WO2014012514A1 - Heat exchanger - Google Patents

Description

 Heat exchanger

 The invention relates to a heat exchanger. Background technique

 The fouling problem is one of the most common problems in the operation of heat exchangers. It can lead to poor heat transfer efficiency, blockage of heat exchanger tubes, and local overheating damage of heat exchangers. In coal chemical and petrochemical plants, the fouling problem is particularly serious due to the viscous material, low flow rate and non-homogeneous nature of the material, which has become a bottleneck restricting efficient, stable, long-term and safe production.

 The cause of scale formation in the heat exchanger is closely related to the structure of the heat exchanger in addition to the physicochemical properties of the material itself. For example, in the traditional shell-and-tube heat exchanger, a bow-shaped and disc-shaped baffle plate is often used in the shell-side, and a flow "dead zone" exists at the joint between the baffle plate and the casing, which is easy to foul.

 Patent documents CN1719187A and CN1529113A disclose a spiral baffle, which is a continuous spiral and a discontinuous spiral composed of a plurality of curved sectors, which can eliminate the flow dead zone and reduce fouling. However, there is still a low flow rate area in the area where the spiral baffle meets the heat exchange tube, and there is still a problem of scaling, especially when the material passing through is a slurry material containing solid particles, such as coal water slurry, due to solid particles. Deposition is apt to occur, and solid particles also inhibit the formation of turbulence and are therefore more prone to severe fouling.

 Patent Document CN101799255A discloses a shell-and-tube heat exchanger in which an anti-fouling blade which can be reciprocated along a heat exchange tube is disposed in a shell side. The technical solution solves the scaling problem of the heat exchanger to some extent from another idea, but the fixed baffle plate remains in the heat exchanger, and the structure is complicated, and there is still a dead angle which will cause scaling. In addition, wear between the heat transfer tubes and the squeegee may cause damage to the heat exchange tubes, resulting in increased maintenance and increased maintenance costs. Summary of the invention

The invention discloses a tubular heat exchanger, which is special in that a movable spiral baffle which can be driven by a driving device is arranged in a material flow passage of a heat exchange area of the heat exchanger. The tubular heat exchanger comprises a shell-and-tube heat exchanger, a sleeve-type heat exchanger, an immersed serpentine heat exchanger and a spray-type coil heat exchanger.

 The materials are sometimes referred to as media depending on the application of the device.

 The materials include various fluid materials or other materials having suitable fluidity from liquids, solids, and gases, and any combination thereof.

 The fluid material comprises a liquid composed of a single homogeneous phase, a gas and a solid particulate material having suitable fluidity, including a slurry composed of two phases of solid and liquid, and an emulsion composed of two or more incompatible liquid phases. a gas-liquid two-phase flow composed of a gas-liquid two-phase flow such as a boiling liquid or a vapor mist, a gas-solid two-phase flow composed of two gas-solid phases, such as a soot gas, and a gas-solid liquid three-phase flow composed of gas-solid liquid three-phase Such as humidification of soot, fluid materials, including supercritical fluids that are being developed by Peng Bo.

 The spiral baffles have both continuous and discontinuous forms, and the preferred embodiment is a continuous spiral form.

 In order to maintain the shape of the spiral, the spiral baffle can be reinforced by a central connecting rod. A baffle having a large spiral diameter can be provided with a plurality of outer connecting rods in addition to the central connecting rod. For the case where the central connecting rod cannot be set due to space limitation, it is also possible to provide only a plurality of outer connecting rods.

 Depending on the shape and type of heat exchanger, the movable baffle moves in a reciprocating motion along the axis of the spiral and about the central axis of the spiral.

 When the movable baffle moves in the direction of the central axis of the spiral, its travel path should be greater than or equal to one turn of the spiral.

 For the shell-and-tube heat exchanger, the material flow passage includes a shell side and a tube length, and when the material circulating in the shell of the heat exchanger is prone to scale, the movable baffle may be disposed in the shell side. When the material flowing through the heat exchanger tube is also prone to fouling, the movable baffle can also be set in the tube path. The tube activity baffles usually have multiple groups.

 In order to distinguish the above two kinds of baffles, the baffles acting on the shell side of the heat exchanger are named as shell-side movable baffles, and the baffles acting on the tubes of the heat exchanger are named tube-element baffles.

The movement mode of the tubular movable baffle may be a mobile motion that reciprocates along the central axis of the spiral, or a rotary motion that rotates around the central axis of the spiral. In view of the complexity of simultaneous movement of multiple tube-operated baffles and the reliability of long-term operation, the use of mobile motion is preferred. Multiple tube-operated baffles are connected by a connecting plate to each central rod Be a whole.

 If the tube-floating baffle adopts a rotary motion mode, it may be considered to synchronously drive a plurality of tubular active baffles by means of a sun gear or a chain gear transmission. If the pipe passes through a slurry material that is prone to wear, the transmission part should be relatively isolated from the material passing part, and a balanced fluid that is not likely to cause wear of the transmission device is disposed in the transmission portion.

 Due to the limitation of the baffles by multiple heat exchange tubes, the movement of the shell-side movable baffles can only be moved.

 The baffle drive can be arranged outside the heat exchanger vessel or in the heat exchanger vessel. In order to ensure long-term reliability and easy maintenance of the operation of the movable baffle, the driving device of the baffle is preferably arranged outside the heat exchanger container, and the driving device is connected to the center of the shell-folding flow plate by a through connecting rod passing through the container. A rod or a connection to a lands of the central connecting rods of each of the tubular baffles.

 The heat exchanger vessel refers to the outer casing of the heat exchanger, and the shell and tube heat exchanger typically includes a casing and a header. In order to ensure the airtightness between the through connecting rod and the heat exchanger container, a hydraulic dynamic seal is provided between the through connecting rod and the heat exchanger container.

 In order to prevent the solid particles in the envelope from intruding into the sealed gap when the connecting member moves, a filter ring for preventing solid particles is disposed inside the movable sealed heat exchanger container.

 In order to further reliably prevent the solid particles in the heat exchanger container from intruding into the sealing gap during the movement of the connecting member for a long time, a transition gap band is arranged on the outer side of the filter ring inside the heat-exchange container of the dynamic seal, and the hydraulic fluid seal is intentionally placed inside. The high pressure liquid is controlled to slowly leak to the inside of the heat exchanger vessel.

 In order to avoid direct wear of the movable baffle and the tube wall or the tube wall, a gap is left between the baffle and the wall, and the short-circuit flow in these gaps can inhibit the accumulation of scale during operation.

 In order to avoid deformation of the tube bundle, the movable baffle and the shell under the action of gravity, affecting the matching gap between them, the heat exchanger is in an upright manner, and the driving device is located at the upper end of the heat exchanger.

 Tube bundles are sometimes referred to as heat exchange tubes or heat exchange tubes. The three terms have the same meaning in shell and tube heat exchangers.

Since the speed of the baffles in the heat exchanger is not too fast. In fact, each cycle of motion can range from a few minutes to a few hours to eliminate the need for precipitation and fouling. Excessive movement of the baffles can cause unfavorable pressure fluctuations or pressure changes to the heat exchanger and other associated equipment. A variety of mechanical drives that provide slow reciprocating motion can be used, preferably driven by hydraulics Reciprocating movement of the movable shell baffle and the tube baffle.

 In order to evenly distribute the material entering the heat exchanger tube and prevent it from depositing and scaling, the distributor adopts a circular tube type and allows the inlet tube to enter the annular tube in a tangential manner.

 In order to avoid tube bundle deformation damage caused by uneven thermal expansion, the thermal expansion compensating device preferably adopts a floating head type thermal expansion compensation technical solution.

 If the length of the heat exchanger is long, in order to avoid excessively long tube bundle deformation, the mismatch between the tube bundle and the shell-side baffle or the tube-side baffle is poor, and friction damage may occur. One or several may be set in the middle part of the heat exchanger. The tube bundle and the shell-side baffle support frame, such that the shell-side baffle is divided into discontinuous segments by the support frame, and the segments are integrally connected by a central connecting rod and a peripheral connecting rod.

 For the tube-type heat exchanger, the movable spiral baffle technical solution is also applicable, except that the baffle plate outside the heat exchange tube cannot be provided with a central connecting rod, but can only be reinforced with a peripheral connecting rod, and the outer connecting rod is more than two. It is preferred. In fact, a tube-and-tube heat exchanger can also be considered as a shell-and-tube heat exchanger with only one heat exchange tube. The movable spiral baffle movement on both sides of the heat exchanger tube of the sleeve-type heat exchanger can be moved or rotated.

 For the immersed coil heat exchanger and the spray coil heat exchanger, it is possible to set only the straight pipe portion as the heat exchange region, and the movable spiral baffle is arranged inside the straight pipe portion.

 Advantages of the invention:

 The active baffle can enhance the turbulence in the heat exchanger pipe cavity, and can make the most intense turbulent zone change periodically in the heat exchanger, which can prevent the formation of fouling in the low-speed flow zone while improving the heat exchange efficiency. . The larger effect of the active baffle can be that a small amount of short-circuit material flow occurs at the gap between the reserved baffle and the pipe wall, thereby causing a relatively high-speed flow of the material at the gap, and a knot that has been formed. The scale produces a periodic cleaning action that does not cause direct mechanical wear on the pipe wall and baffles, which greatly extends the maintenance and repair cycle of the equipment. In addition, if thicker scale is formed locally due to accidental reasons, the dirt will be mechanically scraped off during the movement of the baffle to prevent it from accumulating.

In addition, the invention can prevent the occurrence of deposition and thus accidental clogging of the heterogeneous material which is prone to separation when passing through the heat exchanger by the movement of the spiral baffle. DRAWINGS 1 is a partially cutaway perspective structural view of a shell-and-tube heat exchanger.

 Figure 2 is a schematic view showing the three-dimensional structure of the material passage of the shell-and-tube heat exchanger.

 Figure 3 is a schematic view showing the three-dimensional structure of the shell-side baffle system of the shell-and-tube heat exchanger.

 Figure 4 is a schematic view showing the three-dimensional structure of the tube-and-tube baffle system of the shell-and-tube heat exchanger.

 Fig. 5 is a partially cutaway perspective structural view of the annular shunt cavity of the shell-and-tube heat exchanger.

 Fig. 6 is a perspective view showing the passage of the shell-and-tube heat exchanger head, the baffle plate and the baffle connecting rod passage. Fig. 7 is a perspective view showing the sealing structure of the connecting rod passage of the baffle plate of the shell-and-tube heat exchanger.

 Figure 8 is a perspective view of the air inlet of the heat exchange tube of the shell-and-tube heat exchanger.

 Figure 9 is a partially cutaway perspective view of the casing heat exchanger.

 Fig. 10 is a perspective view showing the three-dimensional structure of the tube cavity passage of the sleeve type heat exchanger.

 Figure 11 is a perspective view showing the three-dimensional structure of the outer tube baffle system of the sleeve type heat exchanger.

 Figure 12 is a perspective view showing the three-dimensional structure of the inner tube baffle system of the sleeve type heat exchanger.

 Figure 13 is a schematic cross-sectional view of the central portion of the tube-type heat exchanger.

 Figure 14 is a schematic cross-sectional view of the outer tube baffle transmission of the sleeve type heat exchanger.

 Figure 15 shows a heat exchanger combination consisting of three tube-type heat exchanger units.

 Figure 16 is a schematic perspective view showing the structure of a spray-type serpentine heat exchanger with a spiral baffle. Figure 17 is a schematic perspective view showing the immersed serpentine tube heat exchanger with a spiral baffle. detailed description

 Example 1

 A shell-and-tube heat exchanger with a shell-side moving spiral baffle and a tube-passing moving spiral baffle.

 See Figure 1. The apparatus includes a casing 11, a baffle 12, a head 13, a heat exchange tube 14, an annular splitter 15, a shell-side moving spiral baffle assembly 16, a tube-moving helical baffle assembly 17, and a hydraulic fluid seal assembly 18. And other major components.

The combination of the casing 11, the baffle 12, the head 13, and the plurality of heat exchange tubes 14 and the corresponding portions of the conventional common shell-and-tube heat exchanger are the same, and the annular shunt chamber 15 is equivalent to the floating head tube. The floating head of the shell heat exchanger, the shell-side moving spiral baffle assembly 16 has the baffle function of the spiral baffle of the existing shell-and-tube heat exchanger, but can move within the shell, and the tube moves the spiral baffle The plate assembly 17 combines the moving helical baffles in all of the heat exchange tubes into a single unit that moves under uniform control. See Figure 1-2. The shell casing 11 is provided with a shell-side feed port 111, and the shell-side feed port 111 communicates with the inner cavity of the envelope in a tangential direction by a short circular tube, and the spiral is directed to the spiral baffle of the shell-side moving shell The same direction. In order to reduce the impact wear of the material at the feed port on the local heat exchange tube, the tube cavity may be thickened at the inlet of the shell, so that the material spirally enters the lumen from the periphery. The shell-side discharge port 112 is located at the lower end of the envelope. A pipe-length feed port 113 is provided for each of the lower sides of the casing.

 The baffle 12 is located at the upper end of the casing, and is closely connected to the upper header 13 and the lower casing 11 . The baffle 12 is provided with a plurality of openings 121, and the opening 121 is in closed communication with the inner cavity of the heat exchange tube 14. The central portion of the baffle 12 is provided with an upwardly extending central tube 122 which extends out of the upper portion of the closure and is hermetically connected to the closure.

 See Figure 8. In order to allow the pipe-way material flowing out of the baffle opening 121 to form a swirling flow in the confluence chamber 133 surrounded by the baffle 12 and the head 13, to prevent particles from depositing or fouling in the confluence chamber 133, at the opening The upper side of the 121 is provided with a directional spout 123, all of which are oriented in the tangential direction of the concentric circles where the baffle centerline 124 is centered.

 See Figures 2, 6 and 7. The head 13 is located above the baffle and has a substantially semi-cavity annular shape and encloses a semi-annular confluence chamber 133 with the baffle 12. The discharge port 131 is disposed outside the head 13 , and the pipe discharge port 131 communicates with the confluence chamber 133 in a tangential direction by a short circular pipe. A central tube perforation 132 is provided in the central portion of the half-ring along the direction of the half-ring axis for the baffle central tube 122 to pass out and to be hermetically connected to the baffle central tube 122. Two connecting rod feedthroughs 134 are provided in the upper portion of the half ring for the two through connecting rods 1802 to pass through.

 See Figures 2 and 3. The plurality of heat exchange tubes 14 pass through the through holes 1611 of the shell-side moving spiral baffle, and the upper end is hermetically connected through the baffle 13 and the tube-side confluence chamber 133 in the head, and the lower end and the annular shunt 15 are connected to the shunt chamber 154. .

See Figures 2 and 5. The annular shunt 15 is located at the lower end of the inner cavity of the casing, and is slidably connected to the casing. The splitting chambers 154 of the annular flow divider 15 are respectively in closed communication with the tubes of the heat exchange tubes 14, and are hermetically connected to the two tube inlets 113 on both sides of the lower portion of the tube through the two feed tubes 151. The feed pipe is a flexible pipe that is in closed communication with the annular splitter 15 in a tangential direction outside the annular splitter 15. A tube-pass baffle stabilizer 153 is disposed in the inner cavity of the annular shunt 15. A shell-side baffle stabilizer 152 is disposed in the center of the annular splitter, and a gap is provided on the shell-side baffle stabilizer 152 for material to pass. A plurality of outer protrusions 155 are disposed along the outer side of the annular shunt, and a space between the outer protrusions and the tube shell forms a gap through which the material can pass. See Figures 1 and 3. The shell-side moving helical baffle assembly 16 includes a shell-side moving helical baffle 161, a central connecting rod 162, and a peripheral connecting rod 163. The center connecting rod 162 and the outer peripheral connecting rod 163 are fixedly coupled to the shell-side moving spiral baffle 161 at the center and outer peripheral portions, respectively. The upper end of the central connecting rod 162 is connected to the through connecting rod 1801, and the through connecting rod 1801 is connected to the shell baffle hydraulic driving device outside the envelope through the baffle central tube 122. The lower end of the central connecting rod 162 is slidably coupled to the shell baffle stabilizing frame 152 at the center of the annular splitter 15. A gap is left between the shell-side moving spiral baffle 162 and the heat exchange tube 14 and the envelope 11. The size of the gap is limited to allow a small amount of material to pass, impact, inhibit the condensation of dirt, and does not affect the baffling effect of the baffle.

 See Figures 1, 4 and 6. The tube-moving helical baffle assembly 17 includes a plurality of sets of tube-moving helical baffles 171 and a central reinforcing rod 172, a lands 173, and a through-connecting rod 1802. The tube-moving spiral baffle 171 is fixedly coupled to the central reinforcing rod 172. The upper ends of all of the central reinforcing bars 172 are connected to the connecting plate 173, and the lower end is slidably coupled to the tube baffle stabilizer 153 provided in the inner cavity of the annular splitter 15. The lands 173 are connected to the tube baffle hydraulic drive outside the envelope by means of two through connecting rods 1802 through connecting rod feedthroughs 134.

 The central reinforcing rod 172 in the tube-moving helical baffle assembly 17 functions the same as the central connecting rod 162 in the shell-moving helical baffle assembly 16, and the different names are used herein only for the purpose of distinguishing the names.

 See Figures 1, 3, 6 and 7. The hydraulic fluid seal assembly 18 includes a filter ring 181, a sealing cap 183, a hydraulic pump (not shown), and a seal ring 185.

 The filter ring 181 is fixed to the inside of the heat exchanger container, specifically at the inner side of the baffle central tube 122 or the connecting rod through tube 134.

 The sealing cap 183 is in closed communication with the baffle central tube 122 or the connecting rod feedthrough tube 134. The sealing cap 183, which is provided separately from the flap center tube 122 or the connecting rod feedthrough 134, is for the purpose of facilitating the assembly of the head 13 and the flap 12 and replacing it after wear.

 The hydraulic pump is hermetically connected to the sealing tube 1832 of the sealing cap 183 through a connecting pipe 1831.

 The sealing cap is provided with a sealing ring groove 1832 at the free end, and the content sealing ring 185 is disposed at a connection end with the baffle central tube 122 or the connecting rod through-tube 134 to closely cooperate with the through connecting rod 1801 or 1802, at the connecting tube 1831 An annular groove 1836 is provided.

The inner diameter of the baffle central tube 122 or the connecting rod through tube 134 is smaller than that of the connecting rods 1801, 1802 The diameter is slightly larger and acts as a transition gap for the dynamic seal.

 During operation, the shell-side material enters the shell from the shell-side feed inlet, and the spiral passage formed along the shell-side baffle and the shell reaches down to the annular splitter, and is spaced apart from the outer shell of the annular splitter The gap formed between the gap and the gap of the shell-side baffle stabilizer in the center of the annular shunt continues downward, from the shell-side discharge opening, completing the shell-side process.

 The pipe-path material enters the annular heat exchanger from two pipe-path feed inlets on both sides of the lower part of the shell, and enters the heat-exchange tube respectively, and the spiral passage formed along the pipe-path baffle and the heat exchange tube passes through the baffle upward. The directional nozzle enters the confluence chamber in the head, and then flows out from the tube discharge port to complete the tube process.

 The above heat exchanger including the shell-side moving baffle and the tube-passing moving baffle can be adapted to the application process in which the shell and tube materials are easy to scale. Such applications include the heat exchange process between the coal slurry before and after the high temperature and high pressure catalytic cracking in the direct coal liquefaction process, or the heat exchange process between the coal water slurry before and after the high temperature and high pressure dehydration process in the lignite hydrothermal dehydration process, precious metal Heat exchange process of wet high temperature and high pressure leaching materials.

 If one of the shell or tube passes through a material that is not easily scaled, the moving baffle assembly on this side can be changed to a fixed baffle, such as heating the slurry material with hot steam in a pressure cooker, and the slurry is taken. Tube process, steam shell side, shell side can be changed to fixed baffle. If the heat exchange process of the non-fouling material occurs in the phase transition temperature range, the side moving baffle assembly can be omitted. If the heating medium is changed from superheated steam to saturated steam or supercritical water, the shell side can be No baffles are provided.

 The above modifications are technically known to those of ordinary skill in the art and need not be described in detail.

 Example 2

 A sleeve-type heat exchanger with an outer tube movable spiral baffle and an inner tube movable spiral baffle.

 See Figure 9. Each functional unit of the device includes an outer tube 21, an inner tube 22, a U-shaped elbow 23, an outer tube movable spiral baffle assembly, an inner tube movable spiral baffle assembly, a drive assembly, a hydraulic seal assembly and the like.

 See Figure 10. The outer tube is divided into three chambers: a transmission chamber 211, a heat exchange chamber 212 and a balance chamber.

213. The transmission cavity is provided with a worm shaft through hole 2111 and a hydraulic input hole 2112. The balance chamber 213 is provided with a hydraulic input hole 2132.

See Figures 10 and 11. There are two groups between the transmission chamber 211, the heat exchange chamber 212 and the balance chamber 213. The spacer disk 273 is separated by a spacer 274.

 See Figure 10. The inner tube penetrates the three chambers of the outer tube, and the two ends are in closed communication with the U-shaped elbow tube, and the inner tube baffle transmission through hole 231 is disposed near the joint between the elbow tube and the inner tube.

 See Figure 11. The outer tube movable spiral baffle assembly includes an outer tube movable spiral baffle 241, four baffle connecting rods 242, and two outer tube baffle connectors 243.

 See Figure 12. The inner tube movable helical baffle assembly includes an inner tube movable helical baffle 251 and a baffle central rod 252.

 See Figures 9, 11, and 14. The drive assembly includes a drive turbine 261 located within the outer tube drive cavity, a drive worm 262, and a balance section 263 located within the balance chamber. The drive turbine 261 and the balance section 263 are provided with respective semi-thrust bearings 2611 and 2631 located in the inner tube. The baffle center rod 252 penetrates the transmission through hole 231 of the U-shaped elbow that communicates at both ends of the inner tube.

 See Figures 9, 10, 13 and 14. The hydraulic seal assembly includes a hydraulic pump (not shown), a communication tube (not shown) that connects the hydraulic pump and each hydraulic seal chamber, an isolating liquid input port 2112, an isolating transmission chamber 211 and a heat exchange chamber 212, and a heat exchange chamber 212. The two sets of isolation discs 273 of the balance chamber 213 are separated from the plate 274, and a sealing mat is disposed between the separating disc 273 and the partitioning plate 274. The separating disc 273 is fixedly connected with the transmission turbine in the outer tube transmission chamber 211, and the isolating disc 273 passes through the outer tube. The baffle connector 243 is coupled to the baffle connecting rod 242.

 See Figure 11. The transmission process of the power of the spiral baffle assembly driving the outer tube during operation of the heat exchanger is external power - driving the worm 262 driving the turbine 261 - the isolating plate 273 the outer tube baffle connector 243 - the baffle connection Rod 242 - outer tube movable helical baffle 241.

 A hydraulic dynamic seal is arranged between the transmission through hole 231 of the U-shaped elbow and the central rod 252 of the baffle, and the structure thereof is similar to that of the central tube and the sealing cap of the first embodiment, except that the movement is caused by the movement. The mode is a rotary motion, and there is no problem that the baffle center rod 252 will bring the particles into the sealing gap during the movement, so there is no need to set the transition gap band.

 The sealed cavity at the transmission through-hole of the isolated transmission cavity, the balance cavity and the U-shaped elbow is pumped into the isolation sealing liquid by the high-pressure pump through the isolation liquid input port, and the specific liquid can be used in the same liquid composition as the slurry material. Liquids, other liquids that have a lubricating effect and that do not adversely affect the material at the same time can be used.

The inner and outer casing materials pass in opposite directions, causing their heat exchange to be countercurrent heat exchange. Simultaneously, The direction of rotation of the inner and outer casing movable helical baffles is preferably set to a direction that urges the material to advance. Although the active spiral baffle has little effect on the material during low-speed rotation, its potential impact needs to be considered.

 Described above is a working unit of a sleeve-type heat exchanger with an outer tube movable spiral baffle and an inner tube movable spiral baffle. Referring to Figure 15, multiple work units can be used in series to increase heat exchange area and improve heat transfer capacity.

 Example 3

 See Figure 16, a spray-type coil heat exchanger with a spiral baffle.

 It includes a liquid spray device 31, a heat exchange tube 32 and a moving spiral baffle assembly.

 In operation, the spraying device 31 sprays the coolant or the warming liquid 311 to the straight pipe portion of the heat transfer pipe 32 in the heat exchanger. The heated or cooled fluid material flows from the lower port 321 of the heat exchange tube 32, and the upper port 322 flows out. The spiral baffle 331 in the moving helical baffle assembly is reciprocated by the connection of the central connecting rod 332 passing through the wall of the heat exchange tube under the drive of an external reciprocating drive.

 Compared to conventional spray-type coiled-tube heat exchangers, a spray-type serpentine heater with a spiral baffle prevents fouling in the heat transfer lumen and improves heat transfer efficiency.

 Example 4

 See Figure 17, an immersed coiled tube heat exchanger with a spiral baffle.

 A cooling liquid container 41, a heat exchange tube 42 and a rotating spiral baffle assembly are included.

 The coolant flows from the inlet pipe 411 at the lower portion of the liquid container 41 during operation, and flows out from the upper pipe 412 of the liquid container 41. The cooled fluid material flows from the upper port of the heat exchange tube 42 to the port 421, and the lower port 422 flows out. The spiral baffle 431 in the rotating spiral baffle assembly is rotationally driven by the connection of the central connecting rod 432 passing through the wall of the heat exchange tube under the drive of an external rotary drive.

 If the heat exchanger is used to heat the fluid material in the heat exchange tube, the inlet and outlet positions of the liquid container and the heat exchange tube are respectively adjusted.

 Compared with the conventional immersed coiled-tube heat exchanger, the spray tube heat exchanger with the spiral baffle can prevent fouling in the heat exchange tube chamber and improve heat exchange efficiency. In addition, the rotating helical baffles have the additional effect of propelling the flow of fluid material within the heat transfer tubes.

 The driving methods of the spiral baffles used in Embodiment 3 and Embodiment 4 can be interchanged according to actual needs.

Claims

Rights request 1. A tubular heat exchanger comprising a shell-and-tube heat exchanger, a sleeve-type heat exchanger, a coil-shaped tube heat exchanger and a spray-tube heat exchanger, characterized in that heat exchanger heat exchanger An active helical baffle capable of moving under the drive of the baffle drive is disposed within the material flow passage of the region.  The tubular heat exchanger according to claim 1, wherein the spiral baffle has a spiral of a continuous spiral.  3. The tubular heat exchanger according to claim 2, specifically a shell-and-tube heat exchanger, wherein the material flow passage comprises a shell side and a tube length, wherein the shell side and the tube length are provided with an active folding The flow plate, which is called the shell-side active baffle and the tube-passing active baffle, respectively, has multiple sets of tube-floating baffles, and the shell-side active baffles and the tube-floating baffles are connected by a central connection. The rod is reinforced.  4. The tubular heat exchanger according to claim 3, wherein the plurality of tubular active baffles are integrally connected by a connecting plate through a central connecting rod, the shell-side movable baffle and the tube The moving baffles move in a reciprocating manner along the central axis of the spiral.  5. The tubular heat exchanger according to claim 3, wherein the movement of the shell-side movable baffle is reciprocating along a direction of a central axis of the spiral, and the movement of the tubular baffle For rotation around the central axis of the spiral, a plurality of tubular active baffles are driven to rotate synchronously by means of a sun gear or a chain gear transmission.  6. The tubular heat exchanger according to claim 4, wherein the baffle driving device is disposed outside the casing, and the baffle driving device is operated by a through connecting rod and a shell side passing through the casing. The central connecting rod of the baffle or the connecting plate connecting the central connecting rods of the respective tubular baffles is connected.  7. A tubular heat exchanger according to claim 6, wherein a hydraulically movable seal is provided between the through connecting rod and the envelope.  8. A tubular heat exchanger according to claim 7, wherein a sealing packing for preventing solid particles is disposed inside the dynamic sealing envelope. 9. The tubular heat exchanger according to claim 8, wherein a transition gap band is disposed on the inner side of the casing of the dynamic seal and outside the seal packing, and the high pressure liquid in the hydraulic fluid seal is controlled to the tube The inside of the shell leaks. 10. The tubular heat exchanger according to claim 1, wherein a gap is left between the baffles and the wall of the heat exchange tubes.  11. A tubular heat exchanger according to claim 6, wherein the heat exchanger is in an upright manner and the drive means is located at the upper end of the heat exchanger.  12. A tubular heat exchanger according to claim 11 wherein the movable shell baffle and the tube baffle are driven by hydraulic means.  13. The tubular heat exchanger according to claim 3, wherein the thermal expansion compensating device adopts a floating head thermal expansion compensating technical scheme, and the uniform flow of the tubular material is realized by a circular tubular distributor, and the distributor input pipe is in a tangential direction. Enter the ring tube.  14. The tubular heat exchanger according to claim 3, wherein one or more tube bundles and a shell-side baffle support frame are disposed in an intermediate portion of the heat exchanger, and the shell-side baffles are supported by the support frame Divided into discrete segments, each segment is connected by a central connecting rod and an auxiliary connecting rod.  15. The tubular heat exchanger according to claim 2, wherein the tubular heat exchanger is specifically a sleeve type heat exchanger, and the movable baffle moves in a direction along a central axis of the spiral Reciprocating or rotating around the central axis of the spiral.