Defrosting device for LNG (Liquefied Natural Gas) air temperature vaporizer

Abstract

The utility model belongs to the technical field of liquefied natural gas application, and particularly relates to a defrosting device of an LNG air temperature gasifier. Comprising defrosting pipes arranged on the two sides of the air temperature vaporizer, an air inlet pipe is arranged at one end of each defrosting pipe, a transverse pipe is further arranged below the defrosting pipes, the transverse pipes are arranged between the two defrosting pipes, the transverse pipes are communicated with the defrosting pipes, the transverse pipes are arranged between the two defrosting pipes at intervals, and the transverse pipes are communicated with the defrosting pipes. A defrosting assembly is further arranged on the defrosting pipe and the transverse pipe and comprises a connecting pipe used for being communicated with the defrosting pipe or the transverse pipe and an arc-shaped pipe arranged at one end of the connecting pipe, the two ends of the arc-shaped pipe are connected with universal pipes, and the ends, away from the arc-shaped pipe, of the universal pipes are closed. And air outlet holes are formed in the arc-shaped pipe and the universal pipe. The LNG air temperature vaporizer is ingenious in structural design, can be conveniently installed on an existing LNG air temperature vaporizer, and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquefied natural gas application, and in particular relates to a defrosting device for an LNG air-temperature vaporizer. Background Art

[0002] LNG is the abbreviation of liquefied natural gas. During the transportation of natural gas, in order to facilitate transportation, natural gas needs to be liquefied at ultra-low temperature (-162℃) and normal pressure to form liquefied natural gas. The volume of liquefied natural gas is about 1 / 625 of the volume of the same amount of gaseous natural gas, which effectively improves the convenience of transportation and storage.

[0003] However, natural gas needs to be in gaseous form to be used. Therefore, liquefied natural gas needs to be gasified before use. At present, the vaporizers used in China are mainly divided into electric heating type, electric water bath type, hot water circulation type, and air temperature type. Among them, air temperature vaporizers are widely used because of their high efficiency, environmental protection, and energy saving.

[0004] The main body of the air-temperature vaporizer usually uses aluminum alloy finned tubes, which use ambient air as the heat source. It relies on its own sensible heat and absorbs the heat from the external atmospheric environment to achieve the vaporization function. It does not require additional energy and has a low operating cost. However, due to the influence of ambient temperature and humidity, the temperature is too low in winter, which will cause frost on the vaporizer. Frosting will have a series of adverse effects on the performance and normal operation of the air-temperature vaporizer (the vaporization volume may not reach the rated value). For this reason, the air-temperature vaporizer needs to be defrosted.

[0005] At present, most of the defrosting devices for air temperature vaporizers mainly use hot air to defrost the outer wall of the air temperature vaporizer. However, when defrosting, the water on the outer wall of the air temperature vaporizer is not wiped clean, so it is easy for frost to form on the surface of the air temperature vaporizer again, thereby affecting the normal operation of the vaporization pipe and reducing the working efficiency of the vaporization pipe. Utility Model Content

[0006] Aiming at the technical problems existing in the hot air defrosting of the existing LNG air temperature vaporizer, the utility model proposes an LNG air temperature vaporizer defrosting device which has reasonable design, simple structure, convenient processing and can effectively remove water on the vaporization pipe.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is as follows: the utility model provides an LNG air-temperature vaporizer defrost device, including defrost pipes arranged on both sides of the air-temperature vaporizer, one end of the defrost pipe is provided with an air inlet pipe, and a cross pipe is also provided below the defrost pipe, the cross pipe is arranged between the two defrost pipes, the cross pipe is connected to the defrost pipe, the cross pipe is arranged between the two defrost pipes at intervals, and a defrost assembly is also arranged on the defrost pipe and the cross pipe, the defrost assembly includes a connecting pipe for communicating with the defrost pipe or the cross pipe and an arc pipe arranged at one end of the connecting pipe, both ends of the arc pipe are connected with universal pipes, the universal pipe is closed at one end away from the arc pipe, and air outlets are provided on the arc pipe and the universal pipe.

[0008] Preferably, a quick-connect plug is provided at the bottom of the defrost pipe, and the quick-connect plug is connected to the defrost pipe. Quick-connect female sockets are provided at both ends of the cross pipe, and the cross pipe is detachably fixed under the defrost pipe through the cooperation of the quick-connect female sockets and the quick-connect plug.

[0009] Preferably, a screw nut is further provided on the outer side of the defrost pipe, a screw is sleeved inside the screw nut, and a driving motor is connected to the top of the screw.

[0010] Preferably, the lead screw nut is arranged in the middle of the defrost pipe, linear bearings are arranged on both sides of the lead screw nut, and a guide optical axis is mounted inside the linear bearing.

[0011] Compared with the prior art, the advantages and positive effects of the utility model are:

[0012] 1. The utility model provides a defrosting device for an LNG air-temperature vaporizer. By setting a defrosting pipe and a cross pipe, the defrosting assembly can be matched to each vaporizing pipe. At the same time, by utilizing the cooperation of the arc pipe and the universal pipe in the defrosting assembly, the entire device is not only convenient to be installed between the vaporizing pipes, but also can effectively remove water from the fin structure of the vaporizing pipe, thereby avoiding the occurrence of frost again. At the same time, the utility model has an ingenious structural design and is convenient to be installed on the existing LNG air-temperature vaporizer, and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0014] Figure 1 A schematic diagram of the structure of the LNG air temperature vaporizer defrosting device provided in Example 1;

[0015] Figure 2 A front view of the LNG air temperature vaporizer defrosting device provided in Example 1;

[0016] Figure 3 A schematic diagram of the structure of the defrost assembly provided in Example 1;

[0017] In the above figures, 1. defrost pipe; 11. air inlet pipe; 12. lead screw nut; 13. linear bearing; 14. quick-connect plug; 2. cross pipe; 3. defrost assembly; 31. connecting pipe; 32. arc pipe; 33. universal pipe; 34. air outlet; 4. fixing bracket; 5. driving motor; 51. angle converter; 6. lead screw; 7. guide optical axis. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0020] Embodiment 1, as Figure 1 to Figure 3As shown, this embodiment aims to provide a defrosting device suitable for an existing installed LNG air temperature vaporizer to improve the defrosting effect. Considering that the existing LNG air temperature vaporizer mainly includes a plurality of vaporization tubes distributed in an array and arranged vertically, the vaporization tubes in the same column or row are arranged in series, heat exchange fins are distributed in an annular shape on the side wall of the vaporization tube, and retaining plates and retaining frames are arranged at the upper and lower ends of the vaporization tube. To this end, it is necessary to dehydrate the surface of the vaporization pipe, and this needs to be done for each vaporization pipe. Therefore, in order to achieve the above-mentioned purpose, the LNG air-temperature vaporizer defrosting device provided in this embodiment includes defrost pipes 1 arranged on both sides of the air-temperature vaporizer. The defrost pipes 1 need to be arranged on the outside of the air-temperature vaporizer, and an air inlet pipe 11 is arranged at one end of the defrost pipe 1. A cross pipe 2 is also arranged below the defrost pipe 1, and the cross pipe 2 is arranged between the two defrost pipes 1. In this embodiment, the cross pipe 2 is arranged below the defrost pipe 1 mainly for the convenience of installation. Since the air-temperature vaporizer has been formed, the cross pipe 2 needs to pass through the air-temperature vaporizer during installation. Therefore, in this embodiment, in order to simplify the installation procedure, a quick-connect plug 14 is arranged at the bottom of the defrost pipe 1, and the quick-connect plug 14 is connected to the defrost pipe 1. Quick-connect female seats are arranged at both ends of the cross pipe 2. The cross pipe 2 is detachably fixed below the defrost pipe 1 through the cooperation of the quick-connect female seat and the quick-connect plug 14. In this way, it is only necessary to insert the transverse pipe 2 through the air temperature vaporizer and then insert it into the quick-connect plug 14, which is quick and easy to install. In this way, the communication between the defrost pipe 1 and the transverse pipe 2 is realized. Of course, the transverse pipe 2 needs to be arranged between two defrost pipes 1, that is, the vaporization pipes are arranged in a group of two, and each group has a vaporization pipe.

[0021] Taking into account the need to flush out the moisture, in order to maintain the air pressure, in the present embodiment, air inlet pipes 11 are provided on the two defrost pipes 1, but the cross pipe 2 is not connected to both defrost pipes 1, but connected in an alternating manner. In this way, the pressure of the cross pipe 2 can be maintained to avoid excessive pressure drop at the end, which would affect the dewatering effect.

[0022] Considering that the presence of fins improves the efficiency of heat exchange, it also causes the problem of residual moisture. Therefore, it is necessary to dehydrate the fins of each vaporization tube. Therefore, in the present embodiment, a defrost assembly 3 is further provided on the defrost tube 1 and the cross tube 2. The defrost assembly 3 includes a connecting tube 31 for communicating with the defrost tube 1 or the cross tube 2 and an arc tube 32 arranged at one end of the connecting tube 31. In the present embodiment, the connecting tube 31 is fixed to the defrost tube 1 or the cross tube 2 by a threaded connection. The arc tube 32 is mainly provided to facilitate the subsequent bending of the universal tube 33. The universal tubes 33 are connected to both ends of the arc tube 32. In order to maintain pressure, the universal tube 33 is closed away from one end of the arc tube 32. At the same time, air outlet holes 34 are provided on both the arc tube 32 and the universal tube 33. The setting of the universal tube 33 is mainly due to the fact that the air-temperature vaporizer has been formed. In order to take into account all the fins, the best is a ring-shaped structure. The placement of the ring-shaped structure requires the removal of the retaining plate of the air-temperature vaporizer, which is more troublesome. The setting of the universal tube 33 can maintain a horizontal state or a large arc state during installation. After the installation is completed, it can be bent manually. Of course, it can only meet the bending width of the air-temperature vaporizer that is twice the length of a human arm. However, the width of most existing air-temperature vaporizers is about 1m (the width of YQK-100D is 934mm, and the width of YQK-400D is 1093mm). Therefore, the bending needs are fully met, so that the circumference of the vaporization tube can be effectively cleared.

[0023] Through the above arrangement, the installation and use of the defrosting device of the finished air-temperature vaporizer are effectively satisfied. Considering the high height of the air-temperature vaporizer, the defrosting pipe 1 can be arranged in upper and lower sections.

[0024] Similarly, considering that the height of the air temperature vaporizer is generally between 2m and 5m, the multi-stage defrost pipe 1 can meet the needs, but the air pressure requirement is higher. For this reason, in this embodiment, a screw 6 nut 12 is also provided on the outside of the defrost pipe 1, and a screw 6 is set inside the screw 6 nut 12. The top of the screw 6 is connected to the drive motor 5. In this embodiment, a fixing frame 4 is installed on the retaining frame at the top of the air temperature vaporizer, and the drive motor 5 is fixed on the fixing frame 4. The drive motor 5 adopts a bidirectional output shaft motor, and the end of the output shaft is connected to an angle commutator 51. The angle commutator 51 uses a bevel gear to achieve a 90-degree rotation angle conversion. In this way, the two screws 6 can be driven to rotate at the same time, and then the defrost pipe 1 is driven to rise and fall synchronously. In this way, the reciprocating motion of the defrost pipe 1 is used to remove frost and water. Of course, for an air temperature vaporizer with a high height and a retaining frame set in the middle, the defrost pipe 1 needs to be set according to the limit of the retaining frame.

[0025] In order to ensure the stability of the defrost pipe 1 in lifting and lowering, in this embodiment, the screw rod 6 and the nut 12 are arranged in the middle of the defrost pipe 1, and linear bearings 13 are arranged on both sides of the screw rod 6 and the nut 12, and the linear bearings 13 are sleeved with the guide light axis 7. In this way, the guide light axis 7 is used to maintain stability, thereby improving the stability of lifting and lowering.

[0026] Through the above arrangement, when hot air passes through the defrost pipe 1, defrosting and dehydration can be carried out simultaneously. If natural air passes through the defrost pipe 1, dehydration can be achieved. Considering that it is carried out in a low temperature environment, hot air is most suitable.

[0027] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A LNG air temperature vaporizer defrosting device, characterized in that: It includes defrost pipes arranged on both sides of the air temperature vaporizer, one end of the defrost pipe is provided with an air inlet pipe, a cross pipe is also provided below the defrost pipe, the cross pipe is arranged between the two defrost pipes, the cross pipe is connected to the defrost pipe, the cross pipe is arranged between the two defrost pipes, and a defrost assembly is also arranged on the defrost pipe and the cross pipe. The defrost assembly includes a connecting pipe for connecting with the defrost pipe or the cross pipe and an arc pipe arranged at one end of the connecting pipe, both ends of the arc pipe are connected with universal pipes, the universal pipe is closed at one end away from the arc pipe, and air outlets are provided on the arc pipe and the universal pipe.

2. The LNG air temperature vaporizer defrosting device according to claim 1, characterized in that: A quick-connect plug is provided at the bottom of the defrost pipe, and the quick-connect plug is connected to the defrost pipe. Quick-connect female sockets are provided at both ends of the cross pipe. The cross pipe is detachably fixed under the defrost pipe through the cooperation of the quick-connect female sockets and the quick-connect plug.

3. The LNG air temperature vaporizer defrosting device according to claim 2, characterized in that: A screw nut is also provided on the outside of the defrost pipe, a screw is sleeved inside the screw nut, and a driving motor is connected to the top of the screw.

4. The LNG air temperature vaporizer defrosting device according to claim 3, characterized in that: The screw nut is arranged in the middle of the defrost pipe, and linear bearings are arranged on both sides of the screw nut, and a guide optical axis is sleeved inside the linear bearing.

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