Liquid-phase carbon dioxide vaporization device with steam as heating medium

Abstract

The utility model relates to a liquid-phase carbon dioxide vaporization device with steam as a heating medium. The device comprises a water bath type vaporizer, a first stainless steel coil pipe used for allowing steam to pass through and a second stainless steel coil pipe used for vaporizing liquid-phase carbon dioxide are arranged in the water bath type vaporizer, a top shell inlet of the water bath type vaporizer is connected with a primary water pipe network, and an overflow port is formed in the upper portion of the water bath type vaporizer; the device has the characteristics of low energy consumption, simplicity and convenience in operation, stability in operation and safety and reliability in operation.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid phase carbon dioxide vaporization, in particular to a liquid phase carbon dioxide vaporization device using steam as a heat medium. Background Art

[0002] At present, the production method of liquid carbon dioxide vaporization mainly adopts air-temperature vaporizer; because the air-temperature vaporizer adopts star-shaped aluminum fin tubes, in order to ensure good ventilation effect, the gap between the star-shaped fin tubes is wide, so the air-temperature vaporizer occupies a large area; due to the uncertainty of air supply time and ambient temperature, the air supply stability of the air-temperature vaporizer is poor; the outer surface of the fin tube of the air-temperature vaporizer is greatly affected by the surrounding air temperature and relative humidity, and the vaporization process absorbs the surrounding heat, causing the surrounding temperature to drop, and the water vapor in the air changes to a solid state and adheres to the surface of the air-temperature vaporizer, resulting in frost. Over time, the frost layer accumulates into ice; the continuous operation of the air-temperature vaporizer will be long, and frost and ice will occur, resulting in increased thermal resistance, which seriously affects the heat exchange efficiency of the air-temperature vaporizer. Utility Model Content

[0003] The purpose of the utility model is to provide a liquid phase carbon dioxide vaporization device using steam as a heat medium to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A liquid carbon dioxide vaporization device using steam as a heat medium comprises a water bath vaporizer, a first stainless steel coil for passing steam and a second stainless steel coil for vaporizing liquid carbon dioxide are arranged inside the water bath vaporizer, the top shell inlet of the water bath vaporizer is connected to a primary water pipe network, and an overflow port is arranged at the top of the water bath vaporizer.

[0006] The beneficial effects of the utility model are as follows: by arranging the first stainless steel coil and the second stainless steel coil in the water bath evaporator, steam is used as the heat medium, and the primary water in the water bath evaporator shell is used as the heat exchange medium, so that the coil spacing inside the first stainless steel coil and the second stainless steel coil can be within a smaller range, thereby achieving the goal of reducing the footprint of the equipment, and avoiding the problem of poor gas supply stability caused by the influence of ambient temperature on the carbon dioxide evaporation process; further, since the water bath evaporator is in contact with the outside world, and the large amount of primary water and the large specific heat of water can avoid the phenomenon of frost forming on the outside of the water bath evaporator.

[0007] Preferably, the inlet of the second stainless steel coil is connected to the liquid phase outlet in the liquid carbon dioxide storage tank via a cut-off valve, and the outlet of the second stainless steel coil is connected to the carbon dioxide gas-using equipment via a self-operated pressure reducing valve.

[0008] Preferably, a tee is provided between the outlet of the second stainless steel coil and the self-operated pressure reducing valve, and the third end of the tee is connected to the gas phase inlet in the liquid carbon dioxide storage tank through a second regulating valve.

[0009] Preferably, an overflow pipe is provided on the overflow port.

[0010] Preferably, the inlet of the first stainless steel coil is connected to the first regulating valve and the outlet of the steam buffer tank, and the outlet of the first stainless steel coil is connected to the condensate network through a steam trap.

[0011] The utility model also comprises a temperature sensor which is arranged on the water bath type vaporizer and is used for detecting the temperature inside the shell of the water bath type vaporizer.

[0012] Preferably, a water replenishment valve is provided between the primary water pipe network and the top shell inlet of the water bath evaporator.

[0013] A liquid phase carbon dioxide vaporization device using steam as a heat medium is manufactured according to the above scheme, and is configured to heat the primary water in the water bath vaporizer shell through the first stainless steel coil of steam as a heat source, so that the primary water is used as a heat exchange medium to vaporize the liquid phase carbon dioxide in the second stainless steel coil, and the gaseous carbon dioxide flow rate is not less than 6000Nm 3 / h; Compared with the traditional liquid carbon dioxide vaporization technology, the utility model has the following advantages: 1. The stainless steel coil in the water bath vaporizer is immersed in the primary water, and the coil spacing is within a small range, that is, it satisfies the full contact with the primary water, the overall structure is compact, and the floor space is effectively reduced; the stainless steel coil is in full contact with the primary water, and the heat exchange efficiency is high. 2. The control loop is formed by the first regulating valve and the primary water temperature measuring point of the water bath vaporizer, and the sensible heat of the low-pressure saturated steam is fully utilized. The primary water temperature of the water bath vaporizer is not affected by the environment, which effectively improves the heat exchange efficiency; 3. Due to the large amount of primary water and large specific heat in the shell of the water bath vaporizer, its temperature is relatively stable, thereby achieving the advantages of no freezing of the water bath vaporizer shell and stronger gas supply stability. The setting of the utility model can greatly improve the thermodynamic utilization efficiency while solving the problem of small and unstable liquid carbon dioxide vaporization; it has the characteristics of low energy consumption, simple operation, stable operation, safe and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] In the figure: 1. Steam buffer tank; 2. Liquid carbon dioxide storage tank; 3. Water bath vaporizer; 4. Shut-off valve; 5. First regulating valve; 6. Self-operated pressure reducing valve; 7. Second regulating valve; 8. Steam trap; 9. Primary water network; 10. Overflow port; 11. Carbon dioxide gas equipment; 12. Overflow pipe; 13. Condensate network; 14. Water supply valve; 15. Tee; 16. Liquid phase outlet; 17. Gas phase inlet; 18. First stainless steel coil; 19. Second stainless steel coil; 20. Temperature sensor. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0017] Reference Figure 1 As shown, a liquid-phase carbon dioxide vaporization device using steam as a heat medium includes a water bath vaporizer 3, a first stainless steel coil 18 for passing steam and a second stainless steel coil 19 for vaporizing liquid-phase carbon dioxide are provided inside the water bath vaporizer 3, the top shell inlet of the water bath vaporizer 3 is connected to the primary water network 9, and an overflow port 10 is provided at the upper part of the water bath vaporizer 3. The liquid-phase carbon dioxide vaporization device in the utility model is based on the water bath vaporizer 3, and uses the steam from the first stainless steel coil 18 as a heat medium, and uses the first stainless steel coil 18 and the primary water in the shell of the water bath vaporizer 3 as a heat exchange medium to exchange heat with the liquid-phase carbon dioxide from the second stainless steel coil 19, so as to achieve the purpose of vaporizing carbon dioxide.

[0018] Furthermore, the inlet of the second stainless steel coil 19 is connected to the liquid phase outlet 16 in the liquid carbon dioxide storage tank 2 through the first shut-off valve 4, and the outlet of the second stainless steel coil 19 is connected to the carbon dioxide gas-using device 11 through the self-operated pressure reducing valve 6. In the utility model, the liquid carbon dioxide in the liquid carbon dioxide storage tank 2 enters the second stainless steel coil 19, and after vaporization, the gaseous carbon dioxide is supplied to the carbon dioxide gas-using device 11 through the self-operated pressure reducing valve 6.

[0019] Furthermore, a tee 15 is provided between the outlet of the second stainless steel coil 19 and the self-operated pressure reducing valve 6, and the third end of the tee 15 is connected to the gas phase inlet 17 in the liquid carbon dioxide storage tank 2 through the second regulating valve 7. The utility model can provide a tee 15 between the outlet of the second stainless steel coil 19 and the self-operated pressure reducing valve 6, and introduce gaseous carbon dioxide into the liquid carbon dioxide storage tank 2 to increase the liquid carbon dioxide storage tank 2.

[0020] Furthermore, an overflow pipe 12 is provided on the overflow port 10 .

[0021] Furthermore, the inlet of the first stainless steel coil 18 is connected to the outlet of the steam buffer tank 1 through the first regulating valve 5, and the outlet of the first stainless steel coil 18 is connected to the condensate network 13 through the steam trap 8. The above arrangement enables the low-pressure saturated steam in the steam buffer tank 1 to enter the first stainless steel coil 18 to exchange heat with the primary water. The heat exchange of the primary water can not only provide heat for the liquid carbon dioxide, but also prevent the outer surface of the water bath vaporizer 3 from frosting, thereby avoiding affecting the vaporization efficiency of the carbon dioxide.

[0022] The utility model further includes a temperature sensor 20 disposed on the water bath vaporizer 3 for detecting the temperature inside the shell of the water bath vaporizer 3. By disposing the temperature sensor 20, the temperature of the primary water inside the shell of the water bath vaporizer 3 can be detected in real time, so as to improve the carbon dioxide vaporization efficiency and avoid the problem of frost on the surface of the water bath vaporizer 3, and at the same time provide a basis for the opening of the first regulating valve 5.

[0023] Furthermore, a water supply valve 14 is provided between the primary water pipe network 9 and the top shell inlet of the water bath evaporator 3 .

[0024] The working principle of the utility model includes the following steps: Step 1: The liquid carbon dioxide in the liquid carbon dioxide storage tank 2 is successively vaporized by heat exchange with primary water through the second stainless steel coil 19 inside the water bath vaporizer 3, and then enters the carbon dioxide gas-using equipment 11 through the self-operated pressure reducing valve 6. The temperature of the liquid carbon dioxide in the second stainless steel coil 19 is -25°C and the pressure is 1.8MpaG; Step 2: A part of the vaporized carbon dioxide in step 1 enters the liquid carbon dioxide storage tank 2 through the three-way 15, the second regulating valve 7 and the gas phase inlet 17 in the liquid carbon dioxide storage tank 2 to pressurize the liquid carbon dioxide storage tank 2; the vaporized carbon dioxide has a temperature of 35°C and a pressure of 1.8MpaG. Step 3: The low-pressure saturated steam of the steam buffer tank 1 successively enters the condensate pipe network 13 through the first stainless steel coil 18 and the steam trap 8 in the water bath vaporizer 3; the above-mentioned low-pressure saturated steam heats the primary water in step 1 and raises the temperature; the temperature of the heated primary water is 85°C and normal pressure. Step 4: The primary water in step 1 enters the shell of the water bath vaporizer 3 through the primary water pipe network 9 for water replenishment; the excess primary water is discharged through the overflow port 10 and the overflow pipe 12. The utility model uses steam to heat the primary water in the water bath vaporizer, and then produces gaseous carbon dioxide by vaporizing the liquid carbon dioxide passing through the primary water heating coil. The flow rate of gaseous carbon dioxide is not less than 6000Nm 3 / h, wherein the stainless steel coils in the water bath vaporizer are immersed in primary water, and the coil spacing is within a small range, that is, sufficient contact with the primary water is met, the overall structure is compact, and the floor space is effectively reduced; the stainless steel coils are in full contact with the primary water, and the heat exchange efficiency is high. In addition, a control loop is formed by the first regulating valve and the primary water temperature measuring point of the water bath vaporizer, and the sensible heat of low-pressure saturated steam is fully utilized, and the primary water temperature of the water bath vaporizer is not affected by the environment; further, since the primary water temperature of the water bath vaporizer is stable, the shell of the water bath vaporizer is not frozen, and the gas supply is more stable. The setting of the utility model can greatly improve the thermodynamic utilization efficiency while solving the problem of small and unstable vaporization of liquid carbon dioxide; it has the characteristics of low energy consumption, simple operation, stable operation, safe and reliable operation.

[0025] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A liquid phase carbon dioxide vaporization device using steam as a heat medium, characterized in that: The device comprises a water bath vaporizer (3), wherein a first stainless steel coil (18) for passing steam and a second stainless steel coil (19) for vaporizing liquid carbon dioxide are arranged inside the water bath vaporizer (3), a top shell inlet of the water bath vaporizer (3) is connected to a primary water pipe network (9), and an overflow port (10) is arranged at the top of the water bath vaporizer (3).

2. The liquid phase carbon dioxide vaporization device using steam as heat medium according to claim 1, characterized in that: The inlet of the second stainless steel coil (19) is connected to the liquid phase outlet (16) in the liquid carbon dioxide storage tank (2) via a cut-off valve (4), and the outlet of the second stainless steel coil (19) is connected to the carbon dioxide gas-using equipment (11) via a self-operated pressure reducing valve (6).

3. The liquid phase carbon dioxide vaporization device using steam as heat medium according to claim 2, characterized in that: A tee (15) is provided between the outlet of the second stainless steel coil (19) and the self-operated pressure reducing valve (6), and the third end of the tee (15) is connected to the gas phase inlet (17) in the liquid carbon dioxide storage tank (2) through a second regulating valve (7).

4. The liquid phase carbon dioxide vaporization device using steam as heat medium according to claim 1, characterized in that: An overflow pipe (12) is provided on the overflow port (10).

5. The device for vaporizing liquid carbon dioxide using steam as a heat medium according to claim 1, characterized in that: The inlet of the first stainless steel coil (18) is connected to the first regulating valve (5) and the outlet of the steam buffer tank (1), and the outlet of the first stainless steel coil (18) is connected to the condensate pipe network (13) via a steam trap (8).

6. The device for vaporizing liquid carbon dioxide using steam as a heat medium according to claim 5, characterized in that: It also includes a temperature sensor (20) arranged on the water bath vaporizer (3) for detecting the temperature inside the shell of the water bath vaporizer (3).

7. The device for vaporizing liquid carbon dioxide using steam as a heat medium according to claim 1, characterized in that: A water replenishment valve (14) is provided between the primary water pipe network (9) and the top shell inlet of the water bath vaporizer (3).

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