Middle tube flow increase buffer type combined flow channel spiral plate heat exchanger

Abstract

The present invention provides a middle-tube flow-increasing and buffering type combined flow channel spiral plate heat exchanger, which belongs to the field of spiral plate heat exchangers. The equipment includes a middle-tube flow-increasing and buffering type spiral body, and the two ends of the middle-tube flow-increasing and buffering type spiral body are detachably connected to a cover plate and a hemispherical flow-increasing and buffering head through a concave-convex sealing flange structure; a hot side medium outlet is arranged on the outer side of the cover plate, and a tangential hot side medium inlet is arranged on the upper part of the middle-tube flow-increasing and buffering type spiral body, and a cold side medium outlet is arranged on the top of the hemispherical flow-increasing and buffering head, and a cold side medium inlet is arranged on the bottom; a head partition is arranged inside the hemispherical flow-increasing and buffering head, and the middle-tube flow-increasing and buffering type spiral body includes an outer ring cylinder body, a middle spiral plate, an inner ring middle-tube core tube, and a middle-tube partition is arranged in the middle of the middle-tube core tube. The present invention enhances the heat exchange efficiency of the medium and increases the medium processing flow rate; the detachable concave-convex sealing flange structure has good sealing performance, is convenient for installation, regular maintenance, cleaning and maintenance, and prevents the leakage of harmful substances from polluting the environment or causing personnel poisoning.

Description

Technical Field

[0001] The invention belongs to the field of spiral plate heat exchangers, and in particular relates to a middle-tube flow-increasing and buffering type combined flow channel spiral plate heat exchanger. Background Art

[0002] Different heat exchanger groups (spiral plate heat exchanger, plate heat exchanger, tubular heat exchanger, shell and tube heat exchanger, etc.) form a heat exchanger network as an important subsystem in the process control system. The level of design and the advancement of manufacturing technology have an important impact on the energy consumption and economy of the process system. Therefore, the comprehensive optimization of the heat exchange network has become a hot issue in research and manufacturing. Among the many comprehensive research and development of heat exchange networks, the innovation of the spiral plate heat exchanger structure is imperative.

[0003] Spiral plate heat exchanger is a type of heat exchanger. Spiral plate heat exchanger has a wide variety of varieties and a wide range of uses. Spiral plate heat exchanger can achieve heat exchange between two gas or liquid media with a certain temperature difference, thereby reducing (or increasing) the temperature and recycling it. It is a key equipment to ensure the normal operation of the heat exchange network system. The enhanced heat transfer, reduced flow resistance and improved comprehensive performance of spiral plate condensers have always been a hot topic for domestic scientific researchers and engineering technicians. However, the supply capacity and technical level of domestic enterprises are limited, resulting in the spiral plate condenser industry showing a market state where the high-end market relies on imports and is in short supply. The comprehensive performance of many domestic spiral plate condenser products is relatively poor, the flow channel is prone to scaling and clogging, and needs to be cleaned and maintained after a certain period of use (half a year to a year), which directly affects the effective operation of the heat exchange network.

[0004] The spiral body in the current spiral plate heat exchanger has a single-channel medium (fluid) flow, which has problems such as unstable medium flow, pressure drop loss, reduced heat exchange efficiency, and the need to improve fluid flow. Summary of the invention

[0005] The purpose of the present invention is to provide a middle-tube flow-increasing buffer type combined flow channel spiral plate heat exchanger, which can increase the flow rate of heat exchange medium (fluid), reduce the inlet and outlet temperature difference, stabilize the heat exchange temperature required with the other side medium, and improve the heat exchange efficiency of the equipment.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The middle cylinder flow-increasing and buffering type combined flow channel spiral plate heat exchanger comprises a middle cylinder flow-increasing and buffering type spiral body, the two ends of which are detachably connected to a cover plate and a hemispherical flow-increasing and buffering head through concave-convex sealing flange structures respectively; a hot side medium outlet is arranged on the outer side of the cover plate, a tangential hot side medium inlet is arranged on the upper part of the middle cylinder flow-increasing and buffering spiral body, and a cold side medium outlet is arranged on the top of the hemispherical flow-increasing and buffering head, and a cold side medium inlet is arranged on the bottom;

[0008] A head partition is provided inside the hemispherical flow-increasing buffer head, and the head partition divides the inner cavity of the hemispherical flow-increasing buffer head into two upper and lower buffer compartments;

[0009] The middle cylinder flow-increasing buffer spiral body comprises an outer cylinder body, a middle spiral plate, and an inner middle cylinder core tube. A middle cylinder partition is provided in the middle of the middle cylinder core tube to divide the interior of the middle cylinder core tube into two upper and lower buffer flow channels. One end of the two spiral plates is connected to the middle cylinder, and the other end is spirally rolled to form a hot side closed spiral channel and a cold side axial through channel. Both ends of one of the spiral plates forming the hot side closed spiral channel are mechanically flanged and welded to the other spiral plate to form a sealed channel.

[0010] The hot side medium inlet is connected with the upper buffer channel of the middle cylinder core tube through the hot side closed spiral channel, and the upper buffer channel of the middle cylinder core tube is connected with the hot side medium outlet; the cold side medium inlet is connected with the cold side axial through channel and the lower buffer channel of the middle cylinder core tube respectively through the lower buffer chamber of the hemispherical flow increase buffer head, the lower buffer channel of the middle cylinder core tube is connected with the cold side axial through channel, and the cold side axial through channel is connected with the cold side medium outlet through the upper buffer chamber of the hemispherical flow increase buffer head.

[0011] Furthermore, the concave-convex sealing flange structure includes a first end face flange and a second end face flange. A convex sealing ring is fixedly provided on the first end face flange, and a concave sealing ring matching the convex sealing ring is fixedly provided on the second end face flange. The first end face flange and the second end face flange are also provided with threaded holes, and the first end face flange and the second end face flange are fastened and connected by bolts passing through the threaded holes.

[0012] Preferably, a sealing gasket is provided between the convex sealing liner ring and the concave sealing liner ring.

[0013] Preferably, distance columns are set in both the hot-side closed spiral channel and the cold-side axial through channel. The distance columns in the cold-side axial through channel are rectangular and arranged with large spacing along the width direction of the spiral plate, while the distance columns in the hot-side closed spiral channel are arranged in a staggered matrix.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The traditional structure of the spiral heat exchanger has no flow distribution middle cylinder in the middle, and the spiral can be directly rolled and welded in the center. The medium flow is fixed and cannot be adjusted, and the heat exchange efficiency is poor. The present invention's spiral plate heat exchanger with combined flow channel and flow increase buffer type has a lower buffer channel on the middle cylinder core tube and a hemispherical flow increase buffer head to form a flow increase buffer cabin. The cold side medium in the cold side axial through channel can simultaneously have multiple layers of axial flow and multiple layers of spiral flow, which solves the problems of unstable flow rate, pressure drop loss, and reduced heat exchange efficiency of the spiral medium in the existing spiral plate heat exchanger. The cold side medium enters the lower buffer channel on the middle cylinder core tube and the cold side axial through channel from the lower buffer cabin of the hemispherical flow increase buffer head for distribution, and circulates through the multiple simultaneous axial flow and multiple simultaneous spiral flow channels, and then enters the upper buffer of the hemispherical flow increase buffer head. The compartment buffers outflow. Since the cold side medium stock of the flow-increasing buffer compartment composed of the buffer flow channel on the lower side of the middle tube core tube and the hemispherical flow-increasing buffer head is relatively large, the time from the inlet to the outlet is shortened, and the buffer distribution to the multi-layer simultaneous axial flow and the multi-layer simultaneous spiral flow is uniform. A sufficient amount of cold side medium increases the temperature difference with the hot side medium on the other side being heat exchanged, thereby prompting the temperature and pressure of the cold side medium to reach a balanced and stable state, so that the heat exchange efficiency is enhanced, and the temperature and pressure of the sufficient medium (fluid) are easy to adjust; it solves the drawback of the existing spiral plate heat exchanger single-channel medium (fluid) circulation limitation, effectively strengthens the flow of the refrigerant fluid medium in the spiral channel, stabilizes the exchange of the temperature required for the heat exchange medium (fluid), improves the heat exchange performance of the equipment, and can effectively increase the medium (fluid) processing flow.

[0016] 2. The cylindrical flow-increasing and buffering combined flow channel spiral plate heat exchanger of the present invention adopts a detachable concave-convex sealing flange structure, which is convenient for installation, regular maintenance, cleaning and maintenance.

[0017] 3. The cylindrical flow-increasing buffer type combined flow channel spiral plate heat exchanger of the present invention has a scientific layout of fixed-distance column array, wide channel design and manufacturing, large fluid, stable flow rate, small pressure drop, and improved condensation efficiency.

[0018] 4. The detachable concave-convex sealing flange structure of the present invention has good sealing performance, which solves the problem of leakage of highly toxic, flammable, explosive or precious fluid media (products) in existing spiral plate heat exchangers, and prevents the leakage of harmful substances from polluting the environment or causing human poisoning.

[0019] 5. The cylindrical flow-increasing buffer type combined flow channel spiral plate heat exchanger of the present invention is not restricted by the fluid circulation of the traditional single-flow channel spiral plate heat exchanger, and can achieve heat exchange with a small temperature difference below 5°C.

[0020] 6. The traditional structure of the spiral heat exchanger port is a flat cover plate without a hemispherical shape or the spiral channel is directly welded without an end cover plate. Although it saves materials, the pressure bearing capacity is not high. Some equipment is appropriately made into a hemisphere for the sake of appearance, but no fluid flows inside. The present invention adopts a hemispherical flow-increasing buffer head with high pressure bearing capacity and a concave-convex seal on the pressure-bearing end face. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the middle-tube flow-increasing and buffering combined flow channel spiral plate heat exchanger of the present invention;

[0022] Figure 2 It is an internal schematic diagram of the middle-tube flow-increasing and buffering combined flow channel spiral plate heat exchanger of the present invention;

[0023] Figure 3 It is an enlarged view of the core tube of the middle tube of the present invention;

[0024] Figure 4 It is a structural schematic diagram of the concave-convex sealing flange in the present invention;

[0025] Markings in the figure: 1-cover plate, 2-middle cylinder flow-increasing and buffering spiral body, 201-cylinder body, 202-spiral plate, 203-middle cylinder core tube, 204-hot side closed spiral channel, 205-cold side axial through channel, 206-middle cylinder partition, 3-hemispherical flow-increasing and buffering head, 301-head outer cylinder, 302-head partition, 4-hot side medium inlet, 5-hot side medium outlet, 6-cold side medium inlet, 7-cold side medium outlet, 8-first end face flange, 801-convex sealing liner ring, 9-second end face flange, 901-concave sealing liner ring, 10-sealing gasket, 11-threaded hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Example

[0027] Please see attached Figure 1-4As shown, the middle cylinder flow-increasing and buffering combined flow channel spiral plate 202 heat exchanger of this embodiment comprises a middle cylinder flow-increasing and buffering spiral body 2, and the two ends of the middle cylinder flow-increasing and buffering spiral body 2 are detachably connected to a cover plate 1 and a hemispherical flow-increasing and buffering head 3 through concave-convex sealing flange structures respectively; a hot side medium outlet 5 is arranged on the outer side of the cover plate 1, a tangential hot side medium inlet 4 is arranged on the upper part of the middle cylinder flow-increasing and buffering spiral body 2, a cold side medium outlet 7 is arranged on the top of the hemispherical flow-increasing and buffering head 3, and a cold side medium inlet 6 is arranged on the bottom; a head partition 302 is arranged inside the hemispherical flow-increasing and buffering head 3, and the head partition 302 divides the inner cavity of the hemispherical flow-increasing and buffering head 3 into two upper and lower buffer compartments in proportion; the middle cylinder flow-increasing and buffering spiral body 2 comprises an outer ring cylinder body 201, a middle spiral plate 202, and an inner ring middle cylinder core tube 203, and a middle of the middle cylinder core tube 203 is provided with a The middle cylinder partition 206, one end of the two spiral plates 202 is connected to the middle cylinder, and the other end is spirally rolled to form a hot side closed spiral channel 204 and a cold side axial through channel 205. Both ends of one of the spiral plates 202 forming the hot side closed spiral channel 204 are mechanically flanged and welded to the other spiral plate 202 to form a sealed channel; the hot side medium inlet 4 is connected to the upper buffer channel of the middle cylinder core tube 203 through the hot side closed spiral channel 204, and the upper buffer channel of the middle cylinder core tube 203 is connected to the hot side medium outlet 5; the cold side medium inlet 6 is connected to the cold side axial through channel 205 and the lower buffer channel of the middle cylinder core tube 203 through the lower buffer chamber of the hemispherical flow increase buffer head 3, respectively, the lower buffer channel of the middle cylinder core tube 203 is connected to the cold side axial through channel 205, and the cold side axial through channel 205 is connected to the cold side medium outlet 7 through the upper buffer chamber of the hemispherical flow increase buffer head 3.

[0028] Specifically, the concave-convex sealing flange structure includes a first end face flange 8 and a second end face flange 9. A convex sealing ring 801 is fixedly provided on the first end face flange 8, and a concave sealing ring 901 matching the convex sealing ring 801 is fixedly provided on the second end face flange 9. The first end face flange 8 and the second end face flange 9 are also provided with threaded holes 11, and the first end face flange 8 and the second end face flange 9 are fastened and connected by bolts passing through the threaded holes 11.

[0029] In this embodiment, a first end face flange 8 is provided on the right end face of the cover plate 1, and a second end face flange 9 is correspondingly provided on the left end face of the middle cylinder flow-increasing and buffering spiral body 2; a first end face flange 8 is provided on the right end face of the middle cylinder flow-increasing and buffering spiral body 2, and a second end face flange 9 is correspondingly provided on the left end face of the hemispherical flow-increasing and buffering head 3.

[0030] In this embodiment, through holes are arranged on the lower buffer flow channel and the upper buffer flow channel of the middle tube core tube 203, so that the lower buffer flow channel and the upper buffer flow channel of the middle tube core tube 203 are connected with the cold side axial through channel 205 and the hot side closed spiral channel 204 respectively.

[0031] In this embodiment, the lower buffer channel of the middle tube core tube 203 and the hemispherical flow-increasing buffer head 3 form a flow-increasing buffer chamber, and the cold side medium in the cold side axial through channel 205 can simultaneously flow in multiple layers of axial flow and multiple layers of spiral flow. The cold side medium enters the lower buffer channel of the middle tube core tube 203 and the cold side axial through channel 205 from the lower buffer chamber of the hemispherical flow-increasing buffer head 3 for distribution, and flows out from the upper buffer chamber of the hemispherical flow-increasing buffer head 3 after circulating through the multiple layers of simultaneous axial flow and multiple layers of simultaneous spiral flow channels. Since the cold side medium inventory in the flow-increasing buffer chamber composed of the lower buffer channel of the middle tube core tube 203 and the hemispherical flow-increasing buffer head 3 is relatively large, the time from the inlet to the outlet is shortened, and the flow rate of the multiple layers of simultaneous axial flow and multiple layers of simultaneous spiral flow is uniformly distributed to the buffer, and a sufficient amount of cold side medium increases the temperature difference with the hot side medium on the other side being heat exchanged, thereby promoting the temperature and pressure of the cold side medium to reach a balanced and stable state, so that the heat exchange efficiency is enhanced, and the temperature and pressure of the sufficient medium (fluid) are easy to adjust. The hot side medium enters the hot side closed spiral channel 204 tangentially from the hot side medium inlet 4 , flows spirally from outside to inside, and flows out from the hot side medium outlet 5 after reaching the buffer flow channel on the upper side of the middle cylinder core tube 203 .

[0032] Specifically, a sealing gasket 10 is further provided between the convex sealing liner ring 801 and the concave sealing liner ring 901 .

[0033] In this embodiment, the sealing gasket 10 is a high-viscosity polymer sealing ring.

[0034] In this embodiment, a detachable concave-convex sealing flange structure is adopted. The structure is a concave-convex end face seal plus a high-viscosity polymer sealing ring and bolt fastening structure, and has good sealing performance.

[0035] Specifically, distance columns are set in both the hot-side closed spiral channel 204 and the cold-side axial through channel 205. The distance columns in the cold-side axial through channel 205 are rectangular and arranged with large spacing along the width direction of the spiral plate 202, while the distance column matrix in the hot-side closed spiral channel 204 is staggered.

[0036] In this embodiment, the distance column structure in the hot side closed spiral channel 204 is the same as the distance column structure used in the traditional spiral plate heat exchanger. Through the scientific layout of the distance column array, wide channel design and manufacturing, large fluid, stable flow rate, small pressure drop, the condensation efficiency is improved.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Middle tube flow increasing buffer type combined flow channel spiral plate heat exchanger, characterized by: It comprises a middle cylinder flow-increasing and buffering spiral body, and the two ends of the middle cylinder flow-increasing and buffering spiral body are detachably connected to a cover plate and a hemispherical flow-increasing and buffering head through concave-convex sealing flange structures respectively; a hot side medium outlet is arranged on the outer side of the cover plate, a tangential hot side medium inlet is arranged on the upper part of the middle cylinder flow-increasing and buffering spiral body, and a cold side medium outlet is arranged on the top of the hemispherical flow-increasing and buffering head, and a cold side medium inlet is arranged on the bottom; A head partition is provided inside the hemispherical flow-increasing buffer head, and the head partition divides the inner cavity of the hemispherical flow-increasing buffer head into two upper and lower buffer compartments; The middle cylinder flow-increasing buffer spiral body comprises an outer cylinder body, a middle spiral plate, and an inner middle cylinder core tube. A middle cylinder partition is provided in the middle of the middle cylinder core tube to divide the interior of the middle cylinder core tube into two upper and lower buffer flow channels. One end of the two spiral plates is connected to the middle cylinder, and the other end is spirally rolled to form a hot side closed spiral channel and a cold side axial through channel. Both ends of one of the spiral plates forming the hot side closed spiral channel are mechanically flanged and welded to the other spiral plate to form a sealed channel. The hot side medium inlet is connected with the buffer flow channel on the upper side of the middle tube core tube through the hot side closed spiral channel, and the buffer flow channel on the upper side of the middle tube core tube is connected with the hot side medium outlet; the cold side medium inlet is connected with the cold side axial through-channel and the buffer flow channel on the lower side of the middle tube core tube through the buffer chamber on the lower side of the hemispherical flow increase buffer head, respectively, the buffer flow channel on the lower side of the middle tube core tube is connected with the cold side axial through-channel, and the cold side axial through-channel is connected with the cold side medium outlet through the buffer chamber on the upper side of the hemispherical flow increase buffer head; The concave-convex sealing flange structure includes a first end face flange and a second end face flange. A convex sealing ring is fixedly arranged on the first end face flange, and a concave sealing ring matching the convex sealing ring is fixedly arranged on the second end face flange. Both the first end face flange and the second end face flange are also provided with threaded holes. The first end face flange and the second end face flange are fastened and connected by bolts passing through the threaded holes. A sealing gasket is also provided between the convex sealing ring and the concave sealing ring.

2. The middle-tube flow-increasing and buffering combined flow channel spiral plate heat exchanger according to claim 1 is characterized in that: Distance columns are set in both the hot-side closed spiral channel and the cold-side axial through channel. The distance columns in the cold-side axial through channel are rectangular and arranged with large spacing along the width direction of the spiral plate, while the distance columns in the hot-side closed spiral channel are arranged in a staggered matrix.

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