CN212901675U - Energy cascade utilization system for steam turbine at first station of heat supply network - Google Patents
Energy cascade utilization system for steam turbine at first station of heat supply network Download PDFInfo
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- CN212901675U CN212901675U CN202020720197.7U CN202020720197U CN212901675U CN 212901675 U CN212901675 U CN 212901675U CN 202020720197 U CN202020720197 U CN 202020720197U CN 212901675 U CN212901675 U CN 212901675U
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Abstract
The utility model provides a heat supply network head steam turbine energy ladder utilizes system, including steam mechanism, heat supply network circulating water mechanism and hydrophobic condensate water mechanism. The steam mechanism comprises a steam turbine set, a heat supply network initial station steam turbine and a heat supply network heater, and a steam turbine set heating pipeline is connected with the heat supply network initial station steam turbine; the steam turbine at the first station of the heat supply network is provided with a steam extraction pipeline and a steam exhaust pipeline, the steam extraction pipeline is connected with the heat supply network heater, and the steam exhaust pipeline is connected with the input end of the high-back-pressure condenser; the heat supply network circulating water mechanism comprises a high-backpressure condenser, the circulating backwater of the heat supply network is connected with the high-backpressure condenser, the output end of the high-backpressure condenser is connected with the input end of a heat supply network heater, and the heat supply network heater is connected to the circulating water supply of the heat supply network; the drainage and condensation water mechanism comprises a normal drainage pipe, the output end of the normal drainage pipe is connected with the heat supply network heater, the input end of the normal drainage pipe is connected with a condensation water tank of the high-back-pressure condenser, and the condensation water tank of the high-back-pressure condenser is connected to a hot well of the steam turbine set. The utility model provides high energy utilization rate has avoided the energy extravagant.
Description
Technical Field
The application relates to the technical field of thermal power generation, in particular to a heat supply network head steam turbine energy ladder utilization system.
Background
The central heating of the power plant is the most economic and environment-friendly heating mode, the power plant can increase the heat sale income while meeting the heating demand of residents, and the power plant has good economic and social benefits.
In order to meet the increasing heat supply demand of residents, a plurality of power plants perform heat supply transformation on a straight condensing turbine, and heating steam extraction is increased in a mode of transforming medium-low pressure communicating pipes for 660 MW-grade units. In this case, the extraction pressure is high (greater than 0.8MPa), and in order to reduce the equipment price of the heat supply network heater, a pressure reducer is generally arranged to reduce the pressure of the steam to 0.3-0.5 mpa.a, and then the steam is connected to the heat supply network heater. In the process, the energy of the steam pressure difference is not utilized, so that the energy waste is caused.
SUMMERY OF THE UTILITY MODEL
The application provides a heat supply network head steam turbine energy ladder utilizes system to solve the energy that steam pressure differential has and not obtained utilizing, cause the extravagant problem of energy.
The technical scheme adopted by the application is as follows:
the utility model provides a heat supply network head steam turbine energy ladder utilizes system, include:
the steam mechanism comprises a steam turbine set, a heat supply network initial station steam turbine and a heat supply network heater, wherein the steam turbine set is provided with a heating pipeline, and the heating pipeline is connected to the heat supply network initial station steam turbine; the output end of the steam turbine at the first station of the heat supply network is provided with a steam extraction pipeline and a steam exhaust pipeline, the steam extraction pipeline is connected to the heat supply network heater, and the steam exhaust pipeline is connected to the input end of the high-back-pressure condenser;
the heat supply network circulating water mechanism comprises a high-backpressure condenser, the circulating backwater of the heat supply network is connected to the high-backpressure condenser, the output end of the high-backpressure condenser is connected with the input end of the heat supply network heater, and the heat supply network heater is connected to circulating water supply of the heat supply network;
the drainage condensed water mechanism comprises a normal drainage pipe, the output end of the normal drainage pipe is connected with the heat supply network heater, the input end of the normal drainage pipe is connected to the condensed water tank of the high-back-pressure condenser, and the condensed water tank of the high-back-pressure condenser is connected to the hot well of the turbine unit.
Furthermore, the hydrophobic condensed water mechanism also comprises a critical hydrophobic output pipe connected to the heat supply network heater.
Further, hydrophobic condensate water mechanism still includes the hydrophobic flash tank of heat supply network emergency, the hydrophobic output tube of emergency is connected to the input of the hydrophobic flash tank of heat supply network emergency, the output of the hydrophobic flash tank of heat supply network emergency is connected with drainage pipe just drainage pipe is connected to drainage pipe network.
Furthermore, cooling water is connected to the drainage pipeline.
Furthermore, the high back pressure condenser and the hot well are connected through a condensate pipe, and a shaft seal heater is arranged on the condensate pipe.
Further, still include condensate pump, condensate pump sets up on the condensate pipe and be located the bearing seal heater with the high back pressure condenser between.
Further, the heat supply network circulating water mechanism still includes the water purifier, the input of water purifier is connected the heat supply network initial stage heat supply network circulating water return water, the output of water purifier is connected to the high back pressure condenser.
Furthermore, the output end of the high back pressure condenser is connected with the input end of the heat supply network heater through a connecting pipeline, and the connecting pipeline is connected with a heat supply network circulating pump.
Further, a generator is connected to the steam turbine at the first station of the heat supply network.
The technical scheme of the application has the following beneficial effects:
the utility model discloses a heat supply network head steam turbine energy ladder utilizes system adopts heat supply network head steam turbine to replace the pressure reducer, and make full use of pressure differential energy increases the generated energy, reduces the station service power. Meanwhile, a high-back-pressure condenser is adopted in a steam turbine at the first station of the heat supply network, low-quality exhaust steam is utilized to carry out primary heating on circulating water of the heat supply network, and energy utilization efficiency is improved.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a stepped energy utilization system for turbines at a heat supply network head station (only a newly-built heat supply network head station);
fig. 2 is a schematic structural diagram of a stepped energy utilization system of a steam turbine at a first station of a heat supply network (including a newly-built first station of the heat supply network and an original first station of the heat supply network).
Illustration of the drawings:
wherein, 1-steam mechanism: 11-a steam turbine set; 12-heat supply network head station steam turbine; 13. a heat supply network heater; 14. a hot well; 15-a generator;
2-heating network circulating water mechanism: 21-high back pressure condenser; 22-a shaft seal heater; 23-a water filter; 24-heat supply network circulation pump; 25-circulating water returning of the heat supply network; 26-circularly supplying water by a heat supply network;
3-hydrophobic condensed water mechanism: 31-normal hydrophobic tube; 32-critical hydrophobic output pipe; 33-heat network emergency drainage flash tank; 34-a condensate pump; 35-cooling water; 36-drainage pipe network.
4-original heat supply network head station; 41-primary heat supply network head station steam extrusion; 42-primary heat supply network first station circulating backwater; 43-Primary heat net initial station heater.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic structural diagram of a cascade energy utilization system of a steam turbine at a head station of a heat supply network is shown.
The application provides a heat supply network head station steam turbine energy ladder utilizes system, including steam mechanism, heat supply network circulating water mechanism and hydrophobic condensate water mechanism.
As shown in fig. 1, specifically:
the steam mechanism comprises a steam turbine set 11, a heat supply network first-stage steam turbine 12 and a heat supply network heater 13, wherein the steam turbine set 11 is provided with a heating pipeline, and the heating pipeline is connected to the heat supply network first-stage steam turbine 12; the output end of the heat supply network head station steam turbine 12 is provided with a steam extraction pipeline and a steam exhaust pipeline, the steam extraction pipeline is connected to the heat supply network heater 13, the steam exhaust pipeline is connected to the input end of the high back pressure condenser 21, and the heat supply network head station steam turbine 12 is connected with a generator 15;
the heat supply network circulating water mechanism comprises a high back pressure condenser 21, a heat supply network circulating water return 25 is connected to the high back pressure condenser 21, the output end of the high back pressure condenser 21 is connected with the input end of a heat supply network heater 13, and the heat supply network heater 13 is connected to a heat supply network circulating water supply 26;
the drainage condensate mechanism comprises a normal drain pipe 31, an emergency drain output pipe 32 and a heat supply network emergency drain flash tank 33, the output end of the normal drain pipe 31 is connected with a heat supply network heater 13, the input end is connected with a condensate tank of a high-back-pressure condenser 21, the condensate tank of the high-back-pressure condenser 21 is connected to a heat well 14 of the turbine unit 11, the output end of the emergency drain output pipe 32 is connected with the heat supply network heater 13, the input end of the emergency drain output pipe is connected with the heat supply network emergency drain flash tank 33, the output end of the heat supply network emergency drain flash tank 33 is connected with a drainage pipe and the drainage pipe is connected to a drainage pipe network 36, and cooling water 35 is.
The steam turbine set 11 of this embodiment is specifically a 660MW steam turbine set 11.
The high back pressure condenser 21 is connected with the hot well 14 through a condensate pipe, a shaft seal heater 22 is arranged on the condensate pipe, and a condensate pump 34 is arranged on the condensate pipe and is positioned between the shaft seal heater 22 and the high back pressure condenser 21. The normal drainage of the heat supply network heater 13 enters the high back pressure condenser 21, and enters the condensate pump 34 for pressurization after being mixed with condensate water, the shaft seal leakage heat is recovered through the shaft seal heater 22, and then enters the steam exhaust device hot well 14 of the 660MW steam turbine unit 11, and the shaft seal heater 22 has the function of recovering the shaft seal leakage heat. The condensate pump 34 is used to pump the condensate in the pressurized high-back-pressure condenser 21.
The high-back-pressure condenser is characterized by further comprising a water filter 23, wherein the input end of the water filter 23 is connected with a first-station heat supply network circulating backwater 25, and the output end of the water filter 23 is connected with the high-back-pressure condenser 21. The water filter 23 is used for filtering impurities in the first-stage heat supply network circulating water return water 25 of the heat supply network, and the impurities in the first-stage heat supply network circulating water return water 25 of the heat supply network are prevented from entering the heat supply network circulation.
Wherein, the heat supply network heater 13 is connected with normal drain pipe 31 and critical drainage output tube 32, the normal drainage of heat supply network heater 13 gets into high back pressure condenser 21, and when the great water level of hydrophobic volume is higher, can discharge through critical drainage output tube 32, and heat supply network critical drainage flash tank 33 can carry out the dilatation decompression with critical drainage and discharge through drainage pipe again, simultaneously, because the critical drainage temperature of discharge is higher, so connect the cooling water on drainage pipe, the critical drainage reaches 40 ℃ probably after mixing with the cooling water, discharges again, the discharge gets into the drainage pipe network. The cooling water of the present embodiment comes from a cooling tower.
The connecting pipeline comprises two paths with different pipe diameters, namely a first connecting pipeline and a second connecting pipeline, the output end of the high-backpressure condenser 21 is connected with the input end of the heat supply network heater 13 through the first connecting pipeline, and the first connecting pipeline is connected with a heat supply network circulating pump 24.
The working principle of the embodiment is as follows: heating steam from a 660MW steam turbine unit 11 enters a heat supply network first-station steam turbine 12 through a heating pipeline, and extracted steam (high-pressure steam) from the heat supply network first-station steam turbine 12 enters a heat supply network heater 13 to be heated and directly enters a heat supply network first-station circulating water supply 26 to be heated; the heat supply network circulating backwater 25 is filtered by a water filter 23 and enters a high back pressure condenser 21, exhaust steam (low-pressure steam) from a steam turbine 12 at a heat supply network initial station enters the high back pressure condenser 21 and carries out primary heating on the circulating backwater entering the high back pressure condenser 21, then enters a heat supply network heater 13 through a first connecting pipeline and a heat supply network circulating pump 24 to carry out secondary heating, and then enters the heat supply network initial station for circulating water supply for heating; the normal drainage of the heat supply network heater 13 enters the high back pressure condenser 21, is mixed with the condensed water of the high back pressure condenser 21 and then enters the condensed water pump 34 for pressurization, and the shaft seal leakage heat is recovered by the shaft seal heater 22 and then enters the hot well 14; the emergency drainage of the heat supply network heater 13 enters the heat supply network emergency flash tank for expansion and pressure reduction and then is discharged through a drainage pipeline.
In the embodiment, the pressure reducer is replaced by the heat supply network initial-station steam turbine 12, the pressure difference energy is fully utilized, the generated energy is increased, the station service power is reduced, meanwhile, the heat supply network circulating water return 25 is subjected to primary heating in the high-backpressure condenser 21, the low-quality heat of the exhausted steam is fully utilized, and the energy utilization efficiency is improved.
Meanwhile, as shown in fig. 2, the system further comprises a heater at the primary heat supply network station, and the output end of the high back pressure condenser 21 is connected with the heater at the primary heat supply network station through a second connecting pipeline; the extrusion steam 41 of the original heat supply network first station is connected to the heat supply network heater 13, and the heat supply network circulating backwater 42 of the original heat supply network first station is connected to the input end of the water filter 23.
Since the power plant of the embodiment has the original heat supply network head station, the circulating backwater of the original heat supply network head station is filtered by the water filter 23 and enters the high-back-pressure condenser 21, the exhaust steam (low-pressure steam) from the steam turbine 12 of the newly-built heat supply network head station enters the high-back-pressure condenser 21 and carries out primary heating on the circulating backwater 42 of the original heat supply network head station entering the high-back-pressure condenser 21, and then enters the heater of the original heat supply network head station through the second connecting pipeline to carry out secondary heating; and the original heat supply network first station extrusion steam 41 is connected to the heat supply network heater 13, so that the energy utilization efficiency is improved.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (9)
1. A heat supply network initial stage steam turbine energy ladder utilization system is characterized by comprising:
the steam mechanism comprises a steam turbine set, a heat supply network initial station steam turbine and a heat supply network heater, wherein the steam turbine set is provided with a heating pipeline, and the heating pipeline is connected to the heat supply network initial station steam turbine; the output end of the steam turbine at the first station of the heat supply network is provided with a steam extraction pipeline and a steam exhaust pipeline, and the steam extraction pipeline is connected to the heat supply network heater;
the heat supply network circulating water mechanism comprises a high-backpressure condenser, the exhaust pipeline is connected to the input end of the high-backpressure condenser, the heat supply network circulating backwater is connected to the high-backpressure condenser, the output end of the high-backpressure condenser is connected with the input end of the heat supply network heater, and the heat supply network heater is connected to the heat supply network circulating water supply;
the drainage condensed water mechanism comprises a normal drainage pipe, the output end of the normal drainage pipe is connected with the heat supply network heater, the input end of the normal drainage pipe is connected to the condensed water tank of the high-back-pressure condenser, and the condensed water tank of the high-back-pressure condenser is connected to the hot well of the turbine unit.
2. The heat supply network head steam turbine energy staging system of claim 1 wherein: the hydrophobic condensed water mechanism also comprises a critical hydrophobic output pipe connected to the heat supply network heater.
3. The heat supply network head steam turbine energy staging system of claim 2 wherein: hydrophobic condensation water mechanism still includes the hydrophobic flash tank of heat supply network emergency, the hydrophobic output tube of emergency is connected to the input of the hydrophobic flash tank of heat supply network emergency, the output of the hydrophobic flash tank of heat supply network emergency is connected with drainage pipe just drainage pipe is connected to drainage pipe network.
4. The heat supply network head steam turbine energy staging system of claim 3 wherein: and cooling water is connected to the drainage pipeline.
5. The heat supply network head steam turbine energy staging system of claim 1 wherein: the high back pressure condenser is connected with the hot well through a condensate pipe, and a shaft seal heater is arranged on the condensate pipe.
6. The heat supply network head steam turbine energy staging system of claim 5 wherein: the high-back-pressure condenser is characterized by further comprising a condensate pump, wherein the condensate pump is arranged on the condensate pipe and is positioned between the shaft seal heater and the high-back-pressure condenser.
7. The heat supply network head steam turbine energy staging system of claim 1 wherein: the heat supply network circulating water mechanism further comprises a water filter, the input end of the water filter is connected with the heat supply network circulating water return water of the heat supply network initial station, and the output end of the water filter is connected to the high-backpressure condenser.
8. The heat supply network head steam turbine energy staging system of claim 7 wherein: the output end of the high back pressure condenser is connected with the input end of the heat supply network heater through a connecting pipeline, and the connecting pipeline is connected with a heat supply network circulating pump.
9. The heat supply network head steam turbine energy cascade utilization system according to any one of claims 1 to 8, wherein: and the steam turbine at the first station of the heat supply network is connected with a generator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020720197.7U CN212901675U (en) | 2020-05-06 | 2020-05-06 | Energy cascade utilization system for steam turbine at first station of heat supply network |
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| CN202020720197.7U CN212901675U (en) | 2020-05-06 | 2020-05-06 | Energy cascade utilization system for steam turbine at first station of heat supply network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941554A (en) * | 2022-05-09 | 2022-08-26 | 中国船舶重工集团公司第七0三研究所 | Energy cascade system for cogeneration of heating steam and utilization method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941554A (en) * | 2022-05-09 | 2022-08-26 | 中国船舶重工集团公司第七0三研究所 | Energy cascade system for cogeneration of heating steam and utilization method |
| CN114941554B (en) * | 2022-05-09 | 2023-09-08 | 中国船舶重工集团公司第七0三研究所 | Cascade system for heating steam to carry out heat and electricity combined energy and utilization method |
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