CN218627710U

CN218627710U - Sintering roller kiln

Info

Publication number: CN218627710U
Application number: CN202223060497.5U
Authority: CN
Inventors: 刘松; 许晟; 陈宏伟; 茅陆荣; 康治政; 严进
Original assignee: Morimatsu Jiangsu Heavy Industry Co Ltd
Current assignee: Morimatsu Jiangsu Heavy Industry Co Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-03-14
Anticipated expiration: 2032-11-18

Abstract

The utility model discloses a sintering roller kiln, which comprises a heat preservation layer arranged around the inner side of a roller kiln shell, an air inlet pipeline arranged on one side of the heat preservation layer in the kiln and used for inputting air or oxygen into the kiln, and an exhaust pipeline used for exhausting tail gas in the kiln out of the kiln, wherein the air inlet pipeline comprises a closed-loop air inlet inner pipe, an air inlet header pipe communicated with the air inlet inner pipe, and one or more air outlets in the kiln communicated with the air inlet inner pipe; the exhaust pipeline comprises an outer exhaust pipe in a closed ring shape, an exhaust main pipe communicated with the outer exhaust pipe and one or more in-kiln air inlets communicated with the outer exhaust pipe; either one of the exhaust outer pipe and the intake inner pipe is sleeved outside the other. Adopt the utility model discloses a sintering roller kilns can reduce the operation energy consumption of roller kilns to reduce the manufacturing cost who adopts such roller kilns to come the anodal material of sintering.

Description

Sintering roller kiln

Technical Field

The utility model relates to a sintering roller kiln, specifically speaking relates to an air intake and exhaust system of sintering roller kiln.

Background

Lithium batteries are used in the fields of energy storage, power, electronic consumer products and the like, and are becoming an important foundation stone of the national energy safety strategy. The anode material is the most critical raw material of the lithium battery, plays a leading role in the energy density and the safety performance of the battery and accounts for about 40 percent of the cost of the battery. As the high-temperature calcination equipment for the anode material, a roller kiln is usually adopted for carrying out high-temperature calcination on the anode material, and when the anode material is subjected to high-temperature calcination in the roller kiln, the anode material is driven by continuously arranged rollers in the roller kiln, and the continuously arranged rollers are driven to continuously transmit the anode material precursor. In addition, the calcining temperature in the roller kiln is controlled, so that the temperature in the kiln is uniform, the upper side, the lower side and the side of the roller rod can be heated, and the quality and the capacity of the lithium battery cathode material are greatly improved by the development of the roller kiln technology until now. The precursor of the anode material in the roller kiln is heated to about 800 ℃ from normal temperature, and the whole process goes through a heating zone, a constant temperature zone and a cooling zone, and high-temperature solid-phase chemical reaction can occur in the process. In addition, the sintering reaction is carried out in air or pure oxygen atmosphere according to the nickel content in the ternary cathode material. The energy consumption in the roller kiln mainly comprises heating and decomposition heat absorption of a ternary anode material, heat absorption of introduced gas, heat absorption of a sagger, heat dissipation of a kiln body and the like.

However, the prior roller kiln technology mainly has the problem of high energy consumption, and has the following specific expression:

(1) The temperature of the gas entering the kiln is low, so that more heat is needed in the temperature rising process;

(2) Directly discharging high-temperature tail gas discharged from the kiln so as to waste heat;

(3) The heat-insulating layer of the kiln shell has a limited effect on weakening heat dissipation of the kiln shell, and the energy-saving effect is poor.

Due to the problems, the operation energy consumption of the conventional sintering roller kiln for high-temperature calcination of the cathode material is high, so that the production cost of the cathode material is high.

In the prior art, for example, in the utility model patents disclosed in CN210773384U and CN206572939U, the heat of the tail gas is recycled by using the tail gas treatment device or the heat exchanger, but corresponding equipment needs to be additionally arranged, so that the overall structure of the roller kiln is complex, and the heat exchange and recovery efficiency is not high.

Therefore, there is an urgent need in the art for a sintering roller kiln capable of reducing the operation energy consumption of the sintering roller kiln, thereby reducing the production cost of the cathode material.

SUMMERY OF THE UTILITY MODEL

The utility model provides a sintering roller kiln, which comprises a heat preservation layer arranged around the inner side of a roller kiln shell, an air inlet pipeline arranged on one side of the heat preservation layer in the kiln and used for inputting air or oxygen into the kiln, and an exhaust pipeline used for exhausting tail gas in the kiln out of the kiln, wherein the air inlet pipeline comprises a closed-loop air inlet inner pipe, an air inlet header pipe communicated with the air inlet inner pipe, and one or more air outlets in the kiln communicated with the air inlet inner pipe; the exhaust pipeline comprises an exhaust outer pipe in a closed ring shape, an exhaust main pipe communicated with the exhaust outer pipe and one or more in-kiln air inlets communicated with the exhaust outer pipe; either one of the exhaust outer tube and the intake inner tube is fitted to the outside of the other.

Preferably, when the air inlet inner pipe is arranged in a closed ring shape along the heat insulation layer, the air inlet main pipe and the kiln air outlet are respectively arranged on opposite sides; when the outer exhaust pipe is sleeved outside the inner air inlet pipe and arranged in a closed ring shape along the heat insulation layer, the exhaust main pipe and the air inlet in the kiln are respectively arranged on one opposite side.

Preferably, when the air inlet main pipe is arranged at the bottom of the furnace chamber or the top of the furnace chamber close to the insulating layer, the air outlet in the kiln is arranged at the top of the furnace chamber or the bottom of the furnace chamber of the insulating layer.

Further preferably, when the exhaust manifold is disposed at the bottom of the furnace chamber or the top of the furnace chamber near the insulating layer, the in-kiln air inlet is disposed at the top of the furnace chamber or the bottom of the furnace chamber near the insulating layer.

Further preferably, 1 or more exhaust pipes are arranged on the exhaust outer pipe, and the exhaust pipes are arranged on the exhaust outer pipe positioned on the furnace chamber bottom side of the heat insulation layer.

Adopt foretell the utility model discloses a sintering roller kilns can reduce the operation energy consumption of sintering roller kilns to reduce the manufacturing cost who adopts such sintering roller kilns to come the positive pole material of sintering.

Drawings

Fig. 1 is a schematic longitudinal sectional view showing the sintering roller kiln of the present invention.

Fig. 2 is a schematic view showing the air intake and exhaust system of the sintering roller kiln of the present invention.

In the figure: 10-roller kiln; 11-roller kiln shell; 12. 13-insulating layer; 14-space in the kiln; 20-an air inlet duct; 21-an exhaust duct; 21 d-a clean pipe.

Detailed Description

The technical solution and effects of the present invention will be described in detail below with reference to the embodiments. The following embodiments are merely illustrative of the present invention, and the present invention is not limited to the following embodiments or examples. Use the utility model discloses a think about right the utility model discloses the simple change that goes on is all in the utility model discloses the within range that claims.

The utility model discloses a roller kilns 10 as sintering roller kilns, as shown in fig. 1, including setting up at 11 inboard heat preservation 12 of roller kilns casing, 13, wherein heat preservation 12 is bearing the heat preservation 13 that the longitudinal section is the n font as the bottom of roller kilns 10, and the space that this heat preservation 12 and this heat preservation 13 enclose just forms roller kilns inner space 14 as the furnace chamber of roller kilns 10.

A roller rod 15 and a roller rod driving device 16 are arranged in the roller kiln 10, wherein two ends of the roller rod 15 penetrate through the roller kiln shell 11 and the heat insulation layer 13 and are supported by the roller kiln shell 11 and the heat insulation layer 13; in addition, in roller kiln 10, still be provided with both ends and run through roller kiln casing 11 with heat preservation 13 and by roller kiln casing 11 with heating rod 17 that heat preservation 13 supported, this heating rod 17 both ends are connected with heating rod power connection box 18. On the roll bar 15, a plurality of sagger 19 for supporting the positive electrode material is disposed. The specific arrangement and number of the roller rods 15, the roller rod driving device 16, the heating rods 17, the heating rod power supply and connection box 18, and the sagger 19 are the same as those of the roller kiln of the prior art, and detailed description thereof will be omitted.

Further, an intake duct 20 for introducing air or oxygen into the kiln and an exhaust duct 21 for exhausting kiln exhaust gas are provided on the kiln interior side along the

heat insulating layers

12 and 13 in the kiln interior space 14.

The air inlet duct 20 includes a closed-loop air inlet inner tube 20a, an air inlet manifold 20b communicated with the air inlet inner tube 20a, and a plurality of (6 in this embodiment) kiln air outlets 20c communicated with the air inlet inner tube 20 a.

The exhaust duct 21 includes an outer exhaust pipe 21a in a closed ring shape, an exhaust manifold 21b communicating with the outer exhaust pipe 21a, and a plurality of (6 in the present embodiment) in-kiln intake ports 21c communicating with the outer exhaust pipe 21 a.

The outer exhaust pipe 21a is fitted around the inner intake pipe 20a, that is, the inner intake pipe 20a and the outer exhaust pipe 21a are configured as a jacket pipe.

When the air inlet inner tube 20a is arranged in a closed ring shape in the kiln space 14, the air inlet main tube 20b and the kiln air outlet 20c are respectively arranged at opposite sides, as shown in fig. 1, in this embodiment, the air inlet main tube 20b is arranged at the lower side of the roller kiln 10 (i.e. the bottom of the furnace chamber) and penetrates through the heat insulating layer 12; and the in-kiln air outlet 20c is arranged at the upper side (i.e. the top of the furnace chamber) of the roller kiln 10.

In addition, when the exhaust outer pipe 21a is sleeved outside the intake inner pipe 20a and is disposed in a closed loop shape in the kiln interior space 14, the exhaust main pipe 21b and the kiln interior air inlet 21c are respectively disposed on opposite sides, as shown in fig. 1, in this embodiment, the exhaust main pipe 21b is disposed on the upper side (i.e., the top of the furnace chamber) of the roller kiln 10 and penetrates through the heat insulating layer 13; and the in-kiln air outlet 21b is arranged at the lower side (i.e. the bottom of the furnace chamber) of the roller kiln 10.

In addition, a plurality of (2 in this embodiment) exhaust cleaning pipes 21d are disposed on the exhaust outer pipe 21a, and the exhaust cleaning pipes 21d are disposed on the exhaust outer pipe 21a on the furnace chamber bottom side of the heat insulating layer 12. As shown in fig. 1, 2 exhaust pipes 21d are respectively disposed on the outer exhaust pipe 21a on the left and right sides. The drain pipe 21d is provided through the insulating layer 12.

The intake manifold 20b in the present embodiment is connected to a gas supply source (not shown) for supplying air or oxygen, and the exhaust manifold 21 is connected to an exhaust gas treatment device (not shown).

Fig. 2 is a schematic view showing the air intake and exhaust system of the sintering roller kiln of the present invention. Next, the air intake and exhaust of the sintering roller kiln according to the present invention will be described with reference to fig. 2. As shown in fig. 2, air or oxygen supplied from a gas source required in the firing process enters the air inlet inner tube 20a from the lower side of the roller kiln 10 through the air inlet manifold 20b, and then the air or oxygen is transported from both sides along the air inlet inner tube 20a in a closed ring shape to the kiln air outlets 20c located at the upper side of the roller kiln 10 and is discharged into the intra-kiln space 14 through the six kiln air outlets 20c.

On the other hand, the high-temperature exhaust gas burned in the intra-kiln space 14 enters the outer exhaust gas pipe 21a from the six intra-kiln gas inlets 21c located on the lower side of the roller kiln 10, and is then transported from both sides along the outer exhaust gas pipe 21a in a closed loop shape to the exhaust manifold 21b located on the upper side of the roller kiln 10, and is discharged to the exhaust gas processing device outside the roller kiln 10 through the exhaust manifold 21 b. In addition, the solid impurities in the tail gas are discharged through the exhaust pipe 21 d.

In this way, in the process that the low-temperature air or oxygen reaches the kiln air outlet 20c through the air inlet inner tube 20a, the low-temperature air or oxygen is heated by the high-temperature exhaust gas sucked into the exhaust outer tube 21a through the kiln air inlet 21c, and the heated air or oxygen is discharged into the kiln interior space 14 through the kiln air outlet 20c, so that the temperature in the kiln interior space 14 is not lowered by the intake of the air or oxygen. On the other hand, the temperature of the high-temperature exhaust gas entering the outer exhaust gas pipe 21a is lowered by heat exchange during the process of heating the air or oxygen in the inner intake gas pipe 20a, so that the temperature of the exhaust gas discharged out of the roller kiln 10 through the main exhaust gas pipe 21b is lowered.

The roller kiln 10 of the present invention has the following advantages.

(1) The air inlet inner pipe 20a and the air outlet outer pipe 21a are formed by jacketed pipes, so that the waste heat of high-temperature tail gas in the kiln is recovered, the gas entering the kiln is preheated, the temperature of air or oxygen entering the kiln can be increased, and the energy consumption is reduced.

(2) The air inlet main pipe 20b and the kiln air outlet 20c are respectively arranged on opposite sides; the exhaust manifold 21b and the in-kiln intake port 21c are provided on opposite sides, respectively. In this way, the air or oxygen can be sufficiently heat-exchanged with the high-temperature exhaust gas flowing through the exhaust outer pipe 21a while flowing through the intake inner pipe 20 a.

(3) The exhaust outer pipe 21a is provided with the exhaust cleaning pipe 21d, and the exhaust cleaning pipe 21d is arranged on the exhaust outer pipe 21a at one side of the bottom of the kiln chamber. In this way, the solid impurities in the exhaust gas can be sufficiently discharged through the exhaust pipe 21d to prevent the blockage in the exhaust duct 21.

(4) The jacketed pipes formed by the air inlet pipe 20 and the air outlet pipe 21 are distributed along the inner side of the heat-insulating layer, so that the arrangement can reduce the radiant heat loss of the casket-like bowl, the heating roller and the roller way in the kiln.

(5) Gas outlet 20c sets up the upside at the roller kilns in the kiln, and air inlet 21c sets up the downside at the roller kilns in the kiln, so, and is different with the roller kilns gas among the prior art down-in and go out the mode, the utility model discloses a gas forms the flow mode from top to bottom in the kiln of roller kilns, thereby makes the cross-section temperature distribution in the kiln even, simultaneously, has avoided the material overburning in the upper sagger that upper portion temperature among the roller kilns of prior art causes on the high side, and the problem of material interbedding takes place in the sagger of lower floor.

Therefore, adopt the utility model discloses a roller kilns can reduce the operation energy consumption of roller kilns to reduce the manufacturing cost who adopts such roller kilns to come the anodal material of sintering.

As a modification of the embodiment of the present invention, the following modifications can be made.

A pipe clamp structure in which the intake inner pipe 20a is fitted around the exhaust outer pipe 21a may be employed.

From the viewpoint of only allowing air or oxygen entering the kiln to exchange heat with the exhaust gas to be exhausted from the kiln, the air inlet main pipe 20b and the kiln air outlet 20c may be disposed on opposite sides, that is, the air inlet main pipe 20b may be disposed on the lower side, the left side, or the right side of the roller kiln 10, and the kiln air outlet 20c may be disposed on the upper side, the right side, or the left side of the roller kiln 10; on the other hand, the exhaust manifold 21b and the in-kiln gas inlet 21c may be disposed on opposite sides, that is, the exhaust manifold 21b may be disposed on the upper side, the left side, or the right side of the roller kiln 10, and the in-kiln gas inlet 21c may be disposed on the lower side, the right side, or the left side of the roller kiln 10.

The number of the kiln inlet ports 21c and the kiln outlet ports 20c may be more than 6, for example, 2 to 5 or 7 to 10. In addition, the number of the purge pipes 21d may be 3 to 6.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention.

Claims

1. A sintering roller kiln comprises a heat-insulating layer arranged on the periphery of the inner side of a roller kiln shell, an air inlet pipeline arranged on one side of the heat-insulating layer in the kiln and used for inputting air or oxygen into the kiln, and an exhaust pipeline used for exhausting tail gas in the kiln out of the kiln,

the air inlet pipeline comprises a closed annular air inlet inner pipe, an air inlet main pipe communicated with the air inlet inner pipe and one or more kiln air outlets communicated with the air inlet inner pipe;

the exhaust pipeline comprises an outer exhaust pipe in a closed ring shape, an exhaust main pipe communicated with the outer exhaust pipe and one or more in-kiln air inlets communicated with the outer exhaust pipe;

either one of the exhaust outer tube and the intake inner tube is fitted to the outside of the other.

2. The sintering roller kiln according to claim 1, wherein when the air inlet inner pipe is arranged in a closed ring shape along the heat insulation layer, the air inlet main pipe and the kiln air outlet are respectively arranged on opposite sides; when the outer exhaust pipe is sleeved outside the inner air inlet pipe and arranged in a closed ring shape along the heat insulation layer, the exhaust main pipe and the air inlet in the kiln are respectively arranged on one opposite side.

3. The roller kiln according to claim 2, wherein when the air inlet manifold is disposed at the bottom of the furnace chamber or the top of the furnace chamber adjacent to the insulating layer, the air outlet port is disposed at the top of the furnace chamber or the bottom of the furnace chamber adjacent to the insulating layer.

4. The sintering roller kiln according to claim 2 or 3, wherein when the exhaust manifold is disposed at the bottom or top of the furnace chamber adjacent to the insulating layer, the in-kiln gas inlet is disposed at the top or bottom of the furnace chamber adjacent to the insulating layer.

5. The sintering roller kiln according to any of the claims 1 to 3, characterized in that 1 or more purging tubes are provided on the outer exhaust tube, said purging tubes being provided on the outer exhaust tube on the furnace chamber bottom side of the insulation layer.

6. The sintering roller kiln according to claim 4, wherein 1 or more exhaust pipes are provided on the exhaust outer pipe, and the exhaust pipes are provided on the exhaust outer pipe on the furnace chamber bottom side of the insulating layer.