Normal-pressure large tank emptying device

Abstract

The utility model discloses a normal-pressure large tank emptying device which comprises an emptying pipe, a pneumatic control valve; the temperature transmitter is arranged between the pneumatic control valve and the connection position of the blow-down pipe and the normal-pressure large tank; the ventilation pipe is arranged between the pneumatic control valve and the tail end of the blow-down pipe, and normal-temperature compressed air is introduced into the ventilation pipe; the electromagnetic valve is arranged on the ventilation pipe; the controller is electrically connected with the temperature transmitter and the electromagnetic valve respectively; when the temperature measured by the temperature transmitter is lower than-10 DEG C, the controller controls the electromagnetic valve to be opened; when the temperature is higher than 0 DEG C, the electromagnetic valve is controlled to be closed. Normal-temperature compressed gas is introduced to reheat low-temperature gas, outlet freezing is prevented, potential hazards are eliminated, manual intervention is not needed in the whole process, and the workload and the labor intensity are reduced; and the electromagnetic valve is closed, rewarming is stopped, resource waste is avoided, and greenness and economy are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied gas containers, and particularly relates to an atmospheric pressure large tank venting device. Background Technique

[0002] Due to a large amount of low-temperature liquid stored in the atmospheric pressure large tank and a large evaporation rate, the pneumatic pressure reducing regulating valve at the vent is always in a slightly open state, and the gas is continuously vented at a low temperature, resulting in long-term icing at the gas outlet of the vent. To a certain extent, the ice cubes fall off, which may accidentally injure the operator or damage the equipment, causing a safety accident.

[0003] The Chinese patent document with the publication number CN203671237U discloses a low-temperature liquefied gas transport vehicle and a venting device. The venting device is arranged in the low-temperature liquefied gas transport vehicle. The low-temperature liquefied gas transport vehicle includes a container. The venting device includes a venting pipeline, a main vent valve, and a drain valve. One end of the venting pipeline communicates with the inside of the container, and the other end has a vent opening communicating with the outside. The main vent valve is arranged on the venting pipeline and is located inside the container. The drain valve is arranged on the venting pipeline, and the drain valve can be opened to drain the liquid in the venting pipeline.

[0004] Although the above patent solution is provided with a drain valve for draining the liquid during the venting process to prevent icing, it only prevents internal icing, and the icing of the cold air flow at the end of the vent pipe or the icing caused by the condensation of water vapor in the external air when it meets the cold at the end of the vent pipe cannot be effectively eliminated. Therefore, the above patent solution cannot meet the use requirements to a certain extent. Content of the Utility Model

[0005] In order to overcome the technical problem in the prior art that due to the release of low-temperature gas at the end of the vent pipe of the atmospheric pressure large tank, the water vapor in the air condenses into ice at this position, and there are potential safety hazards in the long run, and manual deicing is often required; an object of the utility model is to provide an atmospheric pressure large tank venting device, by setting a temperature transmitter on the vent pipe, when the measured temperature is lower than -10°C, introducing normal temperature compressed air into the end of the vent pipe, using the normal temperature gas to reheat the low-temperature gas, preventing icing at the outlet, eliminating potential risks and without manual operation.

[0006] To achieve the above object, the utility model adopts the following technical solutions: An atmospheric pressure large tank venting device includes a vent pipe, and a pneumatic control valve is arranged in the middle of the vent pipe; a temperature transmitter is arranged on the vent pipe and is located between the pneumatic control valve and the connection position of the vent pipe and the atmospheric pressure large tank; a vent gas pipe is arranged on the vent pipe and is communicated with the vent pipe. The vent gas pipe is located between the pneumatic control valve and the end of the vent pipe, and normal temperature compressed air is introduced into the vent gas pipe; a solenoid valve is arranged on the vent gas pipe for controlling the on-off state of the vent gas pipe; a controller is electrically connected to the temperature transmitter and the solenoid valve respectively; wherein, when the temperature measured by the temperature transmitter is lower than -10°C, the controller controls the solenoid valve to open; when the temperature measured by the temperature transmitter is higher than 0°C, the controller controls the solenoid valve to close.

[0007] The vent pipe has a heat conduction effect, and the temperature detection position of the temperature transmitter can more objectively reflect the temperature condition at the end of the vent pipe, and objectively judge whether icing occurs accurately; the introduction of the normal temperature compressed air warms the low-temperature gas in the vent pipe after passing through the end of a small section of the vent pipe, preventing icing at the outlet; the detection position of the temperature transmitter will not contact the normal temperature compressed air, which can more accurately judge the temperature of the vent pipe and also prevent the instantaneous heat and cold alternation from affecting the accuracy of the temperature transmitter.

[0008] Further, a normal temperature stop valve for controlling on-off is arranged on the vent gas pipe; the normal temperature stop valve is located between the solenoid valve and the end of the vent gas pipe; the normal temperature stop valve is switched by manual drive.

[0009] Manual operation can control whether to defrost the venting device, increasing the scope of application and applicable scenarios.

[0010] Further, the vent pipe includes a first straight pipe, the first straight pipe is arranged on the atmospheric pressure large tank and is communicated with its interior; a second straight pipe, the second straight pipe is arranged at the end of the first straight pipe and forms a 90-degree angle with it; an elbow pipe is arranged between the first straight pipe and the second straight pipe and is used to connect the two; the temperature transmitter is arranged on the second straight pipe.

[0011] It can prevent the air flow impact of the atmospheric pressure large tank from damaging the temperature transmitter or affecting its accuracy during the venting process.

[0012] Specifically, the diameter of the vent pipe is more than ten times the diameter of the vent gas pipe.

[0013] When the normal-temperature compressed air passes through the vent pipe with a small diameter, it will maintain a relatively fast flow rate, and only when it enters the vent pipe will the flow rate decrease, thereby ensuring that the normal-temperature compressed air reheats the low-temperature gas in the vent pipe, rather than the low-temperature gas cooling the gas in the vent pipe.

[0014] Further, at least one support rod is provided between the second straight pipe and the atmospheric pressure large tank.

[0015] Further, a heat-insulating material is provided on the outer wall of the vent pipe, and the heat-insulating material is used to prevent the vent pipe from directly exchanging heat with the air, that is, to prevent the pipe wall from freezing.

[0016] Further, the end of the vent pipe is inclined downward; an inclined opening with an opening downward is provided at the end of the vent pipe, and the inclined opening facilitates the discharge of the vent pipe, such as droplets formed by the condensation of water vapor in the air when it is cooled.

[0017] Further, the atmospheric pressure large tank includes an outer container; an inner container, the inner container is arranged inside the outer container; a filler, the filler is located between the outer container and the inner container; the vent pipe is communicated with the inner container; a sleeve is provided at the position where the vent pipe penetrates through the outer container.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows: By installing a temperature transmitter at the inlet of the pneumatic control valve and a solenoid valve and a manual stop valve at the outlet to control the opening and closing of the normal-temperature compressed air, when the pressure of the normal-temperature large tank reaches the vent setting pressure, the pneumatic control valve opens for venting. When the temperature transmitter measures that the temperature is lower than -10°C, a feedback signal is sent to the controller, and the solenoid valve is controlled to open to introduce normal-temperature compressed gas to reheat the low-temperature gas, preventing ice formation at the outlet, eliminating potential hazards, and the whole process does not require manual intervention, reducing the workload and labor intensity; when the temperature is greater than 0°C, the solenoid valve is closed to stop reheating, avoiding waste of resources and being more green and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present utility model;

[0020] In the figure: 11, inner container; 12, outer container; 13, filler; 14, support rod; 21, vent pipe; 211, first straight pipe; 212, second straight pipe; 213, inclined opening; 22, heat-insulating material; 23, sleeve; 3, pneumatic control valve; 4, temperature transmitter; 5, vent pipe; 6, solenoid valve; 7, normal-temperature stop valve; 8, controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, in combination with the accompanying drawings and specific embodiments, the present utility model will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0022] In the description of the present utility model, it should be noted that for orientation terms, such as the terms "center", "horizontal", "vertical", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the indicated orientation and position relationships are based on the orientation or position relationships shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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, and should not be construed as limiting the specific protection scope of the present utility model.

[0023] In addition, such terms as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise specifically defined.

[0024] In the present utility model, unless otherwise clearly specified and limited, such terms as "set", "installed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or connected through an intermediate medium, and can be connected internally between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0025] See Figure 1, An atmospheric large tank venting device, comprising an atmospheric large tank; a vent pipe 21, the vent pipe 21 is arranged at the top of the atmospheric large tank; a pneumatic control valve 3, the pneumatic control valve 3 is arranged in the middle of the vent pipe 21 for controlling the on-off state of the vent pipe 21; a temperature transmitter 4, the temperature transmitter 4 is arranged on the vent pipe 21 and is located between the pneumatic control valve 3 and the connection position of the vent pipe 21 and the atmospheric large tank; a ventilation pipe 5, the ventilation pipe 5 is arranged on the vent pipe 21 and is communicated with the vent pipe 21, the ventilation pipe 5 is located between the pneumatic control valve 3 and the end of the vent pipe 21, and normal temperature compressed air is passed through the ventilation pipe 5; a solenoid valve 6, the solenoid valve 6 is arranged on the ventilation pipe 5 for controlling the on-off state of the ventilation pipe 5; a controller 8, the controller 8 is electrically connected to the temperature transmitter 4 and the solenoid valve 6 respectively.

[0026] When the temperature measured by the temperature transmitter 4 is lower than -10°C, the controller 8 controls the solenoid valve 6 to open, and the normal temperature compressed air continuously enters the vent pipe 21 through the ventilation pipe 5 to reheate the low-temperature gas; when the temperature measured by the temperature transmitter 4 is greater than 0°C, the controller 8 controls the solenoid valve 6 to close, and the normal temperature compressed air no longer enters the vent pipe 21.

[0027] A normal temperature stop valve 7 for controlling on-off is arranged on the ventilation pipe 5; the normal temperature stop valve 7 is located between the solenoid valve 6 and the end of the ventilation pipe 5; the normal temperature stop valve 7 is switched by manual drive; the end of the ventilation pipe 5 is communicated with a compressor through a hose.

[0028] The atmospheric large tank includes an outer container 12; an inner container 11, the inner container 11 is arranged inside the outer container 12; a filler 13, the filler 13 is located between the outer container 12 and the inner container 11, and the filler 13 is a heat-insulating material such as perlite sand. The vent pipe 21 includes a first straight pipe 211, the first straight pipe 211 is arranged on the atmospheric large tank and is communicated with its interior; a second straight pipe 212, the second straight pipe 212 is arranged at the end of the first straight pipe 211 and forms a 90-degree angle with it; a bent pipe, the bent pipe is arranged between the first straight pipe 211 and the second straight pipe 212.

[0029] The first straight pipe 211 is communicated with the inner container 11; a sleeve 23 is arranged at the position where the first straight pipe 211 passes through the outer container 12; the temperature transmitter 4 is arranged on the second straight pipe 212 and is not directly opposite to the first straight pipe 211; at least one support rod 14 is arranged between the second straight pipe 212 and the atmospheric large tank.

[0030] The diameter of the vent pipe 21 is more than ten times the diameter of the vent gas pipe 5; a heat preservation material 22 is arranged on the outer wall of the vent pipe 21; the end of the vent pipe 21 inclines downward; an inclined opening 213 with an opening facing downward is arranged at the end of the vent pipe 21; icing is likely to occur at the position of the inclined opening 213.

[0031] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A large tank emptying device at normal pressure, characterized in that: Included A vent pipe, wherein a pneumatic regulating valve is arranged in the middle of the vent pipe; A temperature transmitter, which is arranged on the vent pipe and is located between the pneumatic regulating valve and the connection position between the vent pipe and the atmospheric pressure tank; A vent pipe, the vent pipe is arranged on the vent pipe and is in communication with the vent pipe, the vent pipe is located between the pneumatic regulating valve and the end of the vent pipe, and normal temperature compressed air flows through the vent pipe; a solenoid valve, the solenoid valve being arranged on the vent pipe and being used to control the on / off state of the vent pipe; a controller, the controller being electrically connected to the temperature transmitter and the solenoid valve respectively; When the temperature measured by the temperature transmitter is lower than -10°C, the controller controls the solenoid valve to open; when the temperature measured by the temperature transmitter is greater than 0°C, the controller controls the solenoid valve to close.

2. The venting device according to claim 1, characterized in that: The vent pipe is provided with a normal temperature stop valve for controlling on and off; the normal temperature stop valve is located between the solenoid valve and the end of the vent pipe; the normal temperature stop valve is switched by human power.

3. The venting device according to claim 1, characterized in that: The vent pipe includes a first straight pipe, which is arranged on the atmospheric pressure tank and connected to the interior thereof; a second straight pipe, which is arranged at the end of the first straight pipe and forms a ninety-degree angle therewith; a bent pipe, which is arranged between the first straight pipe and the second straight pipe and is used to connect the two; and the temperature transmitter is arranged on the second straight pipe.

4. The venting device according to claim 1, characterized in that: The diameter of the vent pipe is ten times greater than the diameter of the ventilation pipe.

5. The venting device according to claim 3, characterized in that: At least one supporting rod is arranged between the second straight pipe and the large normal pressure tank.

6. The venting device according to any one of claims 1 to 5, characterized in that: The outer wall of the vent pipe is provided with heat-insulating material.

7. The venting device according to any one of claims 1 to 5, characterized in that: The end of the vent pipe is inclined downward; the end of the vent pipe is provided with an inclined opening opening facing downward.

8. The venting device according to any one of claims 1 to 5, characterized in that: The atmospheric pressure tank includes an outer container; an inner container, which is arranged inside the outer container; a filler, which is located between the outer container and the inner container; the vent pipe is connected to the inner container; and a sleeve is provided at the position where the vent pipe passes through the outer container.

9. The venting device according to claim 6, characterized in that: The end of the vent pipe is inclined downward; the end of the vent pipe is provided with an inclined opening opening facing downward.

10. The venting device according to claim 6, characterized in that: The atmospheric pressure tank includes an outer container; an inner container, which is arranged inside the outer container; a filler, which is located between the outer container and the inner container; the vent pipe is connected to the inner container; and a sleeve is provided at the position where the vent pipe passes through the outer container.

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