Anti-blocking heat exchanger for LNG cold box

Abstract

The anti-blocking heat exchanger for the LNG cold box comprises a box body, the middle portions of the upper end and the lower end of the box body are respectively provided with a quick dismounting mechanism, a disc, round holes, threaded holes and a rubber ring, pipe bundles are jointly arranged in the multiple round holes which correspond to each other up and down respectively, and threaded pipes corresponding to the threaded holes are arranged in the multiple threaded holes respectively. Filter plates are further arranged at the upper end and the lower end of the box body, and a cleaning mechanism is further arranged in the box body. According to the anti-blocking heat exchanger for the LNG cold box, the heat exchanger can be subjected to anti-blocking treatment, and the single tube bundle can be quickly replaced when the tube bundle is seriously blocked, so that the overall using effect and the overall using efficiency of the device are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of anti-blocking heat exchange equipment for LNG cold boxes, in particular to an anti-blocking heat exchanger for LNG cold boxes. Background Art

[0002] Cold box is the core equipment of LNG production. The raw gas is gradually cooled to -160℃~-155℃ through multiple groups of heat exchangers in the cold box, and basically liquefied. In actual production, although the raw gas is eluted to improve its purity, it is inevitable that there are substances such as water, carbon dioxide, and heavy hydrocarbons in the raw gas. During the production, processing or transportation of LNG, if the heat exchange medium contains impurities such as solid particles, welding slag, silt, and rubble, these impurities may enter the small channels inside the heat exchanger, causing them to gradually accumulate and eventually clog, or the low temperature environment in the LNG cold box may cause the solubility of some inorganic salts to decrease, thereby precipitating and forming crystals, such as methane hydrates and other heavy carbonates, sulfates, etc. These substances will form a hard scaling layer on the wall of the heat exchanger tube, affecting the heat transfer effect and fluid flow. The existing heat exchanger cannot clean the dirt on the heat exchange tube when preventing clogging, and the stains are easy to clog the inside of the heat exchange tube. In serious cases, the tube bundle needs to be replaced.

[0003] For example, the utility model with announcement number CN214470263U discloses an anti-blocking heat exchanger for LNG cold box. The technical solution of this patent includes: plate bundle, upper and lower envelopes, and left and right envelopes. Among them, the fins in the plate bundle are corrugated plates, the upper envelope has an elastic holding structure connected to the top of the plate bundle, and the lower envelope is provided with a telescopic structure connected to the bottom of the plate bundle; under the action of the elastic holding structure and the telescopic structure, the corrugation curvature of the fin changes, causing the plate bundle to deform along the Z axis. During use, this device uses the physical properties of the material to prevent blocking, but when dirt accumulates on the tube bundle, the device will not be able to remove the dirt, and when the dirt inside the tube bundle accumulates too much, the tube bundle cannot be replaced alone. Therefore, an anti-blocking heat exchanger for LNG cold box is proposed. Utility Model Content

[0004] In view of this, the utility model aims at the deficiencies of the prior art and provides an anti-clogging heat exchanger for an LNG cold box, which can not only prevent the heat exchanger from being blocked, but also quickly replace a single tube bundle when the tube bundle is seriously blocked, thereby improving the overall use effect and overall efficiency of the device.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: an anti-blocking heat exchanger for an LNG cold box, including a box body, and a quick disassembly mechanism is respectively arranged in the middle of the upper and lower ends of the box body, the quick disassembly mechanism includes discs respectively arranged at the upper and lower ends inside the box body, and a plurality of circular holes corresponding to each other are respectively arranged on the two discs, and threaded holes corresponding to the plurality of circular holes are respectively arranged at the outer ends of the two discs, and rubber rings are respectively arranged at the inner ends of the plurality of threaded holes, and tube bundles are respectively arranged inside the corresponding plurality of circular holes above and below, and threaded tubes corresponding to the plurality of threaded holes are respectively arranged inside the plurality of threaded holes, and filter plates are also arranged at the upper and lower ends of the box body, and a cleaning mechanism is also arranged inside the box body.

[0006] As a further improvement of the utility model, the cleaning mechanism includes two support plates arranged inside the box body and connected to the box body, the two support plates are welded to the box body, fixing rods are arranged on the two support plates close to the box body, screws are arranged on the two support plates away from the box body, a slider is arranged on the screw body, screw holes corresponding to the screws are arranged on the slider, and through holes corresponding to the fixing rods are arranged on the slider, a ring is arranged at one end of the slider away from the box body, a plurality of bristles are arranged inside the ring, an upper cylinder is arranged at the upper end of the box body, and a rotating motor corresponding to the screw is arranged on the upper cylinder.

[0007] As a further improvement of the utility model, an upper end cover is provided at the top of the upper cylinder, an internal outlet is provided at the top of the upper end cover, a lower cylinder is provided at the lower end of the box body, a lower tube plate is provided at the bottom of the lower cylinder, a lower end cover is provided at the bottom of the lower tube plate, an internal inlet is provided at the bottom of the lower end cover, a shell outlet is provided at the top side end of the box body, a shell inlet is provided at the lower side end of the box body, a switch is provided at the top of the upper cylinder, the switch is electrically connected to the rotating motor, and a connecting plate is provided in the middle of the box body.

[0008] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0009] First, when the tube bundle is seriously clogged by dirt, the tube bundle needs to be replaced. At this time, the threaded pipe is rotated, and the pressure of the rubber ring is released. At this time, the restraining force of the tube bundle is relaxed. At this time, the tube bundle with serious dirt can be taken out, and then a new tube bundle can be replaced. At this time, the tube bundle is inserted into the round hole, and the threaded pipe is screwed in to tighten the rubber ring, so that the tube bundle can be fixed.

[0010] Secondly, start the rotating motor. The starting of the rotating motor drives the lead screw to rotate. The rotation of the lead screw drives the slider arranged on the lead screw to move along the fixed rod, thereby driving the ring to move. The movement of the ring drives the bristles arranged inside the ring to move, thereby cleaning the dirt on the outside of the tube bundle, thereby preventing the heat exchanger from being blocked.

[0011] Third, the filter plate prevents external dirt from entering the interior of the tube bundle.

[0012] Fourthly, the upper end cover and the lower end cover are set to be spherical so as to increase the overall stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0016] Figure 3 It is a schematic diagram of the enlarged partial structure of point A of the utility model;

[0017] Figure 4 It is a schematic diagram of the enlarged partial structure of point B of the utility model.

[0018] In the figure: 101, box body; 102, support plate; 103, fixing rod; 104, screw; 105, slider; 106, ring; 107, bristles; 108, disc; 109, round hole; 110, threaded hole; 111, rubber ring; 112, tube bundle; 113, threaded tube; 114, filter plate; 115, upper cylinder; 116, rotating motor; 117, upper end cover; 118, internal outlet; 119, shell outlet; 120, shell inlet; 201, lower cylinder; 202, lower tube plate; 203, lower end cover; 204, internal inlet; 205, switch; 206, connecting plate. DETAILED DESCRIPTION

[0019] In order to better understand the present invention, the content of the present invention is further clearly described below in conjunction with the embodiments, but the protection content of the present invention is not limited to the following embodiments. In the following description, a large number of specific details are given in order to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details.

[0020] like Figure 1 , 2As shown in Figure 3, the anti-blocking heat exchanger for LNG cold box includes a box body 101, and quick disassembly mechanisms are respectively provided in the middle of the upper and lower ends of the box body 101. The quick disassembly mechanism includes discs 108 respectively arranged at the upper and lower ends of the box body 101, and a plurality of circular holes 109 corresponding to each other are respectively arranged on the two discs 108. The outer ends of the two discs 108 are respectively provided with threaded holes 110 corresponding to the plurality of circular holes 109, and the inner ends of the plurality of threaded holes 110 are respectively provided with rubber rings 111. The interiors of the plurality of corresponding circular holes 109 are respectively provided with tube bundles 112, and the interiors of the plurality of threaded holes 110 are respectively provided with corresponding threaded tubes 113. Filter plates 114 are also provided at the upper and lower ends of the box body 101, and a cleaning mechanism is also provided inside the box body 101.

[0021] like Figure 1 , 2 As shown in , 4, the cleaning mechanism includes two support plates 102 arranged inside the box body 101 and connected to the box body 101, the two support plates 102 are welded to the box body 101, a fixing rod 103 is arranged on the two support plates 102 close to the box body 101, a lead screw 104 is arranged on the two support plates 102 away from the box body 101, a slider 105 is arranged on the lead screw 104, the slider 105 is provided with a screw hole corresponding to the lead screw 104, the slider 105 is also provided with a through hole corresponding to the fixing rod 103, a ring 106 is arranged at one end of the slider 105 away from the box body 101, a plurality of bristles 107 are arranged inside the ring 106, an upper cylinder 115 is arranged at the upper end of the box body 101, and a rotating motor 116 corresponding to the lead screw 104 is arranged on the upper cylinder 115.

[0022] like Figure 1 As shown, an upper end cover 117 is provided at the top of the upper cylinder 115, an internal outlet 118 is provided at the top of the upper end cover 117, a lower cylinder 201 is provided at the lower end of the box body 101, a lower tube plate 202 is provided at the bottom of the lower cylinder 201, a lower end cover 203 is provided at the bottom of the lower tube plate 202, an internal inlet 204 is provided at the bottom of the lower end cover 203, a shell outlet 119 is provided at the top side end of the box body 101, a shell inlet 120 is provided at the lower side end of the box body 101, a switch 205 is provided at the top of the upper cylinder 115, the switch 205 is electrically connected to the rotating motor 116, and a connecting plate 206 is provided in the middle of the box body 101.

[0023] The user can first see that when the tube bundle 112 is seriously clogged with dirt, the tube bundle 112 needs to be replaced. At this time, the threaded tube 113 is rotated, and the pressure of the rubber ring 111 is released. At this time, the restraining force of the tube bundle 112 is relaxed, and the tube bundle 112 with serious dirt can be taken out, and then a new tube bundle 112 is replaced. At this time, the tube bundle 112 is inserted into the round hole 109, and the threaded tube 113 is screwed in to tighten the rubber ring 111, so that the tube bundle 112 can be fixed.

[0024] Start the rotating motor 116. The starting of the rotating motor 116 drives the screw 104 to rotate. The rotation of the screw 104 drives the slider 105 set on the screw 104 to move along the fixed rod 103, thereby driving the ring 106 to move. The movement of the ring 106 drives the bristles 107 set inside the ring 106 to move, thereby cleaning the dirt on the outside of the tube bundle 112, thereby preventing the heat exchanger from being blocked. The setting of the filter plate 114 prevents external dirt from entering the interior of the tube bundle 112. The upper end cover 117 and the lower end cover 203 are set to a spherical shape to increase the overall stability of the device.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. An anti-blocking heat exchanger for an LNG cold box, comprising a box body (101), characterized in that: The middle of the upper and lower ends of the box body (101) are respectively provided with a quick disassembly mechanism, and the quick disassembly mechanism comprises a disc (108) respectively provided at the upper and lower ends inside the box body (101), a plurality of circular holes (109) corresponding to each other are respectively provided on the two discs (108), threaded holes (110) corresponding to the plurality of circular holes (109) are respectively provided at the outer ends of the two discs (108), rubber rings (111) are respectively provided at the inner ends of the plurality of threaded holes (110), tube bundles (112) are respectively provided inside the corresponding plurality of circular holes (109), and threaded tubes (113) corresponding to the plurality of threaded holes (110) are respectively provided inside the plurality of threaded holes (110), filter plates (114) are further provided at the upper and lower ends of the box body (101), and a cleaning mechanism is further provided inside the box body (101).

2. The anti-blocking heat exchanger for the LNG cold box according to claim 1, characterized in that: The cleaning mechanism comprises two support plates (102) arranged inside the box body (101) and connected to the box body (101), a fixing rod (103) being arranged on the two support plates (102) close to the box body (101), a lead screw (104) being arranged on the two support plates (102) away from the box body (101), a slider (105) being arranged on the lead screw (104), a screw hole corresponding to the lead screw (104) being arranged on the slider (105), and a through hole corresponding to the fixing rod (103) being arranged on the slider (105), a circular ring (106) being arranged at one end of the slider (105) away from the box body (101), a plurality of bristles (107) being arranged inside the circular ring (106), an upper cylinder (115) being arranged at the upper end of the box body (101), and a rotating motor (116) corresponding to the lead screw (104) being arranged on the upper cylinder (115).

3. The anti-blocking heat exchanger for the LNG cold box according to claim 2, characterized in that: An upper end cover (117) is provided at the top of the upper cylinder (115), and an internal outlet (118) is provided at the top of the upper end cover (117).

4. The anti-blocking heat exchanger for the LNG cold box according to claim 3, characterized in that: A lower cylinder (201) is provided at the lower end of the box body (101), and a lower tube plate (202) is provided at the bottom of the lower cylinder (201).

5. The anti-blocking heat exchanger for the LNG cold box according to claim 4, characterized in that: A lower end cover (203) is provided at the bottom of the lower tube plate (202), and an internal inlet (204) is provided at the bottom of the lower end cover (203).

6. The anti-blocking heat exchanger for the LNG cold box according to claim 5, characterized in that: The top side end of the box body (101) is provided with a shell outlet (119), and the lower side end of the box body (101) is provided with a shell inlet (120).

7. The anti-blocking heat exchanger for the LNG cold box according to claim 6, characterized in that: A switch (205) is provided on the top of the upper cylinder (115), and a connecting plate (206) is provided in the middle of the box (101).

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