Water-cooled explosion-proof valve in converter waste heat boiler

Abstract

The invention discloses a water-cooled explosion-proof valve in a converter waste heat boiler, wherein the side wall of the valve cover base is provided with a water-cooling groove with an open outer end, and is also provided with a water-cooling groove water inlet and an overflow port connected to the inner cavity of the water-cooling groove, the overflow port is located on the outer wall of the water-cooling groove, a water-cooling cavity closed all around is provided in the explosion-proof valve cover, a valve cover water inlet and a valve cover water outlet connected to the water-cooling cavity are provided on the explosion-proof valve cover, an annular circumferential plug plate is provided on the inner end wall of the explosion-proof valve cover, and a limit guide device is also provided which can control the rotation angle of the explosion-proof valve cover and make the rotated explosion-proof valve cover fall back along the original lifting trajectory under the action of its own gravity and then cover the outer port of the valve cover base and the outer port of the water-cooling groove; when the converter waste heat boiler is working normally, the explosion-proof valve cover covers the outer port of the valve cover base and the outer port of the water-cooling groove, the inner end of the circumferential plug plate is located in the cooling water in the water-cooling groove, and a water seal is formed between the explosion-proof valve cover and the valve cover base. The water-cooled explosion-proof valve has high heat resistance and sealing reliability.

Description

Technical Field

[0001] The invention relates to the field of converter waste heat boilers, and in particular to explosion-proof valves therein. Background Art

[0002] The converter waste heat boiler is a flue-type oxygen converter waste heat boiler, which is widely used in various steel plants to recover the heat from the coal gas, high-temperature flue gas and smoke generated during steelmaking in the converter of the steel plant. The converter waste heat boiler includes: a steam drum, a movable smoke hood, a furnace mouth section flue, an inclined section flue, and a tail section flue. Generally, the inlet flue gas temperature of the converter waste heat boiler is about 1450-1650℃. After the converter furnace mouth flue gas enters from the movable smoke hood, it is continuously cooled by the water-cooled walls of the furnace mouth section flue, the inclined section flue, and the tail section flue in turn. The flue gas temperature gradually decreases, and when it reaches the tail section flue, the temperature drops to about 800℃. When the three conditions of flue gas temperature, flue gas concentration and sparks in the flue gas in the tail section flue meet the requirements at the same time, an explosion point may appear inside the tail section flue. Therefore, it is necessary to set an explosion-proof valve on the tail section flue to quickly release the pressure after the explosion.

[0003] The explosion-proof valve commonly used at present is a gravity-type explosion-proof valve, including: a valve cover base that can be fixed on the water-cooled wall around the explosion-proof port of the tail section flue and is open at both the inner and outer ends, an explosion-proof valve cover hinged to the valve cover base, an annular sealing groove is provided on the outer end wall of the valve cover base, a ceramic fiber rope is embedded in the sealing groove, and a circle of protrusions is provided on the inner end wall of the explosion-proof valve cover. When the explosion-proof valve cover covers the outer port of the valve cover base and the annular protrusion on the inner end wall extends into the sealing groove, the explosion-proof valve seals the explosion-proof port. An annular water-cooled groove that is closed all around is provided on the outer periphery of the side wall of the valve cover base, and a water inlet and a water outlet that are connected to the inner cavity of the water-cooled groove are provided on the water-cooled groove. The explosion-proof valve cover is hollow inside and filled with heat-resistant fillers, which can reduce the temperature of the explosion-proof valve when the converter waste heat boiler is working and prevent the explosion-proof valve cover and the valve cover base from cracking due to heat. After an explosion, the pressure in the tail section of the flue rises rapidly, pushing the explosion-proof valve cover open. After the pressure is released, the explosion-proof valve cover falls back by its own gravity. There is also a limiter on the valve cover base, usually a vertical steel plate, to prevent the explosion-proof valve cover from continuing to fall to the outside of the valve cover base after the flip angle exceeds 90°, causing safety risks. This explosion-proof valve has the following disadvantages when in use: First, the explosion-proof valve cover and the valve cover base are hingedly connected, and the explosion-proof valve cover cannot rotate at a too large angle so that the explosion-proof valve cover can fall back onto the valve cover base by its own gravity. However, when the pressure is too high and the explosion-proof valve flips over at an excessively large angle and contacts the limiter, the impact force after the contact between the explosion-proof valve cover and the limiter will cause the explosion-proof valve cover to fall back, but due to the small falling power, the explosion-proof valve cover will only fall back slowly and gently cover the top of the valve cover base. After the collision, there is a high probability that the falling trajectory and the lifting trajectory will deviate, making it difficult for the protrusion on the inner wall of the explosion-proof valve cover to accurately extend into the sealing groove after the explosion-proof valve cover falls back. Thereafter, when the converter is working normally, a "jumping cover" phenomenon will occur, and the explosion-proof port cannot be sealed, that is, this sealing method in which the annular protrusion on the inner end wall of the explosion-proof valve cover and the sealing groove on the outer end wall of the valve cover base cooperate with each other will cause the explosion-proof valve cover and the limiter to fall back when the pressure is too high. The sealing reliability is not high when the explosion-proof valve cover falls back after collision between the limiting members; second, even if the pressure generated by the explosion is small, the valve cover flipping angle is small, and the explosion-proof valve cover does not contact the limiting member, although the valve cover base can fall back by its own gravity after flipping, since the explosion-proof valve cover and the valve cover base are hinged, there is still a high probability that the falling trajectory and the lifting trajectory will deviate, making it difficult for the protrusion on the inner wall of the explosion-proof valve cover to accurately extend into the sealing groove after the explosion-proof valve cover falls back, and the explosion-proof port cannot be sealed, that is: this sealing method in which the annular protrusion on the inner end wall of the explosion-proof valve cover and the sealing groove on the outer end wall of the valve cover base cooperate with each other has low sealing reliability when no collision and falling back occurs between the explosion-proof valve cover and the limiting member; third, although the explosion-proof valve cover is filled with heat-resistant filler, it is still prone to deformation and cracking when heated, and the sealing reliability of the explosion-proof valve cover and the valve cover base will be reduced after deformation. Summary of the invention

[0004] The purpose of the present invention is to provide a water-cooled explosion-proof valve in a converter waste heat boiler, which is not easy to deform and crack when heated. When an explosion occurs in the tail section flue, the explosion-proof valve cover can quickly open to release the pressure and return along the original lifting trajectory to seal and cover the outer port of the valve cover base, thereby greatly improving the heat resistance and sealing reliability of the water-cooled explosion-proof valve.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a water-cooled explosion-proof valve in a converter waste heat boiler comprises: a valve cover base which can be fixed on the water-cooled wall around the explosion-proof port of the tail section flue and is open at both inner and outer ends; an explosion-proof valve cover is arranged on the outer end opening of the valve cover base; the explosion-proof valve cover can be lifted up and turned over to open, and can also be turned down and covered on the outer port opening; the characteristic is: a water-cooling groove with an open outer end is arranged on the periphery of the side wall of the valve cover base; a water-cooling groove water inlet and an overflow port which are connected to the inner cavity of the water-cooling groove are also arranged; the overflow port is located on the outer side wall of the water-cooling groove; a water-cooling cavity which is closed on all sides is arranged in the explosion-proof valve cover; a valve cover water inlet and a valve cover water outlet which are connected to the water-cooling cavity are arranged on the explosion-proof valve cover; the inner An annular circumferential plug plate is arranged on the end wall, and a limiting guide device is also arranged which can control the rotation angle of the explosion-proof valve cover and make the rotated explosion-proof valve cover fall back along the original lifting trajectory under the action of its own gravity and then cover the outer port of the valve cover base and the outer port of the water cooling groove; the position of the plug plate meets the following requirements: when the converter waste heat boiler is working normally, the explosion-proof valve cover covers the outer port of the valve cover base and the outer port of the water cooling groove, at this time, the circumferential plug plate is located in the inner cavity of the water cooling groove, and the inner end of the circumferential plug plate is located in the cooling water in the water cooling groove, so that a water seal is formed between the explosion-proof valve cover and the valve cover base, and when an explosion occurs in the tail section flue, the circumferential plug plate will not contact the valve cover base during the process of the explosion-proof valve cover rising upward and falling downward.

[0006] Further, the water-cooled explosion-proof valve in the aforementioned converter waste heat boiler, wherein: the limit guide device includes: a limit guide seat that can be fixedly installed on the water-cooled wall around the flue explosion-proof port, the two opposite side walls of the limit guide seat are connected to the valve cover base, each side wall is provided with a circular arc through groove, the two ends of the guide rod fixed on the outer end wall of the explosion-proof valve cover are respectively extended into the circular arc through groove and then extended out, in the process of the explosion-proof valve cover being lifted upward and dropped downward, the explosion-proof valve cover rotates between the two opposite side walls of the limit guide seat, and the guide rod moves in the circular arc through groove, and the curvature of the circular arc through groove is the limited rotation angle.

[0007] Furthermore, the water-cooled explosion-proof valve in the aforementioned converter waste heat boiler, wherein: the position of the valve cover water outlet meets the following requirements: when the converter waste heat boiler is working normally, the explosion-proof valve cover covers the outer port of the valve cover base and the outer port of the water cooling tank. At this time, the valve cover water outlet is located in the inner cavity of the water cooling tank, and the valve cover water outlet is the water inlet of the water cooling tank. When an explosion occurs in the tail section flue, during the process of the explosion-proof valve cover rising upward and falling downward, the water flowing out from the valve cover water outlet can flow into the inner cavity of the water cooling tank.

[0008] Furthermore, in the aforementioned water-cooled explosion-proof valve in the converter waste heat boiler, a limiting groove connected to the outer end of the corresponding arc-shaped through groove is respectively provided on two opposite side walls of the limiting guide seat, a limiting block is provided in the limiting groove, and one end of the rubber block is embedded in the limiting block through a limiting hole provided in the limiting block; when the explosion-proof valve cover is lifted upward to the outer end of the arc-shaped through groove, the guide rod contacts the other end of the rubber block.

[0009] Further, the water-cooled explosion-proof valve in the aforementioned converter waste heat boiler, wherein: a rotating shaft is arranged on the mounting seat at the bottom of the limiting guide seat, two opposite side walls are fixedly connected to the mounting seat, the rotating shaft is movably arranged on the mounting seat between the two opposite side walls through a bearing seat, and two connecting ears are arranged in parallel and at intervals on the outer end wall of the explosion-proof valve cover, the two connecting ears are sleeved on the rotating shaft, so that the explosion-proof valve cover is hinged to the mounting seat through the rotating shaft.

[0010] Furthermore, in the aforementioned water-cooled explosion-proof valve in the converter waste heat boiler, a plurality of partitions are arranged in the water-cooling chamber of the explosion-proof valve cover, so that the cooling water entering the water-cooling chamber can flow in a circuitous manner and finally flow out from the water outlet of the valve cover.

[0011] Furthermore, the water-cooled explosion-proof valve in the aforementioned converter waste heat boiler, wherein: a floating water tank that can be fixed on the water-cooled wall outside the valve cover base is also provided, the floating water tank is connected to the inner cavity of the water-cooled tank through a floating water pipe, a floating switch is installed on the floating water tank, the floating switch is communicated with the alarm, and the float of the floating switch is located in the floating water tank; when the water level in the floating water tank is lower than the set minimum water level or higher than the set maximum water level, the floating switch will send a signal to the alarm.

[0012] Furthermore, in the aforementioned water-cooled explosion-proof valve in the converter waste heat boiler, a drain port communicating with the inner cavity of the water-cooling tank is provided at the bottom of the outer wall of the water-cooling tank, and a drain valve is provided on the drain port.

[0013] Furthermore, in the aforementioned water-cooled explosion-proof valve in the converter waste heat boiler, the overflow port is connected to the water inlet pipe of the overflow bucket, so that the cooling water flowing out of the overflow port flows into the overflow bucket.

[0014] Furthermore, the water-cooled explosion-proof valve in the aforementioned converter waste heat boiler, wherein: a travel switch for monitoring the rotation angle of the explosion-proof valve cover is also provided, the travel switch is arranged on the side wall and is communicated with the alarm, and the trigger arm that triggers the travel switch is connected to the guide rod.

[0015] The beneficial effects of the present invention are as follows: 1. A water-cooling cavity is arranged in the explosion-proof valve cover, and a water-cooling groove with an open outer end is arranged on the periphery of the side wall of the valve cover base. A ring-shaped circumferential plug plate is arranged on the inner end wall of the explosion-proof valve cover, and a limiting guide device is also arranged. The above structure enables the inner end of the circumferential plug plate to be located in the cooling water in the water-cooling groove when the converter waste heat boiler is working normally, so that a water seal is formed between the explosion-proof valve cover and the valve cover base. This water seal has high reliability and low cost. The high-temperature flue gas entering the valve cover base 1 from the explosion-proof port is first cooled by the cooling water in the water-cooling groove, and then cooled by the cooling water in the water-cooling cavity, so that the explosion-proof valve cover and the valve cover base are not easily deformed and cracked by heat, thereby improving the service life of the water-cooled explosion-proof valve. After an explosion occurs, the limiting guide device can control the rotation angle of the explosion-proof valve cover, and enable the rotated explosion-proof valve cover to fall back along the original lifting trajectory under the action of its own gravity and then seal and cover the outer port of the valve cover base and the outer port of the water-cooling groove, thereby further improving the sealing reliability. Second, the further advantage of the present invention is that: the two opposite side walls of the limit guide seat are respectively provided with an arc-shaped through groove, and the two ends of the guide rod fixed on the outer end wall of the explosion-proof valve cover are respectively extended into the arc-shaped through groove and then extended out, and the curvature of the arc-shaped through groove is the limited rotation angle, and the limit guide device composed of the guide rod and the arc-shaped through groove has a simple structure and low manufacturing cost. Third, the further advantage of the present invention is that the arrangement method of the valve cover water outlet being the water inlet of the water cooling tank also reduces the manufacturing cost of the water-cooled explosion-proof valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the water-cooled explosion-proof valve in the converter waste heat boiler of the present invention;

[0017] Figure 2 for Figure 1 A schematic diagram of the top view of the water-cooled explosion-proof valve;

[0018] Figure 3 for Figure 1 The right view structural diagram of the water-cooled explosion-proof valve in FIG.

[0019] Figure 4 It is a structural diagram of the explosion-proof valve cover. DETAILED DESCRIPTION

[0020] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0021] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the water-cooled explosion-proof valve in the converter waste heat boiler comprises: a valve cover base 1 which can be fixed on the water-cooled wall around the explosion-proof port of the tail section flue and is open at both inner and outer ends; an explosion-proof valve cover 2 is arranged on the open outer end of the valve cover base 1; the explosion-proof valve cover 2 can be lifted up and flipped over to open, or can be flipped down to cover the open outer end; in actual production, the explosion-proof valve cover 2 can be hingedly connected to the valve cover base 1, or can be hingedly connected to the water-cooled wall around the explosion-proof port; a water-cooling groove 12 with an open outer end is arranged on the periphery of the side wall 11 of the valve cover base; in the present embodiment, the side wall 11 of the valve cover base 1 is the inner side wall of the water-cooling groove 12; an overflow port 122 communicating with an inner cavity 123 of the water-cooling groove is arranged on an outer side wall 121 of the water-cooling groove; a water-cooling cavity 21 closed on all sides is arranged inside the explosion-proof valve cover 2; a valve cover water inlet communicating with the water-cooling cavity 21 is arranged on the explosion-proof valve cover 2 22 and valve cover water outlet 23, an annular circumferential plug plate 24 is arranged on the inner end wall of the explosion-proof valve cover 2, and a limiting guide device is also arranged which can control the rotation angle of the explosion-proof valve cover and make the rotated explosion-proof valve cover 2 fall back along the original lifting trajectory under the action of its own gravity and then cover the outer port of the valve cover base 1 and the outer port of the water cooling groove 12; the positions of the circumferential plug plate 24 and the valve cover water outlet 23 meet the following requirements: when the converter waste heat boiler is working normally, the explosion-proof valve cover 2 covers the outer port of the valve cover base 1 and the outer port of the water cooling groove 12, at this time, the circumferential plug plate 24 is located in the water cooling groove inner cavity 123, and the inner end of the circumferential plug plate 24 is located in the cooling water in the water cooling groove 12, so that a water seal is formed between the explosion-proof valve cover 2 and the valve cover base 1, at this time, the valve cover water outlet 23 is also located in the water cooling groove inner cavity and is connected with the water cooling groove inner cavity 123. When an explosion occurs in the tail section flue, during the process of the explosion-proof valve cover 2 rising upward and falling back downward, the circumferential plug plate 24 will not contact the valve cover base 1, and the water flowing out of the valve cover water outlet 23 can flow into the water-cooling tank cavity 123. The sealing method of the water seal is highly reliable and low in cost. The setting method of the valve cover water outlet 23 being the water inlet of the water cooling tank also reduces the manufacturing cost of the water-cooled explosion-proof valve. In order to facilitate the discharge of cooling water in the water cooling tank cavity 123 during maintenance, in this embodiment, a sewage outlet 13 connected to the water cooling tank cavity 123 is provided at the bottom of the water cooling tank outer wall 121, and a sewage valve is provided on the sewage outlet 13.

[0022] In this embodiment, the position limiting guide device comprises: a position limiting guide seat 3 that can be fixedly mounted on the water-cooled wall around the explosion-proof opening of the flue, two opposite side walls 31 of the position limiting guide seat 3 are welded to the outer side wall of the water-cooled groove 12, each side wall 31 is provided with a circular arc through groove 32, and the two ends of the guide rod 4 fixed on the outer end wall of the explosion-proof valve cover 2 are respectively extended into the circular arc through groove 32 and then extended out, and in the process of the explosion-proof valve cover 2 lifting upward and falling downward, the explosion-proof valve cover 2 rotates between the two opposite side walls 31 of the position limiting guide seat 3, and the guide rod 4 moves in the circular arc through groove 32, and the curvature of the circular arc through groove 32 is the limited rotation angle. Since the entire process of explosion pressure relief takes a short time, in actual use, the curvature range of the circular arc through groove is 55-65°, and the circular arc through groove 32 within this curvature range can ensure that the explosion pressure relief is complete, and the explosion-proof valve cover can also fall back along the circular arc through groove 32 by its own gravity.

[0023] like Figure 1 , Figure 3 As shown, two opposite side walls 31 of the limiting guide seat 3 are respectively provided with a limiting groove 33 connected with the outer end of the corresponding arc-shaped through groove 32, and a limiting block 34 is provided in the limiting groove, and one end of the rubber block 35 is embedded in the limiting block 34 through a limiting hole provided in the limiting block 34; when the explosion-proof valve cover 2 is lifted upward to the outer end of the arc-shaped through groove 32, the guide rod 4 can contact the other end of the rubber block 35. The rubber block 35 can form a buffer when limiting, thereby protecting the side wall 31 and the guide rod 4.

[0024] In this embodiment, in order to better install the two side walls 31, a mounting seat 36 is further provided at the bottom of the limiting guide seat. The mounting seat 36 can be fixed on the water-cooled wall around the smoke duct explosion-proof port. The two side walls 31 are fixedly connected to the mounting seat 36. The rotating shaft 37 is movably arranged on the mounting seat 36 between the two opposite side walls 31 through a bearing seat. Two connecting ears 25 are arranged in parallel and at intervals on the outer end wall of the explosion-proof valve cover 2. The two connecting ears 25 are sleeved on the rotating shaft 37, so that the explosion-proof valve cover 2 is hinged to the mounting seat 36 through the rotating shaft 37, so that the explosion-proof valve cover 2 with a larger dead weight can rotate more smoothly.

[0025] like Figure 4 As shown, a plurality of partitions 26 are arranged in the water cooling chamber 21 of the explosion-proof valve cover, so that the cooling water entering the water cooling chamber 21 can flow in a circuitous manner and finally flow out from the valve cover water outlet 23, thereby better cooling the explosion-proof valve cover 2.

[0026] In this embodiment, a floating water tank 5 is also provided which can be fixed on the water-cooled wall around the explosion-proof opening of the flue. The floating water tank is connected to the inner cavity 123 of the water-cooled tank through a floating water pipe 51. A floating switch is installed on the floating water tank 5. The floating switch is connected to the alarm in communication. The floating ball of the floating switch is located in the floating water tank. When the water level in the floating water tank 5 is lower than the set minimum water level or higher than the set maximum water level, the floating switch will send a signal to the alarm. The provision of the floating switch and the floating water tank 5 can ensure the stability of the water seal between the valve cover base 1 and the explosion-proof valve cover 2.

[0027] In order to recycle water resources, the overflow port 122 is connected to the water inlet pipe of the overflow bucket 6, so that the cooling water flowing out of the overflow port 122 flows into the overflow bucket 6, and the water in the overflow bucket 6 can enter the water-cooled explosion-proof valve through the valve cover water inlet 22 after being cooled. In this embodiment, two overflow ports 122 are provided, and the two overflow ports 122 are respectively connected to the water inlet pipe of one overflow bucket 6.

[0028] In order to inform the operator that an explosion has occurred in the tail section flue, a travel switch 7 is provided to monitor the rotation angle of the explosion-proof valve cover 2, and the travel switch 7 is connected to the alarm. When an explosion occurs in the tail section flue, the rotation angle of the explosion-proof valve cover 2 will be different depending on the severity of the explosion. Therefore, in actual use, the trigger angle of the installation position of the travel switch 7 is set to be smaller, usually 20°. In this embodiment, the travel switch 7 is set on the side wall 31, and the travel switch 7 can adopt the Delixi LXK3-20S / T model adjustable roller arm limit travel switch, and the trigger arm 71 that triggers the travel switch 7 is connected to the guide rod 4.

[0029] The advantages of the present invention are as follows: 1. The water cooling cavity 21 is arranged in the explosion-proof valve cover 2, and the outer side wall 11 of the valve cover base is provided with a water cooling groove 12 with an open outer end. The inner end wall of the explosion-proof valve cover 2 is provided with a ring-shaped circumferential plug plate 24, and a limited position guide device is also provided. The above structure enables the inner end of the circumferential plug plate 24 to be located in the cooling water in the water cooling groove 12 when the converter waste heat boiler is working normally, so that a water seal is formed between the explosion-proof valve cover 2 and the valve cover base 1. This water seal has high reliability and low cost, and is easy to be used for cooling water. The high-temperature flue gas entering the valve cover base 1 is first cooled by the cooling water in the water-cooling groove 12, and then cooled by the cooling water in the water-cooling chamber 21, so that the explosion-proof valve cover 2 and the valve cover base 1 are not easily deformed and cracked by heat, and the service life of the water-cooled explosion-proof valve is improved. After the explosion occurs, the limit guide device can control the rotation angle of the explosion-proof valve cover 2, and make the rotated explosion-proof valve cover 2 fall back along the original lifting trajectory under the action of its own gravity and then seal and cover the outer port of the valve cover base 1 and the outer port of the water-cooling groove 12, further improving the sealing reliability. 2. A further advantage of the present invention is that: a circular arc through groove 32 is respectively provided on the two opposite side walls 31 of the limit guide seat 3, and the two ends of the guide rod 4 fixed on the outer end wall of the explosion-proof valve cover 2 are respectively extended into the circular arc through groove 32 and then extended, and the curvature of the circular arc through groove 32 is the limited rotation angle. The limit guide device matched with the guide rod 4 and the circular arc through groove 32 has a simple structure and low manufacturing cost. 3. A further advantage of the present invention is that the valve cover water outlet 23 is arranged as the water inlet of the water cooling tank, which also reduces the manufacturing cost of the water-cooled explosion-proof valve.

Claims

1. The water-cooled explosion-proof valve in the converter waste heat boiler includes: A valve cover base which can be fixed on the water-cooled wall around the explosion-proof port of the tail section flue and is open at both the inner and outer ends; an explosion-proof valve cover is arranged on the outer end opening of the valve cover base; the explosion-proof valve cover can be lifted up and turned over to open, and can also be turned down to cover the outer port opening; the characteristic is that: a water-cooling groove with an open outer end is arranged on the periphery of the side wall of the valve cover base; a water-cooling groove water inlet and an overflow port which are connected to the inner cavity of the water-cooling groove are also arranged; the overflow port is located on the outer side wall of the water-cooling groove; a water-cooling cavity which is closed all around is arranged in the explosion-proof valve cover; a valve cover water inlet and a valve cover water outlet which are connected to the water-cooling cavity are arranged on the explosion-proof valve cover; an annular circumferential plug plate is arranged on the inner end wall of the explosion-proof valve cover; a controllable A limit guide device is provided to control the rotation angle of the explosion-proof valve cover, and make the rotated explosion-proof valve cover fall back along the original lifting trajectory under the action of its own gravity and then cover the outer port of the valve cover base and the outer port of the water cooling tank; the position of the circumferential plug plate meets the following requirements: when the converter waste heat boiler is working normally, the explosion-proof valve cover covers the outer port of the valve cover base and the outer port of the water cooling tank, at this time, the circumferential plug plate is located in the inner cavity of the water cooling tank, and the inner end of the circumferential plug plate is located in the cooling water in the water cooling tank, so that a water seal is formed between the explosion-proof valve cover and the valve cover base. When an explosion occurs in the tail section flue, the circumferential plug plate will not contact the valve cover base during the process of the explosion-proof valve cover lifting upward and falling downward; The limit guide device comprises: a limit guide seat which can be fixedly mounted on the water-cooled wall around the explosion-proof opening of the flue, two opposite side walls of the limit guide seat being connected to the valve cover base, each side wall being provided with an arc-shaped through groove, two ends of a guide rod fixed on the outer end wall of the explosion-proof valve cover respectively extending into the arc-shaped through groove and then extending out, in the process of the explosion-proof valve cover being lifted upward and dropped downward, the explosion-proof valve cover rotates between the two opposite side walls of the limit guide seat, and the guide rod moves in the arc-shaped through groove, and the curvature of the arc-shaped through groove is the limited rotation angle.

2. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1 is characterized in that: The position of the valve cover water outlet meets the following requirements: when the converter waste heat boiler is working normally, the explosion-proof valve cover covers the outer port of the valve cover base and the outer port of the water cooling tank. At this time, the valve cover water outlet is located in the inner cavity of the water cooling tank, and the valve cover water outlet is the water inlet of the water cooling tank. When an explosion occurs in the tail section flue, during the process of the explosion-proof valve cover rising upward and falling downward, the water flowing out of the valve cover water outlet can flow into the inner cavity of the water cooling tank.

3. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1 is characterized in that: A limiting groove connected to the outer end of the corresponding arc-shaped through groove is also respectively provided on the two opposite side walls of the limiting guide seat, a limiting block is provided in the limiting groove, and one end of the rubber block is embedded in the limiting block through a limiting hole provided in the limiting block; when the explosion-proof valve cover is lifted upward to the outer end of the arc-shaped through groove, the guide rod contacts the other end of the rubber block.

4. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1, characterized in that: A rotating shaft is arranged on the mounting seat at the bottom of the limiting guide seat, and two opposite side walls are fixedly connected to the mounting seat. The rotating shaft is movably arranged on the mounting seat between the two opposite side walls through a bearing seat, and two connecting ears are arranged in parallel and at intervals on the outer end wall of the explosion-proof valve cover. The two connecting ears are sleeved on the rotating shaft, so that the explosion-proof valve cover is hinged to the mounting seat through the rotating shaft.

5. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1, 2, 3 or 4, characterized in that : Several partitions are arranged in the water-cooling chamber of the explosion-proof valve cover, so that the cooling water entering the water-cooling chamber can flow in a circuitous way and finally flow out from the water outlet of the valve cover.

6. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1, 2, 3 or 4, characterized in that : A floating water tank is also provided which can be fixed on the water-cooled wall outside the valve cover base. The floating water tank is connected to the inner cavity of the water-cooled tank through a floating water pipe. A floating switch is installed on the floating water tank. The floating switch is communicated with the alarm. The float ball of the floating switch is located in the floating water tank. When the water level in the floating water tank is lower than the set minimum water level or higher than the set maximum water level, the floating switch will send a signal to the alarm.

7. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1, 2, 3 or 4, characterized in that: A sewage outlet communicated with the inner cavity of the water cooling tank is arranged at the bottom of the outer wall of the water cooling tank, and a sewage valve is arranged on the sewage outlet.

8. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1, 2, 3 or 4, characterized in that: The overflow port is communicated with the water inlet pipe of the overflow bucket, so that the cooling water flowing out of the overflow port flows into the overflow bucket.

9. The water-cooled explosion-proof valve in the converter waste heat boiler according to claim 1, 2, 3 or 4, characterized in that: A travel switch for monitoring the rotation angle of the explosion-proof valve cover is also provided. The travel switch is arranged on the side wall of the limit guide seat and is communicated with the alarm. The trigger arm for triggering the travel switch is connected to the guide rod.

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