A vaporizer for gasification and cold energy utilization

Abstract

This utility model provides a vaporizer for utilizing vaporization cold energy, comprising a liquefied gas flow pipe and an air flow pipe; the liquefied gas flow pipe includes multiple finned heat transfer tubes and an outlet flange; the multiple finned heat transfer tubes are connected to each other via finned connecting pipes; the outlet flange is connected to the output end of the liquefied gas flow pipe; the air flow pipe includes a sleeve and an air connecting pipe; the sleeve is coaxially fitted around the outside of each finned heat transfer tube; the ends of two adjacent sleeves are connected via an air connecting pipe; an air compressor is connected at the inlet of the air flow pipe, and an air duct is connected at its outlet, with a fan installed inside; thereby, this application utilizes the fan at the outlet of the sleeve to discharge the air inside the sleeve into the factory building, and after heat exchange in the vaporizer, the fan blows the air into the workshop, providing cold air to the workshop; thus, the operation of utilizing the vaporizer's cold energy is completed.

Description

Technical Field

[0001] This utility model relates to the field of vaporizer technology, and in particular to a vaporizer for utilizing cold energy through vaporization. Background Technology

[0002] Industrial gases are widely used in manufacturing. Many factories first purchase liquid industrial gases, then convert them into gaseous gases using vaporizers, and finally reduce the pressure using pressure-reducing valves before use. Currently, air-bath vaporizers are commonly used in industry for liquid nitrogen and liquid oxygen. These vaporizers use naturally convection air from the atmosphere as a heat source, and then exchange heat with the cryogenic liquid through aluminum finned tubes, causing it to vaporize into a gas at a certain temperature.

[0003] At this time, the liquid industrial gas transported inside the finned tube is at a temperature of over -100 degrees Celsius. It exchanges heat with the outside air through the finned tube. As the liquid industrial gas gradually exchanges heat, it absorbs heat and vaporizes, while the outside air releases heat and cools down. However, the outside air, which has already been cooled down, can only diffuse in the air, resulting in a waste of cold energy.

[0004] Currently, there are still technical obstacles to the utilization of cold energy in vaporizers: after a period of operation, existing finned tubes will condense on the outside of the finned tubes as frost, forming a frost layer, due to the heat released by water vapor in the outside air. At this time, the efficiency of heat exchange between the inside and outside of the finned tubes is greatly reduced due to the obstruction of the frost layer, which in turn reduces the heat released by the outside air, and the effect of utilizing cold energy cannot reach the expected level. Utility Model Content

[0005] The technical problem this invention aims to solve is to address the shortcomings of the existing technology by providing a vaporizer for utilizing vaporization cold energy. A fan installed at the outlet of the casing is used to discharge air from the casing into the factory building. Furthermore, after heat exchange in the vaporizer, the air enters the workshop under the blowing of the fan, providing cool air to the workshop; thereby, this application achieves the function of utilizing the cold energy of the vaporizer.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A vaporizer for utilizing cold energy through vaporization includes a liquefied gas flow pipe and an air flow pipe; the liquefied gas flow pipe includes multiple finned heat transfer tubes and an outlet flange; the multiple finned heat transfer tubes are connected to each other via finned connecting pipes; the outlet flange is connected to the output end of the liquefied gas flow pipe.

[0008] The air circulation duct includes a sleeve and an air connection pipe; the sleeve is coaxially fitted around the outside of each finned heat transfer tube; the ends of two adjacent sleeves are connected by an air connection pipe; an air compressor is connected to the inlet of the air circulation duct, and an air duct is connected to its outlet, with a fan installed inside; a blockage detection component is provided at the air duct and the outlet flange, which is used to detect whether there is severe frost inside the sleeve near the input end of the liquefied gas circulation duct;

[0009] Furthermore, the first finned heat transfer tube and the second finned heat transfer tube, which are close to the inlet end of the liquefied gas flow pipe, are connected in parallel to the inlet end of the liquefied gas flow pipe via a tee pipe, and their ends are connected to form a U-shaped structure via a finned connecting pipe; wherein, a valve control component is provided at the connection point of the first finned heat transfer tube and the second finned heat transfer tube connected in parallel, which is used for the alternating use of the first finned heat transfer tube and the second finned heat transfer tube.

[0010] The valve control assembly includes a first valve, a second valve, a third valve, and a fourth valve; the first valve is located at the connection between the tee pipe and the first finned heat transfer pipe, the second valve is located at the connection between the tee pipe and the second finned heat transfer pipe, the third valve is located at the connection between the first finned heat transfer pipe and the finned connecting pipe, and the fourth valve is located at the connection between the second finned heat transfer pipe and the finned connecting pipe.

[0011] The blockage detection component includes a temperature sensor and a flow sensor. The temperature sensor is located at the outlet flange and is used to detect the temperature of the gas discharged from the liquefied gas circulation pipe after heat exchange. The flow sensor is located at the connection between the air duct and the air circulation pipe and is used to detect the air volume of the air circulation pipe.

[0012] The multiple finned heat transfer tubes are connected by finned connecting tubes and are distributed in a serpentine pattern.

[0013] The finned connecting pipe and the air connecting pipe are symmetrically arranged along the middle of the finned heat transfer pipe, so that the flow direction of the liquefied gas in the liquefied gas flow pipe is opposite to the flow direction of the air in the sleeve.

[0014] The bottom of the sleeve has a small hole, and a removable sealing plug is installed inside the small hole.

[0015] A resistance wire heater is installed at the inlet of the air circulation duct.

[0016] The microcontroller has an A / D converter and a D / A converter connected to its signal input and signal output terminals, respectively. The temperature sensor and flow sensor are electrically connected to the A / D converter, and the first valve, second valve, third valve, fourth valve, and resistance wire heater are electrically connected to the D / A converter. A timer for timing the working time of the resistance wire heater is electrically connected to the microcontroller.

[0017] This utility model has the following beneficial effects:

[0018] First, the vaporizer for utilizing cold energy through vaporization provided by this utility model utilizes an air circulation duct fitted outside the finned heat transfer tubes. An air compressor introduces external air into the air circulation duct, and a fan installed at the outlet of the duct creates a stable airflow. The air flowing through the finned heat transfer tubes exchanges heat with the liquid gas inside the finned heat transfer tubes. As the fan operates, the cooled air is introduced into the production workshop through the duct for cooling. Thus, this application achieves the function of utilizing cold energy through vaporization.

[0019] Secondly, the vaporizer for utilizing cold energy through vaporization provided by this utility model utilizes a first finned heat transfer tube and a second finned heat transfer tube connected in parallel. When either of them is severely frosted, a valve control component can be used to control the non-frosted finned heat transfer tube to transport liquefied gas. After the severely frosted finned heat transfer tube defrosts, the valve control component can switch between the finned heat transfer tube that is currently transporting gas and the non-transporting finned heat transfer tube. At this time, this application can control the finned heat transfer tube that has never had a thick frost layer to exchange heat with the outside air. In this way, this utility model can effectively solve the problem of poor cold energy utilization effect of vaporizers.

[0020] Third, the vaporizer for utilizing cold energy vaporization provided by this utility model can also use hot air to melt the frost crystals when the fins are frosted; at the same time, when the resistance wire heating tube section stops heating, the external air introduced by the air compressor will flow through the fins, accelerating the heat exchange rate of the liquefied gas in the fin heat transfer tube, thereby improving the working efficiency of the vaporizer. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of the vaporizer for reducing frost provided by this utility model;

[0022] Figure 2 This is a schematic diagram of a vaporizer system for reducing frost formation provided by this utility model.

[0023] In the picture:

[0024] 1. Finned heat transfer tube; 2. Finned connecting tube; 3. Sleeve; 4. Air connecting tube; 5. Air compressor; 6. Resistance wire heater; 7. Air duct; 8. Fan; 9. First valve; 10. Second valve; 11. Third valve; 12. Fourth valve; 13. T-connector; 14. Outlet flange; 15. Temperature sensor; 16. Flow sensor. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

[0026] In the description of this utility model, it should be understood that the terms "left side," "right side," "upper part," "lower part," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. "First," "second," etc., do not indicate the importance of the components, and therefore should not be construed as a limitation of this utility model. The specific dimensions used in this embodiment are only for illustrating the technical solution and do not limit the protection scope of this utility model.

[0027] Reference Figure 1 This application provides a vaporizer for utilizing cold energy through vaporization, comprising a liquefied gas (LPG) flow pipe and an air flow pipe. The LPG flow pipe includes multiple finned heat transfer tubes 1 and an outlet flange 14. The multiple finned heat transfer tubes 1 are connected by finned connecting pipes 2, and the multiple finned heat transfer tubes 1 are connected by finned connecting pipes 2 in a serpentine distribution. The outlet flange 14 is connected to the output end of the LPG flow pipe. The air flow pipe includes sleeves 3 and air connecting pipes 4. Each finned heat transfer tube 1 is coaxially fitted with a sleeve 3. The ends of two adjacent sleeves 3 are connected by an air connecting pipe 4. An air compressor 5 is connected to the inlet of the air flow pipe. Furthermore, its outlet is connected to a duct 7, which contains a fan 8; a blockage detection component is installed at the duct 7 and the outlet flange 14, which is used to detect whether the inside of the sleeve 3 near the inlet end of the liquefied gas flow pipeline is severely frosted; and the first finned heat transfer tube 1 and the second finned heat transfer tube 1 near the inlet end of the liquefied gas flow pipeline are connected in parallel to the inlet end of the liquefied gas flow pipeline through a tee pipe 13, and their ends are connected in a U-shape structure through a finned connecting pipe 2; a valve control component is installed at the connection between the first finned heat transfer tube 1 and the second finned heat transfer tube 1 connected in parallel, which is used for the alternating use of the first finned heat transfer tube 1 and the second finned heat transfer tube 1.

[0028] Reference Figure 1A fan 8 installed at the outlet of the sleeve 3 is used to discharge the air inside the sleeve 3 into the factory building. Then, after heat exchange in the vaporizer, the air enters the workshop under the blowing of the fan 8, providing cool air to the workshop; thereby, this application utilizes the cooling energy of the vaporizer; simultaneously, as the air flows through the fins, the flowing air removes the air with a lower surface temperature from the fins, further maintaining the temperature difference between the liquid industrial gas inside the finned heat transfer tube 1 and the outside, accelerating the heat exchange rate of the liquid industrial gas inside the finned heat transfer tube 1, and improving the working efficiency of the vaporizer.

[0029] Meanwhile, when the fins of the finned tube at the inlet of this application are severely frosted, thus preventing the fins from successfully completing the heat exchange between air and liquid industrial gas, this application can utilize the first and second finned heat transfer tubes connected in parallel. Through a valve control component, the finned heat transfer tube 1 that is not frosted can be controlled to transfer liquefied gas. After the severely frosted finned heat transfer tube 1 defrosts, the valve control component can be used to switch the finned heat transfer tube 1 that is transferring gas from the non-transferring finned heat transfer tube 1. In this way, this utility model can effectively solve the problem of fins being unable to exchange heat smoothly due to frost.

[0030] The valve control assembly includes a first valve 9, a second valve 10, a third valve 11, and a fourth valve 12. The first valve 9 is located at the connection between the three-way pipe 13 and the first finned heat transfer pipe 1, the second valve 10 is located at the connection between the three-way pipe 13 and the second finned heat transfer pipe 1, the third valve 11 is located at the connection between the first finned heat transfer pipe 1 and the finned connecting pipe 2, and the fourth valve 12 is located at the connection between the second finned heat transfer pipe 1 and the finned connecting pipe 2.

[0031] The blockage detection component includes a temperature sensor 15 and a flow sensor 16. The temperature sensor 15 is located at the outlet flange 14 and is used to detect the temperature of the gas discharged from the liquefied gas flow pipe after heat exchange, thereby determining whether the surface of the heat transfer finned tube at the head is severely frosted to the point of affecting the heat exchange of the liquid gas. The flow sensor 16 is located at the connection between the air duct and the air flow pipe and is used to detect the air volume of the air flow pipe, thereby determining whether the surface of the heat transfer finned tube at the head is severely frosted to the point of blocking the sleeve 3.

[0032] The finned connecting pipe 2 and the air connecting pipe 4 are symmetrically arranged along the middle of the finned heat transfer pipe 1 to make the flow direction of liquefied gas in the liquefied gas flow pipe opposite to the flow direction of air in the sleeve 3, thereby accelerating the heat exchange effect of the vaporizer.

[0033] The bottom of the sleeve 3 has a small hole with a removable sealing plug inside. This application allows the sealing plug to be opened periodically to vent and drain the liquid inside the sleeve 33.

[0034] A resistance wire heater 6 is installed at the inlet of the air circulation duct, so that when the fins inside this application are frosted, the resistance wire heating tube can be turned on to melt the frost crystals with hot air.

[0035] The circuit diagram involved in this application is as follows: Figure 2 As shown, the device of this application is also equipped with a microcontroller, whose signal input terminal and signal output terminal are respectively connected to an A / D converter and a D / A converter; the temperature sensor 15 and the flow sensor 16 are electrically connected to the A / D converter, and the first valve 9, the second valve 10, the third valve 11, the fourth valve 12 and the resistance wire heater 6 are electrically connected to the D / A converter; wherein, the timer used to time the working time of the resistance wire heater 6 is electrically connected to the microcontroller.

[0036] Working principle of cold energy utilization device:

[0037] First, liquefied industrial gas enters the liquefied gas circulation pipeline through the inlet.

[0038] Next, the air compressor 5 operates, introducing external air into the casing 3, where it exchanges heat with the liquid industrial gas through the finned heat transfer tube 1.

[0039] Next, the fan 8 operates to send the air that has completed heat exchange inside the sleeve 3 into the air duct 7.

[0040] Finally, the fan turns on, drawing the cooled air into the workshop through duct 7.

[0041] Defrosting principle of cold energy utilization devices:

[0042] First, liquefied industrial gas enters the three-way pipe 13 through the inlet. At this time, the second valve 10 and the fourth valve 12 are closed, and the first valve 9 and the third valve 11 are opened. Then, under the action of the valve control components, the liquefied gas first flows into the first finned heat transfer tube 1, then flows through the finned connecting pipe 2 through the third and subsequent finned tubes, and finally is discharged into the gas storage tank through the outlet flange 14 and the pressure reducing valve.

[0043] Simultaneously, under the action of the air compressor 5, air enters the interior of the sleeve 3 through the air connection pipe 4, and then sequentially enters the interior of subsequent sleeves 3. As the air flows, it passes through the finned heat transfer tube 1, and the heat exchange rate of the vaporizer is accelerated under the action of the air flow.

[0044] Next, after the vaporizer has been working for a period of time, when the flow sensor 16 detects a decrease in the flow rate in the sleeve 3 or the temperature sensor 15 detects that the industrial gas in the finned heat transfer tube 1 has not reached the preset temperature range, the second valve 10 and the fourth valve 12 open, correspondingly closing the first valve 9 and the third valve 11, so that the liquefied gas first flows into the second finned heat transfer tube 1, and then flows through the finned connecting pipe 2 through the third and subsequent finned tubes in sequence.

[0045] Simultaneously, when switching between the first and second finned heat transfer tubes 1, according to a preset program, the resistance wire heater 6 is energized for 10-20 seconds, raising the temperature of the air blown in by the air compressor 5. At this time, under the action of the high-temperature gas, the frost crystals on the fin surface melt. Then, by opening the bottom of the sleeve 3, the liquid inside the sleeve 3 is drained, and then the vaporizer is started again.

[0046] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A vaporizer for utilizing cold energy through vaporization, comprising a liquefied gas flow pipe and an air flow pipe; the liquefied gas flow pipe comprising a plurality of finned heat transfer tubes (1) and an outlet flange (14); the plurality of finned heat transfer tubes (1) are connected to each other via finned connecting pipes (2); the outlet flange (14) is connected to the output end of the liquefied gas flow pipe; characterized in that, The air circulation duct includes a sleeve (3) and an air connection pipe (4); the sleeve (3) is coaxially fitted on the outside of the finned heat transfer tube (1); the ends of two adjacent sleeves (3) are connected by the air connection pipe (4); an air compressor (5) is connected at the inlet of the air circulation duct, and an air duct (7) is connected at its outlet, in which a fan (8) is installed; a blockage detection component is provided at the air duct (7) and the outlet flange (14), which is used to detect whether the inside of the sleeve (3) near the input end of the liquefied gas circulation duct is severely frosted; Furthermore, the first finned heat transfer tube (1) and the second finned heat transfer tube (1) near the input end of the liquefied gas flow pipe are connected in parallel to the input end of the liquefied gas flow pipe through a three-way pipe (13), and their ends are connected in a U-shape structure through a finned connecting pipe (2); wherein, a valve control assembly is provided at the connection point of the first finned heat transfer tube (1) and the second finned heat transfer tube (1) connected in parallel, which is used for the alternating use of the first finned heat transfer tube (1) and the second finned heat transfer tube (1).

2. A vaporizer for utilizing cold energy through gasification according to claim 1, characterized in that, The valve control assembly includes a first valve (9), a second valve (10), a third valve (11), and a fourth valve (12); the first valve (9) is located at the connection between the three-way pipe (13) and the first finned heat transfer pipe (1), the second valve (10) is located at the connection between the three-way pipe (13) and the second finned heat transfer pipe (1), the third valve (11) is located at the connection between the first finned heat transfer pipe (1) and the finned connecting pipe (2), and the fourth valve (12) is located at the connection between the second finned heat transfer pipe (1) and the finned connecting pipe (2).

3. A vaporizer for utilizing cold energy through gasification according to claim 2, characterized in that, The blockage detection component includes a temperature sensor (15) and a flow sensor (16). The temperature sensor (15) is located at the outlet flange (14) and is used to detect the temperature of the gas discharged from the liquefied gas flow pipe after heat exchange. The flow sensor (16) is located at the connection between the air duct and the air flow pipe and is used to detect the air volume of the air flow pipe.

4. A vaporizer for utilizing cold energy through gasification according to claim 1, characterized in that, The multiple finned heat transfer tubes (1) are connected by finned connecting tubes (2) and are distributed in a serpentine pattern.

5. A vaporizer for utilizing cold energy through gasification according to claim 4, characterized in that, The finned connecting pipe (2) and the air connecting pipe (4) are symmetrically arranged along the middle of the finned heat transfer pipe (1) to make the flow direction of liquefied gas in the liquefied gas flow pipe opposite to the flow direction of air in the sleeve (3).

6. A vaporizer for utilizing cold energy through gasification according to claim 1, characterized in that, The sleeve (3) has a small hole at the bottom, and a removable sealing plug is provided in the small hole.

7. A vaporizer for utilizing cold energy through gasification according to claim 3, characterized in that, A resistance wire heater (6) is installed at the inlet of the air circulation duct.

8. A vaporizer for utilizing cold energy through gasification according to claim 7, characterized in that, Also includes: The microcontroller has an A / D converter and a D / A converter connected to its signal input and signal output terminals, respectively. The temperature sensor and flow sensor are electrically connected to the A / D converter, and the first valve, second valve, third valve, fourth valve, and resistance wire heater are electrically connected to the D / A converter. A timer for timing the working time of the resistance wire heater is electrically connected to the microcontroller.

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