CN112985131B - Temperature descaling heat exchanger combination and ground source heat pump system thereof - Google Patents

Temperature descaling heat exchanger combination and ground source heat pump system thereof Download PDF

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Publication number
CN112985131B
CN112985131B CN202010279800.7A CN202010279800A CN112985131B CN 112985131 B CN112985131 B CN 112985131B CN 202010279800 A CN202010279800 A CN 202010279800A CN 112985131 B CN112985131 B CN 112985131B
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heat
pipe
heat exchanger
valve
heat pipe
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CN112985131A (en
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崔峥
刘昱
邵卫
邓高翔
郭春生
裴佃飞
朱幸福
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Shandong Institute Of Advanced Technology
Shandong University
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Shandong Institute Of Advanced Technology
Shandong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0266—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
    • F24T10/00—Geothermal collectors
    • F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
    • F24T10/13—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground using tube assemblies suitable for insertion into boreholes in the ground, e.g. geothermal probes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/0208—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes using moving tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
    • F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
    • F28D15/06—Control arrangements therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/082—Heat exchange elements made from metals or metal alloys from steel or ferrous alloys
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • F28F21/085—Heat exchange elements made from metals or metal alloys from copper or copper alloys
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/10—Geothermal energy

Abstract

The invention provides a temperature descaling heat exchanger combination and a ground source heat pump system thereof.A first valve and a third valve are opened, and a second valve and a fourth valve are closed, so that hot water enters a second heat exchanger for heat exchange and does not enter a first heat exchanger, and a tube bundle in a second heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling; the temperature that the temperature perception element in the second heat pipe detected is higher than certain numerical value, and the controller control second valve, fourth valve are opened this moment, and first valve, third valve are closed for hot water gets into first heat exchanger and carries out the heat transfer, does not get into in the second heat exchanger, makes the tube bank vibration in the first heat pipe, thereby reaches intensive heat transfer and scale removal purpose. According to the invention, the heat exchanger can continuously vibrate for descaling and heat exchange according to the temperature detected by the temperature sensing element.

Description

Temperature descaling heat exchanger combination and ground source heat pump system thereof
Technical Field
The invention belongs to the field of heat exchange, and particularly relates to a utilization system of a mine ground source heat pump.
Background
The gold industry develops rapidly, the demand of people for gold is continuously improved, the mining depth is continuously increased, and higher requirements are provided for the mining technology of gold mines. With the increase of mining depth of mines, ground pressure and rock temperature increase, the difficulty of conditions such as mine lifting drainage, support, ventilation and the like also increases, and the faced technical problem is increased continuously. In deep well mining, the most prominent problem is that the underground thermal environment is deteriorated, which not only restricts the safe production construction of mines, but also threatens the health of miners.
The traditional method for solving the problem of heat damage of the deep mine is mine circulating ventilation, but the method has a lot of problems. Firstly, as the depth of the mine increases, the defects of insufficient cooling capacity and ventilation limit become more and more prominent, so that the cooling effect is gradually reduced, and the actual requirement is difficult to meet. Secondly, the circular ventilation of the mine requires a large amount of electric energy to drive the mechanical equipment to generate forced convection air, and the operation of the mechanical equipment inevitably generates noise, which is uneconomical and affects the working conditions of underground workers.
The ground source heat pump uses ground source energy soil, underground water, surface water and low-temperature geothermal water as a low-temperature heat source for heating and supplying heat in winter of the heat pump air conditioning system, can replace the traditional boiler heating and supplying heat mode, and is an effective way for improving the urban atmospheric environment and saving energy. Ground source heat pumps generally consist of three parts: outdoor ground source heat pump system, heat pump set, indoor heating end device. The operation principle of the ground source heat pump is as follows: the terrestrial heat is absorbed by the outdoor ground source heat pump system and then transferred to the heat pump unit through the working medium, and the working medium of the heat pump unit absorbs the part of heat and then transfers the part of heat to the working medium (water) of the indoor terminal heating device.
The heat pipe is a high-efficiency heat exchange element, which transfers heat by means of repeated phase change (evaporation and condensation) of working liquid enclosed in the pipe, and can reach high heat flow density without external force. The heat pipe has the following advantages: efficient heat conductivity, excellent thermal responsiveness, good environmental adaptability and lower installation and running cost (small, simple structure, operation are stable, easy maintenance, long service life). The typical heat pipe is composed of a pipe shell, a liquid absorption core and an end cover, and then the pipe is pumped to negative pressure and then filled with a proper amount of working fluid to be sealed. The working liquid in the liquid absorption core of the evaporation section of the heat pipe absorbs heat and then is vaporized into steam, then the steam flows to the condensation section of the heat pipe under the action of pressure difference, exchanges heat with the outside and then is condensed into liquid, and then the liquid returns to the evaporation section, and is heated and vaporized again in the evaporation section. The above process is continuously circulated, and then heat continuously flows from the evaporation section to the condensation section.
The geothermal energy is the main source of the heat damage of the mine deep well, and the geothermal energy of the mine deep well can be fully utilized by adopting the heat pipe ground source heat pump technology. The invention takes away the heat of the mine deep well through the heat pipe ground source heat pump, thereby achieving the purpose of treating the heat damage of the mine deep well.
The basic idea of the invention is as follows: the heat pipe ground source heat pump is used for absorbing the terrestrial heat of the mine deep well, after heat is absorbed, the working fluid in the heat pipe is subjected to liquid-gas phase change, the steam after phase change exchanges heat with a pipeline through which chilled water flows, and the geothermal heat is taken away by the chilled water and returned to the ground for utilization. Based on the thought, the technology of the ground source heat pump for comprehensively treating the heat damage of the mine deep well is invented.
Disclosure of Invention
One of the main purposes of the invention is to provide a ground source heat pump system for treating the heat damage of the mine deep well, which is characterized in that the heat pipe ground source heat pump is arranged, so that the ground source heat pump is used for treating the heat damage of the mine deep well and simultaneously utilizing the geothermal energy of the deep well.
In order to achieve the purpose, the invention adopts the following technical scheme:
a temperature descaling heat exchanger combination comprises heat pipes, a first box body and a second box body, wherein the first box body is arranged in a pipeline of a ground water network system, the first box body is provided with an inlet and an outlet for water of the ground water network system to flow in and out, the second box body is arranged in a pipeline of a ground heat pump unit, the second box body is provided with an inlet and an outlet for refrigerant to flow in and out, the heat pipes comprise an evaporation section and a condensation section, the evaporation section is arranged in the first pipe box, the condensation section is arranged in the second pipe box, the system comprises two heat exchangers which are connected in series, the first heat exchanger and the second heat exchanger are respectively a first heat pipe and a second heat pipe, the pipeline of the ground water network system comprises two bypass pipelines, and the first bypass pipeline is connected with the ground water network system pipeline in parallel, a second bypass pipeline is connected in parallel with an underground water network system pipeline where the second heat exchanger is located, wherein the first bypass pipeline is provided with a first valve, the underground water network system pipeline connected in parallel with the first bypass pipeline is provided with a second valve, the second bypass pipeline is provided with a fourth valve, and the underground water network system pipeline connected in parallel with the second bypass pipeline is provided with a third valve; it is characterized in that the preparation method is characterized in that,
temperature sensing elements are arranged in the first heat pipe and the second heat pipe and used for detecting the temperature in the heat pipes, the temperature sensing elements are in data connection with a controller, and the controller controls whether hot water enters the first heat exchanger and the second heat exchanger for heat exchange according to the detected temperature;
the heat exchange steps of the first heat pipe and the second heat pipe are as follows:
1) the first valve and the third valve are opened, and the second valve and the fourth valve are closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and a tube bundle in the second heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the temperature detected by the temperature sensing element in the second heat pipe is higher than a certain value, at the moment, the controller controls the second valve and the fourth valve to be opened, and the first valve and the third valve are closed, so that hot water enters the first heat exchanger for heat exchange and does not enter the second heat exchanger, and the pipe bundle in the first heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the temperature detected by the temperature sensing element in the first heat pipe is higher than a certain value, the controller controls the first valve and the third valve to be opened, and the second valve and the fourth valve to be closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and the pipe bundle in the second heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
and then continuously repeating the steps 2) and 3) so as to realize the alternate heat exchange of the first heat pipe and the second heat pipe.
Preferably, the heat pipes comprise a lower pipe box, an upper pipe box and a condensation pipe group, the condensation pipe group comprises a left condensation pipe group and a right condensation pipe group, the left condensation pipe group is communicated with the upper pipe box and the lower pipe box, the right condensation pipe group is communicated with the upper pipe box and the lower pipe box, so that the lower pipe box, the upper pipe box and the condensation pipe group form a heating fluid closed cycle, the lower pipe box is filled with phase-change fluid, each condensation pipe group comprises a plurality of heat release pipes in a circular arc shape, the end parts of the adjacent heat release pipes are communicated, the plurality of heat release pipes form a serial structure, and the end parts of the heat release pipes form free ends of the heat release pipes; the lower tube box comprises a first tube opening and a second tube opening, the first tube opening is connected with an inlet of the left condensation tube group, the second tube opening is connected with an inlet of the right condensation tube group, an upper tube box is connected with an outlet of the left condensation tube group, and an upper tube box is connected with an outlet of the right condensation tube group.
A ground source heat pump system comprises a ground heat pump unit and an underground water network system, wherein the underground water network system comprises a heat pipe heat exchanger, a hot water dam, a heat exchanger, a turbine and a cold water dam which are sequentially connected through pipelines, water of the cold water dam enters the heat pipe heat exchanger, the heat pipe heat exchanger absorbs underground heat energy of a mine, then the water enters the hot water dam, then the water enters the heat exchanger of the ground heat pump unit from the hot water dam to release heat, and then the water enters the cold water dam through the turbine to finish a cycle; the ground heat pump unit comprises a circulation loop consisting of a heat exchanger, a compressor, a water-cooled condenser, a liquid storage device and a throttle valve which are sequentially connected through pipelines, a refrigerant absorbs heat in the heat exchanger, enters the compressor for compression and then enters the condenser for heat release, the refrigerant after heat release enters the liquid storage device and then enters the heat exchanger from the liquid storage device through the throttle valve to form circulation; the water-cooled condenser comprises a cold water inlet and a hot water outlet, and water enters the water-cooled condenser through the cold water inlet and then flows out through the hot water outlet after absorbing heat.
Preferably, a pump is arranged on a pipeline between the hot dam and the heat exchanger.
Preferably, the heat pipe heat exchanger comprises a heat pipe, the evaporation section of the heat pipe is installed in a soil hole, a gap between the inner wall of the soil hole and the outer wall of the heat pipe is filled with a heat conduction material, and a heat absorption pipe of the pipeline of the underground water network is arranged at the condensation section of the heat pipe.
Preferably, the evaporation section of the heat pipe is positioned at the lower end of the heat pipe and is placed in the soil, and the condensation section of the heat pipe is positioned above the soil.
Preferably, the material of the heat pipe is copper or steel.
Preferably, the refrigerant is a phase change material.
Preferably, the heat exchanger comprises a heat pipe, a first box and a second box, the first box is arranged in the underground water network system pipeline, the first box is provided with an inlet and an outlet for water of the underground water network system to flow in and out, the second box is arranged in the ground heat pump unit pipeline, the second box is provided with an inlet and an outlet for refrigerant to flow in and out, the heat pipe comprises an evaporation section and a condensation section, the evaporation section is arranged in the first pipe box, and the condensation section is arranged in the second pipe box.
Preferably, the heat exchanger is provided in plurality in series.
Compared with the prior art, the invention has the beneficial effects that:
1) the parameter difference or the accumulated parameter difference of the time periods before and after the detection of the parameter sensing element can judge that the evaporation of the internal fluid is basically saturated and the volume of the internal fluid is not changed greatly through the parameter difference. So that the fluid undergoes volume reduction to thereby realize vibration. When the pressure difference reduces to a certain degree, the internal fluid begins to enter a stable state again, and the fluid is required to be evaporated and expanded again through heat exchange, so that the heat exchange needs to be started.
2) The invention utilizes the ground source heat pump system to treat the heat damage of the mine deep well, the ground source heat pump system is arranged in the mine deep well to utilize the terrestrial heat of the deep well, and the part of the heat can be used for heating domestic water and can also be converted into energy in other forms (such as electric energy and the like). To a certain extent, the deeper the mine, the more severe the thermal hazard, i.e. the more energy available.
3) The invention adopts the heat pipe, the heat flow density is large, the heat transfer efficiency is high, and the energy conversion efficiency is higher; the heat pipe ground source heat pump is adopted, devices such as a motor fan and the like are not needed, the noise is low, and the working environment of a mine is improved; the invention adopts the heat pipe to absorb heat damage, and the filter screen is arranged in the pipeline, so that impurities in water can be filtered, the operation and maintenance are simple and convenient, and the cost is lower.
4) The invention can heat through the time variability, so that the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundles of the heat pipes 16 and 17, the vibration of the elastic tube bundles is continuously driven, and the heating efficiency and the descaling operation can be further realized. Internal fluid flow is avoided to create stability.
5) Compared with two upper pipe boxes designed in the prior art, the heat exchange device with the novel structure has the advantages that the pressure and the flow of the left and right pipe groups can be further balanced, and the uniform heat exchange is ensured. This application is to above-mentioned structure further improvement, reinforcing scale removal and heat transfer effect. The heat exchange effect can be improved, the heat release capacity of the heat exchange tube is improved, and the energy consumption is reduced.
6) The invention optimizes the optimal relation of the parameters of the heat exchange device through a large amount of experiments and numerical simulation, thereby realizing the optimal heating efficiency.
Description of the drawings:
fig. 1 is a schematic diagram of the overall structure of the system.
Fig. 2 is a schematic structural diagram of the underground heat pipe heat exchanger.
Fig. 3 is a schematic diagram of a heat exchanger structure.
Fig. 4 is a schematic cross-sectional view of a heat exchanger.
Fig. 5 is a schematic diagram of a heat exchanger control system.
Fig. 6 is a bottom view of the heat pipe of fig. 4.
Fig. 7 is a schematic view of a staggered arrangement of the condenser tube banks according to the present invention (upper tube boxes are not shown).
FIG. 8 is a schematic diagram of the end portion distribution of the evaporation section.
Fig. 9 is another schematic cross-sectional view of the heat exchanger.
The reference numbers are as follows:
1 ground heat pump unit 3 cold water inlet 4 hot water outlet 12 compressor 13 water-cooled condenser 14 reservoir 15 throttle valve
2 underground water network system 201 turbine 202 cold dam 203 valve 204 turbine 205 cold dam 206 hot dam 207 pump 208 valve 209 valve 210 pump 211 hot dam
5 the evaporation end of the heat exchange water pipe 52 of the underground heat pipe exchanger 51 and the working fluid 53
11 heat exchangers, 111 heat pipes, 112 a first box and 113 a second box.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings.
In this document, "/" denotes division and "×", "denotes multiplication, referring to formulas, if not specifically stated.
The system for utilizing the ground source heat pump in the mine as shown in fig. 1 to 9 comprises a ground heat pump unit 1 and a ground water network system 2, wherein the ground water network system 2 comprises an underground heat pipe heat exchanger 5, a hot water dam 211, a heat exchanger 11, a turbine 201 and a cold water dam 202 which are sequentially connected through a pipeline, water in the cold water dam 202 enters the underground heat pipe heat exchanger 5, the water absorbs underground heat energy of the mine in the underground heat pipe heat exchanger 5, then enters the hot water dam 211, then enters the heat exchanger 11 from the hot water dam 211 to release heat to a refrigerant of the ground heat pump unit 1, and then enters the cold water dam 202 through the turbine 201 to complete a cycle; the ground heat pump unit 1 comprises a circulation loop consisting of a heat exchanger 11, a compressor 12, a water-cooled condenser 13, a liquid storage device 14 and a throttle valve 15 which are sequentially connected through pipelines, wherein a refrigerant absorbs heat in the heat exchanger 11, enters the compressor 12 for compression, then enters the condenser 13 for heat release, enters the liquid storage device 14 after heat release, and then enters the heat exchanger 11 from the liquid storage device 14 through the throttle valve 15 to form circulation; the water-cooled condenser 13 comprises a cold water inlet 3 and a hot water outlet 4, water enters the water-cooled condenser 13 through the cold water inlet 3, and then flows out through the hot water outlet 4 after absorbing heat.
The invention utilizes the ground source heat pump system to treat the heat damage of the mine deep well, the ground source heat pump system is arranged in the mine deep well to utilize the terrestrial heat of the deep well, and the part of the heat can be used for heating domestic water and can also be converted into energy in other forms (such as electric energy and the like). To a certain extent, the deeper the mine, the more severe the thermal hazard, i.e. the more energy available.
The invention alleviates the problem of overlarge pressure of the water pipe caused by the deep well by arranging the dam and the turbine.
Preferably, a pump 210 is disposed on a pipeline between the hot dam 211 and the heat exchanger 5.
Preferably, a plurality of pipelines are arranged in parallel with the first pipeline on which the underground heat pipe heat exchanger 5 is arranged. And a valve 203, a turbine 204, a cold water dam 205, an underground heat pipe exchanger 5, a hot water dam 206, a pump 207 and a valve 208 are arranged on each parallel pipeline in sequence. The first pipeline is provided with a bypass pipeline which is connected with pipelines of the hot water dam 211 and the pump 210 in parallel, and the bypass pipeline is provided with a valve 209. The bypass valve has two main functions, namely, when equipment runs, the pressure of the main valve can be reduced by the valve on the bypass pipeline, so that the system can bear higher pressure and flow; and secondly, when the equipment is replaced and the main pipeline needs to be maintained and closed, the bypass pipeline is opened, and a bypass valve on the bypass pipeline can play a role in controlling fluid.
The pump and the valve are used for controlling and adjusting the flow of the underground water network to adapt to the situation of different heat loads of the underground heat pipe heat exchanger 5.
Turbines 201, 204 are a necessary design for underground water network systems of mines. The turbine has two functions, namely relieving the deep well pressure of the water pipe, and reducing the water pressure and converting the energy into electric energy to drive the water pump. Since the depth of the mine is typically above 4000m, the hydrostatic pressure of the water at such depths can typically reach 40 MPa. Such high pressures are detrimental to the operation of the plant, both with respect to the installation of the pipes, and therefore require the pressure of the water in the underground water network to be reduced before it is transported to the plant. The turbine is used for driving blades of the turbine when high-pressure water flows through the turbine, and the blades are connected with power generation equipment through a shaft. After the final water flows through the turbine, the water pressure is reduced and the energy stored in the water is converted into electric energy to drive the water pump.
By-passing valve 209 is a main valve 208 on the hot water circuit main. The function of bypass valve 209 and main valve 208 is to control whether hot water from hot dam 206 flows into hot dam 211, i.e. when bypass valve 209 is closed, hot water from hot dam 206 will be pumped directly into heat exchanger 11; when the bypass valve 209 is opened and the main valve 208 is closed, the hot water from the hot water dam 206 is pumped into the hot water dam 211 and then into the heat exchanger 11 through the water pump 210. Depending on the particular operating conditions, the power consumption of pumps 207 and 210 may be adjusted by adjusting the opening and closing of valves 208 and 209.
Preferably, as shown in fig. 1, the heat pipe heat exchanger includes a heat pipe, and a heat exchange water pipe 51 is disposed at a condensing section of the heat pipe to absorb heat energy underground. The heat pipe evaporation section is installed in the soil hole, and preferably, a gap between the inner wall of the soil hole and the outer wall of the heat pipe is filled with heat conduction materials such as sand and stones with uniform particles and fine grains, so that heat exchange between the heat pipe and surrounding soil is enhanced. Preferably, the soil hole is drilled by a drilling instrument.
Preferably, as shown in fig. 2 and 8, the evaporation section of the heat pipe includes a plurality of spaced downwardly extending end portions 53, each end portion 53 being individually disposed within a soil hole. The plurality of end parts 53 are arranged, so that the heat absorption area of the heat pipe is increased, and the heat transfer efficiency of the heat pipe is further improved.
Preferably, as shown in fig. 8, the evaporation section is of an annular structure, the ends 53 of the evaporation section are arranged in an annular shape, and in a horizontal projection, the ends 53 of multiple layers are arranged along a central point, and the axis of each layer of ends is at the same distance from the central point, so that an arc structure with the central point of the evaporation section as a center is formed.
The invention adopts the heat pipe, the heat flow density is large, the heat transfer efficiency is high, so the energy conversion efficiency is higher, the invention adopts the heat pipe ground source heat pump, does not need to adopt devices such as a motor fan and the like, has lower noise and is more beneficial to improving the working environment of a mine.
Preferably, the number of the end portions 53 of the evaporation section of the heat pipe is multiple, and the distribution density of the end portions 53 is increased along the radial direction from the center of the evaporation section to the outside. The more the end part is contacted with the soil, the larger the contact area of the end part with the soil is, and the smaller the number of the heat pipes absorbing heat per unit area is compared with the inner part, and the heat absorption effect is far better than that of the end part of the inner part. Inside more, because the quantity problem of adjacent heat pipe tip and soil for heat distribution is less, and like this, the evaporation end tip can both fully absorb heat in the different positions in soil, avoids some heat pipes overheated, and some tip endotherms are not enough, guarantees that the heat absorption of whole tip is even, avoids partial superheated steam to damage, causes the maintenance difficulty of product. Through the arrangement, the service life of the whole heat pipe can be the same. The arrangement is to ensure that the heat absorption area of the heat pipe is larger and larger along the radial direction from the center of the evaporation section to the outside.
Preferably, the distribution density of the end 53 of the evaporation section of the heat pipe increases gradually along the radial direction from the center of the evaporation section to the outside. Experiments and numerical simulation show that the arrangement can further improve the heat absorption uniformity of the end part of the heat pipe and better accord with the heat distribution rule.
Preferably, the end 53 of the heat pipe evaporation section is multiple, and the pipe diameter of the end 53 of the heat pipe evaporation section is gradually increased along the radial direction from the center of the evaporation section to the outside. The more the end part is contacted with the soil, the larger the contact area of the end part with the soil is, and the smaller the number of the heat pipes absorbing heat per unit area is compared with the inner part, and the heat absorption effect is far better than that of the end part of the inner part. Inside more, because the quantity problem of adjacent heat pipe tip and soil for heat distribution is less, and like this, the evaporation end tip can both fully absorb heat in the different positions in soil, avoids some heat pipes overheated, and some tip endotherms are not enough, guarantees that the heat absorption of whole tip is even, avoids partial superheated steam to damage, causes the maintenance difficulty of product. Through the arrangement, the service life of the whole heat pipe can be the same. The arrangement is to ensure that the heat absorption area of the heat pipe is larger and larger along the radial direction from the center of the evaporation section to the outside.
Preferably, the tube diameter of the end 53 of the evaporation section of the heat pipe gradually increases along the radial direction from the center of the evaporation section to the outside. Experiments and numerical simulation show that the arrangement can further improve the heat absorption uniformity of the end part of the heat pipe and better accord with the heat distribution rule.
Preferably, the evaporation section of the heat pipe is located at the lower end of the heat pipe and is placed in the soil, and the condensation section of the heat pipe is located above the soil and is connected with the heat exchange water pipe 51 of the underground water network.
Preferably, the material of the heat pipe is copper or steel.
Preferably, the refrigerant is a phase change material.
Preferably, as shown in fig. 3, the heat exchanger includes a heat pipe 111, a first tank 112, and a second tank 113, the first tank 112 being disposed in the underground water network system piping, the first tank 112 having an inlet and an outlet for inflow and outflow of water of the underground water network system, the second tank 113 being disposed in the ground heat pump system piping, the second tank 113 having an inlet and an outlet for inflow and outflow of refrigerant, the heat pipe 111 including an evaporation section disposed in the first tank 112 and a condensation section disposed in the second tank 113.
The heat exchanger 11 is provided with a heat absorption mode of the heat pipe, so that the heat utilization rate is further improved, the heat transfer efficiency is high, and the noise is low.
Preferably, the heat exchanger 11 is provided in plurality in series. Preferably, two are provided.
Fig. 5 discloses a schematic diagram of a heat exchanger control system. As shown in fig. 5, there are two heat exchangers 11, which are respectively a first heat exchanger 116 and a second heat exchanger 117, the underground water network system pipeline includes two bypass pipelines 114, 115, the first bypass pipeline 114 is connected in parallel with the underground water network system pipeline where the first heat exchanger 116 is located, the second bypass pipeline 115 is connected in parallel with the underground water network system pipeline where the second heat exchanger 117 is located, wherein the first bypass pipeline 114 is provided with a first valve 18, respectively, the underground water network system pipeline connected in parallel with the first bypass pipeline 114 is provided with a second valve 19, and by providing the first valve 18 and the second valve 19, it is possible to control whether water passes through the first heat exchanger 116 for heat exchange. The second bypass pipeline 115 is provided with a fourth valve 23, the ground water network system pipeline connected in parallel with the second bypass pipeline 115 is provided with a third valve 20, and the fourth valve 23 and the third valve 20 are arranged, so that whether water passes through the second heat exchanger 117 for heat exchange can be controlled.
The heat pipes 111 provided in the first heat exchanger 116 and the second heat exchanger 117 are the heat pipe 16 and the heat pipe 17, respectively.
Preferably, the heat pipes in the first heat exchanger 116 and the second heat exchanger 117 are elastic vibration tube bundle heat pipes, the structure is shown in fig. 4, the heat pipes include a lower pipe box 8, an upper pipe box 10 and condenser pipe groups 91 and 92, the condenser pipe groups include a left condenser pipe group 91 and a right condenser pipe group 92, the left condenser pipe group 91 is communicated with the upper pipe box 10 and the lower pipe box 8, the right condenser pipe group 92 is communicated with the upper pipe box 10 and the lower pipe box 8, so that the lower pipe box 8, the upper pipe box 10 and the condenser pipe groups form a heating fluid closed cycle, the lower pipe box 8 is filled with a phase change fluid, each condenser pipe group includes a plurality of heat release pipes 7 in an arc shape, the end portions of adjacent heat release pipes 7 are communicated, the plurality of heat release pipes 7 form a series structure, and the end portions of the heat release pipes 7 form heat release pipe free ends; the lower tube box comprises a first tube opening 81 and a second tube opening 82, the first tube opening 81 is connected with the inlet of the left condensation tube group 91, the second tube opening 82 is connected with the inlet of the right condensation tube group 92, the outlet of the left condensation tube group 91 is connected with the upper tube box 10, and the outlet of the right condensation tube group 92 is connected with the upper tube box 10; the first and second nozzles 81 and 82 are provided on the lower header 8 side, preferably on the upper side. Preferably, the upper header 10 is symmetrical along a middle position of the lower header.
Wherein the lower tube box 8 is an evaporation section of the heat pipe and the upper tube box is a condensation section of the heat pipe. At least one part or all of the upper pipe headers are arranged in a second pipe header 113 of a ground heat pump unit pipeline, and the lower pipe header 8 is arranged in a first pipe header 112 of a groundwater network system pipeline.
Preferably, the lower header 8 has a flat tube structure. The heat absorption area of the lower pipe box is expanded.
The lower channel box 8 is located below the upper channel box 10.
In the operation of the heat pipe, the heat is absorbed from hot water in an underground pipe network through the lower pipe box 8, then fluid in the lower pipe box 8 is evaporated and enters the upper pipe box through the first pipe opening 81 and the second pipe opening 82, then the heat is released to a refrigerant through the upper pipe box and the condensing pipe group, the fluid is condensed and enters the lower pipe box again under the action of gravity.
The structure of the upper tube box of the heat pipe is improved, so that the heat absorption area of the lower tube box of the heat pipe is increased under the condition of not changing the volume of the upper tube box of the heat pipe, and the heat release range of the heat pipe can be enlarged. Compared with the heat pipe lower tube box and the heat pipe upper tube box in the prior art, the heat exchange efficiency can be improved by more than 15%. Meanwhile, the volume and the floor area of the upper tube box are reduced, so that the structure is compact.
Compared with two upper pipe boxes designed in the prior art, the left and right pipe groups are connected with the same upper pipe box, so that the pressure and the flow of the left and right pipe groups can be further balanced, and the uniform heat exchange is ensured. This application is to above-mentioned structure further improvement, reinforcing scale removal and heat transfer effect.
Preferably, the upper header 10 and the lower header 8 extend in the horizontal direction.
Preferably, a plurality of condensation tube groups are provided along the horizontal direction of the upper tube box 10 and the lower tube box 8, and the condensation tube groups are arranged in parallel.
Preferably, a return pipe 83 is provided between the upper header 10 and the lower header 8, and the return pipe is preferably provided at both ends of the upper header 10 in the horizontal direction.
The lower header 8 is filled with a phase change fluid, preferably a vapor-liquid phase change fluid. The fluid is heated and evaporated in the lower tube box 8 and flows to the upper tube box 10 along the heat release tube bundle, the fluid is heated and then undergoes volume expansion, so that steam is formed, the volume of the steam is far larger than that of water, and therefore the formed steam can flow in the coil in a rapid impact manner. Because of volume expansion and steam flow, the free end of the heat-radiating pipe can be induced to vibrate, the vibration is transmitted to the surrounding heat-exchanging fluid by the free end of the heat-exchanging pipe in the vibrating process, and the fluid can also generate disturbance, so that the surrounding heat-exchanging fluid forms disturbance flow, a boundary layer is damaged, and the purpose of enhancing heat transfer is realized. The fluid is condensed and released heat in the left and right condensation pipes and then flows back to the lower pipe box through the return pipe.
According to the invention, the prior art is improved, and the condensation pipe groups are respectively arranged into two groups distributed on the left side and the right side, so that the condensation pipe groups distributed on the left side and the right side can perform vibration heat exchange descaling, the heat exchange vibration area is enlarged, the vibration is more uniform, the heat exchange effect is more uniform, the heat exchange area is increased, and the heat exchange and descaling effects are enhanced.
In practice, it has been found that continuous heating results in fluid stability of the internal heat pipe arrangement, i.e. the fluid no longer flows or flows less, or the flow is stable, resulting in a much reduced vibration performance of the coil, which affects the efficiency of the coil descaling and heating. The present invention therefore provides a further improvement to the system described above. The concrete improvement is as follows:
preferably, the heat pipes 16 and 17 are heated at intervals.
During one period of time T, the heat pipes 16 and 17 exchange heat as follows:
in a half period of 0-T/2, the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116 for heat exchange, and a tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
in a half period of T/2-T, the second valve 19 and the fourth valve 23 are opened, and the first valve 18 and the third valve 20 are closed, so that hot water enters the first heat exchanger 116 for heat exchange and does not enter the second heat exchanger 117, and a tube bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
By heating with the time variability, the fluid can be frequently evaporated, expanded and contracted in the elastic tube bundles of the heat pipes 16 and 17, so that the vibration of the elastic tube bundles is continuously driven, and the heating efficiency and the descaling operation can be further realized. Internal fluid flow is avoided to create stability.
T is 50 to 150 minutes.
The vibration of the coil pipe is continuously promoted in a periodic heating mode, so that the heating efficiency and the descaling effect are improved. However, adjusting the vibration of the tube bundle with a fixed periodic variation can lead to hysteresis and too long or too short a period. Therefore, the invention is further improved, and the vibration is intelligently controlled, so that the fluid in the fluid can realize frequent vibration, and good descaling and heating effects are realized. Aiming at the defects in the technology researched in the prior art, the invention provides a novel heat exchange mode for intelligently controlling vibration. Can improve the heating efficiency, thereby realizing good descaling and heat exchange effects.
Self-regulation vibration based on pressure
Preferably, a pressure sensing element is arranged inside the loop heat pipe 16, 17 for detecting the pressure inside the loop heat pipe, the pressure sensing element is in data connection with the controller, and the controller controls whether the hot water enters the first heat exchanger 116 and the second heat exchanger 117 for heat exchange according to the detected pressure.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) when the pressure detected by the pressure sensing element in the heat pipe 17 is higher than a certain value, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger 116 for heat exchange and does not enter the second heat exchanger 117, and the tube bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the pressure detected by the pressure sensing element in the heat pipe 16 is higher than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
Through the pressure that the pressure perception element detected, can satisfy under certain pressure condition, the evaporation of inside fluid has reached saturation basically, and the volume of inside fluid also basically changes little, and under this kind of condition, inside fluid is relatively stable, and the tube bank vibratility at this moment worsens, therefore needs to adjust, makes it vibrate to stop heating, thereby heats in switching to another heat pipe. So that the heat is continuously and alternately exchanged in the heat pipes 16 and 17 according to the pressure, and the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 are formed.
Preferably, the pressure sensing element is disposed in the left condensation tube group 91 and/or the right condensation tube group 92.
Preferably, the pressure sensing elements are provided in the left and right condensation tube groups 91 and 92. The average of the pressures of the two tube sets can then be selected as the regulating data.
Preferably, the pressure sensing element is disposed within the upper header.
Preferably, the pressure sensing element is arranged at the free end of the left condensation tube group and/or the right condensation tube group. Through setting up at the free end, can perceive the pressure variation of free end to realize better control and regulation. The average of the pressures of the two condenser tube banks can then be selected as the regulating data.
Independently adjusting vibration based on temperature
Preferably, temperature sensing elements are arranged inside the loop heat pipes 16 and 17 and used for detecting the temperature inside the heat pipes, the temperature sensing elements are in data connection with a controller, and the controller controls whether hot water enters the first heat exchanger 116 and the second heat exchanger 117 for heat exchange according to the detected temperature.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the temperature detected by the temperature sensing element in the heat pipe 17 is higher than a certain value, at this time, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger 116 for heat exchange and does not enter the second heat exchanger 117, and the tube bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the temperature detected by the temperature sensing element in the heat pipe 16 is higher than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
The temperature detected by the temperature sensing element can basically reach saturation when the temperature meets a certain temperature, and the volume of the internal fluid is not changed greatly basically. So that the heat pipes 16 and 17 are heated alternately according to the temperature, and the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 are realized.
Preferably, the temperature sensing element is disposed in the left condensation tube group 91 and/or the right condensation tube group 92.
Preferably, the temperature sensing elements are disposed in the left and right condensation tube groups 91 and 92. The average of the temperatures of the two headers can be selected as the regulating data.
Preferably, the temperature sensing element is disposed in the upper header.
Preferably, the temperature sensing element is arranged at the free end of the left condensation tube group and/or the right condensation tube group. Through setting up at the free end, can perceive the temperature variation of free end to realize better control and regulation. The average of the temperatures of the two condenser tube banks can then be selected as the regulating data.
Thirdly, automatically adjusting vibration based on liquid level
Preferably, liquid level sensing elements are respectively arranged inside the lower pipe boxes of the heat pipes 16 and 17 and used for detecting the liquid levels of the fluids in the lower pipe boxes of the heat pipes 16 and 17, the liquid level sensing elements are in data connection with a controller, and the controller controls whether the hot water heats the heat pipes 16 and 17 or not according to the detected liquid levels of the fluids.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) when the liquid level detected by the liquid level sensing element in the heat pipe 17 is lower than a certain value, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger 116 for heat exchange and does not enter the second heat exchanger 117, and the tube bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the liquid level detected by the liquid level sensing element in the heat pipe 16 is lower than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
The liquid level detected by the liquid level sensing element can basically reach saturation of evaporation of the internal fluid and basically does not change much in volume of the internal fluid under the condition of meeting a certain liquid level (such as the lowest limit). So that the heat pipes 16 and 17 are heated alternately according to the liquid level, and the heat pipes 16 and 17 are vibration descaled and heat exchanged continuously.
Fourthly, automatically adjusting vibration based on speed
Preferably, a speed sensing element is arranged inside the free end of the tube bundle of the heat pipes 16 and 17 and used for detecting the flow speed of the fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, and the controller controls whether the hot water heats the heat pipes 16 and 17 or not according to the detected speed of the fluid.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) when the flow rate detected by the speed sensing element in the heat pipe 17 is higher than a certain value, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger 116 for heat exchange and does not enter the second heat exchanger 117, and the tube bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the flow rate detected by the speed sensing element in the heat pipe 16 is higher than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of enhancing heat transfer and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
The flow rate detected by the speed sensing element can substantially saturate the evaporation of the internal fluid and substantially reduce the volume of the internal fluid when a certain speed (e.g., the maximum upper limit) is satisfied. So that the heat pipes 16 and 17 are heated alternately according to the speed, thereby forming continuous vibration descaling and heat exchange of the heat pipes 16 and 17.
Preferably, the present invention provides a novel system for intelligently controlling vibrations. Can improve the heating efficiency, thereby realizing good descaling and heating effects.
Automatically adjusting vibration based on pressure difference
Preferably, pressure sensing elements are arranged inside the loop heat pipes 16 and 17 and used for detecting the pressure inside the electric heating device, the pressure sensing elements are in data connection with the controller, the controller extracts pressure data according to a time sequence, pressure difference or accumulation of pressure difference changes of the pressure sensing elements is obtained through comparison of the pressure data of adjacent time periods, and the controller controls whether water enters the first heat exchanger and the second heat exchanger for heat exchange according to the detected pressure difference or accumulation of the pressure difference changes.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the pressure difference or the accumulation of the pressure difference change detected by the pressure sensing element in the heat pipe 17 is lower than a certain value, at this time, the controller controls the second valve 19 and the fourth valve 23 to be opened, the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger 116 for heat exchange, and does not enter the second heat exchanger 117, so that the tube bundle in the heat pipe 16 vibrates, and the purposes of heat transfer enhancement and descaling are achieved;
3) when the pressure difference or the accumulation of the pressure difference change detected by the pressure sensing element in the heat pipe 16 is lower than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of enhancing heat transfer and descaling.
And then continuously repeating the steps 2) and 3) so as to realize the alternate heat exchange of the first heat exchanger and the second heat exchanger.
Through the fore-and-aft time quantum pressure differential or the accumulative pressure differential that pressure sensing element detected, can judge through the pressure differential that the evaporation of inside fluid has basically reached the saturation, the volume of inside fluid also basically changes little, and inside fluid is relatively stable under this kind of circumstances, and the tube bank vibratility variation this moment, consequently need adjust, makes it vibrate to stop heating, thereby switches to and carries out the heat transfer in another heat exchanger. So that the heat is continuously and alternately exchanged in the heat pipes 16 and 17 according to the pressure, and the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 are formed.
The stable state of the fluid is judged according to the pressure difference or the accumulation of the pressure difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
Preferably, in the heat exchange process of the heat pipe 16 or the heat pipe 17, if the pressure in the previous time period is P1, and the pressure in the adjacent subsequent time period is P2, if P1< P2, the pressure difference between P2 and P1 is lower than the threshold value, the controller switches to the other heat pipe 17 or 16 for heating through controlling the valve.
The current heat pipe is determined to be in a heating state through sequential pressure judgment, so that the running state of a heat source is determined according to different conditions.
Preferably, in the heat exchange process of the heat pipe 16 or the heat pipe 17, if the pressure of the preceding period is P1 and the pressure of the adjacent following period is P2, if P1= P2, the heating is judged according to the following conditions:
if the P1 is larger than the pressure of the first data, the controller controls the valve to switch another heat exchanger for heat exchange; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the first data is a pressure at which the phase change fluid is substantially phase-changed;
if the pressure P1 is less than or equal to the pressure of the second data, the controller controls the heat exchanger to continue heat exchange, wherein the pressure of the second data is less than or equal to the pressure at which the phase-change fluid does not change phase.
The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. Through the judgment of the pressure, whether the current heat exchanger is in a heat exchange state or a non-heat exchange state is also determined, so that the operation state of the heat exchanger is determined according to different conditions.
Preferably, the number of the pressure sensing elements is n, and the pressure P in the current time period is calculated in sequenceiPressure Q of the preceding periodi-1Difference D ofi=Pi-Qi-1And for n pressure differences DiPerforming arithmetic cumulative summation
Figure DEST_PATH_IMAGE001
And when the value of Y is lower than a set threshold value, the controller controls the valve to switch the heating heat pipe or not.
Preferably, when Y is greater than 0, the controller controls the valve to switch the heat exchanger to exchange heat when Y is lower than the threshold value; if Y <0, then below the threshold, the heat exchanger is not switched.
The heating state of the current heat pipe is determined by sequential pressure judgment, so that the running state of a heat source is determined according to different conditions.
Preferably, if Y =0, the heating is judged according to the following:
if P isiThe arithmetic mean of the first data is larger than the pressure of the first data, and the controller switches the other heat exchanger for heat exchange; wherein the first data is greater than the pressure of the phase change fluid after the phase change; preferably the pressure at which the phase change fluid substantially changes phase;
if P isiIs less than the pressure of the second data, the controller controls the present heat exchanger to only exchange heat, wherein the second data is less than or equal to the pressure at which the phase change fluid does not undergo a phase change.
The first data is pressure data in a fully heated state, and the second data is pressure data in the absence of heating or in the beginning of heating. Through the judgment of the pressure, whether the current heat exchanger is in a heating state or a non-heating state is also determined, so that the operation state of the heat exchanger is determined according to different conditions.
Preferably, the period of time for measuring the pressure is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 100-1000 pa, preferably 500 pa.
Preferably, the pressure value may be an average pressure value over a period of the time period. Or may be a pressure at a certain time within a time period. For example, preferably both are pressures at the end of the time period.
Preferably, the pressure sensing element is arranged in the left condensation tube group and/or the right condensation tube group.
Preferably, the pressure sensing elements are arranged in the left and right condenser tube groups. The average of the pressures of the two tube sets can then be selected as the regulating data.
Preferably, the pressure sensing element is arranged at the free end of the left condensation tube group and/or the right condensation tube group. Through setting up at the free end, can perceive the pressure variation of free end to realize better control and regulation. The average of the pressures of the two condenser tube banks can then be selected as the regulating data.
Second, automatically adjusting vibration based on temperature difference
Preferably, temperature sensing elements are arranged inside the loop heat pipes 16 and 17 and used for detecting the temperature inside the electric heating device, the temperature sensing elements are in data connection with the controller, the controller extracts temperature data according to a time sequence, the temperature difference or the accumulation of the temperature difference change is obtained through comparison of the temperature data of adjacent time periods, and the controller controls whether hot water exchanges heat with the first heat exchanger and the second heat exchanger according to the detected temperature difference or the accumulation of the temperature difference change.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the temperature difference or the accumulated value of the temperature difference change detected by the temperature sensing element in the heat pipe 17 is lower than a certain value, at the moment, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger for heat exchange and does not enter the second heat exchanger, and a pipe bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the temperature difference or the accumulated change of the temperature difference detected by the temperature sensing element in the heat pipe 16 is lower than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
Through the temperature difference or the accumulation of the temperature difference change detected by the temperature sensing element, the evaporation of the internal fluid is basically saturated and the volume of the internal fluid is basically not changed greatly under the condition of meeting a certain temperature, in this case, the internal fluid is relatively stable, the vibration of the tube bundle is reduced, and therefore adjustment is needed to be carried out, so that the tube bundle is vibrated, the heating is stopped, and the tube bundle is switched to another heat exchanger for heating. So that the heat is continuously and alternately exchanged in the heat pipes 16 and 17 according to the temperature, and the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 are formed.
The stable state of the fluid is judged according to the temperature difference or the accumulation of the temperature difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
Preferably, if the temperature of the previous time period is T1, the temperature of the adjacent subsequent time period is T2, and if T1< T2, the controller controls the valve to switch another heat exchanger for heat exchange when T2-T1 is lower than a threshold value.
The current heat source is determined to be in a heating state through sequential temperature judgment, so that whether the heat pipe is switched or not is determined according to different conditions.
Preferably, if the temperature of the preceding period is T1, the temperature of the adjacent succeeding period is T2, and if T1= T2, the heating is judged according to the following cases:
if the T1 is greater than the temperature of the first data, the controller controls the valve to switch another heat exchanger for heat exchange; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the first data is a temperature at which the phase change fluid substantially changes phase;
if T1 is less than or equal to the temperature of the second data, the controller controls the heat pipe to continue heating without switching another heat exchanger for heat exchange, wherein the second data is less than or equal to the temperature at which the phase change fluid does not change phase.
The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. The judgment of the temperature also determines whether the current heat exchanger is in a heating state or a non-heating state, so that the operation state of the heat source is determined according to different conditions.
Preferably, the number of the temperature sensing elements is n,sequentially calculating the temperature T of the current time periodiTemperature Q of the preceding time periodi-1Difference D ofi=Ti-Qi-1And for n temperature differences DiPerforming arithmetic cumulative summation
Figure 747764DEST_PATH_IMAGE001
And when the value of Y is lower than a set threshold value, the controller controls the valve to switch another heat exchanger for heat exchange.
Preferably, when Y is greater than 0, the controller controls the valve to switch another heat exchanger for heat exchange when Y is lower than the threshold value; if Y is less than 0, the heat exchanger is controlled by the controller to continuously exchange heat when Y is lower than the threshold value, and the heat exchanger is not switched.
The heating state of the current heat exchanger is determined by sequential temperature judgment, so that the running state of the heat pipe is determined according to different conditions.
Preferably, if Y =0, the heating is judged according to the following:
if T isiThe arithmetic mean of the first data is larger than the temperature of the first data, and the controller controls the valve to switch another heat exchanger for heat exchange; wherein the first data is greater than the temperature of the phase change fluid after the phase change; preferably the temperature at which the phase change fluid substantially changes phase;
if T isiIs less than the temperature of the second data, the controller controls not to switch the other heat exchanger for heat exchange, wherein the second data is less than or equal to the temperature at which the phase change fluid does not change phase.
The first data is temperature data of a sufficiently heated state, and the second data is temperature data of no heating or temperature data of the beginning of heating. Through the judgment of the temperature, whether the current heat exchanger is in a heating state or a non-heating state is also determined, so that the operation state of the heat exchanger is determined according to different conditions.
Preferably, the period of time for measuring the temperature is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-10 deg.C, preferably 4 deg.C.
Preferably, the temperature value may be an average temperature value over a period of the time period. Or may be the temperature at a certain point in time. For example, preferably both are temperatures at the end of the time period.
Preferably, the temperature sensing element is arranged in the left condensation pipe group and/or the condensation pipe group.
Preferably, the temperature sensing elements are arranged in the left and right condenser tube groups. The average of the temperatures of the two headers can be selected as the regulating data.
Preferably, the temperature sensing element is arranged at the free end of the left condensation tube group and/or the right condensation tube group. Through setting up at the free end, can perceive the temperature variation of free end to realize better control and regulation. The average of the temperatures of the two condenser tube banks can then be selected as the regulating data.
Third, automatically adjusting vibration based on liquid level difference
Preferably, liquid level sensing elements are respectively arranged in the lower pipe boxes of the heat pipes 16 and 17 and used for detecting liquid levels of fluids in the lower pipe boxes of the heat pipes 16 and 17, the liquid level sensing elements are in data connection with a controller, the controller extracts liquid level data according to a time sequence, and obtains the liquid level difference or the accumulation of the liquid level difference change through comparison of liquid level data of adjacent time periods, and the controller controls whether hot water conducts heat exchange on the first heat exchanger and the second heat exchanger according to the detected liquid level difference or the accumulation of the liquid level difference change of the fluids.
The heat exchange steps of the heat pipe 16 and the heat pipe 17 are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger 117 for heat exchange and does not enter the first heat exchanger 116, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the accumulated liquid level difference or liquid level difference change detected by a liquid level sensing element in the heat pipe 17 is lower than a certain value, at the moment, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger for heat exchange and does not enter the second heat exchanger, and a pipe bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the liquid level difference or the accumulation of the liquid level difference change detected by the liquid level sensing element in the heat pipe 16 is lower than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
Through the accumulation of the liquid level difference or the change of the liquid level difference detected by the liquid level sensing element, the evaporation of the internal fluid is basically saturated and the volume of the internal fluid is basically not changed greatly under the condition of meeting a certain liquid level (such as the lowest limit). Therefore, heat exchange is continuously and alternately carried out in the heat pipes 16 and 17 according to the liquid level height, and continuous vibration descaling and heat exchange of the heat pipes 16 and 17 are formed.
The stable state of the fluid is judged according to the liquid level difference or the accumulation of the change of the liquid level difference, so that the result is more accurate, and the problem of error increase caused by aging due to the problem of operation time is solved.
Preferably, if the liquid level in the previous time period is L1, the liquid level in the adjacent subsequent time period is L2, and if L1> L2, the controller controls to switch to another heat exchanger for heat exchange when L2-L1 is lower than a threshold value.
The current heating state of the heat pipe is determined by sequential liquid level judgment, so that the running state of the heat exchanger is determined according to different conditions.
Preferably, if the liquid level of the preceding period is L1, the liquid level of the adjacent succeeding period is L2, and if L1= L2, heating is judged according to the following cases:
if the L1 is less than the liquid level of the first data or the L1 is 0, the controller controls to switch to another heat exchanger for heat exchange; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably the first data is a level at which the phase change fluid is substantially phase changed;
and if the L1 is greater than or equal to the liquid level of the second data, the controller controls not to switch to another heat exchanger for heat exchange and continues heating, wherein the second data is less than or equal to the liquid level at which the phase change fluid does not have the phase change.
The first data is liquid level data of a fully heated state, including liquid level of dry-out, and the second data is liquid level data of no heating or heating beginning. Through the judgment of the liquid level, whether the current heat source is in a heating state or a non-heating state is also determined, so that the operation state of the heat source is determined according to different conditions.
Preferably, the number of the liquid level sensing elements is n, and the liquid level L in the current time period is calculated in sequenceiAnd the liquid level Q of the previous time periodi-1Difference D ofi=Li-Qi-1And for n liquid level differences DiPerforming arithmetic cumulative summation
Figure 895849DEST_PATH_IMAGE001
And when the value of Y is lower than a set threshold value, the controller controls whether to switch to another heat exchanger for heat exchange.
Preferably, when Y >0 is lower than the threshold, the controller controls the heat pipes 16 and 17 to be switched.
The current state of the heat exchanger is determined by sequential liquid level judgment, so that the running state of the heat exchanger is determined according to different conditions.
Preferably, if Y =0, the heating is judged according to the following:
if L isiIs less than the liquid level of the first data or is 0, the controller controls the heat exchangers 116, 117 to switch; wherein the first data is greater than the liquid level of the phase-change fluid after the phase change; preferably a level at which the phase change fluid is substantially phase-changed;
if L isiIs greater than the level of the second data,the controller controls the heat exchangers 116, 117 not to switch, wherein the second data is less than or equal to a level at which no phase change of the phase change fluid occurs.
The first data is liquid level data of a fully heated state, including liquid level of dry-out, and the second data is liquid level data of no heating or heating beginning. Through the judgment of the liquid level, whether the current heat exchanger is in a heating state or a non-heating state is also determined, so that the operation state of the heat exchanger is determined according to different conditions.
Preferably, the period of time for measuring the liquid level is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-10 mm, preferably 4 mm.
Preferably, the water level value may be an average water level value over a period of the time period. Or the water position at a certain moment in time. Such as preferably both water levels at the end of the time period.
Fourthly, automatically adjusting vibration based on speed difference
Preferably, a speed sensing element is arranged inside the free end of the tube bundle of the heat pipes 16 and 17 and used for detecting the flow speed of the fluid in the free end of the tube bundle, the speed sensing element is in data connection with a controller, the controller extracts speed data according to a time sequence, the speed difference or the accumulation of the speed difference change is obtained through comparison of the speed data of adjacent time periods, and the controller controls whether the hot water heats the first heat exchanger and the second heat exchanger according to the detected speed difference or the accumulation of the speed difference change of the fluid.
The heat exchange steps of the first heat exchanger and the second heat exchanger are as follows:
1) the first valve 18 and the third valve 20 are opened, and the second valve 19 and the fourth valve 23 are closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and a tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the speed difference or the accumulation of the speed difference change detected by the speed sensing element in the heat pipe 17 is lower than a certain value, at the moment, the controller controls the second valve 19 and the fourth valve 23 to be opened, and the first valve 18 and the third valve 20 to be closed, so that hot water enters the first heat exchanger for heat exchange and does not enter the second heat exchanger, and a pipe bundle in the heat pipe 16 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the speed difference or the accumulated change of the speed difference detected by the speed sensing element in the heat pipe 16 is lower than a certain value, the controller controls the first valve 18 and the third valve 20 to be opened, and the second valve 19 and the fourth valve 23 to be closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and the tube bundle in the heat pipe 17 vibrates, thereby achieving the purposes of heat transfer enhancement and descaling.
And then repeating the steps 2) and 3) continuously, thereby realizing the alternate heat exchange of the heat pipes 16 and 17.
The flow rate detected by the speed sensing element can basically reach saturation of the evaporation of the internal fluid and not change the volume of the internal fluid basically under the condition of meeting a certain speed (such as the highest upper limit). So that the heat is exchanged alternately in the heat pipes 16 and 17 according to the speed, and the continuous vibration descaling and heat exchange of the heat pipes 16 and 17 are formed.
The stable state of the fluid is judged according to the speed difference or the accumulation of the speed difference change, so that the result is more accurate, and the problem of error increase caused by aging due to the running time problem is solved.
Preferably, if the speed of the preceding time period is V1 and the speed of the adjacent following time period is V2, the controller controls the heat exchangers 116, 117 to switch heating when V1 < V2, which is lower than the threshold value.
The current heat exchange state is determined by the sequential speed judgment, so that the running state of the heat pipe is determined according to different conditions.
Preferably, if the speed of the preceding time period is V1 and the speed of the adjacent succeeding time period is V2, if V1 = V2, the heating is judged according to the following cases:
if V1 is larger than the speed of the first data, the controller controls the heat exchangers 116 and 117 to switch heat exchange; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the first data is the speed at which the phase change fluid is substantially phase changed;
if V1 is less than or equal to the rate of the second data, which is less than or equal to the rate at which the phase change fluid does not undergo a phase change, the controller controls the heat exchangers 116, 117 not to switch heat exchange.
The first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started. The judgment of the speed also determines whether the current heat exchanger is in a heating state or a non-heating state, so that the operation state of the heat source is determined according to different conditions.
Preferably, the number of the speed sensing elements is n, and the speed V of the current time period is calculated in sequenceiAnd the previous time speed Qi-1Difference D ofi=Vi-Qi-1And for n speed differences DiPerforming arithmetic cumulative summation
Figure 841808DEST_PATH_IMAGE001
When the value of Y is lower than the set threshold, the controller controls whether the heat exchangers 116, 117 switch heat exchange.
Preferably, when Y >0 is lower than the threshold value, the controller controls the heat exchangers 116 and 117 to switch heat exchange.
The current heating state of the heat pipe is determined by the sequential speed judgment, so that the running state of the heat exchanger is determined according to different conditions.
Preferably, if Y =0, the heating is judged according to the following:
if ViIs greater than the speed of the first data, the controller controls the heat exchangers 116, 117 to switch heat exchange; wherein the first data is greater than the speed of the phase change fluid after the phase change; preferably the rate at which the phase change fluid changes phase substantially;
if ViIs less than the rate of the second data, which is less than or equal to the rate at which no phase change of the phase change fluid occurs, the controller controls the heat exchangers 116, 117 not to switch heat exchange.
The first data is speed data of a sufficiently heated state, and the second data is speed data of no heating or heating just started. Through the judgment of the speed, whether the current heat exchanger is in a heating state or a non-heating state is also determined, so that the operation state of the heat exchanger is determined according to different conditions.
Preferably, the period of time for measuring the speed is 1 to 10 minutes, preferably 3 to 6 minutes, and further preferably 4 minutes.
Preferably, the threshold is 1-3 m/s, preferably 2 m/s.
Preferably, the speed value may be an average pressure value over a period of the time period. Or may be a speed at a certain time within the time period. For example, preferably both are speeds at the end of the time period.
Preferably, the above-mentioned alternating operation, the operation according to the parameter or the operation according to the parameter difference may be the operation in the descaling phase of the heat exchangers 116, 117, or may be the normal operation phase.
Preferably, the first valve 18 and the third valve 20 are closed and the second valve 19 and the fourth valve 23 are opened in normal operation, so that the fluid enters the first heat exchanger and the second heat exchanger for heat exchange.
Preferably, the condensation pipes of the left condensation pipe group are distributed in the center of a circle, and the condensation pipes of the right condensation pipe group are distributed in the center of a circle. The left and right condenser pipes are arranged as circle centers, so that the distribution of the condenser pipes can be better ensured, and the vibration and the heating are uniform.
Preferably, the number of the left condensation tube group and the number of the right condensation tube group are both plural.
Preferably, the left condensation tube group and the right condensation tube group are mirror images along a plane on which a vertical direction axis of the condensation part is located. Through such setting, can make the heat release pipe distribution of heat transfer more reasonable even, improve the heat transfer effect.
Preferably, as shown in fig. 7, the left condensation tube group 91 and the right condensation tube group 92 are arranged in a staggered manner in the horizontal extending direction. Through the staggered distribution, can make to vibrate on different length and release heat and scale removal for the vibration is more even, strengthens heat transfer and scale removal effect.
Preferably, as shown in fig. 9, the first nozzle 81 and the second nozzle 82 may be provided in plural, for example, two nozzles are provided in fig. 2, and by providing plural nozzles, the speed of the steam entering the condensing section in the evaporation section can be increased, and the heat utilization can be accelerated.
In tests it was found that the volume, the distance of the upper channel and the volume of the lower channel can have an influence on the heat exchange efficiency and the homogeneity. If the volume undersize of lower tube case, lead to the steam overheated, the heat can't in time be transmitted to heat release pipe and left condenser pipe group right side condenser pipe group, the volume is too big, lead to the steam condensation too fast, also can't transmit, the volume of putting the heat pipe with the principle must be suitable for with the long-pending collocation of heat transfer water tank, otherwise can lead to the steam condensation too fast or too slow, all can lead to the heat transfer condition to worsen, the distance also can lead to heat exchange efficiency too poor between the heat release pipe, the distance is too little, then heat release pipe distributes too closely, also can influence heat exchange efficiency, the distance also need be suitable for with the distance collocation between the lower tube case between the heat release pipe, otherwise the distance between them can influence the volume of the liquid or the steam that hold, then can exert an influence to the vibration of free end, thereby influence the heat transfer. Therefore, the volume and distance of the heat release pipe and the volume of the lower tube box have a certain relationship.
The invention provides an optimal size relation summarized by numerical simulation and test data of a plurality of heat pipes with different sizes. Starting from the maximum heat exchange amount in the heat exchange effect, nearly 200 forms are calculated. The dimensional relationship is as follows:
the volume of the upper tube box is V1, the volume of the lower tube box is V3, the included angle formed between the middle point of the bottom of the lower tube box and the circle centers of the left condensation tube group and the right condensation tube group is A, and the following requirements are met:
V1/V3=a-b*sin(A/2)2-c sin (a/2); where a, b, c are parameters, sin is a trigonometric sine function,
0.8490< a <0.8492, 0.1302< b <0.1304, 0.0020< c < 0.0022; preferably, a is 0.8491, b is 0.1303, and c is 0.0021.
Preferably, the included angle A formed between the middle point of the bottom of the lower tube box and the circle center of the heat-radiating tube is 40-120 degrees (angle), and preferably 80-100 degrees (angle).
Preferably, 0.72< V1/V3<0.85;
preferably, the number of the heat-releasing tubes of the condensation tube group is 3 to 5, preferably 3 or 4.
Preferably, the radius of the heat-radiating pipe is preferably 10-40 mm; preferably 15 to 35mm, more preferably 20 to 30 mm.
In the prior application, the volume and the distance of an upper pipe and the volume of a lower pipe box are related through an optimized relational expression for the first time to obtain the optimal dimensional relation, wherein the distance between the center of a left condensation pipe group and the center of a right condensation pipe group is M, the pipe diameter of the left condensation pipe group and the radius of the right condensation pipe group are the same, B is B, the radius of the axis of the innermost heat release pipe in the heat release pipes is N1, and the radius of the axis of the outermost heat release pipe is W2. The above relation formula of the present application is a further improvement of the relation formula of the previous application, and belongs to the original invention point of the present invention through the relation formula of the volume and the included angle.
Preferably, the tube bundle of the condensing tube bank is an elastic tube bundle. The tube bundle of the condensing tube group is provided with the elastic tube bundle, so that the heat exchange coefficient can be further improved.
The number of the condensing tube groups is multiple, and the plurality of condensing tube groups are of parallel structures.
The mine deep well heat hazard treatment system of the heat pipe ground source heat pump comprises a ground heat pump unit, an underground water network system and an underground heat pipe heat exchanger, wherein the ground heat pump unit is provided with a mine hot water inlet, a chilled water outlet, a cold water inlet and a hot water outlet, and the mine hot water inlet, the chilled water outlet, the cold water inlet and the hot water outlet are respectively positioned at the right lower part, the left lower part, the right upper part and the left upper part of the heat pump unit. And the cold water inlet and the hot water outlet are connected with a heating device at the tail end of the user room. The mine hot water inlet and the chilled water outlet are communicated with an underground water network system, the underground water network system is communicated with an underground heat pipe heat exchanger, the heat exchanger is located between the cold water loop and the hot water loop, and the heat exchanger is communicated with the chilled water outlet. The chilled water sequentially passes through the chilled water outlet, the underground water network system and the underground heat pipe heat exchanger to enter the ground heat pump unit, and when the chilled water flows through the underground heat pipe heat exchanger, the heat generated by the phase change of the working liquid of the heat pipe is absorbed through the circulating flow of the chilled water, so that the heat damage of the mine deep well is treated and utilized.
Further, the ground heat pump unit comprises a heat exchanger, a compressor, a water-cooled condenser, a liquid storage device and a throttle valve, wherein the refrigerant in the heat exchanger absorbs heat of hot water from a mine and changes into gas through phase change.
Further, the gas is compressed in the compressor and then enters a water-cooled condenser to release heat. The condensed refrigerant liquid flows through the liquid storage device, is reduced in pressure by the throttle valve and then flows back to the heat exchanger to absorb heat and be gasified.
Furthermore, the ground heat pump unit is connected with a ground water network system through a network formed by water pipes, and filter screens are arranged in the water pipes so as to be convenient for regular cleaning and maintenance.
Further, the underground water network system consists of water pipes, dams, turbines, pumps and valves, and the dams and the turbines are used for relieving the problem of overlarge pressure of the water pipes caused by deep wells.
The pump and the valve are used for controlling and adjusting the flow of the underground water network so as to adapt to the situation of different heat loads of the underground heat pipe heat exchanger.
Furthermore, the underground heat pipe heat exchanger device comprises a group of heat pipes and working liquid in the heat pipes, wherein the lower ports of the heat pipes are closed and are vertically placed in the soil holes. The soil hole is drilled by a drilling instrument, and a gap between the inner wall of the soil hole and the outer wall of the heat pipe is filled with a material with better heat conductivity, such as sand and stone with uniform and fine particles, so that the heat exchange between the heat pipe and the surrounding soil is enhanced.
Furthermore, the evaporation section of the group of heat pipes is positioned at the lower end of the heat pipe and is placed in the soil, and the heat insulation section of the group of heat pipes is positioned above the soil and is connected with the underground water network.
Further, the working fluid is a phase-change material, such as R134a, freon, and the like.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (2)

1. A heat exchanger combination for temperature descaling comprises a heat pipe, a first box body and a second box body, wherein the first box body is arranged in a pipeline of a ground water network system, the first box body is provided with an inlet and an outlet for water of the ground water network system to flow in and out, the second box body is arranged in a pipeline of a ground heat pump unit, the second box body is provided with an inlet and an outlet for refrigerant to flow in and out, the heat pipe comprises an evaporation section and a condensation section, the evaporation section is arranged in the first box body, the condensation section is arranged in the second box body, the heat pipe comprises a lower box body, an upper box body and a condensation pipe group, the condensation pipe group comprises a left condensation pipe group and a right condensation pipe group, the left condensation pipe group is communicated with the upper box body and the lower box body, the right condensation pipe group is communicated with the upper box body and the lower box body, so that the lower box body, the upper box body and the condensation pipe group form a closed circulation of heating fluid, phase-change fluid is filled in the lower tube box, each condensation tube group comprises a plurality of arc-shaped heat release tubes, the end parts of the adjacent heat release tubes are communicated, the heat release tubes form a serial structure, and the end parts of the heat release tubes form free ends of the heat release tubes; the lower tube box comprises a first tube opening and a second tube opening, the first tube opening is connected with the inlet of the left condensation tube group, the second tube opening is connected with the inlet of the right condensation tube group, the outlet of the left condensation tube group is connected with the upper tube box, and the outlet of the right condensation tube group is connected with the upper tube box; the system comprises two heat exchangers which are connected in series, namely a first heat exchanger and a second heat exchanger, wherein the heat pipes arranged in the first heat exchanger and the second heat exchanger are respectively a first heat pipe and a second heat pipe; it is characterized in that the preparation method is characterized in that,
temperature sensing elements are arranged in the first heat pipe and the second heat pipe and used for detecting the temperature in the heat pipes, the temperature sensing elements are in data connection with a controller, and the controller controls whether hot water enters the first heat exchanger and the second heat exchanger for heat exchange according to the detected temperature;
the heat exchange steps of the first heat pipe and the second heat pipe are as follows:
1) the first valve and the third valve are opened, and the second valve and the fourth valve are closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and a tube bundle in the second heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
2) the temperature detected by the temperature sensing element in the second heat pipe is higher than a certain value, at the moment, the controller controls the second valve and the fourth valve to be opened, and the first valve and the third valve are closed, so that hot water enters the first heat exchanger for heat exchange and does not enter the second heat exchanger, and the pipe bundle in the first heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
3) when the temperature detected by the temperature sensing element in the first heat pipe is higher than a certain value, the controller controls the first valve and the third valve to be opened, and the second valve and the fourth valve to be closed, so that hot water enters the second heat exchanger for heat exchange and does not enter the first heat exchanger, and the pipe bundle in the second heat pipe vibrates, thereby achieving the purposes of heat transfer enhancement and descaling;
and then continuously repeating the steps 2) and 3) so as to realize the alternate heat exchange of the first heat pipe and the second heat pipe.
2. A ground source heat pump system comprises a ground heat pump unit and an underground water network system, wherein the underground water network system comprises a heat pipe heat exchanger, a hot water dam, a heat exchanger, a turbine and a cold water dam which are sequentially connected through pipelines, water of the cold water dam enters the heat pipe heat exchanger, the heat pipe heat exchanger absorbs underground heat energy of a mine, then the water enters the hot water dam, then the water enters the heat exchanger of the ground heat pump unit from the hot water dam to release heat, and then the water enters the cold water dam through the turbine to finish a cycle; the ground heat pump unit comprises a circulation loop consisting of a heat exchanger, a compressor, a water-cooled condenser, a liquid storage device and a throttle valve which are sequentially connected through pipelines, a refrigerant absorbs heat in the heat exchanger, enters the compressor for compression and then enters the condenser for heat release, the refrigerant after heat release enters the liquid storage device and then enters the heat exchanger from the liquid storage device through the throttle valve to form circulation; the water-cooled condenser comprises a cold water inlet and a hot water outlet, and water enters the water-cooled condenser through the cold water inlet, absorbs heat and then flows out through the hot water outlet; the heat exchanger is the heat exchanger combination of claim 1.
CN202010279800.7A 2020-04-10 2020-04-10 Temperature descaling heat exchanger combination and ground source heat pump system thereof Active CN112985131B (en)

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Citations (5)

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CN102331053A (en) * 2011-05-03 2012-01-25 神华集团有限责任公司 Heat pump system
CN102419040A (en) * 2011-12-06 2012-04-18 安徽日源环保能源科技有限公司 Water source flow control device of water source heat pump system
CN103673395A (en) * 2013-12-12 2014-03-26 江苏海宏机械制造有限公司 Domestic ground-source thermal pump system
CN109974062A (en) * 2019-03-25 2019-07-05 大连理工大学 A kind of fume afterheat depth recovery system using absorption heat pump and two-stage heat exchanger
CN110736089A (en) * 2018-04-03 2020-01-31 青岛鑫众合贸易有限公司 steam generator with valve controlled by water temperature

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102331053A (en) * 2011-05-03 2012-01-25 神华集团有限责任公司 Heat pump system
CN102419040A (en) * 2011-12-06 2012-04-18 安徽日源环保能源科技有限公司 Water source flow control device of water source heat pump system
CN103673395A (en) * 2013-12-12 2014-03-26 江苏海宏机械制造有限公司 Domestic ground-source thermal pump system
CN110736089A (en) * 2018-04-03 2020-01-31 青岛鑫众合贸易有限公司 steam generator with valve controlled by water temperature
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