Cryogenic storage tank perlite supplementary filling pipe port blind plate ball valve interchange device

Abstract

The present invention discloses a device for exchanging blind plates and ball valves for filling pipe ports with perlite in low-temperature storage tanks, which relates to a device for replacing blind plates of perlite filling ports with ball valves or replacing ball valves with blind plates when perlite is added after the cold layer of large and medium-sized low-temperature liquid storage tanks settles. The device for exchanging blind plates and ball valves for filling pipe ports with perlite in low-temperature storage tanks comprises an air inlet valve, a safety valve, a pressure gauge, an exhaust valve, a valve box, an observation hole, a glove hole a, a glove hole b, a bolt hole a, a bolt hole b, a positioning pin, a locking device, a valve bottom plate a, a valve bottom plate b, a sliding rod, a connecting plate and a safety ball valve. The present invention has a simple structure and is easy to operate.

Description

Technical Field

[0001] The invention relates to a device, in particular to a device for replacing a perlite filling port blind plate with a ball valve or a ball valve with a blind plate when perlite is added after the cold insulation layer of a large or medium-sized low-temperature liquid storage tank settles. Background Art

[0002] Entering the 21st century, China has built a large number of cryogenic storage tanks. As time goes by, the cold insulation layer of the cryogenic storage tanks gradually settles, affecting the thermal insulation of the storage tanks. The evaporation of cryogenic liquids has increased significantly, and the pressure inside the tanks has increased. In order to ensure the safe operation of the device, the gas needs to be vented or compressed into liquid again, wasting a lot of energy. Therefore, cryogenic liquid storage tank devices that have frost and ice on the outer wall of the tank due to the sedimentation of expanded perlite used for thermal insulation should be filled with insulating perlite in time to ensure that the insulation layer restores its normal insulation effect, reduce the evaporation of cryogenic liquids, and reduce the energy consumption of venting or reliquefaction.

[0003] The internal evaporation gas pressure of the operating cryogenic liquid storage tank is usually above 15Kpa. The perlite filling port for insulation is usually closed with a blind plate. In order to realize the supplementary filling of perlite for insulation, the blind plate must first be replaced with a filling control ball valve to facilitate the installation and switching control of the perlite supplementary filling delivery pipeline.

[0004] The evaporation gas pressure inside the operating cryogenic liquid storage tank is very high. In the online state, how to safely replace the blind plate with a ball valve has become an urgent technical problem to be solved. There is no technical solution to this problem in the prior art. Summary of the invention

[0005] In view of this, the purpose of the present invention is to solve the problem of replacing the blind plate of the perlite filling port of the cryogenic storage tank with a ball valve in an online state when the evaporation gas pressure inside the cryogenic liquid storage tank is less than or equal to 8KPa, so as to supplement the perlite filling. After the perlite supplementary filling is completed, the ball valve is replaced with the blind plate again.

[0006] The present invention provides a blind plate ball valve interchange device for perlite supplementary filling pipe orifice of a low-temperature storage tank. The blind plate ball valve interchange device for perlite supplementary filling pipe orifice of a low-temperature storage tank comprises an intake valve, a safety valve, a pressure gauge, an exhaust valve, a valve box, an observation hole, a glove hole a, a glove hole b, a bolt hole a, a bolt hole b, a positioning pin, a locking device, a valve bottom plate a, a valve bottom plate b, a sliding rod, a connecting plate and a safety ball valve. The output end of the intake valve is welded to the input end of the valve box, the safety valve is welded to the input end of the valve box, the pressure gauge is welded to the input end of the valve box, the exhaust valve is welded to the input end of the valve box, the observation hole is welded to the input end of the valve box, the glove hole a and the glove hole b are welded to the input end of the valve box, and the locking device is connected to the valve bottom plate a and the valve bottom plate b.

[0007] Preferably, the locking device is connected to the valve bottom plate a and the valve bottom plate b by threads, and a sealing gasket is added at the connection.

[0008] Preferably, the valve bottom plate a and the valve bottom plate b are located below the valve box and are symmetrically distributed on both sides. The valve bottom plate a and the valve bottom plate b are positioned and bolted together through positioning pins, bolt holes a and bolt holes b, and all contact surfaces are sealed with sealing strips.

[0009] Preferably, a sealing valve box and valve bottom plate a and valve bottom plate b are used to form a pressure-resistant closed working space through a locking device, and the perlite filling pipe mouth blind plate and the safety ball valve are interchangeable through the glove hole a, glove hole b and the up and down sliding rod.

[0010] It can be seen from the technical solutions provided by the present invention that the present invention has the following technical effects: the present invention has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic structural diagram of a low-temperature storage tank perlite supplementary filling pipe port blind plate ball valve interchangeable device provided by the present invention.

[0012] 1-intake valve 2-safety valve 3-pressure gauge 4-exhaust valve 5-valve box

[0013] 6-Observation hole 7-Glove hole a 8-Bolt hole a 9-Location pin 10-Locking device

[0014] 11-valve bottom plate a 12-sliding rod 13-connecting plate 14-safety ball valve 15-blind plate

[0015] 16-flange gasket 17-bolt nut 18-filling port flange 19-filling pipe

[0016] 20-valve bottom plate b 21-glove hole b 22-bolt hole b DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings:

[0018] The present invention is applicable to the case where the evaporation gas pressure inside the operating low-temperature liquid storage tank is less than or equal to 8KPa.

[0019] The present invention provides a blind plate ball valve interchange device for perlite supplementary filling of a low-temperature storage tank. The blind plate ball valve interchange device for perlite supplementary filling of a low-temperature storage tank comprises an intake valve 1, a safety valve 2, a pressure gauge 3, an exhaust valve 4, a valve box 5, an observation hole 6, a glove hole a7, a glove hole b21, a bolt hole a8, a bolt hole b22, a positioning pin 9, a locking device 10, a valve bottom plate a11, a valve bottom plate b20, a sliding rod 12, a connecting plate 13 and a safety ball valve 14. The output end of the intake valve 1 is welded to the input end of the valve box 5, the safety valve 2 is welded to the input end of the valve box 5, the pressure gauge 3 is welded to the input end of the valve box 5, the exhaust valve 4 is welded to the input end of the valve box 5, the observation hole 6 is welded to the input end of the valve box 5, the glove hole a7 and the glove hole b21 are welded to the input end of the valve box 5, and the locking device 10 is connected to the valve bottom plate a11 and the valve bottom plate b20.

[0020] The locking device 10 is connected to the valve bottom plate a11 and the valve bottom plate b20 by threaded connection, and a sealing gasket is added at the connection.

[0021] The valve bottom plate a11 and the valve bottom plate b20 are located below the valve box 5 and are symmetrically distributed on both sides. The valve bottom plate a11 and the valve bottom plate b20 are positioned and bolted together through the positioning pin 9, the bolt hole a8 and the bolt hole b22, and all contact surfaces are sealed with sealing strips.

[0022] A sealing valve box 5 and valve bottom plate a11 and valve bottom plate b20 are used to form a pressure-resistant closed working space through a locking device 10. The perlite filling pipe port blind plate 15 and the safety ball valve 14 are interchangeable through the glove hole a7, glove hole b21 and the up and down sliding rod 12.

[0023] The operation of replacing the blind plate with a ball valve is as follows: clean the outer wall of the filling pipe 19, wrap the sealing strip, fix the valve bottom plate a11 and the valve bottom plate b20, seal the symmetrical valve bottom plate a11 and the valve bottom plate b20 with sealing strips, when the safety ball valve 14 is closed, fix the safety ball valve 14 to the connecting plate 13 with screws, glue the lower flange gasket 16 firmly, and thread the sliding rod 12 to the connecting plate 13 through the valve box body 5. Fix the pressure-resistant gloves on the glove holes a7 and the glove holes b21, place the explosion-proof tools on the valve bottom plate a11, cover the valve box body 5 on the valve bottom plate a11 and lock it with the locking device 10, open the exhaust Nitrogen is filled into valve 4 through the air inlet pipe, and the exhaust valve 4 is adjusted to stabilize the pressure in the valve box at 8KPa. The oxygen concentration in the exhaust hole is detected to be below 1%, and the pressure in the storage tank is confirmed. The exhaust valve 4 is adjusted to stabilize the pressure in the valve box to be greater than the pressure in the storage tank. The operator removes the blind plate 15 screws with pressure-resistant gloves, places the blind plate 15 on the valve bottom plate a11, cleans the end face of the filling port flange 18, connects the safety ball valve 14 to the filling port flange 18 through the sliding rod 12, tightens the screws, closes the intake valve 1, opens the locking device 10 after the pressure is lost, removes the valve box 5, and tightens the filling port screws again to ensure that the combustible gas does not leak, and completes the valve replacement work.

[0024] After completing the work of supplementing the perlite filling, it is necessary to replace the ball valve with a blind plate. The operation process is as follows: clean the outer wall of the perlite filling tube 19, install the valve bottom plate a11 and the valve bottom plate b20, realize positioning and bolt connection through the positioning pin 9, the bolt hole a8 and the bolt hole b22, install the valve box 5, realize threaded connection and locking through the locking device 10, and seal all contact surfaces with sealing strips. Clean the end face of the blind plate 15 and bond the sealing gasket through the glove hole a7 and the glove hole b21, inject inert gas nitrogen into the sealing valve box through the intake valve 1, stabilize the pressure in the sealing valve box 5 to the design value by adjusting the exhaust valve 4, loosen the fastening bolts of the safety ball valve 14, lift the safety ball valve 14 through the sliding rod 12, install the perlite filling pipe mouth blind plate 15, realize the bolt connection and tightening of the blind plate 15 and the filling pipe mouth through the glove hole a7 and the glove hole b21, and complete the replacement process of the safety ball valve 14 and the blind plate 15.

[0025] It can be seen from the technical solutions provided by the present invention that the present invention has the following technical effects: the present invention has a simple structure and is easy to operate.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A blind plate ball valve interchangeable device for perlite supplementary filling pipe openings of a low-temperature storage tank, which is arranged at the pipe opening of a filling pipe, and is characterized in that: the blind plate ball valve interchangeable device for perlite supplementary filling pipe openings of a low-temperature storage tank comprises an intake valve (1), a safety valve (2), a pressure gauge (3), an exhaust valve (4), a valve box (5), an observation hole (6), a glove hole a (7), a glove hole b (21), a bolt hole a (8), a bolt hole b (22), a positioning pin (9), a locking device (10), a valve bottom plate a (11), a valve bottom plate b (20), a sliding rod (12), a connecting plate (13) and a safety ball valve (14); the output end of the intake valve (1) is welded to the input end of the valve box (5), the safety valve (2) is welded to the input end of the valve box (5), the pressure gauge (3) is welded to the valve box The valve body (5) is welded to the input end of the valve box body (5), the exhaust valve (4) is welded to the input end of the valve box body (5), the observation hole (6) is welded to the input end of the valve box body (5), the glove hole a (7) and the glove hole b (21) are welded to the input end of the valve box body (5), the locking device (10) is connected to the valve bottom plate a (11) and the valve bottom plate b (20), the valve bottom plate a (11) and the valve bottom plate b (20) are arranged at the pipe mouth of the filling pipe, the valve bottom plate a (11) and the valve bottom plate b (20) are located below the valve box body (5) and are symmetrically distributed on both sides, the valve bottom plate a (11) and the valve bottom plate b (20) are positioned and bolted by a positioning pin (9), a bolt hole a (8) and a bolt hole b (22), and all contact surfaces are sealed with a sealing strip, wherein, When replacing the blind plate with a ball valve, fix the valve bottom plate a (11) and the valve bottom plate b (20), keep the safety ball valve (14) in the closed state, fix the safety ball valve (14) to the connecting plate (13), connect the sliding rod (12) to the connecting plate (13) through the valve box (5), fix the pressure-resistant gloves to the glove holes a (7) and the glove holes b (21), cover the valve box (5) on the valve bottom plate a (11) and lock it with the locking device (10), open the exhaust valve (4 ) Fill nitrogen from the air inlet pipe, detect the oxygen concentration at the exhaust hole and confirm the pressure in the tank, adjust the exhaust valve (4) to stabilize the pressure in the valve box to be greater than the pressure in the tank, remove the blind plate with pressure-resistant gloves and place the blind plate on the valve bottom plate a (11), connect the safety ball valve (14) to the filling port flange through the sliding rod (12) and tighten it, close the air inlet valve (1), open the locking device (10) when the pressure is lost, remove the valve box (5), tighten the filling port again, and complete the valve replacement work.

2. The device for exchanging ball valves for supplementing the pipe opening with perlite for filling the low-temperature storage tank according to claim 1 is characterized by: The locking device (10) is connected to the valve bottom plate a (11) and the valve bottom plate b (20) by threaded connection, and a sealing gasket is added at the connection.

3. The low-temperature storage tank perlite supplementary filling pipe port blind plate ball valve interchangeable device according to claim 1 is characterized by: A sealing valve box (5) and a valve bottom plate a (11) and a valve bottom plate b (20) are used to form a pressure-resistant closed working space through a locking device (10), and the pearlite filling pipe port blind plate (15) and the safety ball valve (14) are interchangeable through the glove hole a (7), the glove hole b (21) and the up-and-down sliding rod (12).

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