CN-121994518-A - Device and method for boiling and condensing heat exchange at high temperature outside working medium pipe

CN121994518ACN 121994518 ACN121994518 ACN 121994518ACN-121994518-A

Abstract

The device comprises a working medium circulating system, a cooling circulating system and a hot water circulating system, and when the device works, the cooling circulating system and the hot water circulating system can exchange heat media in the working medium circulating system, so that the media are changed into steam to rise, then the steam is condensed and flows back, and the heat exchange condition is simulated. The heat source disclosed by the invention is capable of completing working medium circulation by means of the height difference of the evaporator and the condenser, avoiding power devices such as a compressor or a shielding pump, and the like, is low in construction cost, can simulate the heat exchange state of boiling and condensation outside a working medium pipe under different working conditions, is convenient to adjust the working conditions, is convenient to construct, is capable of simulating the heat exchange condition of an actual engineering heat exchange pipe by means of convection heat transfer of hot water in the pipe, and is compared with a test system adopting an electric heating pipe to provide heat.

Inventors

ZHANG JINGLONG
Lian Tiancheng
CUI YU
LIU LIANGDE
Fan Mengfang

Assignees

中国石油工程建设有限公司
中国石油天然气集团有限公司

Dates

Publication Date: 20260508
Application Date: 20241106

Claims (11)

1. The utility model provides a working medium outside pipe high temperature position boiling and condensation heat transfer device which characterized in that includes: The working medium circulation system comprises an evaporator shell (1) and a condenser shell (2) with height difference, wherein the evaporator shell (1) is positioned below the condenser shell (2), and a steam pipe (3) and a return pipe (4) are connected between the evaporator shell (1) and the condenser shell (2); The cooling circulation system comprises an electric heating wire (22) and a condensation heat exchange tube (26), wherein the condensation heat exchange tube (26) is arranged in the middle area of the condenser shell (2), and the electric heating wire (22) is positioned at the bottom of the cooling circulation system; The hot water circulation system comprises an evaporation heat exchange tube (17), wherein the evaporation heat exchange tube (17) is arranged in the evaporator shell (1).
2. The heat exchange device for boiling and condensing at high temperature outside a working medium pipe according to claim 1, wherein in the working medium circulation system, a plurality of temperature sensors (5) are arranged on the upper surface and the lower surface of the evaporator shell (1), and a pressure sensor (6) is arranged in the center of the upper surface and used for acquiring pressure data and temperature data of the evaporator shell (1) in real time; the condenser is characterized in that a plurality of temperature sensors (5) are arranged on the upper surface of the condenser shell (2), and a pressure sensor (6) is arranged in the center of the upper surface and used for acquiring pressure data and temperature data of the condenser shell (2) in real time.
3. The high-temperature boiling and condensing heat exchange device outside a working medium pipe according to claim 1, wherein in the working medium circulating system, an evaporation window (8) is further arranged at a position corresponding to the evaporation heat exchange pipe (17) on the surface of the evaporator shell (1), and the evaporation window (8) is used for observing the evaporation heat exchange pipe (17) inside the evaporator shell (1); the condenser is characterized in that a condensing window (7) is arranged on the surface of the condenser shell (2) at a position corresponding to the condensing heat exchange tube (26), and the condensing window (7) is used for observing the condensing heat exchange tube (26) inside the condenser shell (2).
4. The heat exchange device for boiling and condensing outside a working medium pipe at high temperature according to claim 1, wherein in the working medium circulating system, an organic working medium extraction port (28) is formed on one side of the lower surface of the evaporator shell (1), and an organic working medium charging port (27) is formed on the same side of the upper surface of the condenser shell (2).
5. The heat exchange device for boiling and condensing at high temperature outside a working medium pipe according to claim 1, wherein the heat exchange device comprises: The outlet of the evaporation heat exchange tube (17) is sequentially connected with a first flowmeter (12), a three-way valve (30), a plate heat exchanger (14), a hot water pump (9) and a hot water tank (15) along the water outlet direction through pipelines; The water outlet of the hot water tank (15) far away from the hot water pump (9) is connected with the inlet of the evaporation heat exchange tube (17) through a pipeline; the electric heating pipe (10) is arranged at the bottom of the hot water tank (15); The exhaust valve (11) is arranged at the top of the hot water tank (15); One end of a first heat exchange tube of the plate heat exchanger (14) is connected with the first flowmeter (12) through a pipeline, and the other end of the first heat exchange tube is connected with the hot water pump (9) through a pipeline; The outlet of the water supplementing pump (13) is connected with two branches, one branch is connected with a second heat exchange tube of the plate heat exchanger (14) through a pipeline, the other branch is connected to a three-way valve (30), and the inlet of the water supplementing pump (13) is connected with the cooling water tank (16) through a pipeline; An inlet of the cooling water tank (16) is connected with a second heat exchange tube of the plate heat exchanger (14) through a pipeline, and a through valve (29) is arranged on the pipeline; And the temperature sensors (5) are arranged on the pipelines at the inlet and outlet positions of the evaporation heat exchange tube (17).
6. The boiling and condensing heat exchange device for high temperature outside working medium according to claim 5, characterized in that in the hot water circulation system, the second heat exchange tube of the plate heat exchanger (14) and the water supplementing pump (13) are both communicated with a pipeline connected with the flowmeter (12).
7. The high-temperature boiling and condensing heat exchange device outside a working medium pipe according to claim 5, wherein the cooling circulation system comprises a refrigeration module and a water cooling module, wherein in the water cooling module, the outlet of the condensing heat exchange pipe (26) is sequentially communicated with a second flowmeter (12), a cold water tank (23) and a cold water pump (24) through pipelines along the medium flowing direction, and the pipelines at the inlet and outlet positions of the condensing heat exchange pipe (26) are provided with temperature sensors (5); The electric heating wire (22) is arranged at the bottom of the cold water tank (23); The outlet of the cold water pump (24) far away from the cold water tank (23) is connected with the inlet of the condensation heat exchange tube (26) through a pipeline; a surface cooler (25) is paved on a pipeline at the inlet of the cold water tank (23); The refrigerating module is used for refrigerating and exchanging heat with the water cooling module.
8. The heat exchange device for boiling and condensing at high temperature outside a working medium pipe according to claim 7, characterized in that an evaporation coil (18), a compressor (21) and a throttle valve (19) are connected in the refrigeration module in sequence along the flow direction of the medium; The evaporation coil (18) is positioned in the cold water tank (23), the inlet is connected with a throttle valve (19) through a pipeline, and the outlet is connected with a compressor (21) through a pipeline; The throttle valve (19) is positioned outside the cold water tank (23); the compressor (21) is positioned outside the cold water tank (23); a condensing coil (20) is paved on a pipeline between the throttle valve (19) and the compressor (21).
9. A testing method applied to the boiling and condensing heat exchange device of the working medium outside the pipe at high temperature according to any one of claims 5-8, comprising the following steps: The medium in the evaporation heat exchange tube (17) exchanges heat with the liquid in the evaporator shell (1), so that the liquid in the evaporator shell (1) is heated to generate steam; During the steam rising process, steam is led into the condenser shell (2) through the steam pipe (3); adjusting the medium in the condensing heat exchange tube (26) to a target temperature through a cooling circulation system, and simultaneously carrying out heat exchange on the medium with the target temperature and steam to cool the steam to form liquid; under the action of gravity, liquid is led out to the evaporator shell (1) through the return pipe (4).
10. A test method according to claim 9, characterized in that the heat exchange with the liquid in the evaporator housing (1) is performed by evaporating the medium in the heat exchange tube (17), comprising the steps of: Heating the medium in the evaporation heat exchange tube (17) through a hot water circulation system, and performing heat exchange and cooling if the temperature of the medium exceeds a target range until the temperature of the medium in the evaporation heat exchange tube (17) is in the target range; The heated medium is heat exchanged with the liquid in the evaporator housing (1) until the liquid is converted into vapor.
11. Test method according to claim 9, characterized in that the medium in the condensation heat exchange tube (26) is adjusted to a target temperature by means of a cooling circulation system, comprising the steps of: The medium in the condensation heat exchange tube (26) is heated in an auxiliary mode by the electric heating wire (22), and meanwhile, a refrigerating module in the cooling circulation system exchanges heat with the medium in the condensation heat exchange tube (26) until the temperature of the medium in the condensation heat exchange tube (26) is in a target range.

Description

Device and method for boiling and condensing heat exchange at high temperature outside working medium pipe Technical Field The disclosure belongs to the technical field of test equipment, and particularly relates to a device and a method for boiling and condensing heat exchange at a high temperature outside a working medium pipe. Background Pool boiling and condensation widely exist in various industrial fields, the types of organic working media are continuously updated and the types of reinforced pipes are continuously iterated under the background of global climate change, and the phase change heat exchange coefficients of the organic working media under different pipe types and different working conditions are accurately and simply measured, so that the method has important significance for heat exchanger development and improvement. In the prior art, in order to control the heat flux density conveniently, electric heating is often adopted as an input heat source for evaporation, for example, patent CN114544213B is an invention patent named as a test system and a method for measuring the boiling heat exchange coefficient of a working medium, the heat exchange device only can measure the boiling heat exchange coefficient outside a tube, can not simulate the actual heat exchange process of water flowing in the tube and the evaporation outside the tube of the working medium, and can not directly obtain the total heat exchange coefficient through experiments. The invention relates to a measuring device using water as a cold and heat source, such as a patent CN201710453004.9, named as a horizontal tube bundle and a single-tube external refrigeration working medium falling film evaporation, pool boiling and condensed phase heat exchange device, wherein the evaporation saturation temperature is between-10 ℃ and-20 ℃ and the condensation saturation temperature is between 30 ℃ and 50 ℃ under the test working condition, and the test working condition range is a refrigeration cycle low-temperature working condition, but cannot simultaneously meet the high-temperature working condition of an organic Rankine cycle. The prior heat exchange tube phase change experiment research is relatively deficient in heat exchange quantity measurement technology, the working condition adjustment range of the existing heat exchange device is small, equipment is complicated, debugging is difficult, especially, the heat exchange tube uses water as a medium for convection heat exchange, the physical process of boiling and condensing a high-temperature working medium outside the tube lacks corresponding measurement means, the deep and refined experiment research is seriously hindered, and a novel measurement device is urgently needed to be sought to solve the problem. Disclosure of Invention Aiming at the problems in the background technology, the invention provides a device and a method for boiling and condensing heat exchange at a high temperature outside a working medium pipe. In order to achieve the above object, the present disclosure adopts the following technical solutions: A boiling and condensing heat exchange device for a high temperature position outside a working medium pipe comprises: The working medium circulation system comprises an evaporator shell and a condenser shell, wherein the evaporator shell is provided with a height difference, the evaporator shell is positioned below the condenser shell, and a steam pipe and a return pipe are connected between the evaporator shell and the condenser shell; the cooling circulation system comprises an electric heating wire and a condensation heat exchange tube, wherein the condensation heat exchange tube is arranged in the middle area of the condenser shell; the hot water circulation system comprises an evaporation heat exchange tube, and the evaporation heat exchange tube is arranged in the evaporator shell. Further, in the working medium circulation system, a plurality of temperature sensors are arranged on the upper surface and the lower surface of the evaporator shell, and a pressure sensor is arranged in the center of the upper surface and used for acquiring pressure data and temperature data of the evaporator shell in real time; the condenser shell upper surface is provided with a plurality of temperature sensors, and the center of the upper surface is provided with a pressure sensor for acquiring pressure data and temperature data of the condenser shell in real time. Further, in the working medium circulation system, an evaporation window is further arranged on the surface of the evaporator shell corresponding to the position of the evaporation heat exchange tube, and the evaporation window is used for observing the evaporation heat exchange tube inside the evaporator shell; The condenser shell surface corresponds the position of condensation heat exchange tube and installs the condensation window, the condensation window is used for observing the inside condensation heat