Heat energy recovery drying machine with gas consumption compression heat

Abstract

The utility model discloses a gas consumption compression heat energy recovery drying machine which comprises a first adsorption tower and a second adsorption tower which are arranged in parallel, a lower pipe system is arranged at the bottom of the first adsorption tower and the bottom of the second adsorption tower, and an upper pipe system is arranged at the top of the first adsorption tower and the top of the second adsorption tower. The system further comprises a controller, an electric heater, a direct air inlet cooling valve, a heat energy recovery unit, a rear cooler, a gas-liquid separator and a freezing dryer, a hot water outlet of the heat energy recovery unit is provided with a temperature control electric adjusting valve, and the electric heater, the heat energy recovery unit, the temperature control electric adjusting valve and the freezing dryer are electrically connected with the controller. The deeper dry gas can be stably output, and stable hot water output can be provided while the dew point is met.

Description

Technical Field

[0001] The utility model relates to the technical field of dryers, in particular to a dryer with air consumption compression heat energy recovery. Background Art

[0002] Compression heat regeneration adsorption dryer is the most energy-saving product in the compressed air post-treatment industry. It uses the high-temperature compressed air generated when the compressor compresses the gas to regenerate the adsorbent.

[0003] At present, electric heaters are mainly used to increase the intake temperature to adjust the intake regeneration temperature of compression heat regeneration adsorption dryers, but most of them cannot fully utilize the excess heat energy emitted during the operation process. Most compression heat regeneration adsorption dryers on the market use traditional heat recovery devices, which cannot achieve the functions of stable dew point and stable hot water output, and can often only obtain dry gas with a dew point of less than -40℃. Utility Model Content

[0004] The utility model provides a heat recovery dryer with air consumption compression heat to solve the above technical problems.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A heat recovery dryer with compression heat of gas consumption, comprising a first adsorption tower and a second adsorption tower arranged in parallel, a lower pipe system is provided at the bottom of the first adsorption tower and the second adsorption tower, the lower pipe system comprises an air inlet pipe, an upper pipe system is provided at the top of the first adsorption tower and the second adsorption tower, the upper pipe system comprises an air outlet and a regeneration pipe connected to an air outlet through an A node, the upper pipe system and the lower pipe system are respectively provided with a plurality of pneumatic valves, and also comprises a controller, an electric heater, a direct air intake cooling valve, a heat recovery unit, a rear cooler, a gas-liquid separator, and a cold dryer, one end of the electric heater is connected to a compressed air inlet, and the other end of the electric heater is connected to a compressed air inlet. One end of the direct air intake cooling valve and the B node of the air outlet and regeneration pipeline are respectively connected, the other end of the direct air intake cooling valve is respectively connected to the inlet of the heat recovery unit and the C node of the air intake pipeline, the outlet of the heat recovery unit is connected to the inlet of the rear cooler, the outlet of the rear cooler is connected to the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected to the inlet of the cold dryer, and the outlet of the cold dryer is connected to the D node of the air intake pipeline; the hot water outlet of the heat recovery unit is provided with a temperature-controlled electric regulating valve, and the electric heater, the heat recovery unit, the temperature-controlled electric regulating valve, and the cold dryer are electrically connected to the controller respectively.

[0007] Preferably, the air outlet and regeneration pipeline is provided with a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a first cold blow air inlet valve, a second cold blow air inlet valve, a pressure equalizing valve and a regeneration throttling orifice plate, one end of the first pneumatic valve, one end of the third pneumatic valve, and one end of the first cold blow air inlet valve are respectively connected to the top outlet of the first adsorption tower, one end of the second pneumatic valve, one end of the fourth pneumatic valve, and one end of the second cold blow air inlet valve are respectively connected to the top outlet of the second adsorption tower, the other end of the first pneumatic valve, the other end of the second pneumatic valve, and one end of the regeneration throttling orifice plate are respectively connected to node A, the other end of the third pneumatic valve and the other end of the fourth pneumatic valve are respectively connected to node B, the two ends of the pressure equalizing valve are respectively connected to the top outlet of the first adsorption tower and the top outlet of the second adsorption tower, the other end of the first cold blow air inlet valve, the other end of the second cold blow air inlet valve, and the other end of the regeneration throttling orifice plate are connected.

[0008] Preferably, the air intake pipeline is provided with a fifth pneumatic valve, a sixth pneumatic valve, a seventh pneumatic valve and an eighth pneumatic valve; one end of the fifth pneumatic valve and one end of the seventh pneumatic valve are respectively connected to the bottom inlet of the first adsorption tower, one end of the sixth pneumatic valve and one end of the eighth pneumatic valve are respectively connected to the bottom inlet of the second adsorption tower, the other end of the fifth pneumatic valve and the other end of the sixth pneumatic valve are connected to the C node of the air intake pipeline, and the other end of the seventh pneumatic valve and the other end of the eighth pneumatic valve are connected to the D node of the air intake pipeline.

[0009] Preferably, the bottom inlet of the first adsorption tower is connected to one end of the first exhaust valve and one end of the second exhaust valve, respectively, the bottom inlet of the second adsorption tower is connected to one end of the third exhaust valve and one end of the fourth exhaust valve, respectively, and the other end of the first exhaust valve, the other end of the second exhaust valve, the other end of the third exhaust valve and the other end of the fourth exhaust valve are connected to a silencer exhaust device, respectively.

[0010] Preferably, each pneumatic valve is matched and connected with a pilot solenoid valve for controlling the opening and closing of the valve, and each pilot solenoid valve is electrically connected to the controller respectively.

[0011] Preferably, the rear cooler is a shell-and-tube cooler using 32°C cooling water.

[0012] Preferably, a first bypass branch is provided between the other end of the electric heater and the inlet of the gas-liquid separator, and the first bypass branch is provided with a first heat recovery bypass valve.

[0013] Preferably, a second bypass branch is provided between the other end of the direct air intake cooling valve and the inlet of the gas-liquid separator, and the second bypass branch is provided with a second heat recovery bypass valve.

[0014] Preferably, the surface of the electric heater is covered with thermal insulation cotton and aluminum sheet, temperature probes are respectively provided on the electric heater and on the pipeline connected to the outlet of the electric heater, and the gas-liquid separator is connected to a gas-liquid separator drain valve.

[0015] Preferably, the first adsorption tower and the second adsorption tower are both provided with a pressure gauge for measuring the pressure inside the adsorption tower and a temperature probe for measuring the temperature inside the adsorption tower, and the bottom inlets of the first adsorption tower and the second adsorption tower are both provided with a temperature probe.

[0016] Compared with the prior art, the utility model can stably output dry gas that can achieve a deeper degree, meet the dew point and provide stable hot water output at the same time, the temperature of the gas can be increased by an electric heater, and hot water can be recovered in both the heating and cold blowing stages by a heat recovery unit, so that waste heat can be effectively utilized and hot water can be discharged according to the demand for hot water, and the gas separated from the gas-liquid separator is passed through a cold dryer to reduce the air intake load, thereby obtaining dry gas with a low dew point and high performance, and the dew point can be achieved below -50°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a structural schematic diagram of a heat recovery dryer with air consumption and compression heat.

[0018] In the figure, 1-the first adsorption tower, 2-the second adsorption tower, 3-the electric heater, 4-the direct air intake cooling valve, 5-the heat recovery unit, 6-the temperature control electric regulating valve, 7-the rear cooler, 8-the gas-liquid separator, 9-the cold dryer, 10-the silencer exhaust device, 11-the first pneumatic valve, 12-the second pneumatic valve, 13-the third pneumatic valve, 14-the fourth pneumatic valve, 15-the first cold blowing air intake valve, 16-the second cold blowing air intake valve, 17-the pressure equalizing valve, 18-the regeneration throttling orifice, 19-the fifth pneumatic valve, 20-the sixth pneumatic valve, 21-the seventh pneumatic valve, 22-the eighth pneumatic valve, 23-the first heat recovery bypass valve, 24-the second heat recovery bypass valve, 25-the first exhaust valve, 26-the second exhaust valve, 27-the third exhaust valve, 28-the fourth drain valve, 29-the gas-liquid separator drain valve. DETAILED DESCRIPTION

[0019] The present invention will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present invention, and any structural, methodological, or functional changes made by a person skilled in the art based on these embodiments are all within the scope of protection of the present invention.

[0020] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0021] like Figure 1 As shown, a heat recovery dryer with compression heat of gas consumption includes a first adsorption tower 1 and a second adsorption tower 2 arranged in parallel. The first adsorption tower 1 and the second adsorption tower 2 are provided with a lower pipe system at the bottom, and the lower pipe system includes an air intake pipeline. The first adsorption tower 1 and the second adsorption tower 2 are provided with an upper pipe system at the top, and the upper pipe system includes an air outlet and a regeneration pipeline connected to the air outlet through an A node. The upper pipe system and the lower pipe system are respectively provided with a plurality of pneumatic valves, and also include a controller, an electric heater 3, a direct air intake cooling valve 4, a heat recovery unit 5, a rear cooler 7, a gas-liquid separator 8, and a cold dryer 9. One end of the electric heater 3 is connected to the compressor The compressed air inlet, the other end of the electric heater 3 is respectively connected to one end of the direct air intake cooling valve 4 and the B node of the air outlet and regeneration pipeline, the other end of the direct air intake cooling valve 4 is respectively connected to the inlet of the heat recovery unit 5 and the C node of the air intake pipeline, the outlet of the heat recovery unit 5 is connected to the inlet of the rear cooler 7, the outlet of the rear cooler 7 is connected to the inlet of the gas-liquid separator 8, the outlet of the gas-liquid separator 8 is connected to the inlet of the cold dryer 9, and the outlet of the cold dryer 9 is connected to the D node of the air intake pipeline; the electric heater 3, the heat recovery unit 5, the temperature control electric regulating valve 6, and the cold dryer 9 are electrically connected to the controller respectively.

[0022] The utility model can increase the temperature of the gas through the electric heater 3, and can recover hot water in the heating and cold blowing stages through the heat recovery unit 5, which can effectively utilize the waste heat and discharge hot water according to the demand for hot water. The gas separated from the gas-liquid separator 8 is passed through the cold dryer 9 to reduce the air intake load, thereby obtaining a dry gas with a low dew point and high performance, and the dew point can be achieved below -50°C.

[0023] Among them, the controller can adopt a PLC controller, and can also adopt other chip control circuits with similar functions; the surface of the electric heater 3 can be covered with thermal insulation cotton and aluminum skin, and temperature probes electrically connected to the controller are respectively provided on the electric heater 3 and on the pipelines connected to the outlet of the electric heater 3. The temperature probes transmit the measured temperature data to the controller. The heating temperature of the electric heater 3 measured by the temperature probe on the electric heater 3 is used for over-temperature alarm and protection. The outlet temperature of the electric heater 3 measured by the temperature probe on the outlet pipeline of the electric heater 3 is used to control the opening of the direct air intake cooling valve 4; the heat recovery unit 5 has a tap water inlet and a hot water outlet, and the hot water outlet is provided with a temperature control electric regulator The throttle valve 6 and the temperature-controlled electric regulating valve 6 are electrically connected to the controller, collect the temperature of the outlet of the heat recovery unit 5 and transmit it to the controller, and the controller controls the hot water outlet of the heat recovery unit 5 to output hot water according to the set temperature; the rear cooler 7 can adopt a shell-and-tube cooler with 32°C cooling water, with a cooling water inlet and a cooling water outlet; the gas-liquid separator 8 is connected to the gas-liquid separator drain valve 29 for draining the gas-liquid separator 8; the cold dryer 9 is a closed-loop structure in which the four major components of the evaporator, condenser, expansion valve, and compressor refrigeration are connected by pipelines. The refrigerant circulates in the cold dryer 9 and exchanges heat with the air, thereby obtaining a stable low dew point and high-performance dry gas.

[0024] The gas outlet and regeneration pipeline is provided with a first pneumatic valve 11, a second pneumatic valve 12, a third pneumatic valve 13, a fourth pneumatic valve 14, a first cold blowing air inlet valve 15, a second cold blowing air inlet valve 16, a pressure equalizing valve 17 and a regeneration throttling orifice 18. One end of the first pneumatic valve 11, one end of the third pneumatic valve 13, and one end of the first cold blowing air inlet valve 15 are respectively connected to the top outlet of the first adsorption tower 1, and one end of the second pneumatic valve 12, one end of the fourth pneumatic valve 1, and one end of the second cold blowing air inlet valve 16 are respectively connected to the top outlet of the first adsorption tower 1. The top outlet of the second adsorption tower 2 is connected, the other end of the first pneumatic valve 11, the other end of the second pneumatic valve 12, and one end of the regeneration throttling orifice are respectively connected to the A node, the other end of the third pneumatic valve and the other end of the fourth pneumatic valve are respectively connected to the B node, the two ends of the equalizing valve 17 are respectively connected to the top outlet of the first adsorption tower 1 and the top outlet of the second adsorption tower 2, the other end of the first cold blowing air intake valve 15, the other end of the second cold blowing air intake valve 16, and the other end of the regeneration throttling orifice 18 are connected. The first pneumatic valve 11, the second pneumatic valve 12, the third pneumatic valve 13, and the fourth pneumatic valve 14 are used in the heating stage; the equalizing valve 17 is used to control the flow of the upper pipe system to achieve the purpose of balancing the air pressure; the first cold blowing air intake valve 15, the second cold blowing air intake valve 16, and the regeneration throttling orifice 18 are used in the cold blowing stage, and the regeneration throttling orifice 18 can adjust the regeneration reflux gas flow. The pipeline in front of the limiting orifice 18 can be provided with a manual stop valve to facilitate manual control and shutdown.

[0025] The air intake pipeline is provided with a fifth pneumatic valve 19, a sixth pneumatic valve 20, a seventh pneumatic valve 21 and an eighth pneumatic valve 22. One end of the fifth pneumatic valve 19 and one end of the seventh pneumatic valve 21 are respectively connected to the bottom inlet of the first adsorption tower 1, one end of the sixth pneumatic valve 20 and one end of the eighth pneumatic valve 22 are respectively connected to the bottom inlet of the second adsorption tower 2, the other end of the fifth pneumatic valve 19 and the other end of the sixth pneumatic valve 20 are connected to the C node of the air intake pipeline, and the other end of the seventh pneumatic valve 21 and the other end of the eighth pneumatic valve 22 are connected to the D node of the air intake pipeline.

[0026] Each pneumatic valve is matched with a pilot solenoid valve for controlling the opening and closing of the valve, and each pilot solenoid valve is electrically connected to the controller. The pneumatic valve realizes the air intake or exhaust of the connected adsorption tower by pneumatic means, and the pilot solenoid valve controls the opening or closing of the corresponding pneumatic valve under the control of the controller. The number and position of the pneumatic valve and the pilot solenoid valve can be set according to the actual needs of the adsorption tower.

[0027] The bottom inlet of the first adsorption tower 1 is respectively connected to one end of the first exhaust valve 25 and one end of the second exhaust valve 26, the bottom inlet of the second adsorption tower 2 is respectively connected to one end of the third exhaust valve 27 and one end of the fourth exhaust valve 28, and the other ends of the first exhaust valve 25, the second exhaust valve 26, the third exhaust valve 27 and the fourth exhaust valve 28 are respectively connected to the silencer exhaust device 10. The two adsorption towers each have two exhaust valves to form a two-stage exhaust, and the silencer exhaust device 10 is used for silencing and final discharge of the gas.

[0028] A first bypass branch may be provided between the other end of the electric heater 3 and the inlet of the gas-liquid separator 8, and the first bypass branch is provided with a first heat recovery bypass valve 23; a second bypass branch may be provided between the other end of the direct air intake cooling valve 4 and the inlet of the gas-liquid separator 8, and the second bypass branch is provided with a second heat recovery bypass valve 24. By providing two bypass branches, the first heat recovery bypass valve 23 or the second heat recovery bypass valve 24 may be opened when necessary, so that the working medium flowing out of the electric heater 3 can bypass the heat recovery unit 5 and flow into the rear cooler 7.

[0029] The first adsorption tower 1 and the second adsorption tower 2 are both provided with a pressure gauge for measuring the pressure inside the adsorption tower and a temperature probe for measuring the temperature inside the adsorption tower, and the bottom entrances of the first adsorption tower 1 and the second adsorption tower 2 are both provided with a temperature probe. The above-mentioned temperature probe and pressure gauge transmit the measured temperature or pressure data to the controller respectively, and through the setting of these temperature probes and pressure gauges, the temperature and pressure parameters inside the adsorption tower and each pipeline node can be obtained in real time, so as to better regulate and control the electric heater 3, the cold dryer 9 and other equipment.

[0030] The two adsorption towers of the utility model can be regenerated alternately. The working process of the utility model is specifically described in two situations below.

[0031] 1. The first adsorption tower 1 is heated, and the second adsorption tower 2 is adsorbed:

[0032] Heating stage: air inlet → electric heater 3 (on) → third pneumatic valve 13 → first adsorption tower 1 heating regeneration → fifth pneumatic valve 19 → heat recovery unit 5 → rear cooler 7 → gas-liquid separator 8 → cold dryer 9 → eighth pneumatic valve 22 → second adsorption tower 2 adsorption → second pneumatic valve 12 → air outlet.

[0033] Cold blowing stage: air inlet → electric heater 3 (off) → direct air intake cooling valve 4 → heat recovery unit 5 → rear cooler 7 → gas-liquid separator 8 → cold dryer 9 → eighth pneumatic valve 22 → second adsorption tower 2 adsorption → second pneumatic valve 12 → air outlet. Among them, the gas part after adsorption by the second adsorption tower 2 can flow back to the first adsorption tower 1 for cold blowing through the flow limiting orifice 18: second adsorption tower 2 adsorption → second pneumatic valve 12 → flow limiting orifice 18 → first cold blowing air intake valve 15 → first adsorption tower 1 cold blowing → first exhaust valve 25 / second exhaust valve 26 → silencer exhaust device 10.

[0034] 2. The second adsorption tower 2 is heated, and the first adsorption tower 1 is adsorbed:

[0035] Heating stage: air inlet → electric heater 3 (on) → fourth pneumatic valve 14 → second adsorption tower 2 heating and regeneration → sixth pneumatic valve 20 → heat recovery unit 5 → rear cooler 7 → gas-liquid separator 8 → cold dryer 9 → seventh pneumatic valve 21 → first adsorption tower 1 adsorption → first pneumatic valve 11 → air outlet.

[0036] Cold blowing stage: air inlet → electric heater 3 (off) → direct air intake cooling valve 4 → heat recovery unit 5 → rear cooler 7 → gas-liquid separator 8 → cold dryer 9 → seventh pneumatic valve 21 → first adsorption tower 1 adsorption → first pneumatic valve 11 → air outlet. Among them, the gas part after adsorption by the first adsorption tower 1 can flow back to the second adsorption tower 2 for cold blowing through the flow limiting orifice 18: first adsorption tower 1 adsorption → first pneumatic valve 11 → flow limiting orifice 18 → second cold blowing air intake valve 16 → second adsorption tower 2 cold blowing → third exhaust valve 27 / fourth exhaust valve 28 → silencer exhaust device 10.

[0037] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the claims of the present application.

[0038] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A heat recovery dryer with air consumption compression heat, characterized in that: It includes a first adsorption tower and a second adsorption tower arranged in parallel, a lower pipe system is provided at the bottom of the first adsorption tower and the second adsorption tower, the lower pipe system includes an air intake pipeline, an upper pipe system is provided at the top of the first adsorption tower and the second adsorption tower, the upper pipe system includes an air outlet and a regeneration pipeline connected to the air outlet through an A node, the upper pipe system and the lower pipe system are respectively provided with a plurality of pneumatic valves, and also include a controller, an electric heater, a direct air intake cooling valve, a heat recovery unit, a rear cooler, a gas-liquid separator, and a cold dryer, one end of the electric heater is connected to a compressed air inlet, and the other end of the electric heater is connected to a direct air intake. One end of the cooling valve, the B node of the air outlet and the regeneration pipeline, the other end of the direct air intake cooling valve is respectively connected to the inlet of the heat recovery unit and the C node of the air intake pipeline, the outlet of the heat recovery unit is connected to the inlet of the rear cooler, the outlet of the rear cooler is connected to the inlet of the gas-liquid separator, the outlet of the gas-liquid separator is connected to the inlet of the cold dryer, and the outlet of the cold dryer is connected to the D node of the air intake pipeline; the hot water outlet of the heat recovery unit is provided with a temperature-controlled electric regulating valve, and the electric heater, the heat recovery unit, the temperature-controlled electric regulating valve, and the cold dryer are electrically connected to the controller respectively.

2. A heat recovery dryer with compression heat according to claim 1, characterized in that: The air outlet and regeneration pipeline is provided with a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a first cold blowing air inlet valve, a second cold blowing air inlet valve, a pressure equalizing valve and a regeneration throttling orifice plate. One end of the first pneumatic valve, one end of the third pneumatic valve and one end of the first cold blowing air inlet valve are respectively connected to the top outlet of the first adsorption tower, one end of the second pneumatic valve, one end of the fourth pneumatic valve and one end of the second cold blowing air inlet valve are respectively connected to the top outlet of the second adsorption tower, the other end of the first pneumatic valve, the other end of the second pneumatic valve and one end of the regeneration throttling orifice plate are respectively connected to node A, the other end of the third pneumatic valve and the other end of the fourth pneumatic valve are respectively connected to node B, the two ends of the pressure equalizing valve are respectively connected to the top outlet of the first adsorption tower and the top outlet of the second adsorption tower, the other end of the first cold blowing air inlet valve, the other end of the second cold blowing air inlet valve and the other end of the regeneration throttling orifice plate are connected.

3. The heat recovery dryer with compression heat of gas consumption according to claim 1 is characterized in that: The air intake pipeline is provided with a fifth pneumatic valve, a sixth pneumatic valve, a seventh pneumatic valve and an eighth pneumatic valve; one end of the fifth pneumatic valve and one end of the seventh pneumatic valve are respectively connected to the bottom inlet of the first adsorption tower, one end of the sixth pneumatic valve and one end of the eighth pneumatic valve are respectively connected to the bottom inlet of the second adsorption tower, the other end of the fifth pneumatic valve and the other end of the sixth pneumatic valve are connected to the C node of the air intake pipeline, and the other end of the seventh pneumatic valve and the other end of the eighth pneumatic valve are connected to the D node of the air intake pipeline.

4. The heat recovery dryer with compression heat of gas consumption according to claim 1 is characterized in that: The bottom inlet of the first adsorption tower is respectively connected to one end of the first exhaust valve and one end of the second exhaust valve, the bottom inlet of the second adsorption tower is respectively connected to one end of the third exhaust valve and one end of the fourth exhaust valve, the other end of the first exhaust valve, the other end of the second exhaust valve, the other end of the third exhaust valve and the other end of the fourth exhaust valve are respectively connected to the silencer exhaust device.

5. The heat recovery dryer with compression heat of gas consumption according to claim 1, characterized in that: Each of the pneumatic valves is matched and connected with a pilot solenoid valve for controlling the opening and closing of the valve, and each of the pilot solenoid valves is electrically connected to the controller respectively.

6. The heat recovery dryer with compression heat of gas consumption according to claim 1, characterized in that: The rear cooler is a shell-and-tube cooler using 32° C. cooling water.

7. The heat recovery dryer with compression heat of gas consumption according to claim 1, characterized in that: A first bypass branch is provided between the other end of the electric heater and the inlet of the gas-liquid separator, and the first bypass branch is provided with a first heat recovery bypass valve.

8. The heat recovery dryer with compression heat of gas consumption according to claim 1, characterized in that: A second bypass branch is provided between the other end of the direct air intake cooling valve and the inlet of the gas-liquid separator, and the second bypass branch is provided with a second heat recovery bypass valve.

9. The heat recovery dryer with compression heat of gas consumption according to claim 1, characterized in that: The surface of the electric heater is covered with heat-insulating cotton and aluminum sheet, temperature probes are respectively arranged on the electric heater and on the pipeline connected to the outlet of the electric heater, and the gas-liquid separator is connected with a gas-liquid separator drain valve.

10. A heat recovery dryer with compression heat with gas consumption according to any one of claims 1 to 9, characterized in that: The first adsorption tower and the second adsorption tower are both provided with a pressure gauge for measuring the pressure inside the adsorption tower and a temperature probe for measuring the temperature inside the adsorption tower. The bottom inlets of the first adsorption tower and the second adsorption tower are both provided with a temperature probe.

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