CN216592724U - Lithium cell cathode material carbonization production roller kilns - Google Patents
Lithium cell cathode material carbonization production roller kilns Download PDFInfo
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- CN216592724U CN216592724U CN202122776231.XU CN202122776231U CN216592724U CN 216592724 U CN216592724 U CN 216592724U CN 202122776231 U CN202122776231 U CN 202122776231U CN 216592724 U CN216592724 U CN 216592724U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a roller kiln for carbonization production of a lithium battery cathode material, which comprises a conveying roller way, and an inlet section, a temperature rising section, a constant temperature section, a temperature reduction section and an outlet section which are sequentially penetrated by the conveying roller way, wherein a waste gas treatment section is also arranged above the temperature rising section and is communicated with the temperature rising section, the inlet section is provided with an inlet replacement chamber, a saggar enters from the inlet replacement chamber, the temperature reduction section is provided with a heat dissipation chamber, a cooling water pipe and a cooling air pipe, the waste gas treatment section is communicated with the temperature rising section through a flue gas pipeline, and flue gas generated by the temperature rising section can enter the waste gas treatment section through the flue gas pipeline. By adopting the utility model, the raw material can be uniformly and quickly heated, so that the production efficiency and the product quality are improved, and meanwhile, the waste gas can be effectively treated, thereby meeting the requirement of environmental protection.
Description
Technical Field
The utility model relates to the technical field of lithium battery production, in particular to a roller kiln for producing a lithium battery cathode material through carbonization.
Background
With the rapid development of the new energy automobile industry in China, the power lithium battery industry for new energy automobiles is also briskly developed. Graphite is often used as a main material for lithium battery cathodes in the industry at present, graphite raw materials are required to be loaded into a sagger during production, then the graphite raw materials in the sagger are required to undergo the processes of high-temperature sintering, constant-temperature reaction and cooling, the problems of uneven heating, slower cooling and the like of the graphite raw materials are easily caused by the conventional roller kiln, and the production efficiency and the product quality are greatly influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing a roller kiln for carbonizing a lithium battery negative electrode material, which can uniformly and quickly heat and cool raw materials, thereby improving the production efficiency and the product quality, effectively treating waste gas and meeting the requirement of environmental protection.
In order to solve the technical problem, the utility model provides a roller kiln for producing a lithium battery cathode material through carbonization, which is used for processing raw materials placed in a sagger and comprises a conveying roller way, and an inlet section, a heating section, a constant temperature section, a cooling section and an outlet section which are sequentially penetrated through by the conveying roller way, wherein a waste gas processing section is also arranged above the heating section and is communicated with the heating section.
The sagger is arranged in the heating section, the heating section comprises an atmosphere chamber, a conveying pipe and a heating mechanism, the conveying pipe is communicated with an external nitrogen source and used for conveying nitrogen into the atmosphere chamber, and the heating mechanism is fixed on the side wall of the atmosphere chamber and used for heating raw materials in the sagger; heating mechanism includes first heating member and second heating member, first heating member is located the top of rollgang, the second heating member is located the below of rollgang.
The cooling section is provided with a heat dissipation chamber, a cooling water pipe and a cooling air pipe, cooling water is introduced into the cooling water pipe, the cooling air pipe is arranged at the top of the heat dissipation chamber, and the cooling water pipe and the cooling air pipe are both used for cooling the raw materials in the sagger; and a thermostatic chamber is arranged in the thermostatic section, and two ends of the thermostatic chamber are respectively communicated with the atmosphere chamber and the heat dissipation chamber.
The waste gas treatment section is communicated with the temperature rise section through a flue gas pipeline, flue gas generated by the temperature rise section can enter the waste gas treatment section through the flue gas pipeline, the waste gas treatment section is provided with a treatment furnace, a combustion tube assembly and a cooling tube assembly, the combustion tube assembly is inserted into the treatment furnace and used for enabling waste gas in the treatment furnace to be combusted, and the cooling tube assembly is communicated with an external normal-temperature air source or a low-temperature air source and is connected into the treatment furnace.
The outlet section is provided with an outlet replacement chamber from which the saggars are transported.
As an improvement of the above, the sagger enters from an inlet side of the inlet replacement chamber and enters the atmosphere chamber from an outlet side of the inlet replacement chamber, the inlet replacement chamber including a first inlet seal gate located near the inlet side of the inlet replacement chamber and a second inlet seal gate located near the outlet side of the inlet replacement chamber.
As a modification of the above aspect, the first heating member and the second heating member each span two side walls of the atmosphere chamber which are disposed opposite to each other, and a middle portion of the first heating member and a middle portion of the second heating member can heat the middle portion of the atmosphere chamber.
As an improvement of the scheme, the combustion tube assembly comprises a natural gas pipeline, a combustion air pipeline and a combustion nozzle, the natural gas pipeline is communicated with the combustion air pipeline, natural gas in the natural gas pipeline and combustion air in the combustion air pipeline are mixed in the combustion nozzle and are sprayed into the treatment furnace through the combustion nozzle.
As an improvement of the scheme, the cooling pipe assembly comprises a cooling nozzle, the cooling nozzle is communicated with an external normal-temperature air source or a low-temperature air source, and the cooling nozzle is respectively arranged on the front side wall and the middle side wall of the treatment furnace.
As an improvement of the scheme, the waste gas treatment section further comprises a heat insulation layer, and the heat insulation layer covers the inner wall of the treatment furnace.
As an improvement of the scheme, the cooling water pipe comprises a first water pipe and a second water pipe, the first water pipe is coiled above the conveying roller way, and the second water pipe is coiled below the conveying roller way.
As an improvement of the scheme, the cooling section further comprises a cooling fan, the cooling fan is communicated with the cooling air pipe, the cooling fan is used for extracting heat in the heat dissipation chamber, and a ventilation hole is formed below the heat dissipation chamber.
As an improvement of the above, the sagger enters from an inlet side of the outlet replacement chamber and is transported out from an outlet side of the inlet replacement chamber, the outlet replacement chamber includes a first outlet sealing gate and a second outlet sealing gate, the first outlet sealing gate is located near the inlet side of the outlet replacement chamber, and the second outlet sealing gate is located near the outlet side of the outlet replacement chamber.
As a modification of the above scheme, the number of the atmosphere chambers is 6, the number of the thermostatic chambers is 7, and the number of the heat dissipation chambers is 4.
The implementation of the utility model has the following beneficial effects:
the roller kiln for producing the lithium battery cathode material by carbonization is provided with a temperature rising section, a constant temperature section, a temperature reduction section and a waste gas treatment section, and can be used for respectively carrying out high-temperature sintering, constant-temperature reaction, temperature reduction cooling and waste gas treatment on raw materials in a sagger. In the section of heating, heating mechanism includes first heating member and second heating member, first heating member with the second heating member is located respectively the top and the below of rollgang to guarantee the even heating, moreover first heating member with the second heating member all span in two relative lateral walls that set up of atmosphere room, promptly to there is the heating also in the middle part of the atmosphere room, consequently can further improve the heating homogeneity of atmosphere room. In addition, the cooling section is equipped with condenser tube and cooling air pipe, and can be right through water-cooling and forced air cooling's mode the sagger cools off, can improve cooling efficiency, shortens the cooling time, improves production efficiency. Therefore, the roller kiln for producing the lithium battery cathode material by carbonizing can uniformly and quickly heat and cool the raw materials, thereby improving the production efficiency and the product quality.
In addition, the waste gas treatment section is internally provided with a combustion tube assembly and a cooling assembly, so that waste gas generated by the temperature rising section can be fully combusted, the temperature in the treatment furnace can be controlled through the cooling assembly, the exhaust temperature is reduced, the treatment efficiency is high, and the requirement of environmental protection is met.
Drawings
FIG. 1 is a schematic structural diagram of a roller kiln for producing a lithium battery cathode material by carbonizing;
FIG. 2 is a schematic view of the inlet section of the present invention;
FIG. 3 is a schematic structural diagram of the temperature rising section of the present invention
FIG. 4 is a schematic structural view of the cooling section of the present invention;
FIG. 5 is a schematic structural view of the outlet block of the present invention;
FIG. 6 is a schematic view of the structure of the exhaust gas treatment section of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the utility model is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the utility model.
Referring to fig. 1, the embodiment of the utility model discloses a roller kiln for carbonization production of a lithium battery anode material, which is used for processing raw materials placed in a sagger 8, the roller kiln for carbonization production of a lithium battery anode material comprises a roller conveyor 7, and an inlet section 1, a heating section 2, a constant temperature section 3, a cooling section 4 and an outlet section 5 which are sequentially penetrated by the roller conveyor 7, the sagger 8 is placed on the roller kiln and sequentially passes through the inlet section 1, the heating section 2, the constant temperature section 3, the cooling section 4 and the outlet section 5, the heating section 2, the constant temperature section 3 and the cooling section 4 are respectively used for performing high-temperature sintering, constant-temperature reaction and cooling on the raw materials in the sagger 8, wherein in the high-temperature sintering and constant-temperature reaction, the raw materials in the sagger 8 are all reacted, a waste gas processing section 6 is further arranged above the heating section 2, the waste gas treatment section 6 is communicated with the temperature rising section 2, waste gas generated by high-temperature sintering in the temperature rising section 2 can be introduced into the waste gas treatment section 6, and the waste gas treatment section 6 is used for treating the waste gas.
Referring to fig. 2, the inlet section 1 is provided with an inlet replacement chamber 11, under the driving of the conveying roller 7, the sagger 8 enters the lithium battery negative electrode material carbonization production roller kiln from the inlet replacement chamber 11, air is extracted and nitrogen is gradually released in the replacement chamber, then the sagger 8 enters the temperature raising section 2, the temperature raising section 2 comprises an atmosphere chamber 21, a conveying pipe 22 and a heating mechanism 23, the conveying pipe 22 is communicated with an external nitrogen source and used for conveying nitrogen into the atmosphere chamber 21, the heating mechanism 23 is fixed on the side wall of the atmosphere chamber 21 and used for heating raw materials in the sagger 8, and the raw materials in the sagger 8 are carbonized and sintered in an environment with high-temperature heating and nitrogen isolation.
Referring to fig. 3, the heating mechanism 23 includes a first heating member 231 and a second heating member 232, the first heating member 231 is located above the roller conveyor 7, and the second heating member 232 is located below the roller conveyor 7, so that the raw material in the sagger 8 can be heated from above and below the sagger 8, and the heating uniformity is improved. After the heating, sagger 8 can get into constant temperature section 3 continues to carry out the carbonization, follows constant temperature section 3 comes out the back sagger 8 can get into cooling section 4 cools down raw and other materials, cooling section 4 is equipped with cooling chamber 41, condenser tube 42 and cooling air pipe 43, it has the cooling water to lead to in the condenser tube 42, cooling air pipe 43 locates cooling chamber 41's top, condenser tube 42 with cooling air pipe 43 all is used for right raw and other materials in the sagger 8 cools off, carries out the mode that combines through water-cooling and air-cooling, can improve cooling efficiency greatly to shorten the operation cycle, improve production efficiency. A thermostatic chamber 31 is arranged in the thermostatic section 3, and two ends of the thermostatic chamber 31 are respectively communicated with the atmosphere chamber 21 and the heat dissipation chamber 41.
Exhaust-gas treatment section 6 through flue gas pipeline 61 with 2 intercommunications of section of raising the temperature, the flue gas that 2 production of section of raising the temperature can pass through flue gas pipeline 61 gets into exhaust-gas treatment section 6, in order to handle the flue gas, exhaust-gas treatment section 6 is equipped with treatment furnace 62, burner tube subassembly 63 and cooling tube subassembly 64, burner tube subassembly 63 can insert in the treatment furnace 62, be used for making waste gas in the treatment furnace 62 burns, through the burning back, because the combustion products is higher like temperature such as carbon dioxide, unsatisfied emission requirement, gives simultaneously for the cooling of combustion products the cooling of treatment furnace 62, cooling tube subassembly 64 communicates with outside normal atmospheric temperature air source or low temperature air source and inserts in the treatment furnace 62 for the cooling. The outlet section 5 is provided with an outlet replacement chamber 51, from which outlet replacement chamber 51 the sagger 8 is transported out.
The embodiment of the utility model has the following beneficial effects:
the roller kiln for producing the lithium battery cathode material by carbonization is provided with the temperature rising section 2, the constant temperature section 3, the temperature reduction section 4 and the waste gas treatment section 6, and can be used for respectively carrying out high-temperature sintering, constant-temperature reaction, temperature reduction cooling and waste gas treatment on raw materials in the sagger 8. In the temperature rising section 2, the heating mechanism 23 includes a first heating member 231 and a second heating member 232, and the first heating member 231 and the second heating member 232 are respectively located above and below the roller conveyor 7 to ensure uniform heating. In addition, cooling section 4 is equipped with condenser tube 42 and cooling air pipe 43, and can be right through water-cooling and forced air cooling's mode sagger 8 cools off, can improve cooling efficiency, shortens the cooling time, improves production efficiency. Therefore, the roller kiln for producing the lithium battery cathode material by carbonizing can uniformly and quickly heat and cool the raw materials, thereby improving the production efficiency and the product quality.
The sagger 8 enters from the inlet side of the inlet replacement chamber 11 and enters the atmosphere chamber 21 from the outlet side of the inlet replacement chamber 11, the inlet replacement chamber 11 includes a first inlet sealing door 12 and a second inlet sealing door 13, the first inlet sealing door 12 is located near the inlet side of the inlet replacement chamber 11, and the second inlet sealing door 13 is located near the outlet side of the inlet replacement chamber 11. When the sagger 8 enters the inlet replacement chamber 11, the second inlet sealing door 13 is closed, the first inlet sealing door 12 is opened, the sagger 8 enters the middle part of the inlet replacement chamber 11, the first inlet sealing door 12 is closed at the moment, the inlet replacement chamber 11 is vacuumized in the sealing space of the first inlet sealing door 12 and the second inlet sealing door 13 to exhaust air entering along with the sagger 8, then nitrogen is charged, the nitrogen concentration in the sagger 8 is enabled to be solved by the nitrogen concentration in the atmosphere chamber 21, and then the second inlet sealing door 13 is opened, so that the space around the sagger 8 is communicated with the atmosphere chamber 21.
In order to further improve the heating uniformity, the first heating member 231 and the second heating member 232 both span across two opposite side walls of the atmosphere chamber 21, so that the heating range of the first heating member 231 and the second heating member 232 can cover the position of the sagger 8 in the atmosphere chamber 21, and the middle part of the first heating member 231 and the middle part of the second heating member 232 can heat the middle part of the atmosphere chamber 21, so that the upper part, the lower part, the side part and the middle part of the sagger 8 can be heated, and thus the heating uniformity can be improved.
Referring to fig. 5, in the exhaust gas treatment section 6, the burner tube assembly 63 includes a natural gas pipe 631, a combustion air pipe 632 and a combustion nozzle 633, the natural gas pipe 631 is communicated with the combustion air pipe 632, the natural gas pipe 631 is used for filling natural gas, and the combustion air pipe 632 is used for filling combustion air to provide combustion supporter since flue gas contains a large amount of nitrogen and is not beneficial to combustion. The natural gas in the natural gas pipeline 631 and the combustion air in the combustion air pipeline 632 are mixed in the combustion nozzle 633 and are sprayed into the treatment furnace 62 through the combustion nozzle 633, and then the combustion nozzle 633 ignites to burn the natural gas and the combustion air, so that the tar which is not fully reacted is treated in the burning process.
The combustion temperature in the reaction furnace is above 800 ℃, and the temperature of the flue gas after combustion can reach 1000 ℃, so in order to discharge the flue gas smoothly and prolong the service life of ventilation equipment, the flue gas needs to be cooled and then discharged. The cooling pipe assembly 64 includes a cooling nozzle 641, the cooling nozzle 641 is communicated with an external normal temperature air source or a low temperature air source, and the cooling nozzle 641 is respectively disposed on the front and middle side walls of the processing furnace 62. After the flue gas is combusted, the cooling nozzles 641 can respectively spray normal temperature air or low temperature air from the front and middle parts of the treating furnace 62 to cool the flue gas, and then start an external exhaust system to exhaust the flue gas. In order to improve the cooling efficiency, the cooling nozzles 641 are disposed only at the front and middle portions of the treating furnace 62 to lower the temperature of the initial combustion section as quickly as possible.
In order to make the heat in the treatment furnace 62 not easy to lose, make the inside of the treatment furnace 62 can carry out efficient combustion reaction, and in order to protect the treatment furnace 62, the exhaust gas treatment section 6 further comprises a heat preservation and insulation layer 65, and the heat preservation and insulation layer 65 covers the inner wall of the treatment furnace 62, so that the heat efficiency of the treatment furnace 62 is improved.
Referring to fig. 6, after exiting the temperature reduction section 4, the sagger 8 enters the outlet section 5 from the inlet side of the outlet replacement chamber 51 and is transported out from the outlet side of the inlet replacement chamber 11, the outlet replacement chamber 51 includes a first outlet sealing door 52 and a second outlet sealing door 53, when the sagger 8 enters the outlet replacement chamber 51, the first outlet sealing door 52 is in an open state, the second outlet sealing door 53 is in a closed state, then the first outlet sealing door 52 is closed to isolate the temperature reduction section 4 from the external space, then the second outlet sealing door 53 is opened, and the sagger 8 exits from the second outlet sealing door 53. The first outlet sealing gate 52 is located near the inlet side of the outlet replacement chamber 51 and the second outlet sealing gate 53 is located near the outlet side of the outlet replacement chamber 51. Preferably, the number of the atmosphere chambers 21 is 6, the number of the thermostatic chambers 31 is 7, and the number of the heat radiating chambers 41 is 4, so that the atmosphere chambers 21 and the thermostatic chambers 31 can ensure a long reaction time, and the number of the heat radiating chambers 41 can be reduced to shorten the operation time due to the improvement of the cooling efficiency.
The foregoing is a preferred embodiment of the present invention, and it should be noted that it would be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the utility model, and such modifications and enhancements are also considered to be within the scope of the utility model.
Claims (10)
1. A roller kiln for carbonization production of lithium battery cathode materials is used for processing raw materials placed in a sagger and is characterized by comprising a conveying roller way, and an inlet section, a temperature rising section, a constant temperature section, a temperature lowering section and an outlet section which are sequentially penetrated by the conveying roller way, wherein a waste gas processing section is also arranged above the temperature rising section and is communicated with the temperature rising section;
the sagger is arranged in the heating section, the heating section comprises an atmosphere chamber, a conveying pipe and a heating mechanism, the conveying pipe is communicated with an external nitrogen source and used for conveying nitrogen into the atmosphere chamber, and the heating mechanism is fixed on the side wall of the atmosphere chamber and used for heating raw materials in the sagger; the heating mechanism comprises a first heating element and a second heating element, the first heating element is positioned above the conveying roller way, and the second heating element is positioned below the conveying roller way;
the cooling section is provided with a heat dissipation chamber, a cooling water pipe and a cooling air pipe, cooling water is introduced into the cooling water pipe, the cooling air pipe is arranged at the top of the heat dissipation chamber, and the cooling water pipe and the cooling air pipe are both used for cooling the raw materials in the sagger; a thermostatic chamber is arranged in the thermostatic section, and two ends of the thermostatic chamber are respectively communicated with the atmosphere chamber and the heat dissipation chamber;
the waste gas treatment section is communicated with the temperature rise section through a flue gas pipeline, flue gas generated by the temperature rise section can enter the waste gas treatment section through the flue gas pipeline, the waste gas treatment section is provided with a treatment furnace, a combustion pipe assembly and a cooling pipe assembly, the combustion pipe assembly is inserted into the treatment furnace and is used for enabling waste gas in the treatment furnace to be combusted, and the cooling pipe assembly is communicated with an external normal-temperature air source or a low-temperature air source and is connected into the treatment furnace;
the outlet section is provided with an outlet replacement chamber from which the saggar is transported.
2. The lithium battery negative electrode material carbonization production roller kiln according to claim 1, wherein the sagger enters from an inlet side of the inlet replacement chamber and enters the atmosphere chamber from an outlet side of the inlet replacement chamber, the inlet replacement chamber comprises a first inlet sealing door and a second inlet sealing door, the first inlet sealing door is located near the inlet side of the inlet replacement chamber, and the second inlet sealing door is located near the outlet side of the inlet replacement chamber.
3. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the first heating element and the second heating element both span across two opposite side walls of the atmosphere chamber, and the middle part of the first heating element and the middle part of the second heating element can heat the middle part of the atmosphere chamber.
4. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the combustion tube assembly comprises a natural gas pipeline, a combustion air pipeline and a combustion nozzle, the natural gas pipeline is communicated with the combustion air pipeline, and the natural gas in the natural gas pipeline and the combustion air in the combustion air pipeline are mixed in the combustion nozzle and are injected into the treatment furnace through the combustion nozzle.
5. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the cooling tube assembly comprises cooling nozzles, the cooling nozzles are communicated with an external normal-temperature air source or a low-temperature air source, and the cooling nozzles are respectively arranged on the front side wall and the middle side wall of the treatment furnace.
6. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the waste gas treatment section further comprises a heat insulation layer covering the inner wall of the treatment furnace.
7. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the cooling water pipe comprises a first water pipe and a second water pipe, the first water pipe is coiled above the roller conveyor, and the second water pipe is coiled below the roller conveyor.
8. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the cooling section further comprises a cooling blower, the cooling blower is communicated with the cooling air pipe, the cooling blower is used for pumping out heat in the heat dissipation chamber, and a ventilation hole is arranged below the heat dissipation chamber.
9. The lithium battery negative electrode material carbonization production roller kiln according to claim 1, wherein the sagger enters from an inlet side of the outlet replacement chamber and is carried out from an outlet side of the inlet replacement chamber, the outlet replacement chamber comprises a first outlet sealing door and a second outlet sealing door, the first outlet sealing door is located near the inlet side of the outlet replacement chamber, and the second outlet sealing door is located near the outlet side of the outlet replacement chamber.
10. The carbonization production roller kiln for the negative electrode material of the lithium battery as claimed in claim 1, wherein the number of the atmosphere chambers is 6, the number of the thermostatic chambers is 7, and the number of the heat dissipation chambers is 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122776231.XU CN216592724U (en) | 2021-11-12 | 2021-11-12 | Lithium cell cathode material carbonization production roller kilns |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122776231.XU CN216592724U (en) | 2021-11-12 | 2021-11-12 | Lithium cell cathode material carbonization production roller kilns |
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| CN216592724U true CN216592724U (en) | 2022-05-24 |
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| CN202122776231.XU Active CN216592724U (en) | 2021-11-12 | 2021-11-12 | Lithium cell cathode material carbonization production roller kilns |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115790144A (en) * | 2023-02-07 | 2023-03-14 | 苏州田边热能科技有限公司 | Device system and method for recycling nitrogen of roller kiln |
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2021
- 2021-11-12 CN CN202122776231.XU patent/CN216592724U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115790144A (en) * | 2023-02-07 | 2023-03-14 | 苏州田边热能科技有限公司 | Device system and method for recycling nitrogen of roller kiln |
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