CN216049078U

CN216049078U - Rotary furnace for roasting lithium iron phosphate serving as lithium ion battery anode material

Info

Publication number: CN216049078U
Application number: CN202122372745.9U
Authority: CN
Inventors: 周大桥; 丁罡; 金善龙
Original assignee: Henan Baili New Energy Material Co Ltd
Current assignee: Henan Baili New Energy Material Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-03-15
Anticipated expiration: 2031-09-27

Abstract

The utility model relates to a rotary furnace for roasting lithium iron phosphate serving as a lithium ion battery anode material in the technical field of rotary furnaces, which comprises a furnace body and an inner cylinder, wherein the inner cylinder is rotatably arranged in the furnace body, the furnace body is sequentially divided into a temperature rising section, a heat preservation section and a temperature reduction section along a discharging direction, the temperature rising section and the heat preservation section are respectively provided with a heating assembly, the temperature reduction section is provided with a cooling assembly, the bottom of the furnace body is connected with a telescopic supporting leg, the feeding end of the furnace body is connected with a feeding bin, the feeding bin is communicated with a feeding hole of the inner cylinder, the inner cylinder is communicated with a nitrogen pipeline, and the inner wall of the inner cylinder is fixedly provided with an inner lining and a plurality of lifting blades. The utility model has reasonable structure, and all the components are mutually matched, so that the roasting material can be efficiently and uniformly roasted; the rotary furnace has high temperature rise speed, good thermal stability, small use power, more energy conservation and reduced production cost; the material roasting does not need a sagger loaded with the material, and the inner cylinder adopts a graphite material as a lining, so that the risk of introducing magnetic foreign matters in the roasting process is avoided, and the product roasting quality is improved.

Description

Rotary furnace for roasting lithium iron phosphate serving as lithium ion battery anode material

Technical Field

The utility model relates to the technical field of rotary furnaces, in particular to a rotary furnace for roasting lithium iron phosphate serving as a lithium ion battery anode material.

Background

In the process of roasting and processing the material, the rotary furnace belongs to a dynamic roasting furnace, and compared with the roasting mode of a static roasting furnace, the rotary furnace can overcome the defects of under-burning, over-burning, half-burning and the like generated in the process of roasting the powder material, thereby reducing the roasting reaction time of the powder material and improving the quality uniformity of the product in roasting. In the prior art, the lithium iron phosphate serving as the cathode material of the lithium ion battery has the defects of low temperature rise speed, poor thermal stability and high energy consumption during roasting, and magnetic foreign matters are easily introduced in the roasting process, so that the roasting quality is influenced.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a rotary furnace for roasting lithium iron phosphate as a lithium ion battery anode material, which comprises a furnace body and an inner cylinder, wherein the inner cylinder is rotatably arranged in the furnace body, the inner cylinder is connected with a rotating motor, the inner wall of the furnace body is provided with a heat preservation layer, the furnace body is sequentially divided into a temperature rising section, a heat preservation section and a temperature reduction section along the discharging direction, the temperature rising section and the heat preservation section are provided with heating components, the temperature reduction section is provided with a cooling component, the bottom of the furnace body is connected with a telescopic supporting leg,

the feed end of furnace body is connected with the feeding storehouse, the discharge gate department in feeding storehouse is equipped with the screw feeder, the discharge end of screw feeder and the feed inlet intercommunication of inner tube, the inner tube intercommunication has nitrogen gas pipeline, is fixed with the inside lining on the inner wall of inner tube, along a plurality of lifting blades of circumference evenly distributed on the inside lining.

Preferably, heating element includes gas pipeline, air conduit and a plurality of combustor, be equipped with gas pressure regulating valves and gas pressure gauge on the gas pipeline, be equipped with air inlet fan on the air conduit, a plurality of combustors evenly distributed on section and the heat preservation section of heating, each combustor and gas pipeline and air conduit intercommunication, gas pipeline and air conduit all are equipped with the governing valve with the intercommunication department of each combustor, the nozzle of combustor runs through the furnace body and stretches into between inner tube and the furnace body, the top intercommunication of furnace body has the tuber pipe of discharging fume, be equipped with smoke exhaust fan on the tuber pipe of discharging fume.

Preferably, the cooling assembly comprises a water-cooling jacket, the water-cooling jacket is fixed on the inner wall of the furnace body between the furnace body and the inner cylinder of the cooling section, and the water-cooling jacket is provided with a cooling water inlet and a cooling water outlet.

Preferably, the lining is a graphite lining or a silicon carbide lining.

Preferably, the supporting legs are foundation bolts or electric push rods or air cylinders.

Preferably, the feed inlet of inner tube stretches out outside the furnace body, is located the outer inner tube of furnace body and is connected with the rotation motor, the feed inlet and the inner tube coaxial line of inner tube, the feed inlet of inner tube pass through the bearing and rotate and connect the inlet pipe, the discharge end intercommunication of inlet pipe and screw feeder, nitrogen gas pipeline and inlet pipe intercommunication, the discharge gate of inner tube and the feed opening of furnace body correspond the cooperation each other.

The utility model also comprises other components which can ensure that the rotary furnace for roasting the lithium iron phosphate anode material of the lithium ion battery is normally used, such as a control component of a spiral feeder, a control component of a rotating motor, a control component of an air inlet fan, a control component of an adjusting valve, a control component of a burner, a control component of a smoke exhaust fan, a control component of an electric push rod, a control component of an air cylinder, a control component of a gas pressure regulating valve group and the like, which are conventional technical means in the field. In addition, devices or components which are not limited in the utility model all adopt conventional technical means in the field, and for example, a gas pressure regulating valve group, an electric push rod, a cylinder, a burner, a gas pressure gauge, a regulating valve, a lifting blade, a spiral feeder, a water cooling jacket and the like are conventional equipment in the field.

The working principle of the utility model is that the powder material in the previous procedure enters a feeding bin, and uniformly enters an inner cylinder for roasting through a spiral feeder, when the material is roasted in the inner cylinder in a rotating and moving way, high-purity nitrogen is introduced into the inner cylinder, and under the action of a burner and a burner, gas is continuously combusted, so that a temperature rising section and a heat preservation section are continuously heated, the temperature in the inner cylinder is gradually and continuously raised, and the material entering the inner cylinder is roasted at a certain temperature for a required time. And the material after being baked is cooled under the action of the cooling component of the cooling section and then is discharged from a feed opening of the furnace body, and then enters the next procedure.

The utility model has the advantages of reasonable structure, simple and convenient operation, and the components are mutually matched, so that the roasting material can be efficiently and uniformly roasted; the temperature rise speed of the rotary furnace is high, the thermal stability is good, the use power of the rotary furnace is low, the energy is saved, and the production cost is greatly reduced; the material roasting does not need a saggar for loading the material, and the inner cylinder adopts a graphite material as a lining, so that the risk of introducing magnetic foreign matters into the lithium iron phosphate material in the roasting process is avoided, and the product quality is improved.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a view from the direction a-a in fig. 1.

In the figure: 1. the device comprises a feeding bin, 2 parts of a spiral feeder, 3 parts of a burner, 4 parts of a regulating valve, 5 parts of a heating section, 6 parts of a heat preservation section, 7 parts of a cooling section, 8 parts of a cooling water inlet, 9 parts of a cooling water outlet, 10 parts of a smoke exhaust air pipe, 11 parts of a smoke exhaust fan, 12 parts of a gas pressure regulating valve bank, 13 parts of a gas pressure gauge, 14 parts of a gas pipeline, 15 parts of an air pipeline, 16 parts of a nitrogen pipeline, 17 parts of supporting legs, 18 parts of a rotating motor, 19 parts of an air inlet fan, 20 parts of a discharging port, 21 parts of a furnace body, 22 parts of a heat preservation layer, 23 parts of an inner cylinder, 24 parts of an inner liner, 25 parts of a lifting plate, 26 parts of a combustor.

Detailed Description

The present invention will be described more clearly with reference to the accompanying drawings, which are included to illustrate and not to limit the present invention. All other embodiments, which can be obtained by those skilled in the art without any inventive step based on the embodiments of the present invention, should be included in the scope of the present invention.

Examples

As shown in fig. 1-2, the utility model provides a rotary furnace for roasting lithium iron phosphate as a lithium ion battery anode material, which comprises a furnace body 21 and an inner cylinder 23, wherein the furnace body 21 is made of Q235 and other steel materials, the inner cylinder 23 is rotatably arranged in the furnace body 21, two ends of the inner cylinder 23 are rotatably connected with the furnace body 21 through bearings, the inner cylinder 23 is connected with a rotating motor 18, a heat-insulating layer 22 is arranged on the inner wall of the furnace body 21, the heat-insulating layer 22 is made of ceramic fiber cotton heat-insulating materials, the furnace body 21 is sequentially divided into a temperature-raising section 5, a heat-insulating section 6 and a temperature-reducing section 7 along the discharging direction, the temperature-raising section 5, the heat-insulating section 6 and the temperature-reducing section 7 are respectively provided with a temperature sensor, the temperature-raising section 5 and the heat-insulating section 6 are provided with heating components, the temperature-reducing section 7 is provided with a cooling component, the bottom of the furnace body 21 is connected with a telescopic supporting leg 17,

the feeding device is characterized in that a feeding bin 1 is connected to the feeding end of the furnace body 21, a spiral feeder 2 is arranged at the discharge port of the feeding bin 1, the discharge end of the spiral feeder 2 is communicated with the feeding port of an inner cylinder 23, the inner cylinder 23 is communicated with a nitrogen pipeline 16, the inner cylinder 23 is made of heat-resistant stainless steel 310S, a lining 24 is fixed on the inner wall of the inner cylinder 23, the lining 24 is made of high-purity graphite or silicon carbide materials, a plurality of lifting plates 25 are uniformly distributed on the lining 24 along the circumferential direction, and the lifting plates 25 are made of nonmetal such as high-purity graphite or silicon carbide.

Heating element includes gas pipeline 14, air conduit 15 and a plurality of combustor 26, be equipped with gas pressure regulating valves 12 and gas pressure gauge 13 on the gas pipeline 14, be equipped with air intake fan 19 on the air pipeline 15, a plurality of combustors 26 evenly distributed on rising temperature section 5 and heat preservation section 6, each combustor 26 and gas pipeline 14 and air conduit 15 intercommunication, gas pipeline 14 and air conduit 15 all are equipped with governing valve 4 with the intercommunication department of each combustor 26, burner 26's nozzle 3 runs through furnace body 21 and stretches into between inner tube 23 and the furnace body 21, the top of furnace body 21 is equipped with exhaust stack 10, be equipped with exhaust fan 11 on the exhaust stack 10.

The cooling component comprises a water cooling jacket which is fixed on the inner wall of the furnace body 21 between the furnace body 21 and the inner cylinder 23 of the cooling section 7, and the water cooling jacket is provided with a cooling water inlet 8 and a cooling water outlet 9.

The liner 24 is a graphite liner or a silicon carbide liner.

Landing leg 17 is rag bolt, adjusts its height through twisting rag bolt, realizes the adjustment to furnace body inclination, and this department is prior art, is the technical means who commonly uses, and here is no longer repeated.

The feed inlet of inner tube 23 stretches out outside furnace body 21, is located outer inner tube 23 of furnace body 21 and is connected with rotation motor 18, the feed inlet and the inner tube 23 coaxial line of inner tube 23, the feed inlet of inner tube 23 pass through the bearing and rotate the connection inlet pipe, the discharge end intercommunication of inlet pipe and screw feeder 2, nitrogen gas pipeline 16 and inlet pipe intercommunication, the discharge gate of inner tube 23 and the feed opening 20 of furnace body 21 correspond the cooperation each other.

When the furnace body roasting device works, the height of the support legs 17 is adjusted to enable the installation inclination angle of the furnace body 21 to be 0-5 degrees, powder in the previous process enters the feeding bin 1, the powder uniformly enters the inner barrel 23 through the spiral feeder 2 to be roasted, high-purity nitrogen is introduced into the inner barrel 23 when the material is roasted in the inner barrel 23 in a rotating and moving mode, gas is continuously combusted under the action of the burner 26 and the burner 3, the temperature of the temperature rising section 5 and the temperature preservation section 6 is continuously raised, the temperature in the inner barrel 23 is gradually and continuously raised, and the material entering the inner barrel 23 is roasted at a certain temperature and in a required time (the temperature of the temperature preservation section of the furnace body hearth is less than or equal to 850 ℃, temperature control is realized through the cooperation of a temperature sensor, a control adjusting valve, a gas valve bank, an air inlet fan and the like and the control is a common technical means in the field and is not described herein again. The material after baking and sintering is cooled under the action of the cooling component of the cooling section 7 and then is discharged from the feed opening 20 of the furnace body 21 to enter the next procedure.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a lithium ion battery cathode material lithium iron phosphate rotary furnace for calcination, includes furnace body and inner tube, the inner tube rotates and sets up in the furnace body, and the inner tube is connected with rotation motor, its characterized in that: the inner wall of the furnace body is provided with a heat preservation layer, the furnace body is sequentially divided into a temperature rising section, a heat preservation section and a temperature reduction section along the discharging direction, the temperature rising section and the heat preservation section are provided with heating components, the temperature reduction section is provided with a cooling component, the bottom of the furnace body is connected with a telescopic supporting leg,

2. The rotary furnace for roasting lithium iron phosphate as the positive electrode material of the lithium ion battery according to claim 1, characterized in that: the heating element includes gas pipeline, air conduit and a plurality of combustor, be equipped with gas pressure regulating valves and gas pressure gauge on the gas pipeline, be equipped with air inlet fan on the air conduit, a plurality of combustors evenly distributed on section and the heat preservation section of heating, each combustor and gas pipeline and air conduit intercommunication, gas pipeline and air conduit all are equipped with the governing valve with the intercommunication department of each combustor, the nozzle of combustor runs through the furnace body and stretches into between inner tube and the furnace body, the top of furnace body is equipped with the tuber pipe of discharging fume, be equipped with smoke exhaust fan on the tuber pipe of discharging fume.

3. The rotary furnace for roasting lithium iron phosphate as the positive electrode material of the lithium ion battery according to claim 1, characterized in that: the cooling assembly comprises a water-cooling jacket, the water-cooling jacket is fixed on the inner wall of the furnace body between the furnace body and the inner cylinder of the cooling section, and a cooling water inlet and a cooling water outlet are formed in the water-cooling jacket.

4. The rotary furnace for roasting lithium iron phosphate as the positive electrode material of the lithium ion battery according to claim 1, characterized in that: the lining is a graphite lining or a silicon carbide lining.

5. The rotary furnace for roasting lithium iron phosphate as the positive electrode material of the lithium ion battery according to claim 1, characterized in that: the landing leg is rag bolt or electric putter or cylinder.

6. The rotary furnace for roasting lithium iron phosphate as the positive electrode material of the lithium ion battery according to claim 1, characterized in that: the feed inlet of inner tube stretches out outside the furnace body, is located the outer inner tube of furnace body and is connected with the rotation motor, the feed inlet and the inner tube coaxial line of inner tube, the feed inlet of inner tube pass through the bearing and rotate and connect the inlet pipe, the inlet pipe communicates with the discharge end of screw feeder, nitrogen gas pipeline and inlet pipe intercommunication.