Hot water recycling water bath type vaporizer

Abstract

The utility model discloses a hot water recirculation water bath type vaporizer which comprises a tank body, a plurality of heat exchange pipes, a circulating pipe and a circulating pump, the two ends of the circulating pipe are located above and below the heat exchange pipe respectively. The heat exchange pipes are enclosed to form a ring; a heating pipe penetrating through the ring is longitudinally arranged in the tank body; a plurality of scattering holes are formed in the lower part of the outer wall of the heating pipe; a steam connecting pipe is arranged at the upper end of the heating pipe; the inner diameter of the steam connecting pipe is larger than that of the heating pipe. When the using requirement for high gas yield is met, the circulating pump drives the heat medium to circulate from bottom to top in a reciprocating mode, and then the gasification speed and the gasification amount of low-temperature liquid are increased. Under the condition that the circulating pump does not work or intermittently works in the face of the use requirement of low gas yield, the temperature of the upper portion of the tank body cannot be too low through heat emitted by the heat exchange pipe, the situation that gas is liquefied again is prevented, the energy consumption is lower, and the cost performance is high.

Description

Technical Field

[0001] This utility model belongs to the technical field of air separation equipment, and in particular relates to a hot water recirculation water bath vaporizer. Background Technology

[0002] In the field of air separation equipment, water bath vaporizers are used for cryogenic liquid vaporization. The typical problems and drawbacks of water bath vaporizer design are: 1. Water bath vaporizers rely solely on steam to heat the water inside the shell. The increased water temperature causes the cryogenic liquid passing through heat exchange tubes arranged inside the shell to absorb heat, achieving vaporization and supplying gas to the user. This does not fully utilize hot water circulation to increase the amount of cryogenic liquid vaporized. 2. Heating steam enters the shell through pipelines, raising the water temperature. The temperature and flow rate of the gas directly affect the vaporization effect of the cryogenic liquid. When it is necessary to increase the amount of cryogenic liquid vaporized, the steam consumption or temperature needs to be increased, thus increasing the cost of the steam heat source.

[0003] Chinese patent document CN209926014U discloses a hot water circulating water bath vaporizer, including a cylindrical body. A steam inlet pipe is provided at the bottom left end of the side of the cylindrical body. An annular steam spray pipe is connected to the bottom end of the steam inlet pipe. An annular steam spray pipe support is provided at the bottom side of the annular steam spray pipe. A liquid oxygen inlet pipe is provided on the side of the cylindrical body behind the steam inlet pipe. An energy exchange pipe is connected to the right end of the liquid oxygen inlet pipe. The side of the energy exchange pipe is fixed by a central support. The energy exchange pipe and the liquid oxygen inlet pipe are fixed by a fixing bracket. An oxygen outlet branch pipe is connected to the top end of the energy exchange pipe. The ends of the oxygen outlet branch pipe that are close to each other are connected to the main oxygen outlet pipe.

[0004] In the aforementioned patented solution, hot steam is pumped into the bottom of the cylinder through an annular steam spray pipe, and the water in the upper and lower parts of the cylinder is circulated by a circulating water pump. However, when facing low gas production requirements, activating the circulating water pump often results in excessive gas production, which is also wasteful of resources. On the other hand, without activating the circulating water pump, the hot water at the bottom of the cylinder transfers heat to the upper part relatively slowly, resulting in slow gas production. Moreover, heat is absorbed by the energy exchange pipe in between, which may even cause the temperature in the upper part of the cylinder to be low, leading to the re-liquefaction of vaporized gas in the upper part. Utility Model Content

[0005] To overcome the technical problems of existing circulating water bath vaporizers, where activating the circulating water pump leads to excessive gas production and resource waste when demanding low gas output, while not activating the circulating water pump results in ineffective heat transfer from the bottom to the upper part of the tank, causing slow gas production and even gas re-liquefaction, this invention aims to provide a hot water recirculating water bath vaporizer. This vaporizer features a top-down heating pipe in the middle of the tank, with heat exchange pipes surrounding the heating pipes. The bottom of the heating pipes has diffuser holes for steam emission. When demanding high gas output, the circulating pump allows the heat medium in the lower part of the tank to flow upwards. When demanding low gas output, the circulating pump operates inactively or intermittently, and the heat dissipated by the heating pipes maintains the temperature of the upper part of the tank, preventing it from becoming too cold and causing gas liquefaction.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a hot water recirculation water bath vaporizer, comprising a longitudinally arranged tank, multiple heat exchange tubes arranged in the middle of the tank, a circulation pipe arranged on the outer wall of the tank, and a circulation pump arranged on the circulation pipe; the two ends of the circulation pipe are respectively located above and below the heat exchange tubes; wherein, each of the heat exchange tubes forms an annulus coaxially arranged with the tank; a heating tube is longitudinally arranged inside the tank and passes through the annulus; multiple scattering holes communicating with the heating tube are arranged on the lower part of the outer wall of the heating tube; a steam pipe communicating with the heating tube is arranged at the upper end of the heating tube; the inner diameter of the steam pipe is larger than the inner diameter of the heating tube.

[0007] After the hot steam input through the steam pipe enters the heating pipe, the inner diameter decreases, increasing the flow pressure of the hot steam. This increases the pressure of the steam ejected outward through the scattering hole, allowing the hot steam to diffuse a greater distance to the outer periphery, thereby helping to improve the heat exchange rate of the medium (such as water) in the tank.

[0008] Furthermore, two annular tubes are respectively arranged above and below the heat exchange tube inside the tank; the diameters of the two annular tubes are not equal; the annular tubes are connected to the heat exchange tube; an output tube connected to the two adjacent annular tubes is arranged at the upper part of the tank; a large-diameter tube extending to the upper part of the output tube is arranged at the upper end of the output tube; the inner diameter of the large-diameter tube is larger than the inner diameter of the output tube.

[0009] After the gas enters the large-diameter pipe, the cross-sectional area of ​​the gas increases, which reduces the gas flow pressure. This reduces the flow pressure and impact force of the externally output gas, ensuring the structural strength of the pipeline and the stability of gas delivery.

[0010] Specifically, a liquid level pipe is provided on the upper part of the outer wall of the tank; the lower end and the upper end of the liquid level pipe are located below and above the two annular pipes above, respectively; the two ends of the liquid level pipe are respectively connected to the inside of the tank.

[0011] The liquid level tube is used to observe the water level of the medium inside the tank, providing a control basis for controlling the vaporization process of the vaporizer.

[0012] Furthermore, the lower part of the tank is provided with an input pipe that communicates with two adjacent annular pipes; the lower end of the input pipe is provided with a small-diameter pipe that communicates with the input pipe; the inner diameter of the small-diameter pipe is smaller than the inner diameter of the input pipe; the small-diameter pipe extends out from the outer wall of the lower part of the tank.

[0013] The liquid flowing into the input pipe through the small-diameter pipe has a smaller cross-sectional area, which reduces the flow resistance and flow pressure, thereby reducing the impact and flow pressure of the corresponding annular pipe.

[0014] Specifically, the input tube and the output tube are located inside the corresponding annular tube; the input tube and the output tube are located at extreme positions far apart from each other.

[0015] The liquid medium enters through the input pipe and exits through the output pipe. The input and output pipes provide space for the arrangement of the heating pipe. Although not located in the middle of the annular pipe, the input and output pipes are arranged close to the sides, which also helps to improve the uniform and rapid flow of the liquid and gaseous media.

[0016] Furthermore, the outer wall of the annular tube is provided with a plurality of uniformly distributed sleeves on the side facing the heat exchange tube; the end of the sleeve is provided with a stepped hole; a connecting pipe is inserted into the stepped hole; the connecting pipe is connected to the heat exchange tube.

[0017] Furthermore, the upper end of the circulation tube is directly opposite the middle of the two annular tubes above it.

[0018] The hot water flowing out from the upper end of the circulation pipe is scattered in a cone shape onto the two annular pipes above; while heating the annular pipes, the length of the circulation pipe is shortened as much as possible to improve heat exchange efficiency.

[0019] Furthermore, the outer wall of the tank is provided with a first temperature control port directly opposite the middle of the heat exchange tube; the outer wall of the tank is provided with a second temperature control port directly opposite the middle of the two annular tubes below.

[0020] The sensor installed inside the first temperature control port is used to detect the medium temperature of the heat exchange tube; the sensor installed inside the second temperature control port is used to detect the medium temperature at the bottom of the tank.

[0021] Specifically, a support frame is provided at the bottom of the middle position of the tank; the lower end of the heating pipe is provided on the support frame; the upper end of the heating pipe is provided with a bend; the steam connection is provided at the upper end of the bend; and the steam connection extends to the top of the tank.

[0022] Specifically, the heat exchange tube is spiral-shaped; a support is provided on the lower part of the outer wall of the tank; the circulation pump is located on the upper end of the support; the circulation tube includes a lower tube communicating with the inlet of the circulation pump and an upper tube communicating with the outlet of the circulation pump; the upper end of the lower tube and the lower end of the upper tube are horizontally arranged on the circulation pump.

[0023] Compared to existing technologies, the advantages of this invention are as follows: This invention features a bottom-up heating pipe in the middle of the tank, with a scattering hole at the bottom of the heating pipe for ejecting hot steam. When high gas production is required, the circulating pump drives the heating medium to circulate repeatedly from bottom to top, accelerating the heating rate of the medium and thus accelerating the vaporization rate of the cryogenic liquid, increasing the amount of cryogenic liquid vaporized. When low gas production is required, and the circulating pump is not working or operates intermittently, the heat emitted by the heat exchange pipe prevents the temperature of the upper part of the tank from becoming too low, preventing gas re-liquefaction. This results in lower energy consumption and higher cost-effectiveness. It is particularly suitable for users with large and fluctuating gas demand, effectively reducing overall equipment operating costs and enhancing the market competitiveness of the company's products. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0025] Figure 2 This is a top view of the structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the connection structure of the connecting pipe and the annular pipe of this utility model.

[0027] In the diagram: 1. Tank body; 11. Overflow port; 12. Liquid level pipe; 121. First valve; 13. First temperature control port; 14. Second temperature control port; 15. Drain pipe; 16. Water inlet; 2. Heat exchange pipe; 21. Connecting pipe; 22. Ring pipe; 221. Sleeve; 222. Stepped hole; 31. Output pipe; 32. Large diameter pipe; 41. Input pipe; 42. Small diameter pipe; 5. Heating pipe; 51. Steam connection pipe; 52. Diffuser hole; 53. Support frame; 61. Circulation pipe; 611. Lower pipe; 612. Upper pipe; 62. Circulation pump; 63. Second valve; 64. Bracket. Detailed Implementation

[0028] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" are 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 element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, terms such as "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] See Figures 1-3 A hot water recirculation water bath vaporizer includes a longitudinally arranged tank 1 containing water, a plurality of spiral heat exchange tubes 2 arranged in the middle of the tank 1, and a heating tube 5 arranged longitudinally from bottom to top in the center of the tank 1; each of the heat exchange tubes 2 is arranged in a ring coaxially with the tank 1; the heating tube 5 passes through the ring.

[0033] A support frame 53 is provided at the bottom of the middle position of the tank body 1; a plurality of scattering holes 52 are provided on the lower part of the outer wall of the heating pipe 5 above the support frame 53; each of the scattering holes 52 is evenly arranged along the circumferential direction; a bend is provided at the upper end of the heating pipe 5; a steam pipe 51 communicating with the heating pipe 5 is provided at the upper end of the bend; the inner diameter of the steam pipe 51 is larger than the inner diameter of the heating pipe 5; the steam pipe 51 extends to the top of the tank body 1.

[0034] Inside the tank 1, two annular tubes 22 are respectively arranged above and below the heat exchange tube 2; the annular tubes 22 are connected to the heat exchange tube 2; the diameters of the two annular tubes 22 are not equal; a plurality of uniformly distributed sleeves 221 are arranged on the outer wall of the annular tube 22 facing the heat exchange tube 2; a stepped hole 222 is provided at the end of the sleeve 221; a connecting pipe 21 is inserted into the stepped hole 222; the connecting pipe 21 is connected to the heat exchange tube 2.

[0035] A circulation pipe 61 is provided on the outer wall of the tank body 1; a support 64 is provided on the lower part of the outer wall of the tank body 1; a circulation pump 62 is provided on the upper end of the support 64; the circulation pipe 61 includes a lower pipe 611 communicating with the inlet of the circulation pump 62 and an upper pipe 612 communicating with the outlet of the circulation pump 62; the upper end of the lower pipe 611 and the lower end of the upper pipe 612 are horizontally arranged on the circulation pump 62; a second valve 63 is provided on the end of the upper pipe 612 and the lower pipe 611 near the circulation pump 62; the lower end of the lower pipe 611 is located at the inner bottom of the tank body 1; the upper end of the upper pipe 612 is directly opposite the middle of the two adjacent annular pipes 22.

[0036] The upper part of the tank body 1 is provided with an output pipe 31 that communicates with two adjacent annular pipes 22; the upper end of the output pipe 31 is provided with a large-diameter pipe 32 that extends to the top of the tank body 1; the inner diameter of the large-diameter pipe 32 is larger than the inner diameter of the output pipe 31.

[0037] A liquid level pipe 12 is provided on the upper part of the outer wall of the tank body 1; the lower end and the upper end of the liquid level pipe 12 are located below and above the two annular pipes 22 above, respectively; both ends of the liquid level pipe 12 are connected to the inside of the tank body 1; a first valve 121 is provided between the two ends of the liquid level pipe 12 and the tank body 1, respectively.

[0038] The lower part of the tank body 1 is provided with an input pipe 41 that communicates with two adjacent annular pipes 22; a small-diameter pipe 42 that communicates with the input pipe 41 is horizontally provided at the lower end of the input pipe 41; the inner diameter of the small-diameter pipe 42 is smaller than the inner diameter of the input pipe 41; the small-diameter pipe 42 extends out from the outer wall of the lower part of the tank body 1.

[0039] The input tube 41 and the output tube 31 are respectively located inside the corresponding annular tube 22; the input tube 41 and the output tube 31 are located at extreme positions far apart from each other.

[0040] The outer wall of the tank body 1 is provided with a first temperature control port 13 that is directly opposite the middle of the heat exchange tube 2; the outer wall of the tank body 1 is provided with a second temperature control port 14 that is directly opposite the middle of the two annular tubes 22 below.

[0041] An overflow port 11 is provided on the inner wall of the tank 1 near the upper end; a sewage outlet 15 is provided on the inner wall of the tank 1 near the lower end; and a water inlet 16 is provided on the inner wall of the tank 1 near the lower end.

[0042] High-temperature steam is introduced through steam pipe 51, passes through heating pipe 5, and is evenly sprayed out from scattering hole 52 to heat the water in tank 1. Liquid medium fluid is introduced through small diameter pipe 42, and passes sequentially through input pipe 41, lower annular pipe 22, lower connecting pipe 21, heat exchange pipe 2, upper connecting pipe 21, upper annular pipe 22, output pipe 31, and large diameter pipe 32. The liquid medium fluid passing through heat exchange pipe 2 absorbs heat from the water in tank 1, vaporizes into gas, and is finally output from large diameter pipe 32.

[0043] When high gas production is required, the circulation pump 62 operates, drawing the heated water from the lower part of tank 1 to the upper part of tank 1, and the water in the upper part of tank 1 is replenished downwards. This process is repeated to form a water circulation, so that the water in tank 1 is heated evenly, improving the heat exchange effect with the heat exchange tube 2, and increasing the gas production and gas production rate.

[0044] When the gas production demand is low, the circulating pump 62 does not work or works intermittently. The heat on the heating tube 5 diffuses to the heat exchange tube 2 on the outer periphery, so that the temperature in the upper part of the tank 1, that is, the location of the heat exchange tube 2, does not drop too low (the vaporization of the liquid medium will absorb heat), thus preventing the gas from liquefying again.

[0045] The above description is only a specific embodiment of the present utility model, but the technical features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A hot water recirculation water bath vaporizer, characterized in that: The device includes a longitudinally arranged tank, multiple heat exchange tubes located in the middle of the tank, a circulation pipe located on the outer wall of the tank, and a circulation pump mounted on the circulation pipe. The two ends of the circulation pipe are located above and below the heat exchange tubes, respectively. Each heat exchange tube forms a ring coaxially with the tank. A heating tube is longitudinally arranged inside the tank, passing through the ring. Multiple scattering holes communicating with the heating tube are located on the lower part of the outer wall of the heating tube. A steam connector communicating with the heating tube is located at the upper end of the heating tube. The inner diameter of the steam connector is larger than the inner diameter of the heating tube.

2. The vaporizer as described in claim 1, characterized in that: The tank body contains two annular tubes located above and below the heat exchange tube, respectively; the diameters of the two annular tubes are not equal; the annular tubes are connected to the heat exchange tubes; an output tube connected to the two adjacent annular tubes is provided at the upper part of the tank body; a large-diameter tube extending from the upper end of the output tube to the top of the tank body is provided; the inner diameter of the large-diameter tube is larger than the inner diameter of the output tube.

3. The vaporizer as described in claim 2, characterized in that: A liquid level pipe is provided on the upper part of the outer wall of the tank; the lower end and the upper end of the liquid level pipe are located below and above the two annular pipes above, respectively; both ends of the liquid level pipe are connected to the inside of the tank.

4. The vaporizer as described in any one of claims 2-3, characterized in that: The lower part of the tank is provided with an input pipe that communicates with two adjacent annular pipes; the lower end of the input pipe is provided with a small-diameter pipe that communicates with the input pipe; the inner diameter of the small-diameter pipe is smaller than the inner diameter of the input pipe; the small-diameter pipe extends from the outer wall of the lower part of the tank.

5. The vaporizer as described in claim 4, characterized in that: The input tube and the output tube are respectively located inside the corresponding annular tube; the input tube and the output tube are located at extreme positions far apart from each other.

6. The vaporizer as described in any one of claims 2-3, characterized in that: The outer wall of the annular tube is provided with a plurality of uniformly distributed sleeves on the side facing the heat exchange tube; the end of the sleeve is provided with a stepped hole; a connecting pipe is inserted into the stepped hole; the connecting pipe is connected to the heat exchange tube.

7. The vaporizer according to any one of claims 2-3, characterized in that: The upper end of the circulation tube is directly opposite the middle of the two annular tubes above it.

8. The vaporizer as described in any one of claims 2-3, characterized in that: The outer wall of the tank is provided with a first temperature control port that is directly opposite the middle of the heat exchange tube; the outer wall of the tank is provided with a second temperature control port that is directly opposite the middle of the two annular tubes below.

9. The vaporizer according to any one of claims 1-3, characterized in that: A support frame is provided at the bottom of the middle position of the tank; the lower end of the heating pipe is provided on the support frame; the upper end of the heating pipe is provided with a bend; the steam connection is provided at the upper end of the bend; the steam connection extends to the top of the tank.

10. The vaporizer according to any one of claims 1-3, characterized in that: The heat exchange tube is spiral-shaped; a support is provided on the lower part of the outer wall of the tank; the circulation pump is located on the upper end of the support; the circulation tube includes a lower tube communicating with the inlet of the circulation pump and an upper tube communicating with the outlet of the circulation pump; the upper end of the lower tube and the lower end of the upper tube are horizontally arranged on the circulation pump.

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