CN102220888B - Method and system for recovering circulating water residual heat of thermal power plants - Google Patents
Method and system for recovering circulating water residual heat of thermal power plants Download PDFInfo
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- CN102220888B CN102220888B CN201110121236.7A CN201110121236A CN102220888B CN 102220888 B CN102220888 B CN 102220888B CN 201110121236 A CN201110121236 A CN 201110121236A CN 102220888 B CN102220888 B CN 102220888B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000010521 absorption reaction Methods 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 32
- 238000000605 extraction Methods 0.000 claims abstract description 26
- 239000002918 waste heat Substances 0.000 claims description 38
- 238000001816 cooling Methods 0.000 claims description 18
- 238000011084 recovery Methods 0.000 claims description 11
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 3
- 238000003303 reheating Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 14
- 238000005516 engineering process Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010908 plant waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat 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
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention provides a method and system for recovering the circulating water residual heat of thermal power plants. The system comprises an absorption type heat pump, a turbine, a condenser, a basic heat supply network heater, a peak heater, an auxiliary pipe, auxiliary equipment and a coordination control and protection system, wherein the absorption type heat pump is used for recovering the residual heat of circulating water of the condenser and heating return water of a main heat supply network; the basic heat supply network heater is used for heating the return water of the main heat supply network, which is heated by the absorption type heat pump; the peak heater is used for heating the return water of the main heat supply network, which is heated by the basic heat supply network heater and conveying the return water to users of the heat supply network; the auxiliary pipe is connected with the turbine, the condenser, the absorption type heat pump, the basic heat supply network heater, the peak heater and the auxiliary equipment; and the running and the safety of all equipment in the system are controlled by the coordination control and protection system. The invention has the advantages that heat which is discharged by the circulating water of the condenser to the air is recovered by the absorption type heat pump, the heating and steam extraction energy level of the thermal power plants is integrated, the energy of the thermal power plants is saved, and the heat supply capability and economy of the thermal power plants are improved.
Description
Technical Field
The invention relates to a power plant waste heat recovery technology, in particular to a circulating water waste heat treatment technology, and specifically relates to a method and a system for recovering circulating water waste heat of a thermal power plant.
Background
The power generation mode of the power plant comprises pure condensation power generation, cogeneration and the like. After steam generated by the boiler of the pure condensing power plant drives the steam turbine generator unit to generate electricity, most of heat contained in the discharged steam is taken away by cooling water, so that the heat efficiency is low, and the heat efficiency of the pure condensing power plant with the single-machine capacity of more than 200MW is only 35-40%. Although the cogeneration technology can improve the energy utilization efficiency, the steam turbine still has a large amount of exhaust heat which is taken away by the circulating cooling water and released to the atmosphere, so that energy waste is caused.
The heating steam quantity of many thermal power plants can not satisfy the heat supply demand of the heat supply network, so that the water supply temperature of the heat supply network can not reach the design value for a long time, and the heat supply capacity is insufficient. Fig. 1 is a schematic diagram showing the structure and design values of a heat supply network of a conventional thermal power plant, and as shown in fig. 1, the conventional thermal power plant is divided into a main network and a secondary network, the main network is heated by two stages of a basic heat supply network heater and a peak heater, and the temperature of circulating water is designed to be heated from 70 ℃ to 150 ℃. The auxiliary net adopts single-stage heating, uses high-temperature steam, and is designed to heat the temperature of the heating net water from 75 ℃ to 135 ℃. However, the actual heating capacity does not reach the designed value, as shown in fig. 2, the return water temperature of the heat supply network of the main network is 55 ℃, and the temperature can only reach 132.7 ℃ after two-stage heating, which is less than the designed 150 ℃. The return water temperature of the heat supply network of the auxiliary network is 66 ℃, and the temperature can only reach 130.2 ℃ after single-stage heating and is less than the designed 135 ℃.
Therefore, how to recover the waste heat of the circulating water to increase the water supply temperature of the main network and the secondary network has become a problem to be solved urgently.
Disclosure of Invention
The invention provides a method and a system for recovering the waste heat of circulating water of a thermal power plant, which are used for improving the thermal efficiency of the thermal power plant.
In order to achieve the above object, the present invention provides a method for recovering waste heat of circulating water in a thermal power plant, which is applied to a thermal power plant system including a steam turbine, a condenser, an absorption heat pump, a basic heat supply network heater, a peak heater, a booster pump, a cooling tower, an auxiliary pipeline, a device thereof, and a coordination control and protection system, and the method includes: introducing circulating water, steam extraction of a steam turbine and return water of a main network heat supply network into the absorption heat pump; the absorption heat pump takes steam extraction of a steam turbine as power to recover waste heat in circulating water and heat the return water of the main network heat supply network; and the main network heat supply network backwater heated by the absorption heat pump is heated by the first basic heat supply network heater and the first peak heater in sequence and then is conveyed to a heat supply network user.
Further, the method further comprises: introducing the return water of the auxiliary network heat supply network and the extracted steam of the steam turbine into a second basic heat supply network heater; the second basic heat supply network heater heats the return water of the auxiliary network heat supply network; and conveying the secondary network heat supply network backwater heated by the second basic heat supply network heater to a heat supply network user after passing through the second peak heater.
Further, introduce absorption heat pump with circulating water, steam turbine extraction and major network heat supply network return water, include: and introducing the circulating water into the absorption heat pump through a condenser and a booster pump in sequence to be used as heat source water recovered by the absorption heat pump.
Furthermore, the circulating water is divided into two paths after passing through the absorption heat pump, one path of the circulating water returns to the condenser through a first circulating water pipeline, the other path of the circulating water is discharged to a cooling water tower through a second circulating water pipeline, and the first circulating water pipeline and the second circulating water pipeline both adopt double-pipeline double valves.
Further, the condenser with including the control valve between the cooling tower, the control valve adopts the quick valve of opening, and full open time is less than or equal to 45 seconds, the control valve adopts the emergency power supply of power plant.
In order to achieve the above object, the present invention provides a system for recovering waste heat of circulating water in a thermal power plant, comprising: the system comprises a steam turbine, a condenser, an absorption heat pump, a first basic heat supply network heater, a first peak heater, an auxiliary pipeline and equipment thereof, and a coordination control and protection system; the absorption heat pump is used for recovering waste heat in circulating water by taking steam extraction of a steam turbine as power and heating return water of the main network heat supply network; the first basic heat supply network heater heats the main network heat supply network backwater heated by the absorption heat pump; the first peak heater heats the main network heat supply network backwater heated by the first basic heat supply network heater in a heat supply peak period, and the main network heat supply network backwater is heated and conveyed to a heat supply network user; the auxiliary pipeline is used for connecting the steam turbine, the absorption heat pump, the first basic heat supply network heater, the first peak heater and the auxiliary equipment; the coordinated control and protection system is used for coordinating and controlling the operation and safety of all equipment in the waste heat recovery system.
Further, the system further comprises: the second basic heat supply network heater is used for primarily heating the return water of the auxiliary network heat supply network; and the second peak heat supply network heater is used for reheating and heating the secondary network heat supply network backwater primarily heated by the second basic heat supply network heater and conveying the reheated secondary network heat supply network backwater to a heat supply network user.
Further, the system further comprises: the condenser is used for cooling exhaust steam of the steam turbine by circulating water; and the booster pump is used for boosting the circulating water.
Further, the system further comprises: the first circulating water pipeline is used for returning the circulating water passing through the absorption heat pump to the condenser; the second circulating water pipeline is used for discharging the circulating water passing through the absorption heat pump to the cooling tower; and the first circulating water pipeline and the second circulating water pipeline both adopt double pipelines and double valves.
Further, the condenser with including the control valve between the cooling tower, the control valve adopts the quick valve of opening, and full open time is less than or equal to 45 seconds, the control valve adopts the emergency power supply of power plant.
The embodiment of the invention has the advantages that the absorption heat pump is utilized to recover the heat discharged to the atmosphere by the circulating cooling water of the condenser, the return water of the main network heat supply network is heated and heated, the heating and steam extraction energy level of the whole thermal power plant is integrated, and the heat supply capacity and the economical efficiency of the thermal power plant are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
FIG. 1 is a schematic diagram of the structure and design values of a heat supply network of a conventional thermal power plant;
FIG. 2 is a schematic diagram of the structure and actual values of a heat supply network of a conventional thermal power plant;
FIG. 3 is a schematic diagram of a conventional thermal power plant thermodynamic system;
FIG. 4 is a schematic view of a system for recovering waste heat from circulating water of a thermal power plant according to an embodiment of the present invention;
FIG. 5 is a schematic illustration of the thermodynamic equilibrium of an embodiment of the present invention;
FIG. 6 is a schematic diagram of circulating water of a heat pump in the circulating water waste heat recovery system of the thermal power plant according to the embodiment of the invention;
FIG. 7 is a schematic diagram of heat pump driving steam in the circulating water waste heat recovery system of the thermal power plant according to the embodiment of the invention;
FIG. 8 is a schematic diagram of the auxiliary grid basic heat supply network heater extraction and drainage after the thermal power plant extraction according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of secondary network backwater heating according to an embodiment of the invention;
FIG. 10 is a flow chart of a method for recovering waste heat of circulating water of a thermal power plant according to an embodiment of the present invention;
FIG. 11 is a flow chart of a method for recovering the waste heat of the circulating water of the thermal power plant according to another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 3 is a schematic diagram of a thermal system of a thermal power plant, and as shown in fig. 3, circulating water of the thermal system of the thermal power plant passes through a condenser and then brings exhaust waste heat of a steam turbine into a cooling tower, and is discharged into the atmosphere after being cooled by the cooling tower, thereby causing heat waste.
As shown in fig. 4, an embodiment of the present invention provides a system for recovering waste heat of circulating water in a thermal power plant, including: the system comprises a steam turbine 401, an absorption heat pump 402, a first basic heat supply network heater (basic heat supply network heater 403), a first spike heater (spike heater 404), a condenser 405, an auxiliary pipeline, auxiliary pipeline equipment and a coordination control and protection system.
The absorption heat pump (heat pump for short) 402 is used for recovering waste heat in circulating water of a condenser by taking steam extraction of a steam turbine as power, heating return water of a main heat supply network, heating the return water of the main heat supply network heated by the absorption heat pump by the basic heat supply network heater 403, heating the return water of the main heat supply network heated by the basic heat supply network heater 403 by the peak heater 404 at a heat supply peak time period, raising the temperature of the return water of the main heat supply network, and conveying the return water to a heat supply network user, the auxiliary pipeline is used for connecting the steam turbine 401, the absorption heat pump 402, the basic heat supply network heater 403 and the peak heater 404, and the auxiliary pipeline is provided with a control valve which comprises a control valve 407 and a control valve 410 and can control the steam extraction amount of the steam turbine or the flow and the temperature of water by the control.
The coordinated control and protection system is used for ensuring the safety of the generator set and the waste heat recovery equipment.
As shown in fig. 4, the system for recovering the waste heat of the circulating water in the thermal power plant further comprises: the system comprises a condenser 405 and a booster pump 406, wherein the condenser is used for cooling exhaust steam of a steam turbine by circulating water; and the booster pump is used for boosting the circulating water.
Preferably, the number of the condensers of the present invention may be 2, which is not limited by the present invention.
The control valve 407 is positioned between the condenser 405 and the cooling tower, the control valve 407 adopts a quick opening valve, the full opening time is less than or equal to 45 seconds, and the control valve 407 adopts a security power supply of a power plant.
As shown in fig. 4, the circulating water enters the condenser 405 through the auxiliary pipeline, absorbs the exhaust steam heat of the steam turbine, passes through the condenser 405, is trapped by the control valve 407 on the way to the cooling tower, is introduced into the booster pump 406 to be boosted, and then enters the absorption heat pump 402, and the heat in the circulating water is recovered by the absorption heat pump 402, flows out of the absorption heat pump 402, and flows back to the condenser 405. The water temperature at the inlet of the condenser can be adjusted through the control valve 410, and the vacuum safety and stability of the steam turbine are guaranteed. The main network heat supply network backwater and the turbine extraction steam can directly enter the absorption heat pump 402 through the auxiliary pipelines respectively. The turbine extraction steam enters a condensate pump 408 after passing through the absorption heat pump 402 and then is delivered to a deaerator. The main network heat supply network backwater is heated in the heat absorption heat pump, enters a basic heat supply network heater 403 for second-stage heating, then enters a peak heater 404 for third-stage heating, and high-temperature water is conveyed to a heat supply network user.
Further, as shown in fig. 4, the system for recovering the waste heat of the circulating water in the thermal power plant further includes: a second basic heat supply network heater (basic heat supply network heater 403) and a second peak heater (peak heater 404), wherein the basic heat supply network heater 403 is used for heating the return water of the auxiliary network heat supply network; the peak heater 404 heats the sub-grid return water heated by the basic heat supply grid heater 403, and delivers the sub-grid return water to the heat supply grid users. Preferably, the number of the low temperature heaters is 2, which is not limited in the present invention.
Fig. 5 is a schematic diagram of the thermodynamic equilibrium of the embodiment of the present invention, and as shown in fig. 5, compared with fig. 1 and fig. 2, an absorption heat pump 402 is added to the main grid of fig. 5, and a basic heat supply network heater 403 is added to the auxiliary grid.
As shown in fig. 5, in the main network, the circulating water at 31.5 ℃ and the 4# turbine extraction steam respectively enter the absorption heat pump 402, and after the circulating water flows out of the absorption heat pump 402, the temperature is reduced to 27.5 ℃, and the heat in the circulating water is absorbed. The extracted steam of the 4# steam turbine becomes condensed water after passing through the absorption heat pump 402. The temperature of the return water of the heat supply network entering the absorption heat pump 402 is 55 ℃, the flow rate is 9000t/h, and the temperature of the return water of the heat supply network is increased from 55 ℃ to 74.3 ℃ after the return water of the heat supply network flows out of the absorption heat pump 402, so that the steam quantity required by the temperature increase of the heating plant is saved. After passing through the basic heat supply network heater 403, the temperature of the main return water is increased from 74.3 ℃ to 109 ℃, and then the main return water enters the peak heater 404 to be heated to 135 ℃.
The steam flow of the thermal power plant left by the absorption heat pump section is utilized to carry out steam extraction energy level integration, the steam extraction heat quantity of the low energy level is fully utilized, 2 heaters are designed in the auxiliary net, the temperature is increased to 108 ℃ after the auxiliary net backwater with the temperature of 66 ℃ and the flow of 3700t/h passes through the basic heat net heater 403, then the temperature is increased to 147 ℃ after passing through the peak heater 404, and the heating steam of the high energy level is saved.
Compared with the prior art in fig. 2, under the condition that the extraction steam volume of the steam turbine is not changed, the temperature of the main network for sending to the heat supply network users is changed from 132 ℃ to 135 ℃, and is increased by 3 ℃, and the temperature of the auxiliary network for sending to the heat supply network users is changed from 130 ℃ to 147 ℃, and is increased by 17 ℃. Therefore, the circulating water waste heat recovery system of the thermal power plant obviously improves the heat supply capacity and the economy of the thermal power plant.
Fig. 6 is a schematic diagram of circulating water of heat pumps in a circulating water waste heat recovery system of a thermal power plant according to an embodiment of the present invention, and as shown in fig. 6, in this embodiment, 10 heat pumps are used according to the circulating water flow of a condenser of a unit. FIG. 7 is a schematic diagram of heat pump driving steam in the circulating water waste heat recovery system of the thermal power plant according to the embodiment of the invention. The recycling of the circulating water waste heat of the main network is to add the absorption heat pump 402 before the existing basic heat supply network heater in fig. 2, so fig. 6 and 7 only specifically show the circulating water treatment process of the absorption heat pump 402, and do not specifically show the heat supply network backwater treatment process of the basic heat supply network heater and the peak heater after the absorption heat pump 402.
As shown in fig. 6, the system for recovering the waste heat of the circulating water in the thermal power plant further comprises: the first circulating water pipeline is used for returning the circulating water passing through the absorption heat pump to the condenser; the second circulating water pipeline is used for discharging the circulating water passing through the absorption heat pump to the cooling tower; the first and second circulating water pipelines both adopt double-pipeline double valves, the double-pipeline double valves can avoid shutdown of the steam turbine set caused by interruption of circulating water due to faults of any pipeline valve, the double-pipeline double valves increase the adjusting range, and the flexibility and the safety of adjustment are improved.
Fig. 8 is a schematic diagram of steam extraction and drainage of a basic auxiliary network heat supply network heater after steam extraction of a thermal power plant is integrated according to an embodiment of the invention, and fig. 9 is a schematic diagram of return water heating of an auxiliary network according to an embodiment of the invention. The integration of the steam extraction energy level of the auxiliary net in the embodiment of the invention is to add a basic heat supply net heater before the existing peak heater in fig. 2, so fig. 8 and 9 only specifically show the heat supply net backwater treatment process of the basic heat supply net heater (#1 basic heat supply net heater and #2 basic heat supply net heater), and do not specifically show the heat supply net backwater treatment process of the peak heater after the basic heat supply net heater.
As shown in fig. 10, an embodiment of the present invention provides a method for recovering waste heat of circulating water in a thermal power plant, which is applied to a thermal power plant system including a steam turbine, a condenser, an absorption heat pump, a basic heat supply network heater, a peak heater, a booster pump, a cooling tower, and an auxiliary pipeline, the method for recovering waste heat of circulating water in a thermal power plant includes:
step S1001: introducing circulating water, turbine extraction steam and main network heat supply network return water into the absorption heat pump 402; circulating water is introduced into the absorption heat pump 402 through the condenser 405 and the booster pump 406 in sequence, main grid return water flows into the absorption heat pump 402 through the auxiliary pipeline, and turbine extraction steam generated by the turbine 401 enters the absorption heat pump 402 through the auxiliary pipeline.
Step S1002: and the heat of the extracted steam of the steam turbine is used as power, and the absorption heat pump 402 recovers the waste heat in the circulating water to heat the return water of the main network heat supply network.
Step S1003: and (3) the main network heat supply network backwater heated by the absorption heat pump passes through a first basic heat supply network heater (basic heat supply network heater 403) and a first peak heater (peak heater 404) in sequence and then is conveyed to a heat supply network user.
As can be seen from fig. 5, in the main network, the circulating water at 31.5 ℃ and the extraction steam of the 4# turbine enter the absorption heat pump 402 respectively by using the method of the present invention, and after the circulating water flows out of the absorption heat pump 402, the temperature is reduced to 27.5 ℃, and the heat in the circulating water is absorbed. The temperature of the return water of the heat supply network entering the absorption heat pump 402 is 55 ℃, the flow rate is 9000t/h, the temperature of the return water of the heat supply network is increased to 74.3 ℃ from 55 ℃ after the return water of the heat supply network flows out of the absorption heat pump 402, the temperature of the return water of the main network is increased to 109 ℃ from 74.3 ℃ after the return water of the main network passes through the basic heat supply network heater 403, and then the return water of the main network enters the peak heater 404 to be increased to 135 ℃, which is 3.
As shown in fig. 11, the method for recovering the waste heat of the circulating water in the thermal power plant of the present invention further includes:
step S1101: the sub-grid heat-supply-network return water and the turbine extraction steam are led to a second basic heat-supply-network heater (basic heat-supply-network heater 403).
Step S1102: the cycle process of heating the return water of the auxiliary network by the basic heat supply network heater 403, introducing the return water of the auxiliary network heat supply network and the extracted steam of the steam turbine into the basic heat supply network heater 403 and heating the return water of the auxiliary network heat supply network is shown in fig. 8 and 9, and is not described again.
Step S1103: and (3) conveying the secondary network heat supply network backwater heated by the basic heat supply network heater 403 to a heat supply network user after passing through a second peak heater (a peak heater 404).
As shown in fig. 6, the circulating water is divided into two paths after passing through the absorption heat pump 402, one path returns to the condenser through a first circulating water pipeline, the other path is discharged to the cooling tower through a second circulating water pipeline, the first and second circulating water pipelines both adopt double-pipeline double valves, the double-pipeline double valves can avoid the shutdown of the turbine set caused by the interruption of the circulating water due to the failure of any pipeline valve, and the double-pipeline double valves increase the adjustment range and improve the flexibility and the safety of adjustment.
As shown in fig. 5, in the secondary network, the temperature was 66 ℃ and the flow rate was 3700t/h of return water from the heat supply network after passing through the basic heat supply network heater 403, the temperature was increased to 108 ℃, and then the temperature was increased to 147 ℃ after passing through the peak heater 404.
In the process of recycling the circulating water waste heat of the main network and the auxiliary network, the flow of the auxiliary pipeline is controlled through the control valve.
The embodiment of the invention has the advantages that the absorption heat pump is utilized to recover the heat discharged to the atmosphere by the circulating water of the condenser, the steam quantity required by the heating heat supply network backwater of the thermal power plant is saved, the basic heat supply network heater is additionally arranged by utilizing the saved steam quantity, the temperature of the subsidiary heat supply network backwater is increased by the basic heat supply network heater, the heating steam extraction of the whole thermal power plant is integrated according to the energy level, and the heat supply capacity and the economical efficiency of the thermal power plant are improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method for recovering the waste heat of circulating water in a thermal power plant is applied to a thermal power plant system comprising a steam turbine, a condenser, an absorption heat pump, a basic heat supply network heater, a peak heater, a booster pump, a cooling tower, an auxiliary pipeline and equipment thereof, and a coordinated control and protection system, and is characterized by comprising the following steps of:
introducing circulating water, steam extraction of a steam turbine and return water of a main network heat supply network into the absorption heat pump;
the absorption heat pump recovers the waste heat in the circulating water to heat the return water of the main network heat supply network;
the main network heat supply network backwater heated by the absorption heat pump is heated by a first basic heat supply network heater and a first peak heater in sequence and then is conveyed to a heat supply network user;
introducing the return water of the auxiliary network heat supply network and the extracted steam of the steam turbine into a second basic heat supply network heater;
the second basic heat supply network heater heats the return water of the auxiliary network heat supply network;
and conveying the secondary network heat supply network backwater heated by the second basic heat supply network heater to a heat supply network user after passing through the second peak heater.
2. The method of claim 1, wherein introducing the circulating water, turbine extraction steam, and main network heat supply network return water into the absorption heat pump comprises:
and introducing the circulating water into the absorption heat pump through a condenser and a booster pump in sequence.
3. The method according to claim 2, wherein the circulating water is divided into two paths after passing through the absorption heat pump, one path returns to the condenser through a first circulating water path, the other path is discharged to a cooling water tower through a second circulating water path, and the first and second circulating water paths adopt double-path double valves.
4. The method of claim 3, wherein a control valve is included between the condenser and the cooling tower, the control valve is a quick-opening valve, the full-opening time is less than or equal to 45 seconds, and the control valve is a safety power supply of a power plant.
5. The utility model provides a thermal power plant circulating water waste heat recovery system which characterized in that, thermal power plant circulating water waste heat recovery system include: the system comprises a steam turbine, a condenser, an absorption heat pump, a first basic heat supply network heater, a first peak heater, an auxiliary pipeline and equipment thereof, a coordination control and protection system, a second basic heat supply network heater and a second peak heat supply network heater; wherein,
the absorption heat pump is used for recovering waste heat in circulating water by taking steam extracted by a steam turbine as power and heating the return water of the main network heat supply network;
the first basic heat supply network heater heats the main network heat supply network backwater heated by the absorption heat pump;
the first peak heater heats the main network heat supply network backwater heated by the first basic heat supply network heater in a heat supply peak period, and the main network heat supply network backwater is heated and conveyed to a heat supply network user;
the auxiliary pipeline is used for connecting the steam turbine, the absorption heat pump, the first basic heat supply network heater, the first peak heater and the auxiliary equipment; a second control valve is arranged on the auxiliary pipeline, and the water temperature at the inlet of the condenser is regulated through the second control valve;
the coordinated control and protection system is used for coordinating and controlling the operation and safety of each device in the waste heat recovery system;
the second basic heat supply network heater is used for carrying out primary heating on the return water of the auxiliary network heat supply network;
and the second peak heat supply network heater is used for reheating and heating the secondary network heat supply network backwater primarily heated by the second basic heat supply network heater and conveying the secondary network heat supply network backwater to a heat supply network user.
6. The system of claim 5, wherein the system for recovering the waste heat of the circulating water of the thermal power plant further comprises: the condenser is used for cooling exhaust steam of the steam turbine by circulating water; and the booster pump is used for boosting the circulating water.
7. The system of claim 6, wherein said system further comprises:
the first circulating water pipeline is used for returning the circulating water passing through the absorption heat pump to the condenser;
the second circulating water pipeline is used for discharging the circulating water passing through the absorption heat pump to the cooling tower;
and the first circulating water pipeline and the second circulating water pipeline both adopt double pipelines and double valves.
8. The system of claim 7, wherein a control valve is arranged between the condenser and the cooling tower, the control valve adopts a quick-opening valve, the full-opening time is less than or equal to 45 seconds, and the control valve adopts a safety power supply of a power plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110121236.7A CN102220888B (en) | 2011-05-11 | 2011-05-11 | Method and system for recovering circulating water residual heat of thermal power plants |
Applications Claiming Priority (1)
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