Liquid substance storage protection device

Abstract

The utility model discloses a liquid substance storage protection device which comprises a storage container, an air inlet pipeline, a feeding pipeline, an air outlet pipeline, a discharging pipeline, a pressure sensing mechanism, a first valve, a second valve, a third valve and a fourth valve. The storage container is provided with an air inlet port, a feeding port, an air outlet port and a discharging port; the air inlet pipeline, the feeding pipeline, the air outlet pipeline and the discharging pipeline are respectively connected with the air inlet port, the feeding port, the air outlet port and the discharging port; the air inlet port and the air outlet port are formed in the upper portion of the storage container, the feeding port is formed below the air inlet port, and the discharging port is formed in the lower portion of the storage container; and the pressure sensing mechanism is connected to the upper part of the storage container. According to the liquid substance storage protection device, the air seal pressure in the storage container can be always in a proper micro-positive pressure state, air is effectively isolated, the risks of fire disasters and explosions are reduced to the minimum, and damage to equipment and operators is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid material storage, and relates to a storage device, in particular to a liquid material storage protection device. Background Art

[0002] There may be explosive gases in the gas phase of organic waste storage tanks. To avoid explosion, inert gas sealing method, also known as nitrogen sealing, should be adopted. The inert gas commonly used is nitrogen.

[0003] By nitrogen sealing the gas phase of the tank body to maintain a slight positive pressure in the storage tank, the contact between the gas phase of the stored waste liquid material and the outside world is isolated, reducing the danger caused by the volatilization of the stored waste liquid material, thereby protecting the storage tank from always being in a safe operating state.

[0004] In view of this, there is an urgent need to design a new liquid substance storage protection device to overcome at least part of the above-mentioned defects of the existing liquid substance storage protection devices. Utility Model Content

[0005] The utility model provides a liquid material storage protection device, which can keep the gas sealing pressure in the storage container always in a suitable micro-positive pressure state, effectively isolate the air, minimize the risk of fire and explosion, and avoid damage to equipment and operators.

[0006] In order to solve the above technical problems, according to one aspect of the utility model, the following technical solution is adopted:

[0007] A liquid material storage and protection device, the liquid material storage and protection device comprising: a storage container, an air inlet pipeline, a feed pipeline, an air outlet pipeline, a discharge pipeline, a pressure sensing mechanism, a first valve, a second valve, a third valve and a fourth valve;

[0008] The first valve, the second valve, the third valve and the fourth valve are respectively arranged on the air inlet pipeline, the feed pipeline, the air outlet pipeline and the discharge pipeline;

[0009] The storage container is provided with an air inlet port, a feed port, an air outlet port and a discharge port, and the air inlet pipeline, the feed pipeline, the air outlet pipeline and the discharge pipeline are connected to the air inlet port, the feed port, the air outlet port and the discharge port respectively;

[0010] The air inlet port and the air outlet port are arranged at the upper part of the storage container, the feed port is arranged below the air inlet port, and the discharge port is arranged at the lower part of the storage container; the pressure sensing mechanism is connected to the upper part of the storage container.

[0011] As an embodiment of the present utility model, the liquid material storage protection device further comprises a second storage container, the second storage container is connected to the storage container via a second air outlet pipeline; the second storage container is connected to the storage container via a second air inlet pipeline;

[0012] The second air outlet pipeline is provided with a first one-way valve and a sixth valve, the second air inlet pipeline is provided with a second one-way valve and a seventh valve; the second storage container is provided with a second pressure sensing mechanism for sensing the air pressure in the second storage container.

[0013] As an implementation mode of the utility model, the air intake pipeline is used to connect to the inactive gas storage container, and the air intake pipeline is provided with a first air intake sub-pipeline and a second air intake sub-pipeline; the first air intake sub-pipeline is provided with a fifth valve, and the second air intake sub-pipeline is provided with the first valve.

[0014] As an implementation mode of the utility model, the first air intake sub-pipeline is further provided with a first stop valve and a second stop valve, and the first stop valve and the second stop valve are respectively provided on both sides of the fifth valve;

[0015] The second air intake sub-pipeline is further provided with a third stop valve and a fourth stop valve, and the third stop valve and the fourth stop valve are respectively provided on both sides of the first valve.

[0016] As an implementation mode of the utility model, the fifth valve is a quick-opening pneumatic switch valve, and the first valve is a self-operated air supply valve; a Y-type filter is further arranged between the first valve and the third stop valve.

[0017] As an implementation mode of the utility model, the storage container is provided with a breathing valve connection port, and the breathing valve connection port is connected to the breathing valve through a pipeline.

[0018] As an implementation mode of the utility model, the storage container is provided with a bursting disc connection port, and the bursting disc connection port is connected to the bursting disc through a pipeline.

[0019] As an implementation mode of the utility model, the feed pipeline is provided with a feed pump, and the discharge pipeline is provided with a discharge pump.

[0020] The beneficial effect of the utility model is that the liquid material storage protection device proposed by the utility model can keep the gas sealing pressure in the storage container in a suitable micro-positive pressure state at all times, effectively isolate the air, minimize the risk of fire and explosion, and avoid damage to equipment and operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a liquid substance storage and protection device in one embodiment of the utility model.

[0022] Figure 2 This is a schematic diagram of a usage scenario of a liquid substance storage protection device in one embodiment of the utility model.

[0023] Figure 3 This is a schematic diagram of the relationship between each valve body and bursting disc and the nitrogen sealing pressure in one embodiment of the utility model. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0025] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0026] The description in this section is only for several typical embodiments, and the present invention is not limited to the scope of the embodiments. The same or similar prior art means and some technical features in the embodiments are mutually replaced and are also within the scope of the present invention.

[0027] The term “connection” in the specification includes both direct connection and indirect connection.

[0028] The utility model discloses a liquid material storage protection device. Figure 1 This is a schematic diagram of the structure of a liquid substance storage and protection device in one embodiment of the utility model. Figure 2 This is a schematic diagram of a use scenario of a liquid substance storage protection device in one embodiment of the utility model; please refer to Figure 1 , Figure 2 The liquid material storage and protection device includes: a storage container 1, an air inlet pipeline 2, a feed pipeline 3, an air outlet pipeline 4, a discharge pipeline 5, a pressure sensing mechanism 10, a first valve 6, a second valve 7, a third valve 8 and a fourth valve 9.

[0029] The first valve 6, the second valve 7, the third valve 8 and the fourth valve 9 are respectively arranged on the air inlet pipeline 2, the feed pipeline 3, the air outlet pipeline 4 and the discharge pipeline 5. The storage container 1 is provided with an air inlet port 11, a feed port 12, an air outlet port 13 and a discharge port 14, and the air inlet pipeline 2, the feed pipeline 3, the air outlet pipeline 4 and the discharge pipeline 5 are respectively connected to the air inlet port 11, the feed port 12, the air outlet port 13 and the discharge port 14.

[0030] The air inlet port 11 and the air outlet port 13 are arranged at the upper part of the storage container 1, the feed port 12 is arranged below the air inlet port 11, and the outlet port 14 is arranged at the lower part of the storage container 1; the pressure sensing mechanism 10 is connected to the upper part of the storage container 1.

[0031] In one embodiment of the utility model, the air intake pipeline 2 is used to connect the inert gas storage container 15, and the air intake pipeline 2 is provided with a first air intake sub-pipeline 21 and a second air intake sub-pipeline 22; the first air intake sub-pipeline 21 is provided with a fifth valve 23, and the second air intake sub-pipeline 22 is provided with the first valve 6; the first valve 6 can be a pressure relief valve. The inert gas storage container 15 can store nitrogen, and a pressure gauge 20 is provided at the air intake of the inert gas storage container 15.

[0032] The first air intake sub-pipeline 21 is further provided with a first stop valve 24 and a second stop valve 25, and the first stop valve 24 and the second stop valve 25 are respectively provided on both sides of the fifth valve 23; the second air intake sub-pipeline 22 is further provided with a third stop valve 26 and a fourth stop valve 27, and the third stop valve 26 and the fourth stop valve 27 are respectively provided on both sides of the first valve 6.

[0033] The fifth valve 23 is a quick-opening pneumatic switch valve, and the first valve 6 is a self-operated air supply valve; a Y-type filter 28 is further arranged between the first valve 6 and the third stop valve 26 .

[0034] The storage container 1 is provided with a breathing valve connection port, and the breathing valve connection port is connected to the breathing valve 16 through a pipeline. The storage container 1 is provided with a bursting disc connection port, and the bursting disc connection port is connected to the bursting disc 17 through a pipeline. The upper part of the storage container 1 is also connected to a first nitrogen sealing pressure transmitter 29 and a second nitrogen sealing pressure transmitter 30. The feed pipeline 3 is provided with a feed pump 18, and the discharge pipeline 4 is provided with a discharge pump 19.

[0035] In one usage scenario of the utility model, when the liquid outlet valve of the storage tank is opened, the liquid level drops, the gas phase volume of the storage tank will increase, and the nitrogen pressure in the tank decreases - the nitrogen supply valve is opened, nitrogen is injected into the storage tank, and the nitrogen pressure in the tank rises. When the pressure in the tank rises to the pressure setting value of the nitrogen supply valve, the nitrogen supply valve automatically closes.

[0036] When the liquid inlet valve of the storage tank is opened, the liquid level rises, the gas phase volume of the storage tank will decrease, and the nitrogen pressure in the tank increases. When its pressure is higher than the pressure setting value of the nitrogen release valve, the pressure relief valve opens and discharges after passing through the absorption device, causing the nitrogen pressure in the tank to drop. When it drops to the pressure setting value of the pressure relief valve, the nitrogen release valve automatically closes.

[0037] After the storage tank is put into use normally, the nitrogen sealing system may cause accidents due to improper original design or maintenance. For example, the nitrogen sealing system may leak in one way or another. Due to the complex structure of the nitrogen sealing valve and the pressure relief valve, units with movable components, command controllers and seals may fail. In addition, the faulty tank top pressure transmitter will incorrectly indicate the nitrogen pressure at the tank top, which will cause the operator in the central control room to misjudge. For example, when the nitrogen sealing valve cannot be fully opened, the inflow of nitrogen will become too low, resulting in a drop in the pressure in the top space, which will cause the storage tank to implode or air to leak into the storage tank, making it impossible to achieve the nitrogen sealing effect required for safety. In summary, these situations will affect the normal operation of the storage tank, and depending on the stored products, will greatly increase the risk of explosion.

[0038] The nitrogen sealing protection device of the utility model can be used as a complete automatic control system, which fully considers the disposal measures when abnormal situations occur in key measuring instruments and valves in the control system, so that the nitrogen sealing of the storage tank can be effectively and reliably controlled, and the nitrogen consumption can be reduced. The nitrogen sealing pressure in the storage tank is always in a suitable micro-positive pressure state, effectively isolating the air, and minimizing the risk of fire and explosion, thereby avoiding damage to equipment and operators.

[0039] The nitrogen from the boundary area first enters the nitrogen storage tank for pressure stabilization and then is output. The output pipeline is divided into two parallel routes: the first route is the main route, which adjusts the pressure to 0.8~1.2KPa through the self-operated nitrogen supply valve to transport nitrogen to subsequent storage tanks. When the gas phase space pressure of the storage tank is lower than the pressure setting value for some reason, the nitrogen supply valve opens and starts to replenish nitrogen. When the gas phase space pressure is higher than the pressure setting value, the nitrogen supply valve closes and stops the nitrogen supply, thereby ensuring that the storage tank does not inhale air during normal operation to prevent the formation of explosive gas; the second route is the backup system of the first route. Under normal circumstances, the quick-opening pneumatic switch valve is in a closed state. Only when the nitrogen supply valve fails to open or the liquid discharge speed of the storage tank is too fast, resulting in the nitrogen blanketing pressure being too low to less than 0.5KPa, this automatic control system will automatically open the pneumatic switch valve for nitrogen replenishment after performing a two-out-of-two logic judgment through the two sets of nitrogen blanketing pressure transmitters installed on the top of the tank. When the nitrogen blanketing pressure is greater than 1KPa, it will automatically close. At the same time, the relevant nitrogen blanketing pressure change alarm and pneumatic switch valve action information will be fed back to the central control room for timely processing by the operation / maintenance personnel to avoid abnormal situations caused by too low tank pressure. The use of two-out-of-two logic judgment of nitrogen blanketing pressure also greatly reduces the malfunction of the pneumatic switch valve and improves the safety and reliability of the entire nitrogen replenishment process.

[0040] In addition, three safety protections are set for the pressure relief process of the storage tank - truly realizing intrinsic safety. The first protection is the nitrogen-sealed pressure relief valve. When the nitrogen-sealed pressure is greater than the pressure setting value of the pressure relief valve (10KPa), it automatically opens and discharges through the absorption device to reduce the nitrogen pressure in the tank. When it drops to the pressure setting value of the pressure relief valve, the nitrogen relief valve automatically closes; the second protection is the breathing valve. When the nitrogen-sealed pressure is greater than the pressure setting value of the breathing valve (15KPa), it automatically opens and discharges through the absorption device to reduce the nitrogen pressure in the tank. When it drops to the pressure setting value of the breathing valve, the breathing valve automatically closes; the third protection is the bursting disc. When both the pressure relief valve and the breathing valve fail and the nitrogen sealing pressure is greater than 20KPa, the bursting disc will automatically crack and discharge directly, reducing the nitrogen pressure in the tank and protecting the storage tank body from damage. For the relationship diagram between the nitrogen replenishment valve, pneumatic switch valve, pressure relief valve, breathing valve and bursting disc and the nitrogen sealing pressure, please refer to Figure 3 .

[0041] In one usage scenario of the utility model, a nitrogen sealing control system is provided on the storage tank to maintain the gas phase space pressure in the tank at about 1KPa. When the gas phase space pressure is higher than 1.2KPa, the nitrogen supply valve is closed and the nitrogen supply is stopped; when the gas phase space pressure is lower than 0.8KPa, the nitrogen supply valve is opened and nitrogen is replenished to ensure that the storage tank does not inhale air during normal operation to prevent the formation of explosive gas; however, if the nitrogen supply valve fails to open during this operation or the liquid discharge speed of the storage tank is too fast, resulting in too low nitrogen sealing pressure, when the two nitrogen sealing pressure transmitters (PT1 and PT2) on site indicate that they are both less than 0.5KPa, this nitrogen sealing automatic control system will automatically open the pneumatic switch valve to replenish nitrogen after a two-out-of-two logic judgment, and automatically close the pneumatic switch valve to stop replenishing nitrogen when the nitrogen sealing pressure is greater than 1KPa. At the same time, the relevant nitrogen sealing pressure change alarm and pneumatic switch valve action information will be fed back to the central control room for the operation / maintenance personnel to arrange and handle in time.

[0042] In one embodiment of the utility model, the liquid material storage protection device further includes a second storage container, the second storage container is connected to the storage container via a second air outlet pipeline; the second storage container is connected to the storage container via a second air inlet pipeline. The second air outlet pipeline is provided with a first one-way valve and a sixth valve, the second air inlet pipeline is provided with a second one-way valve and a seventh valve; the second storage container is provided with a second pressure sensing mechanism for sensing the air pressure in the second storage container. This solution can store the discharged nitrogen, and when it needs to be sent to the storage container, the stored nitrogen can be used for secondary use, thereby saving energy.

[0043] In summary, the liquid material storage protection device proposed by the utility model can keep the gas sealing pressure in the storage container in a suitable micro-positive pressure state at all times, effectively isolate the air, minimize the risk of fire and explosion, and avoid damage to equipment and operators. The utility model is safe, stable, reliable, and easy to implement.

[0044] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The description and application of the utility model here are illustrative, and it is not intended to limit the scope of the utility model to the above-mentioned embodiments. The effects or advantages involved in the embodiments may not be embodied in the embodiments due to interference from various factors, and the description of the effects or advantages is not used to limit the embodiments. The deformation and changes of the embodiments disclosed here are possible, and the replacement of the embodiments and the various equivalent components are well known to those of ordinary skill in the art. It should be clear to those skilled in the art that the utility model can be implemented in other forms, structures, arrangements, proportions, and with other components, materials and parts without departing from the spirit or essential features of the utility model. Other deformations and changes can be made to the embodiments disclosed here without departing from the scope and spirit of the utility model.

Claims

1. A liquid material storage and protection device, characterized in that: The liquid material storage protection device comprises: a storage container, an air inlet pipeline, a feed pipeline, an air outlet pipeline, a discharge pipeline, a pressure sensing mechanism, a first valve, a second valve, a third valve and a fourth valve; The first valve, the second valve, the third valve and the fourth valve are respectively arranged on the air inlet pipeline, the feed pipeline, the air outlet pipeline and the discharge pipeline; The storage container is provided with an air inlet port, a feed port, an air outlet port and a discharge port, and the air inlet pipeline, the feed pipeline, the air outlet pipeline and the discharge pipeline are connected to the air inlet port, the feed port, the air outlet port and the discharge port respectively; The air inlet port and the air outlet port are arranged at the upper part of the storage container, the feed port is arranged below the air inlet port, and the discharge port is arranged at the lower part of the storage container; the pressure sensing mechanism is connected to the upper part of the storage container.

2. The liquid material storage protection device according to claim 1, characterized in that: The liquid material storage and protection device further comprises a second storage container, the second storage container is connected to the storage container via a second air outlet pipeline; the second storage container is connected to the storage container via a second air inlet pipeline; The second air outlet pipeline is provided with a first one-way valve and a sixth valve, the second air inlet pipeline is provided with a second one-way valve and a seventh valve; the second storage container is provided with a second pressure sensing mechanism for sensing the air pressure in the second storage container.

3. The liquid material storage protection device according to claim 1, characterized in that: The air intake pipeline is used to connect to the inactive gas storage container, and the air intake pipeline is provided with a first air intake sub-pipeline and a second air intake sub-pipeline; the first air intake sub-pipeline is provided with a fifth valve, and the second air intake sub-pipeline is provided with the first valve.

4. The liquid material storage protection device according to claim 3, characterized in that: The first air intake sub-pipeline is further provided with a first stop valve and a second stop valve, and the first stop valve and the second stop valve are respectively provided on both sides of the fifth valve; The second air intake sub-pipeline is further provided with a third stop valve and a fourth stop valve, and the third stop valve and the fourth stop valve are respectively provided on both sides of the first valve.

5. The liquid substance storage protection device according to claim 4, characterized in that: The fifth valve is a quick-opening pneumatic switch valve, and the first valve is a self-operated air supply valve; a Y-type filter is further arranged between the first valve and the third stop valve.

6. The liquid substance storage and protection device according to claim 1, characterized in that: The storage container is provided with a breathing valve connection port, and the breathing valve connection port is connected to the breathing valve through a pipeline.

7. The liquid substance storage and protection device according to claim 1, characterized in that: The storage container is provided with a bursting disc connection port, and the bursting disc connection port is connected to the bursting disc through a pipeline.

8. The liquid substance storage and protection device according to claim 1, characterized in that: The feed pipeline is provided with a feed pump, and the discharge pipeline is provided with a discharge pump.

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