A petrochemical storage tank breather valve detection system

Abstract

The utility model relates to the technical field of petroleum chemical industry storage safety technology and equipment detection technology, specifically discloses a kind of petrochemical storage tank breather valve detection system, including main storage tank, be configured in accordance with the target storage tank of setting proportion simulation, and in the top of main storage tank is provided for testing the breather valve;Three-way valve, three-way valve has first input interface, second input interface and an output interface;Air compressor, first input interface is communicated by pipeline fluid, and there is steady flow valve on the pipeline fluid communication of first input interface and air compressor;Centrifugal fan, second input interface is communicated by pipeline fluid.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical storage and transportation safety technology and equipment testing technology, specifically to a petrochemical storage tank breather valve testing system. Background Technology

[0002] In the industry, the calibration of breather valves often relies on small benchtop calibration benches with a gas phase volume of less than 1m³. Due to inherent defects in the principle of gas phase space volume and buffering effect, as well as dynamic distortion of flow rate and velocity conditions, the test results of such platforms are seriously inconsistent with the performance of breather valves in real storage tanks with gas phase space of tens of thousands of cubic meters, which need to cope with large flow rates of liquid inflow and emergency instantaneous large flow rates. This obscures key performance indicators and creates potential safety hazards. Utility Model Content

[0003] The purpose of this utility model is to provide a detection system for breather valves in petrochemical storage tanks, so as to solve the technical problem that the performance and behavior of breather valves differ greatly from the actual working conditions due to the defects of scale distortion and dynamic distortion of flow rate and velocity conditions in the existing breather valve testing and calibration.

[0004] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution:

[0005] A petrochemical storage tank breather valve detection system includes:

[0006] The main storage tank is configured to simulate the target storage tank according to a set ratio, and a breather valve for testing is installed on the top of the main storage tank;

[0007] A three-way valve, wherein the three-way valve has a first input port, a second input port, and an output port.

[0008] An air compressor is fluidly connected to the first input interface via a pipe, and a flow stabilizing valve is provided on the pipe that fluidly connects the first input interface to the air compressor;

[0009] The centrifugal fan is connected to the second input interface via a pipeline;

[0010] The three-way valve is configured to switch between a first operating state and a second operating state:

[0011] In the first working state, the first input interface is connected to the output interface, and the second input interface is isolated, so that the air compressor supplies air to the main storage tank through the flow regulator valve to simulate the pressure changes of normal oil receiving and dispensing operations;

[0012] In the second operating state, the second input interface is connected to the output interface, the first input interface is isolated, and the centrifugal fan supplies air to the main storage tank, causing the breathing valve to be fully open.

[0013] As a preferred embodiment of the present invention, it further includes a pressure detection unit and a control unit disposed in the main storage tank. The pressure detection unit is configured to monitor the air pressure in the main storage tank and send the air pressure signal to the control unit.

[0014] The control unit is configured to control the three-way valve to be in a first operating state when the system starts up, and to control the three-way valve to switch to a second operating state before the pressure in the main storage tank reaches the opening pressure of the breather valve.

[0015] As a preferred embodiment of this utility model, a floating roof is provided in the main storage tank, and the circumferential edge of the floating roof is sealed to the inner wall of the main storage tank.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] This invention achieves geometric similarity between the physical dimensions of the gas phase space of the target storage tank and the simulated storage tank by setting a ratio to simulate the storage tank, thereby fundamentally ensuring the dynamic similarity between the gas compression / expansion process and the real storage tank.

[0018] This invention utilizes a dual-air-path system that allows seamless switching between steady-flow, low-volume operating conditions and transient, high-volume impact operating conditions. This simulates the slow pressure changes during normal oil receiving and dispatching operations, enabling testing of the breather valve's opening pressure and assessing its ventilation capacity when fully open. It verifies whether the breather valve can protect the storage tank under the worst conditions, thus solving the problems of dimensional and dynamic distortion in existing breather valve testing. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0021] The labels in the diagram represent the following:

[0022] 1-Main storage tank; 2-Breathing valve; 3-Three-way valve; 31-First input interface; 32-Second input interface; 33-Output interface; 4-Air compressor; 41-Flow regulator; 5-Centrifugal fan. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] like Figure 1 As shown, this utility model provides a detection system for the breather valve of a petrochemical storage tank, comprising:

[0025] The main storage tank 1 is configured to simulate the target storage tank according to a set ratio, and a breather valve 2 for testing is installed on the top of the main storage tank 1.

[0026] The three-way valve 3 has a first input port 31, a second input port 32, and an output port 33.

[0027] The air compressor 4 is fluidly connected to the first input interface 31 through a pipe, and a flow stabilizing valve 41 is provided on the pipe that is fluidly connected to the first input interface 31 and the air compressor 4.

[0028] Centrifugal fan 5 is connected to the second input interface 32 via a pipeline.

[0029] The three-way valve 3 is configured to switch between a first operating state and a second operating state:

[0030] In the first operating state, the first input interface 31 and the output interface 33 are connected, while the second input interface 32 is isolated, allowing the air compressor 4 to supply air to the main storage tank 1 through the flow stabilizing valve 41, simulating the pressure changes during normal oil receiving and dispensing operations. During the test of the breather valve opening pressure, this circuit operates by filling the tank with a constant small flow rate (proportionally converted to correspond to the actual liquid inlet flow rate), accurately simulating the slow pressurization process of the storage tank.

[0031] In the second operating state, the second input interface 32 and the output interface 33 are connected, while the first input interface 31 is isolated. The centrifugal fan 5 supplies air to the main storage tank 1, causing the breather valve 2 to be fully open. When the system pressure reaches 90%-95% of the breather valve's set opening pressure, or when it is necessary to test its fully open flow capacity, this path is quickly switched via a two-position three-way valve. The fan can instantly provide air far exceeding the breather valve's rated flow rate, simulating extreme high-flow-rate conditions.

[0032] This implementation method mainly achieves accurate verification of the performance of the breather valve during operation by switching between the working states of the dual air sources of fluid and pressure.

[0033] It also includes a pressure detection unit and a control unit installed in the main storage tank 1. The pressure detection unit is configured to monitor the air pressure in the main storage tank 1 and send the air pressure signal to the control unit.

[0034] The control unit is configured to control the three-way valve 3 to be in the first working state when the system starts up, and to control the three-way valve 3 to switch to the second working state before the pressure in the main storage tank 1 reaches the opening pressure of the breathing valve 2.

[0035] A floating roof is installed in the main storage tank 1. The circumferential edge of the floating roof is sealed to the inner wall of the main storage tank 1. For the simulation of the internal floating roof tank, a scaled-down model of the floating roof and the edge sealing system can be used to study the impact of the floating roof operation on the gas phase space.

[0036] Specifically, this implementation method simulates the control parameters of the floating roof through specific calculations:

[0037] 1. Calculation of the volume (V1) of the gas phase space above the floating roof:

[0038] Tank parameters: Nominal volume 1500m³, with a design volume allowance. According to the design drawings, the tank diameter D = 34 meters, the total tank wall height H ≈ 17.82 meters, and the low-level floating roof height h = 2.41 meters.

[0039] Calculation formula: V1=π×(D / 2)²×(Hh).

[0040] Calculation result: V1=3.14×(17)²×(15.41)≈13984m³.

[0041] Key significance: This 13,984 m³ gas phase space is a "buffer pool" for pressure changes, and its huge volume is the fundamental reason for the slow rise in pressure.

[0042] 2. Calculation of volume change (ΔV) based on Boyle's law:

[0043] Pressure parameters: Initial pressure P1 = 101325 Pa (standard atmospheric pressure); Breathing valve opening pressure is 2000 Pa, P2 = 101325 Pa + 2000 Pa = 103325 Pa.

[0044] Physical law: Assuming it is an isothermal process (gas temperature remains constant), it conforms to Boyle's law P1×V1=P2×V2.

[0045] Calculation process:

[0046] The gas phase volume when the opening pressure is reached is V2=(P1×V1) / P2=(101325×13984) / 103325≈13713m³.

[0047] The volume of gas that needs to be replaced by the liquid is ΔV = V1 - V2 = 13984 - 13713 = 271 m³.

[0048] Key significance: It requires 271m³ of liquid to compress the gas in a 13984m³ space to the opening pressure of the breather valve.

[0049] 3. Calculation of start time (t):

[0050] Flow parameters: Maximum inlet flow rate of the storage tank Q = 850 m³ / h.

[0051] Calculation formula: t=ΔV / Q

[0052] Calculation result: t = 271 m³ / (850 m³ / h) ≈ 0.319 hours = 19.13 minutes.

[0053] Key significance: This 19.13 minutes is a key time reference in the experimental design to simulate the conventional slow pressure increase phase, and it is also a core parameter that distinguishes it from small-volume platforms (second-level pressure increase).

[0054] This embodiment takes a 1500m³ storage tank as an example, simulates it at a scale of 1:10000, and ensures that the geometric features such as diameter, height and dome shape are the same or similar. The gas phase volume of the main storage tank 1 is about 1.4m³, that is, 13984 / 10000, to accurately reproduce the scale effect between the main storage tank 1 and the target storage tank.

[0055] The main storage tank 1 uses the same steel as the target storage tank (such as Q235B), and the interface flange standard and installation position of the breather valve 2 are consistent with the site, eliminating test errors caused by differences in installation and materials.

[0056] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. A detection system for a breather valve in a petrochemical storage tank, characterized in that, include: The main storage tank (1) is configured to simulate the target storage tank according to a set ratio, and a breather valve (2) for testing is provided on the top of the main storage tank (1). A three-way valve (3) has a first input port (31), a second input port (32), and an output port (33). An air compressor (4) is fluidly connected to the first input interface (31) via a pipe, and a flow stabilizing valve (41) is provided on the pipe that is fluidly connected to the first input interface (31) and the air compressor (4). Centrifugal fan (5) is fluidly connected to the second input interface (32) through a pipeline; The three-way valve (3) is configured to switch between a first operating state and a second operating state: In the first working state, the first input interface (31) is connected to the output interface (33), and the second input interface (32) is isolated, so that the air compressor (4) supplies air to the main storage tank (1) through the flow regulator (41) to simulate the pressure changes of normal oil receiving and dispatching operations; In the second working state, the second input interface (32) is connected to the output interface (33), the first input interface (31) is isolated, the centrifugal fan (5) supplies air to the main storage tank (1), and the breathing valve (2) reaches the fully open state.

2. The petrochemical storage tank breather valve detection system according to claim 1, characterized in that, It also includes a pressure detection unit and a control unit disposed in the main storage tank (1), wherein the pressure detection unit is configured to monitor the air pressure in the main storage tank (1) and send the air pressure signal to the control unit; The control unit is configured to control the three-way valve (3) to be in a first working state when the system is started, and to control the three-way valve (3) to switch to a second working state before the pressure in the main storage tank (1) reaches the opening pressure of the breathing valve (2).

3. The petrochemical storage tank breather valve detection system according to claim 1, characterized in that, A floating roof is provided in the main storage tank (1), and the circumferential edge of the floating roof is sealed to the inner wall of the main storage tank (1).

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