CN106482557A - The heat chemistry absorption heat-pipe apparatus that a kind of utilization low grade heat energy drives - Google Patents

Abstract

The invention discloses a thermochemical adsorption heat pipe device driven by low-grade heat energy, comprising: a heat pipe main body (three parts of an evaporation section, a condensation section and an adiabatic section), a mass transfer channel and a liquid transfer channel, respectively arranged in the center of the heat pipe evaporation section The center and the inner wall surface are used to provide flow channels for gaseous state adsorbate and liquid state adsorbate; heat source and cold source are used to provide heating fluid or cooling fluid at a certain temperature respectively; external casing of the evaporation section and external casing of the condensation section , forming a flow heat exchange space with the outer wall of the evaporating section and the condensing section respectively; the filling pipeline of the adiabatic section is used for vacuuming the device and injecting the adsorbent working fluid; the heating fluid enters the outer casing of the evaporating section through the second inlet and outlet pipelines , exchange heat with the adsorbent and return to the heat source; the cooling fluid enters the outer sleeve of the condensation section through the first inlet and outlet pipeline, exchanges heat with the adsorbate and returns to the cold source.

Description

A thermochemical adsorption heat pipe device driven by low-grade thermal energy

technical field

The invention relates to the technical field of thermochemical adsorption and heat and mass transfer, in particular to a thermochemical adsorption heat pipe device driven by low-grade heat energy.

technical background

Low-grade heat energy widely exists in high-temperature exhaust gas from engines, waste heat from power plants, and low-temperature heat sources such as solar energy. Efficient recovery and utilization of low-temperature heat sources below 100°C have significant energy-saving effects. The traditional heat pipe is an efficient, passive and reliable heat transfer method for the evaporation-condensation phase transition of working fluid (such as water, ammonia) driven by capillary force. Its heat transfer performance is limited by viscosity limit, sound velocity limit, capillary limit, There are various restrictions such as carry-over limit, boiling limit and filling liquid quality requirements. The absorption/adsorption reaction can be used for heat recovery below 150°C, and does not require a catalyst. The working medium is not flammable in the air, and there are many optional working mediums. Among them, thermochemisorption utilizes the chemical adsorption reaction of the adsorbent on the refrigerant, which has high reaction heat and energy storage density, and has been widely used for energy storage in recent years. The problem with the thermal chemical adsorption energy storage process is that the energy storage process is relatively slow and can only be used in occasions that do not require high heat transfer processes; the reactor needs to undergo alternating heating and cooling processes and can only be used in intermittent energy storage.

Contents of the invention

The object of the present invention is to provide a thermochemical adsorption heat pipe device driven by low-grade heat energy, so as to improve the energy-saving effect.

In order to solve the above problems, the present invention combines the heat transfer mode of the heat pipe and the thermochemical adsorption reaction technology, and proposes a thermochemical adsorption heat pipe device driven by low-grade heat energy, including a heat pipe body composed of an evaporation section, an adiabatic section and a condensation section , the adiabatic section is set between the evaporating section and the condensing section, the evaporating section has a solid adsorbent adsorbed with adsorbate; the evaporating section includes a mass transfer channel and a second outer sleeve from the inside to the outside, and the inner wall of the second outer sleeve is set There are several liquid transfer channels, and the second outer casing and the outer wall of the evaporation section form a flow heat exchange space; the second outer casing is connected to the heat source through the second inlet and outlet pipelines to form a heating fluid circulation loop, and the heat source is used to provide heating Fluid; the outer layer of the condensing section is the first outer casing, and the first outer casing is connected to the cold source through the first inlet and outlet pipelines to form a cooling fluid circulation loop, and the cold source is used to provide cooling fluid. The solid adsorbent absorbs the heat of the heating fluid entering the second outer sleeve, and gradually desorbs the gas adsorbate. The gas adsorbate flows from the adiabatic section to the condensation section through the mass transfer channel, and heats up with the cooling fluid entering the first outer sleeve. After the exchange, it gradually condenses into a liquid state and returns to the evaporation section through the liquid transfer channel; the heating fluid exchanges heat with the solid adsorbent and returns to the heat source, and the cooling fluid exchanges heat with the gas adsorbate and returns to the cold source. It should be understood that a cold source requires some means of recovering heat.

Preferably, the adiabatic section communicates with a filling pipeline for vacuuming the device and/or injecting adsorbate working fluid.

Preferably, the first inlet and outlet pipelines are respectively connected to the heat source and the second outer sleeve of the evaporation section to form a heating fluid circulation loop; the second inlet and outlet pipelines are respectively connected to the cold source and the first outer sleeve of the condensation section to form a cooling fluid Circulation loop; wherein, the heating fluid enters the second outer casing of the evaporation section through the pipeline, exchanges heat with the adsorbent and returns to the heat source; the cooling fluid enters the first outer casing of the condensation section through the pipeline, and conducts heat exchange with the adsorbate Return to the cold source after heat exchange.

Preferably, a valve is arranged on the filling pipeline, and the valve remains closed after the device is vacuumed and/or the adsorbate working fluid is injected.

Preferably, the inside of the evaporating section is filled with a reaction working medium pair for thermochemical adsorption reaction, which absorbs the heat of the heating fluid in the first outer casing of the above-mentioned evaporating section, gradually desorbs the gas adsorbate, and passes through the above-mentioned mass transfer channel by adiabatic The gas adsorbate gradually condenses into a liquid state and flows back to the evaporation section through the heat absorption of the cooling fluid in the first outer casing of the above-mentioned condensation section, completing the process of heating desorption and condensation reflux.

Beneficial effect:

Compared with traditional adsorption heat pipes, the present invention combines thermal chemical adsorption and heat pipe heat transfer, uses low-grade heat energy to provide activation energy for chemical working fluids, and further improves the heat absorption and exothermic changes during the chemical change process. Energy conversion efficiency and rate, and not limited by viscosity limit, sound velocity limit, capillary limit, carry limit, boiling limit, and liquid filling quality requirements; the reaction does not require a catalyst, and the working medium is not flammable in air and can be There are many working fluids selected, which can efficiently recycle low-temperature heat sources below 100 degrees Celsius, and can cope with occasions with high heat exchange requirements. The reactor does not need to go through alternating heating and cooling processes, and can continuously store energy .

Description of drawings

Fig. 1 is a schematic diagram of a cross-sectional structure of a heat pipe evaporation section according to an embodiment of the present invention;

FIG. 2 is an overall schematic diagram of a heat pipe device according to an embodiment of the present invention.

Label description

1-Condenser section, 2-First outer casing, 3-Adiabatic section, 4-Valve, 5-Filling pipeline, 6-Mass transfer channel, 7-Evaporation section, 8-Second outer casing, 9- Liquid transmission channel, 10-first inlet and outlet pipeline, 11-heat source, 12-cooling source, 13-second inlet and outlet pipeline.

detailed description

In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described here, and those skilled in the art can make similar extensions without violating the connotation of the present invention, so the present invention is not limited by the specific implementations disclosed below.

As shown in Figure 1, the heat pipe evaporation section 7 provided by the embodiment of the present invention includes a second outer sleeve 8 of the evaporation section, a mass transfer channel 6 and a liquid transfer channel 9, and the second outer sleeve 8 of the evaporation section is used to provide The space for heat exchange between the heating fluid and the heat pipe, the mass transfer channel 6 and the liquid transfer channel 9 are respectively used to provide flow spaces for the gaseous adsorbate and the liquid state adsorbate.

Before the main body of the heat pipe is processed and shaped, in the internal space of the evaporation section except the mass transfer channel 6, the second outer casing 8 and the liquid transfer channel 9, a certain mass of adsorbent working fluid for the above thermochemical adsorption reaction is pre-filled. .

As shown in Figure 2, in addition to the evaporation section structure shown in Figure 1, it also includes: heat pipe condensation section 1, the first outer casing 2 of the condensation section, adiabatic section 3, valve 4, charging pipeline 5, the first An inlet and outlet pipeline 10 , a second inlet and outlet pipeline 13 , a heat source 11 and a cold source 12 . The heat source 11 and the cold source 12 are respectively connected to the second outer casing 8 of the above-mentioned evaporating section and the first outer casing 2 of the condensing section through pipelines to form a heat exchange fluid circulation input and output circuit for passing the temperature difference between the input and output. , to obtain the overall heat transfer performance of the heat pipe device.

Further, the number of the first inlet and outlet 10 connecting the cold source 12 and the first outer casing 2 is preferably two to three, and if there is only one, it is not conducive to the connection between the cooling fluid in the cold source 12 and the first outer casing 2. The fluid that absorbs the superheat in the medium is exchanged, and if the quantity is too large, the complexity of the equipment will be increased; similarly, the number of the second inlet and outlet 13 connecting the heat source 11 and the second outer casing 8 is preferably two to three.

According to an embodiment of the present invention, the heat insulation section includes a filling pipeline 5 for vacuuming the device and/or injecting adsorbate working fluid.

According to an embodiment of the present invention, the filling pipeline 5 at the insulation section includes a valve 4, and the valve 4 remains closed after the device is evacuated and/or the adsorbate working fluid is injected.

The working principle of this embodiment is as follows:

After the filling pipeline 5 at the adiabatic section is vacuumized and the adsorbate is injected, the valve 4 is kept closed. The heating fluid at a certain temperature output from the heat source 11 flows into the second outer casing 8 of the evaporation section through the pipeline, and the adsorbent with the adsorbate and working fluid adsorbed in the evaporation section 7 gradually desorbs after absorbing the heat in the heating fluid At the same time, the pressure in the evaporation section 7 gradually increases, and the desorbed high-temperature and high-pressure adsorbate gas gradually rises to the condensation section 1 along the mass transfer channel 6, and at the same time, heat exchange is performed in the outer casing 8 of the evaporation section The final fluid returns to the heat source 11 through the pipeline.

The cooling fluid at a certain temperature output from the cold source 12 flows into the outer casing 2 of the condensation section through the pipeline, and exchanges heat with the high-temperature and high-pressure gaseous adsorbate gathered in the condensation section 1, and the cooling fluid takes away the gaseous adsorbate The heat in the condensate makes it condense and gradually converts into a liquid state. Under the action of gravity, the adsorbate flows back to the evaporation section 7 through the liquid transfer channel 9. At the same time, the fluid after heat exchange in the outer casing 2 of the condensation section passes through the tube. The road gets back in the cold source 12.

In this way, the heat energy provided by the heat source 11, with the heating fluid as the carrier, transfers heat to the reaction working medium pair in the evaporation section through the heat exchange with the thermochemisorption reaction working medium pair, and the adsorbate in the reaction working medium pair is in the heat pipe device. Internally realize the spatial displacement change from the evaporating section 7 to the condensing section 1, and transfer heat to the cooling fluid provided by the cold source 12 through the same way of heat exchange, so that by means of the heating, desorption and condensation reflux process of the thermochemical adsorption reaction working medium pair, Realize efficient and continuous recovery, transmission and control of low-grade heat energy below 100°C.

What is described here is only some examples of the present invention, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to protection scope of the present invention.

Claims (4)

1. A thermochemical adsorption heat pipe device driven by low-grade thermal energy, characterized in that: it comprises a heat pipe main body composed of an evaporation section, an adiabatic section and a condensation section, and the adiabatic section is arranged between the evaporation section and the condensation section, so A solid adsorbent adsorbed with adsorbate in the evaporation section; The evaporation section includes a mass transfer channel and a second outer casing from the inside to the outside, the inner wall of the second outer casing is provided with a number of liquid transfer channels, the second outer casing and the outer wall of the evaporation section Constitute a flow heat exchange space; The second outer casing is connected to a heat source through a second inlet and outlet pipeline to form a heating fluid circulation loop, and the heat source is used to provide heating fluid; The outer layer of the condensing section is provided with a first outer casing, and the first outer casing is connected to a cold source through a first inlet and outlet pipeline to form a cooling fluid circulation loop; the cold source is used to provide cooling fluid; The solid adsorbent absorbs the heat of the heating fluid entering the second outer casing, and gradually desorbs the gas adsorbate, and the gas adsorbate flows from the heat insulating section to the condensation section through the mass transfer channel, and The cooling fluid that enters the first outer casing undergoes heat exchange and gradually condenses into a liquid state and returns to the evaporation section through the liquid transfer channel; the heating fluid returns to the evaporation section after heat exchange with the solid adsorbent To the heat source, the cooling fluid exchanges heat with the gas adsorbate and returns to the heat sink. 2. The thermochemical adsorption heat pipe device driven by low-grade thermal energy according to claim 1, characterized in that: the adiabatic section communicates with a filling pipeline for vacuuming the device and/or injecting adsorbate quality. 3. The thermochemical adsorption heat pipe device driven by low-grade thermal energy according to claim 2, characterized in that a valve is arranged on the charging pipeline, and after the device is vacuumed and/or injected with the adsorbate working medium, The valve remains closed. 4 . The thermochemisorption heat pipe device driven by low-grade heat energy according to claim 1 , further characterized in that, the inside of the evaporation section is filled with reaction working fluid pairs for thermochemisorption reaction.