CN109115532B - Performance testing device and method for middle-deep concentric sleeve type heat exchanger - Google Patents
Performance testing device and method for middle-deep concentric sleeve type heat exchanger Download PDFInfo
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Abstract
The invention discloses a performance testing device and a performance testing method for a middle-deep concentric sleeve type heat exchanger, wherein the device comprises distributed metal armored optical cable temperature measuring equipment, an optical fiber temperature measuring data collector, a check valve, a water pump, a Y-shaped filter, a heat meter, a buffer water tank, a dosing device, a first cold and hot water unit and a second cold and hot water unit; during testing, the test device also comprises a middle-deep concentric double-pipe type heat exchanger outer sleeve and a middle-deep concentric double-pipe type heat exchanger inner pipe, wherein the middle-deep concentric double-pipe type heat exchanger inner pipe is sleeved in the middle-deep concentric double-pipe type heat exchanger outer sleeve; aiming at the performance test of the middle-deep concentric sleeve type heat exchanger, the invention accurately evaluates the performance of the middle-deep concentric sleeve type heat exchanger in the shortest possible time by designing different flow rates, different inlet water temperatures, different heat taking amounts and different running times under different working conditions so as to provide reference for the regional layout.
Description
Technical Field
The invention belongs to the technical field of performance testing of a middle-deep concentric sleeve type heat exchanger, and particularly relates to a device and a method for testing the performance of the middle-deep concentric sleeve type heat exchanger.
Background
The performance test of the middle-deep concentric sleeve type heat exchanger has a plurality of influence factors, such as the flow rate of circulating water in the buried pipe, the temperature of water at the inlet of the buried pipe, the heat quantity of the buried pipe, the depth of the buried pipe and the like. In order to obtain as much valuable information as possible in a limited time, the experiment must be scientifically and carefully designed from a time plan and parameter changes.
Disclosure of Invention
The invention aims to provide a device and a method for testing the performance of a middle-deep concentric double pipe heat exchanger, which are used for accurately evaluating the performance of the middle-deep concentric double pipe heat exchanger in the shortest possible time by designing different flow rates, different inlet water temperatures, different heat taking amounts and different running times under different working conditions so as to provide reference for regional layout.
The invention is realized by adopting the following technical scheme:
a performance testing device for a middle-deep concentric sleeve type heat exchanger comprises distributed metal armored optical cable temperature measuring equipment, an optical fiber temperature measuring data collector, a check valve, a water pump, a Y-shaped filter, a heat meter, a buffer water tank, a dosing device, a first cold and hot water unit and a second cold and hot water unit; wherein,
during testing, the test device also comprises a middle-deep concentric double-pipe type heat exchanger outer sleeve and a middle-deep concentric double-pipe type heat exchanger inner pipe, wherein the middle-deep concentric double-pipe type heat exchanger inner pipe is sleeved in the middle-deep concentric double-pipe type heat exchanger outer sleeve;
the distributed metal armored optical cable temperature measuring equipment is fixed and tightly attached to the outer wall of the outer sleeve of the middle-deep layer concentric sleeve heat exchanger through an optical fiber protector and a strapping tape, and the ground part of the optical cable is connected with an optical fiber temperature measuring data collector and records one datum per meter per minute; the outlet of the middle-deep concentric sleeve type heat exchanger outer sleeve is communicated with the inlet of the middle-deep concentric sleeve type heat exchanger inner tube, the outlet of the middle-deep concentric sleeve type heat exchanger inner tube is connected with the inlet of a Y-shaped filter, the outlet of the Y-shaped filter is connected with the inlet of a heat meter, the outlet of the heat meter is connected with the inlet of a first cold and hot water unit and the inlet of a second cold and hot water unit, the outlet of the first cold and hot water unit and the outlet of the second cold and hot water unit are connected with the inlet of a buffer water tank, the outlet of the buffer water tank is connected with the inlet of a water pump, the outlet of a dosing device is connected with the inlet of the water pump, and the.
The invention is further improved in that the device also comprises a high-level water tank, and an outlet of the high-level water tank is connected with an outlet of the buffer water tank and is used for supplementing the loss of water circulation of the device.
The invention has the further improvement that a pipeline connecting the outlet of the inner pipe of the middle-deep concentric double-pipe heat exchanger and the inlet of the Y-shaped filter is sequentially provided with a first pressure sensor, a first temperature sensor, a first flow sensor, a tenth metal hard sealing butterfly valve and an exhaust valve;
a third temperature sensor and a third flow sensor are arranged on a pipeline connecting the outlet of the Y-shaped filter and the inlet of the heat meter;
a pipeline connecting the outlet of the heat meter and the inlet of the first cold and hot water unit is provided with a third pressure sensor, a sixth metal hard sealing butterfly valve, a seventh temperature sensor and a third flexible joint;
a third pressure sensor, an eighth metal hard sealing butterfly valve, a ninth temperature sensor and a seventh flexible joint are arranged on a pipeline connecting the outlet of the heat meter and the inlet of the second cold and hot water unit;
a pipeline connecting the outlet of the first cold and hot water unit and the inlet of the buffer water tank is provided with a fifth flexible joint, an eighth temperature sensor, a seventh metal hard seal butterfly valve, a fifth pressure sensor and a fourth metal hard seal butterfly valve;
a ninth flexible joint, a tenth temperature sensor, a ninth metal hard sealing butterfly valve, a fifth pressure sensor and a fourth metal hard sealing butterfly valve are arranged on a pipeline connecting the outlet of the second cold and hot water unit and the inlet of the buffer water tank;
a fifth temperature sensor and a sixth temperature sensor are arranged on the buffer water tank, the outlet and the inlet of the buffer water tank are connected through a pipeline, and a fifth metal hard sealing butterfly valve is arranged on the pipeline;
a pipeline connecting the outlet of the buffer water tank and the inlet of the water pump is provided with a third metal hard sealing butterfly valve, a fourth pressure sensor, a fourth temperature sensor, a second metal hard sealing butterfly valve and a second flexible joint;
the dosing device comprises a dosing tank, and a second flanged valve, a metering pump and a first flanged valve are arranged on a pipeline connecting an outlet of the dosing tank and an inlet of the water pump;
a first flexible joint, a check valve, a first metal hard sealing butterfly valve, a second flow sensor, a second temperature sensor and a second pressure sensor are arranged on a pipeline connecting an outlet of the water pump and an inlet of an outer sleeve of the middle-deep concentric sleeve type heat exchanger;
the first cold and hot water unit forms a circulation loop through a fourth flexible joint and a sixth flexible joint, and the second cold and hot water unit forms a circulation loop through an eighth flexible joint and a tenth flexible joint.
A performance test method for a middle-deep concentric sleeve type heat exchanger is based on the performance test device for the middle-deep concentric sleeve type heat exchanger and comprises the following steps:
1) before the test begins, ensuring that a fifth metal hard seal butterfly valve is in a closed state, enabling a third metal hard seal butterfly valve and a fourth metal hard seal butterfly valve at two ends of a buffer water tank to be in an open state, starting a first cold and hot water unit to keep the water temperature at 12 ℃, starting a water pump, and firstly adjusting the flow at an inlet end to be 14.05m according to the requirements of experimental design3The operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 21.17m3The operation time is 72h, and the recovery time is 360 h; adjusting a proper flow according to the field operation condition, wherein the operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 17.56m3The operation time is 72h, and the recovery time is 360 h; the heat exchange performance of the deep concentric sleeve type heat exchanger is tested through the change of the flow, and the ground temperature recovery is mastered through monitoring the formation temperature in the recovery processA rule;
2) the third metal hard seal butterfly valve and the fourth metal hard seal butterfly valve at the two ends of the buffer water tank are still opened and kept in an open mode, and the inlet flow is controlled to be stable to 17.56m by starting the water pump3Starting a first cold and hot water unit to control the change of inlet temperature, firstly adjusting the inlet temperature to 7 ℃, operating for 72 hours and recovering for 360 hours; adjusting the inlet temperature to 17 ℃, operating time to 72h and recovery time to 360 h; testing the heat exchange performance of the medium-deep concentric sleeve type heat exchanger through the change of the inlet temperature, and monitoring the formation temperature in the recovery process to master the earth temperature recovery rule;
3) the third metal hard seal butterfly valve and the fourth metal hard seal butterfly valve at the two ends of the buffer water tank are closed, the opening state of the fifth metal hard seal butterfly valve is adjusted to a closed mode, the water pump is started, and the flow of the inlet is controlled to be stable and 17.56m3Starting a first cold and hot water unit, adjusting the heat to be taken to 0.15MW, operating time to 72h and recovery time to 360 h; adjusting the heat to 0.35MW, running time of 72h and recovery time of 360 h; adjusting a proper heat extraction amount according to the field condition, wherein the operation time is 72h, and the recovery time is 360 h; adjusting the heat to 0.25MW, operating time of 120h and recovery time of 360 h; testing the heat exchange performance of the U-shaped well heat exchanger in the middle and deep layers through the change of heat quantity and different running time lengths, and mastering the earth temperature recovery rule through monitoring the formation temperature in the recovery process;
4) the third metal hard seal butterfly valve and the fourth metal hard seal butterfly valve at the two ends of the buffer water tank are opened, the fifth metal hard seal butterfly valve is closed and adjusted to an open mode, the water pump is started, and the flow of the inlet is controlled to be stable and 17.56m3Starting a first cold and hot water unit, controlling the inlet temperature to be stable at 12 ℃, ensuring the temperature of the buffer water tank to be constant, lifting the depth of an inner tube of the middle-deep concentric double-tube heat exchanger to 2000m, operating time to 72h, and recovering time to 360 h; the depth of an inner tube of the middle-deep concentric sleeve type heat exchanger is increased to 1500m, the running time is 72h, and the recovery time is 360 h; the heat exchange performance of the middle-deep U-shaped well type heat exchanger is tested through the change of the depth of the buried pipe, and the earth temperature recovery rule is mastered through monitoring the formation temperature in the recovery process.
The invention has the following beneficial technical effects:
according to the performance testing device for the middle-deep concentric double-pipe heat exchanger, the heat exchange capability of the middle-deep concentric double-pipe heat exchanger under various complex working conditions can be truly and accurately reflected by controlling the working states of all parts in the testing device; during the period that the system stops operating, the formation temperature can be monitored for a long time, and the distribution and recovery rule of the formation temperature field near the middle-deep concentric double-pipe heat exchanger can be mastered.
The performance test method for the middle-deep concentric sleeve type heat exchanger provided by the invention adopts orthogonal design, various variable working condition tests are completed in as little time as possible, the heat exchange capacity of the middle-deep concentric sleeve type heat exchanger is fully reflected through open design experiments, and the heat exchange capacity of the middle-deep concentric sleeve type heat exchanger under the condition of using at the tail end of a user is reflected through closed design experiments.
Drawings
Fig. 1 is a schematic diagram of a performance test of a deep concentric double pipe heat exchanger according to an embodiment of the present invention. The ground pipe diameters in the figure are DN 200.
Description of reference numerals: 1. a middle-deep concentric sleeve type heat exchanger outer sleeve; 2. an inner pipe of the middle-deep concentric double-pipe heat exchanger; 3. distributed metal armored cable temperature measuring equipment; 4. an optical fiber temperature measurement data collector;
5. a first pressure sensor, 8, a second pressure sensor, 23, a third pressure sensor, 25, a fourth pressure sensor, 28, a fifth pressure sensor;
6. a first temperature sensor, 9, a second temperature sensor, 20, a third temperature sensor, 24, a fourth temperature sensor, 30, a fifth temperature sensor, 31, a sixth temperature sensor, 37, a seventh temperature sensor, 45, an eighth temperature sensor, 46, a ninth temperature sensor, 54, a tenth temperature sensor;
7. a first flow sensor 10, a second flow sensor 21, a third flow sensor;
11. a first metal hard seal butterfly valve, 16, a second metal hard seal butterfly valve, 26, a third metal hard seal butterfly valve, 29, a fourth metal hard seal butterfly valve, 32, a fifth metal hard seal butterfly valve, 41, a sixth metal hard seal butterfly valve, 42, a seventh metal hard seal butterfly valve, 47, an eighth metal hard seal butterfly valve, 51, a ninth metal hard seal butterfly valve, 55, and a tenth metal hard seal butterfly valve;
12. a check valve;
13. a first flexible joint, 15, a second flexible joint, 38, a third flexible joint, 40, a fourth flexible joint, 43, a fifth flexible joint, 44, a sixth flexible joint, 48, a seventh flexible joint, 50, an eighth flexible joint, 52, a ninth flexible joint, 53, a tenth flexible joint;
14. a water pump;
17. an exhaust valve; 18. a high-level water tank; 19. a Y-type filter; 22. a heat meter; 27. a buffer water tank;
33. a first flanged valve, 35, a second flanged valve;
34. a metering pump;
36. a dosing device;
39. a first hot and cold water unit, 49, a second hot and cold water unit.
FIG. 2 is a schematic diagram of outlet temperature change under continuous operating conditions.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the performance testing device for the mid-deep concentric double pipe heat exchanger provided by the invention comprises distributed metal armored optical cable temperature measuring equipment 3, an optical fiber temperature measuring data collector 4, a check valve 12, a water pump 14, a high-level water tank 18, a Y-shaped filter 19, a heat meter 22, a buffer water tank 27, a dosing device 36, a first cold and hot water unit 39 and a second cold and hot water unit.
During testing, the test device further comprises a middle-deep concentric double-pipe type heat exchanger outer sleeve 1 and a middle-deep concentric double-pipe type heat exchanger inner pipe 2, wherein the middle-deep concentric double-pipe type heat exchanger inner pipe 2 is sleeved in the middle-deep concentric double-pipe type heat exchanger outer sleeve 1; the distributed metal armored optical cable temperature measuring equipment 3 is fixed and tightly attached to the outer wall of the outer sleeve 1 of the middle-deep layer concentric sleeve heat exchanger through an optical fiber protector and a strapping tape, the ground part of the optical cable is connected with an optical fiber temperature measuring data collector 4, and one datum is recorded every meter and every minute; an outlet of an outer sleeve 1 of the middle-deep concentric sleeve type heat exchanger is communicated with an inlet of an inner tube 2 of the middle-deep concentric sleeve type heat exchanger, an outlet of the inner tube 2 of the middle-deep concentric sleeve type heat exchanger is connected with an inlet of a Y-shaped filter 19, an outlet of the Y-shaped filter 19 is connected with an inlet of a heat meter 22, an outlet of the heat meter 22 is connected with an inlet of a first cold and hot water unit 39 and an inlet of a second cold and hot water unit 49, an outlet of the first cold and hot water unit 39 and an outlet of the second cold and hot water unit 49 are both connected with an inlet of a buffer water tank 27, an outlet of the buffer water tank 27 is connected with an inlet of a water pump 14, an outlet of a dosing device 36 is connected with an inlet of the water pump; the outlet of the head tank 18 is connected to the outlet of the buffer tank 27 to make up for the loss of water circulation in the apparatus. .
In addition, a first pressure sensor 5, a first temperature sensor 6, a first flow sensor 7, a tenth metal hard sealing butterfly valve 55 and an exhaust valve 17 are sequentially arranged on a pipeline connecting the outlet of the inner pipe 2 of the middle-deep layer concentric sleeve type heat exchanger with the inlet of the Y-shaped filter 19; a third temperature sensor 20 and a third flow sensor 21 are arranged on a pipeline connecting the outlet of the Y-shaped filter 19 with the inlet of the heat meter 22; a third pressure sensor 23, a sixth metal hard sealing butterfly valve 41, a seventh temperature sensor 37 and a third flexible joint 38 are arranged on a pipeline connecting the outlet of the heat meter 22 and the inlet of the first cold and hot water unit 39; a third pressure sensor 23, an eighth metal hard sealing butterfly valve 47, a ninth temperature sensor 46 and a seventh flexible joint 48 are arranged on a pipeline connecting the outlet of the heat meter 22 and the inlet of a second cold and hot water unit 49; a pipeline connecting the outlet of the first cold and hot water unit 39 and the inlet of the buffer water tank 27 is provided with a fifth flexible joint 43, an eighth temperature sensor 45, a seventh metal hard seal butterfly valve 42, a fifth pressure sensor 28 and a fourth metal hard seal butterfly valve 29; a ninth flexible joint 52, a tenth temperature sensor 54, a ninth metal hard seal butterfly valve 51, a fifth pressure sensor 28 and a fourth metal hard seal butterfly valve 29 are arranged on a pipeline connecting the outlet of the second cold and hot water unit 49 and the inlet of the buffer water tank 27; a fifth temperature sensor 30 and a sixth temperature sensor 31 are arranged on the buffer water tank 27, the outlet and the inlet of the buffer water tank 27 are connected through a pipeline, and a fifth metal hard seal butterfly valve 32 is arranged on the pipeline; a pipeline connecting the outlet of the buffer water tank 27 and the inlet of the water pump 14 is provided with a third metal hard sealing butterfly valve 26, a fourth pressure sensor 25, a fourth temperature sensor 24, a second metal hard sealing butterfly valve 16 and a second flexible joint 15; the dosing device 36 comprises a dosing tank, and a second flanged valve 35, a metering pump 34 and a first flanged valve 33 are arranged on a pipeline connecting an outlet of the dosing tank with an inlet of the water pump 14; a first flexible joint 13, a check valve 12, a first metal hard sealing butterfly valve 11, a second flow sensor 10, a second temperature sensor 9 and a second pressure sensor 8 are arranged on a pipeline connecting an outlet of the water pump 14 and an inlet of the outer sleeve 1 of the middle-deep layer concentric sleeve type heat exchanger; the first hot and cold water set 39 forms a circulation loop through the fourth flexible joint 40 and the sixth flexible joint 44, and the second hot and cold water set 49 forms a circulation loop through the eighth flexible joint 50 and the tenth flexible joint 53.
The invention provides a performance test method of a middle-deep concentric sleeve type heat exchanger, which comprises the following steps:
1) before the test is started, the fifth metal hard seal butterfly valve 32 is ensured to be in a closed state, the third metal hard seal butterfly valve 26 and the fourth metal hard seal butterfly valve 29 at the two ends of the buffer water tank 27 are in an open state, the first cold and hot water unit 39 is started to keep the water temperature at 12 ℃, the water pump 14 is started, and according to the requirements of experimental design, the inlet end flow is firstly adjusted to be 14.05m3The operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 21.17m3The operation time is 72h, and the recovery time is 360 h; adjusting a proper flow according to the field operation condition, wherein the operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 17.56m3The operation time is 72h, and the recovery time is 360 h; testing the heat exchange performance of the deep concentric double-pipe heat exchanger through the change of the flow, and monitoring the formation temperature in the recovery process to master the earth temperature recovery rule;
2) the third metal hard seal butterfly valve 26 and the fourth metal hard seal butterfly valve 29 at the two ends of the buffer water tank 27 are still opened and kept in an open mode, and the inlet flow is controlled to be stable at 17.56m by starting the water pump 143The first cold and hot water unit 39 is started to control the inlet temperature change, the inlet temperature is adjusted to 7 ℃, the running time is 72 hours, and the recovery time is 360 hours; adjusting the inlet temperature to 17 ℃, operating time to 72h and recovery time to 360 h; testing the heat exchange performance of the medium-deep concentric sleeve type heat exchanger through the change of the inlet temperature, and monitoring the formation temperature in the recovery process to master the earth temperature recovery rule;
3) the third metal hard seal butterfly valve 26 and the fourth metal hard seal butterfly valve 29 at the two ends of the buffer water tank 27 are closed, the opening state of the metal hard seal butterfly valve 32 is adjusted to a closed mode, the water pump 14 is started, and the inlet flow is controlled to be stable to 17.56m3The first cold and hot water unit 39 is started, the heat is adjusted to be 0.15MW, the running time is 72h, and the recovery time is 360 h; adjusting the heat to 0.35MW, running time of 72h and recovery time of 360 h; adjusting a proper heat extraction amount according to the field condition, wherein the operation time is 72h, and the recovery time is 360 h; adjusting the heat to 0.25MW, operating time of 120h and recovery time of 360 h; testing the heat exchange performance of the U-shaped well heat exchanger in the middle and deep layers through the change of heat quantity and different running time lengths, and mastering the earth temperature recovery rule through monitoring the formation temperature in the recovery process;
4) the third metal hard seal butterfly valve 26 and the fourth metal hard seal butterfly valve 29 at the two ends of the buffer water tank 27 are opened, the metal hard seal butterfly valve 32 is closed and adjusted to an open mode, the water pump 14 is started, and the inlet flow is controlled to be stable to 17.56m3Starting a first cold and hot water unit 39, controlling the inlet temperature to be stable at 12 ℃, ensuring the temperature of the buffer water tank to be constant, lifting the depth of the inner tube 2 of the middle-deep concentric double-tube heat exchanger to 2000m, operating the time for 72h, and recovering the time for 360 h; the depth of an inner tube 2 of the middle-deep concentric double-tube heat exchanger is increased to 1500m, the running time is 72h, and the recovery time is 360 h; the heat exchange performance of the middle-deep U-shaped well type heat exchanger is tested through the change of the depth of the buried pipe, and the earth temperature recovery rule is mastered through monitoring the formation temperature in the recovery process.
Examples
The downhole part of the deep-layer concentric sleeve type heat exchange system comprises an outer sleeve and an inner sleeve, and the inner sleeve has the main function of flow guiding. Circulating water in the system flows into the buried pipe downwards from an annular section formed by the outer sleeve and the inner sleeve, absorbs heat of peripheral rock soil in a downward process, the temperature is gradually increased, heated water flows upwards in the reverse direction of the lower end of the buried pipe through the inner sleeve and finally flows out of the buried pipe to enter a heat exchange system (heat pump unit) on the ground, heat is released in a heat exchanger (evaporator), the water enters the buried pipe again after the temperature is reduced, and the circulation is carried out.
The monitoring instrument equipment distribution: (1) temperature sensor arrangement: two inlets and two outlets of each buried pipe are respectively arranged; two buffer water tank bodies are arranged; one is arranged on each loop of the outlet of the buffer water tank; and the inlets and the outlets of the first cold and hot water unit and the second cold and hot water unit are respectively provided with one. (2) Arrangement of pressure sensors: the inlet and the outlet of each buried pipe are respectively provided with one; one on each side of the pump; the heat pump unit is respectively provided with an inlet and an outlet. (3) Arrangement of flow sensors: one inlet and one outlet of each buried pipe are respectively arranged; (considering whether water leakage exists at the buried pipe part), one heat pump unit is arranged at the inlet of the heat pump unit. (4) Distributed metal armored cable temperature measuring equipment: adopting a binding and clip fixing mode; two optical cables are arranged in each shaft.
The invention provides a method for testing the heat exchange performance of a middle-deep concentric sleeve, which comprises the following testing steps:
(1) the experimental design comprises ① setting into an open system and a closed system, ② determining experimental conditions, ③ determining stabilization of heat exchange operation of the buried pipe and well temperature recovery time, and ④ dividing the system into 4 groups of experiments according to different temperatures, flow rates, heat extraction amounts and depths by using an orthogonal experimental design method.
(2) Open the adjustment with heat transfer test system surge tank valve to open mode, through the invariable entry temperature of hot and cold water unit control, the entry changes the flow with the water pump control, and every flow is according to the operating duration operation of design, waits according to the recovery time of design, tests the heat transfer condition of different entry flows in proper order after the data admission of whole process is complete.
(3) The valve of the buffer water tank of the heat exchange test system is still opened and is kept to an open mode, the constant inlet flow is controlled by the inlet water pump, the inlet temperature is controlled by the cold and hot water unit to change, each temperature runs according to the designed running time, the temperature is waited according to the designed recovery time, and the heat exchange conditions of different inlet temperatures are tested in sequence after the data of the whole process is recorded and taken completely.
(4) Close the adjustment to closed mode with heat transfer test system surge tank valve, through the invariable entry flow of entry water pump control, prepare the heat change with cold and hot water generating set control, every gets the heat and moves according to the operating duration of design, waits according to the recovery time of design, tests the heat transfer condition of different heat consumptions in proper order after the data admission of whole process is complete.
(5) Close the adjustment to closed mode with heat transfer test system buffer tank valve, through the invariable entry flow of entry water pump control, with the invariable entry temperature of hot and cold water unit control, change the inner tube degree of depth through lifting deep layer concentric sleeve type heat transfer device inner tube, every inner tube degree of depth is according to the operating duration operation of design, waits according to the recovery time of design, tests the heat transfer condition of different inner tube depths in proper order after the data admission of whole process is complete.
Specifically, the method comprises the following operation steps:
(1) design of experiments
① open cycle with constant inlet water temperature at different flow rates
The flow rate is determined according to the limitation of relevant standard specifications, and the principle is that the maximum flow velocity of the buried pipe, the maximum flow velocity limit of the buried pipe, the economic ratio friction resistance range and the transmission energy consumption ratio are limited, the flow velocity of the buried pipe and the economic ratio friction resistance are considered according to a heating system, according to technical measures for national civil building engineering design (2009) of heating, ventilation and air conditioning, and civil building heating, ventilation and air conditioning design specifications GB50736-2012, the maximum flow velocity of a general occasion is considered to be 2m/s, and table 1 is the flow rate and the specific friction resistance of the water inlet pipe and the water outlet pipe at different flow velocities, the size of the coaxial sleeve deep buried pipe is that the outer sleeve is phi 177.8 × 9.19.19 mm (the outer diameter of the pipe is × wall thickness), and the inner sleeve is 114 × 76mm (the outer diameter of the inner diameter of the outer pipe is ×).
TABLE 1 circulation water flow rate of coaxial sleeve pipe buried deep pipe and specific friction resistance of water inlet pipe and water outlet pipe buried pipe
Wherein, comparing several working conditions under the precondition that the economic specific friction resistance is 30-120Pa/m and the maximum specific friction resistance (maximum 300Pa/m) is limited, when the flow speed of an inlet (annular area) is less than 0.6m/s, the specific friction resistance in the conduit meets the requirement of being less than the maximum value; when the flow velocity at the inlet (annular region) was 0.3m/s, the specific friction of the annular cross section was 28.1Pa/m, which was less than 30 Pa/m. Therefore, three working conditions (working conditions 4, 5 and 6), namely the conditions that the flow velocity at the annular area (namely the inlet) is 0.6m/s, 0.5m/s and 0.4m/s respectively, are selected as experimental working conditions; flow rates of 21.07m, respectively3/h、17.56m3/h、14.05m3/h。
② open cycle at constant flow rate at different inlet water temperatures
After the circulating water quantity of the open system is determined, the influence of the water temperature at the inlet of the buried pipe on the heat exchange performance of the sleeve type deep buried pipe heat exchange system is determined by changing different constant inlet water temperatures.
According to the common water supply and return temperature of the buried pipe and the water temperature condition of the buried pipe inlet which is possibly generated in the running process of the system in the actual engineering, three inlet water temperatures are designed, wherein the three inlet water temperatures are respectively 7 ℃, 12 ℃ and 17 ℃; the flow rate is 17.56m3H, (exit flow rate 1.075m/s, entry flow rate 0.5 m/s).
③ closed cycle with constant flow rate at different constant heat extraction
The purpose of the experiment is to observe the temperature of the supply water and the return water of the buried pipe when the heat exchange system of the deep buried pipe is set with different heat taking quantities under the conventional constant flow rateThe characteristic of the variation. Wherein the flow rate of the buried pipe is selected to be 17.56m3/h。
Through the analysis of the U-shaped pipe buried pipe of the engineering, the heat is taken and divided into three working conditions of 0.65MW, 0.55MW and 0.45MW, and the working conditions are selected to be 0.35MW, 0.25MW and 0.15MW by reference.
In the experiment, according to heat pump set's performance, can further strengthen the heat extraction, increase an experiment operating mode.
④ closed cycle with constant flow rate and constant heat extraction for different experiments
Selected intermediate flow rate of 17.56m3And h, the intermediate heat extraction is 0.25MW, the operation is carried out for 120h, and the change of the inlet water temperature and the outlet water temperature is observed for 72h to 120 h.
The experimental conditions of the same depth (2500m) are set above. In the experiment, proper adjustment and supplement can be carried out according to the needs under the conditions of feasible technology and safe pipe network system.
⑤ open cycle with constant inlet temperature and varying depth
For the open cycle with constant flow rate at different water inlet temperatures, the inlet water temperature is selected to be 12 ℃ and the flow rate is selected to be 17.56m3And under the work condition of/h, the buried pipe depth is respectively changed into 2000m and 1500m, the change of the water temperature at the outlet of the buried pipe is observed, and then the change of different buried pipe heat exchange performances under the condition of constant water inlet temperature is obtained.
⑥ length of time during which the outlet temperature of a buried pipe tends to stabilize at a constant inlet temperature
Three flow rates, three temperatures and three heat taking amounts which are set in the experiment and different experiment time lengths and depths are explained, and the time length for which the temperature of the outlet of the buried pipe tends to be stable under the constant inlet temperature is determined in a modeling and numerical simulation mode, so that the experiment time is favorably shortened.
When the system starts to operate, the water temperature changes greatly from high to low, and the temperature reduction changes steadily after a period of time. According to the geotechnical thermal response experimental requirement of ground source heat pump system engineering technical specification GB 50366-2005(2009 edition), the temperature tends to be stable, and the difference between the front temperature and the rear temperature of the outlet water of the buried pipe is not more than 1 ℃ in 12 hours. For the experiment of the heat exchange performance of the deep buried pipe, the stable concept of the shallow buried pipe is used for reference, so that the running time required for achieving the stability can be determined, and the running time is used as the most basic running time required by each working condition.
The constant inlet water temperature was set at 7 deg.C, the inlet flow rate was 0.5m/s, and the flow rate was 17.56m3And/h, simulating 240-hour operation by using a numerical value, and obtaining a change curve of the outlet water temperature of the buried pipe as shown in figure 2. As can be seen from FIG. 2, the temperature of the effluent water decreases rapidly several hours before the operation, and then gradually decreases as the operation time increases. The temperature data for the 57 hours of operation was compared to the temperature data for the 45 hours of operation at a difference of 0.982 c and less than 1 c, which reflects that steady state was reached by the 57 hours of operation. Since the working condition that the inlet temperature is 7 ℃ is adopted, the theoretical most unfavorable working condition is adopted, so the conclusion can be also applied to other working conditions with relatively high inlet temperature.
⑦ recovery time of soil temperature
It can be seen from the 5 working conditions with different running time lengths that the longer the running time is, the longer the rock and soil recovery time is, see table 2. The length of recovery in the experiment can be considered as 15 days.
TABLE 2 temperature recovery rate after shutdown for each operating duration
| Running time (h) | The recovery rate becomes slow for a long time (day) | Days of outage-recovery greater than | Days of outage-recovery greater than |
| 57 | 4 | 7-90％ | 12-94％ |
| 72 | 5 | 8-90％ | 14.5-94％ |
| 84 | 5 | 8.5-90％ | 15-93.9％ |
| 96 | 5 | 9.5-90％ | 15-93％ |
| 120 | 6 | 11.5-90％ | 15-92％ |
The above is the prediction of the stable operation duration and the recovery duration obtained by analysis using a numerical calculation method. It is recommended that in the experiment, the real-time monitoring values of the water temperature of the inlet and the outlet of the buried pipe and the temperature of the pipe wall are combined to carry out proper adjustment.
⑧ experimental condition design
The operation time and the recovery time listed in tables 3-6 are only used as references, and the real-time monitoring values of the inlet temperature and the outlet temperature of the buried pipe and the temperature of the vertical pipe wall can be adjusted in the actual operation; the experimental conditions (see tables 3-6) are analyzed and determined in the report, and appropriate adjustment and supplementation can be performed according to needs under the conditions that the technology is feasible and the safety of a pipe network system is ensured in the experiment. The recovery time is considered as 15 days, and the total time required for 12 experimental conditions is expected to be 5232h (218 days).
Table 3 experimental combination design of open system of casing type deep-buried well: experiment 1 (constant inlet water temperature different flow rate)
Table 4 experimental combination design of open system of casing type deep-buried well: experiment 2 (constant flow rate different inlet water temperature)
Table 5 experimental combination design of closed system of casing type deep-buried well: experiment 3 (constant flow rate different heat extraction, including different duration)
Table 6 experimental combination design of open system of casing type deep-buried well: experiment 4 (constant inlet temperature different depth)
(2) Opening a valve of a buffer water tank in a heat exchange test system schematic diagram, adjusting the valve to an open mode, controlling the inlet temperature to be stabilized at 12 ℃ through a cold and hot water unit, ensuring the constant temperature of the buffer water tank (needing external heat preservation), controlling the inlet end flow through a water pump 14, and firstly adjusting the inlet end flow to be 14.05m according to the requirements of experimental design3The operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 21.17m3The operation time is 72h, and the recovery time is 360 h; adjusting a proper flow according to the field operation condition, wherein the operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 17.56m3The operation time is 72h, and the recovery time is 360 h; and recording the pressure, temperature, flow and heat taking data in the testing process in the whole process.
(3) Buffer water tank valve in heat exchange test system schematic diagramThe opening is kept to the open mode, and the inlet flow is controlled to be stable at 17.56m by the inlet water pump 143Controlling inlet temperature change by using a cold and hot water unit, controlling outlet water temperature of the heat pump unit, ensuring constant temperature of the buffer water tank (needing external heat preservation), firstly adjusting the inlet temperature to 7 ℃, operating time to 72h, and recovery time to 360 h; adjusting the inlet temperature to 17 ℃, operating time to 72h and recovery time to 360 h; and recording the pressure, temperature, flow and heat taking data in the testing process in the whole process.
(4) The valve of the buffer water tank in the heat exchange test system schematic diagram is closed and adjusted to be in a closed mode, and the inlet flow is controlled to be 17.56m stably through the inlet water pump 143The heating and cooling water unit is used for controlling the change of the heat quantity, the heat quantity is adjusted to be 0.15MW, the running time is 72 hours, and the recovery time is 360 hours; adjusting the heat to 0.35MW, running time of 72h and recovery time of 360 h; adjusting a proper heat extraction amount according to the field condition, wherein the operation time is 72h, and the recovery time is 360 h; adjusting the heat to 0.25MW, operating time of 120h and recovery time of 360 h; and recording the pressure, temperature, flow and heat taking data in the testing process in the whole process.
(5) The valve opening of the buffer water tank in the heat exchange test system schematic diagram is adjusted to be in an open mode, and the inlet flow is controlled to be 17.56m stably by the inlet water pump 143Controlling the inlet temperature to be stabilized at 12 ℃ through a cold and hot water unit, ensuring the temperature of the buffer water tank to be constant (needing external heat preservation), lifting the depth of an inner pipe of the middle-deep concentric sleeve type heat exchange device to 2000m, operating time to be 72h, and recovery time to be 360 h; the depth of an inner tube of the middle-deep concentric sleeve type heat exchange device is increased to 1500m, the running time is 72h, and the recovery time is 360 h; and recording the pressure, temperature, flow and heat taking data in the testing process in the whole process.
The invention tests both an open mode and a closed mode, wherein the open mode reflects the heat extraction of the heat exchange device, and the closed mode reflects the operation condition under the mode of simulating constant heat extraction of a user.
Claims (2)
1. A performance testing device for a middle-deep concentric sleeve type heat exchanger is characterized by comprising distributed metal armored optical cable temperature measuring equipment (3), an optical fiber temperature measuring data collector (4), a check valve (12), a water pump (14), a high-level water tank (18), a Y-shaped filter (19), a heat meter (22), a buffer water tank (27), a dosing device (36), a first cold and hot water unit (39) and a second cold and hot water unit (49); wherein,
during testing, the test device also comprises a middle-deep concentric sleeve type heat exchanger outer sleeve (1) and a middle-deep concentric sleeve type heat exchanger inner tube (2), wherein the middle-deep concentric sleeve type heat exchanger inner tube (2) is sleeved in the middle-deep concentric sleeve type heat exchanger outer sleeve (1);
the distributed metal armored optical cable temperature measuring equipment (3) is fixed and tightly attached to the outer wall of the outer sleeve (1) of the middle-deep layer concentric sleeve heat exchanger through an optical fiber protector and a strapping tape, the ground part of the optical cable is connected with an optical fiber temperature measuring data collector (4), and one data is recorded every meter and every minute; an outlet of an outer sleeve (1) of the middle-deep concentric sleeve type heat exchanger is communicated with an inlet of an inner tube (2) of the middle-deep concentric sleeve type heat exchanger, an outlet of the inner tube (2) of the middle-deep concentric sleeve type heat exchanger is connected with an inlet of a Y-shaped filter (19), an outlet of the Y-shaped filter (19) is connected with an inlet of a heat meter (22), an outlet of the heat meter (22) is connected with an inlet of a first cold and hot water unit (39) and an inlet of a second cold and hot water unit (49), an outlet of the first cold and hot water unit (39) and an outlet of the second cold and hot water unit (49) are both connected with an inlet of a buffer water tank (27), and an outlet of the buffer water tank (27) is connected, meanwhile, the outlet of the dosing device (36) is connected with the inlet of the water pump (14), and the outlet of the water pump (14) is connected with the inlet of the outer sleeve (1) of the middle-deep concentric sleeve type heat exchanger; the outlet of the high-level water tank (18) is connected with the outlet of the buffer water tank (27) and is used for supplementing the loss of water circulation of the device;
a first pressure sensor (5), a first temperature sensor (6), a first flow sensor (7), a tenth metal hard sealing butterfly valve (55) and an exhaust valve (17) are sequentially arranged on a pipeline connecting an outlet of an inner pipe (2) of the middle-deep concentric double-pipe heat exchanger with an inlet of a Y-shaped filter (19);
a third temperature sensor (20) and a third flow sensor (21) are arranged on a pipeline connecting the outlet of the Y-shaped filter (19) and the inlet of the heat meter (22);
a third pressure sensor (23), a sixth metal hard sealing butterfly valve (41), a seventh temperature sensor (37) and a third flexible joint (38) are arranged on a pipeline connecting an outlet of the heat meter (22) and an inlet of the first cold and hot water unit (39);
a pipeline connecting the outlet of the heat meter (22) and the inlet of the second cold and hot water unit (49) is provided with a third pressure sensor (23), an eighth metal hard sealing butterfly valve (47), a ninth temperature sensor (46) and a seventh flexible joint (48);
a pipeline connecting the outlet of the first cold and hot water unit (39) and the inlet of the buffer water tank (27) is provided with a fifth flexible joint (43), an eighth temperature sensor (45), a seventh metal hard seal butterfly valve (42), a fifth pressure sensor (28) and a fourth metal hard seal butterfly valve (29);
a ninth flexible joint (52), a tenth temperature sensor (54), a ninth metal hard sealing butterfly valve (51), a fifth pressure sensor (28) and a fourth metal hard sealing butterfly valve (29) are arranged on a pipeline connecting an outlet of the second cold and hot water unit (49) and an inlet of the buffer water tank (27);
a fifth temperature sensor (30) and a sixth temperature sensor (31) are arranged on the buffer water tank (27), the outlet and the inlet of the buffer water tank (27) are connected through a pipeline, and a fifth metal hard sealing butterfly valve (32) is arranged on the pipeline;
a pipeline connecting the outlet of the buffer water tank (27) and the inlet of the water pump (14) is provided with a third metal hard seal butterfly valve (26), a fourth pressure sensor (25), a fourth temperature sensor (24), a second metal hard seal butterfly valve (16) and a second flexible joint (15);
the dosing device (36) comprises a dosing tank, and a second flanged valve (35), a metering pump (34) and a first flanged valve (33) are arranged on a pipeline connecting an outlet of the dosing tank with an inlet of the water pump (14);
a first flexible joint (13), a check valve (12), a first metal hard sealing butterfly valve (11), a second flow sensor (10), a second temperature sensor (9) and a second pressure sensor (8) are arranged on a pipeline connecting an outlet of the water pump (14) and an inlet of the outer sleeve (1) of the middle-deep concentric sleeve type heat exchanger;
the first cold and hot water unit (39) forms a circulation loop through a fourth flexible joint (40) and a sixth flexible joint (44), and the second cold and hot water unit (49) forms a circulation loop through an eighth flexible joint (50) and a tenth flexible joint (53).
2. A performance test method of a deep concentric double pipe heat exchanger, which is based on the performance test device of claim 1, and comprises the following steps:
1) before the test is started, a fifth metal hard sealing butterfly valve (32) is ensured to be in a closed state, a third metal hard sealing butterfly valve (26) and a fourth metal hard sealing butterfly valve (29) at two ends of a buffer water tank (27) are in an open state, a first cold and hot water unit (39) is started to keep the water temperature at 12 ℃, a water pump (14) is started, and according to the requirements of experimental design, the flow at the inlet end is firstly adjusted to be 14.05m3The operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 21.17m3The operation time is 72h, and the recovery time is 360 h; adjusting a proper flow according to the field operation condition, wherein the operation time is 72h, and the recovery time is 360 h; the inlet end flow is adjusted to 17.56m3The operation time is 72h, and the recovery time is 360 h; testing the heat exchange performance of the deep concentric double-pipe heat exchanger through the change of the flow, and monitoring the formation temperature in the recovery process to master the earth temperature recovery rule;
2) the third metal hard seal butterfly valve (26) and the fourth metal hard seal butterfly valve (29) at the two ends of the buffer water tank (27) are still opened and kept in an open mode, and the inlet flow is controlled to be stable to 17.56m by starting the water pump (14)3The first cold and hot water unit (39) is started to control the inlet temperature change, the inlet temperature is adjusted to 7 ℃, the running time is 72 hours, and the recovery time is 360 hours; adjusting the inlet temperature to 17 ℃, operating time to 72h and recovery time to 360 h; by testing the variation of inlet temperatureThe heat exchange performance of the middle-deep concentric sleeve type heat exchanger masters the earth temperature recovery rule through monitoring the formation temperature in the recovery process;
3) the third metal hard seal butterfly valve (26) and the fourth metal hard seal butterfly valve (29) at the two ends of the buffer water tank (27) are closed, the opening state of the fifth metal hard seal butterfly valve (32) is adjusted to a closed mode, the water pump (14) is started, and the inlet flow is controlled to be stable at 17.56m3The first cold and hot water unit (39) is started, the heat is adjusted to be 0.15MW, the running time is 72h, and the recovery time is 360 h; adjusting the heat to 0.35MW, running time of 72h and recovery time of 360 h; adjusting a proper heat extraction amount according to the field condition, wherein the operation time is 72h, and the recovery time is 360 h; adjusting the heat to 0.25MW, operating time of 120h and recovery time of 360 h; testing the heat exchange performance of the U-shaped well heat exchanger in the middle and deep layers through the change of heat quantity and different running time lengths, and mastering the earth temperature recovery rule through monitoring the formation temperature in the recovery process;
4) a third metal hard seal butterfly valve (26) and a fourth metal hard seal butterfly valve (29) at two ends of the buffer water tank (27) are opened, a fifth metal hard seal butterfly valve (32) is closed and adjusted to an open mode, a water pump (14) is started, and the flow of a control inlet is stabilized to be 17.56m3Starting a first cold and hot water unit (39), controlling the inlet temperature to be stable at 12 ℃, ensuring the temperature of the buffer water tank to be constant, lifting the depth of an inner tube (2) of the middle-deep concentric double-tube heat exchanger to 2000m, operating the time for 72h, and recovering the time for 360 h; the depth of an inner tube (2) of the middle-deep concentric double-tube heat exchanger is increased to 1500m, the running time is 72h, and the recovery time is 360 h; the heat exchange performance of the middle-deep U-shaped well type heat exchanger is tested through the change of the depth of the buried pipe, and the earth temperature recovery rule is mastered through monitoring the formation temperature in the recovery process.
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