Self-adjusting multistage nozzle ultrahigh pressure steam desuperheater

Abstract

A self-adjusting multistage nozzle ultrahigh pressure steam desuperheater relates to the field of desuperheaters, and comprises a desuperheater cylinder, the desuperheater cylinder is provided with a steam channel, the desuperheater cylinder is respectively provided with a steam inlet and a steam outlet at two ends of the steam channel, and the steam inlet is positioned below the steam outlet; the nozzle barrel is arranged in the steam channel of the desuperheater barrel, the nozzle barrel is provided with a middle through hole for steam to pass through, a desuperheating water cavity is arranged in the nozzle barrel and is communicated with an external desuperheating water source, the nozzle barrel is provided with a plurality of rows of nozzle channels on the surface of the middle through hole, and each row of nozzle channels are uniformly distributed in the circumferential direction of the middle through hole; the desuperheating water cavity is communicated with the middle through hole; the valve element is arranged in the steam channel of the desuperheater barrel in a sliding mode and located on the side, away from the steam inlet, of the nozzle barrel. When the valve element makes contact with the conical face of the end of the nozzle barrel, the middle through hole is blocked. Steam flow change can be automatically adapted, the wall surface of the desuperheater can be protected, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of desuperheaters and relates to a self-regulating multi-stage nozzle ultra-high-pressure steam desuperheater structure, which is generally used in ultra-high-pressure steam pipelines of cracking furnaces and can also be applied to other ultra-high-pressure steam pipelines. Background Art

[0002] In actual production, in order to avoid damage caused by superheated steam parameters exceeding the tolerance range of the user end, a desuperheater is required to convert the steam temperature into the parameters required by the engineering site, improve the steam thermal efficiency, and extend the service life of the equipment.

[0003] Desuperheaters used in cracking furnaces are characterized by high steam operating pressures and temperatures. Steam production fluctuates significantly during the cracking furnace's hot standby, initial and final stages, feeding, and coking operations. This requires a wide flow control range for the desuperheater, meeting both the minimum and maximum possible desuperheating water flow rates. To prevent damage to furnace tubes from excessively high temperatures during these operating conditions, the desuperheater's flow control must be sensitive.

[0004] Existing desuperheaters typically employ a larger number of nozzles to accommodate high steam and cooling water flow rates. However, under low steam flow conditions, multiple nozzles can lead to poor atomization due to low steam velocity, resulting in liquid inclusion in the outlet steam and unstable temperature, failing to meet process requirements. Furthermore, under ultra-high-pressure steam conditions, the desuperheater wall is susceptible to damage from cavitation.

[0005] The desuperheaters currently available on the market cannot automatically adapt to ultra-high pressure steam conditions with a large flow rate variation range. Therefore, it is necessary to design an automatically adjustable desuperheater suitable for ultra-high pressure steam to solve the above technical problems. Summary of the Invention

[0006] The technical problem solved by the present application is: to overcome the deficiencies of the prior art and provide a self-adjusting multi-stage nozzle ultra-high pressure steam desuperheater that can automatically adapt to changes in steam flow, protect the desuperheater wall surface, and increase the life of the equipment.

[0007] The technical solutions provided in this application are as follows:

[0008] A self-regulating multi-stage nozzle ultra-high pressure steam desuperheater, comprising:

[0009] The desuperheater cylinder is provided with a steam passage. The desuperheater cylinder has a steam inlet and a steam outlet at both ends of the steam passage, and the steam inlet is located below the steam outlet.

[0010] The nozzle cylinder is arranged in the steam channel of the desuperheater cylinder. The nozzle cylinder is provided with a central through hole for steam to pass through. A desuperheating water chamber is provided in the nozzle cylinder. The desuperheating water chamber is connected to an external desuperheating water source. The nozzle cylinder is provided with multiple rows of nozzle channels on the surface of the central through hole. Each row of nozzle channels is evenly distributed along the circumference of the central through hole. The desuperheating water chamber is connected to the desuperheating water chamber and the central through hole.

[0011] The valve core is slidably arranged in the steam channel of the desuperheater cylinder and is located on the side of the nozzle cylinder away from the steam inlet; when the valve core contacts the conical surface of the end of the nozzle cylinder, the middle through hole is blocked.

[0012] Furthermore, the end of the valve core facing the nozzle barrel is a conical structure; the end face of the nozzle barrel close to the valve core is provided with a chamfer, the chamfer forms a conical surface, and the conical surface fits the outer surface of the valve core; the outer diameter of the valve core is larger than the end diameter of the middle through hole of the nozzle barrel close to the valve core.

[0013] Furthermore, along the steam flow direction, the middle through hole of the nozzle cylinder includes a tapered cylinder section and a straight cylinder section with gradually decreasing inner diameters.

[0014] Furthermore, the nozzle channel includes a primary nozzle channel, a secondary nozzle channel and / or a tertiary nozzle channel, the primary nozzle channel is arranged at the conical surface position, the secondary nozzle channel is arranged at the straight cylinder section, and the tertiary nozzle channel is arranged at the conical cylinder section.

[0015] Furthermore, the ratio of the cooling water flow rate required under the minimum steam flow rate and the maximum steam flow rate in the desuperheater cylinder is below 1:20, and the nozzle channel only adopts the first-level nozzle channel; the ratio of the cooling water flow rate required under the minimum steam flow rate and the maximum steam flow rate in the desuperheater cylinder is between 1:20 and 1:30, and the nozzle channel adopts the first-level nozzle channel and the second-level nozzle channel; the ratio of the cooling water flow rate required under the minimum steam flow rate and the maximum steam flow rate in the desuperheater cylinder is between 1:30 and 1:40, and the nozzle channel adopts the first-level nozzle channel, the second-level nozzle channel and the third-level nozzle channel.

[0016] Furthermore, when the nozzle channel further includes a fourth-stage nozzle channel, the fourth-stage nozzle channel is arranged in the cone section.

[0017] Furthermore, a first steam channel is formed between the nozzle cylinder and the inner wall of the desuperheater cylinder; the steam entering through the steam inlet also enters the first steam channel when entering the middle through hole provided in the nozzle cylinder.

[0018] Furthermore, it also includes an automatic regulating valve body and a valve limiting cylinder. The automatic regulating valve body is fixedly arranged in the steam channel of the desuperheater cylinder, and the valve limiting cylinder is fixedly connected to the automatic regulating valve body. There is a mixing flow channel between the outer wall surface of the valve limiting cylinder and the inner wall surface of the automatic regulating valve body, and there is a distance between the valve limiting cylinder and the nozzle cylinder; the valve core is slidably connected to the valve limiting cylinder, and the upper end of the valve limiting cylinder limits the distance the valve core slides upward; the steam flowing out of the middle through hole passes through the gap between the nozzle cylinder and the limiting valve core and the valve limiting cylinder and enters the mixing flow channel, and finally flows out from the steam outlet.

[0019] Furthermore, a second steam channel is formed between the outer wall surface of the automatic regulating valve body and the inner wall surface of the desuperheater cylinder; the first steam channel and the second steam channel are communicated.

[0020] Furthermore, a cooling water pipe is provided on the side of the cooler cylinder, the cooling water pipe passes through the wall of the nozzle cylinder and is connected with the cooling water cavity, and the cooling water flows into the cooling water cavity from the cooling water pipe.

[0021] The self-regulating multi-stage nozzle ultra-high-pressure steam desuperheater features an automatic regulating valve body within the desuperheater housing. A valve stopper is located within the desuperheater housing, forming a steam passage between the outer side of the valve stopper and the desuperheater housing. The valve stopper is slidably connected to a valve core within the valve stopper. A nozzle body is located at the lower end of the automatic regulating valve body, securing the valve stopper. A steam passage is formed between the outer side of the nozzle body and the desuperheater housing. A desuperheating water chamber is defined within the nozzle body, with nozzle channels uniformly distributed circumferentially along the inner wall. A desuperheating water pipe is installed on the side of the desuperheater housing, passing through the wall of the desuperheater housing and communicating with the desuperheating water chamber.

[0022] Further in accordance with any one or more of the aforementioned exemplary aspects of the present invention, the nozzle channel may also include any one or more of the following preferred forms in any combination.

[0023] In a preferred form, the nozzle channel includes 4-30 primary nozzle channels and 4-30 secondary nozzle channels, the primary nozzle channel is located above the secondary nozzle channel, and the primary nozzle channel and the secondary nozzle channel form different angles with the axis of the desuperheater cylinder.

[0024] In another preferred embodiment, the nozzle channel includes 4-30 primary nozzle channels, 4-30 secondary nozzle channels, and 4-30 tertiary nozzle channels, wherein the secondary nozzle channels are located above the tertiary nozzle channels. The primary nozzle channels, the secondary nozzle channels, and the tertiary nozzle channels form different angles with the axis of the desuperheater barrel.

[0025] In summary, this application has at least the following beneficial technical effects:

[0026] The present invention provides a sliding valve core in the automatic regulating valve body to adjust the effective flow area of the steam flow channel as the steam flow rate changes, maintain the steam flow rate, keep the cooling water atomization effect stable, without entraining droplets and maintain a stable steam outlet temperature.

[0027] The present invention provides a multi-stage nozzle channel with uniform annular distribution on the inner wall surface, and adjusts the cooling water to meet the cooling capacity required by the user under the working condition of a large range of steam flow changes.

[0028] The present invention forms a steam channel between the outer side of the valve limit cylinder, the outer side of the nozzle cylinder and the desuperheater cylinder, thereby isolating desuperheated water droplets from damaging the desuperheater cylinder wall due to cavitation, thereby improving the service life of the equipment.

[0029] The present invention has a simple and reliable structure, reduces the number of welds on the desuperheater cylinder, and avoids leakage of ultra-high-pressure steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of a self-regulating multi-stage nozzle ultra-high pressure steam desuperheater.

[0031] Figure 2 Schematic diagram of the automatic regulating valve body.

[0032] Figure 3 Schematic diagram of the nozzle barrel.

[0033] Figure 4 for Figure 3 AA cross-section diagram.

[0034] Description of reference numerals:

[0035] 1-Desuperheater cylinder; 2-Automatic regulating valve body; 3-Valve limit cylinder; 4-Steam channel; 5-Valve core; 6-Nozzle cylinder; 7-Desuperheating water chamber; 8-Desuperheating water pipe; 9-First-stage nozzle channel; 10-Second-stage nozzle channel; 11-Third-stage nozzle channel; 12-Steam outlet; 13-Steam inlet. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of this application clearer, the embodiments disclosed in this application will be described in further detail below with reference to the accompanying drawings.

[0037] The present application discloses a self-regulating multi-stage nozzle ultra-high pressure steam desuperheater. Figure 1 : is a schematic structural diagram of a self-regulating multi-stage nozzle ultra-high pressure steam desuperheater provided by an embodiment of the present invention, such as Figure 1As shown, the desuperheater comprises a desuperheater cylinder 1, which is internally provided with a steam passage. The steam passage is provided at both ends of the desuperheater cylinder 1, respectively, with a steam inlet 13 and a steam outlet 12. A nozzle cylinder 6 and an automatic regulating valve body 2 are fixedly disposed in sequence within the steam passage of the desuperheater cylinder 1, in a direction from the steam inlet 13 to the steam outlet 12.

[0038] like Figure 2 As shown, the steam passage of the desuperheater barrel 1 is fixedly connected to an automatic regulating valve body 2. A steam passage 4 is formed between the outer wall of the automatic regulating valve body 2 and the inner wall of the desuperheater barrel 1. A valve limiting cylinder 3 is fixedly connected to the automatic regulating valve body 2. A mixing flow passage is formed between the outer wall of the valve limiting cylinder 3 and the inner wall of the automatic regulating valve body 2. There is a distance between the valve limiting cylinder 3 and the nozzle barrel 6. The valve core 5 is slidably connected to the inner side of the valve limiting cylinder 3. The upper end of the valve limiting cylinder 3 limits the upward sliding distance of the valve core 5. The end of the valve core 5 facing the nozzle barrel 6 is a tapered structure. The nozzle barrel 6 is provided with a central through hole for steam to pass through. When the valve core 5 moves to contact the end of the nozzle barrel 6, it blocks the end of the central through hole.

[0039] The valve core 5 and the nozzle barrel 6 form a mixed flow channel for cooling water and ultra-high pressure steam. The upward sliding distance of the valve core 5 can be determined according to the flow velocity of the steam passing through the mixed flow channel under the maximum flow condition of ultra-high pressure steam. Usually, the flow velocity of the steam is between 25 and 45 m / s.

[0040] like Figure 3 and Figure 4 As shown, the nozzle barrel 6 and the inner side of the desuperheater barrel 1 form a steam passage 4. A desuperheating water chamber 7 is provided within the nozzle barrel 6. A circumferentially uniformly distributed first-stage nozzle channel 9 is provided on the surface of the central through-hole of the nozzle barrel 6. The first-stage nozzle channel 9 connects the desuperheating water chamber 7 and the central through-hole. The first-stage nozzle channel 9 forms an angle with the axis of the desuperheater barrel 1, and the desuperheated water in the desuperheating water chamber 7 is ejected obliquely upward through the first-stage nozzle channel 9. A circumferentially uniformly distributed second-stage nozzle channel 10 is provided at the lower end of the first-stage nozzle channel 9. The second-stage nozzle channel 10 is aligned radially with the desuperheater barrel 1, and the desuperheated water in the desuperheating water chamber 7 is ejected horizontally through the second-stage nozzle channel 10. A circumferentially uniformly distributed third-stage nozzle channel 11 is provided at the lower end of the second-stage nozzle channel 10. The third-stage nozzle channel 11 forms an angle with the axis of the desuperheater barrel 1, and the desuperheated water in the desuperheating water chamber 7 is ejected obliquely downward through the third-stage nozzle channel 11.

[0041] In some embodiments provided by the present invention, the number of nozzle channels can be determined based on the required cooling water flow ratio under the minimum flow and maximum flow conditions of ultra-high pressure steam. Generally, a first-stage nozzle channel is used when the cooling water flow ratio is below 1:20, a two-stage nozzle channel, i.e., a first-stage and a second-stage nozzle channel, is used when the cooling water flow ratio is between 1:20 and 1:30, and a three-stage nozzle channel, i.e., a first-stage, a second-stage and a third-stage nozzle channel, is used when the cooling water flow ratio is between 1:30 and 1:40.

[0042] Along the direction of steam flow, the central through hole of the nozzle barrel 6 includes a tapered section and a straight section with gradually decreasing inner diameters. This arrangement is conducive to increasing the steam flow rate, thereby enhancing the inertial force, better overcoming the surface tension of the droplets, increasing the Weber number and reducing the droplet size, thereby increasing the heat exchange area between the atomized droplets and the steam and improving the cooling efficiency. At the same time, the inner diameter of the tapered section gradually decreases, the steam pressure decreases, and an additional pressure head can be formed for the cooling water to be sprayed into the steam, thereby expanding the working pressure range of the cooling water at the nozzle. The nozzle barrel 6 is provided with a chamfer on the end face of the straight section close to the valve core 5. The chamfer forms a conical surface, which fits the outer surface of the valve core 5 so that there is a larger contact area when the valve core 5 contacts the nozzle barrel 6, thereby being able to block the steam channel in the middle of the steam nozzle barrel 6.

[0043] A cooling water pipe 8 is provided on the side of the desuperheater shell 1 , and the cooling water pipe 8 passes through the wall of the nozzle cylinder 6 and is connected to the cooling water chamber 7 , and the cooling water flows from the cooling water pipe 8 into the cooling water chamber 7 .

[0044] The lower end of the desuperheater shell 1 is a steam inlet 13, and the upper end of the desuperheater shell 1 is a steam outlet 12. Ultra-high-pressure steam enters the desuperheater shell 1 from the steam inlet 13, part of the steam passes through the steam channel 4, and the other part of the steam is mixed with the desuperheating water ejected from the third-stage nozzle channel 11, the second-stage nozzle channel 10, and the first-stage nozzle channel 9 in sequence. The steam flowing out of the steam channel 4 and the upper end of the automatic regulating valve body 2 is fully mixed and then flows out from the steam outlet 12.

[0045] Steam enters from the steam inlet 13, and part of the steam mixes with the cooling water in the nozzle cylinder 6 to form a mixed fluid. The mixed fluid enters the mixed flow channel through the gap between the nozzle cylinder 6 and the limiting valve core 5 and the valve limit cylinder 3, and finally flows out from the steam outlet 12 after passing through the mixed flow channel; part of the steam enters the steam channel 4 and finally flows out from the steam outlet 12.

[0046] The working principle of the present invention is as follows: cooling water enters the cooling water chamber 7 in the nozzle barrel 6 through the cooling water pipe 8, and the cooling water is ejected through the nozzle channel on the wall of the cooling water chamber 7 to mix with the ultra-high-pressure steam. When the ratio of the minimum steam flow rate to the maximum steam flow rate, that is, the adjustment ratio, is large, the cooling water is simultaneously ejected from the annularly evenly distributed first-stage nozzle channel, second-stage nozzle channel, and third-stage nozzle channel at different angles, such as upward, horizontal, and downward. A portion of the ultra-high-pressure steam flowing in from the steam inlet enters the steam channel between the automatic regulating valve body 2, the nozzle barrel 6, and the desuperheater barrel 1, protecting the desuperheater barrel 1 from damage by droplet cavitation, thereby increasing the service life of the desuperheater. Moreover, when the movement of the valve core 5 is obstructed or the steam flow rate is very small, the steam channel 4 can maintain the pressure in the desuperheater stable. The other part of the ultra-high pressure steam flowing in from the steam inlet 13 passes through the inner flow channel of the nozzle cylinder 6, and is first mixed with the cooling water sprayed from the third-stage nozzle channel, and then sequentially mixed with the cooling water sprayed from the second-stage nozzle channel and the first-stage nozzle channel. The cooling water is sprayed in different directions through the nozzle channel, and fully exchanges heat in countercurrent with the ultra-high pressure steam and evaporates to cool it. The mixed steam flows out of the nozzle barrel 6 and passes through the mixed steam channel formed by the nozzle barrel 6 and the valve core 5. When the steam flow rate is large, the valve core 5 slides upward under the steam force, the steam flow area increases, and the flow rate decreases. When the gravity and steam force acting on the valve core 5 are balanced, the valve core 5 opening is stable. When the flow rate is small, the valve core 5 slides downward under the gravity, the steam flow area decreases, the flow rate increases, and the steam force acting on the valve core 5 increases. When the gravity and steam force acting on the valve core 5 are balanced, the valve core opening is stable again. When the flow rate changes, the mixed steam flow rate in the mixed steam channel fluctuates within a certain range. The stable steam flow rate helps to ensure that the Weber number is not affected by the steam flow rate, and the desuperheating water atomization effect is always maintained, that is, the heat exchange effect of the desuperheater under variable operating conditions. After flowing out of the mixed steam channel, the mixed steam enters the mixed steam channel formed by the valve limit barrel 3 and the automatic regulating valve 2 body. Because the automatic regulating valve body 2 is heated by the ultra-high-pressure steam on the outer wall at the same time, damage caused by thermal stress on the inner and outer walls is avoided. After the mixed steam flows out through the automatic regulating valve body 2, it mixes with the ultra-high-pressure steam in the steam channel 4. The mixing with the ultra-high-pressure steam here can avoid the generation of droplets on the wall of the desuperheater shell, protecting the equipment wall. The steam discharged through the steam outlet can avoid liquid inclusion, meeting user requirements.

[0047] The contents not described in detail in this application specification are common knowledge to those skilled in the art.

[0048] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A self-adjusting multi-stage nozzle ultra-high pressure steam desuperheater, characterized by: include: A desuperheater cylinder (1), wherein the desuperheater cylinder (1) is provided with a steam passage, and the desuperheater cylinder (1) has a steam inlet (13) and a steam outlet (12) at both ends of the steam passage, and the steam inlet (13) is located below the steam outlet (12); The nozzle barrel (6) is arranged in the steam passage of the desuperheater barrel (1), the nozzle barrel (6) is provided with a central through hole for steam to pass through, a cooling water chamber (7) is provided in the nozzle barrel (6), the cooling water chamber (7) is connected to an external cooling water source, the nozzle barrel (6) is provided with multiple rows of nozzle channels on the surface of the central through hole, each row of nozzle channels is evenly distributed along the circumference of the central through hole, and the cooling water chamber (7) is connected to the cooling water chamber (7) and the central through hole; The valve core (5) is slidably arranged in the steam passage of the desuperheater cylinder (1) and is located on the side of the nozzle cylinder (6) away from the steam inlet (13); when the valve core (5) contacts the conical surface of the end of the nozzle cylinder (6), the middle through hole is blocked.

2. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 1, characterized in that: The end of the valve core (5) facing the nozzle barrel (6) is a tapered structure; the end surface of the nozzle barrel (6) close to the valve core (5) is provided with a chamfer, and the chamfer forms a tapered surface, which fits the outer surface of the valve core (5); the outer diameter of the valve core (5) is larger than the diameter of the end of the nozzle barrel (6) close to the middle through hole of the valve core (5).

3. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 2, characterized in that: Along the steam flow direction, the central through hole of the nozzle barrel (6) includes a tapered barrel section and a straight barrel section with gradually decreasing inner diameters.

4. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 3, characterized in that: The nozzle channel comprises a primary nozzle channel (9), a secondary nozzle channel (10) and / or a tertiary nozzle channel (11); the primary nozzle channel (9) is arranged at a conical surface position, the secondary nozzle channel (10) is arranged at a straight cylinder section, and the tertiary nozzle channel (11) is arranged at a conical cylinder section.

5. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 4, characterized in that: The ratio of the desuperheating water flow required under the minimum steam flow rate to the maximum steam flow rate in the desuperheater cylinder (1) is below 1:20, and the nozzle channel only uses the first-level nozzle channel (9); the ratio of the desuperheating water flow required under the minimum steam flow rate to the maximum steam flow rate in the desuperheater cylinder (1) is between 1:20 and 1:30, and the nozzle channel uses the first-level nozzle channel (9) and the second-level nozzle channel (10); the ratio of the desuperheating water flow required under the minimum steam flow rate to the maximum steam flow rate in the desuperheater cylinder (1) is between 1:30 and 1:40, and the nozzle channel uses the first-level nozzle channel (9), the second-level nozzle channel (10), and the third-level nozzle channel (11).

6. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 3, characterized in that: When the nozzle channel further includes a fourth-level nozzle channel, the fourth-level nozzle channel is arranged in the cone section.

7. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 1, characterized in that: A first steam channel is formed between the nozzle barrel (6) and the inner wall surface of the desuperheater barrel (1); the steam entering through the steam inlet (13) also enters the first steam channel when entering the middle through hole provided in the nozzle barrel (6).

8. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 7, characterized in that: The invention also includes an automatic regulating valve body (2) and a valve limiting cylinder (3), wherein the automatic regulating valve body (2) is fixedly arranged in the steam channel of the desuperheater cylinder (1), the valve limiting cylinder (3) is fixedly connected to the automatic regulating valve body (2), a mixed flow channel is provided between the outer wall surface of the valve limiting cylinder (3) and the inner wall surface of the automatic regulating valve body (2), and a distance is provided between the valve limiting cylinder (3) and the nozzle cylinder (6); the valve core (5) is slidably connected to the valve limiting cylinder (3), and the upper end of the valve limiting cylinder (3) limits the distance of the valve core (5) sliding upward; the steam flowing out of the middle through hole enters the mixed flow channel after passing through the gap between the nozzle cylinder (6) and the limiting valve core (5) and the valve limiting cylinder (3), and finally flows out from the steam outlet (12).

9. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 8, characterized in that: A second steam channel is formed between the outer wall surface of the automatic regulating valve body (2) and the inner wall surface of the desuperheater cylinder (1); the first steam channel and the second steam channel are in communication.

10. The self-regulating multi-stage nozzle ultra-high pressure steam desuperheater according to claim 1, characterized in that: A cooling water pipe (8) is provided on the side of the cooler cylinder (1), and the cooling water pipe (8) passes through the wall of the nozzle cylinder (6) and is connected to the cooling water chamber (7), and the cooling water flows from the cooling water pipe (8) into the cooling water chamber (7).

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