CN211546343U - Energy-saving natural gas mechanical shaft kiln with profile steel structure - Google Patents
Energy-saving natural gas mechanical shaft kiln with profile steel structure Download PDFInfo
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- CN211546343U CN211546343U CN202020083805.8U CN202020083805U CN211546343U CN 211546343 U CN211546343 U CN 211546343U CN 202020083805 U CN202020083805 U CN 202020083805U CN 211546343 U CN211546343 U CN 211546343U
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Abstract
The utility model relates to an energy-conserving shaped steel structure natural gas machinery shaft kiln belongs to shaft kiln technical field. The technical scheme is as follows: a natural gas ring pipe (41) is arranged on the outer shell of the kiln body in a surrounding manner, a natural gas station (7) is communicated with the natural gas ring pipe (41) through a gas supply pipeline, a natural gas burner (12) communicated with the kiln chamber is arranged on the kiln body, the natural gas ring pipe (41) is communicated with the natural gas burner (12) through a natural gas pipeline (45), and an electromagnetic bleeding valve (15) is arranged in the natural gas pipeline (45); the natural gas filter (8), the flowmeter (9), the electromagnetic valve (10) and the electromagnetic quick-cut valve (11) are arranged on the gas pipeline. The utility model discloses an actively the effect: the environment is protected, the technical problem of changing coal into gas is solved, the emission requirement of atmospheric pollutants is met, and the requirement of calcining lime in the kiln is met.
Description
Technical Field
The utility model relates to an energy-conserving shaped steel structure natural gas machinery shaft kiln belongs to shaft kiln technical field.
Background
At present, most of the common mechanical shaft kilns for producing lime in China still use the traditional production process, white coal is used as a main fuel, and a large amount of harmful substances such as dust, sulfur dioxide and the like are generated in the production process to pollute the environment. In the face of increasingly severe environment protection situation, the production process of gradually eliminating the real coal calcined lime according to regional requirements is a problem to be solved in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an energy-saving natural gas mechanical shaft kiln with a profile steel structure, which utilizes natural gas as fuel to be used on the mechanical shaft kiln, and improves the production process of calcining lime by replacing white coal with natural gas; effectively changes the waste gas of the lime kiln, meets the emission requirement of atmospheric pollutants, realizes the application of the coal-to-gas in the mechanical shaft kiln, and solves the problems in the prior art.
The technical scheme of the utility model is that:
an energy-saving natural gas mechanical shaft kiln with a profile steel structure comprises a kiln body, a feeding system, a combustion system, an air supply cooling system, an ash discharge warehousing system, a combustion-supporting system and a dust removal and smoke exhaust system;
the feeding system comprises a feeding bin, a vibrating feeder, a weighing belt, a conveying belt, a bucket elevator and a distributing device, wherein the vibrating feeder is arranged below a discharge port of the feeding bin, an input end of the weighing belt is positioned below the vibrating feeder, an output end of the weighing belt is positioned above an input end of the conveying belt, the bucket elevator is arranged beside a kiln body, a hopper of the bucket elevator can slide up and down on the bucket elevator, the hopper is matched with the output end of the conveying belt when positioned at the bottom of the bucket elevator, and the hopper is matched with the distributing device arranged at the top of the kiln body when positioned at the top end of the bucket;
the combustion system comprises a natural gas station, a gas supply pipeline, a natural gas filter, a flowmeter, an electromagnetic valve, an electromagnetic quick-cutting valve, a natural gas burner, an electromagnetic bleeding valve, a natural gas pipeline and a natural gas ring pipe, wherein the natural gas ring pipe is arranged on a shell of the kiln body in a surrounding manner, the natural gas station is communicated with the natural gas ring pipe through the gas supply pipeline, the kiln body is provided with the natural gas burner communicated with a kiln chamber, the natural gas ring pipe is communicated with the natural gas burner through the natural gas pipeline, and the natural gas pipeline is provided with the electromagnetic bleeding valve; the gas pipeline is provided with a natural gas filter, a flowmeter, an electromagnetic valve and an electromagnetic quick-cutting valve;
the air supply cooling system comprises a cooling fan, a cooling pipeline, a pneumatic quick-switching valve II, an electric magnetic valve II and an air flow meter II, wherein the cooling fan is connected with an air cap arranged at the bottom of the kiln chamber of the kiln body through the cooling pipeline; a pneumatic quick-cutting valve II, an electric magnetic valve II and an air flow meter II are arranged on the cooling pipeline;
the ash unloading and warehousing system comprises an ash unloading bin, an electro-hydraulic gate valve I, an electro-hydraulic gate valve II, a lime conveying belt and a finished product bin, wherein the ash unloading bin is arranged at the discharge outlet of the kiln body, and the lime conveying belt is arranged between the ash unloading bin and the finished product bin; the ash discharging bin consists of a first section of ash discharging bin and a second section of ash discharging bin which are sequentially connected from top to bottom, and the bin bottoms of the first section of ash discharging bin and the second section of ash discharging bin are respectively provided with a first electro-hydraulic gate valve and a second electro-hydraulic gate valve;
the dust and smoke removing system comprises a smoke exhaust pipeline, a heat exchanger, a cyclone dust collector, a cloth bag dust collector, an induced draft fan, a desulfurizing tower and a sedimentation tank, wherein the top of the kiln body is communicated with the heat exchanger through the smoke exhaust pipeline;
the combustion-supporting system comprises an air ring pipe, a combustion-supporting air duct, a combustion-supporting fan, a combustion-supporting pipeline, a first air flow meter, a first pneumatic quick-cutting valve and a first electric magnetic valve, wherein the air ring pipe is arranged on a kiln body shell in an encircling mode and is communicated with a natural gas burner through the combustion-supporting air duct, one end of the combustion-supporting pipeline is connected with the combustion-supporting fan, the other end of the combustion-supporting pipeline penetrates through a heat exchanger and is communicated with the air ring pipe, and the first air flow meter, the first pneumatic quick-cutting valve and the.
The hood is umbrella-shaped.
And the natural gas pipeline and the combustion air duct are both provided with a handle valve and a flame arrester.
The natural gas nozzles are uniformly distributed on the kiln body in the circumferential direction, the number of the natural gas pipelines and the number of the combustion-supporting air ducts are the same as that of the natural gas nozzles, and the natural gas nozzles are respectively communicated with the natural gas ring pipe and the air ring pipe through the corresponding natural gas pipelines and the corresponding combustion-supporting air ducts.
The input end of the conveying belt is lower than the output end.
The first-section ash discharging bin and the second-section ash discharging bin are both bucket-type structures.
The flame arrester is also called a fire arrester or a pipeline flame arrester, and is equipment for preventing external flame from entering flammable and explosive gas, and preventing the flame from spreading between the equipment and the pipeline. Flame arrestors have been used in the petroleum industry as early as 1928 and are later used extensively in the mining, coal mining, water transportation and chemical industries.
The vibrating feeder, the weighing belt, the bucket elevator, the distributor, the natural gas filter, the flowmeter, the electromagnetic quick-cutting valve, the natural gas burner, the flame arrester, the electromagnetic blow-off valve, the air flowmeter, the electro-hydraulic gate valve, the heat exchanger, the cyclone dust collector, the cloth bag dust collector, the draught fan and the hood are all common equipment known in the field and can be purchased in the market.
The utility model discloses the invention is in using the natural gas to calcine lime on energy-saving mechanical shaft kiln, has improved the combustor, has solved the coal and has changed gas technical problem, satisfies the requirement that lime calcines in the kiln. The technology has the advantages of low investment, convenient operation and energy conservation, and is suitable for the current environmental protection requirement.
The utility model discloses the ash unloading adopts the two-stage process (one section ash unloading storehouse and two-stage process ash unloading storehouse), and the circulation ash unloading prevents that the dust from leaking outward, adopts the electro-hydraulic gate valve to unload the ash, finally carries the finished product storehouse to the ash.
The air supply cooling system and the combustion-supporting system respectively supply air to the blast cap and the air ring pipe through a cooling pipeline and a combustion-supporting pipeline by a cooling fan and a combustion-supporting fan. The feeding system is used for metering and feeding materials through a weighing belt by a feeding bin, and the materials are lifted to a transition bin at the top of the kiln body by a bucket elevator and then are evenly and separately discharged into a kiln chamber by a distributing device.
Combustion system, the natural gas carries the gas supply pipe after adjusting corresponding pressure through the natural gas station, the required flow in the timely adjustment kiln of natural gas after filtering shows through the flowmeter, solenoid valve outage self-closing prevents that the air supply can not cut off after the outage, the electromagnetism cuts off the fast air supply of cutting off of valve and increases the factor of safety of using the natural gas, the natural gas burner has heat-resisting wear-resisting characteristic, the handle valve plays the regulatory action to natural gas and air flow, the flame arrestor prevents that the interior flame of kiln from inverting, the electromagnetism diffuses the valve and discharges the air in the natural gas pipeline before the ignition, prevent the interior air explosion of pipeline.
The utility model discloses an actively the effect: the environment is protected, the technical problem of changing coal into gas is solved, the emission requirement of atmospheric pollutants is met, and the requirement of calcining lime in the kiln is met.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the local enlarged structure of the natural gas burner of the present invention;
in the figure: the device comprises an upper storage bin 1, a vibrating feeder 2, a weighing belt 3, a conveying belt 4, a bucket elevator 5, a distributor 6, a natural gas station 7, a natural gas filter 8, a flowmeter 9, an electromagnetic valve 10, an electromagnetic quick-cutting valve 11, a natural gas burner 12, a handle valve 13, a flame arrester 14, an electromagnetic blow-off valve 15, an air flowmeter 16, a pneumatic quick-cutting valve 17, an electric magnetic valve 18, a pneumatic quick-cutting valve 19, an electric magnetic valve 20, an air flowmeter 21, an electric-hydraulic gate valve 22, an electric-hydraulic gate valve 23, a cooling fan 24, a combustion-supporting fan 25, a heat exchanger 26, a cyclone dust collector 27, a bag dust collector 28, an induced draft fan 29, a desulfurizing tower 30, a settling pond 31, a platform guardrail 40, a natural gas loop 41, an air loop 42, an operation platform 43, a combustion-supporting air duct 44, a natural gas pipeline 45 and an air cap 46.
Detailed Description
The invention is further described with reference to the following figures and examples:
an energy-saving natural gas mechanical shaft kiln with a profile steel structure comprises a kiln body, a feeding system, a combustion system, an air supply cooling system, an ash discharge warehousing system, a combustion-supporting system and a dust removal and smoke exhaust system;
the feeding system comprises a feeding bin 1, a vibrating feeder 2, a weighing belt 3, a conveying belt 4, a bucket elevator 5 and a distributing device 6, wherein the vibrating feeder 2 is arranged below a discharge port of the feeding bin 1, an input end of the weighing belt 3 is positioned below the vibrating feeder 2, an output end of the weighing belt 3 is positioned above an input end of the conveying belt 4, the bucket elevator 5 is arranged beside a kiln body, a hopper of the bucket elevator 5 can slide up and down on the bucket elevator 5, the hopper is matched with the output end of the conveying belt 4 when positioned at the bottom of the bucket elevator 5, and the hopper is matched with the distributing device 6 arranged at the top of the kiln body when positioned at the top of the bucket elevator 5;
the combustion system comprises a natural gas station 7, an air supply pipeline, a natural gas filter 8, a flowmeter 9, an electromagnetic valve 10, an electromagnetic quick-cutting valve 11, a natural gas burner 12, an electromagnetic bleeding valve 15, a natural gas pipeline 45 and a natural gas ring pipe 41, wherein the natural gas ring pipe 41 is arranged on the casing of the kiln body in a surrounding manner, the natural gas station 7 is communicated with the natural gas ring pipe 41 through the air supply pipeline, the kiln body is provided with the natural gas burner 12 communicated with the kiln chamber, the natural gas ring pipe 41 is communicated with the natural gas burner 12 through the natural gas pipeline 45, and the natural gas pipeline 45 is provided with the electromagnetic bleeding valve 15; the natural gas filter 8, the flowmeter 9, the electromagnetic valve 10 and the electromagnetic quick-cutting valve 11 are arranged on the gas pipeline;
the air supply cooling system comprises a cooling fan 24, a cooling pipeline, a pneumatic quick-switching valve II 19, an electric magnetic valve II 20 and an air flow meter II 21, and the cooling fan 24 is connected with an air cap arranged at the bottom of a kiln chamber of the kiln body through the cooling pipeline; a pneumatic quick-cutting valve II 19, an electric magnetic valve II 20 and an air flow meter II 21 are arranged on the cooling pipeline;
the ash unloading and warehousing system comprises an ash unloading bin, an electro-hydraulic gate valve I22, an electro-hydraulic gate valve II 23, a lime conveying belt and a finished product bin, wherein the ash unloading bin is arranged at the discharge outlet of the kiln body, and the lime conveying belt is arranged between the ash unloading bin and the finished product bin; the ash discharging bin consists of a first section of ash discharging bin and a second section of ash discharging bin which are sequentially connected from top to bottom, and the bin bottoms of the first section of ash discharging bin and the second section of ash discharging bin are respectively provided with an electro-hydraulic gate valve I22 and an electro-hydraulic gate valve II 23;
the dedusting and smoke discharging system comprises a smoke discharging pipeline, a heat exchanger 26, a cyclone dust collector 27, a bag dust collector 28, an induced draft fan 29, a desulfurizing tower 30 and a settling pond 31, wherein the top of the kiln body is communicated with the heat exchanger 26 through the smoke discharging pipeline, the heat exchanger 26 is connected with the cyclone dust collector 27, the cyclone dust collector 27 is connected with the bag dust collector 28 and then connected with the desulfurizing tower 30 through the induced draft fan 29, and the settling pond 31 is arranged in the desulfurizing tower 30;
the combustion-supporting system comprises an air loop 42, a combustion-supporting air duct 44, a combustion-supporting fan 25, a combustion-supporting pipeline, a first air flow meter 16, a first pneumatic quick-cutting valve 17 and a first electric magnetic valve 18, wherein the air loop 42 is arranged on the kiln body shell in a surrounding mode, the air loop 42 is communicated with the natural gas burner 12 through the combustion-supporting air duct 44, one end of the combustion-supporting pipeline is connected with the combustion-supporting fan 25, the other end of the combustion-supporting pipeline penetrates through the heat exchanger 26 and then is communicated with the air loop 42, and the first air flow meter 16, the first pneumatic quick-cutting valve 17 and the.
The hood is umbrella-shaped.
And the natural gas pipeline 45 and the combustion air duct 44 are respectively provided with a handle valve 13 and a flame arrester 14.
The natural gas nozzles 12 are distributed on the kiln body in the circumferential direction, the number of the natural gas pipelines 45 and the number of the combustion air ducts 44 are the same as that of the natural gas nozzles 12, and the natural gas nozzles 12 are respectively communicated with the natural gas circular pipe 41 and the air circular pipe 42 through the corresponding natural gas pipelines 45 and the corresponding combustion air ducts 44.
The input end of the conveyor belt 4 is lower than the output end.
Be equipped with operation platform 43 on the kiln body, be equipped with platform guardrail 40 on operation platform 43, make things convenient for personnel to overhaul.
The first-section ash discharging bin and the second-section ash discharging bin are both bucket-type structures.
The specific embodiment of the invention is as follows with reference to the attached drawings 1-2:
the energy-saving natural gas mechanical shaft kiln with the steel structure comprises a kiln body, a feeding system, a combustion system, an air supply cooling system, an ash discharge warehousing system, a combustion-supporting system and a dust removal and smoke exhaust system, wherein the kiln body, the feeding system, the combustion system, the air supply cooling system, the ash discharge warehousing system, the combustion-supporting system and the dust removal and smoke exhaust system are fixed on.
Limestone is conveyed to a weighing belt 3 through a vibrating feeder 2 by a feeding bin 1 and is conveyed through a conveying belt 4, limestone is conveyed to the top of a kiln body by a bucket elevator 5, the mechanical distributor at the top of the kiln body distributes the material evenly, and the limestone falls into a kiln chamber to complete the feeding process.
The natural gas in the natural gas station 7 sequentially passes through the gas supply pipeline, the natural gas ring pipe 41 and the natural gas pipeline 45 and enters the natural gas burner 12; combustion-supporting air generated by the combustion-supporting fan 25 also enters the natural gas burner 12 after passing through a combustion-supporting pipeline, an air loop 42 and a combustion-supporting air pipe 44; the combustion-supporting air and the natural gas are mixed in the natural gas burner 12 and then ignited to calcine the limestone.
Cooling air generated by the cooling fan 24 enters the bottom of the kiln chamber through a cooling pipeline, cools lime at the bottom and takes part in combustion to supply oxygen, so that natural gas is combusted more fully.
And after the calcination is finished, opening the first electro-hydraulic gate valve 22, discharging the lime to a second-stage ash discharge bin, and opening the second electro-hydraulic gate valve 23, discharging the lime to a finished product bin through a lime conveying belt.
Wherein, the natural gas station 7 supplies the kiln body gas source, the natural gas filter 8 filters impurities possibly existing in the gas supply pipeline, and the filtered natural gas is displayed by the flowmeter 9 to adjust the required flow in the kiln in time; the electromagnetic valve 10 is automatically closed when power is off, so that the air source cannot be cut off after power is off; the secondary electromagnetic quick-cutting valve quickly cuts off the gas source, so that the safety factor of using natural gas is increased; the natural gas burner 12 is a burner for calcining lime in a kiln body, has the characteristics of heat resistance and wear resistance, and has the function of adjusting the flow of natural gas and air by adjusting a handle valve 13; the flame arrester 14 prevents the inversion of the flame in the kiln, and the air in the natural gas pipeline is discharged before the electromagnetic blow-off valve 15 is ignited, so that the explosion of the air in the pipeline is prevented.
The first air flow meter 16 detects and adjusts air flow to guarantee use of air in the kiln, the first pneumatic quick-cutting valve 17 quickly cuts off an air source of the ventilating duct to prevent accidents caused by air leakage in the kiln, and the first electric magnetic valve 18 is closed in a power-off mode.
When the pneumatic quick-cutting valve II 19 fails, the pneumatic quick-cutting valve II can be closed in time to prevent the gas in the kiln from being discharged outside by the cooling fan to cause dangerous accidents, the electric magnetic valve II 20 adjusts the air flow, and the air flow meter II 21 adjusts the cooling air quantity required in the kiln in time according to the display.
The heat exchanger 26 exchanges heat of the kiln top exhaust gas and then enters the kiln again through the air ring pipe 42 to increase the combustion temperature. The cyclone dust collector 27 solves the problem of coarse particles before waste gas enters the cloth bag for dust collection, reduces the temperature before the waste gas enters the cloth bag, and the cloth bag dust collector 28 collects dust in the waste gas to reach the emission standard. The induced draft fan 29 guides the top exhaust gas in the kiln to the heat exchanger, the cyclone dust collector and the bag dust collector and then to the desulfurizing tower, the desulfurizing tower 30 sprays and washes the dust containing sulfur in the air, and the sedimentation tank 31 sediments the dust and sulfur dioxide in the air to meet the discharge requirement of water.
In this example, the flame arrester was manufactured by shanghai hua teflon valve manufacturing ltd, and its model number was GZW-1, specification was DA50, and pressure was 16 MPa.
Claims (4)
1. The utility model provides an energy-conserving shaped steel structure natural gas machinery shaft kiln which characterized in that: comprises a kiln body, a feeding system, a combustion system, an air supply and cooling system, an ash discharge and warehousing system, a combustion-supporting system and a dust removal and smoke exhaust system;
the feeding system comprises a feeding bin (1), a vibrating feeder (2), a weighing belt (3), a conveying belt (4), a bucket elevator (5) and a distributing device (6), wherein the vibrating feeder (2) is arranged below a discharge port of the feeding bin (1), the input end of the weighing belt (3) is positioned below the vibrating feeder (2), the output end of the weighing belt (3) is positioned above the input end of the conveying belt (4), the bucket elevator (5) is arranged beside a kiln body, a hopper of the bucket elevator (5) can slide up and down on the bucket elevator (5), the hopper is matched with the output end of the conveying belt (4) when positioned at the bottom of the bucket elevator (5), and the hopper is matched with the distributing device (6) arranged at the top of the kiln body when positioned at the top of the bucket elevator (5);
the combustion system comprises a natural gas station (7), a gas supply pipeline, a natural gas filter (8), a flowmeter (9), an electromagnetic valve (10), an electromagnetic quick-cutting valve (11), a natural gas burner (12), an electromagnetic bleeding valve (15), a natural gas pipeline (45) and a natural gas ring pipe (41), wherein the natural gas ring pipe (41) is arranged on a shell of the kiln body in a surrounding mode, the natural gas station (7) is communicated with the natural gas ring pipe (41) through the gas supply pipeline, the kiln body is provided with the natural gas burner (12) communicated with a kiln chamber, the natural gas ring pipe (41) is communicated with the natural gas burner (12) through the natural gas pipeline (45), and the electromagnetic bleeding valve (15) is arranged on the natural gas pipeline (45); the natural gas filter (8), the flowmeter (9), the electromagnetic valve (10) and the electromagnetic quick-cutting valve (11) are arranged on the gas pipeline;
the air supply cooling system comprises a cooling fan (24), a cooling pipeline, a second pneumatic quick-switching valve (19), a second electromagnetic valve (20) and a second air flow meter (21), and the cooling fan (24) is connected with an air cap (46) arranged at the bottom of the kiln chamber of the kiln body through the cooling pipeline; a pneumatic quick-cutting valve II (19), an electric magnetic valve II (20) and an air flow meter II (21) are arranged on the cooling pipeline;
the ash unloading warehousing system comprises an ash unloading warehouse, an electro-hydraulic gate valve I (22), an electro-hydraulic gate valve II (23), a lime conveying belt and a finished product warehouse, wherein the ash unloading warehouse is arranged at the discharge outlet of the kiln body, and the lime conveying belt is arranged between the ash unloading warehouse and the finished product warehouse; the ash discharging bin consists of a first section of ash discharging bin and a second section of ash discharging bin which are sequentially connected from top to bottom, and the bin bottoms of the first section of ash discharging bin and the second section of ash discharging bin are respectively provided with an electro-hydraulic gate valve I (22) and an electro-hydraulic gate valve II (23);
the dedusting and smoke discharging system comprises a smoke discharging pipeline, a heat exchanger (26), a cyclone dust collector (27), a cloth bag dust collector (28), an induced draft fan (29), a desulfurizing tower (30) and a settling pond (31), wherein the top of the kiln body is communicated with the heat exchanger (26) through the smoke discharging pipeline, the heat exchanger (26) is connected with the cyclone dust collector (27), the cyclone dust collector (27) is connected with the cloth bag dust collector (28) and then is connected with the desulfurizing tower (30) through the induced draft fan (29), and the settling pond (31) is arranged in the desulfurizing tower (30);
the combustion-supporting system comprises an air loop pipe (42), a combustion-supporting air pipe (44), a combustion-supporting fan (25), a combustion-supporting pipeline, a first air flow meter (16), a first pneumatic quick-cutting valve (17) and a first electric magnetic valve (18), the air loop pipe (42) is arranged on a kiln body shell in an encircling mode, the air loop pipe (42) is communicated with a natural gas burner (12) through the combustion-supporting air pipe (44), one end of the combustion-supporting pipeline is connected with the combustion-supporting fan (25), the other end of the combustion-supporting pipeline is communicated with the air loop pipe (42) after penetrating through a heat exchanger (26), the combustion-supporting pipeline is provided with the first air flow meter (16), the first pneumatic quick-.
2. The energy-saving steel structure natural gas mechanical shaft kiln as claimed in claim 1, wherein: and the natural gas pipeline (45) and the combustion air duct (44) are respectively provided with a handle valve (13) and a flame arrester (14).
3. The energy-saving steel structure natural gas mechanical shaft kiln as claimed in claim 2, characterized in that: the natural gas nozzles (12) are distributed on the kiln body in the circumferential direction, the number of the natural gas pipelines (45) and the number of the combustion air ducts (44) are the same as that of the natural gas nozzles (12), and the natural gas nozzles (12) are respectively communicated with the natural gas circular pipe (41) and the air circular pipe (42) through the corresponding natural gas pipelines (45) and the corresponding combustion air ducts (44).
4. The energy-saving steel structure natural gas mechanical shaft kiln as claimed in claim 1, wherein: the input end of the conveying belt (4) is lower than the output end.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020083805.8U CN211546343U (en) | 2020-01-15 | 2020-01-15 | Energy-saving natural gas mechanical shaft kiln with profile steel structure |
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| CN202020083805.8U CN211546343U (en) | 2020-01-15 | 2020-01-15 | Energy-saving natural gas mechanical shaft kiln with profile steel structure |
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