Turbine low-pressure heat supply recycling device

Abstract

The utility model relates to the field of steam turbines, and discloses a steam turbine low-pressure heat supply recycling device which comprises a heat recycling cover, the heat recycling cover is fixedly connected to the front side of a steam turbine body, a steam guide pipe is fixedly connected to the rear side of the steam turbine body, and a recycling assembly is arranged in the heat recycling cover. According to the steam turbine, through the arranged cyclic utilization assembly, in the working process of the steam turbine body, hot high-pressure steam is changed into a low-temperature-pressure state through the steam turbine and is led to a plurality of heat exchange pieces of the cyclic utilization assembly, and in the process that the high-pressure steam is led into the steam turbine body, part of the hot high-pressure steam is led into the annular pipe through the steam diversion pipe; under the action of hot high-pressure steam in the annular pipe, the temperature of the surfaces of the multiple heat exchange pieces is increased, after the heat exchange pieces are in contact in the low-temperature pressure state subsequently, the temperature of the steam is increased again, the steam passes through the steam return pipe and is converged into the steam turbine body through the steam guide pipe, and therefore the effect of low-pressure heat supply cyclic utilization is achieved.

Description

Technical Field

[0001] The utility model relates to the field of steam turbines, in particular to a low-pressure heat supply circulation utilization device for steam turbines. Background Art

[0002] A steam turbine is a device that converts the thermal energy of steam into mechanical energy, typically used to generate electricity or drive machinery. During turbine operation, high-pressure steam flows through a series of nozzles and moving blades, performing work. As the steam expands and works, its pressure and temperature decrease. With rising energy costs and increasing environmental protection requirements, improving energy efficiency and reducing emissions have become critical issues in the industrial sector. Therefore, effectively utilizing the low-pressure steam emitted by steam turbines has become a hot topic of research.

[0003] Currently, during the operation of a steam turbine, hot high-pressure steam becomes low-temperature, low-pressure steam after passing through the turbine to perform work. This steam is usually directly discharged or used for other inefficient purposes, resulting in energy waste. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the utility model provides a low-pressure heat supply circulation utilization device for a steam turbine, which solves the problem that the hot high-pressure steam of the steam turbine becomes low-temperature low-pressure steam after passing through the steam turbine to do work. This part of the steam is usually directly discharged or used for other inefficient purposes, resulting in energy waste.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-pressure heat supply circulation device for a steam turbine, comprising a heat circulation cover, the heat circulation cover is fixedly connected to the front side of the steam turbine body, the rear side of the steam turbine body is fixedly connected to a steam duct, a circulation component is arranged inside the heat circulation cover, the circulation component is used for circulating heat supply after low-pressure steam heating, the circulation component comprises a heat exchange plate, an annular tube, a connecting ring, a fixed plate, an axial flow fan, a rotating shaft and a conical guide tube, the connecting ring is fixedly connected to the front side of the heat circulation cover, a fixed plate is fixedly connected in the middle of the connecting ring, a plurality of heat exchange plates are arranged on the rear side of the fixed plate, the plurality of heat exchange plates are equidistantly distributed up and down, and an annular tube is arranged through the middle of the plurality of heat exchange plates, the outer side of the fixed plate is rotatably connected to the rotating shaft, and the outer surface of the rotating shaft is fixedly connected to the axial flow fan.

[0006] Preferably, a conical guide tube is fixedly connected to the outer side of the connecting ring, and a circulation pipe is connected to one end of the conical guide tube away from the connecting ring.

[0007] Preferably, one end of the circulation pipe away from the conical draft tube is connected to the upper surface of the steam conduit.

[0008] Preferably, a steam diversion pipe and a steam return pipe are connected to both sides of the upper end of the annular pipe respectively, and the ends of the steam diversion pipe and the steam return pipe away from the annular pipe are connected to both sides of the steam conduit respectively.

[0009] Preferably, a check valve is provided at the connection position between the steam reflux pipe and the steam conduit.

[0010] Preferably, the annular tube is made of copper.

[0011] Beneficial effects

[0012] The utility model provides a steam turbine low-pressure heat supply circulation device. Compared with the existing technology, it has the following advantages:

[0013] 1. In the present invention, by providing a recycling assembly, during operation of the steam turbine, hot high-pressure steam passes through the steam turbine to a low-temperature pressure state and flows into the multiple heat exchange fins of the recycling assembly. During the process of high-pressure steam flowing into the steam turbine, a portion of the hot high-pressure steam flows into the annular tube through the steam diversion pipe. Under the action of the hot high-pressure steam in the annular tube, the surface temperature of the multiple heat exchange fins increases. Subsequently, when the low-temperature pressure state contacts the heat exchange fins, the steam temperature is increased again and is re-entered into the steam turbine body through the steam return pipe and the steam conduit, thereby achieving the effect of low-pressure heat supply recycling.

[0014] 2. In the present invention, an axial flow fan is provided. When low-pressure steam is heated by the heat exchange plate and passes to the steam return pipe, the axial flow fan rotates under the action of the steam thrust. The rotation of the axial flow fan can increase the flow rate of the steam, thereby accelerating the steam to re-enter the turbine body. Due to the increase in the steam flow rate, the heat loss in the steam return pipe is reduced, ensuring that more heat energy is effectively utilized by the turbine body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the rear three-dimensional structure of a steam turbine low-pressure heat supply circulation device and a steam turbine body after assembly;

[0016] Figure 2 This is a schematic diagram of the front side three-dimensional structure of a steam turbine low-pressure heat supply circulation device and a steam turbine body after assembly according to the utility model;

[0017] Figure 3 This is a schematic diagram of the internal structure of a steam turbine low-pressure heat supply circulation device proposed in the utility model;

[0018] Figure 4 The utility model provides a schematic structural diagram of a recycling component in a steam turbine low-pressure heat supply recycling device.

[0019] Legend:

[0020] 1. Steam turbine body; 2. Heat recycling cover; 3. Circulation pipe; 4. Steam duct; 5. Steam diversion pipe; 6. Steam return pipe; 7. Circulation assembly; 701. Heat exchange fin; 702. Annular pipe; 703. Connecting ring; 704. Fixing plate; 705. Axial fan; 706. Rotating shaft; 707. Conical guide tube; 8. Check valve. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] See also Figures 1-4 , the utility model provides two technical solutions, specifically including the following embodiments:

[0023] Example 1:

[0024] A low-pressure heat supply and circulation device for a steam turbine includes a heat circulation cover 2, which is fixedly connected to the front side of a steam turbine body 1. A steam conduit 4 is fixedly connected to the rear side of the steam turbine body 1. A circulation component 7 is arranged inside the heat circulation cover 2. The circulation component 7 is used for circulating heat after low-pressure steam heating. The circulation component 7 includes a heat exchange plate 701, an annular tube 702, a connecting ring 703, a fixing plate 704, an axial flow fan 705, a rotating shaft 706 and a conical guide tube 707. The front end diameter of the conical guide tube 707 is smaller than the rear end diameter. The connecting ring 703 is fixedly connected to the front side of the heat circulation cover 2. A fixing plate 704 is fixedly connected in the middle of the connecting ring 703. A plurality of heat exchange plates 701 are arranged on the rear side of the fixing plate 704. The plurality of heat exchange plates 701 are equidistantly distributed up and down, and an annular tube 702 is arranged through the middle of the plurality of heat exchange plates 701. The annular tube 702 is made of copper.

[0025] During operation, when the turbine body 1 is working, the hot high-pressure steam is converted into a low-temperature pressure state through the turbine and is passed to the multiple heat exchange plates 701 of the recycling component 7. In the process of high-pressure steam passing into the turbine body 1, a part of the hot high-pressure steam passes through the steam diversion pipe 5 and passes into the annular pipe 702. Under the action of the hot high-pressure steam in the annular pipe 702, the surface temperature of the multiple heat exchange plates 701 increases. Subsequently, when the low-temperature pressure state contacts the heat exchange plates 701, the steam temperature is increased again, and is re-collected into the turbine body 1 through the steam reflux pipe 6 and the steam conduit 4, thereby achieving the effect of low-pressure heat supply and recycling.

[0026] Example 2:

[0027] On the basis of the first embodiment, the outer side of the fixed plate 704 is rotatably connected to a rotating shaft 706, and the outer surface of the rotating shaft 706 is fixedly connected to an axial flow fan 705. In the process of the low-temperature pressure steam being heated by the heat exchange plate 701 and passing to the steam return pipe 6, the axial flow fan 705 rotates under the action of the steam thrust. The rotation of the axial flow fan 705 can increase the flow rate of the steam, thereby accelerating the steam to re-enter the turbine body 1. Due to the increase in the steam flow rate, the heat loss in the steam return pipe 6 is reduced, ensuring that more heat energy is effectively utilized by the turbine body 1. A conical guide tube 707 is fixedly connected to the side, and the end of the conical guide tube 707 away from the connecting ring 703 is connected to the circulation pipe 3, and the end of the circulation pipe 3 away from the conical guide tube 707 is connected to the upper surface of the steam conduit 4. A check valve is provided at the connection position between the circulation pipe 3 and the steam conduit 4, which is not shown in the figure. The steam diversion pipe 5 and the steam return pipe 6 are respectively connected to the two sides of the upper end of the annular tube 702, and the steam diversion pipe 5 and the steam return pipe 6 are respectively connected to the two sides of the steam conduit 4 at one end away from the annular tube 702, and a check valve 8 is provided at the connection position between the steam return pipe 6 and the steam conduit 4.

[0028] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the application should be included in the scope of protection of the present application.

Claims

1. A steam turbine low-pressure heat supply and recycling device, comprising a heat recycling cover (2), characterized in that: The heat recycling cover (2) is fixedly connected to the front side of the steam turbine body (1), and a steam conduit (4) is fixedly connected to the rear side of the steam turbine body (1). A recycling assembly (7) is provided inside the heat recycling cover (2). The recycling assembly (7) is used for circulating heat after heating with low-pressure steam. The recycling assembly (7) includes a heat exchange plate (701), an annular tube (702), a connecting ring (703), a fixing plate (704), an axial fan (705), a rotating shaft (706), and a conical guide tube (707). The connecting ring (703) is fixedly connected to the front side of the heat recycling cover (2); a fixed plate (704) is fixedly connected in the middle of the connecting ring (703); a plurality of heat exchange fins (701) are arranged on the rear side of the fixed plate (704); the plurality of heat exchange fins (701) are evenly distributed up and down, and an annular tube (702) is provided through the middle of the plurality of heat exchange fins (701); a rotating shaft (706) is rotatably connected to the outer side of the fixed plate (704); an axial flow fan (705) is fixedly connected to the outer surface of the rotating shaft (706).

2. The steam turbine low-pressure heat supply cycle utilization device according to claim 1, characterized in that: A conical guide tube (707) is fixedly connected to the outside of the connecting ring (703), and one end of the conical guide tube (707) away from the connecting ring (703) is connected to a circulation pipe (3).

3. The steam turbine low-pressure heat supply cycle utilization device according to claim 2, characterized in that: One end of the circulation pipe (3) away from the conical draft tube (707) is connected to the upper surface of the steam conduit (4).

4. The steam turbine low-pressure heat supply cycle utilization device according to claim 1, characterized in that: The upper ends of the annular tube (702) are respectively connected to a steam diversion pipe (5) and a steam return pipe (6), and the ends of the steam diversion pipe (5) and the steam return pipe (6) away from the annular tube (702) are respectively connected to the two sides of the steam conduit (4).

5. The steam turbine low-pressure heat supply cycle utilization device according to claim 4, characterized in that: A check valve (8) is provided at the connection position between the steam return pipe (6) and the steam conduit (4).

6. The steam turbine low-pressure heat supply cycle utilization device according to claim 1, characterized in that: The annular tube (702) is made of copper.

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