CN216307758U - Heat regenerative system of cogeneration unit - Google Patents

Heat regenerative system of cogeneration unit Download PDF

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Publication number
CN216307758U
CN216307758U CN202122513553.5U CN202122513553U CN216307758U CN 216307758 U CN216307758 U CN 216307758U CN 202122513553 U CN202122513553 U CN 202122513553U CN 216307758 U CN216307758 U CN 216307758U
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low
pressure heater
steam
unit
water
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CN202122513553.5U
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李文斌
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Jiangsu Lee and Man Paper Manufacturing Co Ltd
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Jiangsu Lee and Man Paper Manufacturing Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/52Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/14Combined heat and power generation [CHP]

Abstract

The utility model discloses a heat recovery system of a cogeneration unit, which comprises a steam turbine, and a low-pressure heating unit, a deoxidizing unit and a high-pressure heating unit which are sequentially connected in series according to the flow direction of fluid, wherein the low-pressure heating unit, the deoxidizing unit and the high-pressure heating unit all use extracted steam of the steam turbine with different pressures and different temperatures as heating steam sources; the low-pressure heating unit comprises a first low-pressure heater, a second low-pressure heater and a third low-pressure heater which are connected in series, the first low-pressure heater is connected with the return water of the heat pump, the second low-pressure heater is connected with the cold slag water, and the third low-pressure heater is connected with the return water of the workshop. According to the utility model, the cold slag water, the heat pump return water and the workshop return water are analyzed and researched by adopting an energy cascade utilization principle, so that the water quality of different sections of the water supply system is gradually increased in temperature, and the water quality with the corresponding temperature of the water supply system is heated by utilizing different temperature levels of the cold slag water, the heat pump recovery water and the workshop return water, so that the heat energy is maximally utilized.

Description

Heat regenerative system of cogeneration unit
Technical Field
The utility model relates to a regenerative system, in particular to a regenerative system of a cogeneration unit.
Background
With the increasingly prominent contradiction between economic development and energy and environment in China, the energy conservation and emission reduction of thermal power generating units become a problem of great concern. Meanwhile, the emission standard of pollutants in a thermal power plant is continuously improved, so that the fuel consumption is further reduced, and the thermal efficiency of a unit is improved. This also puts higher demands on the thermal economy of the thermal power generating unit. As an auxiliary device of a steam turbine, a regenerative system is an important component of a thermal system of a thermal power plant, and the quality of the thermal economy of the power plant depends on the operation condition of the regenerative system to a great extent. The water supply system is heated by using the extraction steam of each section of the steam turbine, so that the waste heat of the steam can be fully utilized, the loss of a cold source is reduced, and the efficiency of thermal cycle is improved. The efficient recycling of the low-grade waste heat resources of the coal-fired power station is an effective way for improving the energy conversion efficiency of the coal-fired power station. In the cogeneration system, because the cold slag water, the heat pump backwater and the heat recovery water in a workshop have lower heat energy grade, the cold slag water, the heat pump backwater and the heat recovery water in the workshop are directly supplemented into the deaerator, so that the steam consumption of the deaerator is increased and the steam extraction of the later stages is reduced, thereby reducing the efficiency of the heat recovery system and increasing the cold source loss of a steam turbine.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a heat regeneration system of a cogeneration unit, which can be used for analyzing the heat energy of cold slag water, heat pump return water and hot water in a workshop and heating a working medium matched with the cold slag water, the heat pump return water and the hot water by utilizing the heat energy of the heat regeneration system, thereby improving the efficiency of the heat regeneration system and reducing the energy consumption.
In order to solve the technical problems, the utility model provides a heat recovery system of a cogeneration unit, which comprises a steam turbine, and a low-pressure heating unit, a deoxidizing unit and a high-pressure heating unit which are sequentially connected in series according to the flow direction of fluid, wherein the low-pressure heating unit, the deoxidizing unit and the high-pressure heating unit all use extracted steam of the steam turbine with different pressures and different temperatures as heating steam sources; the low-pressure heating unit comprises a first low-pressure heater, a second low-pressure heater and a third low-pressure heater which are connected in series, the first low-pressure heater is connected with the return water of the heat pump, the second low-pressure heater is connected with the cold slag water, and the third low-pressure heater is connected with the return water of the workshop.
Further, the first low-pressure heater uses 6-stage non-regulated extraction steam of 0.03 bar and 70 ℃ of the steam turbine as a heating steam source, the second low-pressure heater uses 5-stage non-regulated extraction steam of 0.09 bar and 101 ℃ of the steam turbine as a heating steam source, and the third low-pressure heater uses 4-stage non-regulated extraction steam of 0.21 bar and 170 ℃ of the steam turbine as a heating steam source.
Further, the high-pressure heating unit comprises a first high-pressure heater and a second high-pressure heater which are connected in series, the first high-pressure heater is connected with the deoxidizing unit, and the second high-pressure heater is connected with a steam turbine through a boiler.
Further, the first high-pressure heater takes 2-stage non-regulated extraction steam with 1.51 bar and 316 ℃ of the steam turbine as a heating steam source, and the second high-pressure heater takes 1-stage non-regulated extraction steam with 2.51 bar and 440 ℃ of the steam turbine as a heating steam source.
Further, the deaerating unit is a deaerator, and the deaerator takes 3-grade non-adjusted extraction steam of the steam turbine at 0.82MPa and 255 ℃ as a heating steam source.
Further, the temperature of the first low-pressure heater is 65.9-66.5 ℃, and the temperature of the return water of the heat pump is 65.6-66.5 ℃.
Further, the temperature of the second low-pressure heater is 90.5-91.3 ℃, and the temperature of the cold slag water is 90.8-91.2 ℃.
Further, the temperature of the third low-pressure heater is 130.3-131.5 ℃, and the temperature of the hot return water of the workshop is 130.2-131.5 ℃.
Further, the steam extraction pipeline of the steam turbine is provided with a side-mounted check valve.
Further, the steam turbine is connected with the first low-pressure heater through a condenser.
The utility model achieves the following beneficial effects:
1. by analyzing and researching cold slag water, heat pump return water and workshop return water by adopting an energy cascade utilization principle, water quality of different sections of a water supply system is gradually increased in temperature, and the water quality with the corresponding temperature of the water supply system is heated by utilizing different temperature levels of the cold slag water, the heat pump recovery water and the workshop return water, so that heat energy is utilized to the maximum extent.
2. The steam extraction pipeline of the steam turbine adopts a side-mounted check valve to replace the existing top-mounted check valve, thereby improving the safety of steam extraction reversion, reducing pressure loss and achieving the purpose of energy conservation.
Drawings
Fig. 1 is a flow diagram of a cogeneration unit regenerative system of the present invention.
Detailed Description
The utility model is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the present invention provides a heat recovery system for a cogeneration unit, which includes a steam turbine 1, and a low-pressure heating unit, a deoxidizing unit and a high-pressure heating unit which are sequentially connected in series according to a flow direction of a fluid, wherein the low-pressure heating unit, the deoxidizing unit and the high-pressure heating unit all use extracted steam of the steam turbine 1 at different pressures and different temperatures as a heating steam source; the low-pressure heating unit comprises a first low-pressure heater 2, a second low-pressure heater 3 and a third low-pressure heater 4 which are connected in series, the first low-pressure heater 2 is connected with a heat pump backwater 5, the second low-pressure heater 3 is connected with a cold slag water 6, and the third low-pressure heater 4 is connected with a back heating water 7 of a workshop. The high-pressure heating unit comprises a first high-pressure heater 8 and a second high-pressure heater 9 which are connected in series, the first high-pressure heater 8 is connected with the deoxidizing unit, and the second high-pressure heater 9 is connected with the steam turbine 1 through a boiler 12. The steam turbine 1 is connected to the first low-pressure heater 2 via a condenser 10.
The first low-pressure heater 2 uses 6-stage non-regulated extraction steam of 0.03 bar and 70 ℃ of the steam turbine 1 as a heating steam source, the second low-pressure heater 3 uses 5-stage non-regulated extraction steam of 0.09 bar and 101 ℃ of the steam turbine 1 as a heating steam source, and the third low-pressure heater 4 uses 4-stage non-regulated extraction steam of 0.21 bar and 170 ℃ of the steam turbine 1 as a heating steam source.
The first high-pressure heater 8 takes 2-stage non-regulated extraction steam with 1.51 bar and 316 ℃ of the steam turbine 1 as a heating steam source, and the second high-pressure heater 9 takes 1-stage non-regulated extraction steam with 2.51 bar and 440 ℃ of the steam turbine 1 as a heating steam source.
The deaerating unit is a deaerator 11, and the deaerator 11 takes 3-grade non-adjustment extraction steam of 0.82MPa and 255 ℃ of the steam turbine 1 as a heating steam source.
The method comprises the steps of firstly analyzing cold slag water 6, heat pump backwater 5 and workshop backheating water 7, confirming the temperature and enthalpy values of three water qualities, determining the temperatures of inlet and outlet water qualities of a first low-pressure heater 2, a second low-pressure heater 3 and a third low-pressure heater 4 by researching each section of a water supply system, and reconnecting the make-up water to a position with proper temperature by adopting the principle of 'temperature to port and cascade utilization'. The temperature of the first low-pressure heater 2 is 65.9-66.5 ℃, and the temperature of the heat pump return water 5 is 65.6-66.5 ℃. The temperature of the second low-pressure heater 3 is 90.5-91.3 ℃, and the temperature of the cold slag water 6 is 90.8-91.2 ℃. The temperature of the third low-pressure heater 4 is 130.3-131.5 ℃, and the temperature of the regenerative water 7 of the workshop is 130.2-131.5 ℃. According to the utility model, the cold slag water, the heat pump return water and the workshop return water are analyzed and researched by adopting an energy cascade utilization principle, so that the water quality of different sections of the water supply system is gradually increased in temperature, and the water quality with the corresponding temperature of the water supply system is heated by utilizing different temperature levels of the cold slag water, the heat pump recovery water and the workshop return water, so that the heat energy is maximally utilized.
The extraction pipeline of the steam turbine 1 is provided with a side-mounted check valve. The steam extraction pipeline of the steam turbine 1 adopts a side-mounted check valve to replace the existing top-mounted check valve, thereby improving the safety of steam extraction reversion, reducing pressure loss and achieving the purpose of energy conservation.
The utility model saves raw coal by 0.4t/h, saves 3200 tons of raw coal every year, saves 150 ten thousand yuan every year, and comprehensively saves 2200 tons of standard coal. The coal consumption of the heat supply standard is less than 38kgce/GJ, and the requirement that the standard of the national standard 'energy consumption limit of cogeneration unit products' GB35574-2017 is lower than 42.5 kgce/GJ is met.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several 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 (10)

1. The regenerative system of the cogeneration unit is characterized by comprising a steam turbine, and a low-pressure heating unit, a deoxidizing unit and a high-pressure heating unit which are sequentially connected in series according to the flow direction of fluid, wherein the low-pressure heating unit, the deoxidizing unit and the high-pressure heating unit all use extracted steam of the steam turbine at different pressures and different temperatures as heating steam sources; the low-pressure heating unit comprises a first low-pressure heater, a second low-pressure heater and a third low-pressure heater which are connected in series, the first low-pressure heater is connected with the return water of the heat pump, the second low-pressure heater is connected with the cold slag water, and the third low-pressure heater is connected with the return water of the workshop.
2. The cogeneration unit heat recovery system of claim 1, wherein the first low pressure heater uses 6-stage unregulated extraction steam of 0.03 bar and 70 ℃ of the turbine as a heating steam source, the second low pressure heater uses 5-stage unregulated extraction steam of 0.09 bar and 101 ℃ of the turbine as a heating steam source, and the third low pressure heater uses 4-stage unregulated extraction steam of 0.21 bar and 170 ℃ of the turbine as a heating steam source.
3. The cogeneration unit regenerative system of claim 1, wherein the high pressure heating unit comprises a first high pressure heater and a second high pressure heater connected in series, the first high pressure heater is connected with the oxygen removal unit, and the second high pressure heater is connected with a steam turbine through a boiler.
4. The cogeneration unit recuperator system of claim 3, wherein said first high pressure heater has a 2-stage unregulated extraction of 1.51 bar, 316 ℃ from said turbine as a heating steam source, and said second high pressure heater has a 1-stage unregulated extraction of 2.51 bar, 440 ℃ from said turbine as a heating steam source.
5. The cogeneration unit regenerative system according to claim 1, wherein the deaerator unit is a deaerator that uses a 3-stage non-regulated extraction of 0.82MPa at 255 ℃ of the steam turbine as a heating steam source.
6. The cogeneration unit regenerative system of claim 1, wherein the temperature of the first low-pressure heater is 65.9-66.5 ℃ and the temperature of the heat pump return water is 65.6-66.5 ℃.
7. The cogeneration unit regenerative system of claim 1, wherein the temperature of the second low-pressure heater is 90.5-91.3 ℃ and the temperature of the cold slag water is 90.8-91.2 ℃.
8. The cogeneration unit regenerative system of claim 1, wherein the temperature of the third low-pressure heater is 130.3-131.5 ℃ and the temperature of the plant return water is 130.2-131.5 ℃.
9. The cogeneration unit recuperator system of claim 1, wherein the steam extraction duct of the steam turbine is provided with a side-mounted check valve.
10. The cogeneration unit regenerative system according to claim 1, wherein the turbine is connected to the first low-pressure heater through a condenser.
CN202122513553.5U 2021-10-19 2021-10-19 Heat regenerative system of cogeneration unit Active CN216307758U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202122513553.5U CN216307758U (en) 2021-10-19 2021-10-19 Heat regenerative system of cogeneration unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202122513553.5U CN216307758U (en) 2021-10-19 2021-10-19 Heat regenerative system of cogeneration unit

Publications (1)

Publication Number Publication Date
CN216307758U true CN216307758U (en) 2022-04-15

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CN202122513553.5U Active CN216307758U (en) 2021-10-19 2021-10-19 Heat regenerative system of cogeneration unit

Country Status (1)

Country Link
CN (1) CN216307758U (en)

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