Ultrahigh-temperature and high-pressure drain valve for coal-fired unit with grade of 650 DEG C and above

Abstract

The invention discloses an ultrahigh-temperature and high-pressure drain valve for a coal-fired unit with the grade of 650 DEG C or above, belongs to the technical field of valves, and aims to solve the problem that an existing drain valve cannot be used in a steam environment of the coal-fired unit with the grade of 650 DEG C or above. Comprising a pressure reduction sleeve set, the upper portion of the periphery of the pressure reduction sleeve set is matched with a cut-off control port of a valve body, the lower portion of the pressure reduction sleeve set is matched with a valve seat spigot arranged on a medium outlet path of the valve body, a plurality of stacked labyrinth rings are arranged at the bottom of the pressure reduction sleeve set, and a valve clack is in sliding fit with the inner periphery of the pressure reduction sleeve set. The throttling hole sets arranged on the pressure reduction sleeve set are blocked or opened, pressure reduction can be conducted on media through the pressure reduction sleeve set, and the valve body, the valve seat, the pressure reduction sleeve set, the valve clack and the valve deck are all ferronickel-based precipitation strengthening type high-temperature alloy components subjected to strengthening heat treatment so as to adapt to the high-temperature environment.

Description

Technical Field

[0001] The present invention belongs to the field of valve technology, and in particular relates to an ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above. Background Art

[0002] The steam trap is installed at the terminal of the steam-heated pipeline to continuously discharge the condensed water in the steam-heated pipeline to the outside of the pipeline. It is divided into steam traps for steam systems and gas systems.

[0003] The design temperature of the high-temperature and high-pressure steam traps of existing ultra-supercritical coal-fired units is less than 630°C, the design pressure is less than 36MPa, and the material of the pressure-bearing components is F92. The design temperature of the steam traps of coal-fired units with a temperature of 650°C and above can reach 660°C, and the design pressure is 45MPa, which has exceeded the use range of F92 materials, and conventional materials can no longer be used. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above, so as to solve the problem that the existing ultra-supercritical coal-fired unit high temperature and high pressure steam trap cannot meet the high temperature and high pressure steam environment of coal-fired units with a temperature of 650°C or above. The technical solution adopted by the present invention is as follows:

[0005] An ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above, comprising a valve body, a valve seat, a pressure reducing sleeve assembly, a valve disc, a valve stem, a valve cover and an actuator;

[0006] The valve body is provided with a valve cavity, and the medium inlet, medium outlet and cut-off control port of the valve body are connected through the valve cavity, a valve seat is provided on the path of the medium outlet, an inner cone sealing surface is provided at the upper end of the inner hole of the valve seat, the pressure reducing sleeve group is composed of a small hole sleeve and a labyrinth assembly tube coaxially connected up and down, the labyrinth assembly tube is composed of a plurality of labyrinth rings stacked up and down, a plurality of labyrinth grooves connecting the inner periphery and the outer periphery are processed on the upper end surface of the labyrinth ring, the inner diameter of the small hole sleeve and the labyrinth ring are consistent with each other and the outer diameter is consistent, the upper part of the outer periphery of the small hole sleeve cooperates with the cut-off control port, a gap is provided between the middle part of the outer periphery of the small hole sleeve and the cut-off control port, the lower part of the small hole sleeve and the labyrinth assembly tube extend into the valve cavity, and the lower end of the labyrinth assembly tube is close to the valve seat stop The valve body is matched with the valve mouth, a plurality of balancing holes are arranged in the middle of the small-hole sleeve, the interior of the small-hole sleeve is connected with the valve cavity through the plurality of balancing holes and the gap, a working space is arranged between the lower part of the small-hole sleeve and the side wall of the labyrinth assembly tube and the valve cavity, a plurality of throttling hole groups are opened in the axial direction of the lower part of the small-hole sleeve, the valve flap is a stepped shaft structure, the valve flap comprises a first shaft section, a second shaft section and a third shaft section whose diameters decrease from top to bottom, the second shaft section and the third shaft section are connected through an outer cone sealing surface, the outer periphery of the first shaft section is slidably matched with the inner periphery of the pressure reducing sleeve group, the first shaft section blocks or opens a plurality of throttling hole groups, an annular cavity is formed between the second shaft section and the pressure reducing sleeve group, the inner cone sealing surface and the outer cone sealing surface are pressed against each other for sealing or separation;

[0007] The valve cover is connected to the valve body, and the valve cover presses the sealing ring onto the upper end face of the pressure reducing sleeve group. The valve cover is sealed with the cut-off control port through the sealing ring. The lower end of the valve stem passes through the valve cover and is connected to the valve disc. The nut seat is supported on the top of the valve body by two columns. A nut recessed groove is provided on the upper end face of the nut seat. The actuator nut is rotatably arranged in the nut recessed groove. The actuator nut cooperates with the upper thread of the valve stem. The actuator is connected to the nut seat. The output end of the actuator is connected to the actuator nut. A guide beam is sleeved on the valve stem. The two ends of the guide beam are respectively slidably matched with the two columns. The valve body, valve seat, pressure reducing sleeve group, valve disc and valve cover are all nickel-iron based precipitation strengthened high temperature alloy components that have undergone enhanced heat treatment.

[0008] Furthermore, a T-shaped slot is provided on one side of the valve disc, and a flange is provided on the lower end of the valve stem, and the flange is adaptively connected to the T-shaped slot.

[0009] Furthermore, a heating tape is wound around the outer surface of the valve body.

[0010] Furthermore, a throttling groove is provided on the lower end surface of the valve disc, and a plurality of throttling oblong holes connected to the throttling groove are processed on the side wall of the third shaft segment. The outer periphery of the third shaft segment is slidably matched or separated with the inner hole of the valve seat, and the inner hole of the valve seat closes or opens a plurality of throttling oblong holes.

[0011] Furthermore, the valve seat and the valve body are of a split structure, and the valve seat and the valve body are sealed by a compression sealing gasket.

[0012] Furthermore, a shoulder structure is provided on the outer periphery of the execution nut, a thrust bearing is provided between the lower end surface of the shoulder structure and the bottom of the nut groove, a retaining ring is provided at the upper opening of the nut groove, a thrust bearing is provided between the lower end surface of the retaining ring and the upper end surface of the shoulder structure, and the execution nut is rotatably arranged in the nut groove through two thrust bearings.

[0013] Furthermore, a heat insulation plate is provided on the outer periphery of the valve body, and the heat insulation plate is located in the radial direction of the sealing ring.

[0014] Furthermore, a stuffing box is provided on the upper end surface of the valve cover, a stuffing plate is connected to the valve cover, the stuffing plate and the stuffing cover are abutted against each other, the stuffing plate presses the graphite stuffing on the bottom surface of the stuffing box through the stuffing cover, and the valve stem and the valve cover are slidably sealed through the graphite stuffing.

[0015] Furthermore, the upper end surface of the packing gland is a convex spherical surface, and the lower end surface of the packing pressure plate is provided with a spherical groove, and the convex spherical surface and the spherical groove are universally tangentially matched.

[0016] Furthermore, a spiral groove is processed on the outer periphery of the valve cover, the cooling hood is a cylindrical component, the inner periphery of the cooling hood is sealed and connected to the outer periphery of the valve cover, and a water cooling inlet and a water cooling outlet are processed on the cooling hood. The water cooling inlet is connected to the lower end of the spiral groove, and the water cooling outlet is connected to the upper end of the spiral groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The pressure reducing sleeve group is composed of a layer of labyrinth rings and a small hole sleeve welded together. The labyrinth ring can reduce the medium flow rate at the valve seat when the steam trap is at a small opening, thereby reducing the scouring of the valve seat by the medium. When the steam trap is at a large opening, the medium converges from the outside of the pressure reducing sleeve group to the inside through a number of throttling hole groups, and the medium collides with each other to eliminate its energy, thereby reducing the medium pressure. By performing enhanced heat treatment on the precipitation-strengthened nickel-iron-based high-temperature alloy, adjusting its structure and enhancing material properties, it can be applied to coal-fired units of 650°C and above. The present invention solves the problem that the existing high-temperature and high-pressure steam traps of ultra-supercritical coal-fired units cannot meet the high-temperature and high-pressure steam environment of coal-fired units of 650°C and above.

[0019] 2. The heating temperature of the heating belt is set at 400℃-450℃. The steam trap is heated before the unit is operated to reduce the sudden thermal shock to the steam trap. At the same time, when the unit is running, the temperature difference between the medium inlet and the medium outlet is reduced to make the thermal expansion of the valve body uniform, thereby ensuring the performance of the steam trap.

[0020] 3. A throttling groove is provided on the lower end surface of the valve disc, and a number of throttling oblong holes connected to the throttling groove are processed on the side wall of the third shaft section. The outer periphery of the third shaft section slides with or separates from the inner hole of the valve seat, and the inner hole of the valve seat closes or opens a number of throttling oblong holes, so that the medium undergoes secondary throttling and decompression between the valve disc and the valve seat, further reducing the pressure of the medium.

[0021] 4. The valve seat and valve body are split structures, and the valve seat and valve body are sealed by a compressed sealing gasket. When the valve seat is damaged, it is easy to replace

[0022] 5. The cooling hood is welded to the valve cover, and a water cooling channel is formed on the outer surface of the valve cover. The cooling water supply pipe is connected to the water cooling inlet, and the cooling water return pipe is connected to the water cooling outlet. The valve cover is cooled by the flow of water, which reduces the temperature of the medium at the graphite packing, effectively solves the problem of high-temperature loss of graphite packing, and increases the valve sealing life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Figure 2 is a cross-sectional view of a pressure relief sleeve assembly;

[0025] Figure 3 is a cross-sectional view of the nut seat;

[0026] Figure 4 It is a top view of the maze ring;

[0027] Figure 5 is a cross-sectional view of the valve disc;

[0028] Figure 6 It is a schematic diagram of the connection between the cooling hood and the valve cover;

[0029] Figure 7 is a cross-sectional view of the valve cover;

[0030] Figure 8 It is a cross-sectional view of the valve body.

[0031] In the figure, 1. valve body, 2. sealing gasket, 3. valve seat, 4. pressure reducing sleeve group, 5. valve disc, 6. valve stem, 7. sealing ring, 8. valve cover, 9. heat insulation board, 10. column, 11. cooling cover, 12. graphite packing, 13. packing gland, 14. packing pressure plate, 15. retaining ring, 16. small hole sleeve, 17. throttle hole group, 18. guide beam, 19. nut seat, 20. executive nut, 21. thrust bearing, 22. .Actuator, 23. Labyrinth ring, 24. Nut groove, 25. First shaft section, 26. Second shaft section, 27. External cone sealing surface, 28. Third shaft section, 29. Throttling groove, 30. Throttling oblong hole, 31. T-slot, 32. Spiral groove, 33. Water cooling outlet, 34. Water cooling inlet, 35. Stuffing box, 36. Valve cavity, 37. Medium inlet, 38. Medium outlet, 39. Cut-off control port, 40. Balance hole. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0033] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0035] Example: Figures 1 to 8 As shown, an ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above comprises a valve body 1, a valve seat 3, a pressure reducing sleeve assembly 4, a valve disc 5, a valve stem 6, a valve cover 8 and an actuator 22;

[0036] The valve body 1 is provided with a valve cavity 36, and the medium inlet 37, the medium outlet 38 and the cut-off control port 39 of the valve body 1 are connected through the valve cavity 36. A valve seat 3 is provided on the path of the medium outlet 38, and an inner cone sealing surface is provided at the upper end of the inner hole of the valve seat 3. The pressure reducing sleeve group 4 is composed of a small hole sleeve 16 and a labyrinth component tube coaxially connected up and down. The labyrinth component tube is composed of a plurality of labyrinth rings 23 stacked up and down. A plurality of labyrinth grooves connecting the inner periphery and the outer periphery are processed on the upper end surface of the labyrinth ring 23. The small hole sleeve 16 and the labyrinth ring 23 have the same inner diameter and outer diameter. The upper part of the outer periphery of the small hole sleeve 16 cooperates with the cut-off control port 39, and a gap is provided between the middle part of the outer periphery of the small hole sleeve 16 and the cut-off control port 39. The lower part of the small hole sleeve 16 and the labyrinth component tube extend into the valve cavity 36, and the lower end of the labyrinth component tube cooperates with the stop port of the valve seat 3. The small hole sleeve 16 is combined, a plurality of balancing holes 40 are provided in the middle part, the interior of the small hole sleeve 16 is communicated with the valve cavity 36 through the plurality of balancing holes 40 and the gap, a working space is provided between the lower part of the small hole sleeve 16 and the side wall of the labyrinth assembly tube and the valve cavity 36, a plurality of throttling hole groups 17 are opened axially in the lower part of the small hole sleeve 16, the valve flap 5 is a stepped shaft structure, the valve flap 5 includes a first shaft section 25, a second shaft section 26 and a third shaft section 28, the diameters of which decrease from top to bottom, the second shaft section 26 and the third shaft section 28 are connected through an outer cone sealing surface 27, the outer periphery of the first shaft section 25 is slidably matched with the inner periphery of the pressure reducing sleeve group 4, the first shaft section 25 blocks or opens a plurality of throttling hole groups 17, an annular cavity is formed between the second shaft section 26 and the pressure reducing sleeve group 4, the inner cone sealing surface and the outer cone sealing surface 27 are abutted for sealing or separation;

[0037] The valve cover 8 is connected to the valve body 1 by bolts. The valve cover 8 presses the sealing ring 7 onto the upper end surface of the pressure reducing sleeve group 4. The valve cover 8 is sealed with the cut-off control port 39 through the sealing ring 7. The lower end of the valve stem 6 passes through the valve cover 8 and is connected to the valve disc 5. The nut seat 19 is supported on the top of the valve body 1 by two columns 10. A nut sink groove 24 is provided on the upper end surface of the nut seat 19. The actuator nut 20 is rotatably set in the nut sink groove 24. The actuator nut 20 is matched with the upper thread of the valve stem 6. The actuator 22 is connected to the nut seat 19. The output end of the actuator 22 is connected to the actuator nut 20. A guide beam 18 is sleeved on the valve stem 6. The two ends of the guide beam 18 are respectively slidably matched with the two columns 10. The valve body 1, the valve seat 3, the pressure reducing sleeve group 4, the valve disc 5 and the valve cover 8 are all nickel-iron based precipitation strengthened high temperature alloy components that have undergone enhanced heat treatment.

[0038] The pressure reducing sleeve group 4 is welded by 8 layers of labyrinth rings 23 and a small hole sleeve 16. The labyrinth ring 23 can reduce the medium flow rate at the valve seat 3 when the steam trap is at a small opening, thereby reducing the scouring of the valve seat 3 by the medium. When the steam trap is at a large opening, the medium converges from the outside of the pressure reducing sleeve group 4 to the inside through a plurality of throttling hole groups 17, and the medium collides with each other to eliminate its energy, thereby reducing the medium pressure.

[0039] The balancing hole 40 is used to keep the upper and lower pressures of the valve disc 5 consistent. When the valve is closed, the medium enters the pressure reducing sleeve group 4 through the balancing hole 40 to avoid the pressure in the space above the valve disc 5 from decreasing. When the valve is opened, the medium in the pressure reducing sleeve group 4 can escape from the balancing hole 40 to avoid the pressure in the space above the valve disc 5 from increasing.

[0040] By performing heat treatment on the precipitation-strengthened nickel-iron-based high-temperature alloy, adjusting its structure and enhancing material properties, it can be applied to coal-fired units at 650°C and above. The present invention solves the problem that the existing high-temperature and high-pressure steam traps of ultra-supercritical coal-fired units cannot meet the high-temperature and high-pressure steam environment of coal-fired units at 650°C and above.

[0041] A T-shaped slot 31 is formed on one side of the valve flap 5 , and a flange is formed on the lower end of the valve stem 6 , and the flange is adapted to be connected with the T-shaped slot 31 .

[0042] The outer surface of the valve body 1 is wrapped with a heating belt, and the heating temperature of the heating belt is set at 400-450°C. The steam trap is heated before the unit is operated to reduce the sudden thermal shock to the steam trap. At the same time, when the unit is running, the temperature difference between the medium inlet 37 and the medium outlet 38 is reduced to make the valve body 1 thermally expand evenly, thereby ensuring the performance of the steam trap.

[0043] A throttling groove 29 is provided on the lower end surface of the valve disc 5, and a plurality of throttling oblong holes 30 connected to the throttling groove 29 are processed on the side wall of the third shaft segment 28. The outer periphery of the third shaft segment 28 is slidably matched or separated with the inner hole of the valve seat 3, and the inner hole of the valve seat 3 closes or opens a plurality of throttling oblong holes 30, so that the medium undergoes secondary throttling and decompression between the valve disc 5 and the valve seat 3, thereby further reducing the pressure of the medium.

[0044] The valve seat 3 and the valve body 1 are of a split structure, and the valve seat 3 and the valve body 1 are sealed by compressing the sealing gasket 2, so that the valve seat 3 is easy to replace when it is damaged.

[0045] A shoulder structure is provided on the outer periphery of the actuator nut 20, a thrust bearing 21 is provided between the lower end surface of the shoulder structure and the bottom of the nut recessed groove 24, a retaining ring 15 is provided at the upper opening of the nut recessed groove 24, a thrust bearing 21 is provided between the lower end surface of the retaining ring 15 and the upper end surface of the shoulder structure, and the actuator nut 20 is rotatably arranged in the nut recessed groove 24 via two thrust bearings 21.

[0046] A heat insulation plate 9 is provided on the outer periphery of the valve body 1 , and the heat insulation plate 9 is located in the radial direction of the sealing ring 7 .

[0047] A stuffing box 35 is provided on the upper end surface of the valve cover 8, and a stuffing pressure plate 14 is connected to the valve cover 8. The stuffing pressure plate 14 and the stuffing gland 13 are abutted against each other up and down. The stuffing pressure plate 14 presses the graphite stuffing 12 onto the bottom surface of the stuffing box 35 through the stuffing gland 13, and the valve stem 6 and the valve cover 8 are slidably sealed through the graphite stuffing 12.

[0048] The upper end surface of the packing gland 13 is a convex spherical surface, and the lower end surface of the packing pressure plate 14 is provided with a spherical groove, and the convex spherical surface and the spherical groove are universally tangentially matched.

[0049] The outer periphery of the valve cover 8 is processed with a spiral groove 32. The cooling cover 11 is a cylindrical component. The inner periphery of the cooling cover 11 is sealed and connected to the outer periphery of the valve cover 8. The cooling cover 11 is processed with a water cooling inlet 34 and a water cooling outlet 33. The water cooling inlet 34 is connected to the lower end of the spiral groove 32, and the water cooling outlet 33 is connected to the upper end of the spiral groove 32. The cooling cover 11 is welded to the valve cover 8, and a water cooling channel is formed on the outer surface of the valve cover 8. The cooling water supply pipe is connected to the water cooling inlet 34, and the cooling water return pipe is connected to the water cooling outlet 33. The valve cover 8 is cooled by the flow of water, and the temperature of the medium at the graphite filler 12 is reduced, which can effectively solve the problem of high-temperature loss of the graphite filler 12 and increase the valve sealing life.

[0050] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. An ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above, characterized in that: It comprises a valve body (1), a valve seat (3), a pressure reducing sleeve assembly (4), a valve disc (5), a valve stem (6), a valve cover (8) and an actuator (22); The valve body (1) is provided with a valve cavity (36), and the medium inlet (37), the medium outlet (38) and the cut-off control port (39) of the valve body (1) are connected through the valve cavity (36). A valve seat (3) is provided on the path of the medium outlet (38), and an inner cone sealing surface is provided at the upper end of the inner hole of the valve seat (3). The pressure reducing sleeve group (4) is composed of a small hole sleeve (16) and a labyrinth assembly cylinder connected coaxially up and down, and the labyrinth assembly cylinder is composed of a plurality of labyrinth rings (23) stacked up and down, and the labyrinth rings are A plurality of labyrinth grooves connecting the inner and outer circumferences are processed on the upper end surface of the small hole sleeve (16) and the labyrinth ring (23). The inner diameters and outer diameters of the small hole sleeve (16) and the labyrinth ring (23) are consistent. The upper part of the outer circumference of the small hole sleeve (16) is matched with the cut-off control port (39). A gap is provided between the middle part of the outer circumference of the small hole sleeve (16) and the cut-off control port (39). The lower part of the small hole sleeve (16) and the labyrinth assembly tube extend into the valve cavity (36). The lower end of the labyrinth assembly tube is matched with the stopper of the valve seat (3). A plurality of balancing holes (40) are provided in the middle of the small hole sleeve (16); the interior of the small hole sleeve (16) is communicated with the valve cavity (36) through the plurality of balancing holes (40) and the gap; a working space is provided between the lower part of the small hole sleeve (16) and the side wall of the labyrinth assembly tube and the valve cavity (36); a plurality of throttling hole groups (17) are opened in the axial direction at the lower part of the small hole sleeve (16); the valve flap (5) is in a stepped shaft structure; the valve flap (5) includes a plurality of first and second valves (17) with diameters decreasing from top to bottom; A shaft section (25), a second shaft section (26) and a third shaft section (28), the second shaft section (26) and the third shaft section (28) are connected via an outer cone sealing surface (27), the outer periphery of the first shaft section (25) is slidably matched with the inner periphery of the pressure reducing sleeve group (4), the first shaft section (25) blocks or opens a plurality of throttle hole groups (17), an annular cavity is formed between the second shaft section (26) and the pressure reducing sleeve group (4), the inner cone sealing surface and the outer cone sealing surface (27) are abutted to seal or separate; The valve cover (8) is connected to the valve body (1). The valve cover (8) presses the sealing ring (7) against the upper end surface of the pressure reducing sleeve assembly (4). The valve cover (8) is sealed with the cut-off control port (39) through the sealing ring (7). The lower end of the valve stem (6) passes through the valve cover (8) and is connected to the valve disc (5). The nut seat (19) is supported on the upper side of the valve body (1) through two columns (10). A nut recess (24) is provided on the upper end surface of the nut seat (19). The actuator nut (20) is rotated and arranged in the nut recess (24). ), the actuator nut (20) is matched with the upper thread of the valve stem (6), the actuator (22) is connected to the nut seat (19), the output end of the actuator (22) is connected to the actuator nut (20), the valve stem (6) is sleeved with a guide beam (18), the two ends of the guide beam (18) are respectively slidably matched with the two columns (10), the valve body (1), the valve seat (3), the pressure reducing sleeve group (4), the valve disc (5) and the valve cover (8) are all nickel-iron based precipitation strengthening type high temperature alloy components that have undergone strengthening heat treatment.

2. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: A T-shaped groove (31) is provided on one side of the valve flap (5), and a flange is provided at the lower end of the valve stem (6), and the flange is adaptively connected to the T-shaped groove (31).

3. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: The outer surface of the valve body (1) is wrapped with a heating tape.

4. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: A throttling groove (29) is provided on the lower end surface of the valve disc (5), and a plurality of throttling oblong holes (30) connected to the throttling groove (29) are processed on the side wall of the third shaft section (28). The outer periphery of the third shaft section (28) is slidably matched with or separated from the inner hole of the valve seat (3), and the inner hole of the valve seat (3) closes or opens a plurality of throttling oblong holes (30).

5. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: The valve seat (3) and the valve body (1) are of a split structure, and the valve seat (3) and the valve body (1) are sealed by a compression sealing gasket (2).

6. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: A shoulder structure is provided on the outer periphery of the execution nut (20), a thrust bearing (21) is provided between the lower end surface of the shoulder structure and the bottom of the nut recessed groove (24), a retaining ring (15) is provided at the upper opening of the nut recessed groove (24), a thrust bearing (21) is provided between the lower end surface of the retaining ring (15) and the upper end surface of the shoulder structure, and the execution nut (20) is rotatably arranged in the nut recessed groove (24) via two thrust bearings (21).

7. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: A heat insulation plate (9) is provided on the outer periphery of the valve body (1), and the heat insulation plate (9) is located in the radial direction of the sealing ring (7).

8. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 1, characterized in that: A stuffing box (35) is provided on the upper end surface of the valve cover (8). A stuffing pressure plate (14) is connected to the valve cover (8). The stuffing pressure plate (14) and the stuffing pressure cover (13) are abutted against each other up and down. The stuffing pressure plate (14) presses the graphite stuffing (12) onto the bottom surface of the stuffing box (35) through the stuffing pressure cover (13). The valve stem (6) and the valve cover (8) are slidably sealed through the graphite stuffing (12).

9. The ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to claim 8, characterized in that: The upper end surface of the packing gland (13) is a convex spherical surface, and the lower end surface of the packing pressure plate (14) is provided with a spherical groove, and the convex spherical surface and the spherical groove are universally tangentially matched.

10. An ultra-high temperature and high pressure steam trap for coal-fired units with a temperature of 650°C or above according to any one of claims 1 to 9, characterized in that: The outer periphery of the valve cover (8) is processed with a spiral groove (32); the cooling cover (11) is a cylindrical component; the inner periphery of the cooling cover (11) is sealedly connected to the outer periphery of the valve cover (8); the cooling cover (11) is processed with a water cooling inlet (34) and a water cooling outlet (33); the water cooling inlet (34) is connected to the lower end of the spiral groove (32); and the water cooling outlet (33) is connected to the upper end of the spiral groove (32).

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