Temperature control type compressed gas drying device

Abstract

The utility model discloses a temperature control type compressed gas drying device which comprises a refrigerating system, a drying system and a control system. The refrigerating system comprises a compressor, a condenser, a refrigerant thermostatic expansion valve and a refrigerant evaporator which are connected in sequence; the drying system comprises a gas-gas heat exchanger, a gas-gas distribution valve, a gas inlet temperature sensor and a gas outlet temperature sensor, compressed gas sequentially enters the gas-gas heat exchanger and the refrigerant evaporator through pipelines, the gas-gas distribution valve is located on the pipeline after the compressed gas flows out of the refrigerant evaporator, and the number of outlet pipelines of the gas-gas distribution valve is two. Wherein one gas inlet pipe enters the gas-gas heat exchanger, and the other gas inlet pipe is connected with the previous gas inlet pipe in parallel and is gathered behind the gas-gas heat exchanger; the inlet air temperature sensor is located on a pipeline before compressed air enters the air-air heat exchanger, and the exhaust air temperature sensor is located on a gathering pipeline behind the air-air heat exchanger. The device can stably output compressed gas according to the actual required temperature in different seasons, the use energy consumption is reduced, and the ice blockage phenomenon is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of compressed gas application, specifically relates to a temperature control type compressed gas drying device. BACKGROUND

[0002] The application of compressed gas in industry is very extensive, and liquid water usually appears in the gas compression process, and the liquid water will bring many adverse factors to the subsequent use of compressed gas, for example, corrosion, pollution, and influence on the working condition of subsequent processes, therefore, drying is an indispensable process for treating the compressed gas, and in most areas, the refrigeration type drying can meet the use scene with low dew point requirement.

[0003] The standard refrigeration type drying process usually increases the pressure and enthalpy of the refrigerant on the refrigerant side through the fixed frequency compressor; then the refrigerant enters the condenser to reduce the enthalpy, and the pressure is almost unchanged; then the pressure is reduced through the thermal expansion valve; then the refrigerant enters the evaporator to exchange heat with the compressed gas, and the enthalpy of the refrigerant is increased. In addition, the compressed gas is first exchanged heat with the compressed gas after the evaporator in the gas-gas heat exchanger, so that the newly entered compressed gas is pre-cooled, and then enters the evaporator to reduce the temperature, and the water in the compressed gas is separated out through the subsequent gas-liquid separation, thereby achieving the purpose of reducing the dew point of the compressed gas.

[0004] However, in the actual application of the current backend, the compressed gas temperature needs to be relatively low, which is beneficial to the energy saving and process performance improvement of the backend main process. At the same time, due to the different use regions and temperature changes in different seasons, the temperature of the final compressed gas fluctuates greatly. In summer, in order to obtain compressed gas with lower temperature, a special cooling device is set up in some occasions, which causes the lengthening of the process route, the increase of the equipment and the increase of the fault points, and multiple heat exchanges are actually a waste of energy. In winter, due to the low temperature, the device has no large adjustment capacity, which leads to the low temperature of the compressed gas, the waste of energy, and the easy occurrence of ice blockage. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above-mentioned defects of using the standard refrigeration type drying process to treat the compressed gas, and provides a temperature control type compressed gas drying device, which can meet the actual demand temperature stable output of the compressed gas in different seasons, and can reduce the energy consumption.

[0006] The utility model realizes the following technical scheme:

[0007] The utility model provides a kind of compressed gas drying device of temperature control type, including refrigeration system, drying system and control system;The refrigeration system includes compressor, condenser, refrigerant thermal expansion valve and refrigerant evaporator connected in sequence;The drying system includes gas-gas heat exchanger, gas-gas distribution valve, inlet air temperature sensor and exhaust temperature sensor, compressed gas enters gas-gas heat exchanger and refrigerant evaporator in sequence by pipeline, the gas-gas distribution valve is located on the pipeline after compressed gas flows out refrigerant evaporator, the outlet pipeline of the gas-gas distribution valve has two, one enters gas-gas heat exchanger, another is parallel with the former and is gathered after gas-gas heat exchanger;The inlet air temperature sensor is located on the pipeline before compressed gas enters gas-gas heat exchanger, and the exhaust temperature sensor is located on the pipeline after compressed gas flows out gas-gas heat exchanger and is gathered;The control system is electrically connected with the gas-gas distribution valve, inlet air temperature sensor and exhaust temperature sensor.

[0008] As a preferred scheme of the utility model, the compressor is a variable frequency compressor, which is adjusted in frequency according to the refrigerant load change.

[0009] As a preferred scheme of the utility model, the refrigeration system further includes a liquid collector, which is located between the condenser and the refrigerant thermal expansion valve.

[0010] As a preferred scheme of the utility model, the refrigeration system further includes a refrigerant water removal filter, which is located between the liquid collector and the refrigerant thermal expansion valve.

[0011] As a preferred scheme of the utility model, the refrigeration system further includes a refrigerant gas-liquid separator, which is located between the refrigerant evaporator outlet and the compressor inlet.

[0012] As a preferred scheme of the utility model, the refrigeration system further includes a refrigerant high-low pressure combination switch, which is connected between the compressor inlet and outlet, and is electrically connected with the control system.

[0013] As a preferred scheme of the utility model, the refrigeration system further includes a compressor exhaust temperature sensor, which is located at the compressor outlet.

[0014] As a preferred scheme of the utility model, the refrigeration system further includes a compressor inlet temperature sensor, which is located at the compressor inlet.

[0015] As a preferred scheme of the utility model, the compressor exhaust temperature sensor and the compressor inlet temperature sensor are both electrically connected with the control system.

[0016] As the preferred scheme of the utility model, the target value of the compressed gas intake temperature and exhaust temperature is preset in the control system, and compared with the detection value of the intake temperature sensor and exhaust temperature sensor, the internal state of the valve is adjusted through the comparison result, and the control of the temperature is realized.

[0017] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0018] The utility model discloses a gas distribution valve, intake temperature sensor and exhaust temperature sensor are set, utilize intake temperature sensor and exhaust temperature sensor detection compressed gas intake and exhaust temperature when working, and compare with the target value of control system, and the internal state of the valve is adjusted through the comparison result, and the control of the compressed gas temperature is realized, the device can guarantee the stable output temperature relatively constant low temperature compressed gas, and the use of frequency conversion compressor can adjust the load when the temperature is low in winter, and it is favorable for reducing the energy consumption and preventing the emergence of ice block phenomenon. DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the utility model, the following will briefly introduce the drawing needed to be used in the embodiment, and should understand, the following drawing only shows some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0020] Figure 1 The temperature control type compressed gas drying device principle diagram in the utility model.

[0021] Mark and corresponding component name in the drawing:

[0022] 1-compressor, 2-condenser, 3-liquid collector, 4-refrigerant water filter, 5-refrigerant gas-liquid separator, 6-refrigerant thermal expansion valve, 7-refrigerant high-low pressure combination switch, 8-compressor exhaust temperature sensor, 9-compressor inlet temperature sensor, 10-gas-gas heat exchanger, 11-refrigerant evaporator, 12-gas distribution valve, 13-intake temperature sensor, 14-exhaust temperature sensor, 15-control system. Specific implementation

[0023] In order to make the purpose, technical scheme and advantages of the utility model clearer and more understandable, the utility model will be further described in detail below in combination with embodiments and drawings. The schematic embodiments of the utility model and the description thereof are only used to explain the utility model and do not serve as the limitation of the utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. The description herein and the claims that follow use the terminology "including" and "comprising" and variations thereof to mean that the specified features are included and not to exclude or to preclude any additional or other features.

[0025] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0026] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment that is separate or alternative to other embodiments. It is explicitly and implicitly understood that the embodiments described herein can be combined with each other.

[0027] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing, A and B existing, and B existing. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0028] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0029] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces), unless otherwise explicitly specified.

[0030] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0031] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0032] Please refer to Figure 1 The temperature-controlled compressed gas drying device provided in the embodiments of the present application includes a refrigeration system, a drying system and a control system 15; the refrigeration system includes a compressor 1, a condenser 2, a refrigerant thermal expansion valve 6 and a refrigerant evaporator 11 connected in sequence; the drying system includes a gas-gas heat exchanger 10, a gas-gas distribution valve 12, an inlet gas temperature sensor 13 and an outlet gas temperature sensor 14; compressed gas enters the gas-gas heat exchanger 10 and the refrigerant evaporator 11 in sequence through a pipeline; the gas-gas distribution valve 12 is located on the pipeline after the compressed gas flows out of the refrigerant evaporator 11; the outlet pipeline of the gas-gas distribution valve 12 has two pipelines, one of which enters the gas-gas heat exchanger 10, and the other is parallel to the former and is collected after the gas-gas heat exchanger 10; the inlet gas temperature sensor 13 is located on the pipeline before the compressed gas enters the gas-gas heat exchanger 10; the outlet gas temperature sensor 14 is located on the pipeline after the compressed gas is collected after flowing out of the gas-gas heat exchanger 10; the control system 15 is electrically connected with the gas-gas distribution valve 12, the inlet gas temperature sensor 13 and the outlet gas temperature sensor 14.

[0033] In this embodiment, the gas-gas distribution valve 12, the intake gas temperature sensor 13 and the exhaust gas temperature sensor 14 are arranged. During operation, the intake gas temperature sensor 13 and the exhaust gas temperature sensor 14 are used to detect the temperature of the compressed gas intake and exhaust, and the detected temperature is compared with the target value preset in the control system 15. According to the comparison result, the control system 15 outputs a signal to the gas-gas distribution valve 12, so as to change the amount of compressed gas entering the gas-gas heat exchanger 10. Since the gas can pre-cool the newly entering compressed gas, the temperature of the compressed gas can be controlled, and the stable output temperature of the low-temperature compressed gas is ensured.

[0034] According to some embodiments of the present application, the compressor 1 is a variable frequency compressor, which is adjusted in frequency according to the refrigerant load, and is suitable for different working conditions and different seasons, and stabilizes the working condition. Through the use of the variable frequency compressor, the load can be adjusted when the temperature is low in winter, which is beneficial to reduce the energy consumption.

[0035] According to some embodiments of the present application, the refrigeration system further comprises a liquid collector 3, which is located between the condenser 2 and the refrigerant thermal expansion valve 6. Since the temperature of the refrigerant is reduced after passing through the condenser 2, part of the refrigerant is condensed into liquid refrigerant, which can be collected by the liquid collector 3.

[0036] According to some embodiments of the present application, the refrigeration system further comprises a refrigerant water removal filter 4, which is located between the liquid collector 3 and the refrigerant thermal expansion valve 6. By arranging the refrigerant water removal filter 4, the water in the refrigerant can be effectively removed, so as to ensure the refrigeration effect.

[0037] According to some embodiments of the present application, the refrigeration system further comprises a refrigerant gas-liquid separator 5, which is located between the outlet of the refrigerant evaporator 11 and the inlet of the compressor 1. Since the refrigerant is in a gas-liquid mixed state after passing through the refrigerant evaporator 11, the liquid refrigerant can be separated out by arranging the refrigerant gas-liquid separator 5 before the inlet of the compressor 1.

[0038] According to some embodiments of the present application, the refrigeration system further comprises a refrigerant high-low pressure combination switch 7, which is connected between the inlet and the outlet of the compressor 1, and is electrically connected with the control system 15. The refrigerant high-low pressure combination switch 7 monitors the refrigerant pressure in the refrigeration system in real time through the internal pressure sensor. When the pressure is too high or too low, the switch will automatically cut off the power, so as to protect the compressor and the refrigeration system from damage.

[0039] Specifically, when the refrigerant pressure in the refrigeration system exceeds the set high pressure limit, the high pressure switch will trigger, cutting off the power supply to prevent equipment failure caused by excessive pressure; when the refrigerant pressure is lower than the set low pressure limit, the low pressure switch will act, cutting off the power supply to avoid poor lubrication or compressor damage caused by low pressure.

[0040] According to some embodiments of the application, the refrigeration system further comprises a compressor discharge temperature sensor 8 located at the outlet end of the compressor 1.

[0041] According to some embodiments of the application, the refrigeration system further comprises a compressor inlet temperature sensor 9 located at the inlet end of the compressor 1.

[0042] According to some embodiments of the application, the compressor discharge temperature sensor 8 and the compressor inlet temperature sensor 9 are electrically connected to the control system 15. Through the compressor discharge temperature sensor 8 and the compressor inlet temperature sensor 9, the temperature of the refrigerant can be detected in real time, and when the temperature is too high or too low, the control system 15 can make appropriate response according to the specific situation, so as to protect the compressor and the refrigeration system from damage.

[0043] According to some embodiments of the application, the control system is preset with target values of the inlet temperature and the discharge temperature of the compressed gas, and the detected values of the inlet temperature sensor 13 and the discharge temperature sensor 14 are compared, and the control system outputs signals to the gas-gas distribution valve 12 according to the comparison results, so as to adjust the internal state of the valve and realize temperature control.

[0044] According to the comparison of the detected temperature of the inlet temperature sensor 13 with the target value set in the control system 15, and the comparison of the detected temperature of the discharge temperature sensor 14 with the target value set in the control system 15, the control system outputs signals to the gas-gas distribution valve 12 according to the comparison results, so as to adjust the opening degree of the valve in different directions, thereby changing the amount of compressed gas entering the gas-gas heat exchanger 10, and further changing the pre-cooling effect of the compressed gas.

[0045] The compressed gas drying device in this embodiment can solve the problem of low temperature demand for purified compressed gas, and also realize load adjustment due to seasonal changes. It can meet the requirements of compressed gas drying and low exhaust temperature, provide stable low temperature gas supply for the downstream process in different seasons, avoid the situation that the temperature of purified gas in the conventional mode is different due to different seasons, and the cooling equipment needs to be added again in the downstream, and can meet the requirements of low temperature gas supply in different seasons and avoid energy waste, which has excellent practicality and popularization and application value.

[0046] The above specific embodiments explain the purpose, technical scheme and beneficial effects of the present application in further detail, and it should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A temperature-controlled compressed gas drying device, characterized by, The refrigeration system comprises a compressor, a condenser, a refrigerant thermal expansion valve and a refrigerant evaporator connected in sequence; the drying system comprises a gas-gas heat exchanger, a gas-gas distribution valve, an inlet gas temperature sensor and an outlet gas temperature sensor; the compressed gas enters the gas-gas heat exchanger and the refrigerant evaporator in sequence through a pipeline; the gas-gas distribution valve is arranged on the pipeline after the compressed gas flows out of the refrigerant evaporator; the outlet pipeline of the gas-gas distribution valve has two branches, one of which enters the gas-gas heat exchanger, and the other is parallel to the first branch and is combined after the gas-gas heat exchanger; the inlet gas temperature sensor is arranged on the pipeline before the compressed gas enters the gas-gas heat exchanger; the outlet gas temperature sensor is arranged on the pipeline after the compressed gas is combined after flowing out of the gas-gas heat exchanger; and the control system is electrically connected with the gas-gas distribution valve, the inlet gas temperature sensor and the outlet gas temperature sensor.

2. The temperature-controlled compressed gas drying device according to claim 1, wherein The compressor is a variable frequency compressor, which is adjusted in frequency according to the refrigerant load change.

3. The temperature-controlled compressed gas drying device according to claim 1, wherein The refrigeration system further comprises a liquid collector arranged between the condenser and the refrigerant thermal expansion valve.

4. The temperature-controlled compressed gas drying device according to claim 3, wherein The refrigeration system further comprises a refrigerant water removal filter arranged between the liquid collector and the refrigerant thermal expansion valve.

5. The temperature-controlled compressed gas drying device according to claim 4, wherein The refrigeration system further comprises a refrigerant gas-liquid separator arranged between the refrigerant evaporator outlet and the compressor inlet.

6. The temperature-controlled compressed gas drying device according to claim 1, wherein The refrigeration system further comprises a refrigerant high-low pressure combination switch connected between the compressor inlet and outlet, which is electrically connected with the control system.

7. The temperature-controlled compressed gas drying device according to claim 6, wherein The refrigeration system further comprises a compressor outlet temperature sensor arranged at the compressor outlet.

8. The temperature-controlled compressed gas drying device according to claim 7, wherein The refrigeration system further comprises a compressor inlet temperature sensor arranged at the compressor inlet.

9. The temperature-controlled compressed gas drying device according to claim 8, wherein The compressor outlet temperature sensor and the compressor inlet temperature sensor are electrically connected with the control system.

10. The temperature-controlled compressed gas drying device according to claim 1, wherein The control system is preset with target values of the inlet and outlet gas temperatures of the compressed gas, and compares the detection values of the inlet and outlet gas temperature sensors with the target values; the control system outputs signals to the gas-gas distribution valve to adjust the internal state of the valve and control the temperature according to the comparison results.

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