CN110590192B - Heat accumulating type lime rotary kiln - Google Patents
Heat accumulating type lime rotary kiln Download PDFInfo
- Publication number
- CN110590192B CN110590192B CN201910979632.XA CN201910979632A CN110590192B CN 110590192 B CN110590192 B CN 110590192B CN 201910979632 A CN201910979632 A CN 201910979632A CN 110590192 B CN110590192 B CN 110590192B
- Authority
- CN
- China
- Prior art keywords
- kiln
- rotary kiln
- preheater
- rotary
- lime
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000004571 lime Substances 0.000 title claims abstract description 79
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 76
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 claims abstract description 102
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 47
- 239000003546 flue gas Substances 0.000 claims description 47
- 238000001816 cooling Methods 0.000 claims description 44
- 239000007789 gas Substances 0.000 claims description 41
- 239000002912 waste gas Substances 0.000 claims description 34
- 239000006028 limestone Substances 0.000 claims description 26
- 235000019738 Limestone Nutrition 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000001172 regenerating effect Effects 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 12
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 6
- 238000004891 communication Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000004449 solid propellant Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 239000002918 waste heat Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- 240000006909 Tilia x europaea Species 0.000 description 55
- 238000001354 calcination Methods 0.000 description 10
- 238000007599 discharging Methods 0.000 description 7
- 239000007921 spray Substances 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000005997 Calcium carbide Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
Abstract
The application belongs to the technical field of chemical material production equipment, and particularly relates to a heat accumulating type lime rotary kiln which comprises a first rotary kiln and a second rotary kiln. A first kiln tail cover is arranged at the kiln tail end of the first rotary kiln, and a first kiln tail burner is arranged on the first kiln tail cover; a kiln tail end of the second rotary kiln is provided with a second kiln tail cover, and a second kiln tail burner is arranged on the second kiln tail cover; a first preheater is arranged between the first kiln tail cover and the first rotary kiln; and a second preheater is arranged between the second kiln tail cover and the second rotary kiln. The heat accumulating type lime rotary kiln provided by the embodiment of the application does not need to be provided with an additional waste heat recovery device outside the kiln body, only utilizes the space at the kiln tail in the kiln body to arrange the first preheater and the second preheater, does not increase the occupied area of the lime rotary kiln, and solves the problems that the cost of the existing lime rotary kiln is higher and the occupied area is larger in the waste heat utilization process.
Description
Technical Field
The application belongs to the technical field of chemical material production equipment, and particularly relates to a heat accumulating type lime rotary kiln.
Background
The rotary kiln is a rotary kiln and belongs to building material production equipment. Rotary kilns can be divided into cement kilns, metallurgical chemical kilns and lime kilns according to the different materials to be treated. The lime rotary kiln is a kiln which is widely used for calcining small-particle materials, is suitable for being applied to enterprises producing steel, calcium carbide and nonferrous metals, can directly calcine 10-40mm of fine-grained raw material limestone or dolomite, and has the characteristics of good raw material adaptability, high yield, uniform product, high activity, stable production operation and the like.
At present, when industrial waste heat generated in the calcining process is recycled by a common lime rotary kiln, a large-scale waste heat recovery device is additionally arranged, the floor area of the lime rotary kiln is increased, and the cost of waste heat utilization is high.
Disclosure of Invention
In view of this, the embodiment of the application provides a heat accumulating type lime rotary kiln to solve the problems of high cost and large occupied area in the waste heat utilization process of the existing common lime rotary kiln.
The embodiment of the application provides a heat accumulation formula lime rotary kiln includes: the rotary kiln comprises a first rotary kiln, a second rotary kiln, a first rotary kiln transmission device arranged on the first rotary kiln and a second rotary kiln transmission device arranged on the second rotary kiln; a first kiln tail cover is arranged at the kiln tail end of the first rotary kiln, and a first kiln tail burner is arranged on the first kiln tail cover; a second kiln tail cover is arranged at the kiln tail end of the second rotary kiln, and a second kiln tail burner is arranged on the second kiln tail cover; a first preheater is arranged between the first kiln tail cover and the first rotary kiln; a second preheater is arranged between the second kiln tail cover and the second rotary kiln; allowing the cylinder diameter of the first preheater to be smaller than that of the first rotary kiln and also allowing the cylinder diameter of the second preheater to be smaller than that of the second rotary kiln; a first kiln head cover is arranged at the kiln head end of the first rotary kiln, a second kiln head cover is arranged at the kiln head end of the second rotary kiln, and the first kiln head cover is connected with the second kiln head cover through a communicating pipeline; the first kiln head cover is provided with a first kiln head burner, and the second kiln head cover is provided with a second kiln head burner.
In some embodiments of the present application, the first preheater is configured to form a ramp-shaped charge level at a kiln end of the first rotary kiln; the second preheater is used for forming a slope-shaped charge level at the tail end of the second rotary kiln; materials with slope-shaped charge levels formed in the first preheater and materials entering the first rotary kiln through a first rotary kiln charge door on the first rotary kiln are cooled and preheated by the first rotary kiln charge door; and materials with slope-shaped charge level formed in the second preheater and materials entering the second rotary kiln through a second rotary kiln charge door on the second rotary kiln are cooled and preheated by the smoke gas together.
In some embodiments of the present application, the regenerative lime rotary kiln further comprises a spiral cooler; the spiral cooler is arranged between the first rotary kiln and the second rotary kiln, is connected with the first rotary kiln through the first kiln head cover, and is connected with the second rotary kiln through the second kiln head cover; the spiral cooler is provided with a lime cooling air inlet and a lime cooling air outlet.
In some embodiments of the present application, the heat accumulating type lime rotary kiln further includes a kiln body cooling fan and heat collecting covers sleeved outside the first rotary kiln, the second rotary kiln and the spiral cooler; the heat collection cover is provided with a gas inlet and a gas outlet, the kiln body cooling fan is connected with the heat collection cover through the gas inlet, and the gas outlet is connected with the lime cooling air inlet; a first air distribution plate and a second air distribution plate are respectively arranged at two ends of the heat collection cover, and a third air distribution plate for isolating the first rotary kiln and the second rotary kiln is arranged in the heat collection cover; the heat-insulating layer is arranged on the inner side, the outer side or the inner side and the outer side of the heat-collecting cover; and heat insulating layers are arranged on the inner sides, the outer sides or the inner and outer sides of the heat pipelines, the preheaters and the coolers.
In some embodiments of the present application, when the temperature of the flue gas discharged from the first flue gas outlet disposed on the first kiln tail cover or the second flue gas outlet disposed on the second kiln tail cover is greater than or equal to 150 ℃, the regenerative lime rotary kiln further comprises a vertical preheater; the vertical preheater is provided with a waste gas inlet and a waste gas outlet; the first flue gas outlet and the second flue gas outlet are respectively connected with a waste gas inlet of the vertical preheater through a No. 3 three-way valve, and a waste gas outlet of the vertical preheater is connected with a waste gas discharge system; the vertical preheater is provided with a material inlet and a material outlet; the heat accumulating type lime rotary kiln also comprises a limestone bin; the limestone bin is connected with the vertical preheater through the material inlet.
In some embodiments of the present application, a first gas seal chamber is provided at the connection between the first rotary kiln and the first preheater; a second air seal chamber is arranged at the joint between the second rotary kiln and the second preheater; a first air sealing chamber air inlet is formed in the first air sealing chamber, and a second air sealing chamber air inlet is formed in the second air sealing chamber; the waste gas discharge system is respectively connected with the air inlet of the first air seal chamber and the air inlet of the second air seal chamber through a booster fan; the first air seal chamber and the second air seal chamber are both sealed at high pressure, and used air sources are low-temperature waste gas from a waste gas discharge system; the kiln head, the kiln tail and the joints of all parts can be provided with air sealing devices; the gas source required by each gas seal device can be from low-temperature flue gas discharged by a waste gas discharge system; allowing the burner to inject the flue gas to assist in discharging the flue gas; the first rotary kiln is provided with a first rotary kiln charging hole, and the second rotary kiln is provided with a second rotary kiln charging hole; part of cold materials from the limestone bin directly enter a first preheater and a second preheater; the other part enters a vertical preheater; and hot materials from the vertical preheater enter the first rotary kiln through a first rotary kiln feed inlet and enter the second rotary kiln through a second rotary kiln feed inlet.
In some embodiments of the present application, the regenerative lime rotary kiln further comprises a lime cooling fan; the lime cooling fan is also connected with a lime cooling air inlet, a lime cooling air outlet is divided into two paths, one path is respectively connected with the combustion air inlets of the first kiln tail burner and the second kiln tail burner through a No. 2 three-way valve, and the other path is respectively connected with the combustion air inlets of the first kiln head burner and the second kiln head burner through a No. 1 three-way valve.
In some embodiments of the present application, the bottom of the first preheater is provided with a first material pushing rod for pushing the material, and the bottom of the second preheater is provided with a second material pushing rod for pushing the material; or the first preheater is provided with a first preheater transmission device, and the second preheater is provided with a second preheater transmission device; driving the first preheater to rotate and propel the material in the first preheater through the first preheater transmission, and driving the second preheater to rotate and propel the material in the second preheater through the second preheater transmission; the rotating speed of the first preheater is the same as or different from that of the first rotary kiln; the rotational speed of the second preheater may be the same as or different from the rotational speed of the second rotary kiln.
In some embodiments of the present application, the first kiln end burner, the second kiln end burner, the first kiln head burner and the second kiln head burner are burners using gas fuel, solid fuel or liquid fuel, or burners combining two or three of the above fuels.
In some embodiments of the present application, the first kiln end burners and the second kiln head burners are organized as one group of burners, and the second kiln end burners and the first kiln head burners are organized as another group of burners; the two groups of burners are switched at certain time intervals and alternately combusted.
The embodiment of the application provides a heat accumulation formula lime rotary kiln sets up first preheater and second preheater through the kiln tail end at first rotary kiln and second rotary kiln respectively, has realized the heat of the direct high temperature flue gas that produces of calcination in-process to the rotary kiln and has recycled, can utilize the direct high temperature flue gas that produces of calcination in-process of rotary kiln to directly preheat the material in first preheater and the second preheater. The heat accumulating type lime rotary kiln provided by the embodiment of the application does not need to be provided with an additional waste heat recovery device outside the kiln body, only utilizes the space at the kiln tail in the kiln body to arrange the first preheater and the second preheater, does not increase the occupied area of the lime rotary kiln, and solves the problems that the cost of the existing lime rotary kiln is higher and the occupied area is larger in the waste heat utilization process.
The heat accumulating type lime rotary kiln provided by the embodiment of the application adopts two kiln bodies, utilizes a heat accumulating technology, fully utilizes the waste heat of flue gas, and ensures that the temperature of waste gas can reach within 150 ℃, thereby improving the heat efficiency, reducing the production cost and fully utilizing resources; the kiln body is cooled, so that the service life of the cylinder body is prolonged, and the heat efficiency is improved by utilizing the heat dissipation loss of the cylinder body; the two kiln bodies, the kiln head and the kiln tail burner are mutually matched, so that the content of nitrogen oxide can be reduced, and the yield is improved. The two rotary kilns are arranged side by side, so that the occupied area is small, and the length can be short or long. When the temperature of the waste gas discharged by the two rotary kilns is lower than 150 ℃, the vertical preheaters can be selected or not according to requirements, and the height of the vertical preheaters can be adjusted according to requirements when the vertical preheaters are selected and matched.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural view of a regenerative lime rotary kiln provided in an embodiment of the present application;
fig. 2 is a schematic structural view of a first rotary kiln in a regenerative lime rotary kiln provided by an embodiment of the present application;
fig. 3 is another schematic structural diagram of a first rotary kiln in a regenerative lime rotary kiln provided by an embodiment of the present application;
fig. 4 is a schematic structural view of a heat collecting hood in a heat accumulating type lime rotary kiln provided by an embodiment of the application;
fig. 5 is a schematic structural view of a first gas seal chamber in a regenerative lime rotary kiln provided by an embodiment of the present application;
FIG. 6 is a schematic view of a hill pile;
figure 7 is a schematic of a flat material stack.
Wherein: 1 a-first rotary kiln, 1 b-second rotary kiln, 2-waste gas discharge system, 3-limestone bin, 4-spiral cooler, 5-kiln body cooling fan, 6-lime cooling fan, 7-heat collecting cover, 8 a-first kiln tail burner, 8 b-second kiln tail burner, 9 a-first kiln head burner, 9 b-second kiln head burner, 10-1 three-way valve, 11-2 three-way valve, 12-3 three-way valve, 13 a-first material push rod, 14 a-first preheater, 14 b-second preheater, 15-material outlet, 16 a-first kiln head cover, 16 b-second kiln head cover, 17-lime cooling air inlet, 18-lime cooling air outlet, 19 a-first kiln tail cover, 19 b-second kiln tail cover, 20 a-first limestone inlet, 20 b-second limestone inlet, 21 a-first smoke outlet, 21 b-second smoke outlet, 22-gas inlet, 23-gas outlet, 24-vertical preheater, 25-waste gas inlet, 26-waste gas outlet, 27-material inlet, 28 a-first preheater transmission device, 29 a-first rotary kiln transmission device, 29 b-second rotary kiln transmission device, 30-communicating pipeline, 31 a-first air distribution plate, 31 b-second air distribution plate, 31 c-third air distribution plate, 32 a-first air seal chamber, 32 b-second air seal chamber, 33 a-first rotary kiln feed inlet, 33 b-second rotary kiln feed inlet, 34 a-first air seal chamber air inlet, 34 b-second air seal chamber air inlet and 35-pressurizing fan.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
In order to explain the technical solution described in the present application, the following description will be given by way of specific examples.
An embodiment of the present application provides a heat accumulating type lime rotary kiln, as shown in fig. 1 and 2, including:
the kiln comprises a first rotary kiln 1a, a second rotary kiln 1b, a vertical preheater 24, a first preheater 14a, a second preheater 14b, a heat collection cover 7, a first kiln tail burner 8a, a second kiln tail burner 8b, a first kiln head burner 9a, a second kiln head burner 9b, a kiln body cooling fan 5, a lime cooling fan 6, a limestone bin 3, an exhaust gas discharge system 2 and a spiral cooler 4.
The first rotary kiln 1a is provided with a first rotary kiln transmission device 29a for driving the first rotary kiln 1a to rotate, and the second rotary kiln 1b is provided with a second rotary kiln transmission device 29b for driving the second rotary kiln 1b to rotate.
One end of the first rotary kiln 1a is provided with a kiln head and a first kiln head cover 16a, one end of the second rotary kiln 1b is provided with a kiln head and a second kiln head cover 16b, the first kiln head cover 16a is provided with a first kiln head burner 9a, and the second kiln head cover 16b is provided with a second kiln head burner 9 b. The installation directions and angles of the first kiln head burner 9a and the second kiln head burner 9b can be adjusted at will according to actual needs. The first kiln head cover 16a and the second kiln head cover 16b are connected through a communication pipeline 30.
The other ends (i.e., kiln ends) of the first rotary kiln 1a and the second rotary kiln 1b are connected to a first preheater 14a and a second preheater 14b, respectively. The first preheater 14a and the second preheater 14b are respectively disposed between the corresponding rotary kiln and the kiln tail cover thereof. Specifically, the first preheater 14a is arranged between the first rotary kiln 1a and the first kiln tail cover 19a, the second preheater 14b is arranged between the second rotary kiln 1b and the second kiln tail cover 19b, the cylinder diameter of the first preheater 14a is smaller than that of the first rotary kiln 1a, and the cylinder diameter of the second preheater 14b is smaller than that of the second rotary kiln 1 b. Corresponding kiln tail burners are respectively arranged on the first kiln tail cover 19a and the second kiln tail cover 19b, specifically, a first kiln tail burner 8a is arranged on the first kiln tail cover 19a, and a second kiln tail burner 8b is arranged on the second kiln tail cover 19 b. The installation directions and angles of the first kiln tail burner 8a and the second kiln tail burner 8b can be adjusted at will according to actual needs.
A screw cooler 4 is arranged between the first rotary kiln 1a and the second rotary kiln 1 b. The spiral cooler 4 is connected with the first rotary kiln 1a and the second rotary kiln 1b through a first kiln head cover 16a and a second kiln head cover 16b respectively, the spiral cooler 4 is provided with a lime cooling air inlet 17 and a lime cooling air outlet 18, the lime cooling fan 6 is connected with the lime cooling air inlet 17, the lime cooling air outlet 18 is divided into two paths, one path is connected with combustion-supporting air inlets of a first kiln tail burner 8a and a second kiln tail burner 8b through a No. 2 three-way valve 11 respectively, and the other path is connected with combustion-supporting air inlets of a first kiln head burner 9a and a second kiln head burner 9b through a No. 1 three-way valve 10 respectively.
In practical applications, besides the spiral cooler, other cooling and discharging devices may be used, such as a vertical cooler, through which lime output from the first rotary kiln 1a and the second rotary kiln 1b is cooled and finally output.
The kiln tail of the first rotary kiln 1a is connected with a material outlet of the limestone bin 3 through a first limestone inlet 20a, and the kiln tail of the second rotary kiln 1b is also connected with a material outlet of the limestone bin 3 through a second limestone inlet 20 b. The material inlet 27 of the vertical preheater 24 is connected to the limestone silo 3. The first kiln tail hood 19a on the first rotary kiln 1a is connected with the waste gas inlet 25 of the vertical preheater 24 through a first flue gas outlet 21a and a No. 3 three-way valve 12, and the second kiln tail hood 19b on the second rotary kiln 1b is also connected with the waste gas inlet 25 of the vertical preheater 24 through a second flue gas outlet 21b and a No. 3 three-way valve 12. The exhaust gas outlet of the vertical preheater 24 is connected to the exhaust gas discharge system 2.
In practical application, when the temperature of the flue gas discharged from the first flue gas outlet 21a arranged on the first kiln tail cover 19a or the second flue gas outlet 21b arranged on the second kiln tail cover 19b is less than 150 ℃, the vertical preheater 24 in the heat accumulating type lime rotary kiln can be cancelled, or the vertical preheater 24 with shorter length can be selected. In addition, a shaft kiln may be used instead of the shaft preheater 24.
In order to realize the propulsion of the material in the first and second preheaters 14a and 14b, a first material pushing rod 13a and a second material pushing rod may be provided at the bottom of the first and second preheaters 14a and 14b, respectively, as shown in fig. 2. In addition, in practical application, as an alternative to the first material pushing rod 13a or the second material pushing rod, a first preheater 14a and a second preheater 14b having a rotary propelling function may be used, and the first preheater 14a and the second preheater 14b rotate synchronously or asynchronously with the rotary kiln to propel the material.
Specifically, a first preheater transmission 28a and a second preheater transmission may be respectively disposed on the first preheater 14a and the second preheater 14b, the first preheater transmission 28a drives the first preheater 14a to rotate and propel the material in the first preheater 14a, and the second preheater transmission drives the second preheater 14b to rotate and propel the material in the second preheater 14b, as shown in fig. 3. The rotational speed of the first preheater 14a may be the same as or different from the rotational speed of the first rotary kiln 1a, and the rotational speed of the second preheater 14b may be the same as or different from the rotational speed of the second rotary kiln 1 b. The discharging mode can be a push rod mode, a rotating mode, a push rod and rotation combined mode or any other discharging mode which can push materials into the rotary kiln from the preheater.
And heat collecting covers 7 are arranged outside the first rotary kiln 1a, the second rotary kiln 1b and the spiral cooler 4, the heat collecting covers 7 are provided with gas inlets 22 and gas outlets 23, the kiln body cooling fan 5 is connected with the heat collecting covers 7 through the gas inlets 22, and the gas outlets 23 are connected with the lime cooling air inlets 17. In practical application, a first air distribution plate 31a and a second air distribution plate 31b may be respectively disposed at two ends of the heat collection cover 7, and a third air distribution plate 31c for isolating the first rotary kiln 1a from the second rotary kiln 1b may be disposed in the heat collection cover 7, as shown in fig. 4. Through first air distribution plate 31a, second air distribution plate 31b and third air distribution plate 31c, two kiln barrels can be cooled simultaneously, one kiln barrel can also be cooled first, and another kiln barrel is cooled.
The heat-insulating layer can be arranged on the inner side, the outer side or the inner side and the outer side of the heat-collecting cover 7; the heat pipe, the preheater and the cooler can be provided with heat insulating layers at the inner side, the outer side or the inner side and the outer side.
As shown in fig. 5, a first air seal chamber 32a is provided at the junction between the first rotary kiln 1a and the first preheater 14a, and a second air seal chamber 32b is provided at the junction between the second rotary kiln 1b and the second preheater 14 b. A first air seal chamber air inlet 34a is formed in the first air seal chamber 32a, and a second air seal chamber air inlet 34b is formed in the second air seal chamber 32 b; the exhaust gas discharge system 2 is connected to the first and second air lock chamber inlets 34a and 34b, respectively, by a booster fan 35. The first and second gas seal chambers 32a and 32b are each sealed at high pressure from low temperature exhaust gas from the exhaust gas discharge system 2.
Further, a first rotary kiln charging port 33a may be provided in the first rotary kiln 1a, and a second rotary kiln charging port 33b may be provided in the second rotary kiln 1b, as shown in fig. 5. Part of cold materials from the limestone bin 3 directly enter a first preheater 14a and a second preheater 14 b; another portion enters the vertical preheater 24. The hot materials from the vertical preheater 24 enter the first rotary kiln 1a through the first rotary kiln feed opening 33a and enter the second rotary kiln 1b through the second rotary kiln feed opening 33 b.
The operation process of the heat accumulating type lime rotary kiln provided by the embodiment of the application is as follows:
the first step is as follows:
the limestone material enters the vertical preheater 24 through the limestone bin 3, partially through the material inlet 27, and partially through the first limestone inlet 20a provided in the first kiln tail cover 19a, so that the material entering the first preheater 14a is cold material, and the cold material forms a slope-shaped material surface at the kiln tail end where the first preheater 14a belongs. The material preheated by the exhaust gas in the vertical preheater 24 enters the first rotary kiln 1a through the material outlet 15 via the first rotary kiln inlet 33a, so that the material entering the first rotary kiln 1a is hot material, and the hot material forms a mountain-shaped material pile in the first rotary kiln 1a as shown in fig. 6. With the operation of the first rotary kiln 1a, the material evolves from a mountain shape to a more gentle pile as shown in fig. 7. The gentle material pile can not block the nozzle flame, is favorable to the calcination of lime stone. Meanwhile, the first kiln head burner 9a sprays gas to burn, and the second kiln tail burner 8b sprays gas to burn, so that the materials in the first preheater 14a and the rotary kiln are calcined.
The material pre-calcined by the first preheater 14a is pushed into the first rotary kiln 1a by the first material push rod 13a for further calcination. After being calcined in the first rotary kiln 1a, lime enters the spiral cooler 4 through the first kiln hood cover 16a, cooling air blown out by the lime cooling fan 6 is converged with kiln body cooling air from the heat collecting cover 7, then the lime in the spiral cooler 4 is cooled, and the cooled lime is discharged from the kiln through the discharging device. And the flue gas from the second rotary kiln 1b is merged with the high-temperature flue gas combusted by the first kiln head burner 9a, and then enters the first rotary kiln 1a to continuously calcine the materials.
The high-temperature flue gas from the first rotary kiln 1a enters a first preheater 14a, the high-temperature flue gas is preheated by a slope-shaped material surface in the first preheater 14a and then converted into low-temperature flue gas, the low-temperature flue gas is discharged from a first flue gas outlet 21a arranged at the lower part of the first rotary kiln 1a, enters a vertical preheater 24 through a waste gas inlet 25 through a No. 3 three-way valve 12, and the low-temperature waste gas after limestone preheating enters the waste gas discharge system 2 through a waste gas outlet 26. The kiln body cooling fan 5 blows cold air into the heat collecting cover 7, cools the kiln body, then converges the cooled air with cooling air blown by the lime cooling fan 6, and enters the spiral cooler 4 to be heated by lime, one part of the cooled air enters the second kiln tail burner 8b as combustion-supporting air through the No. 2 three-way valve 11 to participate in combustion, and the other part of the cooled air enters the first kiln head burner 9a as combustion-supporting air through the No. 1 three-way valve 10 to participate in combustion.
The second step is that:
due to the existence of the slope-shaped charge level, the temperature rising speed of the materials in the first preheater 14a is high, and when the temperature of the exhaust gas of the first flue gas outlet 21a exceeds 150 ℃, the materials pre-calcined by the first preheater 14a are quickly pushed into the first rotary kiln 1a by the first material push rod 13a for further calcination. And then, carrying out quick reversing operation.
The third step:
the limestone material enters the vertical preheater 24 through the limestone bin 3, partially through the material inlet 27, and partially through the second limestone inlet 20b provided in the second kiln tail cover 19b, so that the material entering the second preheater 14b is a cold material, and the cold material forms a slope-shaped material surface at the kiln tail end where the second preheater 14b belongs. The material preheated by the exhaust gas in the vertical preheater 24 enters the second rotary kiln 1b through the material outlet 15 via the second rotary kiln charging port 33b, so that the material entering the second rotary kiln 1b is a hot material, and the hot material forms a mountain peak material pile in the second rotary kiln 1 b. Along with the operation of the second rotary kiln 1b, the material is changed from a mountain peak shape to a relatively gentle material pile. Meanwhile, the second kiln head burner 9b sprays gas to burn, and the first kiln tail burner 8a sprays gas to burn, so that the materials in the second preheater 14b and the rotary kiln are calcined.
The material pre-calcined by the second preheater 14b is pushed into the second rotary kiln 1b by a second material push rod for further calcination. After the lime is calcined in the second rotary kiln 1b, the lime enters the spiral cooler 4 through the second kiln hood cover 16b, cooling air blown out by the lime cooling fan 6 is converged with kiln body cooling air from the heat collecting cover 7, then the lime in the spiral cooler 4 is cooled, and the cooled lime is discharged from the kiln through the discharging device. The flue gas from the first rotary kiln 1a is merged with the high-temperature flue gas combusted by the second kiln head burner 9b, and then enters the second rotary kiln 1b to continuously calcine the materials.
The high temperature flue gas that the second rotary kiln 1b came out gets into second preheater 14b, and this high temperature flue gas preheats the material through slope shape material face in second preheater 14b, converts into low temperature flue gas, and the low temperature flue gas is discharged through establishing the second flue gas outlet 21b in second rotary kiln 1b lower part, gets into vertical preheater 24 through waste gas entry 25 through 3a three-way valve 12, and the low temperature waste gas behind the preheated limestone gets into exhaust emission system 2 through waste gas exit 26. The kiln body cooling fan 5 blows cold air into the heat collecting cover 7, cools the kiln body, then converges the cooled air with cooling air blown by the lime cooling fan 6, and enters the spiral cooler 4 to be heated by lime, one part of the cooled air enters the first kiln tail burner 8a through the No. 2 three-way valve 11 as combustion-supporting air to participate in combustion, and the other part of the cooled air enters the second kiln head burner 9b through the No. 1 three-way valve 10 as combustion-supporting air to participate in combustion.
The fourth step:
due to the existence of the slope-shaped material surface, the temperature rising speed of the material in the second preheater 14b is high, and when the temperature of the exhaust gas of the second flue gas outlet 21b exceeds 150 ℃, the material pre-calcined by the second preheater 14b is quickly pushed into the second rotary kiln 1b by the second material push rod for further calcination. And then, carrying out quick reversing operation.
The fifth step:
and repeating the operations of the first step, the second step, the third step and the fourth step. The operation is circulated in such a way.
A part of the low-temperature flue gas discharged by the waste gas discharge system 2 after being pressurized by the pressurizing fan 35 enters the first air seal chamber 32a through the first air seal chamber air inlet 34a for air seal; another portion enters the second air lock chamber 32b through the second air lock chamber inlet 34b for air lock. In practical application, a gas seal device can be arranged at the kiln head of each rotary kiln. In addition, the kiln head, the kiln tail and the joints of all parts can be provided with air sealing devices. The gas source required by each gas sealing device can be from the low-temperature flue gas discharged by the waste gas discharge system 2. The burner is allowed to inject the flue gas to assist in discharging the flue gas. The internal pressure of the first rotary kiln 1a and the second rotary kiln 1b is slightly positive.
Through the reversing operation, the first rotary kiln 1a and the second rotary kiln 1b alternately carry out calcination or preheating, and the reversing operation is realized through the actions of the No. 1 three-way valve 10, the No. 2 three-way valve 11 and the No. 3 three-way valve 12. The time interval of the reversing is 1 minute, the specific time interval is determined according to the process requirements, for example, in practical application, the time interval of the reversing can be set to be 10-15 minutes according to requirements.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A heat accumulating type lime rotary kiln is characterized by comprising: the rotary kiln comprises a first rotary kiln (1 a), a second rotary kiln (1 b), a first rotary kiln transmission device (29 a) arranged on the first rotary kiln (1 a) and a second rotary kiln transmission device (29 b) arranged on the second rotary kiln (1 b);
a first kiln tail cover (19 a) is arranged at the kiln tail end of the first rotary kiln (1 a), and a first kiln tail burner (8 a) is arranged on the first kiln tail cover (19 a); a second kiln tail cover (19 b) is arranged at the kiln tail end of the second rotary kiln (1 b), and a second kiln tail burner (8 b) is arranged on the second kiln tail cover (19 b);
a first preheater (14 a) is arranged between the first kiln tail cover (19 a) and the first rotary kiln (1 a); a second preheater (14 b) is arranged between the second kiln tail cover (19 b) and the second rotary kiln (1 b); the cylinder diameter of the first preheater (14 a) is smaller than that of the first rotary kiln (1 a), and the cylinder diameter of the second preheater (14 b) is smaller than that of the second rotary kiln (1 b);
a first kiln head cover (16 a) is arranged at the kiln head end of the first rotary kiln (1 a), a second kiln head cover (16 b) is arranged at the kiln head end of the second rotary kiln (1 b), and the first kiln head cover (16 a) is connected with the second kiln head cover (16 b) through a communicating pipeline (30); a first kiln head burner (9 a) is arranged on the first kiln head cover (16 a), and a second kiln head burner (9 b) is arranged on the second kiln head cover (16 b);
the first preheater (14 a) is used for forming a slope-shaped material surface at the kiln tail end of the first rotary kiln (1 a); the second preheater (14 b) is used for forming a slope-shaped material surface at the kiln tail end of the second rotary kiln (1 b);
materials with slope-shaped charge level formed in the first preheater (14 a) and materials entering the first rotary kiln (1 a) through a first rotary kiln charge door (33 a) on the first rotary kiln (1 a) cool flue gas together and are preheated by themselves;
the materials with slope-shaped material surfaces formed in the second preheater (14 b) and the materials entering the second rotary kiln (1 b) through a second rotary kiln feed inlet (33 b) on the second rotary kiln (1 b) cool the flue gas and are preheated by the flue gas.
2. The regenerative lime rotary kiln according to claim 1, further comprising a screw cooler (4); the spiral cooler (4) is arranged between the first rotary kiln (1 a) and the second rotary kiln (1 b), the spiral cooler (4) is connected with the first rotary kiln (1 a) through the first kiln head cover (16 a), and the spiral cooler (4) is connected with the second rotary kiln (1 b) through the second kiln head cover (16 b); the spiral cooler (4) is provided with a lime cooling air inlet (17) and a lime cooling air outlet (18).
3. The regenerative lime rotary kiln according to claim 2, further comprising a kiln body cooling fan (5) and a heat collecting cover (7) disposed outside the first rotary kiln (1 a), the second rotary kiln (1 b) and the spiral cooler (4); the heat collection cover (7) is provided with a gas inlet (22) and a gas outlet (23), the kiln body cooling fan (5) is connected with the heat collection cover (7) through the gas inlet (22), and the gas outlet (23) is connected with the lime cooling air inlet (17);
a first air distribution plate (31 a) and a second air distribution plate (31 b) are respectively arranged at two ends of the heat collection cover (7), and a third air distribution plate (31 c) used for isolating the first rotary kiln (1 a) from the second rotary kiln (1 b) is arranged in the heat collection cover (7);
the inner side, the outer side or the inner side and the outer side of the heat collection cover (7) are provided with heat preservation layers; and heat insulating layers are arranged on the inner sides, the outer sides or the inner and outer sides of the communication pipeline, the first preheater, the second preheater and the spiral cooler.
4. A regenerative lime rotary kiln according to claim 3, wherein the regenerative lime rotary kiln further comprises a vertical preheater (24) when the temperature of the flue gas discharged from the first flue gas outlet (21 a) provided in the first kiln tail cover (19 a) or the second flue gas outlet (21 b) provided in the second kiln tail cover (19 b) is 150 ℃ or higher; the vertical preheater (24) is provided with a waste gas inlet (25) and a waste gas outlet (26);
the first flue gas outlet (21 a) and the second flue gas outlet (21 b) are respectively connected with a waste gas inlet (25) of a vertical preheater (24) through a No. 3 three-way valve (12), and a waste gas outlet (26) of the vertical preheater (24) is connected with a waste gas discharge system (2);
the vertical preheater (24) is provided with a material inlet (27) and a material outlet (15); the heat accumulating type lime rotary kiln also comprises a limestone bin (3); the limestone bin (3) is connected with the vertical preheater (24) through the material inlet (27).
5. A regenerative lime rotary kiln according to claim 4, wherein a first air seal chamber (32 a) is provided at the junction between the first rotary kiln (1 a) and the first preheater (14 a); a second air seal chamber (32 b) is arranged at the joint between the second rotary kiln (1 b) and the second preheater (14 b); a first air sealing chamber air inlet (34 a) is formed in the first air sealing chamber (32 a), and a second air sealing chamber air inlet (34 b) is formed in the second air sealing chamber (32 b); the waste gas discharge system (2) is respectively connected with a first air seal chamber air inlet (34 a) and a second air seal chamber air inlet (34 b) through a booster fan (35); the first air seal chamber (32 a) and the second air seal chamber (32 b) are sealed at high pressure, and the used air sources are low-temperature waste gas from a waste gas discharge system (2);
the kiln head, the kiln tail and the joints of all parts are provided with air sealing devices; the gas source required by each gas seal device is from low-temperature flue gas discharged by the waste gas discharge system (2); the burner jets the flue gas to assist the discharge of the flue gas;
the first rotary kiln (1 a) is provided with a first rotary kiln charging hole (33 a), and the second rotary kiln (1 b) is provided with a second rotary kiln charging hole (33 b); one part of cold materials from the limestone bin (3) directly enter a first preheater (14 a) and a second preheater (14 b); the other part enters a vertical preheater (24); the hot materials from the vertical preheater (24) enter the first rotary kiln (1 a) through a first rotary kiln feed opening (33 a) and enter the second rotary kiln (1 b) through a second rotary kiln feed opening (33 b).
6. The regenerative lime rotary kiln according to claim 5, further comprising a lime cooling fan (6); lime cooling fan (6) also are connected with lime cooling air entry (17), lime cooling air export (18) divide into two the tunnel, and one way is through No. 2 three-way valve (11) respectively with the combustion air entry linkage of first kiln tail nozzle (8 a) with second kiln tail nozzle (8 b), and another way through No. 1 three-way valve (10) respectively with the combustion air entry linkage of first kiln head nozzle (9 a) with second kiln head nozzle (9 b).
7. The regenerative lime rotary kiln according to claim 6, wherein the first preheater (14 a) is provided at the bottom thereof with a first material pushing rod (13 a) for pushing the material, and the second preheater (14 b) is provided at the bottom thereof with a second material pushing rod for pushing the material;
or,
the first preheater (14 a) is provided with a first preheater transmission (28 a), the second preheater (14 b) is provided with a second preheater transmission; rotating the first preheater (14 a) and propelling material within the first preheater (14 a) via the first preheater transmission (28 a), and rotating the second preheater (14 b) and propelling material within the second preheater (14 b) via the second preheater transmission; the rotational speed of the first preheater (14 a) is the same as or different from the rotational speed of the first rotary kiln (1 a); the rotational speed of the second preheater (14 b) is the same as or different from the rotational speed of the second rotary kiln (1 b).
8. The regenerative lime rotary kiln according to claim 7, wherein the first kiln end burner (8 a), the second kiln end burner (8 b), the first kiln head burner (9 a) and the second kiln head burner (9 b) are burners using gas fuel, solid fuel or liquid fuel, or burners combining two or three of the above fuels.
9. The regenerative lime rotary kiln according to claim 8, wherein the first kiln end burners (8 a) and the second kiln head burners (9 b) are organized as one group of burners, and the second kiln end burners (8 b) and the first kiln head burners (9 a) are organized as another group of burners; the two groups of burners are switched at certain time intervals and alternately combusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910979632.XA CN110590192B (en) | 2019-10-15 | 2019-10-15 | Heat accumulating type lime rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910979632.XA CN110590192B (en) | 2019-10-15 | 2019-10-15 | Heat accumulating type lime rotary kiln |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110590192A CN110590192A (en) | 2019-12-20 |
| CN110590192B true CN110590192B (en) | 2022-04-19 |
Family
ID=68867372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910979632.XA Active CN110590192B (en) | 2019-10-15 | 2019-10-15 | Heat accumulating type lime rotary kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110590192B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201297860Y (en) * | 2007-12-03 | 2009-08-26 | 天津水泥工业设计研究院有限公司 | Device for calcining cement by utilizing acetylene sludge to completely substitute the limestone |
| CN104876456A (en) * | 2015-05-16 | 2015-09-02 | 江苏中圣园科技股份有限公司 | Rotary kiln lime roasting process |
| CN105236772A (en) * | 2015-10-23 | 2016-01-13 | 石家庄新华能源环保科技股份有限公司 | Shaft kiln-partition rotary kiln combination unit |
| CN105330178A (en) * | 2015-11-10 | 2016-02-17 | 中信重工机械股份有限公司 | Method for production of active lime by means of reform of cement production line |
| CN105698524A (en) * | 2016-02-17 | 2016-06-22 | 石家庄新华能源环保科技股份有限公司 | Regenerative multistage heating rotary kiln device |
-
2019
- 2019-10-15 CN CN201910979632.XA patent/CN110590192B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201297860Y (en) * | 2007-12-03 | 2009-08-26 | 天津水泥工业设计研究院有限公司 | Device for calcining cement by utilizing acetylene sludge to completely substitute the limestone |
| CN104876456A (en) * | 2015-05-16 | 2015-09-02 | 江苏中圣园科技股份有限公司 | Rotary kiln lime roasting process |
| CN105236772A (en) * | 2015-10-23 | 2016-01-13 | 石家庄新华能源环保科技股份有限公司 | Shaft kiln-partition rotary kiln combination unit |
| CN105330178A (en) * | 2015-11-10 | 2016-02-17 | 中信重工机械股份有限公司 | Method for production of active lime by means of reform of cement production line |
| CN105698524A (en) * | 2016-02-17 | 2016-06-22 | 石家庄新华能源环保科技股份有限公司 | Regenerative multistage heating rotary kiln device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110590192A (en) | 2019-12-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10151531B2 (en) | Dividing-wall rotary kiln apparatus | |
| CN106892578B (en) | A kind of full recycling CO2Lime kiln device | |
| CN105352314B (en) | A kind of tunnel cave for being used to smelt | |
| WO2016150100A1 (en) | Heat-accumulating lime rotary kiln | |
| CN110642539A (en) | Double-chamber lime kiln | |
| CN102992661B (en) | Beam type heat storage lime kiln | |
| CN112094058A (en) | Double-chamber kiln reconstructed from shaft kiln | |
| CN104833203B (en) | A kind of heat accumulating type installation for calcining cement | |
| CN203007146U (en) | Beam type heat accumulation lime kiln | |
| CN102992660B (en) | Low-heat value fuel lime kiln | |
| CN110590192B (en) | Heat accumulating type lime rotary kiln | |
| CN111006500B (en) | Industrial shaft kiln for producing lime | |
| CN206538348U (en) | A kind of active lime stone rotary kiln burning system | |
| CN213739208U (en) | Double-chamber kiln reconstructed from shaft kiln | |
| CN203478938U (en) | Rotary kiln apparatus with energy recovery equipment | |
| CN103352128A (en) | Direct zinc-coal mixing cyclone burning type zinc oxide production system | |
| CN103335514A (en) | Rotary kiln device provided with energy recovery equipment | |
| CN201522188U (en) | Flame-isolated rotary kiln for calcining dolomite | |
| CN213179369U (en) | Double-cylinder rotary kiln for burning back tail gas | |
| CN104119003A (en) | Heat accumulating type dividing-wall heating industrial furnace | |
| CN204022685U (en) | The industrial furnace of heat accumulating type partition heating | |
| CN201397051Y (en) | High-temperature slag ball cooling machine used in kiln phosphoric acid production | |
| CN203373158U (en) | Heat accumulating type semi-coke rotary kiln | |
| CN201355185Y (en) | Energy-saving kiln | |
| CN114105499B (en) | Self-heat-storage double-hearth kiln |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |