Energy-consumption-free self-circulation dehydration method for compressed air

Abstract

The invention discloses an energy-consumption-free self-circulation dehydration method for compressed air, which comprises the following steps: water-containing compressed air is fed into a shell pass of a dehydration heat exchanger in a first subsystem or a second subsystem of a dehydration unit, the first subsystem comprises a first dehydration heat exchanger, and the second subsystem comprises a second dehydration heat exchanger; water-containing compressed air is fed into a vortex cooler of the vortex cooling unit, the compressed air fed into the vortex cooler generates compressed air cold air and compressed air hot air, and the compressed air cold air is fed into a tube pass of a dehydration heat exchanger of the first subsystem or the second subsystem and exchanges heat with the water-containing compressed air fed into a shell pass of the dehydration heat exchanger. And water-containing compressed air in the shell pass of the dehydration heat exchanger is refrigerated and dehydrated. According to the dehydration method, moisture in the compressed air discharged by the air compressor can be efficiently removed, the dryness of the air is improved, and the air supply requirements of various pneumatic switches or adjusting valve pieces and air source pump pieces are met.

Description

Technical Field

[0001] The present application relates to the technical field of compressed air processing, and in particular to a method for self-circulating dehydration of compressed air without energy consumption. Background Art

[0002] In the operation of VOCs recovery and treatment equipment, air compressors are often used to provide compressed air to meet the air supply needs of various pneumatic switches or regulating valves and air source pumps. However, the compressed air discharged by the air compressor contains a high amount of moisture. If this moisture is not treated, it may have an adverse effect on the operating performance and service life of valves or pumps. Summary of the invention

[0003] Purpose of the invention: The present application provides an energy-free self-circulating dehydration method for compressed air. The dehydration method of the present application can efficiently remove moisture from the compressed air discharged from the air compressor and improve the dryness of the gas to meet the air supply requirements of various pneumatic switches or regulating valves and air source pumps.

[0004] Technical solution: The embodiment of the present application provides a method for self-circulating dehydration of compressed air without energy consumption, comprising: the water-containing compressed air is sent to the shell side of the dehydration heat exchanger in the first subsystem or the second subsystem of the dehydration unit, the first subsystem includes a first dehydration heat exchanger, the second subsystem includes a second dehydration heat exchanger, and the water-containing compressed air sent to the dehydration unit has a first volume V1 mm 3 ; The water-containing compressed air is fed into the vortex cooler of the vortex cooling unit, and the water-containing compressed air fed into the vortex cooling unit has a second volume V2mm 3 The water-containing compressed air sent into the vortex cooler generates compressed air cold air and compressed air hot air. The compressed air cold air is sent into the tube side of the dehydration heat exchanger in the first subsystem or the second subsystem, and exchanges heat with the water-containing compressed air sent into the shell side of the dehydration heat exchanger. The water-containing compressed air in the shell side of the dehydration heat exchanger is refrigerated and dehydrated, and the dehydrated compressed air is sent out of the dehydration heat exchanger; the compressed air hot air is sent to the tube side of the dehydration heat exchanger in another subsystem for ice melting and water drainage.

[0005] In some embodiments, the vortex cooler includes a compressed air inlet, a cold air outlet and a hot air outlet, the water-containing compressed air is delivered into the vortex cooler from the compressed air inlet, the compressed air delivered from the cold air outlet of the vortex cooler has a first temperature T1°C, and the compressed air delivered from the hot air outlet of the vortex cooler has a second temperature T2°C, wherein the first temperature T1 ranges from -15°C to -25°C, and the second temperature T2 ranges from 80°C to 100°C.

[0006] In some embodiments, the water-containing compressed air fed into the dehydration unit has a first pressure P1 MPa, and the first pressure P1 ranges from 0.6 MPa to 0.8 MPa.

[0007] In some embodiments, the compressor exhaust volume V0mm 3 The first volume V1 mm 3 Accounting for the V0mm 3 The volume percentage is 80% to 90%, and the second volume accounts for V0mm 3 The volume percentage is 10% to 20%.

[0008] In some embodiments, the period of refrigeration and dehydration of the first subsystem or the second subsystem is T1, the period of ice melting and drainage of the first subsystem or the second subsystem is T2, and the period of waiting of the first subsystem or the second subsystem is T3, wherein T 1＝ T2+T3.

[0009] In some embodiments, the first dehydration heat exchanger and the second dehydration heat exchanger are arranged in parallel, and the first dehydration heat exchanger and the second dehydration heat exchanger are respectively connected to the vortex cooler.

[0010] In some embodiments, the cold air exhaust port of the vortex cooler is respectively connected to the inlets of the first cold air valve and the second cold air valve, the outlet of the first cold air valve is connected to the tube-side inlet of the first dehydration heat exchanger, and the outlet of the second cold air valve is connected to the tube-side inlet of the second dehydration heat exchanger; the hot air exhaust port of the vortex cooler is respectively connected to the inlets of the first hot air valve and the second hot air valve, the outlet of the first hot air valve is connected to the tube-side inlet of the first dehydration heat exchanger, and the outlet of the second hot air valve is connected to the tube-side inlet of the second dehydration heat exchanger.

[0011] In some embodiments, the first subsystem further includes a first air valve, a first dehydration air valve and a first dehydration valve; the inlet of the first air valve is used to deliver compressed air containing water at room temperature, and the outlet of the first air valve is connected to the shell side inlet of the first dehydration heat exchanger; the inlet of the first dehydration air valve is connected to the shell side outlet of the first dehydration heat exchanger, and the outlet of the first dehydration air valve delivers dehydrated compressed air; the inlet of the first dehydration valve is connected to the shell side bottom outlet of the first dehydration heat exchanger.

[0012] In some embodiments, the second subsystem further includes a second air valve, a second dehydration air valve and a second dehydration valve; the inlet of the second air valve is used to deliver compressed air at room temperature, and the outlet of the second air valve is connected to the shell side inlet of the second dehydration heat exchanger; the inlet of the second dehydration air valve is connected to the shell side outlet of the second dehydration heat exchanger, and the outlet of the second dehydration air valve delivers dehydrated compressed air; the second subsystem further includes a second dehydration valve, and the inlet of the second dehydration valve is connected to the shell side bottom outlet of the second dehydration heat exchanger.

[0013] In some embodiments, the vortex cooling unit further includes a first valve and a second valve, wherein the first valve is connected to a bottom outlet of the tube side of the first dehydration heat exchanger; and the second valve is connected to a bottom outlet of the tube side of the second dehydration heat exchanger.

[0014] Beneficial effect: The present application provides a method for self-circulating dehydration of compressed air without energy consumption, including: the water-containing compressed air is sent into the shell side of the dehydration heat exchanger in the first subsystem or the second subsystem of the dehydration unit, the first subsystem includes the first dehydration heat exchanger, and the second subsystem includes the second dehydration heat exchanger; the water-containing compressed air is sent into the vortex cooler of the vortex cooling unit, the compressed air sent into the vortex cooler generates compressed air cold air and compressed air hot air, the compressed air cold air is sent into the tube side of the dehydration heat exchanger of the first subsystem or the second subsystem, and heat is exchanged with the water-containing compressed air sent into the shell side of the dehydration heat exchanger, the water-containing compressed air in the shell side of the dehydration heat exchanger is refrigerated and dehydrated, and the dehydrated compressed air is sent out of the dehydration heat exchanger; the compressed air hot air is sent into the tube side of the dehydration heat exchanger of another subsystem for ice melting and drainage. The dehydration method of the present application can efficiently remove moisture from the compressed air discharged from the air compressor and improve the dryness of the gas to meet the air supply requirements of various pneumatic switches or regulating valve components and air source pump components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a self-circulating dehydration device for compressed air in an embodiment of the present application;

[0016] Figure numerals: 100-dehydration unit, 101-first air valve, 111-second air valve, 102-first dehydration air valve, 112-second dehydration air valve, 103-first dehydration valve, 113-second dehydration valve, 104-first dehydration heat exchanger, 114-second dehydration heat exchanger; 200-vortex cooling unit, 201-first cold air valve, 211-second cold air valve, 202-first hot air valve, 212-second hot air valve, 203-first valve, 213-second valve, 204-vortex cooler, silencer-205. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0018] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0019] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0020] The embodiment of the present application provides a self-circulating dehydration device for compressed air, and the embodiment of the present application also provides a method for performing energy-free self-circulating dehydration of compressed air using the self-circulating dehydration device. Figure 1As shown, the self-circulating dehydration device of the present application includes a dehydration unit 100 and a vortex cooling unit 200. The dehydration unit 100 includes a first subsystem and a second subsystem, the first subsystem includes a first dehydration heat exchanger 104, the second subsystem includes a second dehydration heat exchanger 114, and the vortex cooling unit 200 includes a vortex cooler 204. The first dehydration heat exchanger 104, the second dehydration heat exchanger 114 and the vortex cooler 204 of the present application cooperate with the valves set to dehydrate the water-containing compressed air discharged from the air compressor, and the first subsystem and the second subsystem are alternately performed to complete the refrigeration and dehydration, ice melting and drainage and waiting of the first subsystem and the second subsystem. The self-circulating dehydration device of the present application has no moving parts, does not require additional moving parts power input, has no danger of spark flashing, no magnetic line / radio frequency interference, is portable, lightweight, and cheap, and can therefore significantly reduce operating costs.

[0021] In some embodiments, the first dehydration heat exchanger 104 and the second dehydration heat exchanger 114 of the present application are vertical spiral tube heat exchangers, and the first dehydration heat exchanger 104 and the second dehydration heat exchanger 114 have 5 pipe connections. In the embodiment of the present application, the 5 pipe connections are: the water-containing compressed air inlet at the lower end of the shell side, the dehydrated compressed air outlet at the upper end of the shell side, the dehydrated outlet at the bottom of the shell side, the compressed air hot gas / cold air inlet at the top of the tube side (tube side inlet), and the compressed air hot gas / cold air outlet at the bottom of the tube side (tube side bottom outlet). In the embodiment of the present application, two first dehydration heat exchangers 104 and second dehydration heat exchangers 114 are arranged in parallel to cool the incoming normal temperature (25°C to 30°C, which varies due to changes in ambient temperature) water-containing compressed air for heat exchange and temperature reduction and dehydration treatment.

[0022] In some embodiments, the first subsystem further includes a plurality of valves, namely a first air valve 101, a first dehydration air valve 102 and a first dehydration valve 103; the inlet of the first air valve 101 is used to deliver compressed air at room temperature, and the outlet of the first air valve 101 is connected to the water-containing compressed air inlet (shell inlet) at the lower end of the shell side of the first dehydration heat exchanger 104; the inlet of the first dehydration air valve 102 is connected to the dehydrated compressed air outlet (shell outlet) at the upper end of the shell side of the first dehydration heat exchanger 104, and the outlet of the first dehydration air valve 102 delivers the dehydrated compressed air; the inlet of the first dehydration valve 103 is connected to the dehydration outlet (shell bottom outlet) at the bottom end of the shell side of the first dehydration heat exchanger 104.

[0023] In some embodiments, the second subsystem further includes a plurality of valves, namely a second air valve 111, a second dehydration air valve 112 and a second dehydration valve 113; the inlet of the second air valve 111 is used to deliver compressed air at room temperature, and the outlet of the second air valve 111 is connected to the water-containing compressed air inlet (shell inlet) at the lower end of the shell side of the second dehydration heat exchanger 114; the inlet of the second dehydration air valve 112 is connected to the dehydrated compressed air outlet (shell outlet) at the upper end of the shell side of the second dehydration heat exchanger 114, and the outlet of the second dehydration air valve 112 delivers the dehydrated compressed air; the inlet of the second dehydration valve 113 is connected to the dehydration outlet (shell bottom outlet) at the bottom end of the shell side of the second dehydration heat exchanger 114.

[0024] In some embodiments, the vortex cooling unit 200 includes a vortex cooler 204, which is respectively connected to the first dehydration heat exchanger 104 and the second dehydration heat exchanger 114. In some specific application examples, the vortex cooler and the dehydration heat exchanger are made of 316L or above stainless steel, which is durable and corrosion-resistant.

[0025] In some specific embodiments, the vortex cooler 204 is a vortex tube self-cooling generator, and the vortex cooler 204 has three pipe ports, namely: a normal temperature compressed air inlet (compressed air inlet) at the side end, a compressed air cold air outlet (cold air outlet) at the short side cold pipe end, and a compressed air hot air outlet (hot air outlet) at the long side hot pipe end. The working principle of the vortex cooler 204 is to generate cold air and hot air by utilizing the principle of strong convective heat transfer between the rotating blades of the fluid to form a strong vortex flow between the liquid and gas medium, and provide a cold source and a heat source for the first dehydration heat exchanger 104 and the second dehydration heat exchanger 114. The working process of the vortex cooler 204 is: the normal temperature water-containing compressed air with a certain pressure enters the vortex cooler 204 from the normal temperature compressed air inlet at the side end, and the compressed air enters the vortex cooler 204 to perform high-speed swirl motion, and the airflow rotation angular velocity near the center of the pipeline is high, while the airflow rotation angular velocity near the pipe wall is low. In this way, the air flows will constantly rub against each other, and the kinetic energy of the air flow near the center of the pipe is transferred to the air flow near the outer wall of the pipe; in the long side heat pipe, after vortex exchange, the air flow is divided into two streams: one is a hot air flow and the other is a cold air flow. The internal energy of the inner circle vortex gas is continuously converted into rotational kinetic energy, which reduces its temperature; while the gas in the outer circle obtains kinetic energy through continuous friction, and at the same time, the internal energy gradually increases, causing the temperature to rise. At the terminal of the heat pipe, a part of the compressed air is discharged from the hot air end in the form of hot air through the regulating valve; the remaining compressed air returns from the center of the rotating air flow of the heat pipe at a lower speed. This cold air flow passes through the center of the generator to form ultra-low temperature cold air, and is collected at the cold air end of the vortex cooler 204 for discharge; a small adjustable valve (the first hot air valve 202 and the second hot air valve 212) is installed at the end of the hot air pipe, and there is a manual adjustment knob. The temperature and airflow of the cold air flow can be manually adjusted by adjusting the knob. The smaller the refrigeration coefficient is adjusted, the lower the temperature of the cold air.

[0026] In some specific embodiments, the compressed air (compressed air cold air) delivered from the cold air outlet of the vortex cooler 204 has a first temperature T1°C, and the compressed air (compressed air hot air) delivered from the hot air outlet of the vortex cooler 204 has a second temperature T2°C. In the embodiment of the present application, the range of the first temperature T1 is -15°C to -25°C, and the range of the second temperature T2 is 80°C to 100°C. The range of the first temperature T1 and the second temperature T2 can also be adjusted according to different application environments.

[0027] In some specific embodiments, the water-containing compressed air in the present application comes from the exhaust port of the air compressor, and the compressed air discharged from the exhaust port of the air compressor has a first pressure P1 MPa. In the embodiment of the present application, the first pressure P1 ranges from 0.6MPa to 0.8MPa, and specifically, the pressure of the compressed air is controlled to be 0.6MPa. The pressure of the compressed air fed into the self-circulating dehydration device of the present application can be adjusted according to different specific application conditions.

[0028] In some embodiments, the compressed air discharged from the exhaust port of the air compressor in the embodiments of the present application is compressed air at room temperature, usually at a temperature of 25°C to 30°C.

[0029] The vortex cooler 204 of the present application does not require additional coolant, that is, the vortex cooler does not need to use Freon or other chemical refrigerants, but directly uses its own compressed air for cooling or defrosting, which reduces the use of chemical refrigerants and related environmental problems; the vortex cooler can control the cooling effect and temperature range by adjusting the input pressure and flow of compressed air, and can be adjusted dynamically, so that the vortex cooler can meet the cooling needs of different occasions.

[0030] In some embodiments, the compressed air inlet of the vortex cooler 204 is used to deliver compressed air containing water at room temperature; the cold air outlet of the vortex cooler 204 is respectively connected to the inlets of the first cold air valve 201 and the second cold air valve 211, the outlet of the first cold air valve 201 is connected to the pipe side inlet of the first dehydration heat exchanger 104, and the outlet of the second cold air valve 211 is connected to the pipe side inlet of the second dehydration heat exchanger 114; the hot air outlet of the vortex cooler 204 is respectively connected to the inlets of the first hot air valve 201 and the second hot air valve 212, the outlet of the first hot air valve 201 is connected to the pipe side inlet of the first dehydration heat exchanger 104, and the outlet of the second hot air valve 212 is connected to the pipe side inlet of the second dehydration heat exchanger 114.

[0031] In some embodiments, the vortex cooling unit 200 further includes a first valve 203 and a second valve 213, wherein the first valve 203 is connected to the bottom outlet of the tube side of the first dehydration heat exchanger 104; and the second valve 213 is connected to the bottom outlet of the tube side of the second dehydration heat exchanger 114. In some embodiments, the vortex cooling unit 200 further includes a muffler 205, which is connected to the gas outlets of the first valve 203 and the second valve 203, respectively.

[0032] The self-circulating dehydration device of the present application has a compact system design, occupies a small space, and is easy to install and maintain. This allows it to be used in various limited spaces, improving space utilization. In addition, the self-circulating dehydration device of the present application is environmentally friendly and pollution-free. The dehydration heat exchanger does not consume nitrogen, steam, hot water, and other energy during the refrigeration or defrosting process, and refrigeration does not produce any waste; there is no residue to be cleaned, which meets environmental protection requirements. The vortex cooler and dehydration heat exchanger in the self-circulating dehydration device of the present application do not require moving parts, reducing the failure rate and maintenance requirements. This makes it have high reliability and stability, suitable for long-term continuous operation, and has strong reliability.

[0033] In the present application, the self-circulating dehydration device described above is used to perform energy-free self-circulating dehydration of compressed air, including: the water-containing compressed air is sent to the shell side of the dehydration heat exchanger in the first subsystem or the second subsystem of the dehydration unit 100, the first subsystem includes the first dehydration heat exchanger 104, the second subsystem includes the second dehydration heat exchanger 114, and the water-containing compressed air sent to the dehydration unit 100 has a first volume V1 mm 3 ;

[0034] The water-containing compressed air is fed into the vortex cooler 204 of the vortex cooling unit 200. The water-containing compressed air fed into the vortex cooling unit 200 has a second volume V2mm 3 , the water-containing compressed air fed into the vortex cooler 204 generates compressed air cold gas and compressed air hot gas;

[0035] The cold compressed air is sent to the tube side of the dehydration heat exchanger in the first subsystem or the second subsystem to exchange heat with the water-containing compressed air sent to the shell side of the dehydration heat exchanger. The water-containing compressed air in the shell side of the dehydration heat exchanger is refrigerated and dehydrated, and the dehydrated compressed air is sent out of the dehydration heat exchanger; the hot compressed air is sent to the tube side of the dehydration heat exchanger in another subsystem to melt ice and drain water;

[0036] Air compressor exhaust volume V0mm 3 The total volume of compressed air V0mm is fed into the dehydration unit 100 and the vortex cooling unit 200. 3 Meter, first volume V1 mm 3 V0mm 3 The volume percentage is 80% to 90%, and the second volume occupies the V0mm 3 The volume percentage is 10% to 20%.

[0037] In some specific embodiments, the energy-free self-circulating dehydration method of compressed air of the present application includes:

[0038] (1) Refrigeration and dehydration of the first subsystem (time T1): the first cold air valve 201, the second hot air valve 212, the first air valve 101, the first dehydration air valve 102 and the second dehydration air valve 113 are opened, and the second cold air valve 211, the first hot air valve 202, the second air valve 111 and the second dehydration air valve 112 are closed at the same time;

[0039] The water-containing compressed air first enters the vortex cooler 204 to generate cold air, enters from the inlet of the first cold air valve 201, is sent out through the outlet of the first cold air valve 201, and enters the tube side of the first dehydration heat exchanger 104 from the top. The cold air serves as a cold source to provide a cold field outside the tube; at the same time, another stream of water-containing compressed air enters from the inlet of the first air valve 101, is sent out through the outlet of the first air valve 101, and enters the shell side cold field of the first dehydration heat exchanger 104 from the bottom. After the normal temperature compressed air is cooled, frozen and dehydrated in the cold field, the dry compressed air is discharged from the upper part of the shell side of the first dehydration heat exchanger 104. The cold air in the pipe absorbs heat and heats up before being discharged from the bottom of the pipe of the first dehydration heat exchanger 104, and reaches the inlet of the first valve 203, and is directly discharged through the outlet of the first valve 203, and is silenced by the muffler 205 connected to the air outlet of the first valve 203; as time goes by, the ice outside the pipe of the first dehydration heat exchanger 104 becomes thicker and thicker, and when the time reaches the period T1, the ice forming mode outside the pipe of the first dehydration heat exchanger 104 is switched to the ice melting mode;

[0040] The first subsystem melts ice and drains water (time T2+time T3): the second cold air valve 211, the first hot air valve 202, the second air valve 111, the second dehydration air valve 112 and the first dehydration valve 103 are opened, and the first cold air valve 201, the second hot air valve 212, the first air valve 101 and the first dehydration air valve 102 are closed at the same time; a stream of water-containing compressed air first enters the vortex cooler 204 to generate hot air, enters from the inlet of the first hot air valve 202, is sent out through the outlet of the first hot air valve 202, and enters the tube side of the first dehydration heat exchanger 104 from the top. The hot air acts as a heat source to provide a heating field outside the tube, so that the ice aggregated outside the tube absorbs heat and melts into water. The water flows to the bottom of the shell side and is discharged, and enters the first dehydration valve 103, and is discharged through the outlet of the first dehydration valve 103. As time goes by, the ice is completely melted within the period T2, and it enters the waiting mode, and the time is T3;

[0041] At the same time, the second subsystem enters the refrigeration and dehydration mode (time is T1), another stream of water-containing compressed air enters from the inlet of the second air valve 111, is sent out through the outlet of the second air valve 111, and enters the shell side cold field of the second dehydration heat exchanger 114 from the lower part. After the normal temperature compressed air is cooled, frozen and dehydrated in the cold field, the dry compressed air is discharged from the upper part of the shell side of the second dehydration heat exchanger 114 and enters the second dehydration air valve 112, and is transported to the required place through the outlet of the second dehydration air valve 112;

[0042] At the same time, the cold air in the tube absorbs heat and heats up before being discharged from the bottom of the second dehydration heat exchanger 114 tube, reaching the inlet of the second valve 213, and being directly discharged through the outlet of the second valve 213. As time goes by, the ice outside the tube of the second dehydration heat exchanger 114 becomes thicker and thicker. When the time reaches the period T1, the ice forming mode outside the tube of the second dehydration heat exchanger 114 is switched to the ice melting mode.

[0043] The second subsystem melts ice and drains water (time T2+time T3): the first cold air valve 201, the second hot air valve 212, the first air valve 101, the first dehydration air valve 102 and the second dehydration valve 113 are opened, and the second cold air valve 211, the first hot air valve 202, the second air valve 111 and the second dehydration air valve 112 are closed at the same time; a stream of water-containing compressed air first enters the vortex cooler 204 to generate hot air, enters from the inlet of the second hot air valve 212, is sent out through the outlet of the second hot air valve 212, and enters the tube side of the second dehydration heat exchanger 114 from the top. The hot air serves as a heat source to provide a heating field for the outside of the tube, so that the ice aggregated outside the tube absorbs heat and melts into water. The water flows to the bottom of the shell side and is discharged, and enters the second dehydration valve 113, and is discharged through the outlet of the second dehydration valve 113. As time goes by, the ice is completely melted within the period T2, and it enters the waiting mode for a time of T3;

[0044] In this way, the first dehydration heat exchanger 104, the second dehydration heat exchanger 114 and the vortex cooler 204 are cycled and switched periodically by setting valves to cooperate with each other.

[0045] Application example: Taking the first subsystem as an example: a part of the compressed air containing water vapor at room temperature compressed from the air compressor (about 10% to 20% of the exhaust volume of the air compressor) enters the vortex tube self-cooling generator of the vortex cooler 204 from the side nozzle, and undergoes a series of actions such as vortex flow, expansion acceleration, high-speed rotation, vortex cross-heat transfer, energy separation, temperature regulation, and gas discharge to simultaneously generate low-temperature compressed air cold air and high-temperature compressed air hot air; the cold air passes through the first cold air valve 201 and enters the first dehydration heat exchanger 104 pipe process (i.e., inside the pipe), and the gas gradually moves down along the spiral coil; another part of the compressed air containing water vapor at room temperature compressed from the air compressor (about 80% to 90% of the exhaust volume of the air compressor) is discharged by the first air Valve 101 enters the shell of the first dehydration heat exchanger 104 (i.e., outside the tube), and the gas gradually rises along the spiral coil; the normal-temperature gas outside the tube (hot fluid) and the low-temperature gas inside the tube (cold fluid) conduct heat conduction and convection heat transfer through the wall of the spiral tube, and the heat is transferred from the hot fluid outside the tube to the cold fluid inside the tube through the tube wall. The low-temperature gas inside the tube absorbs heat and rises to about 25°C, and the normal-temperature gas outside the tube releases heat and cools to -5°C to -15°C. The water vapor in the gas is reduced to the freezing point and condenses on the outer wall of the spiral tube, and the dehydrated dry compressed air is discharged through the first dehydration air valve 102 to provide an air source for the pneumatic valve or pump; when the ice on the outer wall of the spiral tube condenses to a certain period (refrigeration and dehydration period T1), the first dehydration heat exchanger 104 in the first subsystem enters the ice melting and drainage mode. At this time, the second dehydration heat exchanger 114 in the second subsystem starts the refrigeration dehydration mode: the first air valve 101 and the first dehydration air valve 102 are closed, and the second air valve 111 and the second dehydration air valve 112 are opened, and another part of the compressed air containing water vapor at room temperature compressed by the air compressor (about 80% to 90% of the exhaust volume of the air compressor: adjustable) enters the shell side (i.e., outside the tube) of the second dehydration heat exchanger 114 through the second air valve 111, and the dry compressed air is obtained after cooling and dehydration and discharged through the second dehydration air valve 112, providing a continuous air source for the pneumatic valve or pump; at the same time, the first cold air valve 201 is closed and the second cold air valve 211 is opened, and the cold air generated by the vortex cooler 204 enters the tube side (i.e., inside the tube) of the second dehydration heat exchanger 114 through the second cold air valve 211;

[0046] The first subsystem ice-melting and drainage mode: at this moment, the first hot gas valve 202 and the first dehydration valve 103 are opened, and the hot gas generated by the vortex cooler 204 enters the first dehydration heat exchanger 104A pipe (i.e., inside the pipe) through the first hot gas valve 202. The ice (cold side) condensed on the outer wall of the pipe and the high-temperature gas (hot fluid) inside and outside conduct heat conduction and convection heat transfer through the spiral pipe wall. The heat is transferred from the hot fluid inside the pipe to the cold material outside the pipe through the pipe wall. The ice condensed on the outer wall of the pipe absorbs heat and melts into water, which flows to the bottom of the shell by its own weight and is discharged from the first dehydration valve 103. The hot gas in the pipe releases heat and drops to room temperature and is discharged to the atmosphere through the first valve 203 and the muffler 205, completing a defrosting and drainage process of the first subsystem (ice-melting and drainage cycle T2). Thus, the first subsystem completes the dehydration and ice-melting process of the compressed air containing water vapor and enters the waiting time (the waiting cycle is T3).

[0047] The first subsystem and the second subsystem operate alternately to complete the entire process of refrigeration and dehydration, ice melting and drainage, and waiting for the first subsystem and the second subsystem. The complete dehydration cycle T, T=T1+T2+T3, and T1=T2+T3, the system continuously outputs dry compressed air required by the equipment.

[0048] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] The above is a detailed introduction to the energy-free self-circulating dehydration method of compressed air provided in the embodiment of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A method for self-circulating dehydration of compressed air without energy consumption, characterized in that: include: The water-containing compressed air is fed into the shell side of the dehydration heat exchanger in the first subsystem or the second subsystem of the dehydration unit (100), the first subsystem includes the first dehydration heat exchanger (104), the second subsystem includes the second dehydration heat exchanger (114), and the water-containing compressed air fed into the dehydration unit (100) has a first volume V1 mm 3 ; The water-containing compressed air is fed into the vortex cooler (204) of the vortex cooling unit (200), and the water-containing compressed air fed into the vortex cooling unit (200) has a second volume V2mm 3 , the water-containing compressed air fed into the vortex cooler (204) generates compressed air cold gas and compressed air hot gas; The compressed air cold air is sent into the tube side of the dehydration heat exchanger in the first subsystem or the second subsystem to exchange heat with the water-containing compressed air sent into the shell side of the dehydration heat exchanger. The water-containing compressed air in the shell side of the dehydration heat exchanger is cooled and dehydrated, and the dehydrated compressed air is sent out of the dehydration heat exchanger. The hot compressed air is sent to the tube process of the dehydration heat exchanger of another subsystem to melt ice and drain water.

2. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The vortex cooler (204) comprises a compressed air inlet, a cold air outlet and a hot air outlet. The water-containing compressed air is fed into the vortex cooler (204) from the compressed air inlet. The compressed air discharged from the cold air outlet of the vortex cooler (204) has a first temperature T1°C, and the compressed air discharged from the hot air outlet of the vortex cooler (204) has a second temperature T2°C. The first temperature T1 ranges from -15°C to -25°C, and the second temperature T2 ranges from 80°C to 100°C.

3. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The water-containing compressed air fed into the dehydration unit (100) has a first pressure P1 MPa, and the first pressure P1 ranges from 0.6 MPa to 0.8 MPa.

4. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: Compressor exhaust volume V0mm 3 The first volume V1 mm 3 Accounting for the V0mm 3 The volume percentage is 80% to 90%, and the second volume accounts for V0mm 3 The volume percentage is 10% to 20%.

5. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The period of refrigeration and dehydration of the first subsystem or the second subsystem is T1, the period of ice melting and drainage of the first subsystem or the second subsystem is T2, and the period of waiting of the first subsystem or the second subsystem is T3, wherein T 1＝ T2+T3.

6. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The first dehydration heat exchanger (104) and the second dehydration heat exchanger (114) are arranged in parallel, and the first dehydration heat exchanger (104) and the second dehydration heat exchanger (114) are respectively connected to the vortex cooler (204).

7. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The cold air outlet of the vortex cooler (204) is respectively connected to the inlets of the first cold air valve (201) and the second cold air valve (211); the outlet of the first cold air valve (201) is connected to the pipe-side inlet of the first dehydration heat exchanger (104); and the outlet of the second cold air valve (211) is connected to the pipe-side inlet of the second dehydration heat exchanger (114); the hot air outlet of the vortex cooler (204) is respectively connected to the inlets of the first hot air valve (201) and the second hot air valve (212); the outlet of the first hot air valve (201) is connected to the pipe-side inlet of the first dehydration heat exchanger (104); and the outlet of the second hot air valve (212) is connected to the pipe-side inlet of the second dehydration heat exchanger (114).

8. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The first subsystem further comprises a first air valve (101), a first dehydration air valve (102) and a first dehydration valve (103); the inlet of the first air valve (101) is used to deliver compressed air containing water at room temperature, and the outlet of the first air valve (101) is connected to the shell-side inlet of the first dehydration heat exchanger (104); the inlet of the first dehydration air valve (102) is connected to the shell-side outlet of the first dehydration heat exchanger (104), and the outlet of the first dehydration air valve (102) delivers dehydrated compressed air; the inlet of the first dehydration valve (103) is connected to the shell-side bottom outlet of the first dehydration heat exchanger (104).

9. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The second subsystem further comprises a second air valve (111), a second dehydration air valve (112) and a second dehydration valve (113); the inlet of the second air valve (111) is used to deliver compressed air containing water at room temperature, and the outlet of the second air valve (111) is connected to the shell-side inlet of the second dehydration heat exchanger (114); the inlet of the second dehydration air valve (112) is connected to the shell-side outlet of the second dehydration heat exchanger (114), and the outlet of the second dehydration air valve (112) delivers dehydrated compressed air; the second subsystem further comprises a second dehydration valve (113), and the inlet of the second dehydration valve (113) is connected to the shell-side bottom outlet of the second dehydration heat exchanger (114).

10. The method for self-circulating dehydration of compressed air without energy consumption according to claim 1, characterized in that: The vortex cooling unit (200) further comprises a first valve (203) and a second valve (213), wherein the first valve (203) is connected to the bottom outlet of the tube side of the first dehydration heat exchanger (104); and the second valve (213) is connected to the bottom outlet of the tube side of the second dehydration heat exchanger (114).

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