Steam turbine-heat supply network heat exchange initial station integrated heat supply system

Abstract

The utility model discloses a steam turbine-heat supply network heat exchange initial station integrated heat supply system which is arranged in a steam turbine room and comprises a steam turbine located on the upper side of the interior of the steam turbine room; the heating network heater is arranged on the lower side of the steam turbine, a conical steam inlet chamber is arranged on the heating network heater and connected with a steam exhaust port of the steam turbine through a steam exhaust connecting pipe, and a subcooling heat exchanger is arranged outside the heating network heater and used for condensing condensed water of the heating network heater and reducing the temperature of the condensed water to the water temperature allowed by a condensate pump to operate; and the external pressure balance type expansion joint is arranged on the steam exhaust connecting pipe and is used for absorbing thermal expansion and balancing pipeline thrust. The heat supply system can improve the operation efficiency of the turboset, can greatly reduce the arrangement space, saves heat source pipelines and capital construction cost, and reduces the investment cost of a thermal power station.

Description

Technical Field

[0001] The present application relates to the technical field of heating systems, and in particular to a steam turbine-heat network heat exchange first station integrated heating system. Background Art

[0002] With the rapid economic development and the accelerated pace of urbanization, urban centralized heating has developed rapidly in recent years. Usually, the back pressure or extraction back steam turbine and the heat exchanger head station for cogeneration are arranged in two workshops, and the heat network heater is arranged in the heat exchanger head station. The turbine back pressure exhaust steam is used as the heat source of the heat network heater, which is transported to the heat exchanger head station through the exhaust steam pipeline and enters the heat network heater to heat the heat network return water.

[0003] The exhaust steam from the steam turbine is used as a heat source to be led to the heat exchanger station, and then enters the heat network heater to heat the heat network return water to a certain temperature for the secondary station or direct heat supply users. Usually, the steam turbine plant and the heat exchanger station are distributed in two plants, with long steam supply pipelines, large heat loss, and high investment and construction costs. The heat network heater, drain cooler, and condensate pump are arranged in the heat exchanger station, which has a large plant area, high capital construction costs, and the space below the steam turbine exhaust port is not fully utilized.

[0004] Therefore, in view of the above technical problems, how to improve heat exchange efficiency and reduce costs is a technical problem that technical personnel in this field need to solve. Utility Model Content

[0005] The purpose of this application is to provide a steam turbine-heat network heat exchange first station integrated heating system, which can improve the operating efficiency of the steam turbine unit, and can also greatly reduce the layout space, save heat source pipelines and infrastructure costs, and reduce the investment cost of thermal power plants.

[0006] To achieve the above-mentioned purpose, the present application provides a steam turbine-heat network heat exchange first station integrated heating system, which is arranged in a steam turbine room and includes:

[0007] A steam turbine, located at the upper side of the steam turbine room;

[0008] A heat network heater is arranged at the lower side of the steam turbine, and a conical steam inlet chamber is arranged on the heat network heater, and the conical steam inlet chamber is connected to the exhaust port of the steam turbine through an exhaust pipe. The heat network heater is externally provided with a cooling heat exchanger, and the cooling heat exchanger is used to condense the condensate of the heat network heater and reduce the condensate to a water temperature that allows the condensate pump to operate;

[0009] The external pressure balanced expansion joint is arranged on the exhaust pipe and is used to absorb thermal expansion and balance the thrust of the pipeline.

[0010] Preferably, a steam inlet is obliquely provided on the conical steam inlet chamber, and the steam inlet is connected to the steam exhaust pipe to increase the steam inlet space of the heat network heater and improve the uniform distribution of steam flow in the heat network heat exchanger.

[0011] Preferably, the condensation heat exchanger is fixedly arranged at the lower side of the heating network heater and is used to receive the condensed water of the heating network heater.

[0012] Preferably, part of the hot network return water of the hot network heater directly enters the hot network heater, and the other part enters the cooling heat exchanger to cool the condensed water, and then enters the hot network heater.

[0013] Preferably, the heat network return water is heated by the heat network heater and then discharged from the heat network heater to form heat network supply water.

[0014] Preferably, the outlet temperature of the cooled condensate is below 80° C., and is transported to the deaerator through the condensate pump.

[0015] Preferably, an electric butterfly valve is also provided on the exhaust pipe to control the on-off between the steam turbine and the heating network heater.

[0016] Preferably, the heating network heater is also provided with an exhaust port for exhausting the air inside the heater and a steam exhaust safety valve for safe pressure relief.

[0017] Compared with the above-mentioned background technology, the heating system of the present application is integrated in a turbine room, the steam turbine is arranged on the upper side of the turbine room, and the heat network heater is arranged at the lower part of the steam turbine, which is equivalent to the position of the condenser of the condensing steam turbine. The exhaust steam of the steam turbine directly enters the heat network heater through a shorter exhaust pipe. At the same time, since the exhaust pipe is short, it cannot absorb the axial displacement well and the thrust on the support of the heat network heater is large. For this reason, a straight pipe external pressure balanced expansion joint is designed according to the height and layout distance of the exhaust pipe, which can absorb the thermal displacement of the pipeline expansion and withstand the thrust generated by the internal pressure of the steam, thereby ensuring the safe operation of the heat network heater.

[0018] In addition, a conical steam inlet chamber is provided on the heat network heater, which is connected to the exhaust port of the steam turbine through an exhaust pipe, thereby increasing the steam inlet space and ensuring uniform distribution of steam flow. The heat network heater is equipped with an external cooling heat exchanger, which is used to condense the condensate of the heat network heater and reduce the condensate to a water temperature that allows the condensate pump to operate. At the same time, the cooling heat exchanger also acts as a water tank, which can adjust the condensate level to ensure safe operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a steam turbine-heat network heat exchange first station integrated heating system provided in an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of the heating network heater and the cooling heat exchanger provided in the embodiment of the present application.

[0022] In the figure: 1, steam turbine 2, exhaust pipe 3, external pressure balanced expansion joint 4, electric butterfly valve 5, exhaust port 6, exhaust safety valve 7, heating network heater 8, cooling heat exchanger 9, condensate pump 10, heating network return water 11, heating network water supply 12, conical steam inlet chamber 13, steam inlet. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] It should be noted that in this embodiment, the directions or positional relationships indicated by "upper", "lower", "front", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present application. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] like Figure 1As shown, in this embodiment, a steam turbine-heat exchange first station integrated heating system is provided, specifically a heating system integrating a steam turbine and a heat exchange first station of a heat network; the layout of the existing heating system usually adopts two plants, a steam turbine room and a heat exchange first station, with a long exhaust pipe, large exhaust loss, and low heat exchange efficiency; under the condition of meeting the same heat exchange effect, the exhaust pressure of steam turbine 1 is high and the power generation is small; and the high-temperature heat source pipeline is long, the two plants occupy a large space, and the infrastructure cost is high. The heating system of the present application is arranged as a whole in one machine room, which can greatly reduce the layout space, save the heat source pipeline and infrastructure cost, and reduce the investment cost of the thermal power station.

[0027] Please refer to Figure 1 The steam turbine 1 is located at the upper side of the machine room. In order to make full use of the lower space of the steam turbine 1, the heat network heater 7 is arranged at the lower part of the steam turbine 1, which is equivalent to the condenser position of the condensing steam turbine 1. The exhaust steam of the steam turbine 1 directly enters the heat network heater 7 through the shorter exhaust pipe 2.

[0028] To improve the efficiency of the heating network heater 7, please refer to Figure 2 A conical steam inlet chamber 12 is provided on the heat network heater 7, and a steam inlet port 13 is obliquely provided on the conical steam inlet chamber 12. The steam inlet port 13 is connected to the exhaust port of the steam turbine 1 through the exhaust pipe 2, so as to increase the steam inlet space of the heat network heater 7 and improve the uniform distribution of the steam flow in the heat network heat exchanger.

[0029] It should be noted that a plurality of steam inlets 13 at different positions can be provided on the heat network heater 7 and the conical steam inlet chamber 12, so as to greatly improve the steam inlet effect, ensure the uniform distribution of the steam flow, and improve the heat exchange effect.

[0030] The heat exchanger of the heating network adopts an external cooling heat exchanger 8, which is fixedly arranged at the lower side of the heating network heater 7 and can receive the condensed water generated by the heating network heater 7. The condensed water is reduced to the water temperature range allowed by the condensate pump 9. At the same time, the cooling heat exchanger 8 also acts as a water tank, which can adjust the condensed water level to ensure the safe operation of the equipment.

[0031] The condensate pump 9 can be placed in a pit at the bottom of the heating network heater 7 according to the NPSH and layout space, without increasing the height of the plant.

[0032] In order to balance the thermal expansion and thrust between the steam turbine 1 and the heating network heater 7, an external pressure balance expansion joint 3 is added to the exhaust pipe 2, which can effectively absorb the thermal displacement of the pipeline expansion and withstand the thrust generated by the internal pressure of the steam. As for the specific specifications of the expansion joint, they can be selected according to the actual conditions such as the height and layout distance of the exhaust pipe 2, and will not be described in detail.

[0033] In summary of the above embodiments, each device in the heating system of the present application is arranged in a steam turbine room, the steam turbine 1 is arranged on the upper side of the steam turbine room, the heat network heater 7 is arranged at the lower part of the steam turbine 1, which is equivalent to the position of the condenser of the condensing steam turbine 1, and the exhaust steam of the steam turbine 1 directly enters the heat network heater 7 through the shorter exhaust pipe 2; at the same time, since the exhaust pipe 2 is short, it cannot absorb the axial displacement well and the thrust on the support of the heat network heater 7 is large. For this reason, according to the height and arrangement distance of the exhaust pipe 2, a straight pipe external pressure balance type expansion joint 3 is designed, which can absorb the thermal displacement of the pipeline expansion and withstand the thrust generated by the internal pressure of the steam, so as to ensure the safe operation of the heat network heater 7. In addition, a conical steam inlet chamber 12 is arranged on the heat network heater 7, and the conical steam inlet chamber 12 is connected to the exhaust port of the steam turbine 1 through the exhaust pipe 2, so as to increase the steam inlet space and ensure the uniform distribution of the steam flow. The heat network heater 7 is equipped with an external cooling heat exchanger 8, which is used to condense the condensate of the heat network heater 7 and reduce the condensate to a water temperature that the condensate pump 9 is allowed to operate. At the same time, the cooling heat exchanger 8 also acts as a water tank, which can adjust the condensate level to ensure safe operation of the equipment.

[0034] Please refer to Figure 1 Part of the hot network return water 10 of the hot network heater 7 directly enters the hot network heater 7, and the other part enters the cooling heat exchanger 8 to cool the condensate, and then enters the hot network heater 7. Among them, the outlet temperature of the cooled condensate is below 80°C, and is transported to the deaerator through the condensate pump 9; and the hot network return water 10 or the water inside the hot network heater 7 is heated and discharged to form the hot network supply water 11, which is supplied to the secondary station or heat users.

[0035] In addition, other control valves such as an electric butterfly valve 4 are also provided on the exhaust pipe 2, which can ensure that the steam turbine 1 and the heating network heater 7 are shut off during the maintenance process, so as to facilitate the maintenance. After the maintenance is completed, the steam turbine 1 is connected to the heating network heater 7 and operates normally; the heating network heater 7 is also provided with an exhaust port 5 for exhausting the air inside it and an exhaust safety valve 6 for safe pressure relief. As for the specific setting method, reference can be made to the prior art, which will not be repeated here.

[0036] In general, the steam turbine 1, exhaust pipe 2, external pressure balanced expansion joint 3, electric butterfly valve 4, heat network heater 7, cooling heat exchanger 8 and condensate pump 9 of the heating system are all arranged in one machine room. Under the premise of this arrangement, the exhaust pipe 2 is shorter and the heat loss is small. The exhaust pressure of the steam turbine 1 is lower than that of the steam turbine-heating first station split arrangement, meeting the same outlet water temperature; that is, under the condition of a certain heat exchange amount, the steam consumption of the steam turbine 1 is low; if the steam inlet volume is constant and the exhaust pressure is constant, the integrated arrangement has small heat loss and large heat release, and under the condition of the same water volume, the outlet water temperature is high.

[0037] At present, according to the user's requirements for outlet water temperature of 90℃, 100℃, and 120℃, the exhaust pressure of turbine 1 is designed to be 0.112Mpa, 0.196Mpa, 0.294Mpa and other models. The actual operating pressure is lower than the design pressure and the thermal efficiency is high.

[0038] The present application adopts an integrated layout, that is, the heating system is arranged in one machine room, which can make full use of the space below the exhaust port of the steam turbine 1, greatly shorten the length of the heat source steam supply pipeline of the heat network, and reduce the layout cost and plant infrastructure cost; at the same time, the external cooling heat exchanger 8 and the heat network heater 7 are integrated into a design, which can not only meet the cooling of the condensate water, but also play a role in regulating the liquid level of the water tank, thereby ensuring the normal operation of the condensate pump, and has the advantages of high heat exchange efficiency and low use cost.

[0039] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0040] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A steam turbine-heat network heat exchange first station integrated heating system, characterized in that: Installed in the turbine room, including: A steam turbine, located at the upper side of the steam turbine room; A heat network heater is arranged at the lower side of the steam turbine, and a conical steam inlet chamber is arranged on the heat network heater, and the conical steam inlet chamber is connected to the exhaust port of the steam turbine through an exhaust pipe. The heat network heater is externally provided with a cooling heat exchanger, and the cooling heat exchanger is used to condense the condensate of the heat network heater and reduce the condensate to a water temperature that allows the condensate pump to operate; The external pressure balanced expansion joint is arranged on the exhaust pipe and is used to absorb thermal expansion and balance the thrust of the pipeline.

2. The steam turbine-heat network heat exchange first station integrated heating system according to claim 1 is characterized in that: A steam inlet is obliquely arranged on the conical steam inlet chamber, and the steam inlet is connected to the exhaust pipe to increase the steam inlet space of the heating network heater and improve the uniform distribution of the steam flow in the heating network heater.

3. The steam turbine-heat network heat exchange first station integrated heating system according to claim 1 is characterized in that: The cooling heat exchanger is fixedly arranged at the lower side of the heating network heater and is used to receive the condensed water of the heating network heater.

4. The steam turbine-heat network heat exchange first station integrated heating system according to claim 1 is characterized in that: A part of the hot network return water of the hot network heater directly enters the hot network heater, and the other part enters the cooling heat exchanger to cool the condensed water, and then enters the hot network heater.

5. The steam turbine-heat network heat exchange first station integrated heating system according to claim 4 is characterized in that: The heat network return water is heated by the heat network heater and then discharged from the heat network heater to form heat network supply water.

6. The steam turbine-heat network heat exchange first station integrated heating system according to claim 4 is characterized in that: The outlet temperature of the cooled condensate is below 80° C. and is transported to the deaerator through the condensate pump.

7. The steam turbine-heat network heat exchange first station integrated heating system according to claim 1 is characterized in that: The exhaust pipe is also provided with an electric butterfly valve to control the connection between the steam turbine and the heating network heater.

8. The steam turbine-heat network heat exchange first station integrated heating system according to claim 1, characterized in that: The heating network heater is also provided with an exhaust port for exhausting the air inside the heater and a steam exhaust safety valve for safe pressure relief.

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