CN218673179U - Energy-saving sintering system - Google Patents

Abstract

The utility model discloses an energy-conserving sintering system, especially an energy-conserving sintering system of lithium cell cathode material. The system comprises a raw material unit, a sintering unit and a post-processing unit which are sequentially communicated through an opening and closing device, wherein the raw material unit is provided with a negative pressure device, the sintering unit is of a dynamic closed structure, and the post-processing unit is communicated with a circulating dust collecting device. The system has the advantages that the negative pressure device is arranged at the front section of the sintering unit, the circulating dust collecting device is arranged at the rear section of the sintering unit, the front section and the rear section are designed into a dynamically sealed whole, the energy-saving effect is achieved, and the system has a good application prospect for industrial production.

Description

Energy-saving sintering system

Technical Field

The utility model relates to an energy-conserving sintering system especially relates to an energy-conserving sintering system of lithium cell cathode material.

Background

Most of the traditional lithium cobaltate production is tunnel kilns mainly based on electric heating as sintering equipment, particularly push plate type tunnel kilns, the structure of which is shown in fig. 2, materials are loaded in a sagger 106, the sagger 106 is placed on a push plate 101, the push plate 101 is positioned between furnace beams 108 arranged above and below, and heating wires 107 are arranged in the furnace beams 108. The push plate 101 is pushed by the hydraulic oil cylinder to carry materials to move periodically from the furnace head to the furnace tail. Wherein an air inlet pipe 104 arranged in an insulating layer 102 below the kiln and an air outlet pipe 105 driven by an upper fan 103 control the sintering gas content of the materials, and influence the result of the chemical reaction.

The air flow system formed by the lower air inlet and the upper air exhaust plays a role in determining the flow speed of air from bottom to top, the air flow direction from the furnace head to the furnace tail or from the furnace tail to the furnace head has little or no air effect, and once the air flows in the production workshop environment, the air in the kiln can be driven to flow along the air flow direction in the workshop integrally.

For the overall temperature rise curve of the kiln, the kiln is divided into three sections, wherein the first section is as follows: a temperature rise section (temperature heating rise); and a second stage: a heat preservation section (temperature is kept constant); and a third cooling section (the temperature naturally drops). According to the heating power configured by the kiln, the power of the heating section is the largest, the heating power of each temperature zone is 6.4KW (based on the upper and lower controls), 4 temperature zones are provided, and the heating power of each temperature zone of the heat preservation section is 4.2KW.

In theory or in practical arrangement, the temperature raising section consumes a large amount of heat energy (electric energy), so if the heating temperature difference of the air is reduced, the electric energy consumption is necessarily reduced.

At present, in the production process of the lithium battery positive electrode material, a door to a mixing workshop is opened, and the mixing workshop is not provided with a dust collecting device. Therefore, the flow direction of the whole ambient air in the workshop flows from the furnace head to the furnace tail, and is not interfered by the outside.

In view of this, the present invention is especially provided.

SUMMERY OF THE UTILITY MODEL

For solving the technical problem, the utility model provides an energy-conserving sintering system, this energy-conserving sintering system have from the afterbody of sintering unit to the gaseous flow direction that the head flows, can flow to the head after the cold air of afterbody and the high temperature product heat exchange after the sintering and treat the sintering product and preheat to reduce the heating power of furnace end to a certain extent, play energy-conserving effect, make it have good application prospect.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides an energy-conserving sintering system, includes raw materials unit, sintering unit and the aftertreatment unit that communicates in proper order through switching device, the raw materials unit is equipped with negative pressure device, the sintering unit is dynamic airtight structure, aftertreatment unit intercommunication has the circulation dust arrester installation. The raw material unit is generally of a dynamic closed structure, that is, the raw material unit is in a sealed state when an external opening and closing device and an opening and closing device for the sintering unit are both in a closed state. The same applies to the sintering unit and the post-treatment unit.

Preferably, the negative pressure device comprises a dust collecting device, and an air outlet of an air exhaust pipeline of the dust collecting device is positioned outside the raw material unit, so that the raw material unit is in a negative pressure state relative to the sintering unit. The dust collecting device can play a negative pressure pumping effect and can remove and collect dust of the raw material unit as an optimal technical scheme.

Furthermore, the circulating dust collecting device comprises a dust collecting port, a filter, a dust collector and an air return pipeline which are connected in sequence, and outlets of the dust collecting port and the air return pipeline are arranged inside the post-processing unit, so that negative pressure relative to the sintering unit cannot be generated inside the whole post-processing unit.

Preferably, the raw material unit comprises a mixing room, the sintering unit comprises a sintering room, and the post-treatment unit comprises a crushing room; the negative pressure device is arranged between the mixing materials. Generally, a loading chamber is arranged between the mixing chamber and the sintering chamber, and the prepared materials are loaded in a sagger and then enter the sintering chamber.

Preferably, the opening and closing device is a door or a window.

Further, the sintering unit comprises a group or a plurality of groups of kilns arranged side by side, preferably a plurality of groups of kilns arranged side by side. The kiln is of a hollow structure and comprises a raw material conveying device, a heating device, a heat insulation layer and the like.

The raw material conveying device is located in the hollow part of the kiln, the heating device is located above and/or below the raw material conveying device, and the heat insulation layer is located on the peripheries of the raw material conveying device and the heating device. The inlet and the outlet of the raw material conveying device are open, and can be a push plate erected on a track brick, and a plurality of saggers for loading raw materials are arranged on the push plate.

Preferably, a normal-temperature air inlet is formed in the sintering unit and is positioned between the kiln tail and the post-processing unit; preferably, the normal temperature air inlet is communicated with the outside atmosphere. Generally, the normal temperature air inlet can be arranged at the top or the side of the sintering unit. When sintering is carried out, the dust collecting device is started, the opening and closing device which is communicated with the raw material unit and the sintering unit is kept normally open, and airflow in the direction from the furnace tail to the furnace head of the kiln is formed. The air flow is generally weak, normal-temperature air entering the furnace tail can be heated, and meanwhile, the air flow flows to the position of the furnace end, so that the material preheating effect is achieved.

Further preferably, the sintering unit is provided with an air exhaust device, and an air exhaust port of the air exhaust device is positioned outside the sintering unit. Generally, the air exhaust device can be arranged on the top or the side of the sintering unit between the furnace head and the furnace tail. The exhaust device comprises an exhaust fan, the exhaust volume of the exhaust fan is less than the intake volume of the normal-temperature air inlet, and not only can CO be discharged ₂ When the waste gas is used, the sintering unit can be kept in a micro-positive pressure state, the sintering unit can be kept in a good sintering atmosphere, the pressure is not too high, and meanwhile, the entering of external sundries and dust can be avoided.

Preferably, the kiln can also be provided with an air inlet pipe and an air exhaust pipe. The air inlet and the air outlet of the air inlet pipes and the air outlet pipes are circulated in the sintering unit and are vertical to the direction from the furnace head to the furnace tail or form a certain angle. The air inlet pipe penetrates through the heat insulation layer at the lower part of the kiln and is communicated with the hollow part, and the exhaust pipe penetrates through the heat insulation layer at the upper part of the kiln and is communicated with the hollow part.

Compared with the prior art, the utility model discloses a set up the negative pressure device of sintering unit anterior segment and the circulation dust arrester installation behind the sintering unit to design sintering unit and front and back end into a relatively closed whole, change the flow direction of ambient air into from the stove tail to the furnace end, when normal atmospheric temperature air gets into from the stove tail, when the material of cooling out of the stove, by the material heating, equal to the material has carried out once preheating to normal atmospheric temperature air, makes kiln heating system reduce the air heating energy consumption; when hot air flows out of the furnace end, the hot air flows from the high-temperature area to the low-temperature area, so that heat of the high-temperature area is brought to the low-temperature area, the heating area is assisted to heat materials entering the furnace, and the heating power of the heating area is reduced. Therefore, the energy consumption and the operation cost are obviously reduced, and the method has good application prospect for industrial production.

Drawings

In order to more clearly illustrate the technical solutions of the background and the embodiments of the present invention, the drawings needed to be used in the background and the embodiments will be briefly described below, it should be understood that the following drawings may only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained from these drawings without inventive efforts.

FIG. 1 is a schematic view of a system configuration of embodiment 1;

fig. 2 is a schematic structural diagram of a kiln in the prior art.

Description of reference numerals:

1-a kiln; 101-a push plate; 102-an insulating layer; 103-a fan; 104-an air inlet pipe; 105-an exhaust duct; 106-sagger; 107-heating wires; 108-furnace beam; 2-mixing the materials; 3, a first door; 4-loading in a bowl; 5-a dust collecting device; 6-normal temperature air inlet; 7-a crushing chamber; 8-sintering chamber; 9-dust collection port I; 10-dust collecting port II; 11-a filter; 12-a dust collector; 13-return air duct; 14-door two.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it should be understood that the terms "front section", "rear section", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "provided", "connected", "communicating", and the like are to be construed broadly, e.g., as fixed connections, detachable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The term "closed" means that the structure is relatively closed except for accessible pipes, which cannot be understood as closed in any case. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Example 1

An energy-saving sintering system is shown in figure 1 and comprises a raw material unit, a sintering unit and a post-treatment unit which are communicated in sequence, wherein the raw material unit and the sintering unit are communicated through a first door 3, and the sintering unit and the post-treatment unit are communicated through a second door 14. The raw materials unit is including 2 and dress alms bowl within a definite time between the continuous compounding 2, 2 are equipped with dust arrester installation 5 between the compounding, dust arrester installation 5's dust collection mouth 9 is located 2 between the compounding, the air outlet of dust arrester installation 5's exhaust duct is located outside the raw materials unit, door 3 has a plurality ofly, each door 3 all opens on the wall of 2 between the compounding just to the sintering unit head, dress alms bowl within a definite time 4 is for 2 intercommunications between the compounding but airtight for the sintering unit, in other embodiments, dress alms bowl within a definite time 4 also can be through seting up door and sintering unit intercommunication, be convenient for carry the saggar to the sintering unit. The sintering unit is a sintering chamber 8 with a dynamic closed structure. The post-treatment unit comprises a crushing room 7, and the crushing room 7 is communicated with a circulating dust collecting device. The circulating dust collecting device comprises a second dust collecting port 10, a filter 11, a dust collector 12 and an air return pipeline 13 which are sequentially connected, and outlets of the second dust collecting port 10 and the air return pipeline 13 are arranged in the crushing room 7, so that negative pressure relative to the sintering room 8 cannot be generated in the whole crushing room 7.

In order to adjust the atmosphere of the sintering chamber 8 to achieve the purpose of saving energy, the door I3 is kept in a normally open state when sintering is carried out.

In this embodiment, the sintering chamber 8 includes four sets of kilns 1 arranged side by side, and the kilns 1 are hollow as shown in fig. 2, and include a raw material conveying device, a heating device, an insulating layer and the like inside.

The raw material conveying device is positioned in the hollow part of the kiln 1, and the inlet and the outlet of the raw material conveying device are open. The raw material conveying device comprises a push plate 101 erected on a track brick and a plurality of saggars 106 for loading raw materials, and the saggars 106 are arranged on the push plate 101. The heating device is composed of an upper row of heating wires 107 and a lower row of heating wires 107 which are respectively positioned above and below the raw material conveying device, and the heat insulation layer 102 is positioned on the peripheries of the raw material conveying device and the heating device.

The top of the sintering chamber 8 is provided with a normal temperature air inlet 6 communicated with the outside atmosphere and positioned between the furnace tail of the kiln 1 and the crushing chamber 7. When sintering is carried out, the dust collecting device 5 is started, and the door I3 which is communicated with the mixing room 2 and the sintering room 8 is kept normally open, so that weak airflow in the direction from the furnace tail to the furnace head of the kiln 1 is formed.

In another embodiment, the sintering chamber 8 may not be provided with the normal temperature air inlet, and only by keeping the door 14 between the sintering chamber 8 and the crushing chamber 7 normally open, a weak air flow in the direction from the furnace tail to the furnace head of the kiln 1 may be formed to some extent.

In other embodiments, an air exhaust device may be disposed on the top of the sintering chamber 8 between the furnace head and the furnace tail, and the air exhaust device is connected to an air exhaust fan, and the air exhaust amount is set to be smaller than the air intake amount of the normal temperature air inlet 6, so that the sintering chamber 8 maintains a slight positive pressure to prevent the entry of foreign dust.

In other embodiments, the kiln 1 is further provided with an air inlet pipe and an air outlet pipe, and air inlet and air outlet of the air inlet pipe and the air outlet pipe are both circulated inside the sintering chamber 8 and are perpendicular to or at a certain angle with respect to the direction from the furnace end to the furnace end, which has little influence on the air flow direction from the furnace end to the furnace end in this embodiment. The air inlet pipe penetrates through the heat-insulating layer at the lower part of the kiln 1 and is communicated with the hollow part, and the exhaust pipe penetrates through the heat-insulating layer at the upper part of the kiln 1 and is communicated with the hollow part.

In the operation process of the system in the embodiment, the raw materials enter the kiln 1 of the sintering chamber 8 after the materials are mixed and loaded, the heating wires 107 are started for heating, the saggars 106 are transported to the tail of the kiln from the furnace head under the pushing of the hydraulic oil cylinder, at the moment, the door I3 between the mixing chamber 2 and the sintering chamber 8 is kept in a normally open state, the air in the sintering chamber 8 is continuously pumped out by utilizing the dust collecting device 5 and the pipeline thereof, negative pressure is generated, and the flowing strength (including air volume and air speed) of the whole ambient air flow to the tail of the kiln in the workshop is weakened.

Meanwhile, normal temperature air is introduced into the direction of the furnace tail from the normal temperature air inlet 6, and is heated by the material while the material is cooled and discharged, which is equivalent to that the material preheats cold air once, so that the heating device of the kiln 1 reduces the energy consumption for heating the air. When hot air flows out of the furnace end, the hot air flows from the high-temperature area to the low-temperature area, so that heat of the high-temperature area is brought to the low-temperature area, the heating of furnace materials in the heating area is assisted, and the heating power of the heating area is reduced.

Compared with the upper and lower temperature control of the existing sintering kiln workshop, the upper and lower temperature control in the embodiment has smaller reduction range compared with the existing process, but almost all the temperature control is reduced, and the overall energy consumption is reduced.

TABLE 1 comparison of the Up-and-Down temperature control of the Current Process and the present example

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "preferred embodiments," "specific examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (11)

1. The utility model provides an energy-conserving sintering system, includes raw materials unit, sintering unit and the aftertreatment unit that communicates in proper order through switching device, its characterized in that, the raw materials unit is equipped with negative pressure device, the sintering unit is dynamic airtight structure, aftertreatment unit intercommunication has circulation dust arrester installation.

2. The energy-saving sintering system according to claim 1, wherein the negative pressure device comprises a dust collecting device, and an air outlet of an air exhaust pipeline of the dust collecting device is positioned outside the raw material unit.

3. The energy efficient sintering system of claim 1, wherein the raw material unit comprises a compound room, the sintering unit comprises a sintering room, and the post-processing unit comprises a crushing room; the negative pressure device is arranged between the mixing materials.

4. The energy efficient sintering system of claim 3, wherein the opening and closing device is a door or window.

5. The energy-saving sintering system according to any one of claims 1 to 4, wherein the sintering unit comprises one or several groups of kilns arranged side by side.

6. The energy-saving sintering system of claim 5, wherein a normal temperature air inlet is formed in the sintering unit and is located between the kiln tail and the post-treatment unit.

7. The energy-saving sintering system of claim 6, wherein the normal temperature air inlet is communicated with the outside atmosphere.

8. The energy-saving sintering system according to claim 1, wherein the circulating dust collecting device comprises a dust collecting port, a filter, a dust collector and a return air pipeline which are connected in sequence, and outlets of the dust collecting port and the return air pipeline are arranged in the post-processing unit.

9. The energy saving sintering system of claim 1, wherein the opening and closing device communicating the raw material unit and sintering unit is kept normally open during sintering.

10. The energy-saving sintering system according to claim 6, wherein the sintering unit is provided with an air exhaust device, and an air outlet of the air exhaust device is positioned outside the sintering unit.

11. The energy-saving sintering system of claim 10, wherein the exhaust device comprises an exhaust fan, and the exhaust volume of the exhaust fan is smaller than the intake volume of the normal temperature air inlet.

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