A blasting needle valve testing device and method

Abstract

The application discloses a burst needle valve testing device, and belongs to the technical field of petroleum chemical industry, oil and gas storage and transportation. The burst needle valve testing device comprises a storage tank, a first material conveying pipe and a first control valve group, a second material conveying pipe and a second control valve group, and a third material conveying pipe; a bubble detector is arranged to detect the bubble amount of the output end of the third material conveying pipe; under the condition that the bubble amount is a first preset value, the pressure value detected by a pressure detector is a sealing pressure value of the burst needle valve; and under the condition that the bubble amount is a second preset value, the pressure value detected by the pressure detector is an opening pressure value of the burst needle valve. Before the burst needle valve is tested, liquid nitrogen is introduced into the storage tank, so that the temperature value of the whole burst needle valve testing device can be kept in a low temperature range, the test temperature of the burst needle valve can be approximately the same as the actual working temperature, and therefore the accuracy and reliability of the burst needle valve testing can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of petrochemical industry, oil and gas storage and transportation, and particularly relates to a burst needle valve testing device and method. BACKGROUND

[0002] The burst needle valve is applied to liquefied natural gas, ethylene, ethane and other liquefied hydrocarbon receiving stations. A large amount of evaporation gas is generated during the operation of the liquefied hydrocarbon. Under normal circumstances, the evaporation gas is recovered through a recondensation process to achieve zero emission of the evaporation gas, thereby avoiding environmental pollution and greenhouse effect. However, under abnormal circumstances, such as starting, stopping and overpressure accident, a part of the gas is discharged into the flare system, and the evaporation gas is burned by a burner, which is also a typical treatment and discharge process in the petrochemical industry and oil and gas storage and transportation industry.

[0003] Most of the evaporation gas is burned by a high-level flare or a ground flare. The ground flare is outstanding due to small fireproof spacing, small radiation influence, small land occupation and small land acquisition pressure. The ground flare should be provided with a burst needle valve or a burst disc to achieve intrinsic safety discharge. The burst needle valve is the first choice for the key components of the ground flare due to small set point deviation, high valve reliability and online recovery. The working principle of the burst needle valve is as follows: under normal conditions, the medium pressure in the pipeline is lower than the set pressure, the burst needle is stable, and the burst needle type emergency pressure relief device is in a closed state. Under abnormal conditions, the medium pressure in the pipeline reaches the set pressure, the burst needle is unstable, the burst needle type pressure relief device is instantaneously opened, and pressure relief is achieved. According to the supply status of the burst needle valve, the supplier usually purchases the valve body of a mature supplier, designs the actuator and the pilot pressure taking point, and integrates the burst needle valve as a whole. After assembly, the burst needle valve is subjected to normal temperature sealing test, low temperature sealing test and low temperature valve opening test.

[0004] Most of the evaporation gas is discharged at a temperature of-150℃ to-130℃. In order to ensure the mildness and accuracy of the burst needle valve in the actual operating environment, the test temperature should also be maintained at-150℃ to-130℃. However, during the project implementation process, the low temperature sealing test device, the low temperature opening test device and the process and method of the burst needle valve lack the guidance of industry standards, and most of them cannot meet the test temperature of the application conditions of the burst needle valve, resulting in poor test accuracy and reliability of the burst needle valve, and even affecting the safety of the actual operation process. SUMMARY

[0005] The application aims to at least solve the technical problem of poor test accuracy and reliability of the burst needle valve to some extent. To this end, the application provides a burst needle valve testing device and method.

[0006] The first aspect is to provide a blasting needle valve testing device, which is used for testing the sealing pressure value and the opening pressure value of the blasting needle valve.

[0007] A storage tank;

[0008] A first material conveying pipe and a first control valve group, one end of the first material conveying pipe is communicated with the storage tank, and the other end is used for being connected with a nitrogen source, the first control valve group is arranged on the first material conveying pipe, and under the condition that the first control valve group is opened, the first material conveying pipe conveys nitrogen into the storage tank to discharge air in the storage tank;

[0009] A second material conveying pipe and a second control valve group, one end of the second material conveying pipe is communicated with the storage tank, and the other end is used for being connected with a liquid nitrogen source, the second control valve group is arranged on the second material conveying pipe, and under the condition that the second control valve group is opened, the second material conveying pipe conveys liquid nitrogen into the storage tank to keep the testing temperature of the blasting needle valve testing device in a preset interval;

[0010] A third material conveying pipe, the third material conveying pipe has oppositely arranged input and output ends, the input end is communicated with the storage tank, and the blasting needle valve is arranged on the third material conveying pipe, so that the storage tank is communicated with the blasting needle valve through the third material conveying pipe;

[0011] A bubble detector, which is connected with the output end of the third material conveying pipe and is used for detecting the bubble amount of the output end of the third material conveying pipe;

[0012] A pressure detector, which is arranged on the third material conveying pipe and is used for detecting the pressure value in the third material conveying pipe;

[0013] Under the condition that the bubble amount is a first preset value, the pressure value detected by the pressure detector is the sealing pressure value of the blasting needle valve, under the condition that the bubble amount is a second preset value, the pressure value detected by the pressure detector is the opening pressure value of the blasting needle valve, and the first preset value is smaller than the second preset value.

[0014] In the embodiment, before the blasting needle valve is tested, liquid nitrogen is conveyed into the storage tank, the operating pressure of the storage tank is relatively low, the temperature of the liquid nitrogen in the storage tank is also low, generally between-181℃ and-176℃, the liquid nitrogen is evaporated into low-temperature nitrogen gas, and the low-temperature nitrogen gas can keep the temperature value of the whole blasting needle valve testing device in a low temperature interval (-150~-130℃) along the gas phase space of the storage tank and the outlet pipeline, so that the testing temperature of the blasting needle valve can be approximately the same as the actual working temperature, thereby improving the accuracy and reliability of the blasting needle valve testing.

[0015] In an alternative embodiment of the present application, the first control valve group comprises a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve connected in series, the first on-off valve is arranged close to the nitrogen source, the fourth on-off valve is arranged close to the storage tank, and when the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened, the first conveying pipe conveys nitrogen into the storage tank to discharge air in the storage tank.

[0016] In an alternative embodiment of the present application, the input end of the third conveying pipe is connected between the second on-off valve and the third on-off valve.

[0017] In an alternative embodiment of the present application, the burst needle valve testing device further comprises a first regulating valve connected in parallel with the burst needle valve, and when the first on-off valve, the second on-off valve and the first regulating valve are opened and the third on-off valve is closed, the third conveying pipe can be dried.

[0018] In an alternative embodiment of the present application, the burst needle valve testing device further comprises a first safety valve and a second regulating valve connected in parallel between the third on-off valve and the fourth on-off valve.

[0019] In an alternative embodiment of the present application, the second control valve group comprises a fifth on-off valve, a fifth regulating valve and a sixth on-off valve connected in series, the fifth on-off valve is arranged close to the storage tank, and the sixth on-off valve is arranged close to the liquid nitrogen source, and when the fifth on-off valve, the fifth regulating valve and the sixth on-off valve are opened, liquid nitrogen is input into the storage tank until the liquid level of the liquid nitrogen in the storage tank is greater than or equal to a preset height.

[0020] In an alternative embodiment of the present application, the second control valve group further comprises a second safety valve and a seventh on-off valve connected in parallel between the fifth regulating valve and the sixth on-off valve, and when the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened, the fifth on-off valve, the fifth regulating valve and the seventh on-off valve are opened to discharge air in the storage tank.

[0021] In an alternative embodiment of the present application, the burst disc valve testing device further comprises a fourth feed pipe, an air temperature vaporizer, a third regulating valve and a fourth regulating valve, the third regulating valve is connected in parallel with the fifth regulating valve, one end of the fourth feed pipe is connected between the fifth switch valve and the fifth regulating valve, and the other end of the fourth feed pipe extends into the storage tank, the air temperature vaporizer and the fourth regulating valve are arranged in sequence on the fourth feed pipe, and the fourth regulating valve is arranged close to the storage tank; after the air in the storage tank is exhausted, the sixth switch valve, the third regulating valve and the fourth regulating valve are opened, the fifth switch valve and the fifth regulating valve are closed, the air pressure in the storage tank is slowly increased, and the burst disc valve is cooled.

[0022] In an alternative embodiment of the present application, the burst disc valve testing device further comprises a pressure relief valve arranged between the fourth feed pipe and the fifth regulating valve.

[0023] In a second aspect, the embodiments of the present application provide a burst disc valve testing method applied to a burst disc valve testing device, the burst disc valve testing device comprising: a storage tank; a first feed pipe, a first control valve group, a second feed pipe, a second control valve group and a third feed pipe, one end of the first feed pipe being in communication with the storage tank, and the other end of the first feed pipe being used for connecting with a nitrogen source, and the first control valve group being arranged on the first feed pipe; one end of the second feed pipe being in communication with the storage tank, and the other end of the second feed pipe being used for connecting with a liquid nitrogen source, and the second control valve group being arranged on the second feed pipe, and the third feed pipe having an input end and an output end arranged oppositely, and the input end being in communication with the storage tank,

[0024] The burst disc valve testing method comprises:

[0025] controlling the first control valve group to be opened to introduce nitrogen into the storage tank to replace air in the storage tank;

[0026] controlling the second control valve group to be opened to introduce liquid nitrogen into the storage tank to keep the test temperature of the burst disc valve testing device within a preset interval;

[0027] controlling the second control valve group to be closed and controlling the third feed pipe to be in communication with the storage tank;

[0028] obtaining the bubble amount of the output end of the third feed pipe and the pressure value of the third feed pipe, under the condition that the bubble amount is a first preset value, the obtained pressure value is the sealing pressure value of the burst disc valve, and under the condition that the bubble amount is a second preset value, the obtained pressure value is the opening pressure value of the burst disc valve, and the first preset value is less than the second preset value.

[0029] The beneficial effects of the blasting needle valve testing method provided in the second aspect are the same as those of the blasting needle valve testing device provided in the first aspect, which will not be repeated here.

[0030] In the optional embodiment of the present application, the blasting needle valve testing device further comprises a fourth feed pipe, an air-temperature vaporizer, a third regulating valve and a fourth regulating valve, the third regulating valve is connected in parallel with the second control valve group, one end of the fourth feed pipe is connected to the first feed pipe, and the other end of the fourth feed pipe extends into the storage tank, the air-temperature vaporizer and the fourth regulating valve are sequentially arranged on the fourth feed pipe, and the fourth regulating valve is arranged close to the storage tank.

[0031] Before the step of controlling the second control valve group to be closed and controlling the third feed pipe to be in communication with the storage tank, the blasting needle valve testing method further comprises the steps of:

[0032] adjusting the opening degrees of the third regulating valve and the fourth regulating valve to slowly pressurize the storage tank and cool the blasting needle valve;

[0033] obtaining a cooling temperature value of the storage tank;

[0034] if the real-time temperature value of the storage tank is less than or equal to the cooling threshold value, controlling the third regulating valve and the fourth regulating valve to be closed and controlling the third feed pipe to be in conduction.

[0035] In the optional embodiment of the present application, while the step of obtaining the bubble amount of the output end of the third feed pipe and the pressure value of the third feed pipe, the blasting needle valve testing method further comprises the steps of:

[0036] increasing the opening degree of the fourth regulating valve to increase the air pressure of the storage tank.

[0037] In the optional embodiment of the present application, the blasting needle valve testing method further comprises the steps of:

[0038] controlling the first control valve group to be opened to make the blasting needle valve testing device to be warmed up and pressurized. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0040] Figure 1 The structure schematic diagram of the blasting needle valve testing device provided in the first embodiment of the present application is shown.

[0041] Figure 2 A partial structural view of a bursting needle valve testing device provided in the first embodiment of the present application is shown.

[0042] Figure 3 A partial structural view of a bursting needle valve testing device provided in the first embodiment of the present application is shown.

[0043] Figure 4 A flow chart of a bursting needle valve testing method provided in the second embodiment of the present application is shown.

[0044] Figure markings: 100-bursting needle valve testing device, 110-storage tank, 120-first feed pipe, 130-first control valve group, 131-first switch valve, 132-second switch valve, 133-third switch valve, 134-fourth switch valve, 140-second feed pipe, 150-second control valve group, 151-fifth switch valve, 152-fifth regulating valve, 153-sixth switch valve, 154-second safety valve, 155-seventh switch valve, 160-third feed pipe, 172-bubble detector, 174-pressure detector, 176-first regulating valve, 177-first safety valve, 178-second regulating valve, 181-fourth feed pipe, 182-air temperature vaporizer, 183-third regulating valve, 184-fourth regulating valve, 185-pressure relief valve, 200-bursting needle valve. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0047] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0048] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0049] The burst needle valve is applied to liquefied natural gas, ethylene, liquefied hydrocarbon receiving station, etc. A large amount of evaporation gas is generated during operation of the liquefied hydrocarbon. Under normal circumstances, the evaporation gas is recovered through the recondensation process to realize zero emission of the evaporation gas, avoid environmental pollution and greenhouse effect, but under abnormal circumstances, such as starting, stopping and overpressure accident, a part of the gas is discharged into the flare system. The evaporation gas is burned by the burner, which is also a typical processing and discharge process in the petroleum chemical industry and oil and gas storage and transportation industry.

[0050] The evaporation gas is mostly burned by the overhead flare or the ground flare. The ground flare is outstanding in small fireproof spacing, small radiation influence, small land occupation and small land acquisition pressure. The ground flare should be provided with a burst needle valve or a burst disc to realize intrinsic safety discharge. The burst needle valve becomes the first choice of the key components of the ground flare due to small set point deviation, high valve reliability, online recovery and other characteristics. The working principle of the burst needle valve is as follows: under normal working conditions, the medium pressure in the pipeline is lower than the set pressure, the burst needle is stable, and the burst needle type emergency pressure relief device is in the closed state. Under abnormal working conditions, the medium pressure in the pipeline reaches the set pressure, the burst needle is unstable, the burst needle type pressure relief device is instantaneously opened, and pressure relief is realized. According to the supply status of the burst needle valve, the supplier of the burst needle valve usually purchases the valve body of a mature supplier, designs the actuator and the pilot pressure taking point, and integrates the burst needle valve as a whole. After assembly is completed, the burst needle valve is subjected to normal temperature sealing test, low temperature sealing test and low temperature valve opening test.

[0051] The discharge temperature of most evaporation gas is-150℃ to-130℃. In order to ensure the mildness and accuracy of the burst needle valve to the actual operating environment, the test temperature should also be kept at-150℃ to-130℃. However, in the project implementation process, the low temperature sealing test device, low temperature opening test device, process and method of the burst needle valve lack the specification guidance in the industry, most of which cannot meet the test temperature of the application working condition of the burst needle valve, resulting in poor test accuracy and reliability of the burst needle valve, and even affecting the safety in the actual operation process.

[0052] The present application will be described below in conjunction with the drawings and with reference to specific embodiments:

[0053] First embodiment

[0054] Referring to Figure 1 The present embodiment provides a blasting needle valve testing device 100, the blasting needle valve testing device 100 provided by the present embodiment can improve the accuracy and reliability of the blasting needle valve 200 test.

[0055] The blasting needle valve testing device 100 provided by the present embodiment is mainly used for testing the sealing pressure value and the opening pressure value of the blasting needle valve 200. The sealing pressure value refers to the maximum pressure value that the blasting needle valve 200 can maintain good sealing. If the sealing pressure value is exceeded, the blasting needle valve 200 may leak. The opening pressure value refers to the pressure value that the blasting needle valve 200 bears when it is triggered to open. If the opening pressure value is exceeded, the blasting needle valve 200 is in an open state. The sealing pressure value is less than the opening pressure value.

[0056] In the present embodiment, the blasting needle valve testing device 100 comprises:

[0057] A storage tank 110;

[0058] A first material conveying pipe 120 and a first control valve group 130, one end of the first material conveying pipe 120 is in communication with the storage tank 110, and the other end is used for connecting with a nitrogen source. The first control valve group 130 is arranged on the first material conveying pipe 120. Under the condition that the first control valve group 130 is opened, the first material conveying pipe 120 conveys nitrogen to the storage tank 110 to discharge air in the storage tank 110;

[0059] A second material conveying pipe 140 and a second control valve group 150, one end of the second material conveying pipe 140 is in communication with the storage tank 110, and the other end is used for connecting with a liquid nitrogen source. The second control valve group 150 is arranged on the second material conveying pipe 140. Under the condition that the second control valve group 150 is opened, the second material conveying pipe 140 conveys liquid nitrogen to the storage tank 110 to keep the test temperature of the blasting needle testing device within a preset interval;

[0060] A third material conveying pipe 160, the third material conveying pipe 160 has an input end and an output end arranged oppositely, the input end is in communication with the storage tank 110, and the blasting needle valve 200 is arranged on the third material conveying pipe 160. The storage tank 110 is in communication with the blasting needle valve 200 through the third material conveying pipe 160;

[0061] A bubble detector 172 connected with the output end of the third material conveying pipe 160, used for detecting the amount of bubbles in the output end of the third material conveying pipe 160;

[0062] A pressure detector 174 arranged on the third material conveying pipe 160, used for detecting the pressure value in the third material conveying pipe 160;

[0063] Wherein, the pressure value detected by the pressure detector 174 is the sealing pressure value of the burst needle valve 200 when the bubble amount is the first preset value, and the pressure value detected by the pressure detector 174 is the opening pressure value of the burst needle valve 200 when the bubble amount is the second preset value, the first preset value is less than the second preset value.

[0064] In the embodiment, before the test of the burst needle valve 200 is performed, liquid nitrogen is delivered into the storage tank 110, and the temperature of the liquid nitrogen is low, between-181℃ and-176℃. The liquid nitrogen is introduced into the storage tank 110, so that the temperature value of the entire burst needle valve test device 100 can be kept in a low temperature range, and the test temperature of the burst needle valve 200 can be substantially the same as the actual working temperature, thereby improving the accuracy and reliability of the test of the burst needle valve 200. In a stable test environment, batch testing of the burst needle valve can be performed, and the economy is improved.

[0065] In the embodiment, the liquid nitrogen source can be a liquid nitrogen storage tank or a liquid nitrogen tank truck. The operating pressure is substantially 0.3MPaG-0.6MPaG, the operating temperature is-181℃ to-176℃, the maximum flow is 2t / h, the design temperature is-196℃ to 65℃, and the design pressure is 1.6MPaG. The set pressure of the safety valve of the upstream material feeding facility should be less than 1.6MPaG.

[0066] Under the initial working condition, the gas in the storage tank 110 is basically air. In order to ensure that the entire burst needle valve 200 system maintains a low temperature range without freezing, nitrogen is introduced into the storage tank 110 before the test to replace the air in the storage tank 110, so that the air in the entire burst needle valve test device 100 is replaced by nitrogen, and is always kept in a preset range. The nitrogen can be at room temperature, and the preset range is substantially 0℃ to 25℃.

[0067] After the air in the storage tank 110 is exhausted, liquid nitrogen is introduced into the storage tank 110 before the test of the burst needle valve 200, so that the test temperature in the entire burst needle valve 200 test system is kept in a preset range, thereby improving the test accuracy and reliability of the burst needle valve 200.

[0068] Please refer to Figure 2 and Figure 3In the embodiment, the first control valve group 130 includes a first switch valve 131, a second switch valve 132, a third switch valve 133 and a fourth switch valve 134 connected in series. The first switch valve 131 is arranged close to the nitrogen source, and the fourth switch valve 134 is arranged close to the storage tank 110. When the first switch valve 131, the second switch valve 132, the third switch valve 133 and the fourth switch valve 134 are all opened, the first delivery pipe 120 delivers nitrogen to the storage tank 110 to discharge the air in the storage tank 110.

[0069] The first switch valve 131, the second switch valve 132, the third switch valve 133 and the fourth switch valve 134 are connected in series. In the initial condition, the first switch valve 131, the second switch valve 132, the third switch valve 133 and the fourth switch valve 134 are opened first, so that nitrogen can enter the storage tank 110. Similarly, part of the structure of the second control valve group 150 is opened, so that the air in the storage tank 110 can be discharged to maintain the pressure balance in the storage tank 110.

[0070] In the embodiment, the input end of the third delivery pipe 160 is connected between the second switch valve 132 and the third switch valve 133.

[0071] That is, the third delivery pipe 160 is connected with the storage tank 110 through the first delivery pipe 120. Of course, in addition thereto, the third delivery pipe 160 can be directly connected with the storage tank 110.

[0072] In the embodiment, the burst needle valve testing device 100 further includes a first regulating valve 176 connected in parallel with the burst needle valve 200. When the first switch valve 131, the second switch valve 132 and the first regulating valve 176 are opened, and the third switch valve 133 is closed, the third delivery pipe 160 can be dried.

[0073] Before testing the burst needle valve 200, the third delivery pipe 160 needs to be dried. The first switch valve 131, the second switch valve 132 and the first regulating valve 176 can be opened, and the third switch valve 133 can be closed, so that the nitrogen source and the third delivery pipe 160 form a loop, nitrogen can enter the third delivery pipe 160, and the third delivery pipe 160 is dried, that is, the burst needle valve 200 is dried.

[0074] In the embodiment, the burst needle valve testing device 100 further includes a first safety valve 177 and a second regulating valve 178 connected in parallel between the third switch valve 133 and the fourth switch valve 134.

[0075] The second regulating valve 178 is connected in parallel with the first safety valve 177. After the dry blasting needle valve 200 is dry, the second regulating valve 178 is opened to keep the storage tank 110 in a slightly positive pressure state, i.e. the pressure in the storage tank 110 is less than or equal to 2 KPaG. Then the air pressure in the storage tank 110 is increased to test the blasting needle valve 200.

[0076] In the embodiment, the second control valve group 150 includes a fifth switch valve 151, a fifth regulating valve 152 and a sixth switch valve 153 connected in series. The fifth switch valve 151 is arranged close to the storage tank 110, and the sixth switch valve 153 is arranged close to the liquid nitrogen source. When the fifth switch valve 151, the fifth regulating valve 152 and the sixth switch valve 153 are opened, liquid nitrogen is input into the storage tank 110 until the liquid level of the liquid nitrogen in the storage tank 110 is greater than or equal to a preset height.

[0077] In the embodiment, the second control valve group 150 further includes a second safety valve 154 and a seventh switch valve 155 connected in parallel between the fifth regulating valve 152 and the sixth switch valve 153. When the first switch valve 131, the second switch valve 132, the third switch valve 133 and the fourth switch valve 134 are all opened, the fifth switch valve 151, the fifth regulating valve 152 and the seventh switch valve 155 are opened to discharge the air in the storage tank 110.

[0078] When the first switch valve 131, the second switch valve 132, the third switch valve 133 and the fourth switch valve 134 are opened, the fifth switch valve 151, the fifth regulating valve 152 and the seventh switch valve 155 are also opened. After the nitrogen in the nitrogen source enters the storage tank 110, the air in the storage tank 110 is discharged from the second material conveying pipe 140 to keep the pressure in the storage tank 110 balanced.

[0079] In the embodiment, the blasting needle valve testing device 100 further includes a fourth material conveying pipe 181, an air temperature vaporizer 182, a third regulating valve 183 and a fourth regulating valve 184. The third regulating valve 183 is connected in parallel with the fifth regulating valve 152. One end of the fourth material conveying pipe 181 is connected between the fifth switch valve 151 and the fifth regulating valve 152, and the other end extends into the storage tank 110. The air temperature vaporizer 182 and the fourth regulating valve 184 are arranged in sequence on the fourth material conveying pipe 181. The fourth regulating valve 184 is arranged close to the storage tank 110. After the air in the storage tank 110 is discharged, the sixth switch valve 153, the third regulating valve 183 and the fourth regulating valve 184 are opened, the fifth switch valve 151 and the fifth regulating valve 152 are closed, the air pressure in the storage tank 110 is slowly increased, and the blasting needle valve 200 is cooled.

[0080] After the nitrogen is replaced, the sixth switch valve 153, the third regulating valve 183, the fourth regulating valve 184, the fourth switch valve 134, and the second regulating valve 178 are opened, and the rest of the valves are all closed. The opening of the third regulating valve 183 and the fourth regulating valve 184 is adjusted to slowly introduce cold nitrogen into the storage tank 110 to pre-press the entire burst needle valve test device 100 and detect the air tightness of the entire burst needle valve test device 100. At the same time, the entire system is pre-cooled. After the pre-cooling is completed, the third regulating valve 183 and the fourth regulating valve 184 are closed, the fifth regulating valve 152 and the sixth switch valve 153 are opened, and liquid nitrogen is introduced into the storage tank 110. The liquid nitrogen enters the storage tank 110 through the second feed pipe 140. The temperature of the liquid nitrogen is relatively low, and the temperature of the entire burst needle valve test device 100 can be maintained within a preset interval by the liquid nitrogen, thereby improving the accuracy and reliability of the burst needle valve 200 test.

[0081] After the liquid nitrogen is filled, the burst needle valve 200 is installed, the third feed pipe 160 is dried, and all the valves are closed. The second regulating valve 178 is opened to maintain the operating pressure of the storage tank 110 to a slightly positive pressure state. After the pressure value in the storage tank 110 is less than or equal to 2 KPaG, the second regulating valve 178 is closed. The fourth switch valve 134 and the sixth switch valve 153 are opened, and the opening of the third regulating valve 183 and the fourth regulating valve 184 is adjusted to pressurize the storage tank 110. At the same time, the burst needle valve 200 is also cooled. The amount of bubbles downstream of the burst needle valve 200 is detected during the pressurization process to detect the sealing pressure value and the opening pressure value of the burst needle valve 200.

[0082] In this embodiment, the burst needle valve test device 100 further comprises a pressure relief valve 185 arranged between the fourth feed pipe 181 and the fifth regulating valve 152.

[0083] The working principle of the burst needle valve test device 100 provided in this embodiment is as follows: in the initial state, all the valves are closed. The first switch valve 131, the second switch valve 132, the third switch valve 133, the fourth switch valve 134, the fifth switch valve 151, the fifth regulating valve 152, and the seventh switch valve 155 are opened, and the rest of the valves are all closed. Nitrogen enters the storage tank 110 to replace the air in the storage tank 110. After the replacement is completed, all the valves are closed to maintain the stable operating pressure of the entire device.

[0084] After the nitrogen is replaced, the sixth switch valve 153, the third regulating valve 183, the fourth regulating valve 184, the fourth switch valve 134, and the second regulating valve 178 are opened, and the remaining valves are all closed. The opening of the third regulating valve 183 and the fourth regulating valve 184 is adjusted to slowly introduce cold nitrogen into the storage tank 110, slowly pressurize the entire burst needle valve test device 100, and detect the air tightness of the entire burst needle valve test device 100. At the same time, the entire system is pre-cooled. After the pre-cooling is completed, the third regulating valve 183 and the fourth regulating valve 184 are closed, the fifth regulating valve 152 and the sixth switch valve 153 are opened, and liquid nitrogen is introduced into the storage tank 110. The liquid nitrogen enters the storage tank 110 through the second feed pipe 140. The temperature of the liquid nitrogen is relatively low, the temperature in the entire burst needle valve test device 100 can be maintained within a preset interval through the liquid nitrogen, and the accuracy and reliability of the burst needle valve 200 test are improved.

[0085] After the liquid nitrogen is filled, the burst needle valve 200 is installed, the third feed pipe 160 is dried, and all the valves are closed. The second regulating valve 178 is opened to maintain the operating pressure of the storage tank 110 to a slightly positive pressure state. After the pressure value in the storage tank 110 is less than or equal to 2 KPaG, the second regulating valve 178 is closed. The fourth switch valve 134 and the sixth switch valve 153 are opened, and the opening of the third regulating valve 183 and the fourth regulating valve 184 is adjusted to pressurize the storage tank 110. At the same time, the burst needle valve 200 is also cooled. The amount of bubbles downstream of the burst needle valve 200 is detected during the pressurization process, and the sealing pressure value and the opening pressure value of the burst needle valve 200 are detected through the amount of bubbles.

[0086] After the nitrogen is replaced, the sixth switch valve 153, the third regulating valve 183, the fourth regulating valve 184, the fourth switch valve 134, and the second regulating valve 178 are opened, and the remaining valves are all closed. The opening of the third regulating valve 183 and the fourth regulating valve 184 is adjusted to slowly introduce cold nitrogen into the storage tank 110, slowly pressurize the entire burst needle valve test device 100, and detect the air tightness of the entire burst needle valve test device 100. At the same time, the entire system is pre-cooled. After the pre-cooling is completed, the third regulating valve 183 and the fourth regulating valve 184 are closed, the fifth regulating valve 152 and the sixth switch valve 153 are opened, and liquid nitrogen is introduced into the storage tank 110. The liquid nitrogen enters the storage tank 110 through the second feed pipe 140. The temperature of the liquid nitrogen is relatively low, the temperature in the entire burst needle valve test device 100 can be maintained within a preset interval through the liquid nitrogen, and the accuracy and reliability of the burst needle valve 200 test are improved.

[0087] After the liquid nitrogen is filled, the burst needle valve 200 is installed, the first switch valve 131, the second switch valve 132 and the first regulating valve 176 are opened, all the other valves are closed, the third material conveying pipe 160 is dried, and then all the valves are closed. The second regulating valve 178 is opened to maintain the operating pressure of the storage tank 110 to a slightly positive pressure state, and the second regulating valve 178 is closed when the pressure value in the storage tank 110 is less than or equal to 2 KPaG. The fourth switch valve 134 and the sixth switch valve 153 are opened, and the opening degrees of the third regulating valve 183 and the fourth regulating valve 184 are adjusted to pressurize the storage tank 110, and the burst needle valve 200 is cooled at the same time. The amount of bubbles downstream of the burst needle valve 200 is detected during the pressurization, and the sealing pressure value and the opening pressure value of the burst needle valve 200 are detected through the amount of bubbles.

[0088] In summary, the burst needle valve test device 100 provided in the embodiment can maintain the temperature value of the entire burst needle valve test device 100 in a low temperature range by supplying liquid nitrogen with a low temperature of-160℃ to-130℃ into the storage tank 110 before testing the burst needle valve 200, so that the test temperature of the burst needle valve 200 is approximately the same as the actual working temperature, thereby improving the accuracy and reliability of the burst needle valve 200 test.

[0089] Second Embodiment

[0090] Please refer to Figure 4 The burst needle valve test method provided in the embodiment can improve the accuracy and reliability of the burst needle valve 200 test.

[0091] The specific steps of the burst needle valve test method are as follows:

[0092] Step S10, the first control valve group 130 is controlled to be opened, and nitrogen gas is supplied into the storage tank 110 to replace the air in the storage tank 110.

[0093] In the initial state, all the valves are closed, the first switch valve 131, the second switch valve 132, the third switch valve 133, the fourth switch valve 134, the fifth switch valve 151, the fifth regulating valve 152 and the seventh switch valve 155 are opened, and the other valves are closed. Nitrogen gas enters the storage tank 110 to replace the air in the storage tank 110, and after replacement, all the valves are closed to maintain the operating pressure of the entire device stable.

[0094] Step S20, adjust the opening of the third regulating valve 183 and the fourth regulating valve 184, slowly increase the pressure of the storage tank 110, and cool the blasting needle valve test device 100.

[0095] After the nitrogen is replaced, the sixth switch valve 153, the third regulating valve 183, the fourth regulating valve 184, the fourth switch valve 134, and the second regulating valve 178 are opened, and the remaining valves are all closed. By adjusting the opening of the third regulating valve 183 and the fourth regulating valve 184, cold nitrogen can be slowly introduced into the storage tank 110 to pre-pressurize the entire blasting needle valve test device 100 and detect the air tightness of the entire blasting needle valve test device 100. At the same time, the entire system is cooled.

[0096] Step S30, obtain the cooling temperature value of the storage tank.

[0097] In this embodiment, during the process of introducing cold nitrogen into the storage tank, the entire system is pre-pressurized and pre-cooled. The cooling speed can be controlled by the cooling temperature value.

[0098] Step S40, if the real-time temperature value of the storage tank is less than or equal to the cooling threshold value, control the third regulating valve 183 and the fourth regulating valve 184 to be closed, and control the third feed pipe 160 to be turned on.

[0099] If the real-time temperature value is less than or equal to the cooling threshold value, it can be considered that the pre-cooling is completed.

[0100] Step S50, control the second control valve group 150 to be opened, and introduce liquid nitrogen into the storage tank 110 to maintain the test temperature of the blasting needle test device within a preset range.

[0101] After the cooling is completed, the third regulating valve 183 and the fourth regulating valve 184 are closed, the fifth regulating valve 152 and the sixth switch valve 153 are opened, and liquid nitrogen is introduced into the storage tank 110. The liquid nitrogen enters the storage tank 110 through the second feed pipe 140, and the temperature of the liquid nitrogen is relatively low. By using liquid nitrogen, the temperature of the entire blasting needle valve test device 100 can be maintained within a preset range, thereby improving the accuracy and reliability of the blasting needle valve 200 test.

[0102] Step S60, control the second control valve group 150 to be closed, and control the third feed pipe 160 to be in communication with the storage tank 110.

[0103] After the liquid nitrogen is filled, the blasting needle valve 200 is installed, the first switch valve 131, the second switch valve 132, and the first regulating valve 176 are opened, and the other valves are all closed. The third feed pipe 160 is dried, and then all the valves are closed.

[0104] Step S70, increase the opening of the fourth regulating valve 184 to increase the pressure of the storage tank 110.

[0105] The fourth switch valve 134 and the sixth switch valve 153 are opened again, and the opening degrees of the third regulating valve 183 and the fourth regulating valve 184 are adjusted to pressurize the storage tank 110, and at the same time, the burst needle valve 200 can be cooled.

[0106] In step S80, the bubble amount at the output end of the third feed pipe 160 and the pressure value of the third feed pipe 160 are obtained.

[0107] The pressure value obtained under the condition that the bubble amount is the first preset value is the sealing pressure value of the burst needle valve 200, and the pressure value obtained under the condition that the bubble amount is the second preset value is the opening pressure value of the burst needle valve 200, and the first preset value is less than the second preset value.

[0108] The bubble amount downstream of the burst needle valve 200 is detected during the pressurization, and the sealing pressure value and the opening pressure value of the burst needle valve 200 are detected through the bubble amount. The sealing pressure value refers to the maximum pressure value that the burst needle valve 200 can withstand, and if the sealing pressure value is exceeded, the burst needle valve 200 may leak. The opening pressure value refers to the pressure value that the burst needle valve 200 withstands when it fails, and if the opening pressure value is exceeded, the burst needle valve 200 is in an open state. The sealing pressure value is less than the opening pressure value.

[0109] In step S90, the first control valve group 130 is controlled to be opened, so that the burst needle valve testing device 100 is warmed up and pressurized.

[0110] After the test is completed, the entire device is controlled to be warmed up and pressurized.

[0111] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

Claims

1. A bursting needle valve testing device, characterized in that: Used to test the sealing pressure value and opening pressure value of the bursting needle valve, characterized in that the bursting needle valve testing device includes: Storage tanks; a first material delivery pipe and a first control valve group, wherein one end of the first material delivery pipe is connected to the material storage tank, and the other end is used to be connected to a nitrogen source; the first control valve group is arranged on the first material delivery pipe, and when the first control valve group is opened, the first material delivery pipe delivers nitrogen to the material storage tank to discharge air in the material storage tank; a second material delivery pipe and a second control valve group, wherein one end of the second material delivery pipe is connected to the material storage tank, and the other end is used to be connected to a liquid nitrogen source. The second control valve group is arranged on the second material delivery pipe. When the second control valve group is opened, the second material delivery pipe delivers liquid nitrogen to the material storage tank to keep the test temperature of the bursting needle valve testing device within a preset range; a third material delivery pipe, the third material delivery pipe having an input end and an output end oppositely disposed, the input end being communicated with the material storage tank, the bursting needle valve being disposed on the third material delivery pipe, and the material storage tank being communicated with the bursting needle valve via the third material delivery pipe; a bubble detector connected to the output end of the third material delivery pipe, and used to detect the amount of bubbles at the output end of the third material delivery pipe; a pressure detector, provided on the third material delivery pipe, for detecting a pressure value in the third material delivery pipe; Among them, under the condition that the bubble amount is a first preset value, the pressure value detected by the pressure detector is the sealing pressure value of the bursting needle valve, and under the condition that the bubble amount is a second preset value, the pressure value detected by the pressure detector is the opening pressure value of the bursting needle valve, and the first preset value is smaller than the second preset value.

2. The bursting needle valve testing device according to claim 1, characterized in that: The first control valve group includes a first on-off valve, a second on-off valve, a third on-off valve and a fourth on-off valve which are sequentially connected in series to the first feed pipe. The first on-off valve is arranged close to the nitrogen source, and the fourth on-off valve is arranged close to the storage tank. When the first on-off valve, the second on-off valve, the third on-off valve and the fourth on-off valve are all opened, the first feed pipe transports nitrogen into the storage tank to discharge the air in the storage tank.

3. The bursting needle valve testing device according to claim 2, characterized in that: An input end of the third material delivery pipe is connected between the second switch valve and the third switch valve.

4. The bursting needle valve testing device according to claim 3, characterized in that: The bursting needle valve testing device further includes a first regulating valve, which is connected in parallel with the bursting needle valve. When the first switch valve, the second switch valve, and the first regulating valve are opened and the third switch valve is closed, the third feed pipe can be dried.

5. The bursting needle valve testing device according to claim 3, characterized in that: The bursting needle valve testing device further includes a first safety valve and a second regulating valve, wherein the first safety valve and the second regulating valve are connected in parallel between the third switch valve and the fourth switch valve.

6. The bursting needle valve testing device according to claim 2, characterized in that: The second control valve group includes a fifth switch valve, a fifth regulating valve and a sixth switch valve connected in series in sequence. The fifth switch valve is arranged close to the storage tank, and the sixth switch valve is arranged close to the liquid nitrogen source. When the fifth switch valve, the fifth regulating valve and the sixth switch valve are opened, liquid nitrogen is input into the storage tank until the liquid level of the liquid nitrogen in the storage tank is greater than or equal to a preset height.

7. The bursting needle valve testing device according to claim 6, characterized in that: The second control valve group also includes a second safety valve and a seventh switch valve. The second safety valve and the seventh switch valve are connected in parallel between the fifth regulating valve and the sixth switch valve. When the first switch valve, the second switch valve, the third switch valve and the fourth switch valve are all opened, the fifth switch valve, the fifth regulating valve and the seventh switch valve are opened to discharge the air in the storage tank.

8. The bursting needle valve testing device according to claim 6, characterized in that: The bursting needle valve testing device also includes a fourth feed pipe, an air-temperature vaporizer, a third regulating valve and a fourth regulating valve. The third regulating valve is connected in parallel with the fifth regulating valve. One end of the fourth feed pipe is connected between the fifth switch valve and the fifth regulating valve, and the other end extends into the storage tank. The air-temperature vaporizer and the fourth regulating valve are sequentially arranged on the fourth feed pipe, and the fourth regulating valve is arranged close to the storage tank. After the air in the storage tank is exhausted, the sixth switch valve, the third regulating valve and the fourth regulating valve are opened, and the fifth switch valve and the fifth regulating valve are closed, slowly increasing the air pressure in the storage tank and cooling the bursting needle valve.

9. The bursting needle valve testing device according to claim 8, characterized in that: The bursting needle valve testing device further includes a pressure relief valve, which is arranged between the fourth material conveying pipe and the fifth regulating valve.

10. A method for testing a bursting needle valve, characterized in that: Applicable to a bursting needle valve test device, the bursting needle valve test device includes: a storage tank; a first delivery pipe, a first control valve group, a second delivery pipe, a second control valve group and a third delivery pipe, one end of the first delivery pipe is connected to the storage tank, and the other end is used to be connected to a nitrogen source, and the first control valve group is arranged on the first delivery pipe; one end of the second delivery pipe is connected to the storage tank, and the other end is used to be connected to a liquid nitrogen source, the second control valve group is arranged on the second delivery pipe, and the third delivery pipe has an input end and an output end arranged oppositely, and the input end is connected to the storage tank, The bursting needle valve testing method includes: Controlling the first control valve group to open, and introducing nitrogen into the storage tank to replace the air in the storage tank; Controlling the second control valve group to open and introducing liquid nitrogen into the storage tank to keep the test temperature of the bursting needle valve testing device within a preset range; Controlling the second control valve group to close, and controlling the third material delivery pipe to communicate with the material storage tank; Obtain the amount of bubbles at the output end of the third feed pipe and the pressure value of the third feed pipe. Under the condition that the amount of bubbles is a first preset value, the obtained pressure value is the sealing pressure value of the bursting needle valve. Under the condition that the amount of bubbles is a second preset value, the obtained pressure value is the opening pressure value of the bursting needle valve. The first preset value is less than the second preset value.

11. The bursting needle valve testing method according to claim 10, characterized in that: The bursting needle valve testing device further includes a fourth material delivery pipe, an air temperature vaporizer, a third regulating valve and a fourth regulating valve, wherein the third regulating valve is connected in parallel with the second control valve group, one end of the fourth material delivery pipe is connected to the first material delivery pipe, and the other end extends into the storage tank, the air temperature vaporizer and the fourth regulating valve are sequentially arranged on the fourth material delivery pipe, and the fourth regulating valve is arranged close to the storage tank; Before the step of controlling the second control valve group to close and controlling the third material delivery pipe to communicate with the material storage tank, the bursting needle valve testing method further includes: Adjusting the openings of the third regulating valve and the fourth regulating valve to slowly pressurize the storage tank and cool the bursting needle valve testing device; Obtaining the cooling temperature value of the storage tank; If the real-time temperature value of the storage tank is less than or equal to the cooling threshold, the third regulating valve and the fourth regulating valve are controlled to be closed, and the third material conveying pipe is controlled to be connected.

12. The bursting needle valve testing method according to claim 11, characterized in that: While obtaining the amount of bubbles at the output end of the third conveying pipe and the pressure value of the third conveying pipe, the bursting needle valve testing method further includes: The opening of the fourth regulating valve is increased to increase the gas pressure in the storage tank.

13. The bursting needle valve testing method according to claim 10, characterized in that: The steps of the bursting needle valve testing method also include: The first control valve group is controlled to open, so that the bursting needle valve testing device is reheated and pressurized.

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