CN111006500A - Industrial shaft kiln for producing lime - Google Patents

Industrial shaft kiln for producing lime Download PDF

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Publication number
CN111006500A
CN111006500A CN201911149549.6A CN201911149549A CN111006500A CN 111006500 A CN111006500 A CN 111006500A CN 201911149549 A CN201911149549 A CN 201911149549A CN 111006500 A CN111006500 A CN 111006500A
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CN
China
Prior art keywords
combustion
auxiliary
kiln
air
lime
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Granted
Application number
CN201911149549.6A
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Chinese (zh)
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CN111006500B (en
Inventor
贾会平
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Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
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Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
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Priority to CN201911108779 priority Critical
Priority to CN2019111087798 priority
Application filed by Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd filed Critical Shijiazhuang Xinhua Energy Environmental Protection Technology Co Ltd
Publication of CN111006500A publication Critical patent/CN111006500A/en
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Publication of CN111006500B publication Critical patent/CN111006500B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00Shaft or like vertical or substantially vertical furnaces
    • F27B1/02Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2/00Lime, magnesia or dolomite
    • C04B2/10Preheating, burning calcining or cooling
    • C04B2/12Preheating, burning calcining or cooling in shaft or vertical furnaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00Shaft or like vertical or substantially vertical furnaces
    • F27B1/10Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/16Arrangements of tuyeres
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00Shaft or like vertical or substantially vertical furnaces
    • F27B1/10Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/22Arrangements of heat-exchange apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27DDETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004Systems for reclaiming waste heat

Abstract

The invention relates to an industrial shaft kiln for producing lime, wherein a kiln body comprises a preheating zone, a calcining zone and a cooling zone, the upper part of the preheating zone is provided with an upper suction beam, the upper part of the cooling zone is provided with a lower suction beam, the preheating zone is provided with a denitration beam, and the calcining zone is provided with an upper combustion beam, an upper auxiliary beam, a lower combustion beam and a lower auxiliary beam; the upper auxiliary beam is positioned at the lower part of the upper combustion beam, the lower auxiliary beam is positioned at the lower part of the lower auxiliary beam, and the tops of the upper combustion beam and the lower combustion beam are provided with coal injection nozzles; and two ends of the upper combustion beam and the lower combustion beam are respectively provided with an injection air gun. The industrial shaft kiln for producing lime provided by the invention has the advantages that the double-combustion beam structure is arranged in the kiln body, and the upper and lower air suction beams are arranged in a matching manner, so that the air intake of the beam type lime shaft kiln can be reduced, and the emission of waste gas is reduced.

Description

Industrial shaft kiln for producing lime
Technical Field
The invention belongs to the technical field of chemical building material production equipment, and relates to an industrial shaft kiln for producing lime.
Background
The beam lime kiln is a common technology for lime production, has the advantages of low energy consumption, good quality of lime products, strong production capacity, large operation elasticity and the like, and is widely applied to the lime production for metallurgy, chemical engineering and other purposes. The burning beam is the core equipment of the beam type lime kiln, and the limestone is calcined through the burning beam. In general, calcination requires combustion of fuel in a calcination zone, which gives off heat to heat the material being calcined. The decomposition temperature of the limestone is about 900 ℃, and the calcining temperature is generally 1000-1200 ℃. To reach the calcination temperature, a fuel with a certain calorific value is required to produce qualified lime. The beam lime kiln is mostly a gas-fired lime kiln, and natural gas, liquefied petroleum gas, coke oven gas, blast furnace gas, calcium carbide furnace gas and the like are used as fuels. Due to the limitation of fuel resources and environmental protection, gas-fired lime kilns cannot be used in some places to produce lime.
The burning beam in the existing beam-type lime kiln is limited by the process if solid fuel is used for calcining lime, and the calcining effect is not ideal enough.
Disclosure of Invention
The application aims at providing an industrial shaft kiln for producing lime, which uses solid fuel to calcine, is suitable for gas fuel limited areas to calcine lime, meets the requirements of energy conservation and environmental protection, is especially suitable for reconstruction on the basis of the existing lime kiln, makes full use of the existing resources, saves construction investment and increases the economic benefit of enterprises.
The invention provides an industrial shaft kiln for producing lime, which comprises a kiln body, a feeding system, a combustion system, a discharging system, an air supply system and a control system, wherein a feeding hole is formed in the upper part of the kiln body, and a discharging hole is formed in the lower part of the kiln body. The kiln body comprises a preheating zone, a calcining zone and a cooling zone, an upper suction beam is arranged on the upper part of the preheating zone, a lower suction beam is arranged on the upper part of the cooling zone, and the upper suction beam is connected with a waste gas discharge system through a waste gas outlet. The beam type lime shaft kiln is provided with a high-pressure fan, the preheating zone is provided with a denitration beam, and the calcining zone is provided with an upper combustion beam, an upper auxiliary beam, a lower combustion beam and a lower auxiliary beam. The upper auxiliary beam is positioned at the lower part of the upper combustion beam, the lower combustion beam is positioned at the upper part of the lower auxiliary beam, and the upper combustion beam and the lower combustion beam are arranged alternately or longitudinally and parallel. The top of the upper combustion beam and the lower combustion beam is provided with a coal injection nozzle, and an air channel is arranged around the coal injection nozzle. And two ends of the upper combustion beam and the lower combustion beam are respectively provided with an injection air gun, and the injection air guns are inserted into the box bodies of the upper combustion beam and the lower combustion beam. The high pressure fan is connected to the injection air guns at two ends through a three-way valve.
Further, go up the burning roof beam and set up to 1 ~ 30 with last auxiliary beam cooperation, lower burning roof beam sets up to 1 ~ 30 with the cooperation of lower auxiliary beam, and the denitration roof beam is 1 ~ 30.
Further, heat conducting oil pipes are arranged in the beam bodies of the upper combustion beam, the upper auxiliary beam, the lower combustion beam, the lower auxiliary beam and the lower suction beam and are connected with a heat conducting oil circulating system, and the heat conducting oil circulating system comprises a connecting pipeline, a heat conducting oil circulating pump and a heat conducting oil cooler. It is allowed to use other media having a heat transfer function instead of the heat transfer oil.
Furthermore, the waste gas discharge system comprises a heat exchanger, a dust remover, an induced draft fan and a chimney, and a waste gas outlet of the upper suction beam is connected to the chimney through the heat exchanger, the dust remover and the induced draft fan. The high pressure fan is connected to the tube pass inlet of the heat exchanger, and the tube pass outlet of the heat exchanger is connected to the injection air guns of the upper combustion beam and the lower combustion beam through a three-way valve.
Alternatively, the heat conduction oil pipes of the upper auxiliary beam and the lower auxiliary beam are replaced by structural cooling air channels. The high pressure positive blower is connected to the tube side inlet of the heat exchanger, the tube side outlet of the heat exchanger is connected to the structure cooling air channel of the upper auxiliary beam and the lower auxiliary beam through the air inlet respectively, the outlet of the structure cooling air channel of the upper auxiliary beam is connected to the ejection air gun of the upper combustion beam through the connecting pipe, and the structure cooling air channel outlet of the lower auxiliary beam is connected to the ejection air gun of the lower combustion beam.
Further, the denitration roof beam is cylinder type structure or box body type structure, and the both sides and the bottom of denitration roof beam are equipped with the denitration agent jet orifice. Denitration roof beam and denitration preparation unit connection, denitration preparation unit include liquid ammonia storage tank, liquid ammonia evaporator, ammonia buffer tank and liquid ammonia pump, and the liquid ammonia storage tank is connected to liquid ammonia evaporator through the liquid ammonia pump, and the ammonia liquid evaporator is connected to ammonia wind blender through the ammonia buffer tank, and ammonia wind blender is connected to the denitration roof beam.
Furthermore, the beam bodies of the upper combustion beam and the lower combustion beam are in a T-shaped beam structure or a rectangular structure. The fuel of the shaft kiln is solid fuel, liquid fuel or gas fuel, or the combination of the above fuels.
Further, the beam bodies of the upper auxiliary beam and the lower auxiliary beam are of concave body structures with downward notches, circulation channels are arranged on two sides of each concave body structure, and the lower suction beam is connected to the lower combustion beam or/and the upper combustion beam through the circulation channels. And a pipeline for the circulation of heat conduction oil is arranged around the circulation channel, and the circulation channel is made of refractory materials. The material of the circulation channel comprises but is not limited to refractory material or steel structure.
Furthermore, a tube pass outlet of the heat exchanger is connected to an injection air gun of the upper combustion beam and the lower combustion beam through a three-way valve or is connected to the upper auxiliary beam and the lower auxiliary beam through an air inlet.
Furthermore, the outer parts of the beam bodies of the upper combustion beam, the lower combustion beam, the upper auxiliary beam and the lower auxiliary beam are steel structures, and the inner parts of the beam bodies are lined with refractory materials. The interior or exterior or both of the beam body is lined with a refractory material.
Furthermore, two ends of the lower suction beam are provided with coal injection pipes.
Furthermore, the shaft kiln is a double-chamber kiln, the lower parts of two kiln bodies of the double-chamber kiln are provided with lower suction beams, the cooling fans are connected to cooling air inlets of the two kiln bodies, and the lower suction beams are connected to plug-in burners of the kiln bodies on two sides through three-way valves.
Furthermore, the shaft kiln is a sleeve kiln which is provided with a combustion chamber, and a first ring arch at the lower part of the combustion chamber arch bridge is of a steel structure with a cooling cavity. The first ring arch of the steel structure is provided with a heat conduction oil inlet and a heat conduction oil outlet. The heat conducting oil inlet and the heat conducting oil outlet are connected with the heat conducting oil circulating system. At least one row of combustion beams are respectively arranged at the two bottoms of the double-hearth kiln, the at least one row of combustion beams use heated cooling air injected by the air suction beams as combustion-supporting air, and the at least one row of combustion beams are allowed to use other combustion-supporting air.
The industrial shaft kiln for producing lime provided by the invention has the advantages that the double-combustion beam structure is arranged in the kiln body, and the upper and lower air suction beams are arranged in a matching manner, so that the air intake of the beam type lime shaft kiln can be reduced, and the emission of waste gas is reduced. In addition, because be provided with the denitration roof beam, can carry out denitration treatment to the waste gas that calcines lime and produce before waste gas discharge limekiln, improve limekiln's feature of environmental protection. The industrial shaft kiln for producing lime can use solid fuel, and high-temperature flue gas is returned to a combustion space by adopting an injection principle, so that the combustion efficiency of the solid fuel is improved, the content of nitrogen oxides is reduced, the fuel application range of a beam type lime kiln is enlarged, and the environmental protection performance of the lime kiln is improved. Because the solid fuel is difficult to burn out compared with the gas fuel, if the injection principle is adopted to return the high-temperature flue gas to the combustion space, the combustion efficiency of the solid fuel is improved, and the method is also favorable for reducing the content of nitrogen oxides. The invention is particularly suitable for reconstruction of the existing lime kiln, fully utilizes the existing resources, saves construction investment and increases the economic benefit of enterprises.
Drawings
FIG. 1 is a schematic structural view of an industrial shaft kiln for producing lime according to the present invention;
FIG. 2 is a view A-A of FIG. 1;
FIG. 3 is a view B-B of FIG. 1;
FIG. 4 is a schematic structural view of another embodiment of the present invention;
FIG. 5 is a schematic structural view of a third embodiment of the present invention;
FIG. 6 is a C-C view of FIG. 5;
FIG. 7 is a schematic structural view of a fourth embodiment of the present invention;
FIG. 8 is a detailed view of the calcining zone and cooling zone of FIG. 7;
FIG. 9 is a left side view of FIG. 8;
FIG. 10 is a right side view of FIG. 8;
FIG. 11 is a schematic structural view of a fifth embodiment of the present invention;
FIG. 12 is a drawing A of FIG. 11;
fig. 13 is a schematic structural view of a sixth embodiment of the present invention.
Wherein: the device comprises a kiln body 1, a kiln body 2, an upper suction beam, a denitration beam 3, a feed inlet 4, a waste gas outlet 5, a heat exchanger 6, a dust remover 7, an induced draft fan 8, a chimney 9, a high-pressure fan 10, an air injection gun 11, an upper combustion beam 12, an upper auxiliary beam 13, a lower combustion beam 14, a lower auxiliary beam 15, a lower suction beam 16, a discharge outlet 17, a three-way valve 18, a circulation channel 19, a coal injection nozzle 20, a heat conduction oil pipe 21, a refractory material 22, a coal injection pipe 23, a cooling air channel with a structure 24, an air channel 25, a box body 26, an air inlet 27, a connecting pipe 28, a kiln with double chambers 30, a cooling fan with heat conduction oil, a plug-in burner 32, a combustion chamber 33, a heat conduction oil inlet 34, a heat conduction oil outlet 35, and a first ring arch.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
Example 1
The industrial shaft kiln for producing lime, which is provided by the invention, is shown in figure 1 and comprises a kiln body 1, a feeding system, a combustion system, a discharging system, an air supply system and a control system, wherein the upper part of the kiln body is provided with a feeding hole 4, and the lower part of the kiln body is provided with a discharging hole 17. The kiln body comprises a preheating zone, a calcining zone and a cooling zone, wherein an upper suction beam 2 is arranged at the upper part of the preheating zone, a lower suction beam 16 is arranged at the upper part of the cooling zone, and the upper suction beam is connected with a waste gas discharge system through a waste gas outlet 5. The preheating zone is equipped with 4 denitration roof beams 3, and the calcining zone is equipped with 3 upper burning roof beams 12 and 3 upper auxiliary beams 13, and upper auxiliary beam 13 is located the lower part of upper burning roof beam 12, and upper burning roof beam 12 sets up with upper auxiliary beam 13 cooperation. The calcining zone is also provided with 3 lower burning beams 14 and 3 lower auxiliary beams 15, the lower burning beams 14 are positioned at the upper parts of the lower auxiliary beams 15, and the lower burning beams 14 are matched with the lower auxiliary beams 15. The upper and lower beams 12, 14 are longitudinally identically arranged, i.e. flush. The top of the upper and lower beams 12, 14 is provided with a coal injection nozzle 20, around which is provided an air passage 25. The upper combustion beam 12 and the upper auxiliary beam 13 are arranged in a matched mode, two ends of the upper combustion beam 12 and two ends of the lower combustion beam 14 are respectively provided with an injection air gun 11, and the injection air guns are inserted into the box bodies 26 of the upper combustion beam 12 and the lower combustion beam 14. The waste gas discharge system comprises a heat exchanger 6, a dust remover 7, an induced draft fan 8 and a chimney 9, and a waste gas outlet of the upper suction beam 2 is connected to the chimney 9 through the heat exchanger 6, the dust remover 7 and the induced draft fan 8. The beam lime shaft kiln is provided with a high pressure fan 10, the high pressure fan 10 is connected to a tube pass inlet of the heat exchanger 6, and a tube pass outlet of the heat exchanger 6 is connected to an injection air gun 11 of an upper combustion beam 12 and a lower combustion beam 14 through a three-way valve 18.
The beam bodies of the upper and lower combustion beams 12, 14 are rectangular in configuration. The beam bodies of the upper auxiliary beam 13 and the lower auxiliary beam 15 are of concave body structures with downward notches, and circulation channels 19 are arranged on two sides of each concave body structure. And a pipeline for circulating heat conduction oil is arranged around the circulating channel 19 and used for cooling the circulating channel 19, and the circulating channel is made of refractory materials. The upper combustion beam 12, the upper auxiliary beam 13, the lower combustion beam 14, the lower auxiliary beam 15 and the lower suction beam 16 are internally provided with heat conducting oil pipes 21, the heat conducting oil pipes 21 are connected with a heat conducting oil circulating system, and the heat conducting oil circulating system comprises a connecting pipeline, a heat conducting oil circulating pump and a heat conducting oil cooler. Denitration roof beam 3 is the cylinder type structure, and the both sides and the bottom of denitration roof beam are equipped with the denitration agent jet orifice. Denitration roof beam 3 is connected with denitration preparation unit, denitration preparation unit includes liquid ammonia storage tank, liquid ammonia evaporator, ammonia buffer tank and liquid ammonia pump, and the liquid ammonia storage tank is connected to liquid ammonia evaporator through the liquid ammonia pump, and the liquid ammonia evaporator is connected to ammonia wind blender through the ammonia buffer tank, and ammonia wind blender is connected to the denitration roof beam, allows the denitration roof beam to set up heat conduction oil pipe and also allows not to set up heat conduction oil pipe and adopts heat-resisting steel pipe. As shown in fig. 2, the outer portions of the upper combustion beam 12 and the upper auxiliary beam 13 are steel structures, and the inner portions of the beams are lined with a refractory material 22. The upper combustion beam 12 is provided with a coal injection nozzle 20, the upper part of the upper combustion beam is provided with a box body 26, an air channel 25 is arranged around the coal injection nozzle 20, and the upper combustion beam 12 and the upper auxiliary beam 13 are provided with heat conducting oil pipes 21. The lower combustion beam 14 and the lower auxiliary beam 15 have the same beam body structure as the upper combustion beam 12 and the upper auxiliary beam 13.
The operation process of the industrial shaft kiln for producing lime provided by the invention comprises the following steps: limestone materials enter the kiln body 1 through the feed inlet 4, are preheated by the preheating zone and then enter the calcining zone for calcining. The pulverized coal output from the pulverized coal bunker is conveyed to the coal injection nozzle 20 of the upper combustion beam 12 through the fuel conveying system, is injected into the inner cavity of the upper auxiliary beam 13, and is injected into the inner cavity of the lower auxiliary beam 15 from the coal injection nozzle 20 of the lower combustion beam 14. After combustion, the high-temperature flue gas is returned to the preheating zone to preheat fresh materials after calcining limestone materials under the suction action of the upper suction beam 2, and then is discharged to a waste gas discharge system through a waste gas outlet 5 of the upper suction beam 2. High-pressure air blown out by a high-pressure fan exchanges heat with waste flue gas through a heat exchanger 6, enters an upper combustion beam 12 and a lower combustion beam 14 through a three-way valve 18 alternately, and is sprayed into the upper combustion beam and the lower combustion beam through an injection air gun 11. After cooling lime in a cooling zone, cooling air entering the kiln body from the bottom enters the lower suction beam 16 under the injection action of the injection air gun 11 and enters the upper combustion beam 12 and the lower combustion beam 14 through the circulating channel 19 to participate in combustion. The cooled lime is discharged from the lime kiln through a discharge port 17. The ejection air guns 11 on the two sides work alternately, and only one side is allowed to work all the time, as shown in fig. 3, when the left ejection air gun A and the ejection air gun C work, the ejection air gun B does not work, and at the moment, the right ejection air gun E works, and the ejection air gun D and the ejection air gun F do not work. Likewise, the lower beam also operates according to the principles described above.
Example 2
Another embodiment of the present invention is shown in fig. 4, in which the upper and lower combustion beams 12 and 14 are provided with no coal injection nozzle 20, and are replaced with a lower suction beam 16 having coal injection pipes 23 at both ends thereof. The pulverized coal output by the pulverized coal bunker is conveyed to the coal injection pipes 23 at two ends of the lower suction beam 16 through the fuel conveying system, the coal injection pipes 23 at two ends alternately spray upwards into the circulating channel 19, and spray into the inner cavities of the upper combustion beam 12, the upper auxiliary beam 13, the lower combustion beam 14 and the lower auxiliary beam 15 under the injection effect of the injection air gun. The other structures and operation of this embodiment are the same as those of embodiment 1.
Example 3
In a third embodiment of the present invention, as shown in fig. 5, the upper auxiliary beam 13 and the lower auxiliary beam 15 are provided with structural cooling air channels 24, the high pressure fan 10 is connected to the tube side inlet of the heat exchanger 6, and the tube side outlet of the heat exchanger 6 is divided into two paths, which are respectively connected to the structural cooling air channels 24 of the upper auxiliary beam 13 and the lower auxiliary beam 15 through the air inlets 27. The outlet of the structure cooling air channel 24 of the upper auxiliary beam 13 is connected to the ejector air gun 11 of the upper combustion beam 12 through a connecting pipe 28, and the outlet of the structure cooling air channel 24 of the lower auxiliary beam 15 is connected to the ejector air gun 11 of the lower combustion beam 14, so that the upper auxiliary beam 13 and the lower auxiliary beam 15 are allowed to be provided with heat conducting oil pipes for circulating cooling. And a pipeline for circulating heat conduction oil is arranged around the circulating channel 19 and used for cooling the circulating channel 19, and the material of the circulating channel comprises but is not limited to a refractory material or a steel structure containing circulating cooling air cooling or a steel structure containing circulating heat conduction oil cooling.
The coal powder output by the coal powder bin is conveyed to the coal injection pipes 23 at two ends of the lower suction beam 16 through a fuel conveying system, the coal injection pipe 23 at one end is upwards injected into the circulating channel 19 and is injected into the inner cavities of the upper combustion beam 12 and the upper auxiliary beam 13 under the injection effect of the injection air gun. Meanwhile, the coal injection pipe 23 at the other end also injects upward into the circulating channel 19 and injects into the inner cavities of the lower combustion beam 14 and the lower auxiliary beam 15 under the injection action of the injection air gun. High-pressure air blown out by a high-pressure fan 10 is subjected to heat exchange with waste flue gas through a heat exchanger 6 and then divided into two paths, the two paths of high-pressure air respectively enter structural cooling air channels 24 of an upper auxiliary beam 13 and a lower auxiliary beam 15, and combustion-supporting air enters injection air guns of an upper combustion beam 12 and a lower combustion beam 14 through outlets of the structural cooling air channels 24 after being preheated to participate in combustion.
As shown in fig. 6, the outer portions of the upper combustion beam 12 and the upper auxiliary beam 13 are steel structures, and the inner portions of the beam bodies are lined with a refractory material 22. The upper part of the upper combustion beam is provided with a box body 26 and an air channel 25, the upper combustion beam 12 is provided with a heat conduction oil pipe 21, and the upper auxiliary beam 13 is provided with a structural cooling air channel 24. The structure of the lower combustion beam 14 and the lower auxiliary beam 15 is the same as that of the upper combustion beam 12 and the upper auxiliary beam 13, the outer part of the upper combustion beam 12 and the upper auxiliary beam 13 is a steel structure, and the inner part of the beam is lined with a refractory material 22. The upper part of the upper combustion beam is provided with a box body 26 and an air channel 25, the upper combustion beam 12 is provided with a heat conduction oil pipe 21, and the upper auxiliary beam 13 is provided with a structural cooling air channel 24. The lower combustion beam 14 and the lower auxiliary beam 15 have the same beam body structure as the upper combustion beam 12 and the upper auxiliary beam 13.
The other structures and operation of this embodiment are the same as those of embodiment 2.
Example 4
In a fourth embodiment of the present invention, as shown in fig. 7, injection air lances 11 are respectively provided at both ends of the upper and lower combustion beams 12 and 14 and inserted into the cases 26 of the upper and lower combustion beams 12 and 14. The top of the upper and lower beams 12, 14 is provided with a coal injection nozzle 20, around which is provided an air passage 25. The upper auxiliary beam 13 and the lower auxiliary beam 15 are provided with structural cooling air channels 24, the high-pressure fan 10 is connected to a tube pass inlet of the heat exchanger 6, and a tube pass outlet of the heat exchanger 6 is divided into two paths and is respectively connected to the structural cooling air channels 24 of the upper auxiliary beam 13 and the lower auxiliary beam 15 through air inlets 27. The outlet of the structure cooling air channel 24 of the upper auxiliary beam 13 is connected to the ejector air gun 11 of the upper combustion beam 12 through a connecting pipe 28, and the outlet of the structure cooling air channel 24 of the lower auxiliary beam 15 is connected to the ejector air gun 11 of the lower combustion beam 14, so that the upper auxiliary beam 13 and the lower auxiliary beam 15 are allowed to be provided with heat conducting oil pipes for circulating cooling. And a pipeline for circulating heat conduction oil is arranged around the circulating channel 19 and used for cooling the circulating channel 19, and the material of the circulating channel comprises but is not limited to a refractory material or a steel structure containing circulating cooling air cooling or a steel structure containing circulating heat conduction oil cooling.
The coal powder output by the coal powder bin is conveyed to the coal injection pipes 23 at two ends of the lower suction beam 16 through a fuel conveying system, the coal injection pipe 23 at one end is upwards injected into the circulating channel 19 and is injected into the inner cavities of the upper combustion beam 12 and the upper auxiliary beam 13 under the injection effect of the injection air gun. Meanwhile, the coal injection pipe 23 at the other end also injects upward into the circulating channel 19 and injects into the inner cavities of the lower combustion beam 14 and the lower auxiliary beam 15 under the injection action of the injection air gun. High-pressure air blown out by a high-pressure fan 10 is subjected to heat exchange with waste flue gas through a heat exchanger 6 and then divided into two paths, the two paths of high-pressure air respectively enter structural cooling air channels 24 of an upper auxiliary beam 13 and a lower auxiliary beam 15, and combustion-supporting air enters injection air guns of an upper combustion beam 12 and a lower combustion beam 14 through outlets of the structural cooling air channels 24 after being preheated to participate in combustion.
The details of the arrangement of the calcining zone and the cooling zone in the present embodiment are shown in fig. 7 to 9, and the lower suction beam 16 is connected to the lower burner beam 14 or to the upper burner beam 12 through the circulation channel 19. And a pipeline for the circulation of heat conduction oil is arranged around the circulation channel 19, and the circulation channel is made of refractory materials. As shown in fig. 7, the cooling air heated by the air suction beam is allowed to enter the upper combustion beam from one side and enter the lower combustion beam from the other side, thereby improving the strength and service life of the combustion beam and the auxiliary beam and increasing the flexibility of the calcination operation. All cooling air is changed into combustion-supporting air, and the heat efficiency is improved. The other structures and operation of this embodiment are the same as those of embodiment 1.
Example 5
As shown in fig. 11 and 12, the fifth embodiment of the present invention is a sleeve kiln provided with a combustion chamber 33, and a first annular arch 36 is provided at the lower part of a combustion chamber arch bridge. The first ring arch is of a steel structure with a cooling cavity, and a heat conducting oil inlet 34 and a heat conducting oil outlet 35 are formed in the first ring arch 36 of the steel structure. The heat transfer oil inlet 34 and the heat transfer oil outlet 35 are connected to a heat transfer oil circulation system including a connection pipe, a heat transfer oil circulation pump, and a heat transfer oil cooler. The first ring arch of the sleeve kiln combustion chamber arch bridge adopts a steel structure form with heat conduction oil cooling and a refractory structure form, and the service life of the sleeve kiln arch bridge is prolonged.
Example 6
The sixth embodiment of the present invention is a double-chamber kiln 30 as shown in fig. 13, which comprises a left and a right kiln bodies, a kiln body a and a kiln body B, wherein the upper parts of the two kiln bodies are provided with a feed port 4 and a flue gas outlet, the flue gas outlet is connected to a waste gas discharge system through a three-way valve, and the lower part is provided with a discharge port 17. The upper parts of the two kiln bodies are provided with inserted burners 32, and the lower parts of the two kiln bodies are provided with lower suction beams 16. The cooling fan 31 is connected to the cooling air inlets in the two kiln bodies, and the lower suction beam 16 is connected to the plug-in burners 32 of the kiln bodies on two sides through the three-way valve 18. After cooling the lime, the lime cooling air heats the lime and enters the plug-in burner 32 through the lower suction beam 16 and the three-way valve 18 to be sprayed into the kiln as combustion-supporting air. The waste heat of lime is fully utilized, so that the heat efficiency is improved.
As shown in fig. 13, at least one row of combustion beams may be respectively disposed at two bottoms of the dual-chamber kiln, and the at least one row of combustion beams uses heated cooling air ejected from the air-absorbing beams as combustion-supporting air, and also allows the at least one row of combustion beams to use other combustion-supporting air.

Claims (13)

1. An industrial shaft kiln for producing lime is a beam type lime kiln and comprises a kiln body (1), a feeding system, a combustion system, a discharging system, an air supply system and a control system, wherein a feeding hole (4) is formed in the upper part of the kiln body, and a discharging hole (17) is formed in the lower part of the kiln body; the kiln body comprises a preheating zone, a calcining zone and a cooling zone, an upper suction beam (2) is arranged at the upper part of the preheating zone, a lower suction beam (16) is arranged at the upper part of the cooling zone, and the upper suction beam is connected with an exhaust gas discharge system through an exhaust gas outlet (5); the method is characterized in that: the beam lime shaft kiln is provided with a high-pressure fan (10), the preheating zone is provided with a denitration beam (3), and the calcining zone is provided with an upper combustion beam (12), an upper auxiliary beam (13), a lower combustion beam (14) and a lower auxiliary beam (15); the upper auxiliary beam is positioned at the lower part of the upper combustion beam, the lower combustion beam (14) is positioned at the upper part of the lower auxiliary beam (15), and the upper combustion beam (12) and the lower combustion beam are arranged at intervals or are longitudinally arranged in parallel; the top parts of the upper combustion beam (12) and the lower combustion beam (14) are provided with coal injection nozzles (20), and air channels (25) are arranged around the coal injection nozzles; two ends of the upper combustion beam (12) and the lower combustion beam (14) are respectively provided with an injection air gun (11), and the injection air guns are inserted into the box bodies (26) of the upper combustion beam (12) and the lower combustion beam (14); the high-pressure fan is connected to the injection air guns (11) at two ends through a three-way valve (18).
2. The industrial shaft kiln for producing lime as set forth in claim 2, wherein: go up burning roof beam (12) and last auxiliary beam (13) cooperation and set up to 1 ~ 30, lower burning roof beam (14) and lower auxiliary beam (15) cooperation set up to 1 ~ 30, the denitration roof beam is 1 ~ 30.
3. Industrial shaft kiln for the production of lime according to claim 1 or 2, characterized in that: the heat conduction oil pipe (21) is arranged in the beam body of the upper combustion beam (12), the upper auxiliary beam (13), the lower combustion beam (14), the lower auxiliary beam (15) and the lower suction beam (16), the heat conduction oil pipe (21) is connected with a heat conduction oil circulating system, and the heat conduction oil circulating system comprises a connecting pipeline, a heat conduction oil circulating pump and a heat conduction oil cooler; it is allowed to use other media having a heat transfer function instead of the heat transfer oil.
4. An industrial shaft kiln for the production of lime according to claim 3, characterized in that: the waste gas discharge system comprises a heat exchanger (6), a dust remover (7), an induced draft fan (8) and a chimney (9), and a waste gas outlet of the upper suction beam (2) is connected to the chimney (9) through the heat exchanger (6), the dust remover (7) and the induced draft fan (8); the high-pressure fan (10) is connected to a tube pass inlet of the heat exchanger (6), and a tube pass outlet of the heat exchanger (6) is connected to the injection air guns (11) of the upper combustion beam (12) and the lower combustion beam (14) through a three-way valve (18).
5. The industrial shaft kiln for producing lime according to claim 4, wherein: the heat conducting oil pipes (21) of the upper auxiliary beam (13) and the lower auxiliary beam (15) are replaced by structural cooling air channels (24); the high-pressure fan (10) is connected to a tube pass inlet of the heat exchanger (6), a tube pass outlet of the heat exchanger (6) is connected to structural cooling air channels (24) of the upper auxiliary beam (13) and the lower auxiliary beam (15) through air inlets (27), an outlet of the structural cooling air channel (24) of the upper auxiliary beam (13) is connected to an injection air gun (11) of the upper combustion beam (12) through a connecting pipe (28), and an outlet of the structural cooling air channel (24) of the lower auxiliary beam (15) is connected to the injection air gun (11) of the lower combustion beam (14).
6. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: the denitration beam (3) is of a cylindrical structure or a box-shaped structure, and denitration agent injection holes are formed in the two sides and the bottom of the denitration beam; denitration roof beam (3) are connected with denitration preparation unit, denitration preparation unit includes liquid ammonia storage tank, liquid ammonia evaporator, ammonia buffer tank and liquid ammonia pump, the liquid ammonia storage tank is connected to liquid ammonia evaporator through the liquid ammonia pump, and the ammonia liquid evaporator is connected to ammonia wind blender through the ammonia buffer tank, and ammonia wind blender is connected to the denitration roof beam.
7. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: the beam bodies of the upper combustion beam (12) and the lower combustion beam (14) are of a T-shaped beam structure or a rectangular structure; the fuel of the shaft kiln is solid fuel, liquid fuel or gas fuel, or the combination of the above fuels.
8. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: the beam bodies of the upper auxiliary beam (13) and the lower auxiliary beam (15) are of concave body structures with downward notches, circulation channels (19) are arranged on two sides of each concave body structure, and the lower suction beam (16) is connected to the lower combustion beam (14) or/and the upper combustion beam (12) through the circulation channels (19); and steel materials including but not limited to pipelines or other structures for circulating the heat conduction oil are arranged around the circulating channel (19), and the material of the circulating channel includes but not limited to refractory materials or steel structures.
9. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: and the tube pass outlet of the heat exchanger (6) is connected to the injection air gun (11) of the upper combustion beam (12) and the lower combustion beam (14) through a three-way valve (18) or is connected to the upper auxiliary beam (13) and the lower auxiliary beam (15) through an air inlet (27).
10. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: the outer parts of the upper combustion beam (12), the lower combustion beam (14), the upper auxiliary beam (13) and the lower auxiliary beam (15) are steel structures, and the inner part or the outer part or the inner part and the outer part of the beam body are lined with refractory materials (22).
11. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: and coal injection pipes (23) are arranged at two ends of the lower suction beam (16).
12. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: the shaft kiln is a double-chamber kiln, the lower parts of two kiln bodies of the double-chamber kiln are provided with lower suction beams (16), a cooling fan (31) is connected to cooling air inlets of the two kiln bodies, and the lower suction beams (16) are connected to plug-in burners (32) of the kiln bodies on two sides through a three-way valve (18); at least one row of combustion beams are respectively arranged at the two bottoms of the double-hearth kiln, the at least one row of combustion beams use heated cooling air injected by the air suction beams as combustion-supporting air, and the at least one row of combustion beams are allowed to use other combustion-supporting air.
13. The industrial shaft kiln for producing lime as set forth in claim 1, wherein: the shaft kiln is a sleeve kiln, the sleeve kiln is provided with a combustion chamber (33), and a first ring arch (36) at the lower part of an arch bridge of the combustion chamber is of a steel structure with a cooling cavity; the first ring arch (36) of the steel structure is provided with a heat conduction oil inlet (34) and a heat conduction oil outlet (35); the heat conduction oil inlet (34) and the heat conduction oil outlet (35) are connected with the heat conduction oil circulating system.
CN201911149549.6A 2019-11-13 2019-11-21 Industrial shaft kiln for producing lime Active CN111006500B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111559877A (en) * 2020-05-27 2020-08-21 山西中齐锐能高温材料有限公司 Novel ultra-high temperature shaft kiln

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BE823741A (en) * 1973-12-24 1975-04-16 PROCESS FOR THERMAL TREATMENT OF GRAIN AND / OR PIECE PRODUCTS
KR20010097800A (en) * 2000-04-26 2001-11-08 정구일 Vertical Burning Furnace
CN201258298Y (en) * 2008-07-25 2009-06-17 贾会平 Kiln for burning lime
CN101585669A (en) * 2009-07-08 2009-11-25 贾会平 Converging type limekiln
CN101830646A (en) * 2009-03-12 2010-09-15 贾会平 Lime calcining method and star-shaped kiln device
CN101863627A (en) * 2010-07-13 2010-10-20 贾会平 Double-beam lime kiln
CN202063836U (en) * 2011-05-30 2011-12-07 石家庄市新华工业炉有限公司 Beam type lime kiln
CN105645792A (en) * 2016-03-01 2016-06-08 济南力士源机电科技有限公司 Method for roasting lime with blast furnace gas in sleeve lime kiln
CN108201778A (en) * 2018-02-09 2018-06-26 石家庄新华能源环保科技股份有限公司 A kind of limekiln combined denitration system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE823741A (en) * 1973-12-24 1975-04-16 PROCESS FOR THERMAL TREATMENT OF GRAIN AND / OR PIECE PRODUCTS
KR20010097800A (en) * 2000-04-26 2001-11-08 정구일 Vertical Burning Furnace
CN201258298Y (en) * 2008-07-25 2009-06-17 贾会平 Kiln for burning lime
CN101830646A (en) * 2009-03-12 2010-09-15 贾会平 Lime calcining method and star-shaped kiln device
CN101585669A (en) * 2009-07-08 2009-11-25 贾会平 Converging type limekiln
CN101863627A (en) * 2010-07-13 2010-10-20 贾会平 Double-beam lime kiln
CN202063836U (en) * 2011-05-30 2011-12-07 石家庄市新华工业炉有限公司 Beam type lime kiln
CN105645792A (en) * 2016-03-01 2016-06-08 济南力士源机电科技有限公司 Method for roasting lime with blast furnace gas in sleeve lime kiln
CN108201778A (en) * 2018-02-09 2018-06-26 石家庄新华能源环保科技股份有限公司 A kind of limekiln combined denitration system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111559877A (en) * 2020-05-27 2020-08-21 山西中齐锐能高温材料有限公司 Novel ultra-high temperature shaft kiln

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