CN214007248U - Thermoelectric decoupling system of thermal power generating unit - Google Patents
Thermoelectric decoupling system of thermal power generating unit Download PDFInfo
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- CN214007248U CN214007248U CN202023251832.0U CN202023251832U CN214007248U CN 214007248 U CN214007248 U CN 214007248U CN 202023251832 U CN202023251832 U CN 202023251832U CN 214007248 U CN214007248 U CN 214007248U
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Abstract
The utility model discloses a thermal power generating unit thermoelectric decoupling system, which comprises a steam turbine, a generator, a steam exhaust heat exchanger, a compression heat pump, a heat supply network heat exchanger and an electric boiler; the steam exhaust end of the steam turbine is connected with the inlet of the steam exhaust heat exchanger; the exhaust steam heat exchanger is connected with the heat absorption end of the compression heat pump; the heat release end of the compression heat pump is connected with the heat supply network heat exchanger; the output shaft of the steam turbine is connected with the driving shaft of the generator, and the output end of the generator is respectively connected with the compression heat pump, the electric boiler and the power grid. The utility model discloses an electric drive compression heat pump that the unit produced absorbs used heat from the steam turbine exhaust to the return water of heating heat supply pipe network is heated, thereby realizes the purpose of external heat supply. The system can realize the complete decoupling of the heat and the electricity of the coal-fired thermal power generating unit, simultaneously fully utilizes the waste heat of the steam exhaust of the steam turbine, and greatly improves the integral energy utilization efficiency.
Description
Technical Field
The utility model relates to a combined heat and power generation technical field especially relates to a thermoelectricity decoupling zero system of thermal power generating unit.
Background
In recent years, renewable energy is rapidly developed in China, and the proportion of electricity generated by the renewable energy is increased year by year. However, the volatility of renewable energy sources, particularly wind and solar power, makes their consumption by the power grid more difficult. In order to meet the scheduling requirement of a power grid on large-scale access of renewable energy, a thermal power technology is needed to further improve the flexible operation capacity of the unit. Aiming at a coal-fired cogeneration unit, the heat and power decoupling capacity of the unit needs to be increased so as to meet the requirements on heat energy and electric energy in different environments.
The pure condensing generator set in the coal-fired thermal power generating unit does not have the capacity of external heat supply, although a high-pressure steam bypass can be adopted in engineering and is directly used for heat supply through temperature reduction and pressure reduction of high-pressure steam, the pure condensing generator set belongs to typical 'high-grade low-use' and has poor heat economy; in addition, an electric boiler can be added for supplying heat to the outside, but high-grade electric energy is also used for supplying heat, and the utilization efficiency of energy is low. In an area needing simultaneous electric energy and heat energy supply, thermoelectric decoupling is a core problem all the time, if a unit cannot flexibly adjust thermoelectric ratio, the unit has important influence on normal operation and economic operation of the unit, most of the existing coal-fired thermal power units can only adjust thermoelectric supply to a certain extent, and most of the units cannot completely realize thermoelectric decoupling.
The coal-fired thermal power straight condensing unit can only produce electric power energy, does not have the ability of direct external heat supply, although the straight condensing unit can realize partial heat supply through high-pressure bypass transformation, to the direct temperature reduction decompression heat supply mode of high-grade steam, its energy utilization efficiency is very low.
In summary, some technologies are already applied to the existing coal-fired unit in the aspect of improving flexibility, but the high efficiency of the system cannot be considered, and the energy utilization rate of the system is low under the general condition. Therefore, how to further realize the thermoelectric decoupling of the coal-fired thermal power generating unit, improve the operation flexibility of the unit and ensure the utilization efficiency of energy sources has profound significance in the aspects of realizing the consumption of renewable energy power generation by the coal-fired thermal power generating unit, solving the problems of energy sources and environment and the like under the energy background that China is suitable for the large-proportion access of renewable energy sources.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects, the utility model provides a thermoelectric decoupling system of a thermal power generating unit, which is connected with the inlet of a steam exhaust heat exchanger through the steam exhaust end of a steam turbine, the outlet of the steam exhaust heat exchanger is connected with a condenser, the condenser is connected with a hot well, and the bottom of the hot well is connected with a condensate pump; the heat absorption end of the compression heat pump is connected with the exhaust heat exchanger, and the heat release end of the compression heat pump is connected with the heat supply network heat exchanger; the output shaft of the steam turbine is connected with the driving shaft of the generator, and the output end of the generator is respectively connected with the compression heat pump, the electric boiler and the power grid. The utility model discloses can realize thermal power generating unit's thermoelectric decoupling zero, satisfy the demand to heat energy and electric energy under the various condition.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a thermal power generating unit thermoelectric decoupling system comprises a steam turbine, a generator, a steam exhaust heat exchanger, a compression heat pump, a heat supply network heat exchanger and an electric boiler; the steam exhaust end of the steam turbine is connected with the inlet of the steam exhaust heat exchanger; the exhaust steam heat exchanger is connected with the heat absorption end of the compression heat pump; the heat release end of the compression heat pump is connected with the heat supply network heat exchanger; the output shaft of the steam turbine is connected with the driving shaft of the generator, and the output end of the generator is respectively connected with the compression heat pump, the electric boiler and the power grid.
Furthermore, a power supply interface of the compression heat pump is connected with the output end of the generator and a power grid.
Furthermore, a power supply interface of the electric boiler is connected with the output end of the generator and a power grid.
Furthermore, the outlet of the exhaust steam heat exchanger is connected with a condenser, the condenser is connected with a hot well, and the bottom of the hot well is connected with a condensate pump.
Furthermore, the thermoelectric decoupling system further comprises a heat storage tank, an inlet of the heat storage tank is communicated with a steam outlet of the electric boiler, and an outlet of the heat storage tank is communicated with the steam pipeline.
The utility model has the advantages that:
because the exhaust steam of the steam turbine contains a large amount of waste heat which cannot be directly utilized, the waste heat is generally directly diffused into the air through the cooling tower, but the waste heat can be used for providing a heat source of the compression type heat pump. The utility model discloses an electric drive compression heat pump that the unit produced absorbs used heat from the steam turbine exhaust to the return water of heating heat supply pipe network is heated, thereby realizes the purpose of external heat supply.
In addition, the energy efficiency ratio (COP) of the compression heat pump is generally more than 3, and the better heating capacity can be realized by consuming less electric energy, so that the utilization efficiency of high-grade energy is greatly improved. Meanwhile, the system is also provided with an electric boiler and a heat storage tank for absorbing electric power from the power grid to supply heat to the outside, and storing certain heat in the heat storage tank to meet the rapid increase of the external heat supply demand.
The utility model relates to a thermoelectric decoupling zero system of thermal power generating unit not only can realize the thermoelectric complete decoupling zero of coal-fired thermal power generating unit, make full use of the used heat of steam turbine exhaust simultaneously, increased substantially holistic energy utilization efficiency.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1 is a steam turbine; 2 is a generator; 3 is a steam exhaust heat exchanger; 4 is a compression heat pump; 5 is a heat supply network heat exchanger; 6 is a condenser; 7 is a hot well; 8 is a condensate pump; 9 is an electric boiler; 10 is a heat storage tank.
Detailed Description
For a better understanding of the present invention, embodiments of the present invention will be explained in detail below with reference to the accompanying drawings.
Example (b): as shown in fig. 1, a thermal power generating unit thermoelectric decoupling system includes: the system comprises a steam turbine 1, a generator 2, an exhaust steam heat exchanger 3, a compression type heat pump 4, a heat supply network heat exchanger 5, a condenser 6, a heat well 7, a condensate pump 8, an electric boiler 9 and related pipelines; the exhaust end of the steam turbine 1 is connected with the inlet of the exhaust heat exchanger 3, the outlet of the exhaust heat exchanger 3 is connected with the condenser 6, the condenser 6 is connected with the hot well 7, and the bottom of the hot well 7 is connected with the condensate pump 8; the heat absorption end of the compression heat pump 4 is connected with the exhaust steam heat exchanger 3, and the heat release end of the compression heat pump 4 is connected with the heat supply network heat exchanger 5; the output shaft of the steam turbine 1 is connected with the driving shaft of the generator 2, and the output end of the generator 2 is respectively connected with the compression heat pump 4, the electric boiler 9 and the power grid.
And a power supply interface of the compression heat pump 4 is connected with the output end of the generator 2 and a power grid.
And a power supply interface of the electric boiler 9 is connected with the output end of the generator 2 and a power grid.
The outlet of the exhaust steam heat exchanger 3 is connected with a condenser 6, the condenser 6 is connected with a hot well 7, and the bottom of the hot well 7 is connected with a condensate pump 8.
The thermoelectric decoupling system further comprises a heat storage tank 10, wherein an inlet of the heat storage tank 10 is communicated with a steam outlet of the electric boiler 9, and an outlet of the heat storage tank 10 is communicated with a steam pipeline.
In a specific embodiment, taking a 600MW subcritical coal-fired thermal power straight condensing unit as an example, the rated power generation is 600MW, and the thermal power of the turbine exhaust steam discharged to the environment through a condenser and a cooling tower is about 825 MW. In the thermoelectric decoupling system in this embodiment, when the compression heat pump fully absorbs the waste heat discharged by the steam turbine, the COP of the heat pump is 3, the consumed electric power is about 412MW, the generated heating power is 1237MW, and 188MW of electric power can be provided; if an electric boiler is further adopted for heating, the heating capacity of 178MW can be generated according to the efficiency of the electric boiler of 0.95; therefore, the total heating capacity of the system can reach 1415MW under the condition of no external power supply. Furthermore, adopt the utility model discloses a thermoelectric decoupling zero system, realization heat energy and electric energy that can also be nimble are adjusted, and the electric power that only needs adjustment input electric boiler and compression heat pump can be realized, can realize external 600MW pure power supply in theory to and 1415MW switching of arbitrary operating parameter between the pure heat supply.
To sum up, the utility model provides a pair of thermoelectric decoupling zero system of thermal power generating unit through the electric drive compression heat pump 4 with generator 2 production, absorbs the external heat supply of a net return water that used heat is arranged in heating heat supply network heat exchanger 5 from 1 steam exhaust of steam turbine, has realized the purpose of the thermoelectric decoupling zero of coal-fired thermal power generating unit, and make full use of the used heat of steam turbine steam exhaust has simultaneously increased substantially the utilization efficiency of energy.
The foregoing shows and describes the general principles and features of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, but rather, the embodiments and descriptions are provided to illustrate the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, all of which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents.
Claims (5)
1. The utility model provides a thermoelectric decoupling system of thermal power generating unit, includes steam turbine, generator, exhaust heat exchanger, compression heat pump, heat supply network heat exchanger and electric boiler, its characterized in that: the steam exhaust end of the steam turbine is connected with the inlet of the steam exhaust heat exchanger; the exhaust steam heat exchanger is connected with the heat absorption end of the compression heat pump; the heat release end of the compression heat pump is connected with the heat supply network heat exchanger; the output shaft of the steam turbine is connected with the driving shaft of the generator, and the output end of the generator is respectively connected with the compression heat pump, the electric boiler and the power grid.
2. The thermal power generating unit thermoelectric decoupling system of claim 1, characterized in that: and a power supply interface of the compression heat pump is connected with the output end of the generator and a power grid.
3. The thermal power generating unit thermoelectric decoupling system of claim 1, characterized in that: and a power supply interface of the electric boiler is connected with the output end of the generator and a power grid.
4. The thermal power generating unit thermoelectric decoupling system of claim 1, characterized in that: the outlet of the exhaust steam heat exchanger is connected with a condenser, the condenser is connected with a hot well, and the bottom of the hot well is connected with a condensate pump.
5. The thermal power generating unit thermoelectric decoupling system of claim 1, characterized in that: the thermoelectric decoupling system further comprises a heat storage tank, an inlet of the heat storage tank is communicated with a steam outlet of the electric boiler, and an outlet of the heat storage tank is communicated with the steam pipeline.
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| CN202023251832.0U CN214007248U (en) | 2020-12-29 | 2020-12-29 | Thermoelectric decoupling system of thermal power generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575949A (en) * | 2022-03-28 | 2022-06-03 | 西安交通大学 | Efficient environment-friendly comprehensive energy supply system based on coal-fired boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114575949A (en) * | 2022-03-28 | 2022-06-03 | 西安交通大学 | Efficient environment-friendly comprehensive energy supply system based on coal-fired boiler |
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