Intelligent water cutting system of liquefied hydrocarbon spherical tank

Abstract

The utility model belongs to the technical field of automatic water cutting systems of storage tanks, in particular to an intelligent water cutting system of a liquefied hydrocarbon spherical tank, which comprises a spherical tank, a tank root valve, a desilting pipe and a water cutting tank, an inlet valve is arranged on a connecting pipeline of the desilting pipe and the water cutting tank, and a water cutting pipeline is arranged at a water outlet at the bottom of the water cutting tank. A floating ball valve device is arranged at a water outlet in the bottom of the water cutting tank, a water cutting valve is mounted on the water cutting pipeline, a level gauge extending into the water cutting tank is arranged at the top of the water cutting tank, a pressure balance pipeline is arranged between an opening in the side wall of the water cutting tank and the water cutting pipeline, and a balance valve is mounted on the pressure balance pipeline; the water draining device further comprises a water draining controller and a plurality of externally-attached liquid level switches installed on the outer side wall of the water draining tank. According to the intelligent water cutting system, the interface level meter is calibrated in real time through the externally-attached liquid level switch, water in the water cutting tank can be drained safely, conveniently and rapidly, the situation that the floating ball blocks the water outlet under high pressure is avoided, the situation that normal water cutting work is affected due to failure or damage of the interface level meter is avoided, the water drainage efficiency is high, and the water drainage effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic water cutting of liquefied hydrocarbon spherical tanks, and particularly relates to an intelligent water cutting system for liquefied hydrocarbon spherical tanks. Background Art

[0002] In the prior art, liquefied hydrocarbons are generally stored or transported in spherical tanks that can withstand high pressure. Due to the presence of water in the liquefied hydrocarbons stored in the spherical tanks, places where liquefied hydrocarbons are used mostly require liquefied hydrocarbons of higher purity to meet usage needs. At the same time, water deposited at the bottom of the spherical tanks that store liquefied hydrocarbons for a long time will also occupy the internal space of the spherical tanks, affecting the storage space of the liquefied hydrocarbons in the spherical tanks. In addition, the accumulated water can easily cause rust on the inner wall of the spherical tanks, which will also affect the service life of the spherical tanks and the quality of the liquefied hydrocarbons. Therefore, it is necessary to promptly cut off the water in the spherical tanks.

[0003] To this end, some people have also developed a water cutting tank connected to the bottom of the spherical tank for water cutting work, which can remove the accumulated water at the bottom of the spherical tank to obtain liquefied hydrocarbons with higher purity, so as to reduce the space occupied by the accumulated water and avoid the corrosion of the inner wall of the spherical tank by the accumulated water. The liquid level in the tank is detected by a liquid level detector installed on the water cutter, which can continuously detect the inside of the water cutting tank. When the liquid level reaches the height where water needs to be cut, the water cutter is started to cut water. However, the liquid level detector is easily damaged or fails after long-term use, which makes it easy for water to be cut by mistake, greatly affecting the safe use of the water cutter.

[0004] Therefore, it is urgent to develop an intelligent water cutting system and water cutting method for liquefied hydrocarbon spherical tanks that are convenient and fast to drain, have high drainage efficiency, and are safe and reliable. Utility Model Content

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and specifically discloses a water cut-off system for a liquefied hydrocarbon spherical tank. The water cut-off system calibrates the level gauge in real time through an externally attached liquid level switch to ensure accurate detection, and can more conveniently and quickly discharge the water in the water cut-off tank in a timely manner to avoid the float from clogging the water outlet under high pressure. The water drainage efficiency is high and the drainage effect is good.

[0006] In order to achieve the above technical objectives, the present invention is implemented according to the following technical solutions:

[0007] The utility model discloses an intelligent water cut-off system for a liquefied hydrocarbon spherical tank, comprising a spherical tank, wherein a tank root valve, a sand settling pipe, and a water cut-off tank are sequentially connected at the bottom of the spherical tank through pipelines. The end of the tank root valve extends into the sand settling pipe through a downpipe. An inlet valve is provided on the connecting pipeline between the sand settling pipe and the water cut-off tank. A water cut-off pipeline is provided at the water outlet at the bottom of the water cut-off tank. A float valve device is provided at the water outlet at the bottom of the water cut-off tank. The water cut-off pipeline is installed with a water cut-off valve. A contact level gauge extending into the water cut-off tank and capable of continuously detecting the hydrocarbon / water interface is provided at the top of the water cut-off tank. A pressure balancing pipeline is provided between the side wall opening of the water cut-off tank and the water cut-off pipeline, and a balancing valve is installed on the pressure balancing pipeline.

[0008] The invention also includes a water cut-off controller: the water cut-off controller is connected to the inlet valve, the interface level meter, the water cut-off valve, and the balancing valve through electrical signals, and controls the start and close of the inlet valve, the water cut-off valve, and the balancing valve in real time according to the reading of the interface height position of the liquefied hydrocarbon and water interface read by the interface level meter;

[0009] It also includes a plurality of external liquid level switches installed on the outer side wall of the water cutting tank from top to bottom and used for calibrating the boundary level meter.

[0010] As a further improvement of the above technology, the external liquid level switch is a non-contact ultrasonic liquid level sensor.

[0011] In the present invention, the external liquid level switch can be installed in the following ways:

[0012] First, there are three external liquid level switches, which are respectively located at the upper, middle and lower height positions of the side wall of the water cutting tank.

[0013] Second, there are two external liquid level switches, which are located at two different height positions, upper and lower, on the side wall of the water cut tank.

[0014] Third, there is one external liquid level switch, which is located at a height position in the middle of the side wall of the water cutting tank.

[0015] As a further improvement of the above technology, the float valve device includes a float valve body, a float, and a limit assembly. The outlet end of the float valve body is connected to the water cut pipeline. The float valve body and the limit assembly are both installed at the bottom position of the water cut tank. The float is placed in the area surrounded by the float valve body and the limit assembly. The density of the float is between the density of water and the density of liquefied hydrocarbons.

[0016] The utility model also discloses a water cutting method of the intelligent water cutting system of the liquefied hydrocarbon spherical tank, the specific steps of which are:

[0017] (1) First, the interface height position H0 of the liquefied hydrocarbon and water interface in the water cut tank where water cut is to be initiated is set in the water cut controller;

[0018] (2) Then, the interface height position of the liquefied hydrocarbon and water interface in the cut-off tank is measured by the interface level meter. When the position reaches H0, the cut-off controller receives the detected interface height data, and the cut-off controller sends a signal to close the cut-off valve and the inlet valve, start the balancing valve, and open the pressure balancing pipeline. The pressure above and below the float valve device in the cut-off tank reaches equilibrium, the float rises, and then the balancing valve is closed, and the cut-off valve is opened to open the cut-off pipeline for drainage;

[0019] (3) Then, when the water level drops to a low level, the float automatically blocks the water outlet of the float valve body after it falls, closing the water cut-off valve to stop drainage;

[0020] (4) Finally, when the interface meter fails due to long-term use or malfunctions and cannot accurately detect the height position of the interface between liquefied hydrocarbon and water in the cut-off tank, the three external liquid level switches will calibrate the accuracy of the measurement value of the interface meter, thereby calibrating whether the interface meter can be used normally. If the calibration result shows that the measurement value of the interface meter is inaccurate, the control system will automatically close the cut-off valve and alarm, waiting for the fault to be handled.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] (1) The intelligent water cut-off system of the liquefied hydrocarbon spherical tank described in the utility model is composed of a water cut-off controller, a water cut-off valve, several water level gauges, an inlet valve, and a balancing valve. When the interface water level in the water cut-off tank measured by the water level gauge reaches the point where drainage is required, the water cut-off controller opens the balancing valve, connects the pressure balancing pipeline, causes the float to float up, opens the water cut-off valve, and effectively drains the water from the water cut-off pipeline of the water cut-off tank, thus avoiding the problem of the float clogging the drain port when the pressure difference between the upper and lower parts of the water cut-off tank is large. This can timely and effectively solve the problem of the pressure difference between the upper and lower parts of the float valve device inside the water cut-off tank, and ensure the smooth drainage of the water cut-off tank.

[0023] (2) The intelligent water-cutting system for the liquefied hydrocarbon spherical tank described in the present invention is provided with a continuous liquid level meter capable of continuously measuring the liquid level inside the water-cutting tank, and a plurality of external liquid level switches installed at different heights on the side wall of the water-cutting tank to calibrate the detection value of the continuous liquid level meter in real time, thereby ensuring the accuracy of the height of the detection interface of the continuous liquid level meter, effectively preventing the occurrence of inaccurate detection events of the continuous liquid level meter after long-term use, improving the accuracy of water level detection, ensuring the smooth operation of the water-cutting system, and improving the water-cutting efficiency;

[0024] (3) The water cut-off system of the liquefied hydrocarbon spherical tank described in the utility model controls the opening and closing of each valve by a water cut-off controller to achieve accurate and timely water cut-off and drainage work, has a high degree of automation, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Figure 1 This is a structural diagram of the intelligent water cut-off system of the liquefied hydrocarbon spherical tank described in the utility model (undrained state);

[0027] Figure 2 This is a structural schematic diagram of the intelligent water cut-off system of the liquefied hydrocarbon spherical tank described in the utility model (drainage state). DETAILED DESCRIPTION

[0028] like Figure 1 、 Figure 2 As shown, the intelligent water cut-off system of a liquefied hydrocarbon spherical tank 1 described in the utility model comprises a spherical tank 1, wherein a tank root valve 2, a sand settling pipe 3, and a water cut-off tank 4 are sequentially connected at the bottom of the spherical tank 1 through pipelines, the end of the tank root valve 2 penetrates into the sand settling pipe 3 through a downpipe 5, an inlet valve 6 is provided on the connecting pipeline of the sand settling pipe 3 and the water cut-off tank 4, a water cut-off pipeline 10 is provided at the water outlet at the bottom of the water cut-off tank 4, a float valve device 7 is provided at the water outlet at the bottom of the water cut-off tank 4, a water cut-off valve 8 is installed on the water cut-off pipeline 10, a contact level gauge 9 that extends into the water cut-off tank 4 and can continuously measure the hydrocarbon / water interface is provided on the top of the water cut-off tank 4, a pressure balancing pipeline 20 is provided between the side wall of the water cut-off tank 4 and the water cut-off pipeline 10, and a balancing valve 11 is installed on the pressure balancing pipeline 20;

[0029] The system further includes a water cut controller 30: the water cut controller 30 is connected to the inlet valve 6, the interface level meter 9, the water cut valve 8, and the balancing valve 11 via electrical signals, and controls the start and stop of the inlet valve 6, the water cut valve 8, and the balancing valve 11 in real time according to the reading of the interface height position of the liquefied hydrocarbon-water interface read by the interface level meter 9;

[0030] It also includes a plurality of external liquid level switches 12 installed on the outer side wall of the water cutting tank 4 from top to bottom for calibrating the boundary level meter 9.

[0031] In the present invention, the external liquid level switch 12 is a non-contact ultrasonic liquid level sensor. Three external liquid level switches 12 are located at the top, middle, and bottom of the sidewall of the water cut tank 4. Alternatively, two external liquid level switches can be located at two different heights, the top and bottom, of the sidewall of the water cut tank; or one external liquid level switch can be located at the middle height of the sidewall of the water cut tank. Users can install the switches based on actual site needs.

[0032] The float valve device 7 includes a float valve body 71, a float 72, and a limit assembly 73. The outlet end of the float valve body 71 is connected to the water cut pipeline 10. The float valve body 71 and the limit assembly 73 are both installed at the bottom position of the water cut tank 4. The float 72 is placed in the area surrounded by the float valve body 71 and the limit assembly 73. The density of the float 72 is between the density of water and the density of liquefied hydrocarbons.

[0033] The utility model also discloses a water cutting method of the intelligent water cutting system of the liquefied hydrocarbon spherical tank 1, the specific steps of which are:

[0034] (1) First, the interface height position H0 of the liquefied hydrocarbon and water interface in the water cut tank 4 where water cut is to be initiated is set in the water cut controller 30;

[0035] (2) Next, the interface height position of the liquefied hydrocarbon and water interface in the cut-off tank 4 is measured by the interface level meter 9. When the position reaches H0, the cut-off controller 30 receives the detected interface height data, and the cut-off controller 30 sends a signal to close the cut-off valve 8 and the inlet valve 6, start the balancing valve 11, and connect the pressure balancing pipeline 20. The pressure above and below the float valve device 7 in the cut-off tank 4 reaches equilibrium, and the float 72 floats up. Then the balancing valve 11 is closed, and the cut-off valve 8 is opened to connect the cut-off pipeline 10 for drainage.

[0036] (3) Then, when the water level drops to a low level, the float 72 automatically blocks the water outlet of the float valve body 71 after falling, closing the water cut-off valve 8 to stop drainage;

[0037] (4) Finally, when the interface meter 9 fails due to long-term use or malfunctions and is unable to accurately detect the height position of the interface between liquefied hydrocarbon and water in the water cut-off tank 4, the three external liquid level switches 12 will calibrate the accuracy of the measurement value of the interface meter 9, thereby calibrating whether the interface meter 9 can be used normally. If the calibration result shows that the measurement value of the interface meter 9 is inaccurate, the control system will automatically close the water cut-off valve 8 and alarm, waiting for the fault to be handled.

[0038] The present invention is not limited to the above-mentioned embodiments. Any changes or modifications to the present invention that do not depart from the spirit and scope of the present invention, and if these changes and modifications fall within the scope of the claims and equivalent technologies of the present invention, the present invention is also intended to include these changes and modifications.

Claims

1. An intelligent water cut-off system for a liquefied hydrocarbon spherical tank, comprising a spherical tank, characterized in that: The bottom of the spherical tank is connected in sequence via pipelines with a tank root valve, a sand settling pipe, and a water cut-off tank. The end of the tank root valve extends into the sand settling pipe through a downpipe. An inlet valve is provided on the connecting pipeline between the sand settling pipe and the water cut-off tank. A water cut-off pipeline is provided at the water outlet at the bottom of the water cut-off tank. A float valve device is provided at the water outlet at the bottom of the water cut-off tank. A water cut-off valve is installed on the water cut-off pipeline. A contact level gauge extending into the water cut-off tank and capable of continuously detecting the hydrocarbon / water interface is provided on the top of the water cut-off tank. A pressure balancing pipeline is provided between the side wall opening of the water cut-off tank and the water cut-off pipeline. A balancing valve is installed on the pressure balancing pipeline. The invention also includes a water cut-off controller: the water cut-off controller is connected to the inlet valve, the interface level meter, the water cut-off valve, and the balancing valve through electrical signals, and controls the start and close of the inlet valve, the water cut-off valve, and the balancing valve in real time according to the reading of the interface height position of the liquefied hydrocarbon and water interface read by the interface level meter; It also includes a plurality of external liquid level switches installed on the outer side wall of the water cutting tank from top to bottom and used for calibrating the boundary level meter.

2. The intelligent water cutting system for liquefied hydrocarbon spherical tank according to claim 1 is characterized in that: The external liquid level switch is a non-contact ultrasonic liquid level sensor.

3. The intelligent water cutting system for liquefied hydrocarbon spherical tank according to claim 2 is characterized in that: There are three external liquid level switches, which are respectively located at three different height positions of the upper, middle and lower side walls of the water cutting tank.

4. The intelligent water cutting system for liquefied hydrocarbon spherical tank according to claim 2 is characterized in that: There are two external liquid level switches, which are respectively located at two different height positions, upper and lower, on the side wall of the water cutting tank.

5. The intelligent water cut-off system for liquefied hydrocarbon spherical tanks according to claim 2 is characterized in that: There is one external liquid level switch, which is located at a height position in the middle of the side wall of the water cutting tank.

6. The intelligent water cutting system for liquefied hydrocarbon spherical tank according to claim 1 is characterized in that: The float valve device includes a float valve body, a float, and a limit assembly. The outlet end of the float valve body is connected to the water cut pipeline. The float valve body and the limit assembly are both installed at the bottom position in the water cut tank. The float is placed in the area surrounded by the float valve body and the limit assembly. The density of the float is between the density of water and the density of liquefied hydrocarbons.

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