Pump low-temperature testing device and process suitable for energy station

Abstract

The invention discloses a pump low-temperature testing device and process suitable for an energy station. Comprising a first energy medium storage tank; the first low-temperature low-pressure pump is connected with the first energy medium storage tank; the recondenser is connected with the first low-temperature low-pressure pump; the low-pressure compressor is connected with the first energy medium storage tank; an energy medium inlet of the waste cold heat exchanger is connected with an outlet of the low-pressure compressor; an energy medium outlet of the waste cold heat exchanger is connected with a gas-phase energy medium inlet of the recondenser; an inlet of the first low-temperature booster pump is connected with a liquid-phase energy medium outlet in the bottom of the recondenser; an inlet of the second low-temperature booster pump is connected with a liquid-phase energy medium outlet in the bottom of the recondenser; an energy medium inlet of the first supercondenser is connected with an outlet of the second low-temperature booster pump; and an energy medium outlet of the first supercondenser is connected with the recondenser. The device has the beneficial effects that the supercooling degree of an energy medium can be ensured, and the accuracy of a low-temperature test result of the booster pump can also be ensured.

Description

Technical Field

[0001] This invention relates to the field of new energy utilization technology, and in particular to a low-temperature testing device and process for pumps suitable for energy stations. Background Technology

[0002] In accordance with the requirements of the national green energy utilization policy, ensuring the safety and stability of green energy facilities is an important part of this policy.

[0003] Currently, the cryogenic performance of pumps at the energy station is tested through a platform established by the pump manufacturer. However, the test medium is inconsistent with the energy station's cryogenic medium. After conversion, the pump performance parameters are obtained, leading to several problems and potential operational risks in cryogenic pump operation. Specifically: The inconsistency in the cryogenic test medium reduces the accuracy of pump performance testing, impacting equipment and process safety; the current cryogenic testing process uses a medium under cryogenic saturation, posing potential safety risks; the energy station lacks a dedicated pump testing platform, making pump performance design comparisons impossible and hindering accurate understanding of pump performance parameters, resulting in inefficient operation; according to the current energy station process design, cryogenic testing of pumps generates a large amount of cryogenic gas, increasing the load on the steam treatment system and energy consumption; and the energy station's process design limits cryogenic pump testing to external output requirements, potentially impacting operations with significant external output.

[0004] Therefore, this invention proposes a pump cryogenic testing device suitable for energy stations, which effectively solves the problems of safety, stability and applicability in the current pump cryogenic testing process. Summary of the Invention

[0005] The purpose of this invention is to provide a low-temperature pump testing device suitable for energy stations, which includes a first energy medium storage tank, a first low-temperature low-pressure pump, a recondenser, a low-pressure compressor, a residual heat exchanger, a coil heat exchanger, a first low-temperature booster pump, a second low-temperature booster pump, and a first subcondenser. This device can ensure the subcooling of the energy medium, guarantee the accuracy of the low-temperature test results of the booster pump, and meet the external transmission requirements of the energy station.

[0006] To achieve the above objectives, the present invention adopts the following technical solution, including: The first energy medium storage tank is used to hold energy media; The first cryogenic low-pressure pump is installed inside the first energy medium storage tank and is immersed in the liquid energy medium; The recondenser has its first liquid phase energy medium inlet connected to the first cryogenic low-pressure pump; The low-pressure compressor has its inlet connected to the gas phase energy medium outlet of the first energy medium storage tank; The waste heat exchanger has its energy medium inlet connected to the outlet of the low-pressure compressor; the energy medium outlet of the waste heat exchanger is connected to the gas phase energy medium inlet of the recondenser. A coil heat exchanger is located below the recondenser; the lower end of the coil heat exchanger is connected to the first cryogenic medium pipeline, and the upper end of the coil heat exchanger is connected to the cryogenic medium inlet of the waste heat exchanger through the second cryogenic medium pipeline. The third cryogenic medium pipeline is connected to the cryogenic medium outlet of the residual heat exchanger. The inlet of the first cryogenic booster pump is connected to the liquid energy medium outlet at the bottom of the recondenser via a first branch; the outlet of the first cryogenic booster pump is connected to the downstream pipeline via a first external transmission pipeline; a first regulating valve is provided on the external transmission pipeline. The inlet of the second cryogenic booster pump is connected to the liquid energy medium outlet at the bottom of the recondenser via a second branch; a second regulating valve and a third regulating valve are connected in parallel on the second branch; The first sub-condenser has its tube-side energy medium inlet connected to the outlet of the second cryogenic booster pump; the tube-side energy medium outlet of the first sub-condenser is connected to the re-condenser. The fourth cryogenic medium pipeline is connected to the cryogenic medium inlet of the first subcondenser; The fifth cryogenic medium pipeline is connected at both ends to the cryogenic medium outlet of the first supercondenser and the cryogenic medium inlet of the residual heat exchanger, respectively.

[0007] Preferably, the outlet of the second cryogenic booster pump is connected to the energy medium inlet of the first supercondenser via a fifth pipeline, and a fourth regulating valve and a fifth regulating valve are provided in parallel on the fifth pipeline.

[0008] Preferably, the energy medium outlet of the first supercondenser is connected to the second liquid phase energy medium inlet and the third liquid phase energy medium inlet of the recondenser via a third branch and a fourth branch, respectively; a sixth regulating valve is provided on the third branch; a seventh regulating valve is provided on the fourth branch; the first cryogenic low-pressure pump is connected to the first liquid phase energy medium inlet of the recondenser via a first pipeline, and an eighth regulating valve is provided on the first pipeline. Preferably, it also includes: The pressure vessel of the recondenser is connected to the sixth regulating valve, the seventh regulating valve and the eighth regulating valve respectively.

[0009] Preferably, it also includes: A second energy medium storage tank is used to hold energy medium; the gaseous energy medium outlet of the second energy medium storage tank is connected to the inlet of the low-pressure compressor. The second cryogenic low-pressure pump is installed inside the second energy medium storage tank and is immersed in the liquid energy medium; The second sub-condenser has its tube-side energy medium inlet connected to the outlet of the second cryogenic low-pressure pump; the tube-side energy medium outlet of the second sub-condenser is connected to the energy medium inlet of the second energy medium storage tank. The sixth cryogenic medium pipeline is connected to the cryogenic medium inlet of the second subcondenser; The seventh cryogenic medium pipeline is connected at both ends to the cryogenic medium outlet of the second supercondenser and the cryogenic medium inlet of the residual heat exchanger, respectively.

[0010] Preferably, the outlet of the second cryogenic low-pressure pump is connected to the energy medium inlet of the second supercondenser via a seventh pipeline, and a ninth regulating valve and a tenth regulating valve are connected in parallel on the seventh pipeline.

[0011] Preferably, the energy medium is one or more of ethane, propane, LNG, ethylene, liquid ammonia, and liquid air; and the cryogenic medium is liquid nitrogen.

[0012] A low-temperature testing process for pumps suitable for energy stations, using the low-temperature testing device for pumps suitable for energy stations described in any of the above-mentioned embodiments, includes the following steps: S1. The gaseous energy medium in the first energy medium storage tank enters the re-condenser sequentially through the low-pressure compressor and the residual heat exchanger; the liquid energy medium in the first energy medium storage tank is transported to the re-condenser by the first low-temperature low-pressure pump; the gaseous energy medium and the liquid energy medium are mixed in the re-condenser, and the gaseous energy medium is condensed into the liquid energy medium. The liquid energy medium enters the lower part of the re-condenser, passes through the coil heat exchanger, and exchanges heat with the cryogenic medium to ensure that the subcooling degree of the energy medium at the outlet of the liquid energy medium of the re-condenser is not less than 3 degrees. S2. Part of the liquid energy medium from the liquid energy medium outlet at the bottom of the recondenser enters the first external transmission pipeline after passing through the first cryogenic booster pump, thus realizing external transmission. S3. Part of the liquid energy medium from the bottom of the recondenser enters the first sub-condenser after passing through the second cryogenic booster pump. In the first sub-condenser, it exchanges heat with the cryogenic medium and then returns to the recondenser.

[0013] Preferably, it also includes: The gaseous energy medium in the second energy medium storage tank passes through the low-pressure compressor and the residual heat exchanger before entering the re-condenser. The liquid energy medium in the second energy medium storage tank is transported to the second sub-condenser by the second low-temperature low-pressure pump. In the second sub-condenser, it exchanges heat with the cryogenic medium. After the heat exchange, the energy medium is in a subcooled state and then returns to the second energy medium storage tank.

[0014] The beneficial effects of this invention are that it can ensure the subcooling of the energy medium, guarantee the accuracy of the low-temperature test results of the booster pump, and meet the external transmission requirements of the energy station. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a low-temperature pump testing device suitable for energy stations according to the present invention. Detailed Implementation

[0016] The invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0017] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0018] like Figure 1 As shown, a low-temperature testing device for pumps in energy stations according to the present invention includes: The first energy medium storage tank 110 is used to store energy media; The first cryogenic low-pressure pump 111 is installed in the first energy medium storage tank 110 and is immersed in the liquid energy medium. The first liquid phase energy medium inlet of the recondenser 200 is connected to the first cryogenic low-pressure pump 111 through the first pipeline 701. The inlet of the low-pressure compressor 300 is connected to the gas phase energy medium outlet of the first energy medium storage tank 110 through the second pipeline 702; as a preferred embodiment, a first isolation valve 901 is provided on the second pipeline 702.

[0019] The energy medium inlet of the waste heat exchanger 400 is connected to the outlet of the low-pressure compressor 300 through the third pipeline 703; the energy medium outlet of the waste heat exchanger 400 is connected to the gas phase energy medium inlet of the recondenser 200 through the fourth pipeline 704. A coil heat exchanger 210 is disposed at the lower part of the recondenser 200; the lower end of the coil heat exchanger 210 is connected to the first cryogenic medium pipeline 705, and the upper end of the coil heat exchanger 210 is connected to the cryogenic medium inlet of the residual heat exchanger 400 through the second cryogenic medium pipeline 706; the first cryogenic medium pipeline 705 is used to input liquid-phase cryogenic medium into the coil heat exchanger 210; the second cryogenic medium pipeline 706 is used to output gas-phase cryogenic medium from the coil heat exchanger 210; as a preferred embodiment, a fourth isolation valve 904 is provided on the second cryogenic medium pipeline 706.

[0020] The third cryogenic medium pipeline 707 is connected to the cryogenic medium outlet of the waste heat exchanger 400; the third cryogenic medium pipeline 707 is used to vent the gaseous shallow cryogenic medium in the waste heat exchanger 400. The inlet of the first cryogenic booster pump 510 is connected to the liquid phase energy medium outlet at the bottom of the recondenser 200 via the first branch 708; the outlet of the first cryogenic booster pump 510 is connected to the downstream pipeline via the first external transmission pipeline 709; a first regulating valve 801 is provided on the external transmission pipeline; as a preferred embodiment, a second isolation valve 902 is provided on the first branch 708.

[0021] The inlet of the second cryogenic booster pump 520 is connected to the liquid phase energy medium outlet at the bottom of the recondenser 200 through the second branch 710; a second regulating valve 802 and a third regulating valve 803 are provided in parallel on the second branch 710. The first subcondenser 610 has its tube-side energy medium inlet connected to the outlet of the second cryogenic booster pump 520 via the fifth pipe 711; the tube-side energy medium outlet of the first subcondenser 610 is connected to the recondenser 200 via the third branch 712 and the fourth branch 713 respectively; a third isolation valve 903 is provided on the fifth pipe 711.

[0022] The fourth cryogenic medium pipeline 714 is connected to the cryogenic medium inlet of the first supercondenser 610; The fifth cryogenic medium pipeline 715 is connected at both ends to the cryogenic medium outlet of the first supercondenser 610 and the cryogenic medium inlet of the residual heat exchanger 400, respectively. Preferably, a fifth isolation valve 905 is provided on the fifth cryogenic medium pipeline 715.

[0023] In another embodiment, the outlet of the second cryogenic booster pump 520 is connected to the energy medium inlet of the first supercondenser 610 via a fifth pipeline 711, and a fourth regulating valve 804 and a fifth regulating valve 805 are provided in parallel on the fifth pipeline 711.

[0024] In another embodiment, the energy medium outlet of the first supercondenser 610 is connected to the second liquid phase energy medium inlet and the third liquid phase energy medium inlet of the recondenser 200 via the third branch 712 and the fourth branch 713, respectively; a sixth regulating valve 806 is provided on the third branch 712; a seventh regulating valve 807 is provided on the fourth branch 713; the first cryogenic low-pressure pump 111 is connected to the first liquid phase energy medium inlet of the recondenser 200 via the first pipeline 701, and an eighth regulating valve 808 is provided on the first pipeline 701.

[0025] In another embodiment, it also includes a pressure vessel 220 for a recondenser, which is connected to the sixth regulating valve 806, the seventh regulating valve 807 and the eighth regulating valve 808, respectively.

[0026] In another embodiment, it further includes: a second energy medium storage tank 120 for containing the energy medium; the gaseous energy medium outlet of the second energy medium storage tank 120 is connected to the inlet of the low-pressure compressor 300 via a sixth pipeline 716; a second cryogenic low-pressure pump 121, which is installed inside the second energy medium storage tank 120 and immersed in the liquid energy medium; a second supercondenser 620, the tube-side energy medium inlet of which is connected to the outlet of the second cryogenic low-pressure pump 121 via a seventh pipeline 717; and the tube-side energy medium outlet of the second supercondenser 620. The sixth cryogenic medium pipeline 719 is connected to the energy medium inlet of the second energy medium storage tank via an eighth pipeline 718; the sixth cryogenic medium pipeline 719 is connected to the cryogenic medium inlet of the second subcondenser 620; the sixth cryogenic medium pipeline 719 is used to input liquid-phase cryogenic medium into the second subcondenser 620; the seventh cryogenic medium pipeline 720 is connected at both ends to the cryogenic medium outlet of the second subcondenser 620 and the cryogenic medium inlet of the waste heat exchanger 400, respectively; the seventh cryogenic medium pipeline 720 is used to output gaseous-phase cryogenic medium from the second subcondenser 620. Preferably, a sixth isolation valve 906 is provided on the sixth pipeline 716. A seventh isolation valve 907 is provided on the seventh pipeline 717. An eighth isolation valve 908 is provided on the seventh cryogenic medium pipeline 720.

[0027] In another embodiment, the outlet of the second cryogenic low-pressure pump 121 is connected to the energy medium inlet of the second supercondenser 620 via a seventh pipeline 717, and a ninth regulating valve 809 and a tenth regulating valve 810 are connected in parallel on the seventh pipeline 717.

[0028] In another embodiment, the energy medium is one or more of ethane, propane, LNG, ethylene, liquid ammonia, and liquid air; the cryogenic medium is liquid nitrogen.

[0029] A low-temperature testing process for pumps suitable for energy stations, using the low-temperature testing device for pumps suitable for energy stations described in any of the above-mentioned embodiments, includes the following steps: S1. The gaseous energy medium in the first energy medium storage tank 110 enters the re-condenser 200 through the low-pressure compressor 300 and the residual heat exchanger 400 in sequence; the liquid energy medium in the first energy medium storage tank 110 is transported to the re-condenser 200 by the first low-temperature low-pressure pump 111; the gaseous energy medium and the liquid energy medium are mixed in the re-condenser 200, and the gaseous energy medium is condensed into a liquid energy medium. The liquid energy medium enters the lower part of the re-condenser 200, and exchanges heat with the cryogenic medium through the coil heat exchanger 210 to ensure that the subcooling degree of the energy medium at the liquid energy medium outlet of the re-condenser 200 is not less than 3 degrees. S2. Part of the liquid energy medium from the liquid energy medium outlet at the bottom of the recondenser 200 enters the first external transmission pipeline 709 after passing through the first cryogenic booster pump 510, and is then transmitted externally. S3. Part of the liquid energy medium from the bottom of the recondenser 200 enters the first sub-condenser 610 after passing through the second cryogenic booster pump 520. After heat exchange with the cryogenic medium in the first sub-condenser 610, it returns to the recondenser 200.

[0030] In another embodiment, it also includes: The gaseous energy medium in the second energy medium storage tank 120 sequentially enters the re-condenser 200 through the low-pressure compressor 300 and the residual heat exchanger 400; the liquid energy medium in the second energy medium storage tank 120 is transported to the second sub-condenser 620 by the second low-temperature low-pressure pump 121, where it exchanges heat with the cryogenic medium. After the heat exchange, the energy medium is in a subcooled state and then returns to the second energy medium storage tank 120.

[0031] In summary, the present invention provides a pump cryogenic testing device suitable for energy stations, which can ensure the subcooling of the energy medium, guarantee the accuracy of the cryogenic test results of the booster pump, and meet the external transmission requirements of the energy station.

[0032] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A low-temperature testing device for pumps suitable for energy stations, characterized in that, include: The first energy medium storage tank is used to hold energy media; The first cryogenic low-pressure pump is installed inside the first energy medium storage tank and is immersed in the liquid energy medium; The recondenser has its first liquid phase energy medium inlet connected to the first cryogenic low-pressure pump; The low-pressure compressor has its inlet connected to the gas phase energy medium outlet of the first energy medium storage tank; The waste heat exchanger has its energy medium inlet connected to the outlet of the low-pressure compressor; the energy medium outlet of the waste heat exchanger is connected to the gas phase energy medium inlet of the recondenser. A coil heat exchanger is located below the recondenser; the lower end of the coil heat exchanger is connected to the first cryogenic medium pipeline, and the upper end of the coil heat exchanger is connected to the cryogenic medium inlet of the waste heat exchanger through the second cryogenic medium pipeline. The third cryogenic medium pipeline is connected to the cryogenic medium outlet of the residual heat exchanger. The inlet of the first cryogenic booster pump is connected to the liquid energy medium outlet at the bottom of the recondenser via a first branch; the outlet of the first cryogenic booster pump is connected to the downstream pipeline via a first external transmission pipeline; a first regulating valve is provided on the external transmission pipeline. The inlet of the second cryogenic booster pump is connected to the liquid energy medium outlet at the bottom of the recondenser via a second branch; a second regulating valve and a third regulating valve are connected in parallel on the second branch; The first sub-condenser has its tube-side energy medium inlet connected to the outlet of the second cryogenic booster pump; the tube-side energy medium outlet of the first sub-condenser is connected to the re-condenser. The fourth cryogenic medium pipeline is connected to the cryogenic medium inlet of the first subcondenser; The fifth cryogenic medium pipeline is connected at both ends to the cryogenic medium outlet of the first supercondenser and the cryogenic medium inlet of the residual heat exchanger, respectively.

2. The low-temperature testing device for pumps in energy stations according to claim 1, characterized in that: The outlet of the second cryogenic booster pump is connected to the energy medium inlet of the first supercondenser through a fifth pipeline, and a fourth regulating valve and a fifth regulating valve are provided in parallel on the fifth pipeline.

3. The low-temperature testing device for pumps in energy stations according to claim 2, characterized in that: The energy medium outlet of the first supercondenser is connected to the second liquid phase energy medium inlet and the third liquid phase energy medium inlet of the recondenser through the third branch and the fourth branch, respectively; a sixth regulating valve is provided on the third branch; a seventh regulating valve is provided on the fourth branch; the first cryogenic low-pressure pump is connected to the first liquid phase energy medium inlet of the recondenser through the first pipeline, and an eighth regulating valve is provided on the first pipeline.

4. The low-temperature testing device for pumps in energy stations according to claim 3, characterized in that, Also includes: The pressure vessel of the recondenser is connected to the sixth regulating valve, the seventh regulating valve and the eighth regulating valve respectively.

5. The low-temperature testing device for pumps in energy stations according to claim 2, characterized in that, Also includes: The second energy medium storage tank is used to hold energy media; The gaseous energy medium outlet of the second energy medium storage tank is connected to the inlet of the low-pressure compressor; The second cryogenic low-pressure pump is installed inside the second energy medium storage tank and is immersed in the liquid energy medium; The second sub-condenser has its tube-side energy medium inlet connected to the outlet of the second cryogenic low-pressure pump; the tube-side energy medium outlet of the second sub-condenser is connected to the energy medium inlet of the second energy medium storage tank. The sixth cryogenic medium pipeline is connected to the cryogenic medium inlet of the second subcondenser; The seventh cryogenic medium pipeline is connected at both ends to the cryogenic medium outlet of the second supercondenser and the cryogenic medium inlet of the residual heat exchanger, respectively.

6. The low-temperature testing device for pumps in energy stations according to claim 5, characterized in that: The outlet of the second cryogenic low-pressure pump is connected to the energy medium inlet of the second supercondenser through the seventh pipeline, and the ninth regulating valve and the tenth regulating valve are connected in parallel on the seventh pipeline.

7. The low-temperature testing device for pumps in energy stations according to claim 5, characterized in that: The energy medium is one or more of ethane, propane, LNG, ethylene, liquid ammonia, and liquid air; the cryogenic medium is liquid nitrogen.

8. A pump cryogenic testing process suitable for energy stations, employing the pump cryogenic testing device for energy stations as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. The gaseous energy medium in the first energy medium storage tank passes through the low-pressure compressor and the waste heat exchanger in sequence and enters the re-condenser. The liquid energy medium in the first energy medium storage tank is transported to the recondenser by the first cryogenic low-pressure pump. The gaseous energy medium and the liquid energy medium are mixed in the re-condenser, and the gaseous energy medium is condensed into the liquid energy medium. The liquid energy medium enters the lower part of the re-condenser, passes through the coil heat exchanger, and exchanges heat with the cryogenic medium to ensure that the subcooling degree of the energy medium at the outlet of the liquid energy medium of the re-condenser is not less than 3 degrees. S2. Part of the liquid energy medium from the liquid energy medium outlet at the bottom of the recondenser enters the first external transmission pipeline after passing through the first cryogenic booster pump, thus realizing external transmission. S3. Part of the liquid energy medium from the bottom of the recondenser enters the first sub-condenser after passing through the second cryogenic booster pump. In the first sub-condenser, it exchanges heat with the cryogenic medium and then returns to the recondenser.

9. The low-temperature testing process for pumps in energy stations according to claim 8, characterized in that, Also includes: The gaseous energy medium in the second energy medium storage tank passes through the low-pressure compressor and the waste heat exchanger in sequence before entering the re-condenser. The liquid energy medium in the second energy medium storage tank is transported to the second subcondenser by the second cryogenic low-pressure pump. In the second subcondenser, it exchanges heat with the cryogenic medium. After the heat exchange, the energy medium is in a subcooled state and then returns to the second energy medium storage tank.

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