CN114061999A - High-efficiency compact heat exchanger testing device and testing method thereof - Google Patents
High-efficiency compact heat exchanger testing device and testing method thereof Download PDFInfo
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- CN114061999A CN114061999A CN202111338933.8A CN202111338933A CN114061999A CN 114061999 A CN114061999 A CN 114061999A CN 202111338933 A CN202111338933 A CN 202111338933A CN 114061999 A CN114061999 A CN 114061999A
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- 238000012360 testing method Methods 0.000 title claims abstract description 85
- 238000012544 monitoring process Methods 0.000 claims abstract description 44
- 238000003860 storage Methods 0.000 claims description 40
- 238000007667 floating Methods 0.000 claims description 39
- 238000002955 isolation Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 6
- 238000010926 purge Methods 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 239000003949 liquefied natural gas Substances 0.000 description 35
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 239000003345 natural gas Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000002309 gasification Methods 0.000 description 3
- 238000007689 inspection Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- -1 steam Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
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Abstract
The invention discloses a high-efficiency compact heat exchanger testing device and a testing method thereof. According to the invention, the heat source system, the cold source system, the measuring system and the monitoring system are assembled in the skid-mounted box body to form a movable skid-mounted module, and four hose connecting interfaces connected with the FSRU are reserved on the skid-mounted module. When the heat exchange performance of the heat exchanger is tested, only the skid-mounted module is connected with the FSRU, so that the field workload and the installation time are greatly saved, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of ship construction, in particular to a high-efficiency compact heat exchanger testing device and a testing method thereof.
Background
With the increase of global natural gas demand and the development of the liquefied natural gas industry chain, offshore LNG Floating Storage and Regasification Units (FSRUs) are gradually emerging and become an important development direction in the energy field of China, and a heat exchanger is a core technical part of the FSRU unit. The printed circuit board type heat exchanger (PCHE) has the characteristics of compactness, high efficiency, reliability and the like as a novel micro-channel heat exchanger, can meet the requirements of a main low-temperature heat exchanger for offshore floating Liquefied Natural Gas (LNG) regasification, and gradually becomes one of potential options of the main low-temperature heat exchanger for offshore floating LNG gasification in recent years.
Currently, the design and production technology of PCHE is mainly mastered by individual foreign enterprises, wherein PCHE produced by VPE company in the United states is applied to the fields of LNG gasification, LNG liquefaction and heat exchange of floating LNG processing devices. However, most of domestic PCHE researches are still in the engineering prototype testing stage at present, and basically no real ship test and corresponding industrial application exist. At present, ultrahigh pressure and ultralow temperature tests are also carried out on a test prototype of the printed plate type LNG heat exchanger by some colleges and universities or scientific research units at home, but the ultrahigh pressure and ultralow temperature tests only stay in a laboratory test stage and are not carried out on a real ship.
Real-scale onshore testing of PCHE for LNG presents some of the following problems: 1) LNG working medium required by the test process is flammable and explosive, the storage requirement on the environment is extremely strict, and the safety problem is an important point to be considered in the test process, so that at present, no onshore laboratory which can use LNG as the working medium exists; 2) the storage capacity of some LNG storage tanks is small, so that the large demand of a large amount of tests on LNG cannot be met; 3) the PCHE has large heat exchange quantity, a large amount of natural gas in a supercritical state generated in the heat exchange process is difficult to recover and is burnt to waste, a whole set of natural gas liquefying device is additionally required for liquefying and recovering the natural gas, the manufacturing cost is high, the environment is polluted by directly discharging the natural gas, and potential safety hazards exist; 4) the PCHE has large heat exchange quantity, large demand for heating heat sources such as steam, propane and the like, corresponding auxiliary devices are also required to be added in the test, and the investment cost is huge.
Disclosure of Invention
In view of this, the invention provides a high-efficiency compact heat exchanger testing device and a testing method thereof, so as to realize real-scale testing of a printed circuit board type heat exchanger (PCHE) for an LNG ship.
A high-efficiency compact heat exchanger testing device comprises a skid-mounted box body, a heat exchanger, a heat source system, a cold source system, a measuring system and a monitoring system which are arranged in the skid-mounted box body,
the heat source system and the cold source system are respectively used for conveying a heat source medium and a cold source medium in the floating type storage and regasification device to the heat exchanger for heat exchange and enabling the heat source medium and the cold source medium after heat exchange to flow back to the floating type storage and regasification device again;
the measuring system is used for detecting medium parameters such as temperature, pressure, flow and the like before and after cold and heat exchange is carried out on a heat source medium in the heat source system and a cold source medium in the cold source system, calculating and analyzing the detected parameters to obtain data such as heat exchange coefficient, flow pressure drop and the like of the cold and heat source medium in the heat exchanger after heat exchange, and further comparing the data with a design value of the heat exchanger to analyze whether the tested heat exchanger meets the set requirement;
the monitoring system is used for monitoring whether the data transmitted from the measuring system meets the requirement of the test specification and making corresponding feedback; the monitoring system can also carry out different working condition tests by adjusting the opening degree of the inlet control valve of the cold and heat source; in an emergency situation, the monitoring system can receive external signals and control the cold source inlet emergency cut-off valve to make emergency feedback.
Preferably, the heat source system comprises a heat source medium supply pipe and a heat source medium discharge pipe, one end of the heat source medium supply pipe is connected with the heat source outlet of the floating type storage and regasification device through a first connecting pipe, the other end of the heat source medium supply pipe is directly connected with the heat source inlet of the heat exchanger, one end of the heat source medium discharge pipe is directly connected with the heat source outlet of the heat exchanger, and the other end of the heat source medium discharge pipe is connected with the heat source inlet of the floating type storage and regasification device through a second connecting pipe;
the cold source system comprises a cold source medium supply pipe and a cold source medium discharge pipe, one end of the cold source medium supply pipe is connected with a cold source outlet of the floating type storage and regasification device through a third connecting pipe, the other end of the cold source medium supply pipe is directly connected to a cold source inlet of the heat exchanger, one end of the cold source medium discharge pipe is directly connected to the cold source outlet of the heat exchanger, and the other end of the cold source medium discharge pipe is connected with a cold source inlet of the floating type storage and regasification device through a fourth connecting pipe.
Preferably, the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are hose connecting interfaces which are reserved on the skid-mounted module and connected with the FSRU, and can bear low temperature and high pressure required by the test.
Preferably, the heat source medium supply pipe comprises a heat source medium supply main pipe connected to a heat source inlet of the heat exchanger, and a plurality of heat source medium supply branch pipes connected in parallel to a liquid inlet end of the heat source medium supply main pipe, the heat source medium supply main pipe is provided with a first flow meter, a first temperature sensor and a first pressure sensor, each heat source medium supply branch pipe is connected with the first connecting pipe, and each heat source medium supply branch pipe is provided with a first control valve group.
Preferably, the first set of control valves includes an isolation valve and a control valve.
Preferably, the heat source medium discharge pipe comprises a heat source medium discharge main pipe connected to a heat source outlet of the heat exchanger and a plurality of heat source medium discharge branch pipes connected in parallel to a liquid outlet end of the heat source medium discharge main pipe, a second flowmeter, a second temperature sensor and a second pressure sensor are mounted on the heat source medium discharge main pipe, each heat source medium discharge branch pipe is connected with a second connecting pipe, and a second control valve group is mounted on each heat source medium discharge branch pipe.
Preferably, the second set of control valves includes only isolation valves.
Preferably, a third control valve set, a third flow meter, a third temperature sensor and a third pressure sensor are installed on the cold source medium supply pipe,
and a fourth control valve group, a fourth flowmeter, a fourth temperature sensor and a fourth pressure sensor are arranged on the cold source medium discharge pipe.
Preferably, the third control valve set includes an isolation valve, a control valve and an emergency shut-off valve, and the fourth control valve set includes only an isolation valve.
A testing method of a high-efficiency compact heat exchanger testing device specifically comprises the following steps:
s1, connecting the high-efficiency compact heat exchanger testing device with a floating storage and regasification device by using a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe;
s2, checking the high-efficiency compact heat exchanger testing device and purging a cold source system of the high-efficiency compact heat exchanger testing device;
s3, the floating type storage and regasification device heats the heat source medium, when the heat source medium is heated to a set temperature, the heat source medium and the cold source medium in the floating type storage and regasification device are respectively conveyed to the heat exchanger through the heat source system and the cold source system to carry out cold and heat exchange, and the heat source medium and the cold source medium after heat exchange flow back to the floating type storage and regasification device again;
the measuring system calculates and analyzes the medium parameters after the detected cold and heat source medium exchanges heat to obtain the data of the heat exchange coefficient, the flow pressure drop and the like of the cold and heat source medium in the heat exchanger, and transmits all the data to the monitoring system; the monitoring system performs feedback processing on the received data according to the requirement of the test specification; meanwhile, the monitoring system can also carry out different working condition tests by adjusting the opening degree of the inlet control valve of the cold and heat source; in an emergency situation, the monitoring system can receive external signals and control the cold source inlet emergency cut-off valve to make emergency feedback.
Preferably, the specific steps of checking the high-efficiency compact heat exchanger testing device and purging the cold source system thereof in step S2 are as follows:
firstly, checking whether leakage exists at the joint of each pipeline in a heat source system in the high-efficiency compact heat exchanger testing device, detecting the air tightness of a cold source system, and checking whether a measuring system and a monitoring system work normally;
then, introducing inert gas into the cold source system to blow and wash the pipeline of the cold source system to make the pipeline in an inerting state;
and after the pipeline of the cold source system is in an inerting state, introducing a cold source medium in the floating type storage and regasification device into the cold source system to pre-cool the pipeline of the cold source system.
The invention has the beneficial effects that:
1. the heat exchanger, the heat source system, the cold source system, the measuring system and the monitoring system are assembled in the skid-mounted box body and integrated into a movable skid-mounted module, and four hose connecting interfaces connected with the FSRU are reserved in the skid-mounted module. When the heat exchange performance of the heat exchanger is tested, only the hose interface reserved by the skid-mounted module is required to be connected with the corresponding cold and heat source medium inlet and outlet on the FSRU and the electrical equipment connection is completed, so that the skid-mounted heat exchanger is very convenient to mount and dismount, the field workload and the mounting time are greatly saved, and the cost is saved.
2. The heat source medium supply pipe and the heat source medium discharge pipe can convey different types of heating media, the heat source media can be selected according to actual conditions during testing, and the reserved heat source medium branch pipe is further arranged, so that more selectivity is provided for the heat source media for testing. In addition, each heating medium conveying pipeline is provided with an isolation valve, so that different heating media can be effectively prevented from being mixed.
3. The testing device can test the performance of the PCHE with high flow, and the performance of the PCHE is tested by using various complete auxiliary facilities of the FSRU during the test, so that the cost of the supporting facilities of the device is greatly saved, and the economy is high.
4. The LNG inlet of the cold source medium supply pipe is provided with the emergency cut-off valve, so that the LNG supply can be cut off in an emergency, and the test safety is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of the present invention.
The reference numerals in the figures have the meaning:
1. an isolation valve; 2. an emergency cut-off valve; 3. a first flow meter; 4. a first temperature sensor; 5. a first pressure sensor; 6. a heat exchanger PCHE prototype; 7. a data acquisition instrument; 8. a computer; 9. a monitoring module; 10. a second flow meter; 11. a second temperature sensor; 12. a second pressure sensor; 13. a third flow meter; 14. a third temperature sensor; 15. a third pressure sensor; 16. a fourth flow meter; 17. a fourth temperature sensor; 18. a fourth pressure sensor; 19. a first connecting pipe; 20. a second connecting pipe; 21. a third connecting pipe; 22. a fourth connecting pipe; 23-31, an isolation valve; 33-37, a control valve; 38. a heat source medium supply pipe; 39. a heat source medium discharge pipe; 40. a cold source medium supply pipe; 41. and a cold source medium discharge pipe.
Detailed Description
In order that the objects, aspects and advantages of the invention will become more apparent, the invention will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited by these terms, nor should they be construed as indicating or implying relative importance. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are used in a broad sense, and for example, they may be mechanically connected, they may be connected through the inside of two elements, they may be directly connected, they may be indirectly connected through an intermediate, and those skilled in the art may understand the specific meaning of the above terms according to specific situations.
Because natural gas is inflammable and explosive, the problem of potential safety hazard exists in real-scale testing of a printed circuit board type heat exchanger (PCHE) using LNG as a working medium, and the PCHE has large heat exchange quantity and large demand of heat source medium, and a large amount of natural gas can be generated by gasification, so that corresponding matching devices for testing the heat exchange performance of the PCHE have huge investment. In order to solve the problem, the invention provides a testing device and a testing method of a high-efficiency compact heat exchanger, which test PCHE on a Floating Storage and Regasification Unit (FSRU) by using a perfect regasification module of the FSRU.
For better understanding of the technical solutions of the present invention, the following detailed description of the present invention is provided with reference to the accompanying drawings.
The high-efficiency compact heat exchanger testing device provided by the invention comprises a skid-mounted box body, and a heat exchanger 6, a heat source system, a cold source system, a measuring system and a monitoring system which are arranged in the skid-mounted box body.
The heat source system and the cold source system are respectively used for conveying a heat source medium and a cold source medium in the floating type storage and regasification device to the heat exchanger 6 for heat exchange, and enabling the heat source medium and the cold source medium after heat exchange to flow back to the floating type storage and regasification device again.
The measuring system is used for detecting medium parameters such as temperature, pressure, flow and the like before and after cold and heat exchange is carried out on a heat source medium in a heat source system and a cold source medium in a cold source system, calculating and analyzing the detected parameters to obtain data such as heat exchange coefficients and flowing pressure drop of the cold and heat source medium in the heat exchanger after the heat exchange, and further comparing the data with a design value of the heat exchanger to analyze whether the tested heat exchanger meets the set requirement.
The monitoring system is used for monitoring whether the data transmitted from the measuring system meets the requirement of the test specification and making corresponding feedback; the monitoring system can also carry out different working condition tests by adjusting the opening degree of the inlet control valve of the cold and heat source; in case of emergency, the monitoring system can receive external signals and control the emergency cut-off valve at the cold source inlet to make emergency feedback.
Specifically, as shown in fig. 1, the heat source system includes a heat source medium supply pipe 38 and a heat source medium discharge pipe 39, the heat source medium supply pipe 38 has one end connected to the heat source outlet of the floating storage and regasification plant through a first connection pipe 19 and the other end directly connected to the heat source inlet of the heat exchanger 6, and the heat source medium discharge pipe 39 has one end directly connected to the heat source outlet of the heat exchanger 6 and the other end connected to the heat source inlet of the floating storage and regasification plant through a second connection pipe 20.
The heat source medium supply pipe 38 comprises a heat source medium supply main pipe connected to a heat source inlet of the heat exchanger 6 and a plurality of heat source medium supply branch pipes connected in parallel to the liquid inlet end of the heat source medium supply main pipe, a first flowmeter 3, a first temperature sensor 4 and a first pressure sensor 5 are installed on the heat source medium supply main pipe, each heat source medium supply branch pipe is connected with the first connecting pipe 19, and a first control valve group is installed on each heat source medium supply branch pipe. In this embodiment, the liquid inlet end of the heat source medium supply main pipe is connected in parallel with four heat source medium supply branch pipes, the four heat source medium supply branch pipes respectively and correspondingly convey different types of heat source media, such as seawater, steam, propane, reserved media and the like, each heat source medium supply branch pipe is provided with a group of first control valve groups, each first control valve group comprises isolation valves 23-26 and control valves 33-36, the control valves 33-36 on each heat source medium supply branch pipe are all connected with the monitoring system through signal lines, and the first flow meter 3, the first temperature sensor 4 and the first pressure sensor 5 are also connected with the monitoring system through signal lines.
The heat source medium discharge pipe 39 comprises a heat source medium discharge main pipe connected to a heat source outlet of the heat exchanger 6 and a plurality of heat source medium discharge branch pipes connected in parallel to a liquid outlet end of the heat source medium discharge main pipe, the heat source medium discharge main pipe is provided with a second flowmeter 10, a second temperature sensor 11 and a second pressure sensor 12, and the second flowmeter 10, the second temperature sensor 11 and the second pressure sensor 12 are connected with a monitoring system through signal lines. Each heat source medium discharging branch pipe is connected with the second connecting pipe 20, and a second control valve group is installed on each heat source medium discharging branch pipe. In this embodiment, the liquid outlet end of the main heat source medium discharge pipe is connected in parallel with four branch heat source medium discharge pipes, each branch heat source medium discharge pipe is provided with a group of second control valve groups, and each second control valve group only comprises an isolation valve 27-30.
The cold source system comprises a cold source medium supply pipe 40 and a cold source medium discharge pipe 41, one end of the cold source medium supply pipe 40 is connected with a cold source outlet of the floating type storage and regasification device through a third connection pipe 21, the other end of the cold source medium supply pipe is directly connected to a cold source inlet of the heat exchanger 6, one end of the cold source medium discharge pipe 41 is directly connected to the cold source outlet of the heat exchanger 6, and the other end of the cold source medium discharge pipe is connected with the cold source inlet of the floating type storage and regasification device through a fourth connection pipe 22.
And a third control valve group, a third flow meter 13, a third temperature sensor 14 and a third pressure sensor 15 are installed on the cold source medium supply pipe 40, the third control valve group comprises an isolation valve 1, a control valve 37 and an emergency cut-off valve 2, the control valve 37 and the emergency cut-off valve 2 are connected with the monitoring system through signal lines, and the third flow meter 13, the third temperature sensor 14 and the third pressure sensor 15 are also connected with the monitoring system through signal lines.
And a fourth control valve group, a fourth flow meter 16, a fourth temperature sensor 17 and a fourth pressure sensor 18 are installed on the cold source medium discharge pipe 41, the fourth control valve group only comprises an isolation valve 31, and the fourth flow meter 16, the fourth temperature sensor 17 and the fourth pressure sensor 18 are connected with a monitoring system through signal lines.
All the flow meters, the pressure sensors, the temperature sensors, the data acquisition instruments and the computers in the present application constitute the measurement system of the present application together, wherein the first flow meter 3 and the second flow meter 10 are respectively used for detecting the flow rate of the heat source medium in the heat source medium supply pipe 38 and the heat source medium discharge pipe 39, the first temperature sensor 4 is used for detecting the temperature of the heat source medium in the heat source medium supply pipe 38 before performing heat and cold exchange, the second temperature sensor 11 is used for detecting the temperature of the heat source medium in the heat source medium discharge pipe 39 after performing heat and cold exchange, and the first pressure sensor 5 and the second pressure sensor 12 are respectively used for detecting the pipeline pressure of the heat source medium supply pipe 38 and the heat source medium discharge pipe 39; the third flow meter 13 and the fourth flow meter 16 are respectively used for detecting the flow rate of the cold source medium in the cold source medium supply pipe 38 and the cold source medium discharge pipe 39, the third temperature sensor 14 is used for detecting the temperature of the cold source medium in the cold source medium supply pipe 38 before cold and heat exchange is performed, the fourth temperature sensor 17 is used for detecting the temperature of the cold source medium in the cold source medium discharge pipe after the cold and heat exchange is performed, and the third pressure sensor 15 and the fourth pressure sensor 18 are respectively used for detecting the pipeline pressures of the cold source medium supply pipe 38 and the cold source medium discharge pipe 39. Signals measured by all sensors and the flow meters in the measuring system are transmitted to the data acquisition instrument through signal lines and then transmitted to the computer, the computer processes the received data signals, and the processed data can be transmitted to the monitoring system.
The monitoring system comprises a monitoring module 9. The monitoring module receives data transmitted from the measuring system and feeds back the data correspondingly, if the data such as pressure, flow and the like exceed a set value during testing, the monitoring system can give an alarm and emergently control the opening of the valve to adjust, and the safety problem caused by overhigh testing pressure or overlarge flow is avoided.
The monitoring module 9 of the monitoring system can also receive an external instruction signal, and in an emergency, the monitoring module 9 can control the emergency cut-off valve 2 to perform emergency cut-off to stop the supply of the cold source medium (LNG) in the cold source medium supply pipe 40.
Meanwhile, when the performance of the heat exchanger is tested, the monitoring system can control and adjust the valve opening of each control valve so as to test under different flow working conditions.
Through assembling heat exchanger 6, heat source system, cold source system, measurement system and monitored control system in sled dress formula box (not including first connecting pipe, second connecting pipe, third connecting pipe and fourth connecting pipe), integrated as a mobilizable sled dress module, when testing heat transfer performance to heat exchanger 6, only need with this sled dress module with FSRU link to each other can, saved field work volume and installation time greatly, practiced thrift the cost.
In this embodiment, the first connecting pipe, the second connecting pipe, the third connecting pipe and the fourth connecting pipe are all low-temperature hoses.
The printed circuit board type heat exchanger (PCHE)6 internally comprises two medium channels of a cold source and a heat source, and during testing, the cold source medium and the heat source medium conveyed by the FSRU exchange heat in the printed circuit board type heat exchanger (PCHE) 6.
The working principle of the high-efficiency compact heat exchanger testing device is as follows:
the heat source medium on the FSRU heat source side is pressurized by the compressor, and the pressurized heat source medium enters the heat source medium supply pipe 38 of the high-efficiency compact heat exchanger testing device through the first connecting pipe 19 and is conveyed to the heat source channel of the PCHE prototype 6 through the heat source medium supply pipe 38. Meanwhile, after the LNG pumped from the LNG storage tank is increased by the boost pump of the FSRU, the LNG enters the cold source medium supply pipe 40 of the high-efficiency compact heat exchanger testing apparatus through the third connection pipe 21, and is transported to the cold source channel of the PCHE prototype 6 through the cold source medium supply pipe 40. And (3) performing heat exchange on the heat source medium and the cold source medium (LNG) in the PCHE prototype 6, after the heat exchange is completed, refluxing the heat source medium to the FSRU along the heat source medium discharge pipe 38 and the second connecting pipe 20, heating and gasifying the heat source again through a heater in the FSRU and the like, and refluxing the LNG which is in a supercritical fluid state when the heat exchange is completed to the FSRU along the cold source medium discharge pipe 41 and the fourth connecting pipe 22.
The invention also provides a testing method of the testing device of the efficient compact heat exchanger, which comprises the following steps:
s1, connecting the high efficiency compact heat exchanger testing apparatus with a floating storage and regasification plant using the first connection pipe 19, the second connection pipe 20, the third connection pipe 21, and the fourth connection pipe 22.
S2, checking the high-efficiency compact heat exchanger testing device and purging a cold source system of the high-efficiency compact heat exchanger testing device.
Specifically, firstly, introducing various heat source media with stable operation, monitoring the leakage condition of each pipeline connecting point in a heat source system, and performing leakage inspection on the heat source system; closing the isolating valve 31 at the outlet of the PCHE prototype 6, opening the isolating valve 1 at the inlet of the cold source medium supply pipe 40, allowing inert gas (gaseous N2) to enter the cold source system, performing air tightness inspection on each pipeline connecting point in the cold source system, and performing air tightness inspection on the cold source system; checking whether the measurement system and the monitoring system work normally;
then, introducing inert gas into the cold source system to blow and wash the pipeline of the cold source system to enable the pipeline to be in an inerting state, namely opening the isolation valve 1 and the control valve 37 to enable the gaseous N2 to continuously enter the pipeline of the cold source system to blow and wash the pipeline to enable the pipeline to be in the inerting state;
after the pipeline of the cold source system is in an inerting state, LNG in the pipeline is replaced by LNG vapor and introduced into the cold source system, so that the content of CO2 and water vapor in the pipeline of the cold source system is reduced, and icing during subsequent cooling is avoided; after inerting with N2 and purging with LNG vapor, the cold source medium (LNG) in the floating storage and regasification facility is introduced into the cold source system to pre-cool the pipeline of the cold source system until the temperature of the pipeline falls to-130 ℃ and below.
And S3, the floating type storage and regasification device heats the heat source medium, and when the heat source medium is heated to a set temperature, the LNG in the floating type storage and regasification device is switched from the original regasification module to the skid-mounted module.
Then, respectively conveying the heat source medium and the cold source medium in the floating type storage and regasification device to a heat exchanger 6 through a heat source system and a cold source system for heat exchange, and enabling the heat source medium and the cold source medium after heat exchange to flow back to the floating type storage and regasification device again;
the measuring system calculates and analyzes the medium parameters of the cold and heat source medium after heat exchange to obtain the data of the heat exchange coefficient, the flow pressure drop and the like of the cold and heat source medium in the heat exchanger, and further can compare the data with the design value of the heat exchanger to analyze whether the tested heat exchanger meets the set requirement.
When the fourth temperature sensor 17 detects that the temperature change of the LNG at the outlet of the cold source medium discharge pipe 41 tends to be stable, it indicates that the cold-heat exchange between the cold source medium and the heat source medium in the heat exchanger 6 is completed, at this time, the LNG transferred from the cold source outlet of the heat exchanger 6 into the cold source medium discharge pipe 41 is the supercritical fluid state LNG, so that the computer can calculate the heat exchange coefficient and the flow pressure drop of the supercritical fluid state LNG in the heat exchanger PCHE6 according to the received changes of the temperature, the pressure, the flow rate and the like of the LNG at the inlet and outlet, and when the error between the calculation result and the design value is not more than 3%, the heat exchange performance of the PCHE model machine 6 is considered to meet the design requirement.
And then, controlling the valve opening of the cold and heat source inlet control valves 33-37 through the monitoring module 9, changing the inlet flow of the cold and heat source, and testing under various flow working conditions according to the steps.
At the end of the test, the LNG test skid is switched back to the FSRU regasification module.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (10)
1. A high-efficiency compact heat exchanger testing device is characterized by comprising a skid-mounted box body, a heat source system, a cold source system, a measuring system and a monitoring system which are arranged in the skid-mounted box body,
the heat source system and the cold source system are respectively used for conveying a heat source medium and a cold source medium in the floating type storage and regasification device to the heat exchanger for heat exchange and enabling the heat source medium and the cold source medium after heat exchange to flow back to the floating type storage and regasification device again;
the measuring system is used for detecting medium parameters before and after cold and heat exchange is carried out on a heat source medium in the heat source system and a cold source medium in the cold source system, calculating heat exchange coefficients and flowing pressure drop data of the cold and heat source medium after heat exchange in the heat exchanger according to the detected parameters, and further analyzing whether the heat exchange performance of the heat exchanger meets set requirements or not;
the monitoring system is used for monitoring whether the data transmitted from the measuring system meets the requirement of the test specification and making corresponding feedback; the monitoring system can also carry out different working condition tests by adjusting the opening degree of the inlet control valve of the cold and heat source; in an emergency situation, the monitoring system can receive external signals and control the cold source inlet emergency cut-off valve to make emergency feedback.
2. The high-efficiency compact heat exchanger test device of claim 1, wherein the heat source system comprises a heat source medium supply pipe and a heat source medium discharge pipe, wherein one end of the heat source medium supply pipe is connected with the heat source outlet of the floating storage and regasification device through a first connection pipe, the other end of the heat source medium supply pipe is directly connected with the heat source inlet of the heat exchanger, one end of the heat source medium discharge pipe is directly connected with the heat source outlet of the heat exchanger, and the other end of the heat source medium discharge pipe is connected with the heat source inlet of the floating storage and regasification device through a second connection pipe;
the cold source system comprises a cold source medium supply pipe and a cold source medium discharge pipe, one end of the cold source medium supply pipe is connected with a cold source outlet of the floating type storage and regasification device through a third connecting pipe, the other end of the cold source medium supply pipe is directly connected to a cold source inlet of the heat exchanger, one end of the cold source medium discharge pipe is directly connected to the cold source outlet of the heat exchanger, and the other end of the cold source medium discharge pipe is connected with a cold source inlet of the floating type storage and regasification device through a fourth connecting pipe.
3. The efficient compact heat exchanger testing device as recited in claim 2, wherein the heat source medium supply pipe comprises a heat source medium supply main pipe connected to a heat source inlet of the heat exchanger, and a plurality of heat source medium supply branch pipes connected in parallel to a liquid inlet end of the heat source medium supply main pipe, the heat source medium supply main pipe is provided with a first flow meter, a first temperature sensor and a first pressure sensor, each heat source medium supply branch pipe is connected to the first connecting pipe, and each heat source medium supply branch pipe is provided with a first control valve group.
4. An efficient compact heat exchanger test set as recited in claim 3 wherein said first set of control valves includes an isolation valve and a control valve.
5. The high-efficiency compact heat exchanger testing device as claimed in claim 2, wherein the heat source medium discharging pipe comprises a heat source medium discharging main pipe connected to the heat source outlet of the heat exchanger, and a plurality of heat source medium discharging branch pipes connected in parallel to the liquid outlet end of the heat source medium discharging main pipe, the heat source medium discharging main pipe is provided with a second flow meter, a second temperature sensor and a second pressure sensor, each heat source medium discharging branch pipe is connected with the second connecting pipe, and each heat source medium discharging branch pipe is provided with a second control valve group.
6. An efficient and compact heat exchanger testing apparatus as recited in claim 5 wherein said second set of control valves includes only isolation valves.
7. The efficient compact heat exchanger testing device according to claim 2, wherein a third control valve set, a third flow meter, a third temperature sensor and a third pressure sensor are installed on the cold source medium supply pipe,
and a fourth control valve group, a fourth flowmeter, a fourth temperature sensor and a fourth pressure sensor are arranged on the cold source medium discharge pipe.
8. The efficient compact heat exchanger testing apparatus of claim 7, wherein the third set of control valves includes isolation valves, control valves, and emergency disconnect valves, and the fourth set of control valves includes only isolation valves.
9. A testing method of a high-efficiency compact heat exchanger testing device as claimed in any one of claims 1-8, characterized by comprising the following steps:
s1, connecting the high-efficiency compact heat exchanger testing device with a floating storage and regasification device by using a first connecting pipe, a second connecting pipe, a third connecting pipe and a fourth connecting pipe;
s2, checking the high-efficiency compact heat exchanger testing device and purging a cold source system of the high-efficiency compact heat exchanger testing device;
s3, the floating type storage and regasification device heats the heat source medium, when the heat source medium is heated to a set temperature, the heat source medium and the cold source medium in the floating type storage and regasification device are respectively conveyed to the heat exchanger through the heat source system and the cold source system to carry out cold and heat exchange, and the heat source medium and the cold source medium after heat exchange flow back to the floating type storage and regasification device again;
the measuring system calculates and analyzes medium parameters after heat exchange is carried out on the detected cold and heat source media to obtain the heat exchange coefficients and the flow pressure drop of the cold and heat source media in the heat exchanger, and transmits all data to the monitoring system; and the monitoring system performs feedback processing on the received data according to the requirement of the test specification.
10. The method for testing the high-efficiency compact heat exchanger testing device according to claim 9, wherein the steps of inspecting the high-efficiency compact heat exchanger testing device and purging a heat sink system of the high-efficiency compact heat exchanger testing device in the step S2 are as follows:
firstly, checking whether leakage exists at the joint of each pipeline in a heat source system in the high-efficiency compact heat exchanger testing device, detecting the air tightness of a cold source system, and checking whether a measuring system and a monitoring system work normally;
then, introducing inert gas into the cold source system to blow and wash the pipeline of the cold source system to make the pipeline in an inerting state;
and after the pipeline of the cold source system is in an inerting state, introducing a cold source medium in the floating type storage and regasification device into the cold source system to pre-cool the pipeline of the cold source system.
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