Low-temperature upgrading furnace

Abstract

The present invention discloses a low-temperature upgrading furnace. The low-temperature upgrading furnace includes a furnace body, a heat exchanger for heating pulverized coal in the furnace body, a shaking device for driving the heat exchanger to shake, a gas collecting device for collecting the gas in the heated pulverized coal, and a cooling device for cooling the heated pulverized coal. The shaking device is connected to the heat exchanger; the gas collecting device includes a first gas distributor for collecting gas. The first gas distributors are arranged in the horizontal direction, and adjacent first gas distributors are arranged in a staggered manner in the vertical direction. The first gas distributors in the upper and lower adjacent gas collecting devices are arranged in a horizontal staggered manner; the cooling device includes a second gas distributor for releasing cooling gas. The second gas distributors are arranged in the horizontal direction, and adjacent second gas distributors are arranged in a staggered manner in the vertical direction. The second gas distributors in the upper and lower adjacent cooling devices are arranged in a horizontal staggered manner. The pulverized coal dry-distilled by the low-temperature upgrading furnace of the present invention is not easy to agglomerate and the pulverized coal is fluffy.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature carbonization, and particularly to a low-temperature upgrading furnace. Background Art

[0002] When low-rank pulverized coal is subjected to low-temperature carbonization, it needs to be upgraded in an oxygen-free environment between 400-450°C. However, the gaps between particles in the pulverized coal are small, and gas cannot flow smoothly within the pulverized coal pile, resulting in easy caking of the pulverized coal in the furnace body and uneven quality of the pulverized coal obtained by low-temperature carbonization. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a low-temperature upgrading furnace that can prevent pulverized coal from caking in the furnace body.

[0004] To solve the above problems, the present invention provides a low-temperature upgrading furnace, which includes a furnace body, a heat exchanger for heating the pulverized coal in the furnace body, a shaking device for driving the heat exchanger to shake, a gas collecting device for collecting the gas in the heated pulverized coal, and a cooling device for cooling the heated pulverized coal. The shaking device is connected to the heat exchanger, and the gas collecting device and the cooling device are located below the heat exchanger; the gas collecting device includes a first gas distributor for collecting gas, the first gas distributors are arranged horizontally, and adjacent first gas distributors are arranged offset in the vertical direction, and the first gas distributors in the upper and lower adjacent gas collecting devices are arranged offset in the horizontal direction; the cooling device includes a second gas distributor for releasing cooling gas, the second gas distributors are arranged horizontally, and adjacent second gas distributors are arranged offset in the vertical direction, and the second gas distributors in the upper and lower adjacent cooling devices are arranged offset in the horizontal direction.

[0005] Furthermore, the gas collecting device further includes a gas collecting box and a gas exhaust pipe. The gas collecting box is installed outside the furnace body, and both ends of each first gas distributor pass through the furnace body and extend into the gas collecting box. The gas exhaust pipe is installed on the gas collecting box to connect the gas collecting boxes at both ends of the first gas distributor.

[0006] Furthermore, the cooling device further includes a gas distribution box. The second gas distributor is installed inside the furnace body, the gas distribution box is installed outside the furnace body, both ends of the second gas distributor pass through the furnace body and extend into the gas distribution box, and the gas distribution box is connected with a gas supply pipe, and external cooling gas is sent into the gas distribution box through the gas supply pipe.

[0007] Further, both the first gas distributor and the second gas distributor include a distribution connecting pipe, a distribution box, and a pulverized coal baffle. The distribution connecting pipe is installed on the furnace body, the distribution box is installed on the distribution connecting pipe, the distribution box is communicated with the connecting pipe, a gas passage is provided on the distribution box, the gas passage of the distribution box is used for collecting coal gas, the pulverized coal baffle is installed on the distribution box, and the pulverized coal baffle is obliquely arranged on the distribution box.

[0008] Further, a first ventilation port and a second ventilation port are provided on the distribution box, the first ventilation port and the second ventilation port constitute a gas passage, the first ventilation port is located on the side wall of the distribution box, and the second ventilation port is located at the bottom of the distribution box.

[0009] Further, there are multiple first ventilation ports, and multiple rows of the first ventilation ports are arranged on each side wall of the distribution box.

[0010] Further, it further includes a discharger for discharging the cooled pulverized coal and a discharge hopper for receiving the pulverized coal discharged by the discharger. The discharger is installed on the furnace body, and the discharge hopper has a gas collection interlayer for collecting the coal gas in the material collecting hopper.

[0011] Further, the discharge hopper includes a material collecting hopper, a support hopper, a fixing rod, and a pulverized coal retaining ring. The support hopper is installed in the material collecting hopper through the fixing rod, the pulverized coal retaining ring is installed on the material collecting hopper or the fixing rod, a gap between the pulverized coal retaining ring and the inner wall of the material collecting hopper forms a gas collection interlayer, the upper end of the pulverized coal retaining ring abuts against the inner wall of the material collecting hopper, and the upper end of the pulverized coal retaining ring abuts against the inner wall of the material collecting hopper to seal the upper end of the gas collection interlayer.

[0012] Further, a maintenance port is provided on the material collecting hopper.

[0013] Further, the jitter device includes a jitter driver, a connecting rod, and a traction member. One end of the traction member is fixed on the heat exchanger, the other end of the traction member is fixed on the connecting rod, the connecting rod is connected with the jitter driver, the jitter driver is used to drive the connecting rod to move up and down reciprocally, and the connecting rod is used to pull the heat exchanger to jitter through the traction member.

[0014] The low-temperature upgrading furnace of the present invention drives the heat exchanger to jitter by using the jitter device, which can prevent the pulverized coal from caking. The first gas distributor and the second gas distributor are arranged in dislocation both in the horizontal direction and the vertical direction, so that when the pulverized coal passes through the cooling device and the gas collection device, caking can be avoided, and anti-caking structures are arranged at all positions where caking is likely to occur, effectively ensuring the quality of the pulverized coal after low-temperature carbonization. Description of the Drawings

[0015] Figure 1It is a schematic structural diagram of a preferred embodiment of the low-temperature upgrading furnace of the present invention.

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

[0017] Figure 3 It is a 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 structural diagram of the flue gas inlet pipe and the temperature compensation pipe.

[0020] Figure 6 It is Figure 4 A partial enlarged view of A in

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

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

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

[0024] Figure 10 It is Figure 8 A sectional view taken along B-B in

[0025] Figure 11 It is a schematic structural diagram of the gas collecting device and the cooling device.

[0026] Figure 12 It is a distribution diagram of the first gas distributor and the second gas distributor.

[0027] Figure 13 It is a sectional view of the first gas distributor.

[0028] Figure 14 It is Figure 13 A sectional view taken along C-C in

[0029] Figure 15 It is a schematic structural diagram of the discharger and the discharge hopper.

[0030] Figure 16 It is a top view of the discharge hopper.

[0031] Figure 17 It is Figure 16 A sectional view taken along D-D in

[0032] The meanings of the reference numerals in the drawings are as follows:

[0033] Furnace body 1, heat exchanger 2, flue gas outlet pipe 21, flue gas inlet pipe 22, first inlet pipe body 221, first dispersion pipe body 222, first baffle 223, first inlet air cavity 2201, first dispersion cavity 2202, temperature compensation pipe 23, second inlet pipe body 231, second dispersion pipe body 232, second baffle 233, second inlet air cavity 2301, second dispersion cavity 2302, heat exchange pipe 24, heat exchange pipe body 241, upper pipe body 2411, offset pipe body 2412, lower pipe 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 bracket 4, temperature compensator 5, burner 51, heating box 52, flue gas supply pipe 53, flue gas collection pipe 54, flexible connecting pipe 55, gas collection device 6a, first gas collector 61, collector connecting pipe 611, communication opening 6111, collector box 612, first ventilation opening 6121, second ventilation opening 6122, pulverized coal baffle 613, gas accumulation box 62, gas exhaust pipe 63, cooling device 6b, second gas collector 64, gas distribution box 65, gas supply pipe 66, discharger 7, discharge hopper 8, gas collection interlayer 80, material gathering hopper 81, inspection opening 811, support hopper 82, fixed rod 83, pulverized coal retaining ring 84, gas collecting pipe 85. Detailed implementation manner

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] As Figure 1 and Figure 15As shown in the figure, a preferred embodiment of the low-temperature upgrading furnace of the present invention includes a furnace body 1, a heat exchanger 2, a shaking device 3, a mounting frame 4, a gas collecting device 6a, a cooling device 6b, a discharging device 7 and a discharging hopper 8. The heat exchanger 2 is located inside the furnace body 1. The furnace body 1 has a dry distillation section and a cooling and gas collecting section. The dry distillation section is located above the cooling and gas collecting section. After the pulverized coal is dry-distilled in the dry distillation section, it slides down to the cooling and gas collecting section. The heat exchanger 2 is located in the dry distillation section. There are multiple heat exchangers 2, and the heat exchanger 2 is used to exchange heat with the pulverized coal, that is, to heat the pulverized coal. Each heat exchanger 2 is connected to a shaking device 3, that is, there are also multiple shaking devices. Each shaking device 3 corresponds to a heat exchanger 2, and 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. The shaking device 3 is installed on the mounting frame 4, and 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 easily caked. In other embodiments, the shaking device 3 can also be installed on the furnace top without the mounting frame 4. There are multiple gas collecting devices 6a arranged vertically. The gas collecting device 6a is used to collect the gas generated by the pulverized coal after dry distillation. The cooling device 6b is used to cool the pulverized coal. The gas collecting device 6a and the cooling device 6b are both located in the cooling and gas collecting section of the furnace body 1. Usually, the cooling device 6b is at the lower end of the cooling and gas collecting section. In order to ensure the collection of gas as much as possible, a gas collecting device 6a is usually arranged below the cooling device 6b. The discharging device 7 is installed on the furnace body 1. The cooled pulverized coal in the furnace body 1 is discharged through the discharging device 7. The discharging hopper 8 is installed on the discharging device 7. The discharging hopper 8 is used to receive and gather the pulverized coal discharged by the discharging device 7, and at the same time collect the gas in the discharging hopper 8. A gas collecting pipe 85 is arranged on the discharging hopper 8, and the gas collecting pipe 85 is used to send the gas collected by the discharging hopper 8 into an external gas treatment system.

[0036] Reference Figure 1 、 Figure 2 and Figure 3, each of the jitter devices 3 includes a jitter driver 31, a connecting rod 32, and a traction member 33. The jitter driver 31 is installed on the mounting bracket 4. The jitter driver 31 is used to provide the power for jitter. There are two jitter drivers 31, and the two jitter 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 jitter driver 31 is a hydraulic cylinder. Of course, an air cylinder or an electric cylinder can also be used, or other devices that can lift. Both ends of the connecting rod 32 are respectively connected to the two jitter drivers 31, and the jitter driver 31 drives the connecting rod 32 to move up and down; the connecting rod 32 is made of I-beam to facilitate cost reduction. 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 pipe or a traction rope. Traction members 33 are connected to both sides of the connecting rod 32, so that the force on the traction heat exchanger 2 is more stable. The jitter driver 31 drives the connecting rod 32 to move up and down reciprocally, 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 reciprocally, so that the heat exchanger 2 jitters.

[0037] As Figures 4 to 6 shown, the heat exchanger 2 includes a flue gas inlet pipe 22, a flue gas outlet pipe 21, a temperature compensation pipe 23, and heat exchange pipes 24 that extend 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; between the temperature compensation pipe 23 and 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 each row of heat exchange pipes 24 is distributed at the same interval.

[0038] The flue gas inlet pipe 22 is used to introduce and send high-temperature flue gas into the heat exchange pipe 24; the heat exchange pipe 24 is used to heat the 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 around 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 follows the vibration of the heat exchanger 2, the flexible sealing ring 25 can deform, 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 with 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 into the heat exchanger 2 is always within the design requirement range. The flue gas inlet pipe 22 is connected with a flexible connecting pipe 55, so that it is convenient to connect the flue gas inlet pipe 22 with the temperature compensator 5; in other words, when the heat exchanger 2 vibrates and the flue gas inlet pipe 22 follows the vibration, the temperature compensator 5 will not follow the vibration, and at the same time, the connection between the flexible connecting pipe 55 and the temperature compensator 5 can be ensured. The temperature compensator 5 is connected with a flue gas delivery pipe 53, that is, all the temperature compensators 5 are connected with the flue gas delivery pipe 53.

[0039] The flue gas inlet pipe 22 includes a first inlet pipe body 221 and a first dispersion pipe body 222. The first dispersion pipe body 222 is installed on the first inlet pipe body 221. The first inlet pipe body 221 has a first inlet cavity 2201, and the first dispersion pipe body 222 has a first dispersion cavity 2202. The heat exchange tube 24 is installed on the first dispersion pipe body 222 and communicates with the first dispersion cavity 2202. Through holes are provided on both the first inlet pipe body 221 and the first dispersion pipe body 222, and the through holes on the first inlet cavity 2201 are aligned with the through holes on the first dispersion cavity 2202, so that the first inlet cavity 2201 and the first dispersion cavity 2202 are communicated. In this way, the flue gas can enter from the first inlet cavity 2201 into the first dispersion cavity 2202, and then enter the heat exchange tube 24 for heat exchange. Both ends of the first inlet cavity 2201 are air inlets to increase the air intake speed. The through hole of the first inlet cavity 2201 is located in the middle of the first 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 the flue gas is further 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, and the flue gas is dispersed by the first baffle 223 before entering the heat exchange tube 24 after entering the first dispersion cavity 2202. As much as possible, the flue gas is evenly distributed before entering the heat exchange tube 24 connected to the first dispersion cavity 2202, so as to ensure that the temperatures of the heat exchange tubes 24 connected to the first dispersion cavity 2202 are kept consistent. In other embodiments, the flue gas inlet pipe 22 can also be a larger pipe, and two opposing partition plates are provided inside the pipe to divide the internal space of the pipe into a first inlet cavity 2201 and a first dispersion cavity 2202. The lower part of the partition plate is the first inlet cavity 2201, and the upper part of the partition plate is the first dispersion cavity 2202. A gap is left between the partition plates to ensure the communication between the first inlet cavity 2201 and the first dispersion cavity 2202.

[0040] 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 53 is connected to the heating box 52. The flue gas supply pipe 53 sends the 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.

[0041] The temperature compensation pipe 23 is used to compensate the temperature of the flue gas therein. Both ends of the temperature compensation pipe 23 extend out of the furnace body 1. A flexible sealing ring 25 is arranged around the temperature compensation pipe 23. The flexible sealing ring 25 is used to seal the gap between the temperature compensation pipe 23 and the furnace body 1, so as to ensure that when the temperature compensation pipe 23 shakes following the heat exchanger 2, the flexible sealing ring 25 can deform to ensure that the temperature compensation pipe 23 and the furnace body 1 are always in a sealed state; The temperature compensation pipe 23 is connected with a burner 51, and the burner 51 is used to increase the temperature of the flue gas in the temperature compensation pipe 23 to ensure that the flue gas in the heat exchanger 2 is always within the design requirement range. The flexible sealing ring 25 can be made of high-temperature resistant refractory cloth or other refractory materials. The temperature compensation pipe 23 is connected with a flexible connecting pipe 55, so that it is convenient to connect the temperature compensation pipe 23 with the burner 51; In other words, when the flue gas inlet pipe 22 shakes following the heat exchanger 2, the burner 51 does not shake, and at the same time, the connection between the flexible connecting pipe 55 and the burner 51 can be ensured.

[0042] The temperature compensation tube 23 includes a second intake pipe body 231 and a second dispersion pipe body 232. The second dispersion pipe body 232 is installed on the second intake pipe body 231. The second intake pipe body 231 has a second intake cavity 2301, and the second dispersion pipe body 232 has a second dispersion cavity 2302. The heat exchange tube 24 above the temperature compensation tube 23 is installed on the second dispersion pipe body 232 and communicates with the second dispersion cavity 2302. The heat exchange tube 24 below the temperature compensation tube 23 is installed on the second intake pipe body 231 and communicates with the second intake cavity 2301. Through holes are provided on both the second intake pipe body 231 and the second dispersion pipe body 232, and the through hole on the second intake cavity 2301 is aligned with the through hole on the second dispersion cavity 2302, so that the second intake cavity 2301 and the second dispersion cavity 2302 are communicated. In this way, the flue gas in the heat exchange tube 24 below the temperature compensation tube 23 can enter from the second intake cavity 2301 into the second dispersion cavity 2302, and then enter the heat exchange tube 24 above the temperature compensation tube 23 for heat exchange. Both ends of the second intake cavity 2301 are air inlets, which increases the intake speed. The through hole of the second intake cavity 2301 is located in the middle of the second intake 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 flue gas is further provided in the second dispersion cavity 2302. The position of 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 the flue gas is dispersed by the second baffle 233 before entering the heat exchange tube 24 after entering the second dispersion cavity 2302, and the flue gas 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 temperatures of the heat exchange tubes 24 connected to the second dispersion cavity 2302 are kept consistent. According to different position heights of the temperature compensation tube 23, the heating device heats the flue gas to different temperatures to ensure the heat exchange requirements. In other embodiments, the temperature compensation tube 23 may also be a larger tube, and two opposing partition plates are provided inside the tube to divide the internal space of the tube into a second intake cavity 2301 and a second dispersion cavity 2302. The lower part of the partition plate is the second intake cavity 2301, and the upper part of the partition plate is the second dispersion cavity 2302. A gap is left between the partition plates to ensure the communication between the second intake cavity 2301 and the second dispersion cavity 2302.

[0043] The flue gas outlet pipe 21 is used to collect the flue gas after all heat exchanges are 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. A flexible sealing ring 25 is arranged around 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 following the heat exchanger 2, the flexible sealing ring 25 can deform, 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 with a flue gas collection pipe 54. The flue gas collection pipe 54 is used to collect flue gas, which is convenient for harmless treatment after the flue gas is concentrated. The flue gas outlet pipe 21 is connected with a flexible connecting pipe 55, so that it is convenient for the flue gas outlet pipe 21 and the flue gas collection pipe 54; In other words, when the flue gas outlet pipe 21 shakes following the heat exchanger 2, the flue gas collection pipe 54 will not shake, and at the same time, the connection between the flexible connecting pipe 55 and the flue gas collection pipe 54 can be ensured.

[0044] As Figures 7 to 10 shown, the heat exchange tube 24 includes a heat exchange tube 24 body and a plurality of heat exchange parts 242 arranged on the heat exchange tube 24 body. The heat exchange tube 24 body has a tube cavity for flue gas to flow through. The heat exchange parts 242 are arranged on the inner wall of the tube cavity, and the heat exchange parts 242 protrude towards the center of the tube cavity to increase the heat exchange area and ensure the heat absorption efficiency. 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 left and right in the tube cavity. An outer fin 243 is arranged on the outer wall of the heat exchange tube 24 body. The outer fin 243 is used to increase the heat exchange area, that is, to increase the contact area between the heat exchange tube 24 body and pulverized coal. Usually, four outer fins 243 are arranged. It is not suitable to arrange too many outer fins 243, because too many outer fins 243 are likely to cause pulverized coal to accumulate and finally cake, so as to prevent pulverized coal from caking.

[0045] The arc length of the heat exchange part 242 is less than the circular circumference of the tube cavity. Usually, the arc length of the heat exchange part 242 is set to half of the circular circumference of the tube cavity center. In this way, while ensuring a certain heat exchange effect, the flue gas can form a turbulent flow in the tube cavity. The turbulent flow can avoid the situation that always the same part of the flue gas contacts the heat exchange tube 24, that is, the temperature of the flue gas near the center of the tube cavity is not higher than the temperature of the flue gas near the inner wall of the tube cavity, and 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, there is no need to adopt a new process for processing, which can reduce the processing cost.

[0046] The heat exchange tube 24 body includes an upper tube body 2411, a misaligned tube body 2412, and a lower tube body 2413. A heat exchange portion 242 is provided 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 misaligned tube body 2412. The misaligned tube body 2412 is arranged obliquely, causing the upper tube body 2411 and the lower tube body 2413 to be misaligned, that is, the upper end of the heat exchange tube 24 is misaligned with the lower end of the heat exchange tube 24, realizing the misalignment of the heat exchange tube 24 in the vertical direction.

[0047] The heat exchange tube 24 itself can be misaligned in the vertical direction, and combined with the misaligned arrangement of adjacent rows of heat exchange tubes 24, it can make the pulverized coal evenly heated. At the same time, during the falling process, the pulverized coal becomes fluffy and is not easy to agglomerate. Compared with the simple layout of the conventional matrix arrangement without misalignment, the misaligned layout structure design of the heat exchange tube 24 in this application can achieve the same heat exchange effect while reducing the usage amount of the heat exchange tube 24 by half, and can also make the pulverized coal fluffy additionally.

[0048] As Figures 11 to 14 As shown, the gas collecting device 6a includes a first gas collector 61, a gas collecting box 62, and a gas exhaust pipe 63 for coal gas. The first gas collector 61 is installed on the furnace body 1. The gas collecting box 62 is installed outside the furnace body 1, and both ends of each first gas collector 61 extend outside the furnace body 1 and then extend into the gas collecting box 62. The first gas collector 61 is used to collect the coal gas in the cooling and gas collecting section of the furnace body 1. There are multiple first gas collectors 61, which are arranged in the horizontal direction, and adjacent first gas collectors 61 are misaligned in the vertical direction, that is, the first gas collectors 61 are arranged in sequence, one high and one low, in the horizontal direction to prevent the pulverized coal from agglomerating; the first gas collectors 61 in the upper and lower adjacent gas collecting devices 6a are misaligned in the horizontal direction to prevent the pulverized coal from agglomerating. The adjacent first gas collectors 61 are misaligned in both the vertical direction and the horizontal direction. During the falling process, the pulverized coal becomes fluffy and is not easy to agglomerate, and at the same time, the coal gas mixed in the pulverized coal can overflow more easily and be collected by the first gas collector 61. Compared with the simple layout of the conventional matrix arrangement without misalignment, the misaligned layout structure design of the first gas collector 61 in this application can achieve the same gas collecting effect while reducing the usage amount of the first gas collector 61. The gas exhaust pipe 63 for coal gas is installed on the gas collecting box 62. The gas exhaust pipe 63 for coal gas is used to connect the gas collecting boxes 62 at both ends of the first gas collector 61 and send the coal gas in the gas collecting box 62 into the external coal gas treatment system. The setting of the gas collecting box 62 and the gas exhaust pipe 63 for coal gas can reduce the pipelines connected to the external coal gas treatment system, facilitating troubleshooting and maintenance.

[0049] The first gas distributor 61 includes a distribution connecting pipe 611, a distribution box 612, and a pulverized coal baffle 613. The distribution connecting pipe 611 is installed on the furnace body 1, the distribution box 612 is installed on the distribution connecting pipe 611, the distribution box 612 is communicated with the connecting pipe, a gas passage is provided on the distribution box 612, the gas passage of the distribution box 612 is used for collecting coal gas, after the coal gas enters the distribution box 612, it enters the distribution connecting pipe 611, and finally enters the gas collecting box 62 from the distribution connecting pipe 611. The pulverized coal baffle 613 is installed on the distribution box 612, and the pulverized coal baffle 613 is used for blocking the pulverized coal from entering the gas passage to reduce the possibility of the pulverized coal entering the distribution box 612.

[0050] Specifically, the distribution box 612 is a rectangular box body. A first ventilation port 6121 and a second ventilation port 6122 are provided on the distribution box 612, and the first ventilation port 6121 and the second ventilation port 6122 form a gas passage. The first ventilation port 6121 is located on the side wall of the distribution box 612. There are multiple first ventilation ports 6121. Multiple rows of the first ventilation ports 6121 are arranged on each side wall of the distribution box 612, and there are multiple first ventilation ports 6121 in each row. In this way, the gas collection points can be increased as much as possible while ensuring the strength of the distribution box 612. Usually, the first ventilation port 6121 is set as a circle. Of course, in other embodiments, it can also be set as other shapes as long as the strength of the side wall of the distribution box 612 can be ensured. There are four pulverized coal baffles 613. Two pulverized coal baffles 613 are fixedly inclined on each side of the distribution box 612; the projection of the pulverized coal baffle 613 on the distribution box 612 can cover the first ventilation port 6121. The pulverized coal baffle 613 is inclined and covers the first ventilation port 6121 at the same time, so that a gas collection space is formed between the pulverized coal baffle 613 and the side wall of the distribution box 612. Pulverized coal cannot enter this gas collection space under the guiding action of the pulverized coal baffle 613. In this way, the pure pulverized coal content in the gas collected by the first ventilation port 6121 is extremely low, that is, pulverized coal can be prevented from entering the distribution box 612, and at the same time, the first ventilation port 6121 can be prevented from being blocked. Inclining the pulverized coal baffle 613 can also reduce the volume of a single first gas distributor 61, so that more first gas distributors 61 can be arranged at the same height. One pulverized coal baffle 613 can block two rows of the first ventilation ports 6121. In other embodiments, it can also block one row of the first ventilation ports 6121, which is set according to requirements. The second ventilation port 6122 is arranged along the length direction of the distribution box 612. The length of the second ventilation port 6122 is usually the same as the length of the distribution box 612, forming a gas collection surface. In this way, the gas collection area can be increased as much as possible. In this embodiment, the opening at the lower end of the rectangular box body is used as the second ventilation port 6122. Of course, in order to ensure the strength of the distribution box 612, reinforcing ribs can also be arranged in the distribution box 612 to increase the strength of the distribution box 612. In another embodiment, the second ventilation port 6122 can also be divided into multiple segments, and a partition is arranged between adjacent segments of the second ventilation port 6122, that is, the distribution box 612 is a box body with an opening at the upper end and a closed lower end, and a second ventilation port 6122 for ventilation is opened at the closed end of the lower end of the box body. The first ventilation port 6121 and the second ventilation port 6122 are distributed on different planes to form three-dimensional gas collection points, and the gas collection effect is good.

[0051] The centralized connection pipe 611 is a hollow pipe body. Both ends of the centralized connection pipe 611 are located inside the gas accumulation box 62. A communication opening 6111 is provided on the centralized connection pipe 611. The upper end of the centralized distribution box 612 is fixed at the communication opening 6111 of the centralized connection pipe 611, so that the centralized distribution box 612 is communicated with the centralized connection pipe 611.

[0052] The cooling device 6b includes a second gas distributor 64 and a gas distribution box 65. The second gas distributor 64 is installed inside the furnace body 1, and the gas distribution box 65 is installed outside the furnace body 1. Both ends of the second gas distributor 64 pass through the furnace body 1 and extend into the gas distribution box 65. The second gas distributor 64 is used to blow cooling gas into the furnace body 1 to cool the pulverized coal. There are multiple second gas distributors 64, which are arranged horizontally, and adjacent second gas distributors 64 are arranged in a staggered manner vertically, that is, the second gas distributors 64 are arranged in sequence horizontally, one high and one low, to prevent the pulverized coal from caking. The second gas distributors 64 in the adjacent cooling devices 6b up and down are arranged in a staggered manner horizontally to prevent the pulverized coal from caking. The second gas distributors 64 adjacent in the vertical direction and the horizontal direction are arranged in a staggered manner. During the falling process, the pulverized coal is fluffy and not easy to cake, and at the same time, the cooling gas can be mixed into the pulverized coal to improve the cooling effect. Compared with the simple layout of the conventional matrix arrangement without staggering, the staggered layout structure design of the second gas distributor 64 in this application can achieve the same cooling effect while reducing the usage amount of the second gas distributor 64. The gas distribution box 65 is connected with a gas supply pipe 66. The external cooling gas is sent into the gas distribution box 65 through the gas supply pipe 66. The gas distribution box 65 then distributes the cooling gas to the second gas distributor 64. The cooling gas is sent into the furnace body 1 through the second gas distributor 64 to cool the pulverized coal in the furnace body 1. The gas supply pipe 66 connects the gas distribution boxes 65 of multiple cooling devices 6b, and the external cooling gas is centrally sent through the gas supply pipe 66, which can reduce the pipes connected to the external cooling gas gas source and is convenient for troubleshooting and maintenance. The cooling gas uses cooled coal gas, so that the components of the coal gas collected by the gas collection device 6a will not increase, which is convenient for the subsequent treatment of the coal gas. The structure of the second gas distributor 64 is the same as that of the first gas distributor 61, referring to the structure description of the first gas distributor 61 above.

[0053] Such as Figures 15 to 17As shown in the figure, the discharge hopper 8 includes a material collecting hopper 81, a support hopper 82, fixing rods 83, and a pulverized coal baffle ring 84. The support hopper 82 is installed in the material collecting hopper 81 through the fixing rods 83. The support hopper 82 is used to install the power equipment of the discharger 7, that is, to provide an installation space and a support point for the power equipment of the discharger 7, prevent pulverized coal from entering the power equipment, and improve the service life of the power equipment. There are multiple fixing rods 83, and the fixing rods 83 are evenly distributed around the support hopper 82 to ensure higher stability of the connection between the support hopper 82 and the material collecting hopper 81. In order to further improve the connection stability, fixing rods 83 are provided at both the upper end and the lower end of the support hopper 82 to connect with the material collecting hopper 81. The pulverized coal baffle ring 84 is installed on the material collecting hopper 81. Of course, it can also be installed on the fixing rods 83, or both can be connected at the same time. The gap between the pulverized coal baffle ring 84 and the inner wall of the material collecting hopper 81 forms a gas collecting interlayer 80. The gas collecting interlayer 80 is used to collect the gas in the material collecting hopper 81. The upper end of the pulverized coal baffle ring 84 abuts against the inner wall of the material collecting hopper 81 to seal the upper end of the gas collecting interlayer 80, so as to reduce the possibility of pulverized coal entering the gas collecting interlayer 80. The gas collecting pipe 85 is installed on the material collecting hopper 81 and is communicated with the gas collecting interlayer 80. The gas collected by the gas collecting interlayer 80 is sent to an external gas treatment system through the gas collecting pipe 85. An inspection port 811 is provided on the material collecting hopper 81 to facilitate the inspection of the components inside the material collecting hopper 81. By setting the gas collecting interlayer 80 in the discharge hopper 8, the gas at the discharge end of the furnace body 1 can be collected, reducing the possibility of gas overflow.

[0054] After the pulverized coal enters the furnace body 1, it enters the dry distillation area. The pulverized coal is first preliminarily heated by the upper heat exchange tubes 24, then enters the middle heat exchange tubes 24 for secondary heating, and finally enters the lower heat exchange tubes 24 for final heating. 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. The traction member 33 drives the heat exchanger 2 to move up and down to realize the shaking of the heat exchanger 2. After heating, the pulverized coal enters the cooling and gas collecting section. During the falling process of the pulverized coal, the gas is separated from the pulverized coal and enters the distributed connection pipe 611 through the first ventilation port 6121 and the second ventilation port 6122. Then the gas enters the first gas collecting box 62 and then enters the gas exhaust pipe 63, and finally is sent to an external gas treatment system to complete the collection of the gas. While collecting the gas, an external gas source sends cooling gas into the gas distribution box 65 through the gas supply pipe 66. The gas distribution box 65 distributes the cooling gas to the second gas distributor 64. The cooling gas is sent into the furnace body 1 through the second gas distributor 64 to cool the pulverized coal in the furnace body 1. After cooling and gas collecting are completed, the pulverized coal is discharged into the discharge hopper 8 through the discharger 7. The discharge hopper 8 discharges the pulverized coal and collects a small amount of gas mixed in the pulverized coal at the same time, reducing the possibility of gas discharge.

[0055] The heat exchange tube 24 retains a heat exchange portion 242, which ensures the heat exchange effect. At the same time, the vertically adjacent heat exchange portions 242 are arranged oppositely, which can reduce the processing amount, lower the processing cost and thus reduce the procurement cost. Moreover, the oppositely arranged heat exchange portions 242 can also make the flue gas generate turbulence and flow in an S shape in the tube cavity, ensuring that the flue gas can uniformly heat the heat exchange tube 24 and maximizing the utilization of the heat energy of the flue gas. The heat exchanger is provided with a shaking function, which can prevent the pulverized coal from caking during heat exchange; at the same time, the heat exchange tube 24, the first gas distributor 61 and the second gas distributor 64 are arranged out of alignment both in the vertical direction and the horizontal direction, which can make the pulverized coal fluffy and not easy to cake during the falling process, and at the same time make the pulverized coal evenly heated during heating, evenly cooled during cooling, and can collect the coal gas to the greatest extent during gas collection; thus, the quality of the pulverized coal after low-temperature carbonization is ensured. Compared with the simple layout of the conventional matrix arrangement without misalignment, the misaligned layout design of the heat exchange tube 24, the first gas distributor 61 and the second gas distributor 64 in this application can achieve the same effect while reducing the usage amounts of the heat exchange tube 24, the first gas distributor 61 and the second gas distributor 64. In this way, the pulverized coal obtained by carbonization does not contain coal gas, and at the same time the pulverized coal does not cake, ensuring the quality of the pulverized coal after carbonization.

[0056] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structures made by using the content of the specification and drawings of the present invention, directly or indirectly applied in other related technical fields, are similarly within the patent protection scope of the present invention.

Claims

1. A low temperature upgrading furnace, characterized in that: The invention comprises a furnace body, a heat exchanger for heating pulverized coal in the furnace body, a shaking device for driving the heat exchanger to shake, a gas collecting device for collecting gas in the heated pulverized coal, a cooling device for cooling the heated pulverized coal, a discharger for discharging the cooled pulverized coal and a discharge hopper for receiving the pulverized coal discharged by the discharger, wherein the shaking device is connected to the heat exchanger, and the gas collecting device and the cooling device are located below the heat exchanger; the gas collecting device comprises a first gas collector for collecting gas, a gas collecting box and a gas exhaust pipe, wherein the first gas collector is arranged in a horizontal direction, and adjacent The first gas collectors are staggered in the vertical direction, and the first gas collectors in the upper and lower adjacent gas collectors are staggered in the horizontal direction. The gas collecting box is installed outside the furnace body, and both ends of each of the first gas collectors pass through the furnace body and extend into the gas collecting box. The coal gas exhaust pipe is installed on the gas collecting box to connect the gas collecting boxes at both ends of the first gas collectors; the cooling device includes a second gas collector and a gas distribution box for releasing cooling gas, the second gas collectors are arranged in the horizontal direction, and the adjacent second gas collectors are staggered in the vertical direction. The second gas collectors and distributors in the upper and lower adjacent cooling devices are staggered in the horizontal direction, the second gas collectors and distributors are installed in the furnace body, the gas distribution box is installed outside the furnace body, both ends of the second gas collectors and distributors pass through the furnace body and extend into the gas distribution box, the gas distribution box is connected to a gas supply pipe, and the external cooling gas is supplied to the gas distribution box through the gas supply pipe; the first gas collector and the second gas collector both include a collecting and distributing connecting pipe, a collecting and distributing box and a pulverized coal baffle, the collecting and distributing connecting pipe is installed on the furnace body, the collecting and distributing box is installed on the collecting and distributing connecting pipe, and the collecting and distributing The box is connected with the connecting pipe, a gas channel is arranged on the collecting and distributing box, and the gas channel of the collecting and distributing box is used to collect coal gas, the pulverized coal baffle is installed on the collecting and distributing box, and the pulverized coal baffle is inclinedly arranged on the collecting and distributing box, a first air vent and a second air vent are arranged on the collecting and distributing box, and the first air vent and the second air vent constitute a gas channel, the first air vent is located on the side wall of the collecting and distributing box, and the second air vent is located at the bottom of the collecting and distributing box; the discharger is installed on the furnace body, and the discharge hopper has a gas collecting interlayer, and the gas collecting interlayer is used to collect the coal gas in the gathering hopper.

2. The low temperature upgrading furnace according to claim 1, characterized in that: There are a plurality of the first vents, and a plurality of rows of the first vents are arranged on the side wall of each side of the collecting and distributing box.

3. The low temperature upgrading furnace according to claim 1, characterized in that: The discharge hopper includes a gathering hopper, a supporting hopper, a fixed rod and a pulverized coal retaining ring. The supporting hopper is installed in the gathering hopper through the fixed rod. The pulverized coal retaining ring is installed on the gathering hopper or the fixed rod. The gap between the pulverized coal retaining ring and the inner wall of the gathering hopper forms a gas collecting interlayer. The upper end of the pulverized coal retaining ring abuts against the inner wall of the gathering hopper. The upper end of the pulverized coal retaining ring abuts against the inner wall of the gathering hopper to close the upper end of the gas collecting interlayer.

4. The low temperature upgrading furnace according to claim 3, characterized in that: The aggregate hopper is provided with an inspection port.

5. The low temperature upgrading furnace 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.

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