Liquefied gas dehydration flash tank

Abstract

The utility model belongs to the field of automatic dehydration of liquefied gas tanks, and particularly relates to a liquefied gas dehydration flash tank, which comprises a liquid hydrocarbon water cutting device and a flash tank connected with the liquid hydrocarbon water cutting device through a dehydration pipeline, an automatic dehydration valve is arranged on the dehydration pipeline, a heater and a thermometer are arranged in the flash tank, and the liquid hydrocarbon water cutting device is connected with the flash tank. The flash tank is respectively connected with an emptying pipeline, a drainage line, a hot water inlet pipeline and a hot water return pipeline, valves are arranged on the emptying pipeline, the drainage line, the hot water inlet pipeline and the hot water return pipeline, an unsteady detonation-resistant flame arrester is arranged on the emptying pipeline, and the emptying pipeline is connected with a flare gas emptying system; according to the utility model, hydrocarbon components in hydrocarbon-containing sewage are gasified and enter a flare gas emptying system through the emptying pipeline and the unsteady detonation-resistant flame arrester, so that the gas is prevented from escaping to cause poisoning to operators and cause fire disasters or explosions to a working environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic dehydration of liquefied gas tanks, in particular to a liquefied gas dehydration flash tank. Background Art

[0002] Liquid hydrocarbon is one of the important materials for processing and storage in petrochemical enterprises. The proportion of fire and explosion accidents caused by the leakage of liquid hydrocarbon accounts for a large proportion. Improving the safety of liquid hydrocarbon spherical storage tanks and avoiding or reducing the occurrence of accidents are the top priorities in actual production. The "Petrochemical Enterprise Fire Prevention Standard" requires that liquid hydrocarbon storage tanks be equipped with secondary dehydration facilities, and liquid hydrocarbon storage tanks are equipped with automatic water cut-off devices. However, during the water cut-off process, toxic and harmful gases in the sewage can easily escape and cause poisoning of operators. At the same time, the escaped gas can also cause fire or explosion in the working environment. Utility Model Content

[0003] The utility model aims to provide a liquefied gas dehydration flash tank to solve the problems raised in the above background technology.

[0004] The purpose of this utility model is to adopt the following technical solutions to achieve:

[0005] A liquefied gas dehydration flash tank according to the utility model comprises a liquid hydrocarbon water cutter and a flash tank connected to the liquid hydrocarbon water cutter via a dehydration pipeline, wherein the dehydration pipeline is provided with an automatic dehydration valve;

[0006] The flash tank is provided with a heater and a thermometer, and the flash tank is respectively connected with a vent line, a drain line, a hot water inlet line, and a hot water return line. Valves are provided on the vent line, the drain line, the hot water inlet line, and the hot water return line. A non-steady-state detonation arrester is provided on the vent line, and the vent line is connected to the flare gas venting system.

[0007] By means of the above technical solution, the utility model has the following advantages:

[0008] The utility model gasifies hydrocarbon components in hydrocarbon-containing sewage and enters the flare gas venting system through a venting pipeline and a non-steady-state detonation and flame arrester, thereby preventing gas escape from poisoning operators and causing fire or explosion to the working environment.

[0009] Furthermore, a Y-type filter is also provided on the dehydration pipeline.

[0010] Advantages: Y-type filters are used to remove impurities from hydrocarbon-containing wastewater in dehydration pipelines. By filtering out impurities in the fluid, impurities are prevented from damaging valves and equipment, which helps maintain the stability of the process.

[0011] Furthermore, a vent valve is provided on the vent pipeline, and the vent valve is a normally open valve.

[0012] Furthermore, a water inlet valve is provided on the hot water inlet pipeline, and the water inlet valve is electrically connected to the thermometer.

[0013] Advantages: When the temperature is lower or higher than the set temperature, the water inlet valve can open or close automatically.

[0014] Furthermore, the end of the drainage line is connected to the oily wastewater network of the entire plant.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of a liquefied gas dehydration flash tank.

[0017] [Reference Signs]

[0018] 1. Liquid hydrocarbon water cutter; 2. Automatic dehydration valve; 3. Dehydration pipeline; 4. Y-type filter; 5. Flash tank; 6. Vent pipeline; 7. Vent valve; 8. Drain line; 9. Drain valve; 10. Hot water inlet pipeline; 11. Inlet valve; 12. Hot water return pipeline; 13. Return valve; 14. Heater; 15. Non-steady-state detonation arrester; 16. Thermometer. DETAILED DESCRIPTION

[0019] The features and exemplary embodiments of various aspects of the utility model will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without the need for some of these specific details. The following description of the embodiment is only to provide a better understanding of the utility model by showing an example of the utility model. In the accompanying drawings and the following description, at least part of the known and prior art is not shown to avoid unnecessary ambiguity to the utility model; and, for clarity, the size and shape of the part may be exaggerated. The features or characteristics described below can be combined in one or more embodiments in any suitable manner. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity.

[0020] The utility model provides Figure 1A liquefied gas dehydration flash tank shown in the figure comprises a liquid hydrocarbon water cutter 1, a flash tank 5 connected to the liquid hydrocarbon water cutter 1 through a dehydration pipeline 3, an automatic dehydration valve 2 and a Y-type filter 4 are arranged in sequence on the dehydration pipeline 3 along the flow direction of the hydrocarbon-containing wastewater, and the Y-type filter 4 is used to remove impurities in the hydrocarbon-containing wastewater in the dehydration pipeline 3, and by filtering out impurities in the fluid, the impurities are prevented from damaging valves and equipment, which helps to maintain the stability of the process;

[0021] The flash tank 5 is provided with a heater 14 and a thermometer 16. The flash tank 5 is respectively connected with a vent line 6, a drain line 8, a hot water inlet line 10, and a hot water return line 12. The end of the drain line 8 is connected to the oily wastewater pipeline network of the whole plant. The vent line 6, the drain line 8, the hot water inlet line 10, and the hot water return line 12 are respectively provided with a vent valve 7, a drain valve 9, an inlet valve 11, and a return valve 13. The vent line 6 is provided with a non-steady-state detonation arrester 15, and the vent line 6 is connected to the flare gas venting system.

[0022] The hydrocarbon-containing wastewater in the liquid hydrocarbon cutter 1 enters the Y-type filter 4 through the dehydration pipeline 3. The Y-type filter 4 filters the solid impurities in the wastewater and then transports it to the flash tank 5. The flash tank 5 provides a heat source to the heater 14 through the hot water inlet pipeline 10, and the hot water return pipeline 12 recovers the heat source. The thermometer 16 is electrically connected to the hot water inlet valve 11. When the temperature reaches the set temperature, the inlet valve 11 is closed to reduce the heat source supply. When the temperature is lower than the set temperature, the inlet valve 11 is opened to increase the heat source supply. After the hydrocarbon-containing wastewater in the flash tank 5 is heated by the heater 14, the hydrocarbon components in the hydrocarbon-containing wastewater will be vaporized, and enter the flare gas venting system after passing through the venting pipeline 6 and the non-steady-state detonation and flame arrester 15. The wastewater after flashing enters the oil-containing wastewater pipeline network of the whole plant through the drainage line 8. The vent valve 7 is a normally open valve. The vent valve 7 needs to be closed when the flash tank 5 is inspected and repaired.

[0023] The above is only a preferred embodiment of the present invention. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, makes any simple modifications, equivalent changes and modifications to the above embodiments based on the technical essence of the present invention, which still fall within the scope of the technical solution of the present invention.

Claims

1. A liquefied gas dehydration flash tank, characterized in that: It comprises a liquid hydrocarbon water cutter (1), and a flash tank (5) connected to the liquid hydrocarbon water cutter (1) via a dehydration pipeline (3), wherein the dehydration pipeline (3) is provided with an automatic dehydration valve (2); The flash tank (5) is provided with a heater (14) and a thermometer (16). The flash tank (5) is respectively connected with a venting pipeline (6), a draining line (8), a hot water inlet pipeline (10), and a hot water return pipeline (12). Valves are provided on the venting pipeline (6), the draining line (8), the hot water inlet pipeline (10), and the hot water return pipeline (12). A non-steady-state detonation arrester (15) is provided on the venting pipeline (6). The venting pipeline (6) is connected with a flare gas venting system.

2. A liquefied gas dehydration flash tank according to claim 1, characterized in that: The dehydration pipeline (3) is also provided with a Y-type filter (4).

3. A liquefied gas dehydration flash tank according to claim 1, characterized in that: The vent pipeline (6) is provided with a vent valve (7), which is a normally open valve.

4. A liquefied gas dehydration flash tank according to claim 1, characterized in that: A water inlet valve (11) is provided on the hot water inlet pipeline (10), and the water inlet valve (11) is electrically connected to a thermometer (16).

5. The liquefied gas dehydration flash tank according to claim 1, characterized in that: The end of the drainage line (8) is connected to the oily wastewater pipe network of the entire plant.

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