High-pressure low-temperature medium flow measuring system

Abstract

The utility model discloses a high-pressure low-temperature medium flow measuring system, which relates to the technical field of LNG (liquefied natural gas) low-temperature pump testing and comprises an LNG circulating tank, a testing pump pool, a first flow final execution element, a first flow transmitter, a second flow final execution element, a first pressure transmitter and a flow measuring process pipeline. A first flow final execution element and a first flow transmitter are jointly debugged and are respectively arranged on a liquid inlet pipeline, and a second flow final execution element and a first pressure transmitter are jointly debugged and are respectively arranged between the LNG circulation tank and the test pump pool. LNG is discharged from the test pump pool, depressurized and throttled through the flow measurement process pipeline and then returns to the LNG circulation tank. The system can measure the flow and pressure of each process pipeline, ensures smooth proceeding of an LNG test, can select a flow measurement process pipeline in a proper flow range according to the flow and lift of the pump, and is high in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to LNG low temperature pump test technical field especially relates to high pressure low temperature medium flow measuring system. BACKGROUND

[0002] In recent years, the position of natural gas in energy supply is more and more important, and the demand increases greatly. LNG (i.e. liquefied natural gas, English full name for Liquefied Natural Gas) point supply as an important natural gas supply mode, also has been widely applied. In the LNG low temperature pump test system, in order to ensure that LNG test is carried out smoothly, the flow of each process pipeline in the test system needs to be measured or regulated.

[0003] Therefore, it is necessary to design a high pressure low temperature medium flow measuring system, which can measure the flow of each process pipeline and ensure that LNG test is carried out smoothly. UTILITY MODEL CONTENT

[0004] In view of the above-mentioned deficiencies existing at present, the utility model provides high pressure low temperature medium flow measuring system, can measure and control the flow and pressure of each process pipeline, ensure that LNG test is carried out smoothly, convenient to use, can select the flow measuring process pipeline of appropriate flow range according to the flow and lift of pump, measure pump outlet flow, more wide range of application, stronger applicability.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model adopts the following technical scheme:

[0006] High pressure low temperature medium flow measuring system, including LNG circulating tank, test pump pool, LNG enters LNG circulating tank through liquid inlet pipeline, then enters test pump pool from LNG circulating tank, the high pressure low temperature medium flow measuring system still includes first flow final actuator, first flow transmitter, second flow final actuator, first pressure transmitter, flow measuring process pipeline, the first flow final actuator is connected with first flow transmitter and is respectively arranged on liquid inlet pipeline, the second flow final actuator is connected with first pressure transmitter and is respectively arranged between LNG circulating tank and test pump pool, LNG is discharged from test pump pool and passes through flow measuring process pipeline pressure reducing throttle and then returns LNG circulating tank.

[0007] According to one aspect of the utility model, the flow measuring process pipeline is divided into three ways, and the flow ranges of the three flow measuring process pipelines are different.

[0008] According to one aspect of the utility model, the flow ranges of the three flow measuring process pipelines are 50m 3 / h~500m 3 / h, 120m 3 / h~1200m 3 / h、250m 3 / h~2500m 3 / h。

[0009] According to one aspect of the utility model, second pressure transmitter, second flow transmitter, pressure final actuator are sequentially arranged on each flow measurement process pipeline, and the three are set in combination.

[0010] According to one aspect of the utility model, pressure control indicator and second flow indicator are further arranged on each flow measurement process pipeline, the pressure control indicator is connected with the second pressure transmitter, and the second flow indicator is connected with the second flow transmitter.

[0011] According to one aspect of the utility model, first flow indicator is further arranged on the liquid inlet pipeline, and the first flow final actuator, the first flow transmitter and the first flow indicator are set in combination.

[0012] The utility model discloses the advantages of implementation: LNG enters LNG circulating tank through liquid inlet pipeline, then enters test pump pool through process pipeline from LNG circulating tank, then is discharged from test pump pool through liquid outlet pipe, after pressure reduction throttling through flow measurement process pipeline, returns to LNG circulating tank again, forms circulating system. Through the first flow final actuator, the first flow transmitter, the first flow indicator, the second flow final actuator, the first pressure transmitter, flow measurement process pipeline etc. are set, the system can measure and control the flow and pressure of each process pipeline, guarantees that LNG test carries out smoothly, and convenient to use. Through the flow measurement process pipeline is divided into three ways, the system can select the flow measurement process pipeline of suitable flow range according to the flow and lift of pump, measures test pump outlet flow, and the scope of application is wider, and the applicability is stronger. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings according to these drawings without creating creative labor.

[0014] Figure 1 It is the connection principle schematic diagram of the utility model.

[0015] The name corresponding to the serial number in the drawing is as follows:

[0016] 1. Liquid inlet pipeline; 2. LNG circulation tank; 3. Test pump pool; 4. Flow measurement process pipeline; 41. Second pressure transmitter; 42. Pressure control indication; 43. Second flow indication; 44. Second flow transmitter; 45. Pressure final actuator; 5. First flow final actuator; 6. First flow transmitter; 7. First flow indication; 8. Second flow final actuator; 9. First pressure transmitter. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] Example 1

[0019] like Figure 1 As shown, the high-pressure cryogenic medium flow measurement system is used in the LNG cryogenic pump test system to measure the flow of each process pipeline and ensure the smooth progress of the LNG test. The high-pressure cryogenic medium flow measurement system includes an LNG circulation tank 2, a test pump pool 3, a first flow final actuator 5, a first flow transmitter 6, a first flow indicator 7, a second flow final actuator 8, a first pressure transmitter 9, and a flow measurement process pipeline 4. LNG enters the LNG circulation tank 2 through the liquid inlet pipeline 1, then enters the test pump pool 3 from the LNG circulation tank 2 through the process pipeline. After being discharged from the test pump pool 3 through the liquid outlet pipe, it is reduced in pressure and throttled through the flow measurement process pipeline 4 and then returns to the LNG circulation tank 2, forming a circulation system. The first flow final actuator 5, the first flow transmitter 6, and the first flow indicator 7 are configured in conjunction with each other and are respectively arranged on the liquid inlet pipeline 1 to control the liquid inlet flow so that the LNG flow meets the test requirements. The second flow final actuator 8 is configured in conjunction with the first pressure transmitter 9 and is respectively arranged on the process pipeline between the LNG circulation tank 2 and the test pump pool 3 to ensure that the liquid inlet speed of the test pump pool 3 meets the requirements. The flow measurement process pipeline 4 is provided with a second pressure transmitter 41, a pressure control indicator 42, a second flow indicator 43, a second flow transmitter 44, and a pressure final actuator 45, which are configured in conjunction with each other. The second pressure transmitter 41, the second flow transmitter 44, and the pressure final actuator 45 are sequentially arranged according to the flow direction of the LNG medium. The pressure control indicator 42 is connected to the second pressure transmitter 41, and the second flow indicator 43 is connected to the second flow transmitter 44. The flow measurement process pipeline 4 is used to reduce the pressure and throttle the LNG at the pump pool outlet.

[0020] In this embodiment, the first flow final actuator 5 and the second flow final actuator 8 are regulating valves of different specifications, and the first flow transmitter 6 and the second flow transmitter 44 are flow meters of different specifications.

[0021] The beneficial effects of this embodiment are: through the settings of the first flow final actuator 5, the first flow transmitter 6, the first flow indicator 7, the second flow final actuator 8, the first pressure transmitter 9, the flow measurement process pipeline 4, etc., this system can measure and control the flow and pressure of each process pipeline, ensure the smooth progress of the LNG test, and be easy to use.

[0022] Example 2

[0023] like Figure 1 As shown, the high-pressure cryogenic medium flow measurement system is used in the LNG cryogenic pump test system to measure the flow of each process pipeline and ensure the smooth progress of the LNG test. The high-pressure cryogenic medium flow measurement system includes an LNG circulation tank 2, a test pump pool 3, a first flow final actuator 5, a first flow transmitter 6, a first flow indicator 7, a second flow final actuator 8, a first pressure transmitter 9, and a flow measurement process pipeline 4. LNG enters the LNG circulation tank 2 through the liquid inlet pipeline 1, then enters the test pump pool 3 from the LNG circulation tank 2 through the process pipeline. After being discharged from the test pump pool 3 through the liquid outlet pipe, it is reduced in pressure and throttled through the flow measurement process pipeline 4 and then returns to the LNG circulation tank 2, forming a circulation system. The first flow final actuator 5, the first flow transmitter 6, and the first flow indicator 7 are configured in conjunction with each other and are respectively arranged on the liquid inlet pipeline 1 to control the liquid inlet flow so that the LNG flow meets the test requirements. The second flow final actuator 8 is set in conjunction with the first pressure transmitter 9 and is respectively set on the process pipeline between the LNG circulation tank 2 and the test pump pool 3 to ensure that the liquid inlet speed of the test pump pool 3 meets the requirements. The flow measurement process pipeline 4 is divided into three paths, and the flow ranges of the three flow measurement process pipelines 4 are different. The flow ranges of the three flow measurement process pipelines 4 are 50m 3 / h~500m 3 / h、120m 3 / h~1200m 3 / h、250m 3 / h~2500m 3The test system can select the flow measuring process pipeline 4 of a proper flow range according to the flow and head of the pump to measure the outlet flow of the test pump, each flow measuring process pipeline 4 is provided with a second pressure transmitter 41, a pressure control indicator 42, a second flow indicator 43, a second flow transmitter 44 and a pressure final control element 45 which are connected and set with each other, the second pressure transmitter 41, the second flow transmitter 44 and the pressure final control element 45 are sequentially arranged according to the flow direction of the LNG medium, the pressure control indicator 42 is connected with the second pressure transmitter 41, and the second flow indicator 43 is connected with the second flow transmitter 44, and the flow measuring process pipeline 4 is used to depressurize and throttle the LNG at the outlet of the pump pool.

[0024] In the embodiment, the first flow final control element 5 and the second flow final control element 8 are selected as regulating valves of different specifications, and the first flow transmitter 6 and the second flow transmitter 44 are selected as flow meters of different specifications.

[0025] The embodiment has the beneficial effects that: through the first flow final control element 5, the first flow transmitter 6, the first flow indicator 7, the second flow final control element 8, the first pressure transmitter 9 and the flow measuring process pipeline 4, the system can measure and control the flow and pressure of each process pipeline, ensure the smooth LNG test and be convenient to use. The flow measuring process pipeline 4 is divided into three parts, the system can select the flow measuring process pipeline 4 of a proper flow range according to the flow and head of the pump to measure the outlet flow of the test pump, and the system has a wider application range and stronger applicability.

[0026] The above merely describes the specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can easily think of the changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be subject to the protection scope of the claims.

Claims

1. A high-pressure, low-temperature medium flow measurement system, comprising an LNG circulation tank (2) and a test pump pool (3), wherein LNG enters the LNG circulation tank (2) through a liquid inlet pipeline (1) and then enters the test pump pool (3) from the LNG circulation tank (2), and is characterized in that: The high-pressure, low-temperature medium flow measurement system further comprises a first flow final actuator (5), a first flow transmitter (6), a second flow final actuator (8), a first pressure transmitter (9), and a flow measurement process pipeline (4); the first flow final actuator (5) and the first flow transmitter (6) are coordinated and respectively arranged on the liquid inlet pipeline (1); the second flow final actuator (8) and the first pressure transmitter (9) are coordinated and respectively arranged between the LNG circulation tank (2) and the test pump pool (3); after being discharged from the test pump pool (3), the LNG passes through the flow measurement process pipeline (4), is pressure-reduced and throttled, and then returns to the LNG circulation tank (2).

2. The high-pressure and low-temperature medium flow measurement system according to claim 1, characterized in that: The flow measurement process pipeline (4) is divided into three paths, and the flow ranges of the three flow measurement process pipelines (4) are different.

3. The high-pressure and low-temperature medium flow measurement system according to claim 2, characterized in that: The flow ranges of the three-way flow measurement process pipeline (4) are 50m 3 / h~500m 3 / h、120m 3 / h~1200m 3 / h、250m 3 / h~2500m 3 / h.

4. The high-pressure and low-temperature medium flow measurement system according to claim 2, characterized in that: Each flow measurement process pipeline (4) is sequentially provided with a second pressure transmitter (41), a second flow transmitter (44), and a pressure final actuator (45), and the three are arranged in a coordinated manner.

5. The high-pressure and low-temperature medium flow measurement system according to claim 4, characterized in that: Each flow measurement process pipeline (4) is also provided with a pressure control indicator (42) and a second flow indicator (43). The pressure control indicator (42) is connected to the second pressure transmitter (41), and the second flow indicator (43) is connected to the second flow transmitter (44).

6. The high-pressure and low-temperature medium flow measurement system according to claim 1, characterized in that: The liquid inlet pipeline (1) is also provided with a first flow indicator (7), and the first flow final actuator (5), the first flow transmitter (6), and the first flow indicator (7) are arranged in a coordinated manner.

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