desuperheater

Abstract

The utility model provides a desuperheater relates to the technical field of desuperheater and desuperheater, include: mix temperature main pipe, inner sleeve and atomization nozzle, the inner sleeve is connected in the inside of mix temperature main pipe, and both are interval arrangement in radial, the inner sleeve includes inner sleeve body and slit seal strip, is provided with the slit of from its import end to export end extension on the lateral wall of inner sleeve body, the cross section of slit seal strip is groove shape, one side of the opening back surface of slit seal strip is connected with one side of the slit, and the other side of the slit is inserted into the opening inboard of slit seal strip to form sealed connection, be provided with first mounting hole on mix temperature main pipe, be provided with second mounting hole on slit seal strip, after the atomization nozzle passes first mounting hole and second mounting hole, insert into the inboard of inner sleeve.

Description

Technical Field

[0001] This utility model relates to the field of de-cooling and pressure reducing devices, and in particular to a de-cooling device. Background Technology

[0002] In industries such as energy, chemical, and power, desuperheaters and pressure reducers are key thermal equipment, responsible for rapidly reducing high-temperature, high-pressure steam to the required temperatures and pressures for the process. However, under high-temperature and high-pressure conditions, the desuperheater's water atomization system struggles to adapt to large-gradient cooling requirements, resulting in uneven atomization. This unevenness is exacerbated, especially during transient load fluctuations or flow regulation, leading to alternating periods of localized undercooling and high temperature within the mixing tube. This creates a severe transient thermal stress gradient, posing a serious challenge to the stable and safe operation of the desuperheater.

[0003] While existing technologies attempt to alleviate the aforementioned problems by optimizing nozzle orifice diameter, increasing the number of atomization stages, or improving the mixing tube material, they fail to fundamentally solve the challenge of coordinating atomization uniformity and thermal stress control under dynamic operating conditions. To ensure the long-term effective operation of the pressure regulator, a common practice is to add an inner sleeve to the pipe at the nozzle atomization point to protect the power pipeline. However, while adding the inner sleeve delays water corrosion of the steam pipeline, the existing structure and installation methods of the inner sleeve still fail to fundamentally solve the secondary stress problem caused by uneven atomization.

[0004] Traditional solutions involve welding or bolting to install independently prefabricated high-temperature alloy inner sleeves inside the mixing pipe, with the sleeve rigidly connected to the base. Due to the difference in thermal expansion between the inner and outer pipes and uneven atomization of water sprayed inside the sleeve, the interface stress increases dramatically at high temperatures, which can easily lead to axial / circumferential deformation or local cracking of the sleeve. Utility Model Content

[0005] The purpose of this invention is to provide a desuperheater to alleviate the technical problem of annular stress in existing inner sleeves.

[0006] The present invention provides a desuperheater, comprising: a mixing main pipe, an inner sleeve, and an atomizing nozzle;

[0007] The inner sleeve is connected inside the mixing main tube, and the two are spaced apart radially.

[0008] The inner sleeve includes an inner sleeve body and a slit sealing strip. A slit extending from its inlet end to its outlet end is provided on the side wall of the inner sleeve body.

[0009] The cross-section of the gap sealing strip is groove-shaped; one side forming the gap is connected to the back side of the opening of the gap sealing strip, and the other side forming the gap extends into the inside of the opening of the gap sealing strip to form a sealed connection.

[0010] The mixing main pipe is provided with a first mounting hole, the gap sealing strip is provided with a second mounting hole, and the atomizing nozzle extends into the inner side of the inner sleeve after passing through the first mounting hole and the second mounting hole.

[0011] Furthermore, the inlet end of the inner sleeve is flexibly connected to the mixing main pipe; the outlet end of the inner sleeve is slidably connected to the mixing main pipe along the axial direction of the inner sleeve.

[0012] Furthermore, along the direction from the inlet end to the outlet end of the mixing pipe, the inner wall of the mixing pipe is provided with fixed flow guide rings and sealing grooves spaced apart along the axial direction, and the opening of the sealing groove faces the fixed flow guide rings.

[0013] The inlet end of the inner sleeve is connected to an end sealing ring that protrudes outward in the circumferential direction. The outer circumferential end of the end sealing ring is provided with a skirt extending toward the outlet end of the inner sleeve. The skirt and the outer wall of the inner sleeve are radially spaced apart.

[0014] The end sealing ring is located between the fixed flow guide ring and the sealing groove, and the skirt extends into the inside of the opening of the sealing groove. The fixed flow guide ring prevents the skirt from coming out of the opening of the sealing groove.

[0015] Furthermore, the fixed flow guide ring has an inclined surface facing the inlet end of the mixing main pipe, and the inclined surface is inclined towards the outlet end in the direction from the inlet end of the mixing main pipe to the outlet end.

[0016] Furthermore, a guide support block is provided on the side wall of the outlet end of the inner sleeve;

[0017] The inner wall of the mixing main pipe is provided with a sliding guide bracket slot that is slidably connected to the guide support block, so as to restrict the guide support block to slide only along the axial direction.

[0018] Furthermore, the cross-sections of the sliding guide bracket slot and the guide support block are both "T" shaped.

[0019] Furthermore, a sliding support block is provided on the side wall of the outlet end of the inner sleeve, and the sliding support block is in contact with the inner wall of the mixing main pipe.

[0020] Furthermore, there are multiple sliding support blocks, and at least two sliding support blocks are symmetrically arranged relative to the inner sleeve body.

[0021] Furthermore, the atomizing nozzle includes an atomizing nozzle head, a water spray guide tube, and an adjustment system connecting flange connected in sequence;

[0022] The regulating system connection flange is used to connect to an external water source;

[0023] The water spray pipe passes through the first mounting hole and the second mounting hole.

[0024] The outlet of the atomizing nozzle faces the outlet end of the inner sleeve.

[0025] Furthermore, the mixing main pipe is welded to the fixed flow guide ring and the sealing groove respectively.

[0026] This utility model has at least the following advantages or beneficial effects:

[0027] This utility model provides a desuperheater, comprising: a mixing main pipe, an inner sleeve, and an atomizing nozzle; the inner sleeve is connected inside the mixing main pipe, and the two are radially spaced apart; the inner sleeve includes an inner sleeve body and a slit sealing strip, a slit extending from its inlet end to its outlet end is provided on the side wall of the inner sleeve body, and the slit sealing strip has a groove-shaped cross-section; one side forming the slit is connected to one side of the back of the opening of the slit sealing strip, and the other side forming the slit extends into the inside of the opening of the slit sealing strip to form a sealed connection; the mixing main pipe is provided with a first mounting hole, the slit sealing strip is provided with a second mounting hole, and the atomizing nozzle extends into the inside of the inner sleeve after passing through the first mounting hole and the second mounting hole.

[0028] When high-temperature steam enters the desuperheater after being depressurized by the pressure reducing valve, the steam flows into the slotted stress-absorbing inner sleeve. The desuperheating water atomizing nozzle extends into the inner sleeve. Uneven water atomization creates a temperature difference between the top and bottom, causing uneven expansion of the inner sleeve. This expansion is absorbed by the stress-absorbing slots on the inner sleeve, reducing circumferential stress. Furthermore, when the main steam flows through the slotted stress-absorbing inner sleeve, a small pressure difference is created in the annular cavity between the inner sleeve and the mixing main pipe, ensuring the flow of low-temperature steam within the annular cavity and preventing water accumulation and impact at the bottom of the annular cavity. Ultimately, this prevents cracks or even breakage of the mixing main pipe and inner sleeve due to secondary stress, improving the reliability and service life of the desuperheater. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 A longitudinal sectional view of the desuperheater provided in an embodiment of this utility model;

[0031] Figure 2 for Figure 1 A cross-sectional view along the AA direction;

[0032] Figure 3 for Figure 1 A magnified view of the area at position M.

[0033] Icons: 11-Mixing main pipe; 12-Sealing groove; 13-Fixed guide ring; 14-Sliding guide bracket groove; 21-Inner sleeve body; 221-End sealing ring; 222-Skirt; 23-Sliding support block; 24-Guide support block; 25-Gap sealing strip; 31-Atomizing nozzle; 32-Water spray guide pipe; 33-Regulating system connection flange. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0036] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0037] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0038] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0039] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] This utility model provides a flexible, slit-type sleeve technology for desuperheaters, characterized by its simple structure, convenient assembly, and strong resistance to alternating stress. This technology prevents the risk of longitudinal cracks caused by increased circumferential stress in the inner sleeve due to poor water atomization. It also solves the problems of short protection cycles and difficult maintenance associated with traditional sleeve-type desuperheaters.

[0041] like Figures 1-3 As shown, the desuperheater includes: a mixing main pipe 11, an inner sleeve, and an atomizing nozzle.

[0042] For ease of assembly, the mixing main pipe 11 includes a main body section and a sealing groove 12 fixed to the left end of the main body section, a fixing ring, and a sliding groove for the inner sleeve guide bracket at the right end.

[0043] The mixing main pipe 11 is equipped with a slotted stress-absorbing inner sleeve. The inner sleeve adopts a split structure, consisting of an inner sleeve body 21, an end sealing ring 221, a sliding support block 23, a guide support block 24, and a slot sealing strip 25 (such as a labyrinth sealing strip), which are welded together. A U-shaped second mounting hole is pre-drilled in the slot sealing strip 25 for the atomizing nozzle to pass through. A longitudinally penetrating stress-absorbing slot is provided at the upper part of the inner sleeve body 21, and a labyrinth sealing strip is installed at the stress-absorbing slot to ensure absorption of circumferential stress while reducing radial steam leakage. Simultaneously, when the main steam passes through the inner sleeve, a slight pressure difference is formed at the absorption slot, ensuring the reverse flow of low-temperature steam in the annular cavity between the sleeve and the mixing main pipe 11, preventing the external mixing main pipe 11 from overheating.

[0044] The atomizing nozzle passes through the mixing main pipe 11 and the inner sleeve from the inside out. The desuperheating water atomizing nozzle adopts a split structure, consisting of an atomizing nozzle 31, a water spray guide pipe 32, and a regulating system connecting flange 33, which are welded together. The water spray atomization direction is consistent with the steam flow of the inner sleeve.

[0045] During the overall assembly, the gap sealing strip 25 is first welded to one side of the gap in the inner sleeve body 21, with the other side of the gap extending into the opening of the gap sealing strip 25. Due to the presence of the gap, the inner sleeve body 21 can deform circumferentially when subjected to internal pressure, thereby releasing radial stress. The sliding support block and the guide support block 24 are then welded to the sliding end (right end) of the inner sleeve body 21, completing the gap-type inner sleeve assembly. The guide support block 24 is located directly below the gap, and there are two sliding support blocks symmetrically arranged on both sides of the guide support block 24.

[0046] Weld the sealing groove 12 to the steam inlet end of the mixing main pipe 11, with the opening of the sealing groove 12 facing the inlet end. Weld the guide bracket sliding groove to the bottom of the end (right end) of the mixing main pipe 11; at the same time, reserve the first mounting hole of the atomizing nozzle 31 at the upper part of the steam inlet section of the mixing main pipe 11.

[0047] Insert the slotted inner sleeve assembly into the right side of the mixing main pipe 11, and complete the assembly of the guide support block 24 and the sliding guide bracket slot 14 in one go. The cross-sections of the sliding guide bracket slot 14 and the guide support block 24 are both "T" shaped, so that the sliding guide bracket slot 14 restricts the guide support block 24, allowing them to move only axially, ensuring that the inner sleeve cannot rotate axially, and improving the operational stability of the inner sleeve. The right end of the inner sleeve is a free end that can expand freely. Furthermore, the left side of the inner sleeve assembly extends out of the sealing groove 12, and the end sealing ring 221 is welded to the left end of the slotted inner sleeve assembly. The inner sleeve body 21 is pulled to the left, and the skirt 222 connected to the outer end of the end sealing ring 221 is inserted into the opening of the sealing groove 12, completing the secondary assembly. The sealing groove 12 forms a stop against the end sealing ring 221. Further, a fixing ring is welded to the steam inlet end of the mixing main pipe 11, forming a stop against the end sealing ring 221, completing the assembly of the slotted inner sleeve and the mixing main pipe 11, forming a flexible connection. Furthermore, the fixed flow guide ring 13 has an inclined surface facing the inlet end of the mixing main pipe 11, extending from the inlet end to the outlet end of the mixing main pipe 11. This inclined surface towards the outlet end serves to guide flow and reduce resistance.

[0048] The atomizing nozzle extends from the reserved first mounting hole on the outer wall of the mixing main pipe 11, through the reserved U-shaped second mounting hole on the slotted inner sleeve, and into the inner sleeve body 21; the external cooling water is sprayed and atomized through the regulating system connecting flange 33, the water spray pipe 32 and the atomizing nozzle 31 and then enters the slotted inner sleeve, thereby reducing the temperature of the high-temperature steam flowing through.

[0049] With this structure, when high-temperature steam is depressurized by the pressure reducing valve and enters the desuperheater, the steam flows into the slotted stress-absorbing inner sleeve. Based on its flexible installation, the slotted stress-absorbing inner sleeve absorbs the thermal displacement caused by the difference in thermal expansion between the inner and outer pipes through its sliding end on the right, reducing axial stress. Simultaneously, the flexible connection on the left end and the unique slotted stress-absorbing sealing strip absorb circumferential stress caused by uneven water atomization. Furthermore, when the main steam flows through the slotted stress-absorbing inner sleeve, a small pressure difference is formed in the annular cavity between the inner sleeve and the mixing main pipe 11, ensuring the flow of low-temperature steam within the annular cavity and preventing water accumulation and impact at the bottom of the annular cavity. Ultimately, this prevents cracks or even breakage of the mixing main pipe 11 and the inner sleeve due to secondary stress, improving the reliability and service life of the desuperheater. By adopting a slotted stress-absorbing inner sleeve device, its front end is flexibly connected to the inner wall of the mixing main pipe 11, and its rear end is slidably connected to the mixing main pipe 11; this meets the axial / circumferential thermal stress compensation requirements caused by drastic temperature changes during desuperheater spraying water desuperheating, especially during variable operating conditions, and ensures the long-term, safe and effective operation of the mixing inner sleeve.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An attemperator characterized by, include: Mixing main pipe (11), inner sleeve and atomizing nozzle; The inner sleeve is connected inside the mixing main tube (11), and the two are spaced apart radially. The inner sleeve includes an inner sleeve body (21) and a slit sealing strip (25). A slit extending from its inlet end to its outlet end is provided on the side wall of the inner sleeve body (21). The cross-section of the gap sealing strip (25) is groove-shaped; one side forming the gap is connected to the back side of the opening of the gap sealing strip (25), and the other side forming the gap extends into the inside of the opening of the gap sealing strip (25) to form a sealed connection. The mixing main pipe (11) is provided with a first mounting hole, and the gap sealing strip (25) is provided with a second mounting hole. The atomizing nozzle passes through the first mounting hole and the second mounting hole and extends into the inner side of the inner sleeve.

2. The attemperator of claim 1, wherein, The inlet end of the inner sleeve is flexibly connected to the mixing main pipe (11); the outlet end of the inner sleeve is slidably connected to the mixing main pipe (11) along the axial direction of the inner sleeve.

3. An attemperator according to claim 2, characterised in that Along the direction from the inlet end to the outlet end of the mixing pipe (11), the inner wall of the mixing pipe (11) is provided with a fixed flow guide ring (13) and a sealing groove (12) spaced apart along the axial direction, and the opening of the sealing groove (12) faces the fixed flow guide ring (13). The inlet end of the inner sleeve (21) is connected to an end sealing ring (221) that protrudes outward in the circumferential direction. The outer circumferential end of the end sealing ring (221) is provided with a skirt (222) extending toward the outlet end of the inner sleeve (21). The skirt (222) and the outer wall of the inner sleeve (21) are arranged radially at intervals. The end sealing ring (221) is located between the fixed flow guide ring (13) and the sealing groove (12), the skirt (222) extends into the inside of the opening of the sealing groove (12), and the fixed flow guide ring (13) prevents the skirt (222) from coming out of the opening of the sealing groove (12).

4. The attemperator of claim 3, wherein, The fixed flow guide ring (13) has an inclined surface facing the inlet end of the mixing pipe (11), and the inclined surface is inclined towards the outlet end from the inlet end of the mixing pipe (11).

5. The attemperator of claim 2, wherein, A guide support block (24) is provided on the side wall of the outlet end of the inner sleeve. The inner wall of the mixing pipe (11) is provided with a sliding guide bracket slot (14) that is slidably connected to the guide support block (24) to restrict the guide support block (24) to slide only along the axial direction.

6. The attemperator of claim 5, wherein, The cross-sections of the sliding guide bracket slot (14) and the guide support block (24) are both "T" shaped.

7. The attemperator of claim 5, wherein, A sliding support block (23) is also provided on the side wall of the outlet end of the inner sleeve, and the sliding support block (23) is in contact with the inner wall of the mixing main pipe (11).

8. The attemperator of claim 7, wherein, The number of sliding support blocks (23) is multiple, and at least two sliding support blocks (23) are symmetrically arranged relative to the inner sleeve body (21).

9. The attemperator of claim 1, wherein, The atomizing nozzle includes an atomizing nozzle (31), a water spray pipe (32), and an adjustment system connecting flange (33) connected in sequence. The regulating system connecting flange (33) is used to connect to an external water source; The water spray guide pipe (32) passes through the first mounting hole and the second mounting hole; The outlet of the atomizing nozzle (31) faces the outlet end of the inner sleeve (21).

10. The attemperator of claim 3, wherein, The mixing pipe (11) is welded to the fixed flow guide ring (13) and the sealing groove (12) respectively.

Images