Unpowered compressed air drying device

Abstract

The utility model discloses an unpowered compressed air drying device which comprises a first heat exchanger, a second heat exchanger and a gas-water separator, the first heat exchanger receives air discharged from a compressor, a compressed air outlet of the first heat exchanger is provided with a first temperature sensor and a first temperature control valve, and a second temperature sensor is arranged beside a first heat exchange inlet; the second heat exchanger is provided with a second heat exchange inlet, a second heat exchange outlet, a cooling medium inlet and a cooling medium outlet, the second heat exchange inlet is connected with the first heat exchange outlet, and the cooling medium inlet is provided with a second temperature control valve; the gas-water separator is provided with a separation inlet and a separation outlet, the separation inlet is connected with the second heat exchange outlet, the separation outlet is connected with the first heat exchange inlet through a connecting pipe, and the bottom of the gas-water separator is connected with a drain valve. The problems that compressed air in a high-humidity area is difficult to keep dry due to the large temperature difference between the use temperature and the pressure dew point and needs to depend on external power or increase energy consumption of a compressor for drying treatment are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressed air drying technical field especially a kind of unpowered compressed air drying device. BACKGROUND

[0002] In the area of greater humidity, the compressed air export pressure dew point temperature generated by compressor is usually between 50~60 ℃, but in the production process of textile, food processing and other industries, the compressed air using temperature required is about 60~65 ℃.Since this using temperature is close to dew point temperature, and in actual application, the temperature of compressed air is also influenced by ambient temperature, it will usually appear several degrees to tens of degrees drop, resulting in the temperature of compressed air drops to 60 ℃ below pressure dew point temperature, and then liquid water is precipitated and mixed into compressed air.This cannot meet the use requirement of those users who need to dry compressed air with pressure dew point temperature about 35 ℃.In order to solve this problem, users usually choose to use refrigeration dryer or adsorption dryer for drying treatment, but both of these two kinds of equipment need additional power consumption system or consume the energy consumption of compressor itself to run, thereby increasing the production cost of users.

[0003] For the above problems, there are two main technical challenges to be solved: one is how to ensure that the using temperature of compressed air at user end and pressure dew point keep enough temperature difference (such as 30 ℃), to keep compressed air in dry and unsaturated state;The second is how to realize the drying treatment of compressed air without relying on external power and increasing energy consumption.Therefore, it is of great significance to develop a kind of unpowered, energy-saving and environment-friendly compressed air drying device for reducing enterprise energy consumption and saving cost. INVENTION CONTENTS

[0004] The utility model aims at providing a kind of unpowered compressed air drying device, this device can solve the problem that the compressed air in the area of greater humidity is difficult to keep dry and unsaturated state due to the large temperature difference between using temperature and pressure dew point, and needs to rely on external power or increase the drying treatment of compressor energy consumption.

[0005] In order to solve the above problems, the utility model adopts the technical scheme: this unpowered compressed air drying device includes first heat exchanger, second heat exchanger and gas water separator, first heat exchanger is provided with compressed air import, compressed air export, first heat exchange import and first heat exchange export, compressed air import connects compressor air outlet, compressed air export is provided with first temperature sensor and first temperature control valve, first heat exchange import is provided with second temperature sensor, first heat exchange export communicates second heat exchanger, second heat exchanger is provided with second heat exchange import, second heat exchange export, cooling medium import and cooling medium export, second heat exchange import is connected with first heat exchange export, second heat exchange export communicates gas water separator, cooling medium import is provided with second temperature control valve, gas water separator is provided with separation import and separation export, separation import connects second heat exchange export, separation export is connected with first heat exchange import through connecting pipe, and the bottom of gas water separator is connected with drain valve.

[0006] In the technical scheme of the above unpowered compressed air drying device, a more specific technical scheme can also be: the first heat exchanger is an air-air heat exchanger.

[0007] In some possible embodiments, the compressed air import and the first heat exchange export are respectively arranged at positions close to two ends of a side wall of the first heat exchanger, the compressed air import and the first heat exchange export are opposite in direction, and the first heat exchange import and the compressed air export are coaxially arranged at two ends of the first heat exchanger.

[0008] In some possible embodiments, the first heat exchanger uses a stainless steel bellows as a heat exchange pipe, and the pressure drop is controlled to be below 5 KPa.

[0009] In some possible embodiments, the second heat exchanger is an air-water heat exchanger.

[0010] In some possible embodiments, the second heat exchange import and the second heat exchange export are respectively arranged at positions close to two ends of a side wall of the second heat exchanger, the second heat exchange import and the second heat exchange export are opposite in direction, one end of the second heat exchanger is provided with an end plate, and the other end is provided with the cooling medium import and the cooling medium export.

[0011] In some possible embodiments, the second heat exchanger uses a stainless steel sleeve aluminum sheet as a heat exchange pipe element, and the pressure drop is controlled to be below 2 KPa.

[0012] In some possible embodiments, the first heat exchanger and the second heat exchanger are both horizontal heat exchangers.

[0013] In some possible implementations, a base is provided below the gas-water separator, on which a first bracket supporting the gas-water separator and a second bracket supporting the second heat exchanger are mounted, and a third bracket connects the second heat exchanger and the first heat exchanger.

[0014] In some possible implementations, the gas-water separator is a centrifugal separator, and a wire mesh demister layer is provided inside the gas-water separator.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0016] 1. The first heat exchanger is directly connected to the compressor outlet to receive and process the compressed air, replacing the aftercooler of a traditional compressor and reducing the cost of the entire compressor unit. The second heat exchanger further reduces the temperature of the compressed air, meeting the requirements of a large temperature difference between the operating temperature and pressure dew point in areas with high humidity. The second heat exchanger also has cooling medium inlet and outlet, allowing it to be connected to the compressor's own cooling system for circulating cooling, fully utilizing the compressor's cooling resources. The cooled compressed air enters the air-water separator, where the condensed liquid water is discharged by a drain valve. The dried compressed air then re-enters the first heat exchanger via a connecting pipe before finally being output to the user, ensuring the compressed air remains dry and unsaturated at the user end. The entire unit does not use any additional power-consuming systems or consume additional energy from the compressor itself, thus reducing production costs and energy consumption. Its simple structure and easy installation require virtually no operating or maintenance costs.

[0017] 2. The first heat exchanger uses an air-to-air heat exchanger, which can exchange heat by utilizing the temperature difference in compressed air, reducing the demand for external energy and significantly improving the overall energy efficiency of the system. The structural design of the air-to-air heat exchanger helps to reduce heat loss during the heat exchange process, enhances heat transfer, and improves the uniformity and efficiency of heat exchange. The first heat exchanger uses stainless steel corrugated pipes as heat exchange tubes, which allows the fluid inside the heat exchanger to generate strong turbulence and eddies during the flow process, which can greatly improve the heat transfer efficiency between the fluid and the pipe wall, thereby improving the overall heat exchange performance. Controlling the pressure drop to below 5 kPa ensures that the heat exchanger can exchange heat efficiently while reducing the flow resistance of the fluid in the pipe.

[0018] 3、The second heat exchanger adopts air-water heat exchanger, which has high heat exchange efficiency. In the case of achieving the same drying effect, it consumes less energy than traditional heat exchanger. It can also adapt to different temperature and humidity conditions to ensure stable operation under various working conditions. It does not produce additional emissions during operation, reducing the burden on the environment. The structural design of the second heat exchanger optimizes the flow path of the cooling medium, improving the heat exchange efficiency. The second heat exchanger uses stainless steel sleeve aluminum sheet as heat exchange tube element, combining the corrosion resistance of stainless steel and the high thermal conductivity of aluminum, which can significantly improve the heat exchange efficiency. The pressure drop is controlled below 2KPa, which can reduce the flow resistance of the fluid in the heat exchange tube, improve the flow rate and flow of the fluid, and further enhance the heat exchange effect. Low pressure drop also helps to reduce energy consumption and improve energy utilization efficiency.

[0019] 4、The support structure with a base and multiple supports can improve the structural stability of the device, preventing deformation or damage during operation due to vibration or external pressure.

[0020] 5、The gas-water separator uses a centrifugal separator, which has high speed and efficiency, and can complete a large amount of gas-water separation task in a short time, improving the overall work efficiency. The wire mesh demister layer as an additional structure of the gas-water separator can further remove mist and small water droplets in the gas, helping to improve the purity and quality of the gas and ensure the normal operation of the subsequent process. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural diagram of the present unpowered compressed air drying device.

[0022] Figure 2 is a front view of the present unpowered compressed air drying device.

[0023] Figure 3 is Figure 2 the left view.

[0024] Figure 4 is a fluid path diagram of the present unpowered compressed air drying device.

[0025] BRIEF DESCRIPTION OF DRAWINGS: 1, first temperature control valve; 2, compressed air outlet; 3, first temperature sensor; 4, compressed air inlet; 5, first heat exchanger; 6, first heat exchange outlet; 7, second heat exchange inlet; 8, first heat exchange inlet; 9, second temperature sensor; 10, connecting pipe; 11, third support; 12, sealing plate; 13, second heat exchanger; 14, cooling medium outlet; 15, cooling medium inlet; 16, second temperature control valve; 17, second support; 18, separation outlet; 19, gas-water separator; 20, first support; 21, drain; 22, drain valve; 23, base; 24, second heat exchange outlet; 25, separation inlet. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0027] Figures 1 to 4 The non-powered compressed air drying device shown mainly includes a first heat exchanger 5, a second heat exchanger 13, an air-water separator 19, a temperature sensor, a temperature control valve, a drain valve 22, and a connecting pipe 10. The first heat exchanger 5 is connected to the compressor outlet and receives high-temperature, high-humidity compressed air. The second heat exchanger 13 is connected to the first heat exchanger 5 and further cools the compressed air flowing in from the first heat exchanger 5 to meet the requirements of large temperature differences. The second heat exchanger 13 is connected to the air-water separator 19, transferring the secondary-cooled air to the air-water separator 19 for condensate and air separation. The air-water separator 19 is connected to the first heat exchanger 5 via the connecting pipe 10, allowing the separated compressed air to return to the first heat exchanger 5 through the connecting pipe. The device also includes auxiliary components such as a temperature sensor, a temperature control valve, and a drain valve 22 for monitoring and regulating fluid temperature, flow rate, and condensate discharge.

[0028] In some possible embodiments, the first heat exchanger 5 is an air-to-air heat exchanger, which is provided with a compressed air inlet 4, a compressed air outlet 2, a first heat exchange inlet 8, and a first heat exchange outlet 6. The compressed air inlet 4 is connected to the compressor outlet to directly receive high-temperature, high-humidity compressed air. The compressed air outlet 2 is equipped with a first temperature sensor 3 and a first temperature control valve 1 to monitor and regulate the temperature of the compressed air at the outlet, achieving precise control and ensuring the stability of the compressed air outlet temperature and pressure dew point temperature. A second temperature sensor 9 is located next to the first heat exchange inlet 8 to monitor the temperature of the cooling air entering the first heat exchanger 5. The first heat exchange outlet 6 is connected to the second heat exchanger 13, transferring the pre-cooled air to the second heat exchanger 13. The first heat exchanger 5 uses stainless steel corrugated pipes as heat exchange tubes, which not only improves heat exchange efficiency but also enhances the strength and corrosion resistance of the heat exchange tubes. Meanwhile, the compressed air inlet 4 and the compressed air outlet 2 are respectively located near both ends of the side wall of the first heat exchanger 5, and face opposite directions. The first heat exchange inlet 8 and the compressed air outlet 2 are coaxially arranged at both ends of the first heat exchanger 5, which is conducive to the uniform distribution and flow of compressed air. The pressure drop of the first heat exchanger 5 is controlled below 5 kPa, ensuring smooth airflow.

[0029] In some possible embodiments, the second heat exchanger 13 is an air-water heat exchanger, which is provided with a second heat exchange inlet 7, a second heat exchange outlet 24, a cooling medium inlet 15 and a cooling medium outlet 14. The second heat exchange inlet 7 is connected with the first heat exchange outlet 6 to receive the preliminarily cooled compressed air from the first heat exchanger 5. The second heat exchange outlet 24 is connected with the air-water separator 19 to deliver the twice-cooled air to the air-water separator 19. The cooling medium inlet 15 is provided with a second temperature control valve 16 to adjust the flow of the cooling medium.

[0030] The second heat exchanger 13 uses stainless steel sleeve aluminum sheet as the heat exchange tube element, which combines the corrosion resistance of stainless steel and the high thermal conductivity of aluminum, further improving the heat exchange efficiency. Meanwhile, the second heat exchange inlet 7 and the second heat exchange outlet 24 of the second heat exchanger 13 are respectively arranged at the positions near the two ends of the side wall of the heat exchanger, and face opposite directions. In addition, one end of the second heat exchanger 13 is mounted with an end plate 12, and the other end is provided with the cooling medium inlet 15 and the cooling medium outlet 14, which facilitates the introduction and discharge of the cooling medium. Preferably, the cooling medium inlet 15 and the cooling medium outlet 14 are connected to the cooling system of the compressor itself. The pressure drop of the second heat exchanger 13 is controlled below 2KPa, which is conducive to reducing energy consumption. It is worth mentioning that the first heat exchanger 5 and the second heat exchanger 13 can be arranged as horizontal heat exchangers, which is conducive to the uniform distribution of air and cooling medium, improves the heat exchange efficiency, and is also convenient for the installation and maintenance of the equipment.

[0031] In some possible embodiments, the air-water separator 19 is a centrifugal separator, which is internally provided with a wire mesh demisting layer to improve the separation efficiency of condensed water and air, reduce the water content in the compressed air, and also reduce the resistance loss of the entire device. The air-water separator 19 is vertically arranged, which is provided with a separation inlet 25 arranged on the side wall and a separation outlet 18 arranged at the top end. The wire mesh demisting layer is higher than the separation inlet 25. The separation inlet 25 is connected with the second heat exchange outlet 24 of the second heat exchanger 13. The separation outlet 18 is connected with the first heat exchange inlet 8 of the first heat exchanger 5 through the connecting pipe 10. The separated compressed air returns to the first heat exchanger 5 through the connecting pipe. The bottom drain 21 of the air-water separator 19 is connected with a trap 22, which is an automatic trap. The condensed water can be automatically discharged, which avoids the accumulation and corrosion of the condensed water in the device, ensures the continuous and stable operation of the separator, and prolongs the service life of the device.

[0032] In order to improve the structural stability and space utilization of the device, a base 23 is arranged below the air-water separator 19. The first support 20 supporting the air-water separator 19 is mounted on the base 23. The first heat exchanger 5 and the second heat exchanger 13 are arranged in a top-down manner. The second support 17 supporting the second heat exchanger 13 is also mounted on the base 23. The third support 11 is connected between the second heat exchanger 13 and the first heat exchanger 5 to ensure the stability and reliability of the entire device.

[0033] As Figure 4 shown, using the present unpowered compressed air drying device to dry the compressed air with an outlet temperature of 85℃ and a pressure dew point temperature of 55℃ as an example, the working process is as follows: the compressed air with an outlet temperature of 85℃ and a pressure dew point temperature of 55℃ is connected to the compressed air inlet 4 of the first heat exchanger 5, after preliminary cooling by the first heat exchanger 5, the temperature of the compressed air is reduced to 55℃ (at this time, the pressure dew point temperature is still 55℃); then, the compressed air enters the second heat exchanger 13, after secondary cooling, the temperature is reduced to 35℃ (the pressure dew point temperature is also reduced to 35℃); after that, the compressed air enters the gas-water separator 19 for separation of condensate and air; the separated compressed air enters the first heat exchanger 5 again through the connecting pipe 10 for heating, so that the temperature is raised to 65℃ (the pressure dew point temperature remains at 35℃), and finally discharged from the compressed air outlet 2. In the whole working process, by adjusting the temperature control valve, the outlet temperature of the compressed air can be controlled between 60-65℃, and the pressure dew point temperature is reduced to 30-35℃, so as to meet the requirement of the user for dry compressed air with a temperature difference of 30℃ between the use temperature and the pressure dew point temperature.

[0034] The present unpowered compressed air drying device realizes the drying process of the compressed air by twice efficient heat exchange and condensation separation, and uses the cooling system of the compressor for circulation without additional power consumption system or consumption of the energy of the compressor itself. It is suitable for the production process with a dry compressed air use temperature of 60-65℃ and a pressure dew point temperature of 30-35℃, and has obvious drying effect. The device has simple structure, convenient installation, low running and maintenance cost, and long service life. At the same time, since it replaces the after-cooler of the compressor and does not need additional power consumption system, it reduces the production cost and saves energy for the user.

Claims

1. A non-powered compressed air drying device, characterized by: The device comprises a first heat exchanger, a second heat exchanger and a gas-water separator, the first heat exchanger is provided with a compressed air inlet, a compressed air outlet, a first heat exchange inlet and a first heat exchange outlet, the compressed air inlet is connected to the air outlet of a compressor, the compressed air outlet is provided with a first temperature sensor and a first temperature control valve, the first heat exchange inlet is provided with a second temperature sensor, and the first heat exchange outlet is connected to the second heat exchanger; the second heat exchanger is provided with a second heat exchange inlet, a second heat exchange outlet, a cooling medium inlet and a cooling medium outlet, the second heat exchange inlet is connected to the first heat exchange outlet, the second heat exchange outlet is connected to the gas-water separator, and the cooling medium inlet is provided with a second temperature control valve; the gas-water separator is provided with a separation inlet and a separation outlet, the separation inlet is connected to the second heat exchange outlet, and the separation outlet is connected to the first heat exchange inlet through a connecting pipe, and a drain valve is connected to the bottom of the gas-water separator.

2. Unpowered compressed air drying device according to claim 1, characterized in that The first heat exchanger is an air-air heat exchanger.

3. Unpowered compressed air drying device according to claim 2, characterized in that: The compressed air inlet and the first heat exchange outlet are respectively arranged at positions close to two ends of the side wall of the first heat exchanger, the compressed air inlet and the first heat exchange outlet are opposite to each other in direction, and the first heat exchange inlet and the compressed air outlet are coaxially arranged at two ends of the first heat exchanger.

4. Unpowered compressed air drying apparatus according to claim 3, characterised in that: The first heat exchanger adopts a stainless steel bellows as a heat exchange pipe, and the pressure drop is controlled to be below 5KPa.

5. Unpowered compressed air drying device according to any of claims 1 to 4, characterized in that: The second heat exchanger is an air-water heat exchanger.

6. Unpowered compressed air drying device according to claim 5, characterized in that: The second heat exchange inlet and the second heat exchange outlet are respectively arranged at positions close to two ends of the side wall of the second heat exchanger, the second heat exchange inlet and the second heat exchange outlet are opposite to each other in direction, one end of the second heat exchanger is provided with a sealing plate, and the other end is provided with the cooling medium inlet and the cooling medium outlet.

7. Unpowered compressed air drying device according to claim 6, characterized in that The second heat exchanger adopts a stainless steel sleeve aluminum sheet as a heat exchange pipe element, and the pressure drop is controlled to be below 2KPa.

8. Unpowered compressed air drying device according to claim 7, characterized in that: The first heat exchanger and the second heat exchanger are both horizontal heat exchangers.

9. Unpowered compressed air drying apparatus according to claim 8, characterised in that: A base is arranged below the gas-water separator, the base is provided with a first support supporting the gas-water separator and a second support supporting the second heat exchanger, and a third support is connected between the second heat exchanger and the first heat exchanger.

10. The unpowered compressed air drying device of claim 1, wherein: The gas-water separator is a centrifugal separator, and a wire mesh demisting layer is arranged in the gas-water separator.

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