Active lime production system suitable for limestone raw materials with various strengths

Abstract

The utility model relates to an active lime production system suitable for limestone raw materials with various strengths. The system comprises an inner cavity type preheating bin, a discharging port of a supplied material belt conveyor is connected with a feeding port of the inner cavity type preheating bin, a discharging port of the inner cavity type preheating bin is connected with a first feeding port of a chain scraper conveyor, a discharging port of the first chain scraper conveyor is connected with a feeding port of a feeding hopper, and a discharging port of the feeding hopper is connected with a feeding port of a vibrating screen. Materials on the vibrating screen are fed into the sintering system through a chain scraper conveyor II; an air outlet of the sintering system is connected with an air inlet of the kiln tail dust collector and an air inlet of the cyclone dust collector, an air outlet of the cyclone dust collector is connected with an inlet of the high-temperature fan, an outlet of the high-temperature fan is connected with an air inlet of the inner cavity type preheating bin, and an air outlet of the inner cavity type preheating bin is connected with an air inlet of the kiln tail dust collector. According to the utility model, the limestone raw material easy to pulverize can be ensured to normally produce active lime, meanwhile, the low-quality limestone raw material is utilized to the maximum extent, and the production cost of an enterprise is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical industry, and specifically relates to an active lime production system suitable for limestone raw materials of various strengths. Background Art

[0002] Active lime is the basic raw material of the metallurgical industry. As a slag-making agent for steelmaking, it has the advantages of desulfurization, dephosphorization, shortening smelting time, improving the purity and yield of molten steel, reducing lime and fluorite consumption, and increasing the life of converter lining. In the existing process of calcining active lime in a rotary kiln, the quality and characteristics of the limestone raw material have a great influence on the entire calcination system. The raw material has high compressive strength and no obvious bursting phenomenon. It is not easy to pulverize during the calcination process, and the material in the preheater is not easy to be sintered. The resistance of the entire system is small, the ventilation in the rotary kiln is smooth, clear and bright, and the working condition is good. The coal powder is also easier to fully burn in the rotary kiln. At the same time, the secondary air has strong penetration in the vertical cooler and the cooling effect of the finished lime is good. However, in some production sites, due to the poor grade of the mined ore, low compressive strength, and severe bursting under low temperature conditions, the limestone raw material has a high pulverization rate during the calcination process and is easily compacted in the preheater, resulting in poor ventilation in the rotary kiln, difficulty in full combustion of coal powder, poor air permeability of the finished lime, and difficulty in cooling, which ultimately leads to poor operating conditions of the entire firing system. The quality and output of the finished lime are difficult to meet the design requirements, and it also brings great difficulties to production operations. Utility Model Content

[0003] In view of the shortcomings of the existing methods, the utility model provides an active lime production system suitable for limestone raw materials of various strengths, which can not only ensure the normal production of active lime from easily pulverized limestone raw materials, but also actively and effectively utilize low-quality limestone raw materials, thereby reducing the production cost of the enterprise. The system is suitable for the production of active lime from limestone raw materials of various strengths.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An active lime production system suitable for limestone raw materials of various strengths, comprising a material conveyor belt, an inner cavity preheating bin, a chain plate conveyor 1, a material loading hopper, a vibrating screen, a chain plate conveyor 2, a sintering system, a cyclone dust collector, a high-temperature fan, a kiln tail dust collector, an exhaust fan and a chimney;

[0006] The material outlet of the incoming material belt conveyor is connected to the material inlet of the inner cavity type preheating bin, the material outlet of the inner cavity type preheating bin is connected to the first material inlet of the chain plate conveyor, the first material outlet of the chain plate conveyor is connected to the material inlet of the upper hopper, the material outlet of the upper hopper is connected to the material inlet of the vibrating screen, the material outlet on the vibrating screen is connected to the second material inlet of the chain plate conveyor, and the second material outlet of the chain plate conveyor is connected to the sintering system;

[0007] The air outlet of the firing system is connected to the air inlet of the dust collector at the tail end of the kiln, and the air outlet of the firing system is also connected to the air inlet of the cyclone dust collector, the air outlet of the cyclone dust collector is connected to the inlet of the high-temperature fan, the outlet of the high-temperature fan is connected to the air inlet of the inner cavity type preheating bin, the air outlet of the inner cavity type preheating bin is connected to the air inlet of the dust collector at the tail end of the kiln, the air outlet of the dust collector at the tail end of the kiln is connected to the inlet of the exhaust fan, and the outlet of the exhaust fan is connected to the air inlet of the chimney.

[0008] Preferably, the outlet of the material under the vibrating screen is connected to the feed inlet of the gravel bin, and a car bulk system is arranged at the bottom of the gravel bin.

[0009] Preferably, a chain conveyor is arranged at the bottom of the cyclone dust collector, and the discharge port of the cyclone dust collector is connected to the feed port of the chain conveyor.

[0010] Preferably, the firing system includes a preheater and a rotary kiln, the air outlet of the preheater is connected to the air inlet of the dust collector at the end of the kiln through pipe one, the pipe one is connected to pipe two, the other end of pipe two is connected to the air inlet of the cyclone dust collector, the air outlet of the cyclone dust collector is connected to the inlet of the high-temperature fan through pipe three, the outlet of the high-temperature fan is connected to the air inlet of the inner cavity type preheating bin through pipe four, and the air outlet of the inner cavity type preheating bin is connected to pipe one through pipe five.

[0011] Preferably, electric butterfly valve 1 and electric butterfly valve 2 are respectively provided on pipeline 1 and pipeline 2, and electric butterfly valve 4 is provided on pipeline 5.

[0012] Preferably, a hot blast furnace is further included, the air outlet of the hot blast furnace is connected to the pipe four of the high-temperature blower outlet through the pipe six, and the electric butterfly valve three is arranged on the pipe six.

[0013] Preferably, the discharge port of the inner cavity type preheating bin is connected to the feed port of a vibrating feeder through a discharge pipe, and the discharge port of the vibrating feeder is connected to a feed port of a chain conveyor through a discharge pipe.

[0014] Preferably, the material outlet of the incoming belt conveyor is connected to the material inlet of the inner cavity type preheating bin through pipe seven, a pneumatic gate valve is arranged on the pipe seven, and the ash outlet of the inner cavity type preheating bin is connected to the material inlet of the chain conveyor through pipe eight, and a heavy hammer flap valve is arranged on the pipe eight.

[0015] Preferably, a spray device is provided above the chain conveyor and the vibrating screen.

[0016] The positive and beneficial effects of the utility model:

[0017] 1. When the limestone raw material is of good quality and high strength and does not require preheating, the high-temperature exhaust gas from the firing system directly enters the dust collector at the end of the kiln. After dust removal and purification by the dust collector at the end of the kiln, it is finally discharged into the atmosphere through the exhaust fan and chimney. When easily pulverized limestone raw materials are used, heat exchange is carried out between the easily pulverized limestone raw materials and the high-temperature flue gas from the lime burning system in the inner cavity preheating bin, the easily pulverized limestone raw materials are preheated to a certain temperature, and the temperature is kept constant for a certain period of time before subsequent calcination production is carried out. This can effectively reduce the limestone bursting and pulverization phenomena during the calcination process. Compared with the production conditions when no preheating and heat preservation treatment is carried out in the prior art, the limestone raw materials are preheated and heat preserved before subsequent high-temperature calcination production. The amount of fine powder in the rotary kiln is significantly reduced, and it is not easy to compact in the preheater, so that the ventilation in the rotary kiln is smooth, the coal powder is fully burned, the finished lime has good air permeability and good cooling effect, and the reduction in the amount of fine powder greatly improves the working environment of the burning system, so that the entire burning system can operate normally and produce stably, while also actively and effectively utilizing low-quality limestone raw materials, reducing the production cost of the enterprise, and the quality and output of the finished products are also greatly improved compared with before.

[0018] 2. The utility model system sets two production modes. Whether preheating is required is determined according to whether the limestone raw material is easy to pulverize, so as to select the corresponding production process. The switching can be carried out only by opening and closing the corresponding valves. The operation is simple. Compared with the existing production process, the utility model production process is more applicable to limestone raw materials.

[0019] 3. The utility model sets a spray device above the chain conveyor and the vibrating screen. The spray device is connected to the external water supply through a pipeline. The spray device atomizes the cooling water to cool the preheated raw materials. The raw materials are finally cooled to room temperature, which avoids the subsequent production equipment from running in a high temperature environment for a long time and affecting its service life. The subsequent production equipment is effectively protected, and the dust in the production process is also reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The schematic diagram of the structure of the active lime production system is applicable to limestone raw materials of various strengths;

[0021] In the figure: 1-incoming belt conveyor, 2-inner cavity preheating bin, 3-vibrating feeder, 4-chain conveyor 1, 5-upper hopper, 6-vibrating screen, 7-chain conveyor 2, 8-crushed stone bin, 9-automobile bulk system, 10-cyclone dust collector, 11-chain conveyor, 12-high temperature fan, 13-hot blast furnace, 14-kiln tail dust collector, 15-exhaust fan, 16-chimney, 17-electric butterfly valve 1, 18-electric butterfly valve 2, 19-electric butterfly valve 3, 20-electric butterfly valve 4, 21-pneumatic plug valve, 22-heavy hammer flap valve, 23-spray device, 24-firing system, 241-preheater, 242-rotary kiln, 25-pipeline 1, 26-pipeline 2, 27-pipeline 3, 28-pipeline 4, 29-pipeline 5, 30-pipeline 6. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with some specific embodiments.

[0023] See also Figure 1 , an active lime production system suitable for limestone raw materials of various strengths, including a material conveyor belt 1, an inner cavity preheating bin 2, a chain plate conveyor 4, a hopper 5, a vibrating screen 6, a chain plate conveyor 7, a sintering system 24, a cyclone dust collector 10, a high-temperature fan 12, a kiln tail dust collector 14, an exhaust fan 15 and a chimney 16;

[0024] The internal structure and working principle of the inner cavity type preheating bin are prior art, see the patent "A vertical heat exchange device for granular materials", patent number ZL201920815046.7 for details, including an outer shell and an inner shell, the outer shell and the inner shell are provided with air inlets and air outlets on their outer peripheries respectively, the outer shell is provided with a feed inlet at the top, a discharge outlet at the bottom, and an ash outlet at the bottom of the inner shell;

[0025] The discharge port of the incoming material belt conveyor 1 is connected to the feed port of the inner cavity type preheating bin 2, the discharge port of the inner cavity type preheating bin 2 is connected to the feed port of the chain plate conveyor 4 through a discharge pipe, the discharge port of the chain plate conveyor 4 is connected to the feed port of the upper hopper 5 through a discharge pipe, the discharge port of the upper hopper 5 is connected to the feed port of the vibrating screen 6 through a discharge pipe, the raw materials are screened and sorted in the vibrating screen 6, the screened materials suitable for the sintering system 24 enter the feed port of the chain plate conveyor 27 through the discharge pipe, and the discharge port of the chain plate conveyor 27 is connected to the sintering system 24 through the discharge pipe;

[0026] The air outlet of the firing system 24 is connected to the air inlet of the dust collector 14 at the end of the kiln, and the air outlet of the firing system 24 is also connected to the air inlet of the cyclone dust collector 10. The high-temperature flue gas undergoes preliminary dust removal and purification in the cyclone dust collector 10. The air outlet of the cyclone dust collector 10 is connected to the inlet of the high-temperature fan 12. The outlet of the high-temperature fan 12 is connected to the air inlet of the inner cavity type preheating bin 2. The air outlet of the inner cavity type preheating bin 2 is connected to the air inlet of the dust collector 14 at the end of the kiln. The air outlet of the dust collector 14 at the end of the kiln is connected to the inlet of the exhaust fan 15. The outlet of the exhaust fan 15 is connected to the air inlet of the chimney 16. The waste gas after preheating and insulation with the raw materials is finally discharged into the atmosphere through the chimney 16.

[0027] In this embodiment, when limestone raw materials that are easy to pulverize and have low strength and need to be preheated are used, the limestone raw materials are sent to the inner cavity type preheating bin 2 through the incoming material belt conveyor 1, and heat exchange is carried out with the high-temperature flue gas from the lime burning system in the inner cavity type preheating bin 2. After being preheated to a certain temperature and kept warm for a certain period of time, the material is sent to the vibrating screen 6 through the chain plate conveyor 1 4 and the upper hopper 5. The raw materials are screened and sorted in the vibrating screen 6, and the screened materials suitable for the burning system 24 are sent to the burning system 24 through the chain plate conveyor 2 7 for subsequent calcination production. The exhaust gas after heat exchange with the raw material is discharged from the outlet of the inner cavity type preheating bin 2, and is sent to the chimney 16 through the kiln tail dust collector 14 and the exhaust fan 15, and is finally discharged into the atmosphere from the chimney 16.

[0028] When the limestone raw material is of good quality and high strength and does not require preheating, the high-temperature exhaust gas from the sintering system 24 directly enters the kiln tail dust collector 14, and after dust removal and purification by the kiln tail dust collector, it is finally discharged into the atmosphere through the exhaust fan and chimney.

[0029] Furthermore, the outlet of the material under the vibrating screen 6 is connected to the feed port of the crushed stone bin 8, and a truck bulk system 9 is arranged at the bottom of the crushed stone bin 8. The crushed stones under the vibrating screen 6 fall into the crushed stone bin 8 and are unloaded and transported out by the truck bulk system 9 arranged at the bottom of the bin.

[0030] Furthermore, a chain conveyor 11 is provided at the bottom of the cyclone dust collector 10 , the discharge port of the cyclone dust collector 10 is connected to the feed port of the chain conveyor 11 , and the dust collected in the cyclone dust collector 10 is sent to the dust bin through the chain conveyor 11 .

[0031] Furthermore, the firing system includes a preheater 241 and a rotary kiln 242, the air outlet of the preheater 241 is connected to the air inlet of the kiln tail dust collector 14 through a pipe 1 25, the pipe 1 25 is connected to a pipe 2 26, the other end of the pipe 2 26 is connected to the air inlet of the cyclone dust collector 10, the air outlet of the cyclone dust collector 10 is connected to the inlet of the high-temperature fan 12 through a pipe 3 27, the outlet of the high-temperature fan 12 is connected to the air inlet of the inner cavity type preheating bin 2 through a pipe 4 28, and the air outlet of the inner cavity type preheating bin 2 is connected to the pipe 1 25 through a pipe 5 29.

[0032] Furthermore, electric butterfly valve one 17 and electric butterfly valve two 18 are respectively provided on pipeline one 25 and pipeline two 26, and electric butterfly valve four 20 is provided on pipeline five 29.

[0033] In this embodiment, two production processes are divided according to whether the raw materials need to be preheated. When the raw materials do not need to be preheated, the electric butterfly valve 17 is opened and the electric butterfly valve 2 18 is closed; when the raw materials need to be preheated, the electric butterfly valve 2 18 and the electric butterfly valve 4 20 are opened, and the electric butterfly valve 17 is closed. Two different production process requirements are achieved by switching the electric butterfly valve 17 and the electric butterfly valve 2 18.

[0034] Furthermore, it also includes a hot blast furnace 13, the air outlet of the hot blast furnace 13 is connected to the pipe four 28 of the outlet of the high-temperature fan 12 through the pipe six 30, and the electric butterfly valve three 19 is arranged on the pipe six 30.

[0035] In this embodiment, the hot blast furnace 13 is in a shut-down state under normal circumstances. When the raw materials need to be preheated and the temperature of the high-temperature flue gas from the kiln tail cannot meet the temperature required for preheating the raw materials, the hot blast furnace 13 can be started, and the hot air from the hot blast furnace is connected to the outlet duct 4 28 of the high-temperature fan 12 through the duct 6 30, and is mixed with the hot air from the high-temperature fan 12 to preheat the raw materials. In addition, when the hot blast furnace 13 is running, the air volume out of the hot blast furnace 13 can be adjusted by adjusting the opening of the electric butterfly valve 3 19, so as to adjust the hot air temperature in the outlet duct 4 28 of the high-temperature fan 12, and finally meet the preheating temperature required for the raw materials.

[0036] Furthermore, the discharge port of the inner cavity preheating bin 2 is connected to the feed port of the vibrating feeder 3 through a discharge pipe, four vibrating feeders 3 are provided, and the discharge port of the vibrating feeder 3 is connected to the feed port of the chain conveyor 4 through a discharge pipe.

[0037] Furthermore, the discharge port of the incoming belt conveyor 1 is connected to the feed port of the inner cavity type preheating bin 2 through pipe seven, a pneumatic gate valve 21 is arranged on pipe seven, and the ash discharge port of the inner cavity type preheating bin 2 is connected to the feed port of the chain conveyor 4 through pipe eight, a heavy hammer flap valve 22 is arranged on pipe eight.

[0038] In this embodiment, the pneumatic valve plug valve 21 is opened when the feeding belt conveyor 1 is feeding, and is closed when the feeding belt conveyor 1 stops feeding; the heavy hammer flap valve 22 ensures that the inner cavity type preheating bin 2 is always in a closed state before unloading, and no outside air leaks in. The raw materials unloaded from the ash outlet fall into the chain conveyor 4 and are sent into the feeding hopper 5 together with the raw materials falling from the outlet.

[0039] Furthermore, a spray device 23 is provided above the chain conveyor 4 and the vibrating screen 6.

[0040] In this embodiment, the spray device is connected to the external water supply through a pipeline. After the spray device atomizes the cooling water, it sprays it on the surface of the preheated raw materials to cool the preheated raw materials, which not only protects subsequent production equipment, but also reduces dust in the production process.

[0041] The utility model is applicable to a method for producing active lime from various limestone raw materials, and the system comprises the following steps:

[0042] 1) When the limestone raw material has good quality and high strength and does not need to be preheated, the electric butterfly valve 17 on the pipeline 1 25 is opened, the high-temperature fan 12 is turned off, and the electric butterfly valves 2 18 and 4 20 on the pipeline 2 26 and pipeline 5 29 are closed at the same time. The high-temperature exhaust gas from the burning system 24 directly enters the kiln tail dust collector 14 through the pipeline 1 25, and after dust removal and purification in the kiln tail dust collector 14, it is finally discharged into the atmosphere through the exhaust fan 15 and the chimney 16;

[0043] When limestone raw materials that are easy to pulverize are used, which have low strength and need to be preheated, the electric butterfly valve 17 on the pipeline 1 25 is closed, and the electric butterfly valve 2 18 on the pipeline 2 26 and the electric butterfly valve 4 20 on the pipeline 5 29 are opened at the same time, and the high-temperature fan 12 is turned on. The high-temperature exhaust gas from the sintering system passes through the cyclone dust collector 10 and the high-temperature fan 12 and enters the inner cavity type preheating bin 2 to preheat and keep the raw materials in the bin warm. The exhaust gas after heat exchange with the raw materials is discharged from the outlet of the inner cavity type preheating bin 2, and is sent to the chimney 16 through the kiln tail dust collector 14 and the exhaust fan 15, and is finally discharged into the atmosphere by the chimney 16. The dust collected in the cyclone dust collector 10 is sent to the powder ash bin through the zipper conveyor 11;

[0044] The raw materials enter the inner cavity preheating bin 2 through the incoming belt 1, are discharged through the vibrating feeder 3 at the bottom of the bin, and directly fall into the upper hopper 5 through the chain conveyor 1 4, and are then transported to the vibrating screen 6 through the upper hopper 5. After screening and sorting by the vibrating screen 6, the qualified block raw materials on the screen fall directly onto the chain conveyor 2 7, and are finally sent to the sintering system 24 for subsequent calcination reaction. The crushed stones under the screen fall into the crushed stone bin 8 and are unloaded and transported by the automobile bulk system 9 located at the bottom of the bin.

[0045] Furthermore, it also includes a hot blast furnace 13, the air outlet of the hot blast furnace 13 is connected to the pipe 28 of the high temperature fan 12 outlet through the pipe 6 30, and the electric butterfly valve 3 19 is arranged on the pipe 6 30. Under normal circumstances, the hot blast furnace 13 does not work, and the electric butterfly valve 3 19 on the air outlet pipe 6 30 is also in a closed state. When the raw material needs to be preheated and the temperature of the high temperature flue gas from the kiln tail cannot meet the needs, the hot blast furnace 13 can be started at this time, and the electric butterfly valve 3 19 on the hot blast furnace air outlet pipe 6 30 is opened at the same time, so that the flue gas coming out of the hot blast furnace 13 is mixed with the hot air in the pipe 6 30 and the pipe 4 28 through the pipe 6 30, and then enters the inner cavity type preheating bin 2 together after mixing to preheat the raw material.

[0046] Furthermore, the discharge port of the incoming conveyor belt 1 is connected to the feed port of the inner cavity type preheating bin 2 through a pipe 7, and a pneumatic gate valve 21 is arranged on the pipe 7. The ash discharge port of the inner cavity type preheating bin 2 is connected to the feed port of the chain plate conveyor 4 through a pipe 8, and a heavy hammer flap valve 22 is arranged on the pipe 8. The pneumatic gate valve 21 is opened when the feeding conveyor belt 1 is feeding, and is closed when the feeding conveyor belt 1 stops feeding; the heavy hammer flap valve 22 ensures that the inner cavity type preheating bin 2 is always in a closed state before the ash is discharged, and no outside air is leaked in. The raw materials discharged from the ash discharge port fall into the chain plate conveyor 4, and are sent to the feeding hopper 5 together with the raw materials dropped from the discharge port.

[0047] Furthermore, in order to effectively protect subsequent production equipment, a spray device 23 is also provided on the upper part of the chain conveyor 4 and the vibrating screen 6. The spray device is connected to the external water supply through a pipeline. When the chain conveyor 14 and the vibrating screen 6 are in operation, the spray device 23 is turned on. At this time, the atomized water droplets are evenly sprinkled on the material to cool it down. The material is finally cooled to room temperature, so that the subsequent production equipment will not be affected in its service life due to long-term operation in a high-temperature environment.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. An active lime production system suitable for limestone raw materials of various strengths, characterized in that: It includes a material conveyor belt (1), an inner cavity preheating chamber (2), a chain conveyor (4), a hopper (5), a vibrating screen (6), a chain conveyor (7), a firing system (24), a cyclone dust collector (10), a high-temperature fan (12), a kiln tail dust collector (14), an exhaust fan (15) and a chimney (16); The material outlet of the incoming material conveyor (1) is connected to the material inlet of the inner cavity type preheating bin (2), the material outlet of the inner cavity type preheating bin (2) is connected to the material inlet of the chain plate conveyor 1 (4), the material outlet of the chain plate conveyor 1 (4) is connected to the material inlet of the upper hopper (5), the material outlet of the upper hopper (5) is connected to the material inlet of the vibrating screen (6), the material outlet on the vibrating screen (6) is connected to the material inlet of the chain plate conveyor 2 (7), and the material outlet of the chain plate conveyor 2 (7) is connected to the sintering system (24); The air outlet of the firing system (24) is connected to the air inlet of the dust collector (14) at the end of the kiln, and the air outlet of the firing system (24) is also connected to the air inlet of the cyclone dust collector (10). The air outlet of the cyclone dust collector (10) is connected to the inlet of the high-temperature fan (12). The outlet of the high-temperature fan (12) is connected to the air inlet of the inner cavity type preheating bin (2). The air outlet of the inner cavity type preheating bin (2) is connected to the air inlet of the dust collector (14) at the end of the kiln, and the air outlet of the dust collector (14) at the end of the kiln is connected to the inlet of the exhaust fan (15). The outlet of the exhaust fan (15) is connected to the air inlet of the chimney (16).

2. The active lime production system applicable to limestone raw materials of various strengths according to claim 1 is characterized in that: The outlet of the material under the vibrating screen (6) is connected to the feed inlet of the crushed stone bin (8), and a car bulk system (9) is arranged at the bottom of the crushed stone bin (8).

3. The active lime production system applicable to limestone raw materials of various strengths according to claim 1 is characterized in that: A chain conveyor (11) is arranged at the bottom of the cyclone dust collector (10), and the discharge port of the cyclone dust collector (10) is connected to the feed port of the chain conveyor (11).

4. The active lime production system applicable to limestone raw materials of various strengths according to claim 1 is characterized in that: The sintering system comprises a preheater (241) and a rotary kiln (242); the air outlet of the preheater (241) is connected to the air inlet of the kiln tail dust collector (14) through a pipe 1 (25); the pipe 1 (25) is connected to a pipe 2 (26); the other end of the pipe 2 (26) is connected to the air inlet of a cyclone dust collector (10); the air outlet of the cyclone dust collector (10) is connected to the inlet of a high-temperature fan (12) through a pipe 3 (27); the outlet of the high-temperature fan (12) is connected to the air inlet of an inner cavity type preheating bin (2) through a pipe 4 (28); the air outlet of the inner cavity type preheating bin (2) is connected to the pipe 1 (25) through a pipe 5 (29).

5. The active lime production system applicable to limestone raw materials of various strengths according to claim 4 is characterized in that: The pipeline 1 (25) and the pipeline 2 (26) are respectively provided with an electric butterfly valve 1 (17) and an electric butterfly valve 2 (18), and the pipeline 5 (29) is provided with an electric butterfly valve 4 (20).

6. The active lime production system applicable to limestone raw materials of various strengths according to claim 5 is characterized in that: It also includes a hot air furnace (13), the air outlet of the hot air furnace (13) is connected to the pipe four (28) of the outlet of the high-temperature fan (12) through the pipe six (30), and the pipe six (30) is provided with an electric butterfly valve three (19).

7. The active lime production system applicable to limestone raw materials of various strengths according to claim 1 is characterized in that: The discharge port of the inner cavity type preheating bin (2) is connected to the feed port of a vibrating feeder (3) via a discharge pipe, and the discharge port of the vibrating feeder (3) is connected to the feed port of a chain conveyor (4) via a discharge pipe.

8. The active lime production system applicable to limestone raw materials of various strengths according to claim 1 is characterized in that: The material outlet of the incoming material conveyor (1) is connected to the material inlet of the inner cavity type preheating bin (2) via a pipe seven, and a pneumatic gate valve (21) is provided on the pipe seven. The ash outlet of the inner cavity type preheating bin (2) is connected to the material inlet of the chain conveyor 1 (4) via a pipe eight, and a heavy hammer flap valve (22) is provided on the pipe eight.

9. The active lime production system applicable to limestone raw materials of various strengths according to claim 1, characterized in that: A spray device (23) is provided above the chain conveyor (4) and the vibrating screen (6).

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