阅读说明：本技术 一种冰浆-海水两相流换热实验台 (Ice slurry-seawater two-phase flow heat exchange experiment table ) 是由 徐立 陶铖 任立波 黄长绪 孙强 陈海文 杜鹏程 张诗洁 于 2018-06-05 设计创作，主要内容包括：本发明公开了一种冰浆-海水两相流换热实验台,由制冰系统、动力系统、控制系统和测试系统组成,所述制冰系统包括制冰机、冰浆槽和海水储存罐,所述制冰机的入口与海水储存罐连通,制冰机的出口位于冰浆槽的上方；所述动力系统包括砂浆泵,砂浆泵的入口与制冰系统连通,具体与制冰系统的冰浆槽连通；砂浆泵的出口与调节系统连通；所述测试系统包括测试管路、激振装置和电源,所述测试管路两端分别与调节系统连通；测试管路设有测试段,测试段穿过管路外壳,管路外壳安装于激振装置上。本发明的有益效果为：本发明设置激振装置,可模拟船舶在行驶时受到的振动,给与实验软管一定的振幅,实验工况与实际情况更接近,保证了实验的准确性,提高了实验结果的可信度。(the invention discloses an ice slurry-seawater two-phase flow heat exchange experiment table, which consists of an ice making system, a power system, a control system and a test system, wherein the ice making system comprises an ice making machine, an ice slurry tank and a seawater storage tank, the inlet of the ice making machine is communicated with the seawater storage tank, and the outlet of the ice making machine is positioned above the ice slurry tank; the power system comprises a mortar pump, and an inlet of the mortar pump is communicated with the ice making system, particularly an ice slurry groove of the ice making system; the outlet of the mortar pump is communicated with the adjusting system; the test system comprises a test pipeline, an excitation device and a power supply, and two ends of the test pipeline are respectively communicated with the adjusting system; the test pipeline is provided with a test section, the test section penetrates through the pipeline shell, and the pipeline shell is installed on the excitation device. The invention has the beneficial effects that: the invention is provided with the excitation device, can simulate the vibration of the ship when the ship runs, gives a certain amplitude to the experiment hose, ensures the experiment accuracy and improves the reliability of the experiment result, and the experiment working condition is closer to the actual condition.)

1. The ice slurry-seawater two-phase flow heat exchange experiment table is characterized by comprising an ice making system, a power system, a control system and a test system, wherein the ice making system comprises an ice making machine, an ice slurry tank and a seawater storage tank, an inlet of the ice making machine is communicated with the seawater storage tank, and an outlet of the ice making machine is positioned above the ice slurry tank; the power system comprises a mortar pump, and an inlet of the mortar pump is communicated with the ice making system, particularly an ice slurry groove of the ice making system; the outlet of the mortar pump is communicated with the adjusting system; the test system comprises a test pipeline, an excitation device and a power supply, and two ends of the test pipeline are respectively communicated with the adjusting system; the test pipeline is provided with a test section, the test section penetrates through a pipeline shell, the pipeline shell is installed on the excitation device, the test shell is connected with a power supply in parallel, and the test shell is connected with the adjusting system through a paperless recorder.

2. The two-phase flow heat exchange experiment table for ice slurry-seawater according to claim 1, wherein the adjusting system comprises an adjusting main pipe and an electromagnetic flow meter, the electromagnetic flow meter is arranged at one end of the adjusting main pipe, the adjusting main pipe is communicated with one end of the testing pipeline through the electromagnetic flow meter, and the electromagnetic flow meter is connected with a paperless recorder of the testing system; the other end of the adjusting main pipe is communicated with the other end of the testing pipeline through a glass pipe on the adjusting main pipe; the adjusting main pipe is communicated with an outlet of the mortar pump through a pipeline at a connecting point A, and is communicated with the ice slurry groove through a pipeline at a connecting point B; and a first regulating valve and a second regulating valve are sequentially arranged on the regulating main pipe between the connecting point A and the connecting point B.

3. The two-phase flow heat exchange bench for ice slurry-seawater as claimed in claim 2, wherein a third regulating valve and a material-taking and discharging valve are sequentially arranged on the regulating main pipe between the connection point B and the organic glass pipe.

4. The two-phase flow heat exchange bench for ice slurry-seawater according to claim 2, wherein one end of the test pipeline is communicated with the glass tube, and the other end of the test pipeline is respectively communicated with the drain pipe and the electromagnetic flowmeter.

5. The ice slurry-seawater two-phase flow heat exchange laboratory bench of claim 4, wherein the test section of the test pipeline is connected in parallel with a differential pressure transducer, and the differential pressure transducer is connected with a paperless recorder.

6. The ice slurry-seawater two-phase flow heat exchange laboratory bench of claim 1, wherein both ends of the test section of the test pipeline are provided with thermal resistors.

7. the ice slurry-seawater two-phase flow heat exchange experiment table according to claim 1, wherein a silica gel sleeve is arranged outside the test section and penetrates through a pipeline shell.

8. The ice slurry-seawater two-phase flow heat exchange experiment table according to claim 6, wherein the outer wall of the silica gel sleeve is attached to the inner wall of the pipeline shell.

9. The ice slurry-seawater two-phase flow heat exchange laboratory bench of claim 1, wherein the power supply is a regulated dc power supply.

Technical Field

The invention relates to a two-phase flow heat exchange experiment bench, in particular to an ice slurry-seawater two-phase flow heat exchange experiment bench.

Background

Ice slurry-seawater two-phase flow heat exchange is common in polar ships. When the polar region ship runs in the polar region, broken ice enters a ship seawater pipeline system and is continuously accumulated in the ship seawater pipeline system to form blockage, so that a ship seawater cooling system is paralyzed, the temperature of cooling water is rapidly increased to exceed the normal running temperature range, ship equipment cannot normally work, and finally the whole ship power system cannot run. Therefore, it is necessary to discuss the change rule of the heat exchange coefficient of the cold and hot fluid in the cooling system in the polar region ship operation process, and provide reference for solving the problem of crushed ice blockage in the current ship seawater pipeline system.

Disclosure of Invention

The invention aims to provide an ice slurry-seawater two-phase flow heat exchange experiment bench aiming at the defects of the prior art, so as to simulate the running condition when ice slurry is mixed into a cold fluid pipeline of a polar ship plate type heat exchanger, carry out temperature, flow control and regulation, find out the law of the change of the two-phase flow heat exchange coefficient and solve the problem that broken ice enters a cooling system to cause the paralysis of the cooling system in the prior art.

the technical scheme adopted by the invention is as follows: an ice slurry-seawater two-phase flow heat exchange experiment table comprises an ice making system, a power system, a control system and a test system, wherein the ice making system comprises an ice making machine, an ice slurry tank and a seawater storage tank, an inlet of the ice making machine is communicated with the seawater storage tank, and an outlet of the ice making machine is positioned above the ice slurry tank; the power system comprises a mortar pump, and an inlet of the mortar pump is communicated with the ice making system, particularly an ice slurry groove of the ice making system; the outlet of the mortar pump is communicated with the adjusting system; the test system comprises a test pipeline, an excitation device and a power supply, and two ends of the test pipeline are respectively communicated with the adjusting system; the test pipeline is provided with a test section, the test section penetrates through the pipeline shell, and the pipeline shell is arranged on the excitation device; the test shell is connected with a power supply in parallel and is connected with the regulating system through the paperless recorder.

According to the scheme, the adjusting system comprises an adjusting main pipe and an electromagnetic flowmeter, wherein the electromagnetic flowmeter is arranged at one end of the adjusting main pipe, the adjusting main pipe is communicated with one end of the testing pipeline through the electromagnetic flowmeter, and the electromagnetic flowmeter is connected with a paperless recorder of the testing system; the other end of the adjusting main pipe is communicated with the other end of the testing pipeline through a glass pipe on the adjusting main pipe; the adjusting main pipe is communicated with an outlet of the mortar pump through a pipeline at a connecting point A, and is communicated with the ice slurry groove through a pipeline at a connecting point B; and a first regulating valve and a second regulating valve are sequentially arranged on the regulating main pipe between the connecting point A and the connecting point B.

According to the scheme, the third regulating valve and the material taking and discharging valve are sequentially arranged on the regulating main pipe between the connecting point B and the organic glass pipe.

According to the scheme, one end of the test pipeline is communicated with the glass tube, and the other end of the test pipeline is communicated with the drain pipe and the electromagnetic flowmeter respectively.

According to the scheme, the test section of the test pipeline is connected with the differential pressure transformer in parallel, and the differential pressure transformer is connected with the paperless recorder.

According to the scheme, thermal resistors are arranged at two ends of the test section of the test pipeline.

According to the scheme, the test section is externally provided with the silica gel sleeve and then penetrates through the pipeline shell.

According to the scheme, the outer wall of the silica gel sleeve is attached to the inner wall of the pipeline shell.

According to the scheme, the power supply is a voltage-stabilizing direct-current power supply.

The invention has the beneficial effects that:

1. The invention is provided with the excitation device, so that the vibration of the ship during running can be simulated, a certain amplitude is given to the experiment hose, the experiment working condition is closer to the actual condition, the accuracy of the experiment is ensured, and the reliability of the experiment result is improved;

2. The voltage-stabilized direct-current power supply outputs direct current with high quality and controllable voltage, so that the current of the heating section of the pipeline shell is uniform, and the heating section is ensured to have the same heating efficiency;

3. The adjusting system is provided with three adjusting valves for matching adjustment, and the design can accurately adjust the flow and save the cost of experimental equipment;

4. The water discharged from the outlet end of the test hose can directly flow back to the seawater storage tank for recycling; meanwhile, the reflux design is also beneficial to cleaning the device;

5. The outer parcel silica gel cover of test section and between the outer wall of silica gel cover and the inner wall of pipeline shell seamless can effectively prevent thermal loss, increases the reliability of experiment.

6. The invention has reasonable design, good feasibility and high reliability.

Drawings

FIG. 1 is a general schematic diagram of one embodiment of the present invention.

FIG. 2 is an overall view of a test section tube of the present invention.

FIG. 3 is a cross-sectional view of a test section of the present invention.

In the figure: 1-an ice maker; 2-a mortar pump; 3-ice slurry tank; 4-a hose; 5, a drain pipe; 6-an electromagnetic flow meter; 7-a first regulating valve; 8-a second regulating valve; 9-a third regulating valve; 10-a take-off and blowdown valve; 11-a glass tube; 12-a data line; 13-paperless recorder; 14-a power supply; 15-testing the pipeline; 16-a vibration excitation device; 17-a differential pressure transmitter; 18-a seawater storage tank; 19-a pipeline housing; 20-a test section; 21-silica gel sleeve; 22-stainless steel tube; 23-attachment point A; 24-attachment point B; 25-thermal resistance.

Detailed Description

For a better understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.

The ice slurry-seawater two-phase flow heat exchange experiment table shown in fig. 1 comprises an ice making system, a power system, a control system and a test system, wherein the ice making system comprises an ice maker 1, an ice slurry tank 3 and a seawater storage tank 18, an inlet of the ice maker 1 is communicated with the seawater storage tank 18, an outlet of the ice maker 1 is connected with an ice outlet pipeline, and an outlet of the ice outlet pipeline is positioned above the ice slurry tank 3. In this embodiment, the ice outlet pipe is a hose; when the ice maker 1 is started, seawater in the seawater storage tank 18 enters the ice maker 1, and ice slurry prepared by the ice maker 1 flows into the ice slurry tank 3 through the ice outlet pipeline to be stored.

the power system comprises a mortar pump 2, and an inlet of the mortar pump 2 is communicated with the ice making system, particularly an ice slurry groove 3 of the ice making system; the outlet of the mortar pump 2 is communicated with the adjusting system; the mortar pump 2 can effectively reduce the corrosion of the ice slurry to the pump and the heating of the external environment to the ice slurry in the pump.

The adjusting system comprises an adjusting main pipe and an electromagnetic flowmeter 6, the electromagnetic flowmeter 6 is arranged at one end of the adjusting main pipe, the adjusting main pipe is communicated with one end of the testing system through the electromagnetic flowmeter 6, and the electromagnetic flowmeter 6 is electrically connected with the testing system; the other end of the adjusting main pipe is communicated with the other end of the testing system through a glass pipe 11 (which can be an organic glass pipe and is used for observing the flowing condition of ice slurry in the pipeline); the adjusting main pipe is communicated with the outlet of the mortar pump 2 through a pipeline at a connecting point A23, and is communicated with the ice slurry groove 3 through a pipeline at a connecting point B24; a first regulating valve 7 and a second regulating valve 8 are sequentially arranged on the regulating main pipe between the connecting point A23 and the connecting point B24; a third regulating valve 9 and a material taking and discharging valve 10 are sequentially arranged on the regulating main pipe between the connecting point B24 and the glass pipe 11 (which can be a plexiglass pipe). At the beginning, the first regulating valve 7 or the second regulating valve 8 is in a complete opening state, and the third regulating valve 9 is gradually opened until the flow in the test system reaches the set experimental flow; if the third regulating valve 9 is in the fully opened state and the flow in the test system does not reach the set experimental flow, the opening degree of the first regulating valve 7 or the second regulating valve 8 needs to be gradually reduced.

the test system comprises a test pipeline 15 (which can be a hose), an excitation device 16 and a power supply 14, wherein the test pipeline 15 is provided with a test section 20, the test section 20 is externally provided with a silica gel sleeve 21 and then penetrates through a pipeline shell 19, as shown in fig. 2 and 3 (no gap exists between the outer wall of the silica gel sleeve 21 and the inner wall of the pipeline shell 19), and the pipeline shell 19 is arranged on the excitation device 16; two ends of a test pipeline 15 of the test system are respectively communicated with the regulating system, specifically, one end of the test pipeline 15 is communicated with the glass tube 11, and the other end of the test pipeline 25 is respectively communicated with the drain pipe 5 and the electromagnetic flowmeter 6; the test housing 19 is connected to the power supply 14; the thermal resistor 25 installed at the front and rear ends of the test section 20 is connected to the paperless recorder 13, and the paperless recorder 13 is connected to the electromagnetic flowmeter 6 through the data line 12. Preferably, the test section 20 of the test line 15 is connected in parallel with a differential pressure transmitter 17, and the differential pressure transmitter 17 is used to measure the pressure drop of the fluid in the test section 20. Differential pressure transmitter 17 transmits data to paperless recorder 13 via data line 12. The thermal resistor 25 measures the heat flux density of the fluid in the test section 20 and the data is displayed on the paperless recorder 13. In this embodiment, the power supply 14 is a voltage-stabilized dc power supply, and is configured to heat the test section 20 of the test pipeline 15, the voltage-stabilized dc power supply can output dc power with high quality voltage, and output current and voltage are controllable, so that current at any position of the test section 20 in the pipeline housing 19 is uniform, and any local part is guaranteed to have the same heating efficiency, and heat is transferred through the silica gel sleeve 21 between the pipeline housing 19 and the test section 20, which not only conducts heat, but also fills a gap between the two to prevent heat loss, thereby avoiding uneven heating; the excitation device 16 is started to simulate the vibration of the ship during running, and quantitative amplitude is added to the test pipeline 15; the paperless recorder 8 records the relative parameters of the warm fluid density, pressure drop, flow rate, etc. in the test section 20.

in this embodiment, the outside of the pipeline of the whole system is wrapped and sealed by a material with good heat insulation, such as sponge, so that heat is locked in the pipeline as much as possible, and the heat is prevented from being dissipated too fast.

The working principle of the invention is as follows: the seawater in the seawater storage tank 18 enters the ice maker 1 to make ice, and ice slurry made by the ice maker 1 falls into the ice slurry tank 3 to be stored; the mortar pump 2 is started, seawater ice slurry is conveyed to the test pipeline 15, and the seawater ice slurry flows back to the ice slurry tank 3 through circulation of the adjusting main pipe; the flow of ice slurry in the test pipeline 15 is adjusted through a control system, the power supply 14 is used for heating the pipeline shell 19, and the paperless recorder 8 records the flow body temperature and heat flow density, pressure drop, flow and other related parameters in the test pipeline 15; and starting the vibration excitation device 16, adding quantitative amplitude to the test pipeline 15, and recording related parameters under different amplitudes by the paperless recorder 8.

In the present invention, the heat transfer coefficient of the test section 20 is calculated using the following formula:

h_loc＝q/(T_w－T_m,f)；q＝Q/(S×t)

In the formula, q is the heat flux of the pipe wall of the test section 20, and w/m²(ii) a Q is the heat provided by the DC power supply, J; t is time, s; s is the area of the cross section of the pipeline, m²；T_wIs the wall temperature, deg.C, of the test section 20; t is_m,fThe average fluid temperature of the seawater-ice crystal two-phase flow on the cross-sectional area of the test section 20 is obtained by measuring the average value at a plurality of times by two thermal resistors 20 in front of and behind the test section 20.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the embodiments, it will be apparent to those skilled in the art that modifications can be made to the technical solutions described in the above-mentioned embodiments, or equivalent substitutions of some technical features, but any modifications, equivalents, improvements and the like within the spirit and principle of the present invention shall be included in the protection scope of the present invention.