Heat exchange device suitable for low-order pulverized coal

Abstract

The invention discloses a heat exchange device suitable for low-order pulverized coal. The heat exchange device suitable for the low-order pulverized coal comprises a heat exchanger and a shaking device, wherein the shaking device is connected with the heat exchanger; the heat exchanger comprises a flue gas inlet pipe, a flue gas outlet pipe, a temperature compensation pipe and heat exchange pipes, the flue gas inlet pipe is located below the flue gas outlet pipe, the temperature compensation pipe is located between the flue gas outlet pipe and the flue gas inlet pipe, and the temperature compensation pipe and the flue gas outlet pipe are connected through multiple rows of heat exchange pipes; the temperature compensation pipe is connected with the flue gas inlet pipe through a plurality of rows of heat exchange pipes; when the number of the temperature compensation pipes is more than two, the temperature compensation pipes are connected through a plurality of rows of heat exchange pipes; two rows of heat exchange tubes which are adjacent left and right at the same horizontal height are arranged in a staggered manner in the length direction of the flue gas outlet tube; each heat exchange tube is provided with an upper portion, a middle portion and a lower portion, the upper portions and the lower portions are connected through the middle portions, and the upper ends and the lower ends of the heat exchange tubes are staggered. The heat exchange device suitable for the low-order pulverized coal can effectively prevent caking.

Description

Technical Field

[0001] The invention relates to the technical field of coal powder processing, and in particular to a heat exchange device suitable for low-rank coal powder. Background Art

[0002] When low-grade pulverized coal is distilled at low temperature, it needs to be upgraded in an oxygen-free environment between 400-450℃. However, the gaps between particles in the pulverized coal are small, so the flue gas cannot flow smoothly in the pulverized coal pile, which makes it impossible to directly send the flue gas into the furnace for heat exchange. Therefore, a heat exchanger is needed to exchange heat between the flue gas and the pulverized coal. Conventional heat exchangers are fixed in the furnace and cannot be moved. When in use, the pulverized coal around the heat exchanger is prone to agglomeration, which causes the pulverized coal to move unsmoothly in the furnace. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a heat exchange device suitable for low-grade pulverized coal which can prevent pulverized coal from agglomerating.

[0004] In order to solve the above problems, the present invention provides a heat exchange device suitable for low-grade pulverized coal, the heat exchange device suitable for low-grade pulverized coal comprises a heat exchanger and a shaking device, the shaking device is connected to the heat exchanger, and the shaking device is used to drive the heat exchanger; the heat exchanger comprises a flue gas inlet pipe, a flue gas outlet pipe, a temperature compensation pipe and a heat exchange pipe, the flue gas inlet pipe is located below the flue gas outlet pipe, the temperature compensation pipe is located between the flue gas outlet pipe and the flue gas inlet pipe, and a plurality of rows of heat exchange pipes are connected between the temperature compensation pipe and the flue gas outlet pipe. The temperature compensation tube is connected to the flue gas inlet pipe by multiple rows of heat exchange tubes; when there are more than two temperature compensation tubes, the temperature compensation tubes are connected to the temperature compensation tubes by multiple rows of heat exchange tubes; the flue gas inlet pipe, the flue gas outlet pipe and the temperature compensation tube are all connected with flexible connecting tubes; the two adjacent rows of heat exchange tubes on the left and right at the same horizontal height are staggered in the length direction of the flue gas outlet pipe; the heat exchange tube has an upper part, a middle part and a lower part, the upper part and the lower part are connected by the middle part, and the upper part and the lower part are staggered.

[0005] Furthermore, the shaking device includes a shaking driver, a connecting rod and a traction member, one end of the traction member is fixed on the heat exchanger, and the other end of the traction member is fixed on the connecting rod, the connecting rod is connected to the shaking driver, the shaking driver is used to drive the connecting rod to move reciprocally up and down, and the connecting rod is used to pull the heat exchanger to shake through the traction member.

[0006] Furthermore, both sides of the connecting rod are connected with traction members.

[0007] Furthermore, it also includes a mounting frame, and the jitter driver is mounted on the mounting frame.

[0008] Furthermore, the heat exchange tube includes a heat exchange tube body having a tube cavity for flue gas flow and a plurality of heat exchange parts arranged in the tube cavity. The heat exchange parts are arranged on the inner wall of the tube cavity and protrude from the center of the tube cavity. The upper and lower adjacent heat exchange parts are oppositely distributed in the tube cavity, and external fins are arranged outside the heat exchange tube body.

[0009] Furthermore, the heat exchange tube body includes an upper tube body, an offset tube body and a lower tube body, the upper tube body and the lower tube body are connected by the offset tube body, the offset tube body is arranged obliquely, and the upper tube body and the lower tube body are provided with a heat exchange part and an external fin, the upper tube body, the heat exchange part arranged in the upper tube body and the external fin arranged outside the upper tube body together constitute the upper part, the offset tube body is the middle part, and the lower tube body, the heat exchange part arranged in the lower tube body and the external fin arranged outside the lower tube body together constitute the lower part.

[0010] Furthermore, the heat exchange part includes a plurality of inner fins arranged in a matrix.

[0011] Furthermore, the smoke inlet pipe has a first air inlet cavity and a first dispersion cavity installed on and connected to the first air inlet cavity, the connecting position between the first air inlet cavity and the first dispersion cavity is located in the middle of the first air inlet pipe, and a first baffle for dispersing smoke is arranged in the first dispersion cavity, and the first baffle is located at the position where the first air inlet cavity and the first dispersion cavity are connected.

[0012] Furthermore, the temperature compensating tube has a second air inlet cavity and a second dispersion cavity installed on and connected to the second air inlet cavity, the connecting position between the second air inlet cavity and the second dispersion cavity is located in the middle of the second air inlet pipe, and a second baffle for dispersing smoke is arranged in the second dispersion cavity, and the second baffle is located at the position where the second air inlet cavity and the second dispersion cavity are connected.

[0013] Furthermore, the flue gas inlet pipe is connected to a temperature compensator via a flexible connecting pipe, the temperature compensator is connected to a flue gas delivery pipe, the flue gas outlet pipe is connected to a flue gas collecting pipe via a flexible connecting pipe, and the temperature compensating pipe is connected to a burner via a flexible connecting pipe.

[0014] The heat exchange device suitable for low-grade pulverized coal of the present invention utilizes a shaking device to shake the heat exchanger. At the same time, two adjacent rows of heat exchange tubes are staggered, and the upper and lower ends of the heat exchange tubes are staggered, so that the pulverized coal is looser during the falling process and will not easily agglomerate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of a furnace body equipped with a heat exchange device suitable for low-grade pulverized coal according to the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the shaking device.

[0017] Figure 3 It is the distribution diagram of the heat exchanger in the furnace body.

[0018] Figure 4 It is a schematic diagram of the flow of flue gas in the heat exchanger.

[0019] Figure 5 It is a schematic diagram of the structure of the flue gas inlet pipe and the temperature compensation pipe.

[0020] Figure 6 yes Figure 4 A partial enlarged view of middle A.

[0021] Figure 7 This is the distribution diagram of heat exchange tubes on the same horizontal plane.

[0022] Figure 8 It is a structural diagram of the heat exchange tube.

[0023] Fig. 9 It is a schematic diagram of the internal structure of the heat exchange tube.

[0024] Fig.10 It is a cross-sectional view of BB.

[0025] The meanings of the symbols in the accompanying drawings are:

[0026] Furnace body 1, heat exchanger 2, flue gas outlet pipe 21, flue gas inlet pipe 22, first air inlet pipe body 221, first dispersion pipe body 222, first baffle 223, first air inlet cavity 2201, first dispersion cavity 2202, temperature compensation tube 23, second air inlet pipe body 231, second dispersion pipe body 232, second baffle 233, second air inlet cavity 2301, second dispersion cavity 2302, heat exchange tube 24, heat exchange tube body 241, upper tube body 2411, offset tube body 2412, lower tube body 2413, heat exchange part 242, inner fin 2421, outer fin 243, flexible sealing ring 25, shaking device 3, shaking driver 31, connecting rod 32, traction member 33, mounting frame 4, temperature compensator 5, burner 51, heating box 52, flue gas supply pipe 6, flue gas collection pipe 7, flexible connecting pipe 8. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1As shown, a preferred embodiment of the heat exchange device suitable for low-grade pulverized coal of the present invention includes a heat exchanger 2, a shaking device 3 and a mounting frame 4. The heat exchanger 2 is located in the furnace body 1, and there are multiple heat exchangers 2. The heat exchanger 2 is used to exchange heat with pulverized coal, that is, to heat the pulverized coal. Each of the heat exchangers 2 is connected to a shaking device 3, that is, there are multiple shaking devices, and each shaking device 3 corresponds to a heat exchanger 2. The shaking device 3 is used to drive the heat exchanger 2 to shake. The mounting frame 4 is arranged inside and outside the furnace body 1, and the shaking device 3 is installed on the mounting frame 4. The shaking device 3 passes through the furnace top and is connected to the heat exchanger 2. The shaking device 3 drives the heat exchanger 2 to shake, so that the pulverized coal near the heat exchanger 2 is not easy to agglomerate. In other embodiments, the shaking device 3 can also be installed on the furnace top without the mounting frame 4.

[0029] refer to Figure 1 , Figure 2 and Figure 3 Each of the shaking devices 3 includes a shaking driver 31, a connecting rod 32 and a traction member 33. The shaking driver 31 is mounted on the mounting frame 4. The shaking driver 31 is used to provide shaking power. There are two shaking drivers 31. The two shaking drivers 31 are distributed on both sides of the furnace body 1, that is, corresponding to the two ends of the heat exchanger 2; the shaking driver 31 is a hydraulic cylinder. Of course, a cylinder or an electric cylinder, or other equipment that can be lifted and lowered, can also be used. The two ends of the connecting rod 32 are respectively connected to the two shaking drivers 31, and the shaking driver 31 drives the connecting rod 32 to move up and down; the connecting rod 32 is made of I-beam, which is convenient for reducing costs. One end of the traction member 33 is fixed on the heat exchanger 2, and the other end of the traction member 33 is fixed on the connecting rod 32. The traction member 33 is a traction tube or a traction rope. Both sides of the connecting rod 32 are connected with traction members 33, so that the traction heat exchanger 2 is more stable. The shaking driver 31 drives the connecting rod 32 to move up and down reciprocatingly, the connecting rod 32 drives the traction member 33 to move up and down, and the traction member 33 pulls the heat exchanger 2 to move up and down reciprocatingly, so that the heat exchanger 2 shakes.

[0030] like Figures 4 to 6 As shown, the heat exchanger 2 includes a flue gas inlet pipe 22, a flue gas outlet pipe 21, a temperature compensation pipe 23 and a heat exchange pipe 24 extending out of the furnace body 1. The flue gas inlet pipe 22 is located below the flue gas outlet pipe 21, and the temperature compensation pipe 23 is located between the flue gas outlet pipe 21 and the flue gas inlet pipe 22. The temperature compensation pipe 23 is connected to the flue gas outlet pipe 21 through four rows of heat exchange pipes 24; the temperature compensation pipe 23 is connected to the temperature compensation pipe 23 through four rows of heat exchange pipes 24; the temperature compensation pipe 23 is connected to the flue gas inlet pipe 22 through four rows of heat exchange pipes 24, and the heat exchange pipes 24 in each row are distributed at the same spacing.

[0031] The flue gas inlet pipe 22 is used to introduce high-temperature flue gas and send it into the heat exchange pipe 24; the heat exchange pipe 24 is used to exchange heat for pulverized coal. Both ends of the flue gas inlet pipe 22 extend out of the furnace body 1, and a flexible sealing ring 25 is provided on the flue gas inlet pipe 22. The flexible sealing ring 25 is used to seal the gap between the flue gas inlet pipe 22 and the furnace body 1, so as to ensure that when the flue gas inlet pipe 22 shakes with the heat exchanger 2, the flexible sealing ring 25 can be deformed, so that the flue gas inlet pipe 22 and the furnace body 1 are always in a sealed state; the flue gas inlet pipe 22 is connected to a temperature compensator 5, and the temperature compensator 5 is used to increase the temperature of the flue gas to ensure that the flue gas sent to the heat exchanger 2 is always within the design requirements. The flue gas inlet pipe 22 is connected with a flexible connecting pipe 8, so that the flue gas inlet pipe 22 can be conveniently connected to the temperature compensator 5; in other words, when the heat exchanger 2 shakes, the flue gas inlet pipe 22 follows the shaking, and the temperature compensator 5 will not follow the shaking, and at the same time, the connection between the flexible connecting pipe 8 and the temperature compensator 5 can be guaranteed. The temperature compensator 5 is connected to the flue gas supply pipe 6, that is, all temperature compensators 5 are connected to the flue gas supply pipe 6.

[0032] The smoke inlet pipe 22 includes a first inlet pipe body 221 and a first dispersed pipe body 222. The first dispersed pipe body 222 is installed on the first inlet pipe body 221. The first inlet pipe body 221 has a first inlet cavity 2201. The first dispersed pipe body 222 has a first dispersed cavity 2202. The heat exchange pipe 24 is installed on the first dispersed pipe body 222 and communicates with the first dispersed cavity 2202. Through holes are provided on the first inlet pipe body 221 and the first dispersed pipe body 222. The through holes on the first inlet cavity 2201 are aligned with the through holes on the first dispersed cavity 2202, so that the first inlet cavity 2201 and the first dispersed cavity 2202 are communicated, so that smoke can enter the first dispersed cavity 2202 from the first inlet cavity 2201, and then enter the heat exchange pipe 24 for heat exchange. Both ends of the first inlet cavity 2201 are air inlets, which increase the air intake speed. The through hole of the first air inlet cavity 2201 is located in the middle of the first air inlet cavity 2201, and the through hole of the first dispersion cavity 2202 is located in the middle of the first dispersion cavity 2202. A first baffle 223 for dispersing smoke is also provided in the first dispersion cavity 2202. The position of the first baffle 223 is located in the middle of the first dispersion cavity 2202, so that the first baffle 223 corresponds to the position of the through hole, so that after the smoke enters the first dispersion cavity 2202, it is first dispersed by the first baffle 223 and then enters the heat exchange tube 24. The smoke is distributed as evenly as possible before entering the heat exchange tube 24 connected to the first dispersion cavity 2202, thereby ensuring that the temperature of the heat exchange tube 24 connected to the first dispersion cavity 2202 remains consistent. In other embodiments, the smoke inlet pipe 22 can also be a larger pipe, and two opposing partitions are arranged in the pipe to divide the internal space of the pipe into a first air inlet cavity 2201 and a first dispersion cavity 2202. The first air inlet cavity 2201 is below the partition plate, and the first dispersion cavity 2202 is above the partition plate. A gap is left between the partition plates to ensure that the first air inlet cavity 2201 and the first dispersion cavity 2202 are connected.

[0033] The temperature compensator 5 includes a burner 51 and a heating box 52. The burner 51 is installed on the heating box 52, and the flue gas supply pipe 6 is connected to the heating box 52. The flue gas supply pipe 6 delivers flue gas into the heating box 52, and the burner 51 heats the flue gas in the heating box 52, so that the temperature of the flue gas can reach the design requirements.

[0034] The temperature compensation tube 23 is used to compensate for the temperature of the flue gas therein. Both ends of the temperature compensation tube 23 extend out of the furnace body 1. A flexible sealing ring 25 is provided on the temperature compensation tube 23. The flexible sealing ring 25 is used to seal the gap between the temperature compensation tube 23 and the furnace body 1, so as to ensure that when the temperature compensation tube 23 follows the vibration of the heat exchanger 2, the flexible sealing ring 25 can be deformed to ensure that the temperature compensation tube 23 and the furnace body 1 are always in a sealed state; the temperature compensation tube 23 is connected to a burner 51, and the burner 51 is used to increase the temperature of the flue gas in the temperature compensation tube 23, so as to ensure that the flue gas in the heat exchanger 2 is always within the design requirements. The flexible sealing ring 25 can be made of high-temperature resistant refractory cloth or other refractory materials. The temperature compensation tube 23 is connected to a flexible connecting tube 8, so that the temperature compensation tube 23 can be easily connected to the burner 51; in other words, when the heat exchanger 2 shakes and the flue gas inlet pipe 22 follows the shaking, the burner 51 will not shake along, while the connection between the flexible connecting tube 8 and the burner 51 can be guaranteed.

[0035] The temperature compensation tube 23 includes a second air intake pipe body 231 and a second dispersed pipe body 232, wherein the second dispersed pipe body 232 is installed on the second air intake pipe body 231, the second air intake pipe body 231 has a second air intake cavity 2301, and the second dispersed pipe body 232 has a second dispersed cavity 2302. The heat exchange tube 24 above the temperature compensation tube 23 is installed on the second dispersed pipe body 232 and is connected to the second dispersed cavity 2302, and the heat exchange tube 24 below the temperature compensation tube 23 is installed on the second air intake pipe body 231 and is connected to the second air intake cavity 2301. The second air inlet pipe body 231 and the second dispersion pipe body 232 are both provided with through holes, and the through holes on the second air inlet cavity 2301 are aligned with the through holes on the second dispersion cavity 2302, so that the second air inlet cavity 2301 and the second dispersion cavity 2302 are connected, so that the smoke in the heat exchange tube 24 below the temperature compensation tube 23 can enter the second dispersion cavity 2302 from the second air inlet cavity 2301, and then enter the heat exchange tube 24 above the temperature compensation tube 23 for heat exchange. Both ends of the second air inlet cavity 2301 are air inlets to increase the air intake speed. The through hole of the second air inlet cavity 2301 is located in the middle of the second air inlet cavity 2301, and the through hole of the second dispersion cavity 2302 is located in the middle of the second dispersion cavity 2302. A second baffle 233 for dispersing smoke is also provided in the second dispersion cavity 2302. The second baffle 233 is located in the middle of the second dispersion cavity 2302, so that the second baffle 233 corresponds to the position of the through hole, so that smoke is first dispersed by the second baffle 233 after entering the second dispersion cavity 2302 and then enters the heat exchange tube 24, and the smoke is evenly distributed as much as possible before entering the heat exchange tube 24 connected to the second dispersion cavity 2302, so as to ensure that the temperature of the heat exchange tube 24 connected to the second dispersion cavity 2302 remains consistent. According to the different heights of the temperature compensation tube 23, the temperature at which the heating device heats the smoke is different to ensure the heat exchange requirements. In other embodiments, the temperature compensation tube 23 can also be a larger tube. Two opposing partitions are arranged in the tube to divide the internal space of the tube into a second air inlet cavity 2301 and a second dispersion cavity 2302. The second air inlet cavity 2301 is located below the partition plate, and the second dispersion cavity 2302 is located above the partition plate. A gap is left between the partition plates to ensure that the second air inlet cavity 2301 and the second dispersion cavity 2302 are connected.

[0036] The flue gas outlet pipe 21 is used to collect flue gas after all heat exchange is completed, and discharge the flue gas out of the furnace body 1. Both ends of the flue gas outlet pipe 21 extend out of the furnace body 1, and a flexible sealing ring 25 is provided on the flue gas outlet pipe 21. The flexible sealing ring 25 is used to seal the gap between the flue gas outlet pipe 21 and the furnace body 1, so as to ensure that when the flue gas outlet pipe 21 shakes with the heat exchanger 2, the flexible sealing ring 25 can be deformed, so that the flue gas outlet pipe 21 and the furnace body 1 are always in a sealed state; the flue gas outlet pipe 21 is connected to the flue gas collection pipe 7, and the flue gas collection pipe 7 is used to collect flue gas, so as to facilitate the harmless treatment after the flue gas is collected. The flue gas outlet pipe 21 is connected with a flexible connecting pipe 8, so that the flue gas outlet pipe 21 and the flue gas collecting pipe 7 can be conveniently connected; in other words, when the heat exchanger 2 shakes, the flue gas outlet pipe 21 follows the shaking, and the flue gas collecting pipe 7 will not follow the shaking, while the connection between the flexible connecting pipe 8 and the flue gas collecting pipe 7 can be guaranteed.

[0037] like Figures 7 to 10 As shown, the heat exchange tube 24 includes a heat exchange tube body 241 and a plurality of heat exchange parts 242 arranged on the heat exchange tube body 241. The heat exchange tube body 241 has a tube cavity for flue gas flow. The heat exchange part 242 is arranged on the inner wall of the tube cavity, and the heat exchange part 242 protrudes toward the center of the tube cavity to increase the heat exchange area and ensure the efficiency of heat absorption. The upper and lower adjacent heat exchange parts 242 are oppositely distributed in the tube cavity, that is, the heat exchange parts 242 are alternately distributed in the tube cavity one by one. The outer wall of the heat exchange tube body 241 is provided with an outer fin 243, and the outer fin 243 is used to increase the heat exchange area, that is, to increase the contact area between the heat exchange tube body 241 and the pulverized coal. Usually, four outer fins 243 are set, and it is not advisable to set too many outer fins 243, which is easy to cause the coal powder to accumulate and eventually agglomerate, so as to prevent the pulverized coal from agglomerating.

[0038] The arc length of the heat exchange part 242 is smaller than the circular circumference of the tube cavity. The arc length of the heat exchange part 242 is usually set to half the circumference of the center of the tube cavity. In this way, while ensuring a certain heat exchange effect, the flue gas can also form turbulence in the tube cavity. Turbulence can prevent the same part of the flue gas from always contacting the heat exchange tube 24, that is, the temperature of the flue gas near the center of the tube cavity will not be higher than the temperature of the flue gas near the inner wall of the tube cavity. The temperature of the flue gas at the same height position is basically the same, and the heat energy of all the flue gas can be utilized. The heat exchange part 242 includes a plurality of inner fins 2421 arranged in a matrix, using a conventional fin structure, without the need to use a new process for processing, which can reduce processing costs.

[0039] The heat exchange tube body 241 includes an upper tube body 2411, a staggered tube body 2412 and a lower tube body 2413. A heat exchange part 242 is arranged in the upper tube body 2411 and the lower tube body 2413. The upper tube body 2411 and the lower tube body 2413 are connected by the staggered tube body 2412. The staggered tube body 2412 is arranged obliquely so that the upper tube body 2411 and the lower tube body 2413 are staggered, that is, the upper end of the heat exchange tube 24 is staggered with the lower end of the heat exchange tube 24, thereby realizing the staggered direction of the heat exchange tube 24.

[0040] When in use, the pulverized coal first passes through the upper heat exchange tube 24 for preliminary heating, then enters the middle heat exchange tube 24 for secondary heating, and finally enters the lower heat exchange tube 24 for final heating. The heat exchange tube 24 retains the heat exchange part 242 to ensure the heat exchange effect. At the same time, the upper and lower adjacent heat exchange parts 242 are arranged oppositely, which can reduce the processing amount, reduce the processing cost and thus reduce the procurement cost. The oppositely arranged heat exchange parts 242 can also make the flue gas turbulent and flow in an S shape in the tube cavity, ensuring that the flue gas can evenly heat the heat exchange tube 24 and maximize the use of the heat energy of the flue gas.

[0041] When shaking is required, the shaking driver 31 drives the connecting rod 32 to move up and down, the connecting rod 32 drives the traction member 33 to move up and down, and the traction member 33 drives the heat exchanger 2 to move up and down, so as to achieve shaking of the heat exchanger 24. At the same time, the heat exchange tube 24 itself can be staggered in the vertical direction, and the staggered setting of the heat exchange tubes 24 in an adjacent row can make the pulverized coal evenly heated, and make the pulverized coal fluffy and not easy to agglomerate during the falling process. Compared with the simple layout of the conventional matrix arrangement without staggering, the staggered layout structure design of the heat exchange tube 24 in the present application can reduce the usage of the heat exchange tube 24 by half while achieving the same heat exchange effect, and can also make the pulverized coal fluffy, so that the pulverized coal near the heat exchanger 2 is fluffy and will not agglomerate, and the heat exchanger 2 can be shaken regularly.

[0042] The above are only implementation modes of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention's specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the present invention.

Claims

1. A heat exchange device suitable for low-grade pulverized coal, characterized in that: It includes a heat exchanger and a shaking device, the shaking device is connected to the heat exchanger, and the shaking device is used to drive the heat exchanger; the heat exchanger includes a smoke inlet pipe, a smoke outlet pipe, a temperature compensation tube and a heat exchange tube, the smoke inlet pipe is located below the smoke outlet pipe, the temperature compensation tube is located between the smoke outlet pipe and the smoke inlet pipe, the temperature compensation tube is connected to the smoke outlet pipe through multiple rows of heat exchange tubes, and the temperature compensation tube is connected to the smoke inlet pipe through multiple rows of heat exchange tubes; when there are more than two temperature compensation tubes, the temperature compensation tubes are connected to the temperature compensation tubes through multiple rows of heat exchange tubes; the smoke inlet pipe, the smoke outlet pipe and the temperature compensation tube are all connected with flexible connecting tubes; two adjacent rows of heat exchange tubes on the left and right at the same horizontal height are staggered in the length direction of the smoke outlet pipe; the upper end of the heat exchange tube is staggered with the lower end of the heat exchange tube.

2. The heat exchange device suitable for low-rank pulverized coal according to claim 1, characterized in that: The shaking device includes a shaking driver, a connecting rod and a traction member, one end of the traction member is fixed on the heat exchanger, and the other end of the traction member is fixed on the connecting rod. The connecting rod is connected to the shaking driver, and the shaking driver is used to drive the connecting rod to move reciprocally up and down. The connecting rod is used to pull the heat exchanger to shake through the traction member.

3. The heat exchange device suitable for low-rank pulverized coal according to claim 2, characterized in that: Both sides of the connecting rod are connected with traction pieces.

4. The heat exchange device suitable for low-rank pulverized coal according to claim 1, characterized in that: Also included is a mounting frame on which the dither driver is mounted.

5. The heat exchange device suitable for low-rank pulverized coal according to claim 1, characterized in that: The heat exchange tube includes a heat exchange tube body having a tube cavity for flue gas to flow and a plurality of heat exchange parts arranged in the tube cavity. The heat exchange parts are arranged on the inner wall of the tube cavity and protrude from the center of the tube cavity. The upper and lower adjacent heat exchange parts are oppositely distributed in the tube cavity. External fins are arranged outside the heat exchange tube body.

6. The heat exchange device suitable for low-rank pulverized coal according to claim 5, characterized in that: The heat exchange tube body includes an upper tube body, an offset tube body and a lower tube body, the upper tube body and the lower tube body are connected by the offset tube body, the offset tube body is arranged obliquely, the upper tube body and the lower tube body are provided with a heat exchange part and an external fin, the upper tube body, the heat exchange part arranged in the upper tube body and the external fin arranged outside the upper tube body together constitute the upper part, the offset tube body is the middle part, and the lower tube body, the heat exchange part arranged in the lower tube body and the external fin arranged outside the lower tube body together constitute the lower part.

7. The heat exchange device suitable for low-rank pulverized coal according to claim 5, characterized in that: The heat exchange portion includes a plurality of inner fins arranged in a matrix.

8. The heat exchange device suitable for low-rank pulverized coal according to claim 1, characterized in that: The smoke inlet pipe has a first air inlet cavity and a first dispersion cavity installed on and connected with the first air inlet cavity. The connecting position between the first air inlet cavity and the first dispersion cavity is located in the middle of the first air inlet pipe. A first baffle for dispersing smoke is arranged in the first dispersion cavity. The first baffle is located at the position where the first air inlet cavity and the first dispersion cavity are connected.

9. The heat exchange device suitable for low-rank pulverized coal according to claim 1, characterized in that: The temperature compensation tube has a second air inlet cavity and a second dispersion cavity installed on and connected with the second air inlet cavity. The connecting position between the second air inlet cavity and the second dispersion cavity is located in the middle of the second air inlet pipe. A second baffle for dispersing smoke is arranged in the second dispersion cavity. The second baffle is located at the connecting position between the second air inlet cavity and the second dispersion cavity.

10. The heat exchange device suitable for low-rank pulverized coal according to claim 1, characterized in that: The flue gas inlet pipe is connected to a temperature compensator through a flexible connecting pipe, the temperature compensator is connected to a flue gas delivery pipe, the flue gas outlet pipe is connected to a flue gas collecting pipe through a flexible connecting pipe, and the temperature compensating pipe is connected to a burner through a flexible connecting pipe.

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