A liquid collecting and distributing pipe structure for preventing biased flow of a cryogenic medium heat exchanger

Abstract

The present invention relates to the technical field of submerged combustion gasifiers, and specifically to a cryogenic medium heat exchanger anti-bias flow liquid collecting and distributing pipe structure, comprising a heat exchanger body, a liquid inlet pipe is arranged in the heat exchanger body, the liquid inlet pipe is connected to an external pipe, a buffer pipe is arranged on the outside of the liquid inlet pipe, a plurality of flow holes are evenly opened at the bottom of the liquid inlet pipe, the buffer pipe and the liquid inlet pipe are connected through the flow holes, a heat exchange pipe is also arranged in the heat exchanger body, a plurality of pipe holes are evenly opened at the top of the buffer pipe, the heat exchange pipe and the buffer pipe are connected through the pipe holes, thereby adding a buffer pipe outside the liquid inlet pipe and allowing the cryogenic liquid to first enter the buffer pipe from the bottom of the liquid inlet pipe, and then the liquid level rises and finally overflows into the heat exchange pipe, so that the cryogenic liquid can evenly enter multiple heat exchange pipes, thereby reducing the possibility of bias flow.

Description

Technical Field

[0001] The invention relates to the technical field of submerged combustion gasifiers, and in particular to a liquid collecting and distributing pipe structure for preventing biased flow of a cryogenic medium heat exchanger. Background Art

[0002] In the existing field of submerged combustion gasifiers, heat exchanger equipment under traditional design is very prone to direct flow deviation during the heat exchange process due to the uneven distribution of resistance in the pipeline. Deviation flow will cause the liquid to be unable to be evenly distributed in each heat exchange tube, or cause the medium in some heat exchange tubes to not be completely vaporized, resulting in low outlet temperature, which in turn affects the normal heat exchange efficiency and vaporization volume, and may cause the possibility of low-temperature brittle explosion hazards to downstream pipelines.

[0003] The Chinese utility model patent "Submerged Combustion Gasifier" with publication number CN209782233U discloses a new gasifier structure that solves the need for on-site debugging and a large amount of installation work by improving the traditional gasifier structure. The various components of the gasifier, such as the burner, furnace, flue gas duct, water tank, gasification duct, water supply duct and chimney, are all installed in a fixed skid-mounted manner, so that the submerged combustion gasifier can be precisely assembled and debugged in the manufacturing plant. When the customer needs it, the submerged combustion gasifier can be directly transported to the customer's location like a container, which greatly shortens the delivery cycle and realizes the function of the product being able to be used as soon as it is landed.

[0004] However, in the actual production process, it was found that although the installation of the submerged combustion gasifier has become simpler, there are still problems such as uneven resistance in the pipeline and the tendency of the cryogenic liquid to flow sideways. If the problem of the inlet distribution of the cryogenic medium is not solved to a certain extent, it will affect the normal use of the equipment, and the gasification effect and gas outlet temperature brought to the user will have a certain impact, and even cause danger. Therefore, solving the phenomenon of the flow sideways of the cryogenic medium in the pipeline can be said to be a difficult problem that must be solved in today's industry. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a liquid collecting and distributing pipe structure for preventing bias flow in a cryogenic medium heat exchanger. The technical problem to be solved is how to reduce the possibility of bias flow by improving the traditional liquid collecting and distributing pipe structure, thereby improving the heat exchange efficiency and preventing the occurrence of hazards.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is: a cryogenic medium heat exchanger anti-bias flow liquid collection and distribution pipe structure, including a heat exchanger body, a liquid inlet pipe is arranged in the heat exchanger body, the liquid inlet pipe is connected with an external pipe, a buffer pipe is arranged on the outside of the liquid inlet pipe, a plurality of flow holes are evenly opened at the bottom of the liquid inlet pipe, the buffer pipe and the liquid inlet pipe are connected through the flow holes, a heat exchange pipe is also arranged in the heat exchanger body, a plurality of pipe holes are evenly opened at the top of the buffer pipe, the heat exchange pipe and the buffer pipe are connected through the pipe holes, thereby adding a buffer pipe outside the liquid inlet pipe and allowing the cryogenic liquid to first enter the buffer pipe from the bottom of the liquid inlet pipe, and then the liquid level rises and finally overflows into the heat exchange pipe, so that the cryogenic liquid can evenly enter multiple heat exchange pipes, thereby reducing the possibility of bias flow.

[0007] Furthermore, the flow hole is vertically opened at the bottom of the liquid inlet pipe. The vertical opening design can ensure sufficient fluidity of the cryogenic liquid and enable it to quickly enter the buffer tube.

[0008] Furthermore, the sum of the opening cross-sectional areas of the flow holes is larger than the cross-sectional area of ​​the liquid inlet pipe, which can ensure sufficient flow and prevent the flow entering the heat exchange tube from being reduced due to the addition of a buffer tube, thereby affecting the normal flow working efficiency.

[0009] Furthermore, a pressure stabilizing plate is provided in the buffer tube, and the pressure stabilizing plate is close to the hole of the heat exchange pipe. Thus, a pressure stabilizing device is added to the buffer tube, so that the cryogenic liquid can be further stabilized when it rises and is about to overflow into the heat exchange tube, thereby further preventing the flow deviation phenomenon caused by uneven resistance in the heat exchange tube.

[0010] Furthermore, the voltage stabilizing plate is installed on the buffer tube through fixing columns. There are two fixing columns which are symmetrically arranged on both sides of the voltage stabilizing plate, thereby limiting the installation method of the voltage stabilizing plate. The fixed connection between the fixing columns and the buffer tube is more stable and less prone to shaking, thereby being able to effectively stabilize the pressure of the cryogenic liquid. The purpose of designing the fixing columns on both sides is to reduce the use of materials and to minimize the impact on the cryogenic liquid other than non-pressure stabilization.

[0011] Furthermore, the liquid inlet pipe is connected to a guide pipe, which passes through the buffer pipe and is connected to the external pipeline. The cross-sectional diameter of the guide pipe is smaller than the cross-sectional diameter of the liquid inlet pipe. Therefore, through the design of the guide pipe, the external liquid is introduced into the liquid inlet pipe through the guide pipe, and then enters the liquid inlet pipe. It plays a role specifically used to connect the liquid inlet pipe and the external pipeline. The design purpose of its small cross-sectional diameter is to ensure sufficient flow rate while enabling the normal operation of the liquid inlet pipe, so that the liquid can pass through the flow hole of the liquid inlet pipe.

[0012] Furthermore, a liquid inlet valve is provided on the flow guide pipe, so that the staff can conveniently choose to open or close the liquid inlet valve as needed to start or stop the operation of the gasifier.

[0013] Furthermore, water is arranged in the heat exchanger body, and the buffer tube is arranged at the bottom of the heat exchanger body and immersed in the water, thereby realizing the normal operation of the gasifier by means of a water bath.

[0014] Furthermore, a temperature detector, a pressure sensor and a methane concentration detector are arranged outside the heat exchanger body, and these detection instruments are used to detect the temperature, air pressure and methane concentration at the outlet chimney respectively to ensure sufficient safety.

[0015] In summary, the present invention provides a liquid collecting and distributing pipe structure for preventing bias flow of a cryogenic medium heat exchanger. By adding a buffer pipe on the outside of the liquid inlet pipe and allowing the cryogenic liquid to first enter the buffer pipe from the bottom of the liquid inlet pipe, the liquid level rises and finally overflows into the heat exchange tube. This design enables the cryogenic liquid to evenly enter multiple heat exchange tubes, greatly reducing the possibility of bias flow in the heat exchange tubes, thereby ensuring sufficient heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a structural schematic diagram of a structure of a liquid collecting and distributing pipe for preventing biased flow of a cryogenic medium heat exchanger in an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the partial structure of the liquid inlet pipe and the buffer pipe in an embodiment of a liquid collecting and distributing pipe structure for preventing biased flow of a cryogenic medium heat exchanger according to the present invention;

[0019] In the figure: 1-heat exchanger body, 2-liquid inlet pipe, 3-buffer pipe, 21-circulation hole, 4-heat exchange tube, 31-pipe hole, 41-pressure stabilizing plate, 42-fixed column, 5-flow guide pipe, 51-liquid inlet valve, 11-water, 12-temperature monitor, 13-pressure sensor, 14-methane concentration detector. DETAILED DESCRIPTION

[0020] The preferred examples of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred examples described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0021] like Figure 1 , 2As shown, this cryogenic medium heat exchanger liquid collecting and distributing pipe structure comprises a heat exchanger body 1, inside of which a liquid inlet pipe 2 is arranged, and the liquid inlet pipe 2 is used to pass the cryogenic medium into the heat exchange tube 4 for heat exchange.

[0022] In this embodiment, the cryogenic medium will first enter the liquid inlet pipe 2, and a plurality of flow holes 21 are evenly opened at the bottom of the liquid inlet pipe 2, and a buffer tube 3 is wrapped around the outside of the liquid inlet pipe 2, so the cryogenic medium will pass through the flow holes 21 to enter the buffer tube 3 and accumulate at the bottom of the buffer tube 3. The flow holes 21 are vertically opened at the bottom of the liquid inlet pipe 2, and the sum of the opening cross-sectional areas of all the flow holes 21 is larger than the cross-sectional area of ​​the liquid inlet pipe 2, so the flow rate of the cryogenic medium will not change in the process of entering the buffer tube 3 through the flow holes 21. As the amount of cryogenic medium entering increases, it will accumulate more at the bottom of the buffer tube 3, so a part of it will overflow to the top of the buffer tube 3, and a plurality of pipe holes 31 are evenly opened at the top of the buffer tube 3, and these pipe holes 31 are connected to the heat exchange tube 4 in turn, so that these overflowing cryogenic mediums can enter the heat exchange tube 4 through the pipe holes 31, and the overall flow is very uniform, and it is not easy to produce bias flow in the heat exchange tube 4, thereby affecting the heat exchange efficiency. In the actual production process, the fluidity of the cryogenic liquid in the pipeline is an important factor affecting the working efficiency of the vaporizer. Therefore, the structural design in this technical solution and the corresponding technical effects it produces are important solutions to improve the technical problems existing in the transmission structure, which can greatly improve work efficiency and enhance the user experience.

[0023] At the same time, in this embodiment, a voltage stabilizing plate 41 is also provided in the buffer tube 3, and the voltage stabilizing plate 4 is close to the pipe hole 31, so that when the top of the cryogenic medium is about to overflow into the heat exchange tube 4, it will be further stabilized by the voltage stabilizing plate 4, so that the flow rate is more uniform, and the stability is further improved. In the actual production process, the voltage stabilizing plate 41 can be said to be a design that is both simple and can play a very good effect. When the flow hole 21 is damaged or has other problems, the voltage stabilizing plate 41 can play a role in protecting the voltage stabilizing effect in time.

[0024] Regarding the design of the voltage stabilizing plate 41, it can be kept stable by symmetrically arranging fixing columns 42 on the left and right to fix it to the buffer tube 3. Since the voltage stabilizing plate 41 is a relatively simple and practical design, it requires a relatively more stable and firm fixing installation method. Therefore, the fixing column 42 is a very applicable technical solution. At the same time, the design of being located on the left and right sides of the stabilizing plate 41 can, on the one hand, make the force on the voltage stabilizing plate 41 more balanced, and on the other hand, it will not waste too much raw materials, and will avoid the influence of the non-voltage stabilization effect on the cryogenic liquid as much as possible.

[0025] In this embodiment, the flow guide tube 5 is also provided with a liquid inlet valve 51, which can be said to be a common design of the pipeline, but it is precisely with such a design that the overall workflow is more complete. By opening the liquid inlet valve 51, the cryogenic liquid can be introduced through the flow guide tube 5 to start the normal operation of the vaporizer, and by closing the liquid inlet valve 51, the normal operation of the vaporizer is also closed. At the same time, the design of the valve can also be said to be necessary. Only with the valve can the liquid inlet process of the cryogenic liquid become more controllable, and it can be electrically connected to an external integrated controller to facilitate the staff to control the opening and closing of the valve.

[0026] In this embodiment, water 11 is arranged in the heat exchanger body 1, and the buffer tube 3 is arranged at the bottom of the heat exchanger body 1 and immersed in the water 11, so that a water bath is adopted to ensure the normal operation of the gasifier as a whole. In the actual production process, the submerged combustion gasifier fully utilizes the natural gas combustion method, uses the high-temperature flue gas generated by the natural gas combustion as a heat source, directly heats the water, and the hot water heats the LNG coil in the immersion pool, thereby completing the normal operation of the gasifier.

[0027] In this embodiment, a temperature detector 12, a pressure sensor 13 and a methane concentration detector 14 are provided on the outside of the heat exchanger body 1. These detection instruments can be installed at the chimney outlet of the gasifier body 1, and are used to detect the temperature, air pressure and methane concentration at the chimney respectively. These detection data have a great impact on the safety of the overall equipment and the environment, and can allow the staff to observe in more detail whether the gasifier is working normally and whether there are some safety hazards. It can also be said that they are indispensable components in the design.

[0028] In summary, the present invention provides a structure for collecting and distributing liquid pipes to prevent bias flow in a cryogenic medium heat exchanger. By adding a buffer pipe 3 to the outside of the liquid inlet pipe 2 and allowing the cryogenic liquid to enter the buffer pipe 3 from the bottom of the liquid inlet pipe 2 first, the liquid level rises and finally overflows into the heat exchange tube 4, so that the cryogenic liquid can evenly enter multiple heat exchange tubes 4, greatly reducing the possibility of bias flow in the heat exchange tube 4, solving the problem of serious bias flow in the existing structural design, and ensuring sufficient heat exchange efficiency. According to multiple experimental data, the bias flow of the previous direct-connected heat exchanger was as high as 15% to 22%, while the bias flow in this design is only 2% to 5%.

[0029] In terms of heat exchange effect, compared with the original structure, this technical solution can achieve better heat exchange effect, and at the same time has higher requirements for precision. The heat exchange area of ​​a single tube is smaller than the sum of the outer cross-sections of the capillary heat exchange tubes. In terms of application, this technical solution can also be well applied to the use scenarios of cryogenic liquid greater than or equal to 20,000 cubic meters, with good overall effect, wide applicability and high stability.

[0030] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid collecting and distributing pipe structure for preventing biased flow of a cryogenic medium heat exchanger, comprising a heat exchanger body (1), characterized in that: The heat exchanger body (1) is provided with a liquid inlet pipe (2), the liquid inlet pipe (2) being connected to an external pipe, a buffer pipe (3) being provided on the outside of the liquid inlet pipe (2), a plurality of flow holes (21) being evenly provided on the bottom of the liquid inlet pipe (2), the buffer pipe (3) being connected to the liquid inlet pipe (2) through the flow holes (21), and a heat exchange pipe (4) being further provided in the heat exchanger body (1), a plurality of pipe holes (31) being evenly provided on the top of the buffer pipe (3), the heat exchange pipe (4) being connected to the buffer pipe (3) through the flow holes (21). The buffer tube (3) is connected to the pipeline hole (31); a voltage stabilizing plate (41) is further arranged in the buffer tube (3), and the voltage stabilizing plate (41) is close to the pipeline hole (31); the voltage stabilizing plate (41) is installed on the buffer tube (3) through a fixing column (42), and there are two fixing columns (42) which are symmetrically arranged on both sides of the voltage stabilizing plate (41); the liquid inlet pipe (2) is connected to a flow guide pipe (5), and the flow guide pipe (5) passes through the buffer tube (3) and is connected to the external pipeline, and the cross-sectional diameter of the flow guide pipe (5) is smaller than the cross-sectional diameter of the liquid inlet pipe (2).

2. The structure of the liquid collecting and distributing pipe for preventing biased flow of a cryogenic medium heat exchanger according to claim 1, characterized in that: The flow hole (21) is vertically opened at the bottom of the liquid inlet pipe (2).

3. The structure of the liquid collecting and distributing pipe for preventing biased flow of a cryogenic medium heat exchanger according to claim 1, characterized in that: The sum of the opening cross-sectional areas of the plurality of flow holes (21) is greater than the cross-sectional area of ​​the liquid inlet pipe (2).

4. The structure of the liquid collecting and distributing pipe for preventing biased flow of a cryogenic medium heat exchanger according to claim 1, characterized in that: The flow guide pipe (5) is provided with a liquid inlet valve (51).

5. The structure of the liquid collecting and distributing pipe for preventing biased flow of a cryogenic medium heat exchanger according to claim 1, characterized in that: Water (11) is arranged in the heat exchanger body (1), and the buffer tube (3) is arranged at the bottom of the heat exchanger body (1) and immersed in the water (11).

6. The structure of the liquid collecting and distributing pipe for preventing biased flow of a cryogenic medium heat exchanger according to claim 1, characterized in that: A temperature detector (12), a pressure sensor (13) and a methane concentration detector (14) are arranged outside the heat exchanger body (1).

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