CN111750664A - Rotary furnace with heat insulating plate - Google Patents

Rotary furnace with heat insulating plate Download PDF

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Publication number
CN111750664A
CN111750664A CN202010739234.3A CN202010739234A CN111750664A CN 111750664 A CN111750664 A CN 111750664A CN 202010739234 A CN202010739234 A CN 202010739234A CN 111750664 A CN111750664 A CN 111750664A
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CN
China
Prior art keywords
gas
furnace
tube
furnace tube
zone
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CN202010739234.3A
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Chinese (zh)
Inventor
曾宪秀
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Ganzhou Dingsheng Furnace Industry Co ltd
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Ganzhou Dingsheng Furnace Industry Co ltd
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Priority to CN202010739234.3A priority Critical patent/CN111750664A/en
Publication of CN111750664A publication Critical patent/CN111750664A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/02—Rotary-drum furnaces, i.e. horizontal or slightly inclined of multiple-chamber or multiple-drum type
    • F27B7/04—Rotary-drum furnaces, i.e. horizontal or slightly inclined of multiple-chamber or multiple-drum type with longitudinal divisions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/06—Rotary-drum furnaces, i.e. horizontal or slightly inclined adapted for treating the charge in vacuum or special atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/10—Rotary-drum furnaces, i.e. horizontal or slightly inclined internally heated, e.g. by means of passages in the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/34—Arrangements of heating devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/38—Arrangements of cooling devices

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)

Abstract

The invention provides a rotary furnace with a heat insulation plate, which comprises a feeding bin, a furnace body, a furnace tube, a discharging bin, a first gas filling part, a second gas filling part, an inner tube, a heat exchange tube and a heat insulation plate, wherein the direction of gas introduced into the furnace tube by the first gas filling part is consistent with the direction of powdery materials introduced into the furnace tube by the feeding bin; the gas introducing directions of the first gas adding part and the second gas adding part are opposite, the flow rate of the gas of the first gas adding part is larger than that of the gas of the second gas adding part, and the gas of the first gas adding part and the gas of the second gas adding part form a static area in the furnace tube; the inner pipe is arranged between the static area and the head of the furnace pipe, and the tail part of the inner pipe is provided with a filter screen; the heat exchange tube penetrates through the head of the furnace tube and is connected with the head of the inner tube, and the heat exchange tube penetrates through the first gas filling part; the heat insulation plate is positioned at the junction of the blanking area and the reduction area; the heating wire is longitudinally arranged inside the furnace body. The rotary furnace has the advantages of low energy consumption, high yield and the like.

Description

Rotary furnace with heat insulating plate
Technical Field
The invention relates to the field of thermal equipment, in particular to a rotary furnace with a heat insulation plate.
Background
The rotary kiln is a thermal apparatus for calcining, roasting or drying granular and powdery materials.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a conventional common rotary furnace, which includes an upper bin 100, a furnace tube 101, a hydrogenation portion 102, a lower bin 103, a recovery bin 104 and a furnace body 106, wherein the furnace tube 101 passes through the furnace body 106, a heating wire (not shown in fig. 1) for heating the furnace tube 101 is disposed inside the furnace body 106, the upper bin 100 and the lower bin 103 are respectively disposed at two ends of the furnace tube 101, the hydrogenation portion 102 and the lower bin 103 are disposed at the same side of the furnace tube 101, the recovery bin 104 and the upper bin 100 are disposed at the other side of the furnace tube 101, the furnace tube 101 is disposed in an inclined manner, and one end of the furnace tube 101, which is close to the upper bin 100, is higher than. Seen from the direction shown in fig. 1, the upper bin 100 is filled with powdery materials (such as tungsten trioxide) to be reduced from the right end of the furnace tube 101 to the inside thereof, the hydrogenation part 102 is filled with hydrogen from the left end of the furnace tube 101 to the inside thereof, the hydrogen is heated to about 500 ℃ by the hydrogen heater 105, the hydrogen and the powdery materials are subjected to reduction reaction in the furnace tube 101, the furnace tube 101 is heated to provide the temperature required by the reaction, the furnace tube 101 rotates along the axial direction thereof during the operation, and the powdery materials are reduced and then slide into the lower bin 103 along the furnace tube 101. In the working process of the rotary kiln, because the direction of hydrogen entering the furnace tube 101 is opposite to the direction of the powdery material entering the furnace tube 101, part of the powdery material moves to one end of the upper storage bin 100 under the action of the airflow of the hydrogen, and then the powdery material which flows back is recovered through the recovery bin 104.
However, such rotary kiln has the following drawbacks:
1. the energy consumption is high, the hydrogen introduced from the hydrogenation part 102 can reach the process temperature after being heated by the hydrogen heater 105, cold hydrogen is preheated to 500-600 ℃ and then enters the furnace tube, the cold hydrogen is heated to the reduction process temperature by the heating wires in the furnace body, a large amount of hydrogen carries a large amount of heat energy and is completely discharged out of the furnace after being reacted, so that the reduction energy consumption is extremely high, and the hydrogen flow of the rotary furnace is 400m3And the total power consumption is about 180 kw/h.
2. The heating wire in this rotary furnace adopts traditional "horizontal" arrangement, and the heater strip working process can be lost, needs to be changed after a period of time, and this kind of reducing furnace need shut down the operation when changing the heater strip, waits to open the bell after the furnace body cooling, gets into again and changes the heater strip in the furnace body, and it is very troublesome to change, needs to shut down the shut down, influences production efficiency, and a large amount of energy has still been wasted to the shut down in-process, has further increased the energy consumption.
3. The direct yield is low, and the yield of the rotary furnace is generally about 80-90 percent, because the flow direction of hydrogen is opposite to that of powdery materials, and the flying powder is taken out of the furnace by the large-flow hydrogen, so that the direct yield is low.
4. A large amount of powder carried by the discharged hydrogen needs to be recovered by a multi-stage dust removal device, so that the burden of equipment is increased, and the operation is complicated.
5. The reduction zone of the furnace tube is directly communicated with the blanking zone, and the heat of the reduction zone is radiated to the blanking zone, so that the reduction product is not cooled, and the energy consumption is increased.
Disclosure of Invention
The invention aims to provide a rotary furnace with a heat insulation plate, which has low energy consumption and high yield and is easy to replace a heating wire.
In order to achieve the above object, the present invention provides a rotary furnace with a thermal insulation board, including an upper bin, a furnace body, a furnace tube and a lower bin, wherein the furnace tube passes through the furnace body, a heating wire for heating the furnace tube is arranged in the furnace body, the upper bin is arranged at the head of the furnace tube, the lower bin is arranged at the tail of the furnace tube, a pre-mixing zone is formed between the head of the furnace tube and the furnace body in the furnace tube, a discharging zone is formed between the tail of the furnace tube and the furnace body in the furnace tube, and a reduction zone is arranged between the pre-mixing zone and: the first gas filling part is arranged at the head of the furnace tube, and the direction of gas introduced into the furnace tube by the first gas filling part is consistent with the direction of powdery material introduced into the furnace tube by the upper storage bin; the second gas filling part is arranged at the tail part of the furnace tube, the direction of gas introduced into the furnace tube by the first gas filling part is opposite to the direction of gas introduced into the furnace tube by the second gas filling part, the flow rate of the gas in the first gas filling part is greater than that of the gas in the second gas filling part, and the gas introduced into the furnace tube by the first gas filling part and the gas introduced into the furnace tube by the second gas filling part form a static region in the furnace tube; the inner pipe is arranged in the furnace pipe, the inner pipe is arranged between the static area and the head of the furnace pipe, and the tail part of the inner pipe is provided with a filter screen; the heat exchange tube penetrates through the head of the furnace tube and is connected with the head of the inner tube, the heat exchange tube penetrates through the first gas adding part, and gas in the first gas adding part enters the furnace tube after exchanging heat with the heat exchange tube; the heat insulation plate is arranged in the furnace tube, the heat insulation plate and the furnace tube are coaxially arranged, a gap is formed between the heat insulation plate and the furnace tube, and the heat insulation plate is positioned at the junction of the blanking area and the reduction area; wherein, a multi-stage temperature zone is arranged in the furnace body; the heating wire is longitudinally arranged inside the furnace body.
According to the technical scheme, the gas introducing directions of the first gas adding part and the second gas adding part are opposite, a static area is formed in the furnace tube, so that floating metal powder is deposited in the static area and slides along the inner wall of the furnace tube, and the filter screen is arranged at the tail part of the inner tube, so that the metal powder is prevented from being taken out of the furnace tube, the yield is greatly improved, and the direct yield of products of the rotary furnace can be improved by over 10 percent; the gas in the first gas adding part enters the furnace tube after exchanging heat with the heat exchange tube, so that the gas temperature of the first gas adding part is improved, a gas heater is not required to be additionally arranged, meanwhile, the heat brought out by the gas discharged out of the furnace tube is reduced, and the energy consumption is greatly reduced; because only a small amount of metal powder is brought out of the furnace tube, a dust removal device is not needed for recovery, and the equipment is simplified; the heating wires are longitudinally arranged in the furnace body and can be directly taken out from the top of the furnace body, the replacement is very convenient, the shutdown operation is not needed, and the production efficiency is improved; the heat insulation plate is arranged between the reduction area and the blanking area, so that the radiation intensity of heat of the reduction area to the blanking area is greatly reduced, the heat loss of the reduction area is reduced, the energy consumption is further reduced, the temperature of the blanking area is reduced, and the reduction product is cooled.
The utility model has the advantages of the heating furnace is simple in structure, convenient to use, the installation hole has been seted up at the top of furnace body, the top of installation hole is provided with insulating magnetic gasket, be provided with fixed orifices and first through wires hole and second through wires hole on the insulating magnetic gasket, the both ends of heater strip are connected with positive electrode terminal bar and negative electrode terminal bar respectively, the upper end and a dead lever of heater strip are connected, the dead lever passes to be connected with the outer fixation nut of insulating magnetic gasket after the fixed orifices, positive electrode terminal bar passes to be connected with the outer first terminal nut of insulating magnetic gasket after the first through wires hole, the negative electrode terminal bar passes to be connected with the outer second terminal nut of insulating magnetic gasket after the second through wires hole.
Therefore, through the arrangement of the insulating magnetic gasket, heat loss is reduced, energy consumption is further reduced, and when the heating wire is replaced, the heating wire can be taken out together only by taking out the insulating magnetic gasket, so that the operation is simple.
The further scheme is that the insulating magnetic gasket is cylindrical, an annular step part is arranged at the bottom of the insulating magnetic gasket, the top surface of the annular step part abuts against the top surface of the furnace body, an external thread is arranged on the side surface of the annular step part, an internal thread is arranged on the peripheral wall of the upper end of the mounting hole, and the external thread on the side surface is matched with the internal thread of the mounting hole.
Therefore, the installation stability of the insulating magnetic gasket is improved and the installation is convenient by arranging the annular step part.
The further scheme is that the fixing hole is formed in the axis of the insulating magnetic gasket, and the first threading hole and the second threading hole are symmetrically formed in two sides of the second fixing hole.
Therefore, the first fixing hole and the third fixing hole are symmetrically arranged on two sides of the second fixing hole, so that the stability of the heating wire installed on the insulating magnetic gasket can be improved.
The further scheme is that the multistage temperature zone sequentially comprises a one-zone temperature zone, a two-zone temperature zone, a three-zone temperature zone, a four-zone temperature zone, a five-zone temperature zone and a six-zone temperature zone.
The further proposal is that a heat insulation part is arranged between the adjacent temperature zones, and a gap is reserved between the heat insulation part and the outer wall of the furnace tube.
Therefore, the heat conduction between the adjacent temperate zones is reduced by arranging the heat insulation part, and the stability of the temperature in each temperate zone is favorably kept.
The further proposal is that the static area is positioned at the junction of the four-zone temperature area and the five-zone temperature area.
The further scheme is that the first gas filling part is a tube type heat exchanger. The shell and tube heat exchanger can improve the heat exchange efficiency.
The further proposal is that the flow rate of the gas introduced into the first gas filling part is 200-600m3H, the flow rate of the gas introduced into the second gas filling part is 30-100m3/h。
In a further scheme, the flow rate of the gas introduced into the first gas filling part is 0.1-0.5m/s, and the flow rate of the gas introduced into the second gas filling part is 0.03-0.1 m/s.
Drawings
FIG. 1 is a schematic view showing the structure of a conventional rotary kiln.
FIG. 2 is a schematic structural view of an embodiment of the rotary kiln of the present invention.
Fig. 3 is an enlarged view of a portion a of fig. 2.
Fig. 4 is a sectional view taken in the direction B-B in fig. 2.
Fig. 5 is an enlarged view of a structure of a portion D in fig. 4.
FIG. 6 is a plan view of an insulating magnetic spacer of an embodiment of a rotary kiln of the present invention.
FIG. 7 is a front view of an insulating magnetic spacer of an embodiment of a rotary kiln of the present invention.
FIG. 8 is a plan view of a furnace body of an embodiment of a rotary kiln of the present invention.
Fig. 9 is a sectional view taken in the direction C-C in fig. 2.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Referring to fig. 2, fig. 2 is a schematic structural view of an embodiment of the energy-efficient rotary kiln of the present invention. In this embodiment, the rotary kiln comprises a feeding bin 1, a furnace body 2, a furnace tube 3, a discharging bin 4, a first gas filling part 5, a second gas filling part 6, an inner tube 7 and a heat exchange tube 8, and the rotary kiln is used for reducing a powdery material WO3The concrete description is given by way of example. Powdery material WO3Placing in an upper bin 1, adding powdery material WO into a furnace tube 3 from the upper bin 13And the reduced product enters a discharging bin 4 for collection. The feeding bin 1 is arranged at the head part of the furnace tube 3, and the discharging bin 4 is arranged at the tail part of the furnace tube 3. In the invention, the end close to the feeding is the head of the furnace tube 3, and the end close to the discharging is the tail of the furnace tube 3. Furnace tube 3 dipThe furnace tube 3 is obliquely arranged, the head part of the furnace tube 3 is higher than the tail part of the furnace tube 3, the inclination angle of the furnace tube 3 is 2-5 degrees, and the furnace tube 3 axially rotates in the working process so that the powdery material WO3Slides from the head of the furnace body 2 to the tail of the furnace body 2.
The furnace tube 3 penetrates through the furnace body 2, a heating wire for heating the furnace tube is arranged in the furnace body 2, a premixing area 30 is formed between the head of the furnace tube 3 and the furnace body 2 in the furnace tube 3, a blanking area 31 is formed between the tail of the furnace tube 3 and the furnace body 2 in the furnace tube 3, and a reduction area 32 is formed between the premixing area 30 and the blanking area 31. The hydrogen gas added into the furnace tube 3 by the first gas adding part 5 and the powdery material WO added into the furnace tube 3 by the feeding bin 13After being premixed in the premixing area 30, the mixture enters the reduction area 32 for reduction, and then enters the blanking area 31 for blanking from the blanking bin 4.
The furnace body 2 sequentially comprises an area-heating zone 21, a two-area-heating zone 22, a three-area-heating zone 23, a four-area-heating zone 24, a five-area-heating zone 25 and a six-area-heating zone 26 from the head to the tail, and the area-heating zone 21, the two-area-heating zone 22, the three-area-heating zone 23, the four-area-heating zone 24, the five-area-heating zone 25 and the six-area-heating zone 26 form a multi-stage. In this embodiment, the temperature of the one-band temperature zone 21 is 630 ℃, the temperature of the two-band temperature zone 22 is 650 ℃, the temperature of the three-band temperature zone 23 is 700 ℃, the temperature of the four-band temperature zone 24 is 750 ℃, the temperature of the five-band temperature zone 25 is 960 ℃, and the temperature of the six-band temperature zone 26 is 1000 ℃.
The inner tube 7 is disposed within the furnace tube 3, the inner tube 7 extending from the four-zone temperature zone 24 to the premixing zone 30.
The heat exchange tube 8 penetrates through the head of the furnace tube 3 and is connected with the head of the inner tube 7, the heat exchange tube 7 penetrates through the first gas adding part 5, and hydrogen introduced into the first gas adding part 5 and the heat exchange tube 8 enter the furnace tube 3 after heat exchange.
In this embodiment, the flow rate of the hydrogen introduced into the first gas adding part 5 is 350m3The gas flow rate is 0.3m/s, the initial temperature of the gas is 20 ℃, and the temperature of the heat exchange gas passing through the heat exchange tube 8 can reach 400-500 ℃. The flow of the hydrogen introduced into the second gas adding part 6 is 60m3The gas flow rate was 0.06m/s and the initial temperature of the gas was 20 ℃. In other embodiments, the flow rate and flow rate of the hydrogen fed into the first gas adding part 5 and the second gas adding part 6 can be adjusted, and the first gas adding part is generally controlledThe flow of the gas introduced into the gas filling part is 200-600m3The flow velocity of the gas is 0.1-0.5 m/s; the flow rate of the gas introduced into the second gas filling part is 30-100m3The flow rate of the gas is 0.03-0.1 m/s.
The operation of the rotary kiln of the present invention will be described in detail with reference to fig. 2 and 3, and fig. 3 is an enlarged view of a portion a of fig. 2.
The feeding bin 1 adds powdery material WO into the furnace tube 33The first gas filling part 5 adds hydrogen and metal powder WO into the furnace tube 33The hydrogen and the hydrogen are premixed in a premixing area 30 and then enter a reduction area 32, a furnace body 2 heats a furnace tube 3, the temperature of a temperature-zone 21 is raised to 630 ℃, the temperature of a temperature-zone 22 is raised to 650 ℃, the temperature of a temperature-zone 23 is raised to 700 ℃, the temperature of a temperature-zone 24 is raised to 750 ℃, the temperature of a temperature-zone 25 is raised to 960 ℃, the temperature of a temperature-zone 26 is raised to 1000 ℃, and the temperature of the metal powder WO is heated3Fully reacting with hydrogen in a reduction zone 32 through a multi-stage temperature zone at different temperatures to obtain a reduction product tungsten powder (the main component is WO)2). When the first gas filling part 5 is filled with hydrogen, the second gas filling part 6 is filled with hydrogen from the tail part of the furnace tube 3 to the interior of the furnace tube, and the hydrogen filled in by the second gas filling part 6 firstly passes through the blanking region 31 to cool the tungsten powder of the reduction product, so that the tungsten powder is prevented from being oxidized at high temperature and then enters the reduction region 32. The hydrogen introduced by the first gas adding part 5 and the hydrogen introduced by the second gas adding part 6 form a static area 34 in the furnace tube 3 due to the opposite gas flow directions, and in this embodiment, the static area 34 is located at the junction of the four-zone temperature zone 24 and the five-zone temperature zone 25. The inner tube 7 is arranged between the static area 34 and the head of the furnace tube 3, the tail of the inner tube 7 is provided with the filter screen 70, the mixed gas of unreacted hydrogen and steam enters the inner tube 7 from the tail of the inner tube 7, the metal powder is blocked outside the inner tube 7 by the filter screen 70, then the mixed gas enters the heat exchange tube 8 from the head of the inner tube 7, the mixed gas contains a large amount of heat, and after the heat exchange tube 8 exchanges heat with the first gas adding part 5, the hydrogen introduced into the first gas adding part 5 can be heated to 400-500 ℃, so that the hydrogen introduced into the first gas adding part 5 is converted into hot hydrogen. In order to improve the heat exchange efficiency, the first air adding part 5 can adopt a tubular heat exchangerThe installation method can refer to the prior art, and is not described herein again.
In the process of reducing the metal powder, the high-efficiency energy-saving rotary furnace of the invention deposits the floating metal powder and slides along the inner wall of the furnace tube because a static area is formed in the furnace tube, and prevents the metal powder from being taken out of the furnace tube because the tail part of the inner tube is provided with the filter screen, thereby greatly improving the yield, and the product yield of the rotary furnace adopting the invention can reach more than 99 percent.
In order to improve the heat insulation effect between the adjacent temperature zones, the present invention is provided with a heat insulation portion 27 between the four-zone temperature zone 24 and the five-zone temperature zone 25. A gap is left between the heat insulation part 27 and the outer wall of the furnace tube 3 to ensure that the furnace tube 3 can rotate freely. The heat insulating portion 27 limits heat exchange between the four-band temperature zone 24 and the five-band temperature zone 25, facilitating temperature control. The heat insulation parts which are the same as the heat insulation parts 27 are arranged between a first temperature zone 21 and a second temperature zone 22, between the second temperature zone 22 and a third temperature zone 23, between the third temperature zone 23 and a fourth temperature zone 24, and between a fifth temperature zone 25 and a sixth temperature zone 26, so that the heat insulation effect between the adjacent temperature zones is improved.
Referring to fig. 4, fig. 4 is a sectional view taken in the direction B-B of fig. 2. In order to heat the furnace tube 3, a heating wire 9 is arranged inside the furnace body 2, and the heating wire 9 is longitudinally arranged in the furnace body 2. The top of the furnace body 2 is provided with a mounting hole 200, the heating wire 9 passes through the mounting hole 200 and then is hung in the furnace body 2, the upper end of the heating wire 9 is connected with a fixed rod 10, and the two ends of the heating wire 9 are respectively connected with a positive electrode wire connecting rod 11 and a negative electrode wire connecting rod 12. Referring to fig. 5, 6 and 7 together, fig. 5 is an enlarged view of a portion D of fig. 4, fig. 6 is a plan view of an insulating magnetic spacer of an embodiment of a rotary kiln of the present invention, and fig. 7 is a front view of the insulating magnetic spacer of the embodiment of the rotary kiln of the present invention. The top of mounting hole 200 is provided with insulating magnetic gasket 201, and in this embodiment, insulating magnetic gasket 201 is cylindrical, and the bottom of insulating magnetic gasket 201 is provided with annular step portion, and the top surface 202 butt of annular step portion is at the top surface of furnace body 2, is provided with the external screw thread on the side 203 of annular step portion, is provided with the internal thread on the upper end perisporium of mounting hole 200, and the external screw thread of side 203 cooperates with the internal thread of mounting hole 200 and installs insulating magnetic gasket 201 detachable in mounting hole 200. Three through holes are arranged on the insulating magnetic gasket 201 at intervals: a first threading hole 204, a fixing hole 205, and a second threading hole 206, in this embodiment, the fixing hole 205 is disposed on the axis of the insulating magnetic gasket 201, and the first threading hole 204 and the second threading hole 206 are symmetrically disposed on two sides of the fixing hole 205. The positive electrode wire connecting rod 11 passes through the first wire threading hole 204 and then is connected with a first wire connecting nut 13 arranged outside the insulating magnetic gasket 201; the fixing rod 10 passes through the fixing hole 205 and then is connected with a fixing nut 14 arranged outside the insulating magnetic gasket 201; the negative electrode wire connecting rod 12 passes through the second wire threading hole 206 and then is electrically connected with a second wire connecting nut 15 arranged outside the insulating magnetic gasket 201, and the positive electrode wire connecting rod 11 and the negative electrode wire connecting rod 12 are respectively electrically connected with an external circuit.
According to the high-efficiency energy-saving type rotary furnace heating wire, by the installation method, when the heating wire 9 needs to be replaced, the whole heating wire 9 can be taken out only by rotating the insulating magnetic gasket 201 from the top installation hole 200 of the furnace body 2, and compared with the existing furnace body structure with the heating wire installed transversely, the heating wire is more convenient to replace. When the heating wire is replaced, the furnace body structure with the heating wire installed transversely needs to be shut down firstly and the like for cooling the furnace body, then the furnace cover is opened, then the heating wire is taken out, and the replacement period is long.
Referring to fig. 8, fig. 8 is a plan view of a furnace body of an embodiment of the energy-efficient rotary furnace of the present invention, and for the sake of convenience of illustration, fig. 8 omits other repeated temperature zones of the furnace body, and only maintains a structure of a temperature zone. In this embodiment, two rows of heating wires are disposed in the furnace body 2, and the two rows of heating wires are disposed on two sides of the furnace tube 3 along the length extending direction of the furnace body 2. The top of the furnace body 2 is sequentially provided with a first insulating magnetic gasket 2011, a second insulating magnetic gasket 2012, a third insulating magnetic gasket 2013 and a fourth insulating magnetic gasket 2014, and the structures of the first insulating magnetic gasket 2011, the second insulating magnetic gasket 2012, the third insulating magnetic gasket 2013 and the fourth insulating magnetic gasket 2014 are the same as the structure of the insulating magnetic gasket 201. A first heating wire (invisible in fig. 8, refer to the structure of fig. 5) is installed in the furnace body 2 through a first insulating magnetic gasket 2011, a second heating wire (invisible in fig. 8, refer to the structure of fig. 5) is installed in the furnace body 2 through a second insulating magnetic gasket 2012, a third heating wire (invisible in fig. 8, refer to the structure of fig. 5) is installed in the furnace body 2 through a third insulating magnetic gasket 2013, and a fourth heating wire (invisible in fig. 8, refer to the structure of fig. 5) is installed in the furnace body 2 through a fourth insulating magnetic gasket 2014. The first positive terminal 1101 of the first heating wire is electrically connected with the positive electrode of the external circuit, the first negative terminal 1201 of the first heating wire is electrically connected with the second positive terminal 1102 of the second heating wire, the second negative terminal 1202 of the second heating wire is electrically connected with the third positive terminal 1103 of the third heating wire, the third negative terminal 1203 of the third terminal is electrically connected with the fourth positive terminal 1104 of the fourth heating wire, the fourth negative terminal 1204 of the fourth heating wire is electrically connected with the negative electrode of the external circuit, the first heating wire, the second heating wire, the third heating wire and the fourth heating wire are connected in series through the wiring mode, after the external circuit is connected, the first heating wire, the second heating wire, the third heating wire and the fourth heating wire generate heat after passing through current, and the furnace tube 2 is heated.
Referring to fig. 9, fig. 9 is a sectional view taken in the direction of C-C in fig. 2. Referring to fig. 2, the heat insulation plate 16 is arranged in the furnace tube 3 of the rotary furnace of the invention, the heat insulation plate 16 is arranged coaxially with the furnace tube 3, the section of the heat insulation plate 16 is circular, the diameter of the heat insulation plate 16 is smaller than the inner diameter of the furnace tube 3, and a gap is formed between the heat insulation plate 16 and the furnace tube 3. The heat insulation plate 16 is fixed at the junction of the blanking area 31 and the reduction area 32 through a support column 17. Preferably, the number of the supporting columns 14 is four, and four supporting columns 14 are arranged between the heat insulation plate 16 and the furnace tube 3 at intervals along the circumferential direction of the heat insulation plate 16.
The heat insulation plate 16 effectively prevents the heat in the reduction region 32 from transferring into the blanking region 31, so that the heat loss in the reduction region 32 is reduced, the temperature in the blanking region 31 is reduced, and the reduction products are cooled through the blanking region 31.
Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various changes and modifications can be made in the present invention, for example, when a rotary kiln is used for drying materials, nitrogen gas is introduced into a furnace tube through a first gas injection part and a second gas injection part; any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A rotary furnace with a heat insulation plate comprises an upper storage bin, a furnace body, a furnace tube and a lower storage bin, wherein the furnace tube penetrates through the furnace body, a heating wire for heating the furnace tube is arranged in the furnace body, the upper storage bin is arranged at the head of the furnace tube, and the lower storage bin is arranged at the tail of the furnace tube;
further comprising:
the first gas filling part is arranged at the head of the furnace tube, and the direction of gas introduced into the furnace tube by the first gas filling part is consistent with the direction of powdery material introduced into the furnace tube by the feeding bin;
the second gas filling part is arranged at the tail part of the furnace tube, the direction of gas introduced into the furnace tube by the first gas filling part is opposite to the direction of gas introduced into the furnace tube by the second gas filling part, the flow rate of the gas in the first gas filling part is greater than that of the gas in the second gas filling part, and the gas introduced into the furnace tube by the first gas filling part and the gas introduced into the furnace tube by the second gas filling part form a static region in the furnace tube;
the inner pipe is arranged in the furnace pipe, the inner pipe is arranged between the static area and the head of the furnace pipe, and the tail of the inner pipe is provided with a filter screen;
the heat exchange tube penetrates through the head of the furnace tube and is connected with the head of the inner tube, the heat exchange tube penetrates through the first gas adding part, and gas in the first gas adding part enters the furnace tube after exchanging heat with the heat exchange tube;
the heat insulation plate is arranged in the furnace tube, the heat insulation plate and the furnace tube are coaxially arranged, a gap is formed between the heat insulation plate and the furnace tube, and the heat insulation plate is positioned at the junction of the blanking area and the reduction area;
wherein, a multi-stage temperature zone is arranged in the furnace body;
the heating wire is longitudinally arranged inside the furnace body.
2. The rotary kiln as defined in claim 1, wherein:
the heating furnace is characterized in that a mounting hole is formed in the top of the furnace body, an insulating magnetic gasket is arranged on the top of the mounting hole, a fixing hole, a first threading hole and a second threading hole are formed in the insulating magnetic gasket, two ends of the heating wire are respectively connected with a positive electrode wiring rod and a negative electrode wiring rod, the upper end of the heating wire is connected with a fixing rod, the fixing rod penetrates through the fixing hole and then is connected with a fixing nut outside the insulating magnetic gasket, the positive electrode wiring rod penetrates through the first threading hole and then is connected with the first wiring nut outside the insulating magnetic gasket, and the negative electrode wiring rod penetrates through the second threading hole and then is connected with a second wiring nut outside the insulating magnetic gasket.
3. The rotary kiln as defined in claim 2, wherein:
the insulating magnetic gasket is cylindrical, an annular step part is arranged at the bottom of the insulating magnetic gasket, the top surface of the annular step part abuts against the top surface of the furnace body, external threads are arranged on the side surface of the annular step part, internal threads are arranged on the peripheral wall of the upper end of the mounting hole, and the external threads on the side surface are matched with the internal threads of the mounting hole.
4. The rotary kiln as defined in claim 2, wherein:
the fixing hole is formed in the axis of the insulating magnetic gasket, and the first threading hole and the second threading hole are symmetrically formed in two sides of the second fixing hole.
5. The rotary kiln according to any one of claims 1 to 4, wherein:
the multistage temperature zone sequentially comprises an one-zone temperature zone, a two-zone temperature zone, a three-zone temperature zone, a four-zone temperature zone, a five-zone temperature zone and a six-zone temperature zone.
6. The rotary kiln as defined in claim 5, wherein:
a heat insulation part is arranged between the adjacent temperature zones, and a gap is reserved between the heat insulation part and the outer wall of the furnace tube.
7. The rotary kiln as defined in claim 6, wherein:
the static area is located at the junction of the four-zone temperature area and the five-zone temperature area.
8. The rotary kiln as defined in claim 1, wherein:
the first gas filling part is a tube type heat exchanger.
9. The rotary kiln as defined in claim 1, wherein:
the flow of the gas introduced into the first gas adding part is 200-600m3The flow rate of gas introduced into the second gas filling part is 30-100m3/h。
10. The rotary kiln as defined in claim 9, wherein:
the flow rate of gas introduced into the first gas filling part is 0.1-0.5m/s, and the flow rate of gas introduced into the second gas filling part is 0.03-0.1 m/s.
CN202010739234.3A 2020-07-28 2020-07-28 Rotary furnace with heat insulating plate Pending CN111750664A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010739234.3A CN111750664A (en) 2020-07-28 2020-07-28 Rotary furnace with heat insulating plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010739234.3A CN111750664A (en) 2020-07-28 2020-07-28 Rotary furnace with heat insulating plate

Publications (1)

Publication Number Publication Date
CN111750664A true CN111750664A (en) 2020-10-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010739234.3A Pending CN111750664A (en) 2020-07-28 2020-07-28 Rotary furnace with heat insulating plate

Country Status (1)

Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113405367A (en) * 2021-06-22 2021-09-17 四川长虹格润环保科技股份有限公司 Lithium battery recovery powder reduction equipment and ternary lithium battery recovery powder reduction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113405367A (en) * 2021-06-22 2021-09-17 四川长虹格润环保科技股份有限公司 Lithium battery recovery powder reduction equipment and ternary lithium battery recovery powder reduction method
CN113405367B (en) * 2021-06-22 2023-05-23 四川长虹格润环保科技股份有限公司 Lithium battery recycling powder reduction equipment and ternary lithium battery recycling powder reduction method

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