CN211814179U - External combustion type limestone decomposition kiln equipment - Google Patents
External combustion type limestone decomposition kiln equipment Download PDFInfo
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- CN211814179U CN211814179U CN201922406225.8U CN201922406225U CN211814179U CN 211814179 U CN211814179 U CN 211814179U CN 201922406225 U CN201922406225 U CN 201922406225U CN 211814179 U CN211814179 U CN 211814179U
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Abstract
The utility model discloses an external combustion formula limestone decomposition kiln equipment, equipment include pan feeding device, rotary kiln barrel, casing, gas piping, combustion fan, combustion air pipeline, combustor, combustion chamber, flue gas pipeline, carbon dioxide trachea way, discharging device. On one hand, the equipment can decompose limestone to produce high-purity and high-activity calcium oxide products and high-purity carbon dioxide gas; on the other hand, the method can fully utilize the tailings of other calcium oxide production lines, greatly improve the utilization rate of limestone mine resources in China, and solve the problem that the limestone resources face exhaustion.
Description
Technical Field
The utility model relates to a lime stone decomposition kiln equipment, in particular to an external combustion type lime stone decomposition kiln equipment.
Background
Limestone is the main raw material for producing calcium oxide products. The calcium oxide is the best material for moisture absorption, moisture absorption and drying of plastics, rubber and chemical raw materials, and can be widely applied to the fields of metallurgy cosolvent, chemical raw materials, building coatings, papermaking, wastewater purification treatment, waste incineration, acid-base neutralization in metal factories, bleaching, drying, desulfurization and deacidification in thermal power plants, petroleum lubricants, foods, medicines and the like.
At present, the equipment for producing calcium oxide by decomposing limestone mainly comprises an internal combustion rotary kiln and a vertical kiln, and because limestone is directly contacted with flame and fuel in the production processes of the two equipment, the produced calcium oxide has low activity, overburning and sintering phenomena and poor quality, and the yield and the quality of products of downstream users are influenced. And limited by the structure and the process of the furnace body, certain requirements are required for the granularity of the mineral aggregate entering the furnace, for example, the size of the mineral aggregate entering the vertical kiln is required to be 60-120 mm, and the internal combustion type rotary kiln is required to be 20-40 mm, so that a large amount of small-particle mineral aggregate and powder smaller than 20mm cannot be utilized, and the part of the mineral aggregate (namely tailings) is usually discarded or used for paving, thereby causing great waste of mineral resources. Therefore, the development of kiln equipment which can produce high-activity calcium oxide products by using tailings is imperative.
Disclosure of Invention
In view of the problems of the prior limestone decomposition kiln equipment, the utility model provides an external combustion type limestone decomposition kiln equipment. On one hand, the equipment can decompose limestone to produce high-purity and high-activity calcium oxide products and high-purity carbon dioxide gas; on the other hand, the method can recycle the tailings of other calcium oxide production lines, so that the utilization rate of limestone mine resources in China is greatly improved, and the problem that the limestone resources face exhaustion is solved.
The utility model adopts the technical proposal that: an external combustion type limestone decomposition kiln equipment is characterized in that: the equipment comprises a feeding device, a rotary kiln cylinder, a shell, a gas pipeline, a combustion-supporting fan, a combustion-supporting air pipeline, a combustor, a combustion chamber, a flue gas pipeline, a carbon dioxide gas pipeline and a discharging device; the outlet of the feeding device is connected with the inlet of the rotary kiln cylinder, the outlet of the rotary kiln cylinder is connected with the discharging device, the outlet of the discharging device is connected with the inlet of the waste heat boiler, one end of a carbon dioxide gas pipeline is connected with the gas outlet of the discharging device, and the other end of the carbon dioxide gas pipeline is connected with the inlet of the waste heat boiler; the gas pipeline is connected with the gas inlets of the plurality of burners; one end of the combustion-supporting air pipeline is connected with an outlet of the combustion-supporting fan, and the other end of the combustion-supporting air pipeline is connected with combustion-supporting air inlets of a plurality of burners; one end of the flue gas pipeline is connected with the outlet of the combustion chamber, and the other end of the flue gas pipeline is connected with the inlet of the waste heat boiler; the rotary kiln cylinder is arranged in the combustion chamber, a shell is arranged outside the combustion chamber, and a heat insulation layer is arranged in the shell; the plurality of burners are uniformly arranged on the side surface of the combustion chamber.
The rotary kiln cylinder comprises a cylinder body, a supporting device, a transmission device and a sealing device, wherein the installation angle of the cylinder body is 1-3 degrees; the two supporting devices are respectively arranged at the front end and the rear end of the cylinder body; the transmission device is arranged between the barrel feeding port and the front end supporting device; the sealing device is arranged at the joint of the cylinder body and the discharging device.
Compared with the prior art, the utility model has the advantages that:
(1) the product quality is high: because the mineral aggregate is not contacted with flame and fuel in the calcining process, the produced calcium oxide has high activity and purity, the mineral aggregate cannot be over-burnt or under-burnt, impurities in the fuel cannot be mixed into the product, the calcium oxide consumption of downstream users can be reduced by more than 20 percent, and the product quality of the downstream users can be improved; the produced carbon dioxide gas is directly decomposed by mineral aggregate, has high purity and low content of harmful substances, and can produce food-grade liquid carbon dioxide and dry ice by removing the harmful substances.
(2) And the production cost is low: the equipment can utilize the tailings of other calcium oxide production lines for production, and the limestone entering the kiln can be powder, particles or a powder-particle mixture, so that waste is changed into valuable, the utilization rate of limestone mine resources in China is greatly improved, and the problem that the limestone resources face exhaustion is solved.
(3) The waste heat produced in the production process of the device can be recycled and used for power generation, the comprehensive energy consumption is lower than that of other production processes of calcium oxide, and the production cost is reduced while the energy consumption is reduced.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
fig. 2 is a front view of the present invention;
fig. 3 is a cross-sectional view of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, an external combustion type limestone decomposition kiln device comprises a feeding device 1, a rotary kiln cylinder 2, a shell 3, a gas pipeline 4, a combustion fan 5, a combustion air pipeline 6, a combustor 7, a combustion chamber 8, a flue gas pipeline 9, a carbon dioxide gas pipeline 10 and a discharging device 11; wherein, the outlet of the feeding device 1 is connected with the feeding hole of the rotary kiln cylinder 2, the discharging hole of the rotary kiln cylinder 2 is connected with the discharging device 11, the discharging hole of the discharging device 11 is connected with the inlet of the waste heat boiler, one end of the carbon dioxide gas pipeline 10 is connected with the gas outlet of the discharging device 11, and the other end is connected with the inlet of the waste heat boiler; the gas pipeline 4 is connected with gas inlets of a plurality of burners 7; one end of a combustion-supporting air pipeline 6 is connected with an outlet of the combustion-supporting fan 5, and the other end of the combustion-supporting air pipeline is connected with combustion-supporting air inlets of a plurality of burners 7; one end of a flue gas pipeline 9 is connected with an outlet of the combustion chamber 8, and the other end of the flue gas pipeline is connected with an inlet of the waste heat boiler; the rotary kiln cylinder body 2 is arranged in the combustion chamber 8, the shell 3 is arranged outside the combustion chamber 8, and the shell 3 is internally provided with a heat-insulating layer; the heat-insulating material is a refractory brick and a high-aluminum fiber block; the plurality of burners 7 are uniformly installed on the side of the combustion chamber 8.
As shown in fig. 2, the rotary kiln cylinder body 2 comprises a cylinder body 2-1, a supporting device 2-2, a transmission device 2-3 and a sealing device 2-4, wherein the installation angle of the cylinder body 2-1 is 1-3 degrees; the two supporting devices 2-2 are respectively arranged at the front end and the rear end of the cylinder body 2-1; the transmission device 2-3 is arranged between the feeding port of the barrel 2-1 and the front end supporting device 2-2; the sealing device 2-4 is arranged at the joint of the cylinder 2-1 and the discharging device 11.
The working principle of the external combustion limestone decomposition kiln equipment is as follows: and the combustion-supporting fan sends combustion-supporting air to the combustor, and the coal gas is sent to the combustor through a coal gas pipeline and is used for calcining the mineral aggregate. Limestone mineral aggregate is sent to a feeding end (namely a high end) of a rotary kiln cylinder body, and the mineral aggregate does circular motion around the cylinder body and moves from the high end to the low end under the rotation and inclination action of the rotary kiln cylinder body. The mineral aggregate is discharged through a discharging device after being decomposed in the cylinder, the discharged high-temperature calcium oxide powder and particles enter a waste heat boiler to be cooled, and the waste heat boiler recovers the rest heat for power generation. And carbon dioxide gas generated by mineral aggregate decomposition enters a waste heat boiler for heat exchange and cooling for further purification, and the waste heat boiler recovers the rest heat for power generation. The waste gas after combustion in the combustion chamber enters a waste heat boiler through a flue gas pipeline for heat exchange, and the waste heat boiler recovers the rest heat for power generation.
The limestone entering the kiln can be powder, particles or a mixture of powder and particles. The limestone mineral aggregate is crushed to be less than 5mm before being put into a kiln, the calcining temperature of the mineral aggregate in the kiln is 900-1350 ℃, the calcining time is 30-50 min, and the limestone mineral aggregate is not contacted with flame and fuel. The gas for combustion comes from a gas generating device, and the combustion-supporting air is normal-temperature air.
Claims (2)
1. An external combustion type limestone decomposition kiln equipment is characterized in that: the equipment comprises a feeding device (1), a rotary kiln cylinder (2), a shell (3), a gas pipeline (4), a combustion fan (5), a combustion air pipeline (6), a burner (7), a combustion chamber (8), a flue gas pipeline (9), a carbon dioxide gas pipeline (10) and a discharging device (11); wherein, the outlet of the feeding device (1) is connected with the feeding hole of the rotary kiln cylinder (2), the discharging hole of the rotary kiln cylinder (2) is connected with the discharging device (11), the discharging hole of the discharging device (11) is connected with the inlet of the waste heat boiler, one end of the carbon dioxide gas pipeline (10) is connected with the gas outlet of the discharging device (11), and the other end is connected with the inlet of the waste heat boiler; the gas pipeline (4) is connected with gas inlets of a plurality of burners (7); one end of a combustion air pipeline (6) is connected with an outlet of the combustion fan (5), and the other end of the combustion air pipeline is connected with combustion air inlets of a plurality of burners (7); one end of the flue gas pipeline (9) is connected with the outlet of the combustion chamber (8), and the other end is connected with the inlet of the waste heat boiler; the rotary kiln cylinder body (2) is arranged in the combustion chamber (8), the shell (3) is arranged outside the combustion chamber (8), and a heat-insulating layer is arranged in the shell (3); the plurality of burners (7) are uniformly arranged on the side surface of the combustion chamber (8).
2. An external combustion limestone decomposition kiln plant according to claim 1, characterized in that: the rotary kiln cylinder body (2) comprises a cylinder body (2-1), a supporting device (2-2), a transmission device (2-3) and a sealing device (2-4), and the installation angle of the cylinder body (2-1) is 1-3 degrees; the two supporting devices (2-2) are respectively arranged at the front end and the rear end of the cylinder body (2-1); the transmission device (2-3) is arranged between the feeding port of the barrel (2-1) and the front end supporting device (2-2); the sealing device (2-4) is arranged at the joint of the cylinder body (2-1) and the discharging device (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922406225.8U CN211814179U (en) | 2019-12-27 | 2019-12-27 | External combustion type limestone decomposition kiln equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922406225.8U CN211814179U (en) | 2019-12-27 | 2019-12-27 | External combustion type limestone decomposition kiln equipment |
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| CN211814179U true CN211814179U (en) | 2020-10-30 |
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| CN201922406225.8U Active CN211814179U (en) | 2019-12-27 | 2019-12-27 | External combustion type limestone decomposition kiln equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115724601A (en) * | 2022-12-27 | 2023-03-03 | 贺洪江 | Lime kiln capable of producing high-purity calcium oxide and carbon dioxide simultaneously |
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2019
- 2019-12-27 CN CN201922406225.8U patent/CN211814179U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115724601A (en) * | 2022-12-27 | 2023-03-03 | 贺洪江 | Lime kiln capable of producing high-purity calcium oxide and carbon dioxide simultaneously |
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