exchange device (3) is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system.
2. The peak shaving heating system combining electric heat storage and turbine increase waste heat recovery according to claim 1, characterized in that the turbine increase waste heat recovery system comprises a pre-condenser (4), a turbine increase (5), a turbine increase condenser (6); the steam inlet of the pre-condenser (4) and the low-parameter steam inlet of the steam booster (5) are both communicated with an exhaust steam outlet of the thermal power generating unit; a high-parameter steam inlet of the steam booster (5) is communicated with a steam extraction outlet of the thermal power generating set, and a parameter steam outlet of the steam booster (5) is communicated with a steam inlet of the steam booster condenser (6); a cooling water inlet of the pre-condenser (4) is communicated with a return water outlet of a heat supply network circulating water system, and a cooling water outlet of the pre-condenser (4) is communicated with a heat exchange pipeline inlet of the heat exchange device (3) through a pipeline with an electric adjusting valve (7); and a cooling water outlet of the pre-condenser (4) is also communicated with a cooling water inlet of the steam booster condenser (6), and a cooling water outlet of the steam booster condenser (6) is communicated with a heat exchange pipeline inlet of the heat exchange device (3) through another pipeline with an electric adjusting valve (8).
3. The peak shaving heating system combining the electric heat storage and the waste heat recovery of the steam turbine as claimed in claim 1, wherein the outlet of the heat exchange pipeline of the heat exchange device (3) is communicated with a main water supply pipe of a heat supply network of the heat supply network circulating water system through a water supply pump (9).
4. The peak shaving heating system combining the electric heat storage and the waste heat recovery of the steam turbine as claimed in claim 1, wherein the outlet of the heat exchange pipeline of the heat exchange device is communicated with a heat supply network water supply main pipe of the heat supply network circulating water system through a water supply pump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019214175480 | 2019-08-28 | ||
| CN201921417548 | 2019-08-28 |
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| CN210921578U true CN210921578U (en) | 2020-07-03 |
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| CN201922165514.3U Active CN210921578U (en) | 2019-08-28 | 2019-12-05 | Peak-shaving heat supply system combining electric heat storage and steam turbine waste heat recovery |
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| CN (1) | CN210921578U (en) |
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Address after: 100176 building 12, yard 18, Kechuang 13th Street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee after: HEPP Energy Environment Technology Co.,Ltd. Address before: 100176 building 12, yard 18, Kechuang 13th Street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Patentee before: Hep Energy and Environment Technology Co.,Ltd. |
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