Water cutting device of spherical storage tank

Abstract

The utility model relates to the technical field of water cutting of spherical tanks, and discloses a water cutting device of a spherical storage tank, which comprises a water cutting device body, an ultrasonic probe assembly used for detecting the liquid level in the water cutting device body is arranged on the outer wall of the water cutting device body, the water cutting device body is communicated with a feed valve and a sewage flash evaporation assembly, and the sewage flash evaporation assembly is communicated with the feed valve. And a first drainage valve is communicated between the water cutting device body and the sewage flash evaporation assembly. The ultrasonic probe assembly is arranged, when the high liquid level set on the water cutting device body detects that the medium in the water cutting device body is water, the feeding valve is automatically closed, after preset sedimentation is achieved, it is confirmed that the feeding valve is closed, and the system automatically opens the first drainage valve; when the low liquid level group detects that the medium in the tank is non-water or other interlocking valve closing signals, the first drainage valve is closed immediately, and during working, only one of the feeding valve and the first drainage valve is in an open state, so that isolated water cutting is realized, and water cutting safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of water drainage of spherical tanks, in particular to a water drainage device for spherical storage tanks. Background Technique

[0002] Spherical storage tanks are commonly used to store liquefied gases or liquids in industrial fields such as petrochemical industry. Water and other impurities that require drainage often accumulate at the bottom of the storage tank. It is necessary to carry out water drainage operations through a water drainer before entering the chemical device, otherwise various accidents will occur.

[0003] Petrochemical industry usually involves flammable substances, and extra care is needed during operation. The existing water drainage system for spherical storage tanks has problems of insufficient safety. Therefore, there is an urgent need for a safer and more convenient water drainage system. To solve the above problems, we propose a water drainage device for spherical storage tanks. Content of the Utility Model

[0004] The purpose of the utility model is to provide a water drainage system for spherical storage tanks with high safety to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A water drainage device for spherical storage tanks includes a water drainer body connected to the drainage end of the spherical storage tank. An ultrasonic probe assembly for detecting the liquid level in the water drainer body is arranged on the outer wall of the water drainer body. The water inlet end of the water drainer body is connected to a feed valve electrically connected to the ultrasonic probe assembly. The water outlet end of the water drainer body is connected to a sewage flash evaporation assembly. A first drainage valve electrically connected to the ultrasonic probe assembly is connected between the water drainer body and the sewage flash evaporation assembly. During operation, only one of the feed valve and the first drainage valve is in the open state.

[0006] According to the above technical solution, one end of the feed valve away from the water drainer body is connected to a solid-liquid separation pipe.

[0007] According to the above technical solution, the sewage flash evaporation assembly includes a closed transportation tank, and an exhaust valve connected to an external flare gas pipeline is arranged at the top of the closed transportation tank.

[0008] According to the above technical solution, the top of the closed transportation tank is connected to a nitrogen introduction valve connected to an external nitrogen source.

[0009] According to the above technical solution, the liquid inlet end of the closed transportation tank is connected to the first drainage valve, and the drainage end of the sewage flash evaporation assembly is connected to a second drainage valve, and the second drainage valve is electrically connected to the first drainage valve.

[0010] According to the above technical solution, the sewage flash evaporation assembly includes a nitrogen introduction valve, and the feed valve, the first drainage valve, the second drainage valve, and the nitrogen introduction valve are all pneumatic valves.

[0011] According to the above technical solution, the ultrasonic probe assembly includes a high liquid level group, a low liquid level group, and an alarm liquid level group. The high liquid level group is electrically connected to the first drain valve, and the low liquid level group is electrically connected to the feed valve.

[0012] According to the above technical solution, each of the high liquid level group, the low liquid level group, and the alarm liquid level group includes three ultrasonic sensors.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] In the present utility model, an ultrasonic probe assembly for detecting the liquid level inside is provided on the outer wall of the water separator body. When the high liquid level group on the water separator body detects that the medium inside is water, the feed valve automatically closes. After reaching the preset sedimentation time, it is confirmed that the feed valve is closed, and the system automatically opens the first drain valve. When draining water, when the low liquid level group detects that the medium in the tank is non-water or other interlocking valve closing signals, the first drain valve immediately closes. During operation, only one of the feed valve and the first drain valve is in the open state, realizing isolated water drainage, that is, at most only one valve is open at any time, reducing the accident risk and improving the safety of the equipment. During the waiting period for water drainage, the feed valve is in the open state, and the first drain valve is closed to ensure the safety of water drainage.

[0015] In the present utility model, a closed transport tank with normal pressure inside is provided downstream of the water separator body. Under the pressure change, the alkane gas compressed in the water will be separated from water and steam in the closed transport tank. The alkane gas is discharged from the exhaust valve above the closed transport tank to the flare gas pipeline system for treatment, further improving the safety of the equipment, and at the same time preventing the precipitated alkane gas from being discharged together with the water, forming a safety hazard.

[0016] In the present utility model, a solid-liquid separation pipe is provided, which can separate the solid impurities in the spherical storage tank (the sewage that has not entered the water separator body) from the water, preventing the solid impurities from flowing to the downstream equipment and causing blockage of the downstream pipeline, and reducing the working burden of the subsequent equipment. Description of the Drawings

[0017] Figure 1 is the overall connection schematic diagram of the water separation system of the present utility model;

[0018] Figure 2 is the schematic diagram of the sewage flash evaporation assembly of the present utility model.

[0019] In the figure:

[0020] 1. Water separator body; 2. Ultrasonic probe assembly; 21. High liquid level group; 22. Low liquid level group; 23. Alarm liquid level group; 3. Feed valve; 4. Sewage flashing assembly; 41. Sealed transport tank; 42. Exhaust valve; 43. Nitrogen introduction valve; 5. First drain valve; 6. Solid-liquid separation pipe; 7. Second drain valve. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figure 1-2 , the present invention provides a water separation device technical solution for a spherical storage tank: including a water separator body 1 connected to the drainage end of the spherical storage tank. The water separator body 1 is usually installed at the lower part of the spherical storage tank for removing the accumulated water in the spherical storage tank. An ultrasonic probe assembly 2 for detecting the liquid level inside it is provided on the outer wall of the water separator body 1. The ultrasonic probe assembly 2 is installed outside the tank body and does not contact the medium, ensuring that the probe assembly is not contaminated or damaged.

[0023] The inlet end of the water separator body 1 is connected to a feed valve 3 electrically connected to the ultrasonic probe assembly 2. According to the detection of the liquid level by the ultrasonic probe assembly 2, the feed valve 3 is opened and closed, thereby controlling the outflow of the accumulated water in the spherical storage tank.

[0024] The outlet end of the water separator body 1 is connected to a sewage flashing assembly 4. The sewage discharged from the water separator body 1 contains flammable and explosive volatile substances. These substances are easy to volatilize under normal temperature and pressure to form combustible gases, which may cause an explosion once encountering a fire source or high temperature. By setting the sewage flashing assembly 4, these volatile substances can be quickly separated and safely disposed of in the subsequent treatment process, thereby reducing the risk of explosion. At the same time, the set sewage flashing assembly 4 can also reduce the corrosion and wear of the sewage on the equipment and extend the service life of the equipment.

[0025] A first drain valve 5, which is also electrically connected to the ultrasonic probe assembly 2, is further provided between the two for controlling the on-off of the flow between the water separator body 1 and the sewage flashing assembly 4. When the water separator is working, only one of the feed valve 3 and the first drain valve 5 is in the open state to achieve isolated water separation, that is, at most only one valve is open at any time, reducing the accident risk and improving the safety of the equipment. During the waiting period for water separation, the feed valve 3 is in the open state, and the first drain valve 5 is closed to ensure water separation safety.

[0026] Specifically, one end of the feed valve 3 away from the water separator body 1 is connected to a solid-liquid separation pipe 6. The solid-liquid separation pipe 6 is located at the drainage end of the spherical storage tank, and can separate solid impurities from water in the spherical storage tank (sewage that has not yet entered the water separator body 1), preventing solid impurities from flowing to downstream equipment, causing blockage of downstream pipelines, and reducing the working burden of subsequent equipment.

[0027] Specifically, the sewage flashing assembly 4 includes a closed transportation tank 41. The closed transportation tank 41 is a closed tank with normal pressure inside. The alkane gases compressed in water will undergo steam-water separation in the closed transportation tank 41 due to pressure changes. An exhaust valve 42 connected to the external flare gas pipeline is provided at the top of the closed transportation tank 41. The alkane gases are discharged from the exhaust valve 42 above the closed transportation tank 41 to the flare gas pipeline system for treatment, further improving the safety of the equipment. At the same time, it can also prevent the precipitated alkane gases from being discharged together with water, forming a safety hazard.

[0028] At the same time, a nitrogen introduction valve 43 connected to an external nitrogen source is also connected to the top of the closed transportation tank 41. If the sewage in the closed transportation tank 41 does not flow smoothly, nitrogen can be introduced through the nitrogen introduction valve 43 to apply auxiliary pressure to the sewage in the closed transportation tank 41 to achieve steam-water separation.

[0029] Specifically, the drainage end of the closed transportation tank 41 is connected to a second drainage valve 7. The second drainage valve 7 is electrically connected to the first drainage valve 5 and works together to achieve orderly drainage. When the closed transportation tank 41 drains water, the second drainage valve 7 opens while the first drainage valve 5 closes, further improving the safety of the equipment.

[0030] In the entire system, the nitrogen introduction valve 43 included in the sewage flashing assembly 4, as well as the feed valve 3, the first drainage valve 5, and the second drainage valve 7, all adopt pneumatic valves, which have the advantages of rapid response and precise control. At the same time, when there is no power supply on-site, the operator only needs to turn on the air source, and the water separator can achieve automatic water drainage and automatically close the valve after draining.

[0031] Specifically, the ultrasonic probe assembly 2 includes a high liquid level group 21, a low liquid level group 22, and an alarm liquid level group 23. The high liquid level group 21 is electrically connected to the first drainage valve 5, and the low liquid level group 22 is electrically connected to the feed valve 3. When the high liquid level group 21 on the water separator body 1 detects that the medium inside is water, the feed valve 3 automatically closes. After reaching the preset sedimentation time, it is confirmed that the feed valve 3 is closed. The system automatically opens the first drainage valve 5 to achieve isolated water drainage, and the pressure required for water drainage is provided by the saturated vapor pressure (or compressed gas) of the medium.

[0032] During drainage, when the low liquid level group 22 detects that the medium in the tank is non-water or other interlocking valve closing signals, such as: drainage timeout, pressure below the lower limit, valve system failure, process interlock, manual jog stop. The first drain valve 5 closes immediately.

[0033] In the automatic mode, the water drainage can be manually started or stopped. When the system confirms that the first drain valve 5 is closed and there are no other interlocking alarm signals, the feed valve 3 is opened to enter the next drainage cycle.

[0034] The alarm liquid level group 23 is used to give an alarm when the liquid level is abnormal.

[0035] Specifically, the high liquid level group 21, the low liquid level group 22, and the alarm liquid level group 23 are all composed of three ultrasonic sensors. The opening or closing of the feed valve 3 and the first drain valve 5 is controlled in the "two out of three" manner of the detection signals of the ultrasonic sensors (for each liquid level, there are 3 sensors, and when 2 out of the 3 sensors obtain signals, the liquid level height can be confirmed), ensuring accurate liquid level identification.

[0036] Working principle:

[0037] When the high liquid level group 21 on the water separator body 1 detects that the medium inside is water, the feed valve 3 automatically closes. After reaching the preset sedimentation time, when it is confirmed that the feed valve 3 is closed, the system automatically opens the first drain valve 5 to achieve isolated water drainage.

[0038] During drainage, when the low liquid level group 22 detects that the medium in the tank is non-water or other interlocking valve closing signals, such as: drainage timeout, pressure below the lower limit, valve system failure, process interlock, manual jog stop. The first drain valve 5 closes immediately.

[0039] In the automatic mode, the water drainage can be manually started or stopped. When the system confirms that the first drain valve 5 is closed and there are no other interlocking alarm signals, the feed valve 3 is opened to enter the next drainage cycle.

[0040] When the water separator is working, only one of the feed valve 3 and the first drain valve 5 is in the open state to achieve isolated water drainage, that is, at most only one valve is open at any time, reducing the accident risk and improving the safety of the equipment. During the waiting period for water drainage, the feed valve 3 is in the open state, and the first drain valve 5 is closed to ensure the safety of water drainage.

[0041] The set solid-liquid separation pipe 6 is located at the drainage end of the spherical storage tank, which can separate the solid impurities from the water in the spherical storage tank (the sewage that has not entered the water separator body 1), prevent the solid impurities from flowing to the downstream equipment, causing blockage of the downstream pipeline, and reducing the working burden of the subsequent equipment.

[0042] Downstream of the water separation tank, a closed transfer tank 41 with normal internal pressure is provided. For the alkane gas compressed in water, due to the pressure change, steam-water separation will occur in the closed transfer tank 41. The alkane gas is discharged from the exhaust valve 42 above the closed transfer tank 41 to the flare gas pipeline system for treatment, which further improves the safety of the equipment. At the same time, it can also prevent the precipitated alkane gas from being discharged together with water, thus eliminating potential safety hazards.

[0043] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. These terms are only used for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the present invention.

[0044] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0045] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A water drainage device for a spherical storage tank, comprising a water drainage device body (1) communicated with the drainage end of the spherical storage tank, characterized in that: An ultrasonic probe assembly (2) for detecting the liquid level inside the water separator body (1) is provided on the outer wall of the water separator body (1). A feed valve (3) electrically connected to the ultrasonic probe assembly (2) is connected to the water inlet end of the water separator body (1). A sewage flashing assembly (4) is connected to the water outlet end of the water separator body (1). A first drain valve (5) electrically connected to the ultrasonic probe assembly (2) is connected between the water separator body (1) and the sewage flashing assembly (4). During operation, only one of the feed valve (3) and the first drain valve (5) is in the open state.

2. The water drainage device for a spherical storage tank according to claim 1, characterized in that: One end of the feed valve (3) away from the water separator body (1) is connected to a solid-liquid separation pipe (6).

3. The water drainage device for a spherical storage tank according to claim 1, wherein: The sewage flashing assembly (4) includes a closed transport tank (41). An exhaust valve (42) connected to an external flare gas pipeline is provided at the top of the closed transport tank (41).

4. The water drainage device for a spherical storage tank according to claim 3, characterized in that: The top of the closed transport tank (41) is connected to a nitrogen introduction valve (43) connected to an external nitrogen source.

5. The water drainage device for a spherical storage tank according to claim 3, wherein: The liquid inlet end of the closed transport tank (41) is connected to the first drain valve (5). The drain end of the closed transport tank (41) is connected to a second drain valve (7). The second drain valve (7) is electrically connected to the first drain valve (5).

6. The water drainage device for a spherical storage tank according to claim 5, characterized in that: The sewage flashing assembly (4) includes a nitrogen introduction valve (43). The feed valve (3), the first drain valve (5), the second drain valve (7), and the nitrogen introduction valve (43) are all pneumatic valves.

7. The water drainage device for a spherical storage tank according to claim 1, characterized in that: The ultrasonic probe assembly (2) includes a high liquid level group (21), a low liquid level group (22), and an alarm liquid level group (23). The high liquid level group (21) is electrically connected to the first drain valve (5). The low liquid level group (22) is electrically connected to the feed valve (3).

8. The water drainage device for a spherical storage tank according to claim 7, characterized in that: The high liquid level group (21), the low liquid level group (22), and the alarm liquid level group (23) are each composed of three ultrasonic sensors.

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