Thermodynamic system for steam turbine low-pressure cylinder exhaust steam waste heat recovery

Abstract

The invention is applicable to the technical field of waste heat recovery systems, and provides a thermodynamic system for steam turbine low-pressure cylinder exhaust steam waste heat recovery, which comprises a pipeline, a filter plate for filtering is mounted in the pipeline, a rotating shaft is arranged on one side, facing the water flow direction, of the filter plate, and a scraper in contact with the inner wall of the pipeline is arranged on the outer surface of the rotating shaft. A control shell is arranged on the top wall of the pipeline, the control shell is located on the side, opposite to the water flow direction, of the filter plate, and the end, close to the control shell, of the rotating shaft rotationally penetrates out of the filter plate and rotationally penetrates into the control shell. In the using process, an opening does not need to be formed in the pipeline, the workload of workers is reduced, the cleaning efficiency and speed of the pipeline of the waste heat recovery system are improved, and the operation efficiency of the waste heat recovery system is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery systems, and more specifically, to a thermal system for recovering waste heat from exhaust of a low-pressure cylinder of a steam turbine. Background Art

[0002] In the current thermal cycle, the large latent heat of vaporization of the exhaust steam from the low-pressure cylinder of the steam turbine is carried into the cooling tower by the circulating water and wasted during liquefaction. Therefore, a thermal system that recovers the exhaust heat of a high-power heat pump has been designed, such as a screw heat pump unit (hereinafter referred to as a "heat pump"). This unit can obtain heat from a low-temperature heat source and output high-temperature hot water while consuming less electricity, thereby achieving the purpose of recovering low-temperature waste heat.

[0003] The existing waste heat recovery thermal system generally transports water through pipes when in use. However, after the existing water passes through the condenser, cooling tower and other links, a certain amount of impurities will be generated in the water due to the continuous heating and cooling of the water. In order to ensure the stable operation of the waste heat recovery thermal system, a filter plate is generally installed in the pipe to filter the water. However, after the impurities in the water are filtered, they are generally accumulated on the filter plate. If the impurities on the filter plate are not cleaned for a long time, the fluidity of the entire pipeline of the waste heat recovery thermal system will be affected. Most of the existing methods for cleaning impurities inside the pipeline are generally to open an opening in the pipeline. When it is necessary to clean the impurities, the opening is opened and the impurities on the filter plate are cleaned. This method increases the workload of the staff and increases the time for cleaning the pipeline of the waste heat recovery thermal system, affecting the efficiency of the operation of the waste heat recovery thermal system. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine.

[0005] To achieve the above object, the present invention provides the following technical solutions: A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine, comprising a heat pump unit, a condenser, a low-pressure heating system, a heat pump circulating pump, a heat pump external heat exchanger, a condensate pump, a circulating water pump, a cooling tower, a heat pump, a plurality of pipes for connection, and valves VA1, VA2, VA3, VA4, VA5, VB1, VB2, VC1, and VC2. A filter plate for filtering is installed in the pipes near the output ends of the cooling tower, the heat pump unit, the condenser, and the heat pump external heat exchanger. A rotating shaft is arranged on the side of the filter plate facing the water flow direction, and a scraper contacting the inner wall of the pipe is arranged on the outer surface of the rotating shaft. A control housing is arranged on the top wall of the pipe, and the control housing is located on the side of the filter plate facing away from the water flow direction. The end of the rotating shaft near the control housing rotates through the filter plate and rotates through the control housing. The outer surface of the rotating shaft is provided with a collecting assembly, which is arranged on the side of the filter plate facing away from the control shell. The collecting assembly includes a collecting rod, which is arranged on the outer surface of the rotating shaft. The outer surface of the collecting rod close to the filter plate is provided with a first brush for cleaning the surface of the filter plate. The other end of the collecting rod is provided with a collecting shell that fits the inner wall of the pipeline. The collecting shell also fits the surface of the filter plate. A feed groove connected to the interior of the collecting shell is provided on the surface of the collecting shell. The feed groove is arranged on the side of the collecting shell away from the collecting rod. The feed groove is located in the direction of rotation of the rotating shaft. The collecting shell A plurality of water outlet holes connected to the interior of the feed trough are provided on the surface of the side away from the feed trough. The interior of the collecting rod is hollow and connected to the interior of the collecting shell. A discharge trough connected to the interior of the control shell is provided in the rotating shaft, and the discharge trough is trumpet-shaped. The top of the collecting rod is connected to the discharge trough. The lower side of the control shell passes through the lower surface of the outlet pipe. A connecting pipe head connected to the interior of the control shell is provided on the lower side of the control shell. A sealing mechanism for sealing the feed trough and the water outlet respectively is provided on the collecting shell. A cleaning mechanism for cleaning the water outlet is provided inside the collecting shell near the water outlet.

[0006] The present invention is further configured as follows: two pipes forming a loop are arranged between the output and input ends of the condenser and the input and output ends of the cooling tower, a circulating water pump is arranged at a section of the pipe close to the output end of the cooling tower, a pipe for installing a heat pump external heat exchanger is arranged between the pipes of the two loops, valves VC1 and VC2 are arranged on both sides of the heat pump external heat exchanger, the heat pump circulating pump and the condensate pump are respectively connected to the output end of the bottom of the condenser, two pipes are also arranged between the heat pump circulating pump and the condensate pump and the input end of the heat pump unit, valves VA3 and VA4 are both arranged on the pipe connected to the condensate pump, and valve VA5 is arranged on the pipe connected to the heat pump circulating pump. A pipeline connected to the heat pump unit is also provided between the output end of the heat pump unit and the low-temperature heating system. Valve VA2 is provided on the pipeline between the heat pump unit and the low-temperature heating system, and a pipeline connecting the pipeline and the pipeline connected to the condensate pump is provided between the two. Valve VA1 is provided on the pipeline. A pipeline connected to the input end of the condenser is provided between the heat pump external heat exchanger and the heat pump unit. Valve VB1 is provided on a section of the pipeline close to the heat pump external heat exchanger. Valve VA5 is provided on a section of the pipeline close to the condenser. A pipeline is also provided between the pipeline connected to the heat pump circulating pump and the input end of the heat pump external heat exchanger. Valve VB2 is provided on the pipeline.

[0007] The present invention is further configured as follows: a first bevel gear is sleeved on the outer surface of one end of the rotating shaft located in the control housing, a second bevel gear is meshedly connected to the upper side of the first bevel gear, a motor is arranged on the outer surface of the pipeline, the lower end of the motor output shaft rotates and penetrates into the control housing and is connected to the upper surface of the second bevel gear.

[0008] The present invention is further configured as follows: the sealing mechanism includes two movable shells, one movable shell is arranged on the inner wall of the collecting shell near the feed trough, and the other movable shell is arranged on the outer surface of the collecting shell near the water outlet. A sealing plate is arranged in the movable shell, and one side of the sealing plate slides through the outer surface of the movable shell. The sealing plate is located on the side outside the movable shell and can seal the feed trough, and the sealing plate on the side close to the water outlet can seal the water outlet. An installation shaft is rotatably connected to the inner wall of the collecting shell, and a gear is sleeved on the outer surface of the installation shaft. A tooth groove meshing with the gear is opened on the surface of the sealing plate on one side close to the gear, and a control pull plate is arranged on the other side of the gear. The other side of the control pull plate slides through the surface of the movable shell near the collecting rod, and the surface of the control pull plate close to the gear is also provided with a tooth groove meshing with the gear. A spring is arranged between the installation shaft and the inner wall of the movable shell.

[0009] The present invention is further configured as follows: a sealing rubber pad is provided on the inner wall of the collection shell close to the feed trough and the outer surface close to the water outlet.

[0010] The present invention is further configured as follows: a sealing ball for sealing the collecting rod is arranged in the discharge trough, and a sealing rubber is sleeved on the outer surface of the sealing ball to increase the sealing between the sealing ball and the collecting rod; a pulling rod is arranged on the outer surface of the sealing ball located in the collecting rod, and a pulling plate is arranged at the other end of the pulling rod, and a knocking mechanism for knocking the inner wall of the collecting rod is arranged between the pulling rod and the pulling plate, and two pulling ropes are arranged on the surface of the pulling plate facing away from the pulling rod, wherein the other end of one of the pulling ropes extends into the collecting shell and is connected to the control pull plate close to the feed trough, and the other pulling rope slides through the outer surface of the collecting rod and is connected to the control pull plate close to the water outlet.

[0011] The present invention is further configured as follows: the knocking mechanism includes a twisted rod, one end of the twisted rod is rotatably connected to the surface of the pulling rod away from the blocking ball, the other end of the twisted rod is provided with a rotating shaft, the other end of the rotating shaft is rotatably connected to the pulling plate, a twisted sleeve spirally sleeved on the outer surface of the twisted rod is provided on the inner wall of the collecting rod close to the feed trough, the outer surface rotating sleeve of the rotating shaft is provided with a rotating ring, and a first spring movably sleeved on the outer surface of the twisted rod is provided between the rotating ring and the twisted sleeve.

[0012] The present invention is further configured as follows: an n-shaped frame is provided on the inner wall of the collecting rod, a sliding sleeve is provided on the vertical plate of the n-shaped frame with an impact rod for knocking the inner wall of the collecting rod, a contact plate is provided at one end of the impact rod close to the rotating shaft, a second spring movably sleeved on the outer surface of the impact rod is provided between the contact plate and the n-shaped frame, and a cam contacting the outer surface of the contact plate is provided on the outer surface of the rotating shaft.

[0013] The present invention is further configured as follows: the cleaning mechanism includes a mounting plate, the mounting plate is arranged on the bottom wall of the collection shell, the side of the mounting plate is rotatably connected to a rotating disk, and the outer surface of the rotating disk is provided with a plurality of fan blades arranged in a circular array.

[0014] The present invention is further configured as follows: an inclined mounting rod is provided on the bottom wall of the collecting shell near the water outlet, a sliding sleeve is provided on the outer surface of the inclined mounting rod, a second brush for cleaning the water outlet is provided on the surface of the sliding sleeve facing the water outlet, an L-shaped rod is provided on the surface of the sliding sleeve facing away from the water outlet, and a toggle rod is provided on the outer surface of the rotating disk, the other end of which contacts the cross bar of the L-shaped rod.

[0015] The advantages of the present invention are: First, the present invention can automatically clean and collect impurities blocked by the filter plate. During use, there is no need to set an opening on the pipeline, which reduces the workload of the staff, improves the efficiency and speed of cleaning the waste heat recovery system pipeline, and ensures the efficiency of the operation of the waste heat recovery system.

[0016] Secondly, the present invention is provided with a sealing mechanism, which can automatically open and close the feed trough, the water outlet and the collecting rod during the rotation of the collection shell. No human control is required. It is completely based on the linkage of the mechanical structure and has high stability and accuracy. Excessive water in the pipeline will not be discharged through the discharge trough, thereby ensuring the stability of the waste heat recovery system pipeline during operation.

[0017] Thirdly, the present invention is provided with a knocking mechanism, so that when the impurities in the collection shell flow into the discharge trough, the inner wall of the collection rod can be automatically knocked, causing the inner wall of the collection rod to vibrate, so that the impurities attached to the inner wall of the collection rod can slide better into the discharge trough, avoiding excessive impurities adhering to the inner wall of the collection rod as much as possible, and further ensuring the collection effect and efficiency of impurities.

[0018] Fourthly, the present invention is provided with a cleaning mechanism, which can control the second brush to clean the water outlet up and down back and forth, thereby avoiding the situation where too many impurities block the water outlet, ensuring the water permeability of the water outlet and the collection effect of the collection shell on impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a block diagram of a thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to the present invention; Figure 2 It is a schematic diagram of the connection structure of the pipeline of the present invention; Figure 3 It is a schematic cross-sectional view of the pipeline of the present invention; Figure 4 It is a side plan view of the internal structure of the collecting rod, the collecting shell and the rotating shaft of the present invention; Figure 5for Figure 4 Enlarged view of point A in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle; Figure 7 It is a cross-sectional schematic diagram of the control housing and the rotating shaft of the present invention; Figure 8 for Figure 5 Enlarged view of center C.

[0020] In the figure: 1, pipeline; 2, filter plate; 3, rotating shaft; 4, scraper; 5, control housing; 6, first bevel gear; 7, second bevel gear; 8, motor; 9. Collection assembly; 91. Collection rod; 92. Collection shell; 93. First brush; 94. Feed trough; 95. Water outlet; 951. Mounting plate; 952. Rotating disk; 953. Fan blade; 954. Mounting inclined rod; 955. Sliding sleeve; 956. Second brush; 957. L-shaped rod; 958. Toggle rod; 96, blocking mechanism; 961, blocking ball; 962, pulling rod; 963, sealing rubber; 964, striking mechanism; 9641, twist rod; 9642, twist sleeve; 9643, rotating ring; 9644, rotating shaft; 9645, first spring; 9646, cam; 9647, n-type frame; 9648, impact rod; 9649, contact plate; 96410, second spring.

[0021] 965, pulling plate; 966, pulling rope; 967, movable shell; 968, blocking plate; 969, mounting shaft; 9610, gear; 9611, tooth groove; 9612, control pulling plate; 9613, spring; 10. Discharge chute; 11. Connecting pipe head. DETAILED DESCRIPTION

[0022] See also Figure 1-8 , the present invention provides the following technical solutions: Specifically, it refers to a thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine, comprising a heat pump unit, a condenser, a low-pressure heating system, a heat pump circulating pump, a heat pump external heat exchanger, a condensate pump, a circulating water pump, a cooling tower, a shaft heating system, a plurality of pipes 1 for connection and valves VA1, VA2, VA3, VA4, VA5, VB1, VB2, VC1 and VC2. Two pipes 1 forming a loop are arranged between the output and input ends of the condenser and the input and output ends of the cooling tower. The circulating water pump is arranged at a section of the pipe 1 close to the output end of the cooling tower. A pipe 1 for installing a heat pump external heat exchanger is arranged between the pipes 1 of the two loops. Valves VC1 and VC2 are arranged on both sides of the heat pump external heat exchanger. The heat pump circulating pump and the condensate pump are respectively connected to the output end at the bottom of the condenser. The heat pump circulating pump and the condensate pump are connected to the input end of the heat pump unit. Two pipelines 1 are also set up between the heat pump unit and the low-temperature heating system. Valve VA3 and shaft heating are both set on the pipeline 1 connected to the condensate pump. Valve VA4 is set on the pipeline 1 connected to the heat pump circulation pump. Pipeline 1 is also set between the output end of the heat pump unit and the low-temperature heating system. Valve VA2 is set on the pipeline 1 between the heat pump unit and the low-temperature heating system, and a pipeline connecting the pipeline 1 and the pipeline 1 connected to the condensate pump is set between the two. Valve VA1 is set on the pipeline. Pipeline 1 connected to the condenser input end is set between the heat pump external heat exchanger and the heat pump unit. Valve VB1 is set on a section of the pipeline 1 close to the heat pump external heat exchanger. Valve VA5 is set on a section of the pipeline 1 close to the condenser. Pipeline 1 is also set between the pipeline 1 connected to the heat pump circulation pump and the input end of the heat pump external heat exchanger. Valve VB2 is set on the pipeline 1.

[0023] The condenser is divided into two working areas, one part is the "circulating water pump - condenser - cooling tower" circuit (referred to as "circulation 1, the same below, at this time the condenser working area is the middle and upper area), the other part is the "circulating water pump - valve VC2 - heat pump external heat exchanger - valve VC1 - cooling tower" circuit (referred to as "circulation 2, the same below, at this time the condenser working area is the middle and lower area).

[0024] Heat pump operation conditions: 1. Open valves VA3 and VA2, and close valve VA1. At this time, the condensate enters the low-pressure heating system through the heat pump unit; 2. Open valves VA4 and VB5, and close valves VB1 and VB2. At this time, the circulating water in the condenser pipe absorbs the exhaust heat of the low-pressure cylinder of the steam turbine, and part of it enters the heat pump through the heat pump circulation pump as the low-temperature heat source of the heat pump; the heat that the heat pump cannot absorb still enters the cooling tower through "loop 1" for cooling; 3. Start the heat pump to transfer the latent heat of vaporization absorbed from the condenser to the condensate system.

[0025] Heat pump exit condition: 1. Stop the heat pump, open valves VB1, VB1, and close valves VA4, VA5. At this time, the circulating water in the condenser pipeline absorbs the exhaust heat of the low-pressure cylinder of the steam turbine. Part of it is circulated and cooled through the heat pump external heat exchanger, and the other part enters the cooling tower for cooling. The heat generated by the external heat exchanger is cooled by the circulating water passing through "loop 2"; 2. Open valve VA1 and close valves VA2 and VA3 to exit the heat pump operation.

[0026] Taking TMCR working condition as an example, the condensate temperature is 34.3 degrees [steam turbine thermal calculation], and the temperature rise after the steam seal heater is 2 degrees [on-site measurement point]. At this time, the condensate temperature after the steam seal heater is about 36.3 degrees. The hot water temperature output by the heat pump can generally reach up to about 80 degrees, so it is completely feasible to use the heat output by the heat pump to heat the condensate after the steam seal heater.

[0027] According to the above, the condenser is divided into two areas according to the capacity of the heat pump. The working medium of one area is external circulating water, and the working medium of the other area is closed circulating water of the heat pump unit. In the system using closed circulating water, the purpose of recycling the exhaust heat of the low-pressure cylinder of the turbine is achieved.

[0028] A filter plate 2 for filtering is installed in the pipe 1, and a rotating shaft 3 is provided on the side of the filter plate 2 facing the water flow direction. A scraper 4 in contact with the inner wall of the pipe 1 is provided on the outer surface of the rotating shaft 3. A control housing 5 is provided on the top wall of the pipe 1. The control housing 5 is located on the side of the filter plate 2 facing away from the water flow direction. The end of the rotating shaft 3 close to the control housing 5 rotates to pass through the filter plate 2 and rotates to pass through the control housing 5. The outer surface of the end of the rotating shaft 3 located in the control housing 5 is sleeved with a first bevel gear 6, and the upper side of the first bevel gear 6 is meshed and connected with a second bevel gear 7. A motor 8 is provided on the outer surface of the pipe 1, and the lower end of the output shaft of the motor 8 rotates to pass through the control housing 5. The first bevel gear 6 rotates synchronously under the meshing transmission of the second bevel gear 7, so that the rotating shaft 3 drives the scraper 4 to rotate in the pipeline 1, so the scraper 4 can scrape off the impurities attached to the inner wall of the pipeline 1, ensuring the cleanliness of the inner wall of the pipeline 1. At the same time, the above structure is arranged on the side of the pipeline 1 close to the outlet of the heat pump unit, condenser, cooling tower and the external heat exchanger of the heat pump, so the impurities in the water will be blocked at the outlet of the equipment, and these impurities are avoided as much as possible from flowing into the pipeline of the entire exhaust steam waste heat recovery system.

[0029] A collecting assembly 9 is provided on the outer surface of the rotating shaft 3. The collecting assembly 9 is arranged on the side of the filter plate 2 facing away from the control shell 5. The collecting assembly 9 includes a collecting rod 91. The collecting rod 91 is arranged on the outer surface of the rotating shaft 3. The collecting rod 91 is provided with a first brush 93 for cleaning the surface of the filter plate 2 near the outer surface of the filter plate 2. The other end of the collecting rod 91 is provided with a collecting shell 92 that is in contact with the inner wall of the pipeline 1. At the same time, the collecting shell 92 is also in contact with the surface of the filter plate 2. A feeding groove 94 connected to the interior of the collecting shell 92 is opened on the surface of the collecting shell 92. The feeding groove 94 is arranged on the side of the collecting shell 92 away from the collecting rod 91. The feeding groove 94 is located in the direction of rotation of the rotating shaft 3. For example, when the rotating shaft 3 rotates clockwise, the feeding groove 94 is opened on the front side of the collecting shell 92, and vice versa. When the collecting shell 92 rotates synchronously with the rotating shaft 3, the impurities accumulated near the filter plate 2 enter the collecting shell 92 through the feeding groove 94, thereby achieving the purpose of collecting the impurities blocked by the filter plate 2.

[0030] A plurality of water outlet holes 95 are provided on the surface of one side of the collecting shell 92 away from the feeding trough 94 and are connected to the interior thereof. Therefore, when the collecting shell 92 rotates synchronously with the rotating shaft 3, the water entering the collecting shell 92 can flow out through the water outlet holes 95 to form a water flow, and the water outlet holes 95 block the impurities in the collecting shell 92. In this way, when cleaning the impurities close to the side of the filter plate 2, the impurities can be better entered into the collecting shell 92 with the water flow, and the situation in which the impurities cannot enter the collecting shell 92 after the collecting shell 92 is filled with water is avoided as much as possible, thereby ensuring the collection effect of the impurities.

[0031] The interior of the collecting rod 91 is hollow and communicated with the interior of the collecting shell 92. A discharge trough 10 communicated with the interior of the control shell 5 is provided in the rotating shaft 3, and the discharge trough 10 is trumpet-shaped. The top of the collecting rod 91 is communicated with the discharge trough 10. The lower side of the control shell 5 penetrates the lower surface of the discharge pipe 1. The lower side of the control shell 5 is provided with a connecting pipe head 11 communicated with the interior thereof. In actual use, most of the impurities blocked by the filter plate 2 will accumulate at the bottom of the filter plate 2 under the action of inertia. Therefore, in this scheme, the process of rotating the collecting shell 92 one circle is divided into an upper half circle and a lower half circle (with the transverse axis of the filter plate 2 as the dividing line, the upper part is the upper half circle, and the lower half is the lower half circle). When the collecting shell 92 rotates from the upper half circle to the lower half circle, the collecting shell 92 can accumulate. The impurities accumulated at the bottom of the filter plate 2 are scraped into the collecting shell 92. When the collecting shell 92 rotates from the lower half circle to the upper half circle, the impurities and water collected in the collecting shell 92 will flow into the collecting rod 91 under the action of inertia, and enter the discharge trough 10. Since the discharge trough 10 is trumpet-shaped, no matter which direction the rotating shaft 3 rotates to, the water with mixed impurities entering the discharge trough 10 can flow into the control shell 5 through the inclined surface of the discharge trough 10, and finally be discharged from the connecting pipe head 11. The above structure can automatically clean and collect the impurities blocked by the filter plate 2. During use, there is no need to set an opening on the pipeline 1, which reduces the workload of the staff, improves the efficiency and speed of cleaning the waste heat recovery system pipeline, and ensures the efficiency of the operation of the waste heat recovery system.

[0032] A box or a collecting tank for collecting impurities is disposed at the lower side of the connecting pipe head 11, so that water containing impurities can be collected.

[0033] The collecting shell 92 is provided with a blocking mechanism 96 for blocking the feed trough 94 and the water outlet 95 respectively. In this way, when the water mixed with impurities in the collecting shell 92 flows into the outlet trough 10, the feed trough 94 and the water outlet 95 can be blocked, so as to avoid the water in the pipeline 1 from entering the outlet trough 10 as much as possible. The blocking mechanism 96 includes two movable shells 967, one movable shell 967 is arranged on the inner wall of the collecting shell 92 near the feed trough 94, and the other movable shell 967 is arranged on the outer surface of the collecting shell 92 near the water outlet 95 (this Such a setting can avoid as much as possible that the impurities in the collection shell 92 are blocked by the movable shell 967 near the water outlet 92 when flowing into the collection rod 91). The connection structures in the two movable shells 967 are exactly the same. For the sake of clarity, the following mainly describes the internal structure of the movable shell 967 near the feed trough 94. The movable shell 967 is provided with a sealing plate 968 that slides through the outer surface of the movable shell 967 on one side. The sealing plate 968 is located on one side outside the movable shell 967 and can block the feed trough 94. Similarly, the sealing plate 968 near the water outlet The sealing plate 968 on one side of the water outlet 95 can seal the water outlet 95. The inner wall of the collection shell 92 is rotatably connected with a mounting shaft 969. The outer surface of the mounting shaft 969 is sleeved with a gear 9610. A tooth groove 9611 meshing with the gear 9610 is provided on the surface of the sealing plate 968 on one side close to the gear 9610. A control pull plate 9612 is provided on the other side of the gear 9610. The other side of the control pull plate 9612 slides through the surface of the movable shell 967 close to the collection rod 91. The control pull plate 9612 is close to the gear 9610. The surface is also provided with a tooth groove 9611 which is meshed with the gear 9610. In this way, when it is necessary to control the sealing plate 968 to seal the feed trough 94 or the water outlet 95, it is only necessary to pull the control pull plate 9612 on the side outside the movable shell 967. Therefore, the tooth groove 9611 on the control pull plate 9612 meshes and transmits the gear 9610 to rotate, thereby causing the sealing plate 968 to move to the side away from the gear 9610. In this way, the sealing plate 968 gradually moves out of the movable shell 967, so that the feed trough 94 or the water outlet 95 can be sealed.

[0034] Sealing rubber pads are provided on the inner wall of the collecting shell 92 close to the feed trough 94 and the outer surface close to the water outlet 95 , thereby increasing the sealing performance of the sealing plate 968 to the water outlet 95 and the feed trough 94 .

[0035] A spring 9613 is provided between the mounting shaft 969 and the inner wall of the movable shell 967 . When the spring 9613 is not squeezed, the blocking plate 968 and the control pull plate 9612 are mostly located in the movable shell 967 , so that the blocking plate 968 cannot block the feed trough 94 or the water outlet 95 .

[0036] The discharge chute 10 is provided with a blocking ball 961 for blocking the collection rod 91. The blocking ball 961 is heavy, and a sealing rubber 963 is sleeved on the outer surface of the blocking ball 961 to increase the sealing performance between the blocking ball 961 and the collection rod 91. A pulling rod 962 is provided on the outer surface of the blocking ball 961 located inside the collection rod 91, and a pulling plate 965 is provided at the other end of the pulling rod 962. A knocking mechanism 964 for knocking the inner wall of the collection rod 91 is provided between the pulling rod 962 and the pulling plate 965, and the pulling plate 965 is facing away from the pulling rod 962. Two pulling ropes 966 are arranged on the surface, the other end of one pulling rope 966 extends into the collecting shell 92 and is connected to the control pull plate 9612 near the feeding trough 94, and the other pulling rope 966 slides through the outer surface of the collecting rod 91 and is connected to the control pull plate 9612 near the water outlet 95. When the collecting shell 92 rotates to the lower half circle and collects impurities, the blocking ball 961 blocks the collecting rod 91 under the action of inertia, thereby preventing the water in the pipeline 1 from entering the pipe 1 along the blocking ball 961 as much as possible. The situation in the discharge trough 10 ensures the stability of the water transport in the pipeline 1. When the collection shell 92 rotates from the lower half circle to the upper half circle, since the center of gravity of the blocking ball 961 remains unchanged, the blocking ball 961 lacks restriction, and the blocking ball 961 will pull the pulling rod 962 to move into the discharge trough 10, and the collection rod 91 cannot be blocked. At this time, the water mixed with impurities in the collection shell 92 enters the discharge trough 10 through the collection rod 91. At the same time, the two pulling ropes 966 will form a pulling force on the two control pull plates 9612, so that the two control pull plates 9 612 moves out of the movable shell 967, and at the same time, two sealing plates 968 respectively seal the feed trough 94 and the water outlet 95, and the spring 9613 is in a tightened state. The above structure can automatically open and close the feed trough 94, the water outlet 95 and the collecting rod 91 during the rotation of the collecting shell 92. No human control is required. It is completely based on the mechanical structure linkage, has high stability and accuracy, and there will be no situation where too much water in the pipeline 1 is discharged through the discharge trough 10, thereby ensuring the stability of the waste heat recovery system pipeline during operation.

[0037] The knocking mechanism 964 includes a twisted rod 9641, one end of which is rotatably connected to the surface of the pulling rod 962 away from the blocking ball 961, and the other end of the twisted rod 9641 is provided with a rotating shaft 9644, and the other end of the rotating shaft 9644 is rotatably connected to the pulling plate 965. A twisted sleeve 9642 spirally sleeved on the outer surface of the twisted rod 9641 is provided on the inner wall of the collecting rod 91 close to the feed trough 94, so that when the blocking ball 961 is displaced, the pulling rod 962 pulls the twisted rod 9641 to displace on the twisted sleeve 9642, so that the twisted rod 9641 rotates under the action of the twisted sleeve 9642, and the rotating shaft 9644 rotates synchronously with the twisted rod 9642.

[0038] A rotating ring 9643 is provided on the outer surface of the rotating shaft 9644, and a first spring 9645 movably provided on the outer surface of the twisted rod 9641 is provided between the rotating ring 9643 and the twisted sleeve 9642. Therefore, when the first spring 9645 is not squeezed, the first spring 9645 will form a thrust on the rotating ring 9643, so that the rotating ring 9643 is located on the side away from the twisted sleeve 9642.

[0039] An n-shaped frame 9647 is provided on the inner wall of the collecting rod 91, and a striking rod 9648 for striking the inner wall of the collecting rod 91 is slidably sleeved on the vertical plate of the n-shaped frame 9647, and a contact plate 9649 is provided at one end of the striking rod 9648 close to the rotating shaft 9644, and a second spring 96410 movably sleeved on the outer surface of the striking rod 9648 is provided between the contact plate 9649 and the n-shaped frame 9647, and a cam 9646 contacting the outer surface of the contact plate 9649 is sleeved on the outer surface of the rotating shaft 9644. During rotation, the cam 9646 rotates synchronously with the rotating shaft 9644, so that the cam 9646 continuously generates thrust on the contact plate 9649, and at the same time the second spring 96410 continuously contracts and stretches, so that the impact rod 9648 continuously impacts the inner wall of the collecting rod 91, causing the inner wall of the collecting rod 91 to vibrate, so that the impurities attached to the inner wall of the collecting rod 91 can slide better into the discharge trough 10, avoiding excessive impurities adhering to the inner wall of the collecting rod 91 as much as possible, and further ensuring the collection effect and efficiency of impurities.

[0040] A cleaning mechanism for cleaning the water outlet hole 95 is arranged inside the collecting shell 92 near the water outlet hole 95, and the cleaning mechanism includes a mounting plate 951, and the mounting plate 951 is arranged on the bottom wall of the collecting shell 92. The side of the mounting plate 951 is rotatably connected to a rotating disk 952, and the outer surface of the rotating disk 952 is provided with a plurality of fan blades 953 arranged in a circular array. When the collecting shell 92 collects impurities at the bottom of the filter plate 2, the water flow will form a thrust on the fan blades 953, so that the fan blades 953 synchronously drive the rotating disk 952 to rotate counterclockwise.

[0041] The bottom wall of the collecting shell 92 near the water outlet 95 is provided with an installation inclined rod 954, and the outer surface of the installation inclined rod 954 is provided with a sliding sleeve 955, and the surface of the sliding sleeve 955 facing the water outlet 95 is provided with a second brush 956 for cleaning the water outlet 95, and the surface of the sliding sleeve 955 facing away from the water outlet 95 is provided with an L-shaped rod 957, and the outer surface of the rotating disk 952 is provided with a toggle rod 958 whose other end contacts the cross bar of the L-shaped rod 957, so that when the rotating disk 952 rotates, the toggle rod 958 rotates synchronously with the rotating disk 952, and when the toggle rod 958 contacts the L-shaped rod 957, the toggle rod 958 rotates synchronously with the rotating disk 952. After the rod 957 contacts the cross bar, the toggle rod 958 will generate a thrust on the L-shaped rod 957, so that the L-shaped rod 957 drives the sliding sleeve 955 to move upward on the installation inclined rod 954. When the toggle rod 958 is not in contact with the L-shaped rod 957, the sliding sleeve 955 and the L-shaped rod 957 slide downward under the action of inertia. The above structure can control the second brush 956 to clean the water outlet 95 up and down, and try to avoid the situation where too many impurities block the water outlet 95, thereby ensuring the water permeability of the water outlet 95 and the collection effect of the collection shell 92 on impurities.

[0042] The working principle of the thermal system for recovering waste heat from exhaust steam of a steam turbine low-pressure cylinder provided by the present invention is as follows: S1. When the waste heat recovery system for exhaust steam of a low-pressure cylinder is in operation, water flows in the pipe 1, and the filter plate 2 blocks impurities in the water, so that the impurities adhere to the bottom of the filter plate 2 and the inner wall of the pipe 1; S2, the motor 8 is started, and the output shaft of the motor 8 synchronously drives the second bevel gear 7 to rotate, so the first bevel gear 6 rotates synchronously under the meshing transmission of the second bevel gear 7, so that the rotating shaft 3 drives the scraper 4 to rotate in the pipeline 1, so the scraper 4 can scrape off the impurities attached to the inner wall of the pipeline 1, and at the same time, the collecting shell 92 rotates synchronously with the rotating shaft 3. When the collecting shell 92 rotates from the upper half circle to the lower half circle, the collecting shell 92 can scrape the impurities accumulated on the bottom of the filter plate 2 into the collecting shell 92; S3. When water is discharged through the water outlet 95, the water flow will form a thrust on the fan blade 953, so that the fan blade 953 synchronously drives the rotating disk 952 to rotate counterclockwise, and the toggle rod 958 rotates synchronously with the rotating disk 952. When the toggle rod 958 contacts the cross bar of the L-shaped rod 957, the toggle rod 958 will form a thrust on the L-shaped rod 957, so that the L-shaped rod 957 drives the sliding sleeve 955 to move upward on the installation inclined rod 954. When the toggle rod 958 does not contact the L-shaped rod 957, the sliding sleeve 955 and the L-shaped rod 957 slide downward under the action of inertia, so as to brush the water outlet 95 back and forth; S4, when the collecting shell 92 rotates from the lower half circle to the upper half circle, the impurities and water collected in the collecting shell 92 will flow into the collecting rod 91 under the action of inertia, and enter the discharge trough 10, and at the same time, the blocking ball 961 will pull the pulling rod 962 to move into the discharge trough 10, and the collecting rod 91 cannot be blocked. At this time, the water mixed with impurities in the collecting shell 92 enters the discharge trough 10 through the collecting rod 91, and at the same time, the two pulling ropes 966 will form a pulling force on the two control pull plates 9612, so that the two control pull plates 9612 move out of the movable shell 967, and at the same time, the two blocking plates 968 respectively block the feed trough 94 and the water outlet 95, and the clockwork 9613 is in a tightened state; S5. When the blocking ball 961 is displaced, the pulling rod 962 pulls the twisted rod 9641 to displace on the twisted sleeve 9642, so the twisted rod 9641 rotates under the action of the twisted sleeve 9642, and the rotating shaft 9644 rotates synchronously with the twisted rod 9642, and the cam 9646 rotates synchronously with the rotating shaft 9644, so that the cam 9646 continuously forms a thrust on the contact plate 9649, and at the same time the second spring 96410 continuously contracts and stretches, so the impact rod 9648 continuously impacts the inner wall of the collecting rod 91, causing the inner wall of the collecting rod 91 to vibrate.

Claims

1. A thermal system for recovering waste heat from exhaust steam from a low-pressure cylinder of a steam turbine, comprising a heat pump unit, a condenser, a low-pressure heating system, a heat pump circulating pump, a heat pump external heat exchanger, a condensate pump, a circulating water pump, a cooling tower, a shaft heating, a plurality of pipes (1) for connection, and valves VA1, VA2, VA3, VA4, VA5, VB1, VB2, VC1, VC2, characterized in that: A filter plate (2) for filtering is installed in the pipe (1) near the cooling tower, the heat pump unit, the condenser and the output end of the heat pump external heat exchanger. A rotating shaft (3) is arranged on the side of the filter plate (2) facing the water flow direction. A scraper (4) in contact with the inner wall of the pipe (1) is arranged on the outer surface of the rotating shaft (3). A control housing (5) is arranged on the top wall of the pipe (1). The control housing (5) is located on the side of the filter plate (2) facing away from the water flow direction. The end of the rotating shaft (3) close to the control housing (5) rotates to pass through the filter plate (2) and rotates to pass through the control housing (5). The outer surface of the rotating shaft (3) is provided with a collecting assembly (9), which is arranged on a side of the filter plate (2) facing away from the control housing (5). The collecting assembly (9) comprises a collecting rod (91), which is arranged on the outer surface of the rotating shaft (3). The outer surface of the collecting rod (91) close to the filter plate (2) is provided with a first brush (93) for cleaning the surface of the filter plate (2). The other end of the collecting rod (91) is provided with a collecting housing (92) which is in contact with the inner wall of the pipe (1). The collecting housing (92) is also in contact with the surface of the filter plate (2). A feeding groove (94) which is in communication with the interior of the collecting housing (92) is provided on the surface of the collecting housing (92). The feeding groove (94) is arranged on a side of the collecting housing (92) away from the collecting rod (91). The feeding groove (94) is located in the direction of rotation of the rotating shaft (3). A plurality of water outlet holes (95) are provided on a surface of a side of the shell (92) away from the feed trough (94) and are all connected to the interior of the shell (92). The interior of the collecting rod (91) is hollow and connected to the interior of the collecting shell (92). A discharge trough (10) connected to the interior of the control shell (5) is provided in the rotating shaft (3). The discharge trough (10) is horn-shaped. The top of the collecting rod (91) is connected to the discharge trough (10). The lower side of the control shell (5) passes through the lower surface of the outlet pipe (1). The lower side of the control shell (5) is provided with a connecting pipe head (11) connected to the interior of the control shell (5). The collecting shell (92) is provided with a blocking mechanism (96) for blocking the feed trough (94) and the water outlet hole (95) respectively. The interior of the collecting shell (92) near the water outlet hole (95) is provided with a cleaning mechanism for cleaning the water outlet hole (95).

2. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 1, characterized in that: Two pipes (1) forming a loop are arranged between the output and input ends of the condenser and the input and output ends of the cooling tower. The circulating water pump is arranged at a section of the pipe (1) close to the output end of the cooling tower. A pipe (1) for installing a heat pump external heat exchanger is arranged between the two loop pipes (1). Valves VC1 and VC2 are arranged on both sides of the heat pump external heat exchanger. The heat pump circulating pump and the condensate pump are respectively connected to the output end of the bottom of the condenser. Two pipes (1) are also arranged between the heat pump circulating pump and the condensate pump and the input end of the heat pump unit. Valves VA3 and VA4 are arranged on the pipe (1) connected to the condensate pump. Valve VA4 is arranged on the pipe (1) connected to the heat pump circulating pump. The heat pump unit A pipeline (1) is also provided between the output end of the heat pump unit and the low-pressure heating system. A valve VA2 is provided on the pipeline (1) between the heat pump unit and the low-pressure heating system. A pipeline communicating between the pipeline (1) and the pipeline (1) connected to the condensate pump is provided between the pipeline (1) and the pipeline (1) connected to the condensate pump. The valve VA1 is provided on the pipeline. A pipeline (1) connected to the input end of the condenser is provided between the heat pump external heat exchanger and the heat pump unit. The valve VB1 is provided on a section of the pipeline (1) close to the heat pump external heat exchanger. The valve VA5 is provided on a section of the pipeline (1) close to the condenser. A pipeline (1) is also provided between the pipeline (1) connected to the heat pump circulation pump and the input end of the heat pump external heat exchanger. The valve VB2 is provided on the pipeline (1).

3. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 2, characterized in that: A first bevel gear (6) is sleeved on the outer surface of one end of the rotating shaft (3) located in the control housing (5); a second bevel gear (7) is meshedly connected to the upper side of the first bevel gear (6); a motor (8) is arranged on the outer surface of the pipeline (1); the lower end of the output shaft of the motor (8) rotates and penetrates into the control housing (5) and is connected to the upper surface of the second bevel gear (7).

4. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 3, characterized in that: The blocking mechanism (96) comprises two movable shells (967), one movable shell (967) being arranged on the inner wall of the collection shell (92) near the feed trough (94), and the other movable shell (967) being arranged on the outer surface of the collection shell (92) near the water outlet hole (95), a blocking plate (968) being arranged inside the movable shell (967) and slidingly penetrating the outer surface of the movable shell (967), the blocking plate (968) being located on the side outside the movable shell (967) and being capable of blocking the feed trough (94), and the blocking plate (968) being located on the side near the water outlet hole (95) and being capable of blocking the water outlet hole (95), and a mounting shaft (969) being rotatably connected to the inner wall of the collection shell (92), The outer surface of the mounting shaft (969) is sleeved with a gear (9610); a tooth groove (9611) meshingly connected to the gear (9610) is provided on the surface of the sealing plate (968) on one side close to the gear (9610); a control pull plate (9612) is provided on the other side of the gear (9610); the other side of the control pull plate (9612) slides through the surface of the movable shell (967) on one side close to the collecting rod (91); a tooth groove (9611) meshingly connected to the gear (9610) is also provided on the surface of the control pull plate (9612) close to the gear (9610); a clockwork spring (9613) is provided between the mounting shaft (969) and the inner wall of the movable shell (967).

5. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 4, characterized in that: Sealing rubber pads are provided on the inner wall of the collection shell (92) close to the feed trough (94) and on the outer surface close to the water outlet (95).

6. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 4, characterized in that: The discharge chute (10) is provided with a blocking ball (961) for blocking the collection rod (91); the outer surface of the blocking ball (961) is sleeved with a sealing rubber (963) for increasing the sealing performance between the blocking ball and the collection rod (91); a pulling rod (962) is provided on the outer surface of the blocking ball (961) located inside the collection rod (91); a pulling plate (965) is provided at the other end of the pulling rod (962); and a sealing member for sealing the collection rod (91) is provided between the pulling rod (962) and the pulling plate (965). 91), two pulling ropes (966) are arranged on the surface of the pulling plate (965) facing away from the pulling rod (962), the other end of one pulling rope (966) extends into the collecting shell (92) and is connected to the control pulling plate (9612) near the feeding trough (94), and the other pulling rope (966) slides through the outer surface of the collecting rod (91) and is connected to the control pulling plate (9612) near the water outlet (95).

7. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 6, characterized in that: The knocking mechanism (964) comprises a twisted rod (9641), one end of the twisted rod (9641) being rotatably connected to the surface of the pulling rod (962) away from the blocking ball (961), the other end of the twisted rod (9641) being provided with a rotating shaft (9644), the other end of the rotating shaft (9644) being rotatably connected to the pulling plate (965), a twisted sleeve (9642) being spirally sleeved on the outer surface of the twisted rod (9641) being provided on the inner wall of the collecting rod (91) close to the feeding trough (94), a rotating ring (9643) being rotatably sleeved on the outer surface of the rotating shaft (9644), and a first spring (9645) being movably sleeved on the outer surface of the twisted rod (9641) being provided between the rotating ring (9643) and the twisted sleeve (9642).

8. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 7, characterized in that: An n-shaped frame (9647) is provided on the inner wall of the collecting rod (91); a striking rod (9648) is slidably sleeved on the vertical plate of the n-shaped frame (9647) for striking the inner wall of the collecting rod (91); a contact plate (9649) is provided at one end of the striking rod (9648) close to the rotating shaft (9644); a second spring (96410) movably sleeved on the outer surface of the striking rod (9648) is provided between the contact plate (9649) and the n-shaped frame (9647); and a cam (9646) is sleeved on the outer surface of the rotating shaft (9644) for contacting the outer surface of the contact plate (9649).

9. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 1 or 8, characterized in that: The cleaning mechanism comprises a mounting plate (951), the mounting plate (951) being arranged on the bottom wall of the collection shell (92), a rotating disk (952) being rotatably connected to the side surface of the mounting plate (951), and a plurality of fan blades (953) arranged in a circular array are arranged on the outer surface of the rotating disk (952).

10. A thermal system for recovering waste heat from exhaust from a low-pressure cylinder of a steam turbine according to claim 9, characterized in that: The bottom wall of the collecting shell (92) near the water outlet hole (95) is provided with an installation inclined rod (954); a sliding sleeve (955) is provided on the outer surface of the installation inclined rod (954); a second brush (956) for cleaning the water outlet hole (95) is provided on the surface of the sliding sleeve (955) facing the water outlet hole (95); an L-shaped rod (957) is provided on the surface of the sliding sleeve (955) facing away from the water outlet hole (95); and a toggle rod (958) is provided on the outer surface of the rotating disk (952), the other end of which is in contact with a crossbar of the L-shaped rod (957).

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