Heat supply and water return mechanism of thermal power plant

Abstract

The utility model relates to the technical field of heat supply and water return, and discloses a heat supply and water return mechanism of a thermal power plant, which comprises a first water return pipe, a second water return pipe and an iron removal box, one end of the first water return pipe is fixedly connected with one end of the second water return pipe through a connecting assembly, and the other end of the second water return pipe is communicated with the inside of the iron removal box. A pressure assembly is arranged in the connecting assembly, a plurality of balance pipes are fixedly connected to the side wall of the first water return pipe in a penetrating mode, a protection assembly is fixedly arranged on the side wall of the second water return pipe, and a bypass pipe is fixedly connected to the side wall of the protection assembly in a penetrating mode. And a third water return pipe is fixedly connected to the outer wall of one side of the iron removal box in a penetrating manner. The balance pipe and the pressure assembly are arranged, the thinned sealing ring is attached to and sealed with the inner wall of the second annular groove again under the action of the first spring, the bypass pipe and the second water return pipe are communicated to form a branch through the protection assembly, and pressure borne by the water return pipe is relieved before shutdown maintenance.

Description

Technical Field

[0001] The utility model relates to the technical field of heating water return, in particular to a heating water return mechanism for a thermal power plant. Background Art

[0002] Thermal power plant heating plays an important role in my country's energy structure. While using coal, natural gas and other fuels to burn to generate electricity, the hot water and high-temperature steam produced by combustion can be used for heating, and the heating return water is generally transported through the return water mechanism for heating.

[0003] For example, a thermal power plant heat return water mechanism with publication number CN219670302U includes an iron removal box, a cation exchanger and a deaerator connected in sequence through a return water pipe, and a plurality of movably connected magnet plates are provided inside the iron removal box, and a return water channel is provided between the magnet plate and the inner wall of the iron removal box. By arranging an iron removal box with a magnet plate before the cation exchanger, the magnet plate has a certain magnetism and can adsorb the iron in the return water, thereby avoiding the precipitation and accumulation of iron in the return water pipe and the cation exchanger and reducing damage; a return water channel is left between the iron removal box and the magnet plate to facilitate the contact between water and the magnet plate and ensure the adsorption effect of iron.

[0004] The above patent removes the iron in the return water by adding an iron removal box to prevent its deposition in the return water pipe. However, there are still some shortcomings in its use, such as: after long-term use, the sealing ring at the return water pipe connection will corrode and become thinner, and because the return water has a certain amount of heat, it is easy to cause the return water to spray out from the pipe connection under the action of steam pressure, causing harm to the staff; when the steam pressure in the return water pipe is large, it is easy to cause damage to the return water pipe. Although a pressure gauge is provided in production to detect the pressure in the pipe, there is a lack of corresponding buffer measures before the staff finds the abnormal pressure and shuts down for maintenance.

[0005] Therefore, we proposed a heat return water mechanism for a thermal power plant in order to solve the above-mentioned problems. Utility Model Content

[0006] The utility model aims to provide a heat supply and return water mechanism for a thermal power plant, so as to solve the problems proposed in the above-mentioned background technology that after long-term use, the sealing ring at the connection of the return water pipe will corrode and become thinner, and because the return water has a certain amount of heat, it is easy to cause the return water to spray out from the connection of the pipe under the action of steam pressure, causing harm to the staff; when the steam pressure in the return water pipe is relatively large, it is easy to cause damage to the return water pipe. Although a pressure gauge is provided in production to detect the pressure in the pipe, there is a lack of corresponding buffer measures before the staff finds that the pressure is abnormal and shuts down for maintenance.

[0007] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a heat supply and return water mechanism of a thermal power plant, comprising a first return water pipe, a second return water pipe and an iron removal box, wherein one end of the first return water pipe and the second return water pipe are fixedly connected by a connecting assembly, and the other end of the second return water pipe is communicated with the interior of the iron removal box, a pressure assembly is arranged inside the connecting assembly, a plurality of balancing pipes are passed through and fixedly connected to the side wall of the first return water pipe, the plurality of balancing pipes are arranged in a circular array, one end of each of the balancing pipes is fixedly connected to the end face of the connecting assembly, a protection assembly is fixedly arranged on the side wall of the second return water pipe, a bypass pipe is passed through and fixedly connected to the side wall of the protection assembly, one end of the bypass pipe is communicated with the interior of the iron removal box, and a third return water pipe is passed through and fixedly connected to the outer wall of one side of the iron removal box.

[0008] Preferably, the connecting assembly includes a first connecting plate fixedly connected to one end of the first return pipe and a second connecting plate fixedly connected to one end of the second return pipe, and a plurality of bolt holes are provided on the end faces of the first connecting plate and the second connecting plate, and the plurality of bolt holes are arranged in a circular array.

[0009] Preferably, a first annular groove is formed on one end surface of the first connection disk, a second annular groove is formed on an end surface of the second connection disk adjacent to the first connection disk, and sealing rings are provided inside the first annular groove and the second annular groove.

[0010] Preferably, the pressure assembly includes an annular support plate that is slidably arranged on the inner wall of the first annular groove, and a plurality of telescopic tubes are fixedly connected to the positions of the plurality of balancing tubes on the outer wall of one side of the annular support plate, and one end of each of the telescopic tubes passes through the side wall of the first annular groove and is fixedly connected to the corresponding balancing tube, and a first spring is sleeved on the side wall of each of the telescopic tubes, and one end of each of the first springs is fixedly connected to the side wall of the annular support plate, and the other end of each of the first springs is fixedly connected to the inner wall of the first annular groove.

[0011] Preferably, the protection component includes a plunger cylinder passing through and fixedly connected to the side wall of the second return water pipe, the bypass pipe passing through and fixedly connected to the side wall of the plunger cylinder, a telescopic rod fixedly connected to the top wall of the inner cavity of the plunger cylinder, a piston fixedly connected to the movable end of the telescopic rod, and the piston is sealingly and slidably connected to the inner cavity side wall of the plunger cylinder.

[0012] Preferably, the top surface of the piston is elastically connected to the top wall of the inner cavity of the plunger cylinder via a second spring, and the telescopic rod passes through the inner circle of the second spring. A limiting protrusion is fixedly provided at the lower end of the inner cavity side wall of the plunger cylinder.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. By setting up the balance pipe and pressure assembly, when the sealing ring is corroded and thinned due to long-term use, the annular resisting plate is pushed and squeezed by the elastic force of the first spring, so that the sealing ring fits tightly with the inner wall of the second annular groove again. The balance pipe balances the pressure on both sides of the annular resisting plate to avoid the sealing ring and the annular resisting plate from deviating toward the side of the first spring when the pressure is high, thereby ensuring that the annular resisting plate can stably press the sealing ring.

[0015] 2. By setting up a protection component, when the pressure in the pipeline continues to increase, the piston in the protection component is pushed and slides upward along the inner cavity of the plunger cylinder. When the piston is pushed to the top of the bypass pipe, the bypass pipe is connected with the second return pipe to form a branch. Before shutting down for maintenance, the pressure on the first return pipe and the second return pipe can be relieved to a certain extent, thereby enhancing the safety of the return mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the connection structure of the first water return pipe and the second water return pipe in the utility model;

[0018] Figure 3 It is a cross-sectional structural schematic diagram of the first water return pipe part in the utility model;

[0019] Figure 4 for Figure 3 An enlarged structural diagram of the middle pressure component part;

[0020] Figure 5 It is a schematic cross-sectional structural diagram of the second water return pipe and the protection component part in the utility model.

[0021] In the figure: 1. first water return pipe; 2. second water return pipe; 3. connecting assembly; 31. first connecting plate; 311. first annular groove; 32. second connecting plate; 321. second annular groove; 33. bolt hole; 34. sealing ring; 4. pressure assembly; 41. annular plate; 42. telescopic tube; 43. first spring; 5. balance tube; 6. protection assembly; 61. plunger cylinder; 62. telescopic rod; 63. piston; 64. second spring; 65. limiting protrusion; 7. bypass pipe; 8. iron removal box; 9. third water return pipe. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1

[0024] See also Figure 1-Figure 4 A heat supply and return water mechanism of a thermal power plant comprises a first return water pipe 1, a second return water pipe 2 and an iron removal box 8, one end of the first return water pipe 1 and the second return water pipe 2 are fixedly connected by a connecting assembly 3, the other end of the second return water pipe 2 is communicated with the interior of the iron removal box 8, a pressure assembly 4 is arranged inside the connecting assembly 3, a plurality of balance pipes 5 are fixedly connected through the side wall of the first return water pipe 1, the plurality of balance pipes 5 are arranged in a circular array, one end of each balance pipe 5 is fixedly connected to the end face of the connecting assembly 3, a protection assembly 6 is fixedly arranged on the side wall of the second return water pipe 2, a bypass pipe 7 is fixedly connected through the side wall of the protection assembly 6, one end of the bypass pipe 7 is communicated with the interior of the iron removal box 8, and a third return water pipe 9 is fixedly connected through one side outer wall of the iron removal box 8.

[0025] The connecting assembly 3 includes a first connecting plate 31 fixedly connected to one end of the first return pipe 1 and a second connecting plate 32 fixedly connected to one end of the second return pipe 2. The end faces of the first connecting plate 31 and the second connecting plate 32 are both provided with a plurality of bolt holes 33, and the plurality of bolt holes 33 are arranged in a circular array.

[0026] A first annular groove 311 is formed on one end surface of the first connection disk 31 , a second annular groove 321 is formed on the end surface of the second connection disk 32 adjacent to the first connection disk 31 , and a sealing ring 34 is disposed inside both the first annular groove 311 and the second annular groove 321 .

[0027] The pressure assembly 4 includes an annular support plate 41 that is slidably arranged on the inner wall of the first annular groove 311, and a plurality of telescopic tubes 42 are fixedly connected to the positions of the plurality of balance tubes 5 on the outer wall of one side of the annular support plate 41. One end of each telescopic tube 42 passes through the side wall of the first annular groove 311 and is fixedly connected to the corresponding balance tube 5. A first spring 43 is sleeved on the side wall of each telescopic tube 42, and one end of each first spring 43 is fixedly connected to the side wall of the annular support plate 41, and the other end of each first spring 43 is fixedly connected to the inner wall of the first annular groove 311.

[0028] In this embodiment: the first connecting plate 31 and the second connecting plate 32 are connected by bolts to achieve the purpose of connecting the first water return pipe 1 and the second water return pipe 2, and a sealing ring 34 is set in the first annular groove 311 and the second annular groove 321 for sealing. When the sealing ring 34 is corroded and thinned due to long-term use, the sealing ring 34 cannot fit well with the inner wall of the first annular groove 311 and the second annular groove 321. At this time, under the elastic force of the first spring 43, the annular plate 41 is pushed and squeezed to make the sealing ring 34 fit tightly with the inner wall of the second annular groove 321 again, avoiding leakage at the connection between the first water return pipe 1 and the second water return pipe 2; part of the pressure in the first water return pipe 1 can be transmitted to the side of the annular plate 41 close to the first spring 43 through the balancing pipe 5, so that the pressure on both sides of the annular plate 41 is balanced, avoiding the problem that the sealing ring 34 and the annular plate 41 are offset to the side of the first spring 43 when the pressure is high, thereby ensuring that the annular plate 41 can stably press the sealing ring 34.

[0029] Example 2

[0030] This embodiment is an improvement made on the basis of embodiment 1. For details, please refer to Figure 5 The protection component 6 includes a plunger cylinder 61 that passes through and is fixedly connected to the side wall of the second return water pipe 2, the bypass pipe 7 passes through and is fixedly connected to the side wall of the plunger cylinder 61, a telescopic rod 62 is fixedly connected to the top wall of the inner cavity of the plunger cylinder 61, and a piston 63 is fixedly connected to the movable end of the telescopic rod 62, and the piston 63 is sealed and slidably connected to the inner cavity side wall of the plunger cylinder 61.

[0031] The top surface of the piston 63 is elastically connected to the top wall of the inner cavity of the plunger tube 61 via a second spring 64 , and the telescopic rod 62 passes through the inner circle of the second spring 64 . A limiting protrusion 65 is fixedly provided at the lower end of the inner cavity side wall of the plunger tube 61 .

[0032] In this embodiment: when the pressure in the pipeline continues to increase, in order to avoid damage to the pipeline due to excessive pressure before shutdown for maintenance, the bypass pipe 7 is activated to temporarily relieve the pressure on the first return pipe 1 and the second return pipe 2, so that the staff has enough time to shut down after discovering the pressure abnormality. During this process, the piston 63 in the protection component 6 is pushed and slides upward along the inner cavity of the plunger cylinder 61. When the piston 63 is pushed to the top of the bypass pipe 7, the bypass pipe 7, the plunger cylinder 61 and the second return pipe 2 form a branch, thereby alleviating the pressure on the first return pipe 1 and the second return pipe 2 to a certain extent, thereby enhancing the safety of the return water mechanism. After shutdown, the piston 63 is reset under the elastic force of the second spring 64.

[0033] Working principle: Part of the pressure in the first water return pipe 1 is transmitted to the side of the annular plate 41 close to the first spring 43 through the balance pipe 5, so that the pressure on both sides of the annular plate 41 is balanced. When the sealing ring 34 is corroded and thinned due to long-term use, the annular plate 41 is pushed by the elastic force of the first spring 43, and the annular plate 41 squeezes the sealing ring 34 so that it fits tightly with the inner wall of the second annular groove 321 again. When the pressure in the first water return pipe 1 and the second water return pipe 2 continues to increase due to abnormal pressure, the piston 63 in the protection component 6 is pushed, and the piston 6 3 slides upward along the inner cavity side wall of the plunger cylinder 61. During this process, the telescopic rod 62 continues to shrink and the second spring 64 is compressed. When the piston 63 slides to the upper side of the bypass pipe 7, the bypass pipe 7 is connected with the second return pipe 2 to form a branch. After the return water enters the iron removal box 8, the iron in the water is adsorbed by the magnetic plate built in the iron removal box 8, and then the return water is output from the third return pipe 9 and continues to enter the cation exchanger, deaerator and other equipment for further treatment. After the shutdown, under the action of the second spring 64, the piston 63 is reset and abuts against the top surface of the limit protrusion 65.

[0034] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heat supply water return mechanism for a thermal power plant, comprising a first water return pipe (1), a second water return pipe (2) and an iron removal box (8), characterized in that: One end of the first water return pipe (1) and the second water return pipe (2) are fixedly connected via a connecting assembly (3), the other end of the second water return pipe (2) is communicated with the interior of the iron removal box (8), a pressure assembly (4) is arranged inside the connecting assembly (3), a plurality of balancing pipes (5) are fixedly connected through the side wall of the first water return pipe (1), the plurality of balancing pipes (5) are arranged in a circular array, one end of each balancing pipe (5) is fixedly connected to the end face of the connecting assembly (3), a protection assembly (6) is fixedly arranged on the side wall of the second water return pipe (2), a bypass pipe (7) is fixedly connected through the side wall of the protection assembly (6), one end of the bypass pipe (7) is communicated with the interior of the iron removal box (8), and a third water return pipe (9) is fixedly connected through the outer wall of one side of the iron removal box (8).

2. A thermal power plant heat return mechanism according to claim 1, characterized in that: The connection assembly (3) comprises a first connection plate (31) fixedly connected to one end of the first water return pipe (1) and a second connection plate (32) fixedly connected to one end of the second water return pipe (2), and the end surfaces of the first connection plate (31) and the second connection plate (32) are each provided with a plurality of bolt holes (33), and the plurality of bolt holes (33) are arranged in a circular array.

3. A thermal power plant heat supply and water return mechanism according to claim 2, characterized in that: A first annular groove (311) is provided on one end surface of the first connection disk (31), a second annular groove (321) is provided on an end surface of the second connection disk (32) adjacent to the first connection disk (31), and a sealing ring (34) is provided inside both the first annular groove (311) and the second annular groove (321).

4. A thermal power plant heat supply and water return mechanism according to claim 3, characterized in that: The pressure assembly (4) comprises an annular support plate (41) which is slidably arranged on the inner wall of the first annular groove (311); a plurality of telescopic tubes (42) are fixedly connected to the positions of the plurality of balancing tubes (5) on the outer wall of one side of the annular support plate (41); one end of each of the telescopic tubes (42) passes through the side wall of the first annular groove (311) and is fixedly connected to the corresponding balancing tube (5); a first spring (43) is sleeved on the side wall of each of the telescopic tubes (42); one end of each of the first springs (43) is fixedly connected to the side wall of the annular support plate (41); and the other end of each of the first springs (43) is fixedly connected to the inner wall of the first annular groove (311).

5. A thermal power plant heat supply and water return mechanism according to claim 1, characterized in that: The protection assembly (6) comprises a plunger cylinder (61) penetrating and fixedly connected to the side wall of the second water return pipe (2); the bypass pipe (7) penetrating and fixedly connected to the side wall of the plunger cylinder (61); a telescopic rod (62) is fixedly connected to the top wall of the inner cavity of the plunger cylinder (61); a piston (63) is fixedly connected to the movable end of the telescopic rod (62); and the piston (63) is sealingly and slidably connected to the inner cavity side wall of the plunger cylinder (61).

6. A thermal power plant heat supply and water return mechanism according to claim 5, characterized in that: The top surface of the piston (63) is elastically connected to the top wall of the inner cavity of the plunger tube (61) via a second spring (64), and the telescopic rod (62) passes through the inner circle of the second spring (64). A limiting protrusion (65) is fixedly provided at the lower end of the inner cavity side wall of the plunger tube (61).

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