A sleeve-type integrated desuperheater and its assembly method and application

Abstract

The present invention discloses a sleeve-type integrated cooler and its assembly method and application, which includes: a support component; a valve stem; a sealing component; a cooling and regulating component, wherein the cooling and regulating component includes a nozzle installed at the other end of the tube body and a valve plug having one end connected to the other end of the valve stem and the other end matched with the nozzle; the cooling and regulating component has a first and a second state: when it is in the first state, the other end of the valve plug or its outer wall contacts and seals with the nozzle; when it is in the second state, the accommodating cavity communicates with the nozzle. In this way, only one component moves, and the hard-surfaced valve plug and the inserted nozzle with internal parts made of high-quality alloy steel have good tightness, thus having high reliability and wear resistance, and are easy to install.

Description

Technical Field

[0001] The present invention belongs to the technical field of desuperheaters and relates to a desuperheater, in particular to a sleeve-type integrated desuperheater and an assembly method and application thereof. Background Art

[0002] The steam desuperheater is controlled by the signal from the temperature controller and is the operating component in the temperature control system. The desuperheater's task is to spray the amount of water corresponding to the signal received by the actuator evenly into the steam pipe. In order to ensure the function and service life of the desuperheater, all control circuits must be correctly arranged and operate normally. Oscillations in temperature control can cause thermal fatigue of the desuperheater and its internal parts.

[0003] The Chinese utility model patent with application number 201921631445.4 discloses a new type of superheated steam desuperheater, which consists of a pipe body, a spray cooling device, a flow guide device and a number of positioning bolts. The flow guide device of the utility model can make the superheated steam first realize diversion after entering the main pipe, and then form an inner direct current and outer vortex flow field. The existence of the inner direct current and outer vortex flow field intensifies the turbulence of the superheated steam, improves the mixing degree of the droplet jet generated after the cooling water is atomized and the superheated steam, accelerates the evaporation rate of the droplet jet in the superheated steam, improves the cooling efficiency, and at the same time suppresses the erosion and local thermal shock caused by the large particle size droplets produced by poor atomization hitting the pipe wall. However, the desuperheater has low integration, and its reliability and tightness need to be improved. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a sleeve-type integrated desuperheater in order to overcome the deficiencies of the prior art.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: a sleeve-type integrated desuperheater, which comprises:

[0006] A support assembly, the support assembly comprising a tube body and a valve body, the tube body is provided with a receiving cavity, one end of the valve body is connected to one end of the tube body and the other end is provided with a connecting seat, the valve body is provided with a flow channel communicating with the receiving cavity and the connecting seat and a water inlet pipe communicating with the flow channel is provided on its side wall;

[0007] A valve stem, which is adjustably inserted in the accommodating cavity and has one end extending through the valve body to the outside of the connecting seat;

[0008] A sealing assembly, the sealing assembly comprising a packing seat installed in the connecting seat and sleeved on the valve stem, a packing filled between the connecting seat and the valve stem and located outside the packing seat, a packing gland sleeved on the valve stem and abutting against the packing, and a packing pressure plate installed at the end of the connecting seat through a connecting member group and sleeved on the valve stem to abut against the packing gland;

[0009] A temperature reduction and regulation component, the temperature reduction and regulation component includes a nozzle installed at the other end of the tube body and a valve plug with one end connected to the other end of the valve stem and the other end cooperating with the nozzle; the temperature reduction and regulation component has a first and a second state: when it is in the first state, the other end of the valve plug or its outer wall is in contact and sealed with the nozzle; when it is in the second state, the accommodating chamber is communicated with the nozzle.

[0010] Optimally, the sealing assembly further comprises a guide sleeve installed in the connecting seat and sleeved on the valve stem, and a packing spacer sleeve sleeved on the valve stem to separate the packing, and the packing seat is arranged on the outside of the guide sleeve.

[0011] Optimally, the connecting member group includes a plurality of packing studs connecting the connecting seat and the packing pressure plate and a packing nut correspondingly installed on each of the packing studs.

[0012] Optimally, the sealing assembly further comprises a dust ring installed between the packing pressure plate and the valve stem and matched with the packing gland, and a bracket nut formed on the outer peripheral surface of the connecting seat and flush with its outer end surface.

[0013] Optimally, the temperature reduction and regulation component also includes a sleeve installed in the accommodating chamber and connected to the nozzle, the sleeve is sleeved on the valve plug and has a plurality of water injection holes thereon, the sleeve divides the accommodating chamber into a first cavity and a second cavity; when the temperature reduction and regulation component is in a first state, the sleeve is sealed from the valve plug, and the first cavity and the second cavity are not connected; when the temperature reduction and regulation component is in a second state, the sleeve is unsealed from the valve plug, and the first cavity and the second cavity are connected through the water injection holes.

[0014] Furthermore, the orifice area of ​​the nozzle is adjustable.

[0015] Optimally, the filler is a graphite filler or a braided filler.

[0016] Another object of the present invention is to provide an assembly method of the above-mentioned sleeve-type integrated desuperheater, which comprises the following steps:

[0017] (a) grinding the nozzle and the valve plug using an abrasive;

[0018] (b) inserting the valve stem and valve plug into the support assembly to above the closed position, leaving space;

[0019] (c) tightening the nozzle to be mounted on the tube body of the support assembly and welding it;

[0020] (d) Install the sealing assembly and ensure that there is no leakage on the nozzle sealing surface and nozzle welding point when the nozzle is in the closed position.

[0021] Optimally, in step (c), the valve plug is also moved so as to make multiple up and down movements to make contact and separate from the nozzle, and then is welded.

[0022] Another object of the present invention is to provide an application of a sleeve-type integrated desuperheater, wherein the sleeve-type integrated desuperheater, a steam pipe, a temperature sensor, a temperature transmitter, a PID controller, a condensate tank and a control thermometer form a steam desuperheating control system, the steam pipe has a superheated steam inlet and a desuperheating steam inlet, the sleeve-type integrated desuperheater has a desuperheating water inlet, the steam pipe is installed with a temperature sensor extending into the interior thereof, a control thermometer extending into the interior thereof and located downstream of the temperature sensor, and a condensate tank connected to the steam pipe and located downstream of the control thermometer, the temperature sensor is also connected to the temperature transmitter, the PID controller is respectively connected to the sleeve-type integrated desuperheater and the temperature transmitter, the angle formed between the sleeve-type integrated desuperheater and the axis of the steam pipe is an acute angle, the angle formed between the temperature sensor and the axis of the steam pipe is an acute angle, and the control thermometer is perpendicular to the axis of the steam pipe.

[0023] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the sleeve-type integrated desuperheater of the present invention installs the valve stem and the temperature reduction and adjustment component of a specific structure in the support component, so that only one component moves (the valve stem, which in turn drives the valve plug), the valve plug with a hard surface and the inserted nozzle with internal parts made of high-quality alloy steel have good tightness, thereby having high reliability and wear resistance, and is easy to install (vertical, horizontal, and inclined pipelines are all possible); high adjustable ratio, 40:1 (water) and high steam cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the sleeve-type integrated desuperheater in Example 1;

[0025] Figure 2 for Figure 1 A partial enlarged view of

[0026] Figure 3 It is a schematic diagram of the application of the sleeve-type integrated desuperheater of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the sleeve-type integrated desuperheater in Example 2;

[0028] Figure 5 for Figure 3 A partial enlarged view of

[0029] Figure 6 This is a partial enlarged view of the sleeve-type integrated desuperheater in Example 3. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention will be described in detail below.

[0031] Example 1

[0032] This embodiment provides a sleeve-type integrated desuperheater, such as Figure 1 As shown, it includes a support component, a valve stem 4, a sealing component and a temperature reduction and adjustment component.

[0033] The support assembly includes a tube body 3 and a valve body 6. A receiving cavity is provided in the tube body 3 (the receiving cavity usually penetrates the tube body 3 and is coaxial with the tube body 3, and the size of the outer end of the receiving cavity is usually larger than the part on the inner side thereof). One end of the valve body 6 is connected to one end of the tube body 3 and a connecting seat is provided at the other end (the connecting seat is also coaxial with the tube body 3). A flow channel communicating with the receiving cavity and the connecting seat is provided in the valve body 6 and a water inlet pipe communicating with the flow channel is provided on its side wall (the water inlet pipe has a cooling water inlet 25). The valve stem 4 is adjustably inserted in the receiving cavity and one end extends to the outside of the connecting seat through the valve body 6; a conventional pneumatic actuator is installed at one end of the valve stem 4, and the movement of the valve stem 4 is driven by the pneumatic actuator.

[0034] The sealing assembly includes a packing seat 11 installed in the connecting seat and sleeved on the valve stem 4, a packing 8 filled between the connecting seat and the valve stem 4 and located outside the packing seat 11, a packing gland 12 sleeved on the valve stem 4 and abutting against the packing 8, and a packing pressure plate 9 installed at the end of the connecting seat through a connecting member group and sleeved on the valve stem 4 to abut against the packing gland 12. In this embodiment, the structure of the packing 8 is as follows Figure 2 As shown, it is EVSP 9000 graphite packing.

[0035] The temperature reduction and adjustment component includes a nozzle 1 (the orifice area of ​​the nozzle is adjustable) installed at the other end of the pipe body 3 and a valve plug 2 (also called a valve core) connected to the other end of the valve stem 4 at one end and matched with the nozzle 1 at the other end; the temperature reduction and adjustment component has a first and a second state: when it is in the first state, the other end of the valve plug 2 or its outer wall is in contact and sealed with the nozzle 1; when it is in the second state, the accommodating cavity is connected with the nozzle 1. In this embodiment, the valve plug 2 is composed of three sections with different cross-sectional radii connected in sequence (the cross-sectional radius increases in the direction from the nozzle 1 to the valve stem 4), and the outer surface of the middle structure is sealed with the inner wall of the sleeve 5.

[0036] In this embodiment, the sealing assembly further includes a guide sleeve 7 installed in the connecting seat and sleeved on the valve stem 4, and a packing spacer 10 sleeved on the valve stem 4 to separate the packing 8, and the packing seat 11 is arranged on the outside of the guide sleeve 7. The connecting piece group includes a plurality of packing studs 16 connecting the connecting seat and the packing pressure plate 9 and a packing nut 15 correspondingly installed on each packing stud 16. The sealing assembly further includes a dust ring 13 installed between the packing pressure plate 9 and the valve stem 4 and matched with the packing gland 12, and a bracket nut 14 formed on the outer peripheral surface of the connecting seat and flush with its outer end surface. The temperature reduction and adjustment component also includes a sleeve 5 installed in the accommodating cavity and connected to the nozzle 1. The sleeve 5 is sleeved on the valve plug 2 and has multiple water injection holes on it. The sleeve 5 divides the accommodating cavity into a first cavity and a second cavity. When the temperature reduction and adjustment component is in a first state, the sleeve 5 is sealed with the valve plug 2, and the first cavity and the second cavity are not connected. When the temperature reduction and adjustment component is in a second state, the sleeve 5 and the valve plug 2 are unsealed, and the first cavity and the second cavity are connected through the water injection holes.

[0037] Installation of the above-mentioned sleeve-type integrated desuperheater: (1) The flange-type pipe base (the valve body 6 is provided with a mounting flange) should be welded to the steam pipe in accordance with the industrial pipeline welding engineering construction specifications; many countries do not allow the angle between the branch pipe base and the steam pipe to be less than 45°. If the desuperheater is equipped with a lining assembly to improve the adjustable ratio, the steam pipe must be cut to the required length and then the lining assembly must be welded; (2) Carefully insert the desuperheater into the pipe base; (3) Adjust the water connection end to the most convenient position; (4) Clean and purge the desuperheating water circuit; (5) Connect the desuperheating water circuit.

[0038] Daily inspection of the above-mentioned sleeve-type integrated desuperheater: Under normal operating conditions, the desuperheater is not prone to wear or deformation, but it still needs to be inspected regularly (the desuperheater does not need to be disassembled for inspection), specifically: (1) Remove the bolts and pull the desuperheater out of the steam pipe, and discard the used gasket; (2) Connect the actuator to the temporary air source and signal end and ventilate; (3) Make sure that the desuperheater operates correctly according to the air source signal of the actuator; (4) Connect the temporary water line; (5) Check the nozzle leakage - pressurize the desuperheater to simulate operating conditions; (6) Check the nozzle outlet to make sure that there are no scratches, pits or strains on the sealing surface; (7) Re-insert the desuperheater into the pipe base, install a new gasket, and tighten the bolts; (8) Connect the air source, signal and desuperheating water.

[0039] The disassembly steps of the above-mentioned sleeve-type integrated desuperheater are as follows:

[0040] (1) Disconnect the water and air supply of the desuperheater; (2) Pull out the desuperheater from the pipe base and move it to the workbench; (3) Disassemble the actuator and move the valve core and valve stem upward to avoid damaging the nozzle seat surface; (4) Grind off the locking weld on the nozzle; do not damage the welding groove; (5) Unscrew the nozzle from the straight pipe (i.e., pipe body 3); (6) Remove the sleeve: Check the sealing surface and flow channel hole to see if there are signs of wear, scratches or strain; (7) Pull out the valve core and valve stem from one side of the nozzle (the valve core and valve stem are welded together and cannot be separated); (8) Check the valve core and nozzle sealing surfaces for signs of wear, scratches or strain; (9) Check whether there is any sediment inside the straight pipe. If there is any, clean it up; (10) Remove the packing nut, packing pressure plate, dust ring, packing gland, packing, packing spacer, packing seat and guide sleeve.

[0041] The assembly method of the above-mentioned sleeve-type integrated desuperheater comprises the following steps:

[0042] (a) Use abrasive (silicon carbide) to grind the nozzle 1 and valve plug 2, and carefully wipe off the excess abrasive;

[0043] (b) Insert the valve stem 4 and the valve plug 2 into the support assembly until they are above the closed position, leaving space to prevent the sealing surface from being damaged by collision when installing the nozzle; install the sleeve 5;

[0044] (c) Tighten the nozzle 1 to be installed on the pipe body 3 of the support assembly (note: the valve core must move smoothly, and the valve core assembly and the nozzle are moved up and down to contact and separate, and repeated 3 to 4 times), and weld it (ENiCrFe-2 welding rod, which does not require heat treatment);

[0045] (d) Install the sealing assembly and ensure that there is no leakage on the nozzle sealing surface and nozzle welding point when the nozzle is in the closed position.

[0046] The performance and material usage of the above-mentioned sleeve-type integrated desuperheater are shown in Table 1.

[0047] Table 1 Performance and material usage of sleeve-type integrated desuperheater

[0048]

[0049] The principle of the above sleeve-type integrated desuperheater is as follows: desuperheating water enters the area between the main body inlet and the nozzle from the water pipe; the control valve plug is installed in the nozzle; the sealing surfaces of the nozzle and the control valve plug overlap to ensure tight closure; when the valve plug is in the closed position, all the water injection holes on the sleeve are closed; as the valve plug is lifted from the nozzle base, some water injection holes on the sleeve are opened at the same time; the number of water injection holes released is directly related to the lifting force of the valve plug; from the control point of view, the position of the water injection holes on the sleeve is designed to ensure good flow characteristics; the desuperheating water entering the sleeve through the tangential direction of the water injection holes is guided to rotate rapidly around the valve plug, and then sprayed out through the nozzle into a cone-shaped spray and evaporated rapidly; the amount of desuperheating water sprayed depends on the number and size of the injection holes released by the control valve plug. The signal of the temperature transmitter located downstream of the desuperheater controls the position of the valve plug through the actuator.

[0050] like Figure 3 The application of the sleeve-type integrated desuperheater shown in the figure, the sleeve-type integrated desuperheater 24 and the steam pipeline, temperature sensor 21, temperature transmitter 22, PID controller 23, condensate tank 28 and control thermometer 29 form a steam desuperheating control system. The steam pipe has a superheated steam inlet 26 and a cooling steam inlet 27, the sleeve-type integrated cooler 24 has a cooling water inlet 25 (i.e., the aforementioned main body inlet), and the steam pipe is installed with a temperature sensor 21 extending into the interior thereof, a control thermometer 29 extending into the interior thereof and located downstream of the temperature sensor 21 (the definitions of upstream and downstream are defined according to the flow direction of steam in the steam pipe), and a condensate tank 28 connected to the steam pipe and located downstream of the control thermometer 29. The temperature sensor 21 is also connected to the temperature transmitter 22, and the PID controller 23 is respectively connected to the sleeve-type integrated cooler 24 and the temperature transmitter 22. The angle formed between the sleeve-type integrated cooler 24 and the axis of the steam pipe is an acute angle, the angle formed between the temperature sensor 21 and the axis of the steam pipe is an acute angle, and the control thermometer 29 is perpendicular to the axis of the steam pipe.

[0051] Example 2

[0052] This embodiment provides a sleeve-type integrated desuperheater, such as Figure 4 As shown, it includes a support assembly, a valve stem 4', a sealing assembly and a temperature reduction and adjustment assembly.

[0053] The support assembly includes a tube body 3' and a valve body 6'. A receiving cavity is provided in the tube body 3' (the receiving cavity usually penetrates the tube body 3' and is coaxial with the tube body 3', and the size of the outer end of the receiving cavity is usually larger than the inner portion thereof). One end of the valve body 6' is connected to one end of the tube body 3' and a connecting seat is provided at the other end (the connecting seat is also coaxial with the tube body 3'). A flow channel communicating with the receiving cavity and the connecting seat is provided in the valve body 6' and a water inlet pipe communicating with the flow channel is provided on its side wall. The valve stem 4' is adjustably inserted in the receiving cavity and one end extends to the outside of the connecting seat through the valve body 6'; a conventional pneumatic actuator is installed at one end of the valve stem 4', and the movement of the valve stem 4' is driven by the pneumatic actuator.

[0054] The sealing assembly includes a packing seat 11' installed in the connecting seat and sleeved on the valve stem 4', a packing 8' filled between the connecting seat and the valve stem 4' and located outside the packing seat 11', a packing gland 12' sleeved on the valve stem 4' and abutting against the packing 8', and a packing pressure plate 9' installed at the end of the connecting seat through a connecting member group and sleeved on the valve stem 4' to abut against the packing gland 12'. In this embodiment, the structure of the packing 8' is as follows Figure 5As shown, it is a braided packing. The temperature reduction and adjustment component includes a nozzle 1' (the orifice area of ​​the nozzle is adjustable) installed at the other end of the tube body 3' and a valve plug 2' (also called a valve core) connected to the other end of the valve stem 4' at one end and matched with the nozzle 1' at the other end; the temperature reduction and adjustment component has a first and a second state: when it is in the first state, the other end of the valve plug 2' or its outer wall is in contact and sealed with the nozzle 1'; when it is in the second state, the accommodating chamber is in communication with the nozzle 1'. In this embodiment, the sealing component also includes a guide sleeve 7' installed in the connecting seat and sleeved on the valve stem 4' and a packing spacer 10' sleeved on the valve stem 4' to separate the packing 8', and the packing seat 11' is arranged on the outside of the guide sleeve 7'. The connecting piece group includes a plurality of packing studs 16' connecting the connecting seat and the packing pressure plate 9' and a packing nut 15' correspondingly installed on each packing stud 16'. The sealing assembly also includes a dust ring 13' installed between the packing plate 9' and the valve stem 4' and matched with the packing gland 12', and a bracket nut 14' formed on the outer peripheral surface of the connecting seat and flush with its outer end surface. The temperature reduction and adjustment assembly also includes a sleeve 5' installed in the accommodating cavity and connected to the nozzle 1'. The sleeve 5' is sleeved on the valve plug 2' and has a plurality of water injection holes. The sleeve 5' divides the accommodating cavity into a first cavity and a second cavity; when the temperature reduction and adjustment assembly is in the first state, the sleeve 5' is sealed with the valve plug 2', and the first cavity and the second cavity are not connected; when the temperature reduction and adjustment assembly is in the second state, the sleeve 5' and the valve plug 2' are unsealed, and the first cavity and the second cavity are connected through the water injection holes. In the present embodiment, the main difference from the first embodiment is that the specific shapes of the sleeve 5' and the valve plug 2' are different; in the present embodiment, the valve plug 2 is composed of three sections with different cross-sectional radii connected in sequence (in the direction from the nozzle 1 to the valve stem 4, the cross-sectional radius first decreases and then increases), and the radius of the middle structure is smaller than the radius of the other two structures (the radii of the other two structures are the same), so that the outer surfaces of the other two structures are sealed with the inner wall of the sleeve 5; when the middle structure corresponds to the water injection hole and moves to communicate with the accommodating cavity, the spraying of cooling water is realized.

[0055] Example 3

[0056] This embodiment provides a sleeve-type integrated desuperheater, such as Figure 6 As shown, it is basically similar in structure to Embodiment 2, except that the structures of the nozzle 1", valve plug 2", tube body 3" and valve stem 4" are slightly different, and it does not contain a sleeve.

[0057] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A sleeve-type integrated desuperheater, characterized in that: It includes: A support assembly, the support assembly comprising a tube body (3) and a valve body (6), the tube body (3) having an accommodating cavity therein, one end of the valve body (6) being connected to one end of the tube body (3) and the other end being provided with a connecting seat, the valve body (6) having a flow channel communicating with the accommodating cavity and the connecting seat therein and a water inlet pipe communicating with the flow channel being provided on its side wall; a valve stem (4), the valve stem (4) being adjustably inserted in the accommodating cavity and having one end extending through the valve body (6) to the outside of the connecting seat; A sealing assembly, the sealing assembly comprising a packing seat (11) installed in the connecting seat and sleeved on the valve stem (4), a packing (8) filled between the connecting seat and the valve stem (4) and located outside the packing seat (11), a packing gland (12) sleeved on the valve stem (4) and abutting against the packing (8), and a packing pressure plate (9) installed at the end of the connecting seat through a connecting member group and sleeved on the valve stem (4) to abut against the packing gland (12); A temperature reduction and adjustment component, the temperature reduction and adjustment component comprising a nozzle (1) mounted on the other end of the tube body (3) and a valve plug (2) having one end connected to the other end of the valve stem (4) and the other end matched with the nozzle (1); the temperature reduction and adjustment component has a first and a second state: when it is in the first state, the other end of the valve plug (2) or its outer wall is in contact and sealed with the nozzle (1); when it is in the second state, the accommodating cavity is in communication with the nozzle (1); The temperature reduction and adjustment component further comprises a sleeve (5) installed in the accommodating cavity and connected to the nozzle (1); the sleeve (5) is sleeved on the valve plug (2) and is provided with a plurality of water injection holes; the sleeve (5) divides the accommodating cavity into a first cavity and a second cavity; when the temperature reduction and adjustment component is in a first state, the sleeve (5) and the valve plug (2) are sealed, and the first cavity and the second cavity are not connected; when the temperature reduction and adjustment component is in a second state, the sleeve (5) and the valve plug (2) are released from sealing, and the first cavity and the second cavity are connected through the water injection holes; The valve plug (2) is composed of three sections of structures with different cross-sectional radii connected in sequence. In the direction from the nozzle (1) to the valve stem (4), its cross-sectional radius first decreases and then increases, so that the radius of the middle structure of the valve plug (2) is smaller than the radius of the remaining two sections, and the outer surfaces of the remaining two sections are sealed with the inner wall of the sleeve (5).

2. The sleeve-type integrated desuperheater according to claim 1, characterized in that: The sealing assembly further comprises a guide sleeve (7) installed in the connecting seat and sleeved on the valve stem (4), and a packing spacer (10) sleeved on the valve stem (4) to separate the packing (8), and the packing seat (11) is arranged on the outside of the guide sleeve (7).

3. The sleeve-type integrated desuperheater according to claim 1, characterized in that: The connecting component group comprises a plurality of packing studs (16) connecting the connecting seat and the packing pressure plate (9), and a packing nut (15) correspondingly mounted on each of the packing studs (16).

4. The sleeve-type integrated desuperheater according to claim 1, characterized in that: The sealing assembly further comprises a dust ring (13) installed between the packing pressure plate (9) and the valve stem (4) and cooperating with the packing gland (12), and a bracket nut (14) formed on the outer peripheral surface of the connecting seat and flush with its outer end surface.

5. The sleeve-type integrated desuperheater according to claim 1, characterized in that: The orifice area of ​​the nozzle is adjustable.

6. The sleeve-type integrated desuperheater according to claim 1, characterized in that: The filler (8) is a graphite filler or a braided filler.

7. The method for assembling the sleeve-type integrated desuperheater according to any one of claims 1 to 6, characterized in that: It includes the following steps: (a) grinding the nozzle (1) and the valve plug (2) using an abrasive; (b) inserting the valve stem (4) and the valve plug (2) into the support assembly until they are above the closed position, leaving space; (c) screwing the nozzle (1) to be mounted on the tube body (3) of the support assembly and welding it; (d) Install the sealing assembly and ensure that there is no leakage on the nozzle sealing surface and nozzle welding point when the nozzle is in the closed position.

8. The assembly method of the sleeve-type integrated desuperheater according to claim 1, characterized in that: In step (c), the valve plug (2) is also moved so as to make multiple up-and-down movements of contact and separation with the nozzle (1) before being welded.

9. Application of the sleeve-type integrated desuperheater according to any one of claims 1 to 6, characterized in that: The sleeve-type integrated desuperheater (24) and the steam pipeline, the temperature sensor (21), the temperature transmitter (22), the PID controller (23), the condensate tank (28) and the control thermometer (29) form a steam desuperheating control system. The steam pipeline has a superheated steam inlet (26) and a desuperheated steam inlet (27). The sleeve-type integrated desuperheater (24) has a desuperheated water inlet (25). The steam pipeline is provided with a temperature sensor (21) extending into the interior thereof, a control thermometer (29) extending into the interior thereof and located downstream of the temperature sensor (21), and a control thermometer (29) connected to the steam pipeline. A condensate tank (28) connected to a steam pipeline and located downstream of the control thermometer (29), the temperature sensor (21) is also connected to the temperature transmitter (22), the PID controller (23) is respectively connected to the sleeve-type integrated desuperheater (24) and the temperature transmitter (22), the angle formed between the sleeve-type integrated desuperheater (24) and the axis of the steam pipeline is an acute angle, the angle formed between the temperature sensor (21) and the axis of the steam pipeline is an acute angle, and the control thermometer (29) is perpendicular to the axis of the steam pipeline.

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