Air bath type vaporizer de-icing device

Abstract

The utility model discloses a kind of air bath type vaporizer deicing device, belong to low-temperature equipment deicing technical field.The device includes electric heating unit, sensing unit and control unit.Electric heating unit adopts low-temperature-resistant oxidation-resistant metal electric heating wire, through high-temperature-resistant insulating layer even winding in star-shaped aluminum alloy finned tube surface and root;Sensing unit includes temperature sensor monitoring finned tube surface temperature, humidity sensor monitoring ambient humidity and frost layer thickness sensor monitoring frost layer thickness;Control unit receives sensor signal by controller, when monitoring value exceeds preset temperature threshold, humidity threshold or frost layer thickness threshold, automatically start electric heating wire, and automatically adjust or cut off power when reaching heating temperature upper limit.The utility model can realize fast accurate deicing, effectively restore heat exchange efficiency, while having the advantages of energy saving and consumption reduction, safe and reliable and fully automatic operation.

Description

Technical Field

[0001] This utility model belongs to the technical field of air bath vaporizers, specifically relating to an air bath vaporizer de-icing device. Background Technology

[0002] As a core piece of equipment in the industrial gas field, the air-bath vaporizer uses star-shaped aluminum alloy finned tubes to exchange heat with the air through natural convection, vaporizing low-temperature liquids into gases. However, during operation, when the ambient air humidity is too high, moisture will condense into frost when it encounters the low-temperature finned tubes. When the surface temperature of the finned tubes is lower than the air dew point temperature, it will also lead to sublimation and frost formation. At the same time, the pressure changes caused by the air flowing through the finned tube bundle will cause temperature changes, which will inducing frost formation. These frost problems will form a heat insulation layer, which will significantly reduce the heat exchange efficiency, leading to a decrease in vaporization capacity and triggering a vicious cycle of "frost formation - reduced efficiency - lower temperature - more severe frost formation". Traditional defrosting methods, such as natural defrosting during shutdown or hot steam purging, have problems such as low efficiency, high energy consumption, cumbersome operation, and easy damage to the precision finned structure. Utility Model Content

[0003] The present invention aims to provide an air-bath type vaporizer de-icing device to solve the technical problems of low efficiency, high energy consumption and easy damage to precision fin structure of existing defrosting methods.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An air-bath type carburetor de-icing device includes: An electric heating unit, comprising an electric heating wire wound or attached to the surface of the star-shaped aluminum alloy finned tube; The sensing unit includes a temperature sensor and a humidity sensor disposed on the surface of the star-shaped aluminum alloy finned tube. The temperature sensor is used to monitor the temperature of the surface of the star-shaped aluminum alloy finned tube, and the humidity sensor is used to monitor the ambient humidity around the star-shaped aluminum alloy finned tube. A control unit, which is signal-connected to the electric heating unit and the sensing unit, is configured to control the start and stop of the electric heating wire based on the monitoring signals from the temperature sensor and the humidity sensor.

[0005] Furthermore, the control unit includes a controller, which has preset temperature and humidity thresholds. When the monitored surface temperature of the star-shaped aluminum alloy finned tube is lower than the temperature threshold, or the ambient humidity is higher than the humidity threshold, the controller automatically activates the electric heating wire.

[0006] Furthermore, the sensing unit also includes a frost thickness sensor for real-time monitoring of frost thickness, the frost thickness sensor being signal-connected to the controller; the controller also has a preset frost thickness threshold, and when the monitored frost thickness reaches the frost thickness threshold, the controller automatically activates the electric heating wire.

[0007] Furthermore, the controller has a preset upper limit value for heating temperature. When the electric heating wire is started, if the surface temperature of the star-shaped aluminum alloy finned tube detected by the temperature sensor reaches the upper limit value for heating temperature, the controller will automatically cut off or reduce the power of the electric heating wire.

[0008] Furthermore, the heating wire is a low-temperature resistant and oxidation-resistant metal heating wire.

[0009] Furthermore, a high-temperature resistant insulating layer is provided between the electric heating wire and the surface of the star-shaped aluminum alloy finned tube.

[0010] Furthermore, the electric heating wire is evenly wound around the fin surface and root of the star-shaped aluminum alloy finned tube.

[0011] Compared with the prior art, the beneficial effects of this utility model are: (1) This utility model uses an electric heating wire to directly act on the surface of the icing fins. The heat conduction path is short and the efficiency is high. It can quickly melt the frost layer within a few minutes, significantly shorten the de-icing time, and enable the vaporizer to quickly restore the best heat exchange efficiency, effectively breaking the vicious cycle of "frost formation - efficiency decline - more severe frost formation". (2) This utility model is based on real-time data fusion judgment from multiple sensors (temperature, humidity, frost thickness) to achieve precise start and stop heating on demand, avoiding the blindness of traditional periodic defrosting. Combining intermittent pulse heating and temperature upper limit protection mechanism, it only operates at the lowest required power when necessary, minimizing energy waste and achieving high operating economy; (3) The dual design of the low-temperature resistant and oxidation-resistant electric heating wire and the high-temperature resistant insulation layer of this utility model ensures electrical safety and service life under harsh working conditions of low temperature and high humidity. The flexible heating element fits perfectly into the complex star-shaped fin structure, achieving uniform heating without blocking the airflow channel, which is especially suitable for upgrading existing equipment; (4) This utility model system integrates sensing, judgment and execution functions to achieve fully automated operation without manual operation or shutdown, which reduces maintenance costs and management burden and ensures the continuity and stability of the gas supply system. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the structure of an air-bath type vaporizer de-icing device according to the present invention; Figure 2 This is a structural block diagram of an air-bath type vaporizer de-icing device according to the present invention; Figure 3 This is a flowchart illustrating the working process of an air-bath type vaporizer de-icing device according to this utility model. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] The present invention will be further described in detail below with reference to the embodiments.

[0015] like Figure 1 and Figure 2 As shown, the air-bath type vaporizer de-icing device of this utility model is mainly applied to air-bath type vaporizers with star-shaped aluminum alloy finned tubes 1 as the core heat exchange element. The de-icing device mainly consists of three parts: an electric heating unit, a sensing unit, and a control unit.

[0016] In this embodiment, the electric heating unit uses a low-temperature resistant (e.g., capable of withstanding -196℃) and oxidation-resistant nickel-chromium alloy metal heating wire 2. This heating wire 2 has excellent flexibility, allowing it to be tightly and evenly wound around the fin surface and root of the star-shaped aluminum alloy finned tube 1, ensuring that heat can be directly and evenly transferred to the areas most prone to frost. To ensure electrical safety, a high-temperature resistant insulating layer (such as a polyimide film or ceramic insulating coating) is coated or added between the heating wire 2 and the metal surface of the star-shaped aluminum alloy finned tube 1, effectively preventing the risk of leakage or short circuit.

[0017] The sensing unit includes a temperature sensor 3, a humidity sensor 4, and a frost thickness sensor 5. The temperature sensor 3 (such as a PT100 platinum resistance thermometer) is fixed to the fin surface of the star-shaped aluminum alloy finned tube 1 using thermally conductive adhesive or mechanical clips to monitor its surface temperature in real time. The humidity sensor 4 is installed near the vaporizer finned tube bundle or at the air inlet to monitor the relative humidity of the surrounding air in real time. The frost thickness sensor 5 (which can employ microwave or capacitive thickness measurement principles) is non-contactly aligned with the finned tube surface to monitor the thickness of the frost layer accumulated on the fin surface in real time.

[0018] The core of the control unit is a programmable logic controller (PLC) or a dedicated microprocessor controller. The signal outputs of temperature sensor 3, humidity sensor 4, and frost thickness sensor 5 are all connected to the input port of controller 6 via signal lines. The output port of controller 6 is connected to the heating wire 2 circuit via a solid-state relay (SSR) or a silicon controlled rectifier (SCR) to control its on / off state and power. Controller 6 has multiple preset control thresholds, including a temperature threshold, a humidity threshold, a frost thickness threshold, and an upper limit for heating temperature (e.g., +5°C to prevent overheating).

[0019] The working process of this utility model is as follows: like Figure 3 As shown, the controller 6 continuously collects data from the sensing unit. When any of the following conditions are met, the controller 6 automatically starts the electric heating wire 2 to defrost: the monitored surface temperature of the finned tube is lower than the preset temperature threshold, the monitored ambient humidity is higher than the preset humidity threshold, or the monitored frost thickness reaches or exceeds the preset frost thickness threshold.

[0020] After the electric heating wire 2 is activated, the controller 6 enters monitoring mode. Once the temperature sensor 3 detects that the surface temperature of the finned tube has reached the preset upper limit of the heating temperature, the controller 6 will immediately cut off the power or automatically reduce the heating power, entering a heat preservation or pause state until the temperature drops and then restart, repeating this cycle until the frosting conditions are resolved. This intermittent pulse heating mode can effectively defrost while maximizing energy savings and preventing energy waste.

[0021] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A de-icing device for an air-bath type vaporizer, characterized in that, include: An electric heating unit comprising an electric heating wire wound or attached to the surface of a star-shaped aluminum alloy finned tube of an air bath vaporizer; The sensing unit includes a temperature sensor and a humidity sensor disposed on the surface of the star-shaped aluminum alloy finned tube. The temperature sensor is used to monitor the temperature of the surface of the star-shaped aluminum alloy finned tube, and the humidity sensor is used to monitor the ambient humidity around the star-shaped aluminum alloy finned tube. A control unit, which is signal-connected to the electric heating unit and the sensing unit, is configured to control the start and stop of the electric heating wire based on the monitoring signals from the temperature sensor and the humidity sensor.

2. The de-icing device for an air-bath type vaporizer according to claim 1, characterized in that: The control unit includes a controller, which has preset temperature and humidity thresholds. When the monitored surface temperature of the star-shaped aluminum alloy finned tube is lower than the temperature threshold or the ambient humidity is higher than the humidity threshold, the controller automatically activates the electric heating wire.

3. The de-icing device for an air-bath type vaporizer according to claim 2, characterized in that: The sensing unit also includes a frost thickness sensor for real-time monitoring of frost thickness, which is connected to the controller. The controller also has a preset frost thickness threshold. When the detected frost thickness reaches the frost thickness threshold, the controller automatically activates the electric heating wire.

4. The de-icing device for an air-bath type vaporizer according to claim 3, characterized in that: The controller has a preset upper limit for heating temperature. When the electric heating wire is started, if the surface temperature of the star-shaped aluminum alloy finned tube detected by the temperature sensor reaches the upper limit for heating temperature, the controller will automatically cut off or reduce the power of the electric heating wire.

5. The de-icing device for an air-bath type vaporizer according to claim 1, characterized in that: The heating wire is a low-temperature resistant and oxidation-resistant metal heating wire.

6. The de-icing device for an air-bath type vaporizer according to claim 1, characterized in that: A high-temperature resistant insulating layer is provided between the electric heating wire and the surface of the star-shaped aluminum alloy finned tube.

7. The de-icing device for an air-bath type vaporizer according to claim 1, characterized in that: The electric heating wire is evenly wound around the fin surface and root of the star-shaped aluminum alloy finned tube.

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