Heat tracing temperature adjusting system for automatic water cutting device of liquefied gas storage tank

Abstract

The utility model discloses a heat tracing temperature adjusting system for an automatic water cutting device of a liquefied gas storage tank, which comprises a liquefied gas spherical tank and the automatic water cutting device, the liquefied gas spherical tank is connected with the automatic water cutting device through a water discharging pipe, a remote control valve and a water cutting valve are arranged on the water discharging pipe, a tank root valve is arranged at the position close to the liquefied gas spherical tank, and the tank root valve is connected with the automatic water cutting device. A thermometer is arranged on the upper portion of the automatic water cutting device, a hot water supply pipe and a hot water return pipe are arranged on the outer side face of the lower portion of the automatic water cutting device respectively, and a hot water supply tank root valve and a hot water return tank root valve are arranged on the hot water supply pipe and the hot water return pipe close to the automatic water cutting device respectively. According to the heat tracing temperature adjusting system for the automatic water cutting device of the liquefied gas storage tank, the heat tracing temperature of the automatic water cutting device can be controlled, frequent opening of a safety valve is avoided, and the workload of workers is relieved.

Description

Technical Field

[0001] The utility model relates to the technical field of petrochemical production, in particular to a heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank. Background Art

[0002] Liquefied gas is the abbreviation of liquefied petroleum gas, which is mainly composed of propane, n-butane, isobutane and a small amount of ethane, organic compounds greater than carbon 5, unsaturated hydrocarbons, etc. Some liquefied gases also contain propylene and butene. Liquefied gas has the characteristics of flammability and explosiveness, gasification, thermal expansion, and electrical properties. When the liquefied gas is at 15°C, the vapor pressure is greater than 0.1MPa. From the perspective of fire hazard, it is classified as Class A liquid and belongs to the category of liquefied hydrocarbons. According to industry safety management standards, liquefied hydrocarbon storage tanks with water cutting needs should use automatic water cutters.

[0003] At present, there is no effective heating temperature regulation control system for the automatic water cut-off device of domestic liquefied gas storage tanks. Since the density of liquefied gas is greatly affected by temperature, the density decreases as the temperature rises and the volume expands. When the heating temperature of the automatic water cut-off device is too high, the safety valve on the top of the water cut-off device will open. Especially in hot weather, the safety valve will open frequently due to the excessively high temperature of the automatic water cut-off device, which increases the workload of workers. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the existing defects and provide a heating temperature adjustment system for an automatic water cutter of a liquefied gas storage tank, which can control the heating temperature of the automatic water cutter, avoid frequent opening of the safety valve, reduce the workload of workers, further improve the use efficiency of the radiator, and effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank, comprising a liquefied gas ball tank and an automatic water cutter, wherein the liquefied gas ball tank and the automatic water cutter are connected via a drain pipe, a remote control valve and a water cut-off valve are arranged on the drain pipe, a tank root valve is arranged near the liquefied gas ball tank, a thermometer is arranged on the upper part of the automatic water cutter, a hot water supply pipe and a hot water return pipe are arranged on the lower outer side of the automatic water cutter, a hot water supply tank root valve and a hot water return tank root valve are arranged on the hot water supply pipe and the hot water return pipe near the automatic water cutter, the hot water supply pipe is connected to an external hot water supply main network, a hot water supply operating valve and a regulating valve are arranged on the hot water supply pipe, the regulating valve is connected to a valve positioner, an input end of the valve positioner is electrically connected to an output end of the thermometer, the hot water return pipe is connected to an external hot water return main network, and a hot water return operating valve is arranged on the hot water return pipe.

[0006] As a preferred technical solution of the utility model, a regulating valve rear cut-off valve and a regulating valve front cut-off valve are respectively provided at both ends of the regulating valve, the regulating valve front cut-off valve is connected to the hot water supply pipe through a regulating valve branch pipe, a regulating valve bypass pipe is provided between the hot water supply pipe and the water outlet end of the regulating valve rear cut-off valve, and a regulating valve bypass valve is provided on the regulating valve bypass pipe.

[0007] As a preferred technical solution of the utility model, the bottom of the automatic water cutter is connected to the sewage collection tank through a water cutter sewage pipe.

[0008] As a preferred technical solution of the utility model, a water cutter sewage discharge pipe is respectively provided with a water cutter sewage discharge primary valve and a water cutter sewage discharge secondary valve.

[0009] As an optimal technical solution of the utility model, the upper part of the automatic water cutter is connected to the vent main pipe, one path of the vent main pipe is connected to the safety valve branch pipe, and the other path is connected to the vent branch pipe, the safety valve branch pipe is respectively provided with a safety valve inlet valve, a safety valve and a safety valve outlet valve, the vent branch pipe is provided with a vent branch valve, and the safety valve branch pipe and the vent branch pipe are both connected to the flare system main pipe.

[0010] Compared with the prior art, the beneficial effects of the utility model are as follows: the heating temperature regulating system for the automatic water cutter of the liquefied gas storage tank is reasonably designed and easy to operate. By setting a temperature gauge on the automatic water cutter, the opening of the regulating valve on the hot water supply pipe is controlled according to the temperature of the upper temperature gauge of the automatic water cutter and the set temperature difference value, thereby realizing the control of the water inlet of the heating water supply. The temperature of the automatic water cutter is stabilized at a fixed value through the control and regulation of the regulating valve, thereby reducing the frequent opening of the safety valve of the automatic water cutter caused by excessive temperature, reducing the number of times workers frequently visit the site to check, and reducing the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the utility model system.

[0012] In the figure: 1 drain pipe, 2 tank root valve, 3 remote control valve, 4 water cut-off valve, 5 vent main pipe, 6 safety valve branch pipe, 7 vent branch pipe, 8 safety valve inlet valve, 9 vent branch valve, 10 safety valve, 11 safety valve outlet valve, 12 flare system main pipe, 13 temperature gauge, 14 valve positioner, 15 hot water return pipe, 16 hot water return tank root valve, 17 regulating valve bypass pipe, 18 hot water supply pipe, 19 hot water supply tank root valve, 20 regulating valve bypass valve, 21 regulating valve rear cut-off valve, 22 regulating valve branch pipe, 23 regulating valve, 24 regulating valve front cut-off valve, 25 hot water supply operating valve, 26 hot water return operating valve, 27 water cutter drain pipe, 28 water cutter drain primary valve, 29 water cutter drain secondary valve, 30 automatic water cutter, 31 liquefied gas ball tank, 32 sewage collection tank. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments (for the convenience of description and understanding, the following is a schematic diagram of the present invention). Figure 1 Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0014] See also Figure 1 The utility model provides a technical solution: a heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank, comprising a liquefied gas ball tank 31 and an automatic water cutter 30, the liquefied gas ball tank 31 and the automatic water cutter 30 are connected by a drain pipe 1, a remote control valve 3 and a water cut valve 4 are arranged on the drain pipe 1, a tank root valve 2 is arranged near the liquefied gas ball tank 31, a temperature gauge 13 is arranged on the upper part of the automatic water cutter 30, a hot water supply pipe 18 and a hot water return pipe 15 are arranged on the outer side of the lower part of the automatic water cutter 30, and a hot water return pipe 15 is arranged near the automatic water cutter 30. The hot water supply pipe 18 and the hot water return pipe 15 of the water cutter 30 are respectively provided with a hot water supply tank root valve 19 and a hot water return tank root valve 16. The hot water supply pipe 18 is connected to the external hot water supply main network. The hot water supply pipe 18 is respectively provided with a hot water supply operating valve 25 and a regulating valve 23. The regulating valve 23 is connected to the valve positioner 14. The input end of the valve positioner 14 is electrically connected to the output end of the thermometer 13. The hot water return pipe 15 is connected to the external hot water return main network. The hot water return pipe 15 is provided with a hot water return operating valve 26.

[0015] Furthermore, a regulating valve rear shut-off valve 21 and a regulating valve front shut-off valve 24 are respectively provided at both ends of the regulating valve 23. The regulating valve front shut-off valve 24 is connected to the hot water supply pipe 18 through a regulating valve branch pipe 22. A regulating valve bypass pipe 17 is provided between the hot water supply pipe 18 and the water outlet end of the regulating valve rear shut-off valve 21. A regulating valve bypass valve 20 is provided on the regulating valve bypass pipe 17. By providing the regulating valve bypass pipe 17, the regulating valve bypass valve 20 can be opened when the water intake is increased, so that the automatic water cut-off device can heat up quickly, which is suitable for cold weather in winter.

[0016] Furthermore, the bottom of the automatic water cutter 30 is connected to the sewage collection tank 32 through the water cutter sewage pipe 27, and the water cutter sewage pipe 27 is respectively provided with a water cutter sewage primary valve 28 and a water cutter sewage secondary valve 29. The sewage generated during the water cutting process is collected through the sewage collection tank 32.

[0017] Furthermore, in order to ensure the stability of the internal pressure of the automatic water cut-off device 30, the upper part of the automatic water cut-off device 30 is connected to the vent main pipe 5, one path of the vent main pipe 5 is connected to the safety valve branch pipe 6, and the other path is connected to the vent branch pipe 7. The safety valve branch pipe 6 is respectively provided with a safety valve inlet valve 8, a safety valve 10 and a safety valve outlet valve 11, and the vent branch pipe 7 is provided with a vent branch valve 9. The safety valve branch pipe 6 and the vent branch pipe 7 are both connected to the flare system main pipe 12.

[0018] When the ambient temperature is relatively high, such as in summer, the liquefied gas ball tank 31 does not need to open the heating system of the water cutter when cutting water through the automatic water cutter 30. All valves for hot water supply and hot water return can be closed. Only the tank root valve 2, the remote control valve 3 and the water cut-off valve 4 on the water pipe 1 need to be opened to start the automatic water cutting operation. The sewage after the automatic water cutter 30 enters the sewage collection tank 32 through the water cutter sewage discharge primary valve 28, the water cutter sewage discharge secondary valve 29 and the water cutter sewage discharge pipe 27 of the automatic water cutter 30 for further treatment.

[0019] When the ambient temperature is relatively low in winter, the liquefied gas ball tank 31 needs to start the heating system of the water cutter 30 when cutting off the water through the automatic water cutter 30. When cutting off the water, it is necessary to open all the valves of the hot water supply and hot water return, and at the same time open the tank root valve 2, the remote control valve 3 and the water cut valve 4 on the water pipe 1 to start the automatic water cut operation;

[0020] During the operation of the automatic water cut-off device 30, the heating temperature of the automatic water cut-off device 30 is generally set to 20°C. When the temperature of the thermometer on the upper part of the automatic water cut-off device 30 exceeds 20°C, the regulating valve 23 provided on the hot water supply pipe 18 will adjust the valve opening to reduce the amount of hot water supply; when the temperature is lower than 20°C, the regulating valve 23 will adjust the valve opening to increase the amount of hot water supply. The temperature of the automatic water cut-off device 30 is stabilized at 20°C through the control and regulation of the regulating valve 23; the heated return water is returned to the hot water return main network through the return water system.

[0021] A safety venting system is arranged on the upper part of the automatic water cut-off device 30. In normal state, the safety valve inlet valve 8 and the safety valve outlet valve 11 are normally open, and the venting branch valve 9 is closed. When the internal pressure of the automatic water cut-off device 30 exceeds the set pressure of the safety valve 10, the safety valve 10 opens, and the vented gas enters the flare venting system. The safety valve 10 is lead-sealed and a safety valve bypass line is arranged.

[0022] Under normal conditions, the remote control valve 3 is opened when the liquefied gas water is cut off. In the event of an accident, the drain pipe 1 can be remotely operated to close the valve to stop the liquefied gas water cut-off operation. The operator does not need to manually close the valve at the automatic water cut-off device 30, thereby protecting the operator's safety.

[0023] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank, comprising a liquefied gas ball tank (31) and an automatic water cutter (30), wherein the liquefied gas ball tank (31) and the automatic water cutter (30) are connected via a drain pipe (1), wherein a remote control valve (3) and a water cut valve (4) are arranged on the drain pipe (1), and a tank root valve (2) is arranged near the liquefied gas ball tank (31), wherein: A thermometer (13) is provided on the upper part of the automatic water cut-off device (30), and a hot water supply pipe (18) and a hot water return pipe (15) are provided on the outer side surface of the lower part of the automatic water cut-off device (30). A hot water supply tank root valve (19) and a hot water return tank root valve (16) are provided on the hot water supply pipe (18) and the hot water return pipe (15) near the automatic water cut-off device (30), respectively. The hot water supply pipe (18) is connected to an external hot water supply main pipe network, and a hot water supply operating valve (25) and a regulating valve (23) are provided on the hot water supply pipe (18), respectively. The regulating valve (23) is connected to a valve positioner (14), and the input end of the valve positioner (14) is electrically connected to the output end of the thermometer (13). The hot water return pipe (15) is connected to an external hot water return main pipe network, and a hot water return operating valve (26) is provided on the hot water return pipe (15).

2. A heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank according to claim 1, characterized in that: A regulating valve rear cut-off valve (21) and a regulating valve front cut-off valve (24) are respectively provided at both ends of the regulating valve (23); the regulating valve front cut-off valve (24) is connected to a hot water supply pipe (18) via a regulating valve branch pipe (22); a regulating valve bypass pipe (17) is provided between the hot water supply pipe (18) and the water outlet end of the regulating valve rear cut-off valve (21); and a regulating valve bypass valve (20) is provided on the regulating valve bypass pipe (17).

3. A heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank according to claim 1, characterized in that: The bottom of the automatic water cutter (30) is connected to the sewage collection tank (32) via the water cutter sewage pipe (27).

4. A heating temperature regulating system for an automatic water cutter of a liquefied gas storage tank according to claim 3, characterized in that: The water cutter sewage discharge pipe (27) is provided with a water cutter sewage discharge primary valve (28) and a water cutter sewage discharge secondary valve (29) respectively.

5. The heating temperature regulating system for the automatic water cutter of a liquefied gas storage tank according to claim 1 is characterized in that: The upper part of the automatic water cut-off device (30) is connected to the vent main pipe (5), one path of the vent main pipe (5) is connected to the safety valve branch pipe (6), and the other path is connected to the vent branch pipe (7), the safety valve branch pipe (6) is respectively provided with a safety valve inlet valve (8), a safety valve (10) and a safety valve outlet valve (11), the vent branch pipe (7) is provided with a vent branch valve (9), and the safety valve branch pipe (6) and the vent branch pipe (7) are both connected to the flare system main pipe (12).

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