A high temperature liquid slag control valve system

Abstract

The present invention discloses a high-temperature liquid slag control valve system, including a valve body, a valve seat, a valve cover, a valve stem and an electric actuator. The valve seat is arranged in the valve body and a fluid inlet and a fluid outlet are arranged at both ends of the valve body. The inner end of the valve stem corresponds to the valve port of the valve seat, and the outer end of the valve stem extends to the outside of the valve cover and is connected to the electric actuator. The electric actuator drives the valve stem to rise and fall to open or close the valve port of the valve seat. A fixed bracket for installing the electric actuator is arranged on the valve cover, and a purge mechanism is also arranged which can purge the outer wall of the valve stem when the valve stem is in a closed state. The present invention adopts a high-temperature airflow to purge the lower end of the valve stem. The airflow blows open the crystals on the outer surface of the valve stem from top to bottom, and the purge is more sufficient, so that the valve stem can operate normally.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature liquid slag transmission, and in particular to a high-temperature liquid slag control valve system. Background Art

[0002] In the steelmaking furnace of the large metallurgical industry, the molten steel with a larger specific gravity is poured into the ladle or ingot film, and the floating slag on the top, mainly composed of CaO, MgO2, SiO2, etc., was poured into the pool in the past. In order to save energy and improve economic benefits, a large rotary granulator is now designed to send the high-temperature slag into the granulator. By taking advantage of the difference in specific gravity, the light slag is thrown out a long distance and recycled as a building material, while the heavy slag is located in the center, generally a metal material, which is recycled and re-smelted. The high-temperature slag poured out from the steelmaking furnace is stored in a large storage tank. From the storage tank to the granulator, an ultra-high temperature slag control valve is required to control the on and off of the solution. However, the high-temperature liquid slag will thicken and even solidify into crystals below 800°C, affecting the lifting and lowering movement of the valve stem. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide a high-temperature liquid slag control valve system.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-temperature liquid slag control valve system, comprising a valve body, a valve seat, a valve cover, a valve stem and an electric actuator, the valve seat is arranged in the valve body and a fluid inlet and a fluid outlet are arranged at both ends of the valve body, the inner end of the valve stem corresponds to the valve port of the valve seat, the outer end of the valve stem extends to the outside of the valve cover and is connected to the electric actuator, the electric actuator drives the valve stem to rise and fall to open or close the valve port of the valve seat, the valve cover is provided with a fixing bracket for installing the electric actuator, and is also provided with a purge mechanism that can purge the outer wall of the valve stem when the valve stem is closed, the purge mechanism comprises an inflation pipeline and a return pipeline, a conduit is arranged in the valve body, a fluid channel and an installation channel that are interconnected are arranged in the conduit, the fluid channel is connected with the fluid inlet and the fluid outlet, a valve stem sleeve that rises and falls synchronously with the valve stem is fixed to the outside of the valve stem, and the upper end of the valve stem sleeve is a sealing The valve stem sleeve is sealed and arranged in the installation channel, a first annular air channel is formed between the inner wall of the valve stem sleeve and the outer wall of the valve stem, a second annular air channel is formed between the inner wall of the part of the conduit corresponding to the valve stem and the outer wall of the valve stem sleeve, the bottom of the first annular air channel is connected to the bottom of the second annular air channel, the inflation pipeline comprises a high-temperature air inlet pipe and an inert gas supply mechanism, one end of the high-temperature air inlet pipe is connected to the inert gas supply mechanism, and the other end is connected to the first annular air channel, the high-temperature air inlet pipe is connected with a pneumatic high-temperature cut-off valve 1, a heater and a pneumatic high-temperature cut-off valve 3 in sequence, the heater is provided with a pressure sensor and a temperature sensor for detecting the internal pressure and temperature of the high-temperature air inlet pipe, the return air pipeline comprises a high-temperature exhaust pipe and a gas storage tank, one end of the high-temperature exhaust pipe is connected to the second annular air channel, and the high-temperature exhaust pipe is connected with a pneumatic high-temperature cut-off valve 2 located between the gas storage tank and the second annular air channel.

[0005] As a preferred technical solution of the present invention, a Haver sleeve for connecting the valve stem sleeve and the high-temperature air inlet pipe is provided on the fixed bracket, the Haver sleeve includes two sleeve shells which are covered on the outer wall of the valve stem sleeve and assembled with each other, the two sleeve shells are fastened by bolts, a sealing ring gasket is fixed in the Haver sleeve, the valve stem sleeve is penetrated by the sealing ring gasket and the valve stem sleeve slides axially on the Haver sleeve, a first air inlet hole connected with the first annular air channel is provided on the outer wall of the valve stem sleeve, a second air inlet hole corresponding to the first air inlet hole is opened on one of the sleeve shells, one end of the high-temperature air inlet pipe is welded to the sleeve shell and is connected with the second air inlet hole, the first air inlet hole corresponds to the second air inlet hole when the valve stem is closed, and the first air inlet hole and the second air inlet hole are staggered in the axial direction when the valve stem is open.

[0006] As a preferred technical solution of the present invention, an exhaust hole corresponding to the second annular air channel is opened on the valve cover, and one end of the high-temperature exhaust pipe is welded to the side wall of the valve cover and communicated with the exhaust hole.

[0007] As a preferred technical solution of the present invention, a cooling cavity and a cooling water pipe fixed in the cooling cavity are provided in the valve stem, the lower end of the cooling water pipe is slightly higher than the bottom wall of the cooling cavity, a cooling water reflux channel is formed between the outer wall of the cooling water pipe and the inner wall and bottom wall of the cooling cavity, a cooling water inlet channel is provided in the cooling water pipe, and a cooling water inlet and a cooling water outlet are staggeredly arranged along the axial direction on the outer wall of the valve stem, and the cooling water inlet and the cooling water outlet are respectively connected to the cooling water inlet channel and the cooling water reflux channel.

[0008] As a preferred technical solution of the present invention, a jacket is arranged outside the valve body and a sandwich is formed between the jacket and the valve body, and the sandwich is connected to a water circulation cooling mechanism.

[0009] As a preferred technical solution of the present invention, the valve body includes an upper valve and a lower valve, the fluid channels of the upper valve and the lower valve are located on the same oblique line, the valve stem coincides with the central axis of the installation channel and the angle formed between the central axis of the valve stem and the central axis of the fluid channel is 30°-45°, the valve seat is fixed between the upper valve and the lower valve, the lower end of the valve stem is perpendicular to the valve port of the valve seat and the lower end of the valve stem is sealed with the valve port.

[0010] As a preferred technical solution of the present invention, an insulation tube assembly is arranged outside the catheter, and the insulation tube assembly includes an inner sleeve and an outer sleeve arranged in sequence from the inside to the outside, and the outer walls of the catheter, the inner sleeve and the outer sleeve are all provided with a liquid insulation coating.

[0011] As a preferred technical solution of the present invention, the heater includes a heating box, a ceramic electric furnace core, a positioning ceramic base, a high-temperature resistance wire and a box cover. The box cover and the heating box are sealed to form a heating chamber. The positioning ceramic base is fixed in the heating box and the outer wall of the positioning ceramic base is in contact with the inner wall of the heating box. The ceramic electric furnace core is inserted and limited in the positioning ceramic base. A ceramic insulating sleeve is installed on the box cover. The high-temperature resistance wire is built into the ceramic insulating sleeve and the inner end of the high-temperature resistance wire is connected to the ceramic electric furnace core.

[0012] As a preferred technical solution of the present invention, the high-temperature air intake pipe includes a high-temperature resistant pipe, a liquid thermal insulation coating and an external sleeve.

[0013] As a preferred technical solution of the present invention, the inert gas supply mechanism is a high-pressure nitrogen cylinder or a high-pressure argon cylinder.

[0014] In summary, the beneficial effects of the present invention are:

[0015] In order to prevent the medium (high-temperature slag) from becoming viscous or even crystallizing after cooling, and adhering to the outer surface of the valve stem and affecting the movement of the valve stem, the outer surface of the valve stem should be purged with high-temperature inert gas. When the valve is closed, the conical surface at the lower end of the valve stem and the sealing surface at the valve seat orifice are sealed, and a signal is sent to the pneumatic high-temperature cut-off valve 1 and the pneumatic high-temperature cut-off valve 2 to open at the same time. At this time, the cylinders of the two cut-off valves are controlled by the solenoid valve to inflate the cylinders. When the pressure in the heater is lower than 0.6Mpa, the pneumatic high-temperature cut-off valve 3 is automatically opened to fill the heater with high-pressure nitrogen or high-pressure argon; when the gas temperature of the heater is lower than 800℃, the high-temperature resistance wire is connected and heating begins. At this time, the high-temperature airflow flows from the first annular airway between the outer circle of the valve stem and the inner wall of the valve stem sleeve from top to bottom. The fluid channel of the conduit is full of high-temperature slag liquid. At this time, the high-temperature gas will blow away part of the slag, and the airflow forms a second annular airway between the outer circle of the valve stem sleeve and the inner circle of the conduit, flowing from bottom to top to the lower end of the stuffing box, and finally discharged into the gas storage tank, completing the entire purging action. (See the instructions for additional content) BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a structural view of the control valve in the present invention;

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure of the upper part of the control valve;

[0019] Figure 4 yes Figure 2 Schematic diagram of the structure of the lower part of the control valve;

[0020] Figure 5 It is a schematic diagram of the purge mechanism of the present invention;

[0021] Figure 6 yes Figure 1 Enlarged view of local C;

[0022] Figure 7 yes Figure 1 Enlarged view of local D;

[0023] Figure 8 yes Figure 1 Enlarged view of part I;

[0024] Fig. 9 is a cross-sectional view of AA of the present invention;

[0025] Fig.10 It is a cross-sectional view of BB of the present invention.

[0026] Figure numerals: 1, valve body; 2, valve seat; 3, valve cover; 4, valve stem; 5, electric actuator; 6, fluid inlet; 7, fluid outlet; 8, fixed bracket; 9, purge mechanism; 10, charging pipeline; 11, return air pipeline; 12, catheter; 13, fluid channel; 14, installation channel; 15, valve stem sleeve; 16, first annular air channel; 17, second annular air channel; 18, high-temperature air inlet pipe; 19, inert gas supply mechanism; 20, pneumatic high-temperature cut-off valve one; 21, heater; 22, pneumatic high-temperature cut-off valve three; 23, pressure sensor; 24, temperature sensor; 25, high-temperature exhaust pipe; 26, gas storage tank; 27, pneumatic high-temperature cut-off valve two; 28, Haver sleeve; 29. ​​Sleeve shell; 30. Sealing ring gasket; 31. First air inlet; 32. Second air inlet; 33. Exhaust hole; 34. Cooling chamber; 35. Cooling water pipe; 36. Cooling water reflux channel; 37. Cooling water inlet channel; 38. Cooling water inlet; 39. Cooling water outlet; 40. Interlayer; 41. Upper valve; 42. Lower valve; 43. Insulation pipe assembly; 44. Inner sleeve; 45. Outer sleeve; 46. Liquid insulation coating; 47. Heating box; 48. Ceramic electric furnace core; 49. Positioning ceramic base; 50. High-temperature resistance wire; 51. Box cover; 52. Heating chamber; 53. Ceramic insulation sleeve; 54. High-temperature resistant pipe; 55. External sleeve; 56. Filler. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects of the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments and drawings, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] The specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0029] like Figure 1-10A high-temperature liquid slag control valve system shown in the figure comprises a valve body 1, a valve seat 2, a valve cover 3, a valve stem 4 and an electric actuator 5, wherein the valve seat 2 is arranged in the valve body 1 and a fluid inlet 6 and a fluid outlet 7 are arranged at both ends of the valve body 1, the inner end of the valve stem 4 corresponds to the valve port of the valve seat 2, and the outer end of the valve stem 4 extends to the outside of the valve cover 3 and is connected to the electric actuator 5, the electric actuator 5 drives the valve stem 4 to rise and fall so as to open or close the valve port of the valve seat 2, the valve cover 3 is provided with a fixing bracket 8 for installing the electric actuator 5, and is also provided with a purge mechanism 9 for purging the outer wall of the valve stem 4 when the valve stem 4 is in a closed state, in this embodiment, the valve stem 4 can be a whole stem or can be welded in multiple sections, the valve stem 4 is divided into three sections, and three different materials are selected: ① the lower end is made of full tungsten W1, ② the middle section is made of high-temperature alloy steel GH3128, and the upper end is made of F304, and the segmented design is helpful to improve stress distribution, reduce concentrated stress, and thus increase the service life of the valve stem 4.

[0030] The purge mechanism 9 includes an air charging pipeline 10 and an air return pipeline 11. A conduit 12 is provided in the valve body 1. The wall thickness of the conduit 12 is determined according to the inner hole of the fluid channel 13, which is generally 1 / 2 to 1 / 4 of the inner diameter to ensure a certain strength and rigidity at high temperatures. The conduit 12 is provided with a fluid channel 13 and an installation channel 14 that are interconnected. The fluid channel 13 is connected to the fluid inlet 6 and the fluid outlet 7. A valve stem sleeve 15 that rises and falls synchronously with the valve stem 4 is fixed outside the valve stem 4. The valve The upper end of the stem sleeve 15 is a sealed end. The valve stem sleeve 15 is arranged in the installation channel 14. A first annular air channel 16 is formed between the inner wall of the valve stem sleeve 15 and the outer wall of the valve stem 4. A second annular air channel 17 is formed between the inner wall of the portion of the conduit 12 corresponding to the valve stem 4 and the outer wall of the valve stem sleeve 15. The bottom of the first annular air channel 16 is connected to the bottom of the second annular air channel 17. The charging pipeline 10 includes a high-temperature air inlet pipe 18 and an inert gas supply mechanism 19. The high-temperature air inlet pipe One end of 18 is connected to the inert gas supply mechanism 19, and the other end is connected to the first annular air channel 16. The high-temperature air intake pipe 18 is connected with a pneumatic high-temperature shut-off valve 1 20, a heater 21 and a pneumatic high-temperature shut-off valve 3 22 in sequence. The heater 21 is provided with a pressure sensor 23 and a temperature sensor 24 for detecting the internal pressure and temperature of the high-temperature air intake pipe 18. The return air pipeline 11 includes a high-temperature exhaust pipe 25 and a gas storage tank 26. One end of the high-temperature exhaust pipe 25 is connected to the second annular air channel 17. The high-temperature exhaust pipe 25 is connected with a pneumatic high-temperature shut-off valve 27 located between the gas storage tank 26 and the second annular air channel 17. How to realize automatic control of the purge mechanism 9 is not the focus of the present invention. This is a prior art and is not specifically described. The main purpose of the present invention is to provide a purge mechanism 9 to solve the problem that slag crystallization adheres to the valve stem 4 and affects its lifting and lowering. In this embodiment, the inert gas supply mechanism 19 is a high-pressure nitrogen cylinder or a high-pressure argon cylinder.

[0031] A Haver sleeve 28 for connecting the valve stem sleeve 15 and the high-temperature air inlet pipe 18 is provided on the fixed bracket 8, and the Haver sleeve 28 includes two sleeve shells 29 covering the outer wall of the valve stem sleeve 15 and assembled with each other, and the two sleeve shells 29 are fastened by bolts, and a sealing ring gasket 30 is fixed in the Haver sleeve 28, the valve stem sleeve 15 is penetrated by the sealing ring gasket 30 and the valve stem sleeve 15 axially slides on the Haver sleeve 28, and the outer wall of the valve stem sleeve 15 is provided with a first air inlet hole 31 connected with the first annular air channel 16, and a second air inlet hole 32 corresponding to the first air inlet hole 31 is opened on one of the sleeve shells 29, and one end of the high-temperature air inlet pipe 18 is welded to the sleeve shell 29 and communicated with the second air inlet hole 32 to prevent air leakage, and the first air inlet hole 31 corresponds to the second air inlet hole 32 when the valve stem 4 is closed, and the first air inlet hole 31 and the second air inlet hole 32 are misaligned in the axial direction when the valve stem 4 is opened.

[0032] An exhaust hole 33 corresponding to the second annular air passage 17 is formed on the valve cover 3 , and one end of the high-temperature exhaust pipe 25 is welded to the side wall of the valve cover 3 and communicated with the exhaust hole 33 .

[0033] A cooling chamber 34 and a cooling water pipe 35 fixed in the cooling chamber 34 are provided in the valve stem 4. The lower end of the cooling water pipe 35 is slightly higher than the bottom wall of the cooling chamber 34. A cooling water reflux channel 36 is formed between the outer wall of the cooling water pipe 35 and the inner wall and bottom wall of the cooling chamber 34. A cooling water inlet channel 37 is provided in the cooling water pipe 35. A cooling water inlet 38 and a cooling water outlet 39 are staggeredly arranged along the axial direction on the outer wall of the valve stem 4. The cooling water inlet 38 and the cooling water outlet 39 are respectively connected to the cooling water inlet channel 37 and the cooling water reflux channel 36. The cooling of the valve stem 4 and the cooling of the valve body 1 share a water circulation cooling mechanism, and water circulation cooling mechanisms can also be separately provided.

[0034] A jacket is provided outside the valve body 1 and a sandwich 40 is formed between the jacket and the valve body 1. The sandwich 40 is connected to a water circulation cooling mechanism. An inlet and an outlet pipe are provided on the sandwich 40 to connect to the water circulation cooling mechanism. The water circulation cooling mechanism is a prior art and is not elaborated on in detail. The water circulation cooling mechanism has the same principle as the water circulation heat exchange mechanism on the market, which can ensure that the outer surface temperature of the valve body 1 is ≤60°C. The valve body 1 is insulated and cooled six times through the insulation pipe assembly 43 and the conduit 12, which not only reduces heat energy loss but also maintains the safety of system operation.

[0035] The valve body 1 includes an upper valve 41 and a lower valve 42. The fluid channels 13 of the upper valve 41 and the lower valve 42 are located on the same oblique line. The valve stem 4 coincides with the central axis of the installation channel 14, and the angle formed between the central axis of the valve stem 4 and the central axis of the fluid channel 13 is 30°-45°. In this embodiment, 35° is preferred to reduce flow resistance and increase flow area. The valve seat 2 is fixed between the upper valve 41 and the lower valve 42. The lower end of the valve stem 4 is perpendicular to the valve port of the valve seat 2, and the lower end of the valve stem 4 is sealed with the valve port.

[0036] An insulating tube assembly 43 is arranged outside the conduit 12, and the insulating tube assembly 43 includes an inner sleeve 44 and an outer sleeve 45 arranged in sequence from the inside to the outside. The outer walls of the conduit 12, the inner sleeve 44 and the outer sleeve 45 are all provided with a liquid insulating coating 46, and the liquid insulating coating 46 can withstand a high temperature of 2000°C. Through insulation, the surface temperature of the conduit 12 can be reduced to 800-900°C. The material of the inner sleeve 44 is high-temperature alloy steel GH3128, which can withstand 1100°C. The wall thickness is designed to be 5mm. Its surface is still coated with the liquid insulating coating 46, and the surface temperature is reduced to 400-500°C. The material of the outer sleeve 45 is F304H austenitic stainless steel, which can withstand more than 600°C. The wall thickness is designed to be 5mm. It is coated with ZS-1 liquid insulating coating 46 with a temperature resistance of 800°C, and the surface temperature can be reduced to 100-150°C.

[0037] The heater 21 includes a heating box 47, a ceramic electric furnace core 48, a positioning ceramic base 49, a high-temperature resistance wire 50 and a box cover 51. The box cover 51 and the heating box 47 are sealed to form a heating chamber 52. The positioning ceramic base 49 is fixed in the heating box 47 and the outer wall of the positioning ceramic base 49 is in contact with the inner wall of the heating box 47. The ceramic electric furnace core 48 is inserted and limited in the positioning ceramic base 49. A ceramic insulating sleeve 53 is installed on the box cover 51. The high-temperature resistance wire 50 is built into the ceramic insulating sleeve 53 and the inner end of the high-temperature resistance wire 50 is connected to the ceramic electric furnace core 48.

[0038] The high-temperature air intake pipe 18 includes a high-temperature resistant pipe 54, a liquid heat-insulating coating 46 and an external sleeve 55, which can prevent the internal temperature from being lost and the outer wall temperature from being too high.

[0039] Working principle: In order to prevent the medium (high-temperature slag) from becoming viscous or even crystallizing after cooling, and adhering to the outer surface of the valve stem 4, affecting the movement of the valve stem 4, the outer surface of the valve stem 4 is purged with high-temperature inert gas. When the valve is closed, the conical surface at the lower end of the valve stem 4 and the sealing surface at the valve port of the valve seat 2 are sealed, and a signal is sent to the pneumatic high-temperature cut-off valve 1 20 and the pneumatic high-temperature cut-off valve 2 27 to open at the same time. At this time, the cylinders of the two cut-off valves are controlled by the solenoid valve to inflate the cylinders. When the pressure in the heater 21 is lower than 0.6Mpa, the pneumatic high-temperature cut-off valve 3 22 is automatically opened to fill the heater 21 with high-pressure nitrogen or high-pressure argon; when the gas temperature of the heater 21 is lower than 800℃, the high-temperature resistance wire 50 is connected and heating begins. At this time, the high-temperature airflow flows from top to bottom through the first annular air channel 16 between the outer circle of the valve stem 4 and the inner wall of the valve stem sleeve 15. The fluid channel 13 of the conduit 12 is full of high-temperature slag liquid. At this time, the high-temperature gas will blow away part of the slag, and the airflow forms a second annular air channel 17 between the outer circle of the valve stem sleeve 15 and the inner circle of the conduit 12, and flows from bottom to top to the lower end of the packing 56 box, and finally discharged into the gas storage tank 26, completing the entire purging action.

[0040] Control method when the pressure of heating box 47 changes:

[0041] ①: When the valve is in the closed state, the pneumatic high-temperature cut-off valve 1 20 and the pneumatic high-temperature cut-off valve 2 27 are in the open state at the same time. At this time, the gas in the heating box 47 will be purged through these two valves. Due to the continuous discharge of gas during the purging process, the pressure in the heating box 47 will gradually decrease. When the pressure value drops below 0.6MPa, the pressure sensor 23 installed in the heating box 47 will immediately feedback the signal to the PLC. After receiving the signal, the PLC will control the pneumatic high-temperature cut-off valve 3 22 to open, thereby replenishing the pressure to maintain the stable operation of the system.

[0042] ②: When the valve is in the open state, the pneumatic high-temperature cut-off valve 1 20 and the pneumatic high-temperature cut-off valve 2 27 will be closed at the same time. At this time, if the system is increasing the pressure (that is, the pneumatic high-temperature cut-off valve 3 22 may have been opened to supplement the pressure due to insufficient pressure), the pressure charging operation will continue in the heating box 47. As the pressure gradually increases, when the pressure value in the heating box 47 reaches the preset upper limit of 1.05MPa, the pressure sensor 23 installed in the heating box 47 will immediately send a signal to the PLC. After receiving the signal, the PLC will control the pneumatic high-temperature cut-off valve 3 22 to close, thereby cutting off the further replenishment of the external pressure source to the heating box 47, ensuring that the system will not operate abnormally or be dangerous due to overpressure.

[0043] ③: In special cases, if the pressure in the heating box 47 remains within the range of 0.6MPa to 1.05MPa after a round of purging, the pneumatic high-temperature cut-off valve 3 22 will not perform any action. Because within this pressure range, the system is already in a stable state, and no additional pressure replenishment or cut-off operation is required.

[0044] Control method when the temperature of the heating box 47 changes:

[0045] ①: When the valve is closed: the pneumatic high-temperature cut-off valve 1 20 and the pneumatic high-temperature cut-off valve 2 27 are opened for gas purging. When the pressure drops below 0.6MPa, the PLC controls the pneumatic high-temperature cut-off valve 3 22 to open and replenish the pressure. After the new gas is introduced, the temperature drops due to the mixed gas. If the temperature drops below 800℃, the temperature sensor 24 feeds back to the PLC, and the PLC starts heating the high-temperature resistance wire 50; if the temperature rises to 1050℃, the temperature sensor 24 feeds back to the PLC, and the PLC cuts off the high-temperature resistance wire 50.

[0046] ②: When the valve is open: pneumatic high-temperature cut-off valve 1 20 and pneumatic high-temperature cut-off valve 2 27 are closed. If the system needs to be pressurized (i.e. pneumatic high-temperature cut-off valve 3 22 may have been opened), when the pressure rises to 1.05MPa, the PLC closes the pneumatic high-temperature cut-off valve 3 22 to prevent overpressure. After the new gas is introduced, the temperature of the mixed gas will also drop. When the temperature is lower than 800℃, the temperature sensor 24 feeds back to the PLC, and the PLC starts heating the high-temperature resistance wire 50; if the temperature rises to 1050℃, the temperature sensor 24 feeds back to the PLC, and the PLC cuts off the high-temperature resistance wire 50.

[0047] ③: In special cases, if the internal pressure of the heating box 47 is still maintained between 800°C and 1050°C after completing a round of purging, heating is not required.

[0048] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A high-temperature liquid slag control valve system, comprising a valve body (1), a valve seat (2), a valve cover (3), a valve stem (4) and an electric actuator (5), wherein the valve seat (2) is arranged in the valve body (1) and the valve body (1) is provided with a fluid inlet (6) and a fluid outlet (7) at both ends, the inner end of the valve stem (4) corresponds to the valve port of the valve seat (2), the outer end of the valve stem (4) extends to the outside of the valve cover (3) and is connected to the electric actuator (5), the electric actuator (5) drives the valve stem (4) to rise and fall so that the valve port of the valve seat (2) is opened or closed, and the valve cover (3) is provided with a fixing bracket (8) for mounting the electric actuator (5), characterized in that: A purge mechanism (9) is also provided for purging the outer wall of the valve stem (4) when the valve stem (4) is in a closed state. The purge mechanism (9) comprises an air charging pipeline (10) and an air return pipeline (11). A conduit (12) is provided in the valve body (1). A fluid channel (13) and an installation channel (14) are provided in the conduit (12). The fluid channel (13) is in communication with a fluid inlet (6) and a fluid outlet (7). The valve stem (4) A valve stem sleeve (15) is fixed outside the guide tube (12) and is synchronously lifted and lowered therewith. The upper end of the valve stem sleeve (15) is a sealed end. The valve stem sleeve (15) is arranged in the installation channel (14). A first annular air channel (16) is formed between the inner wall of the valve stem sleeve (15) and the outer wall of the valve stem (4). A second annular air channel (17) is formed between the inner wall of the portion of the guide tube (12) corresponding to the valve stem (4) and the outer wall of the valve stem sleeve (15). The bottom of the first annular air channel (16) and The bottom of the second annular air passage (17) is connected. The charging pipeline (10) comprises a high-temperature air intake pipe (18) and an inert gas supply mechanism (19). One end of the high-temperature air intake pipe (18) is connected to the inert gas supply mechanism (19), and the other end is connected to the first annular air passage (16). The high-temperature air intake pipe (18) is connected in sequence with a pneumatic high-temperature shut-off valve 1 (20), a heater (21), and a pneumatic high-temperature shut-off valve 3 (22). The heater (21) is provided with a pressure sensor (23) and a temperature sensor (24) for detecting the internal pressure and temperature of the high-temperature air intake pipe (18). The return air pipeline (11) comprises a high-temperature exhaust pipe (25) and an air storage tank (26). One end of the high-temperature exhaust pipe (25) is connected to the second annular air passage (17). The high-temperature exhaust pipe (25) is connected with a pneumatic high-temperature shut-off valve 2 (27) located between the air storage tank (26) and the second annular air passage (17).

2. The high temperature liquid slag control valve system according to claim 1, characterized in that: The fixing bracket (8) is provided with a Havers sleeve (28) for connecting the valve stem sleeve (15) and the high-temperature air intake pipe (18). The Havers sleeve (28) includes two sleeve shells (29) which are covered on the outer wall of the valve stem sleeve (15) and assembled with each other. The two sleeve shells (29) are fastened by bolts. A sealing ring gasket (30) is fixed in the Havers sleeve (28). The valve stem sleeve (15) is inserted into the sealing ring gasket (30) and the valve stem sleeve (15) slides axially on the Havers sleeve (28). The valve stem sleeve (15) 5) The outer wall is provided with a first air inlet hole (31) connected to the first annular air channel (16); a second air inlet hole (32) corresponding to the first air inlet hole (31) is opened on one of the casings (29); one end of the high-temperature air inlet pipe (18) is welded to the casing (29) and is connected to the second air inlet hole (32); when the valve stem (4) is closed, the first air inlet hole (31) corresponds to the second air inlet hole (32); when the valve stem (4) is open, the first air inlet hole (31) and the second air inlet hole (32) are offset in the axial direction.

3. The high temperature liquid slag control valve system according to claim 1, characterized in that: The valve cover (3) is provided with an exhaust hole (33) corresponding to the second annular air passage (17); one end of the high-temperature exhaust pipe (25) is welded to the side wall of the valve cover (3) and communicates with the exhaust hole (33).

4. The high temperature liquid slag control valve system according to claim 1, 2 or 3, characterized in that: The valve stem (4) is provided with a cooling cavity (34) and a cooling water pipe (35) fixed in the cooling cavity (34); the lower end of the cooling water pipe (35) is slightly higher than the bottom wall of the cooling cavity (34); a cooling water reflux channel (36) is formed between the outer wall of the cooling water pipe (35) and the inner wall and bottom wall of the cooling cavity (34); a cooling water inlet channel (37) is provided in the cooling water pipe (35); a cooling water inlet (38) and a cooling water outlet (39) are arranged in an axially staggered manner on the outer wall of the valve stem (4); the cooling water inlet (38) and the cooling water outlet (39) are respectively connected to the cooling water inlet channel (37) and the cooling water reflux channel (36).

5. The high temperature liquid slag control valve system according to claim 4, characterized in that: A jacket is arranged outside the valve body (1), and an interlayer (40) is formed between the jacket and the valve body (1), and the interlayer (40) is connected to a water circulation cooling mechanism.

6. The high temperature liquid slag control valve system according to claim 1, 2 or 3, characterized in that: The valve body (1) comprises an upper valve (41) and a lower valve (42), the fluid passages (13) of the upper valve (41) and the lower valve (42) are located on the same oblique line, the center axis of the valve stem (4) coincides with the center axis of the installation passage (14), and the angle formed between the center axis of the valve stem (4) and the center axis of the fluid passage (13) is 30°-45°, the valve seat (2) is fixed between the upper valve (41) and the lower valve (42), the lower end of the valve stem (4) is perpendicular to the valve port of the valve seat (2), and the lower end of the valve stem (4) is in sealing cooperation with the valve port.

7. The high temperature liquid slag control valve system according to claim 1, 2 or 3, characterized in that: A heat-insulating tube assembly (43) is arranged outside the conduit (12), and the heat-insulating tube assembly (43) comprises an inner sleeve (44) and an outer sleeve (45) arranged in sequence from the inside to the outside. The outer walls of the conduit (12), the inner sleeve (44) and the outer sleeve (45) are all provided with a liquid heat-insulating coating (46).

8. The high temperature liquid slag control valve system according to claim 1, characterized in that: The heater (21) comprises a heating box (47), a ceramic electric furnace core (48), a positioning ceramic base (49), a high-temperature resistance wire (50) and a box cover (51); the box cover (51) and the heating box (47) are sealed to form a heating chamber (52); the positioning ceramic base (49) is fixed in the heating box (47) and the outer wall of the positioning ceramic base (49) is in contact with the inner wall of the heating box (47); the ceramic electric furnace core (48) is inserted and limited in the positioning ceramic base (49); a ceramic insulating sleeve (53) is installed on the box cover (51); the high-temperature resistance wire (50) is built in the ceramic insulating sleeve (53) and the inner end of the high-temperature resistance wire (50) is connected to the ceramic electric furnace core (48).

9. The high temperature liquid slag control valve system according to claim 1, characterized in that: The high-temperature air intake pipe (18) comprises a high-temperature resistant pipe (54), a liquid heat-insulating coating (46) and an external sleeve (55).

10. The high temperature liquid slag control valve system according to claim 1, characterized in that: The inert gas supply mechanism (19) is a high-pressure nitrogen bottle or a high-pressure argon bottle.

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