CN109437608B - Double-path air built-in heat exchanger lime shaft kiln and calcining method thereof - Google Patents
Double-path air built-in heat exchanger lime shaft kiln and calcining method thereof Download PDFInfo
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- CN109437608B CN109437608B CN201811332745.2A CN201811332745A CN109437608B CN 109437608 B CN109437608 B CN 109437608B CN 201811332745 A CN201811332745 A CN 201811332745A CN 109437608 B CN109437608 B CN 109437608B
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2/00—Lime, magnesia or dolomite
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- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
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Abstract
The invention discloses a double-path wind built-in heat exchanger lime shaft kiln and a calcining method thereof, wherein the lime shaft kiln comprises a shaft kiln body (1), a bottom wind seat (4), an intermediate wind seat (2), a bottom wind fan (7), an intermediate wind fan (8), a cross hollow beam (9), a built-in heat exchanger (3), an ash discharger (5), a metering bin (6) and a storage bin (10), wherein the shaft kiln body (1) is divided into a feeding area (A), a preheating area (B), a calcining area (C) and a cooling area (D) from top to bottom; the middle of the upper part of the cross hollow beam (9) is provided with the middle wind inlet seat (2), and the lower part of the middle wind inlet seat is connected with the built-in heat exchanger (3); the bottom air seat (4) is arranged at the lower part of the cooling area (D) and is communicated with a bottom air fan (7) through a pipeline; the lower end of a vent pipe (31) in the built-in heat exchanger (3) is communicated with the middle wind exhaust fan (8) through a pipeline, and the upper end of the vent pipe is communicated with the middle wind exhaust seat (2).
Description
Technical Field
The invention belongs to the field of lime calcination, and particularly relates to a double-path air built-in heat exchanger lime shaft kiln and a calcination method thereof.
Background
A large amount of fine powder particles of 0-60 mm are generated in the limestone crushing and screening production, and the particles of 0-5 mm are called powder; the grain size is 5-15 mm; the limestone powder is called small blocks with the thickness of 15-30 mm and is called medium blocks with the thickness of 30-60 mm, at present, the fine limestone powder is partially used in the industries of cement, sand making, roadbed filling, building materials and the like, most of the limestone powder is used as solid waste to be accumulated in the field, and the environment pollution is caused, and particularly, the high-grade small blocks of limestone are used as waste materials or used for sand making and roadbed filling, so that the large and small materials are caused, and the waste of resources is also caused.
Some enterprises try to fire small and medium limestone through a common shaft kiln for the metallurgy and chemical industry, because the small particle kiln has large internal resistance and bad ventilation in the middle during calcination, the materials are over-burnt at the edge of the kiln and under-burnt at the center of the kiln, the edge is oxidizing atmosphere and reducing atmosphere in the kiln, and in severe cases, because of the oxygen deficiency in the center of the kiln, the fuels are not completely combusted, and the materials are re-combusted when the oxygen condition at a discharge port becomes good, thereby causing the difficulty in operating the kiln and bringing high heat consumption, poor operating environment, low yield and incapability of meeting the use requirements of the product quality. The small and medium-sized limestone is fired by a common shaft kiln, the single-kiln productivity is not high and is mostly below 100t/d, and because the internal resistance of the small and medium-sized limestone is large, only high-pressure blast can be adopted, the installed power is high, and the power consumption is also large.
Some people try to solve the problems by adding the 'waist wind', but the 'waist wind' is still side wind, is difficult to enter the middle part of the kiln in a high-temperature zone, and has poor effect.
Disclosure of Invention
The purpose of the invention is as follows: the kiln overcomes the defects of insufficient calcining performance of a common shaft kiln, provides a double-path wind built-in heat exchange lime shaft kiln and a calcining method thereof, improves the ventilation environment in the shaft kiln, and overcomes the defects of insufficient ventilation and anoxic calcining of small and medium-sized limestone in the kiln.
The technical scheme is as follows: the invention adopts the following technical scheme:
a double-path wind built-in heat exchanger lime shaft kiln comprises a shaft kiln body, a bottom wind seat, an intermediate wind seat, a bottom wind fan, an intermediate wind fan, a cross hollow beam, a built-in heat exchanger, an ash discharging machine, a metering bin and a storage bin, wherein the shaft kiln body is divided into a feeding area, a preheating area, a calcining area and a cooling area from top to bottom; the bottom air seat is arranged at the lower part of the cooling area and is communicated with a bottom air fan arranged outside the shaft kiln body through a pipeline; the lower end of a vent pipe in the built-in heat exchanger is communicated with a medium wind fan arranged outside the shaft kiln body through a pipeline, and the upper end of the vent pipe is communicated with a medium wind seat arranged above the cross hollow beam; the ash discharging machine, the metering bin and the storage bin are sequentially arranged below the shaft kiln body.
The feeding area comprises a distributing machine and a flue gas outlet, and limestone raw materials and anthracite fuel enter the shaft kiln body from the distributing machine; CO produced after lime calcination2Hot gases and hot flue gases are discharged from the flue gas outlet.
The height-diameter ratio of the shaft kiln body is 4.5-6.5, and the height of the middle wind seat from the bottom surface of the shaft kiln body is 1/3-1/4 of the overall height of the shaft kiln body.
The shaft kiln is characterized in that a gas circuit pressure detecting instrument is further arranged at the position of the cross hollow beam on the shaft kiln body, the real-time wind pressure in the wind pressure and the middle wind seat where the bottom wind arrives is detected, the detected pressure data is fed back to a central control machine electrically connected with the central control machine, and the central control machine adjusts the pressure of the bottom wind fan and the pressure of the middle wind fan according to the operation requirements of the kiln.
And the bottom air fan and the middle air fan are both high-pressure air-leaving fans, and the selection types of the bottom air fan and the middle air fan are determined after resistance calculation and altitude correction.
And the total air volume of the bottom air fan and the middle air fan is calculated according to a fuel combustion formula.
And a metering bin is arranged at the lower part of the lime discharging machine and is used for weighing the finished lime.
Preferably, the real-time wind pressure at the outlet of the middle wind seat is 100-300 Pa higher than the absolute value of the wind pressure at the same height position of the cross hollow beam from the bottom wind.
Preferably, the bottom air blower and the middle air blower are roots blowers preferentially.
Preferably, the air volume of the medium wind blower accounts for 30-40% of the total air volume.
Preferably, the bottom air seat is made of Q235; the material of the built-in heat exchanger and the middle air seat is 310S.
Preferably, after heat exchange is carried out by the built-in heat exchanger, the outlet air temperature of the middle air outlet seat is more than or equal to 550 ℃.
The working principle of the equipment is as follows: the invention changes one path of air supply at the bottom of the common shaft kiln body into two paths of air supply, wherein, an outlet wind path of a bottom wind seat is responsible for the ventilation of the edge part of the kiln and is called as bottom wind; the other path is an outlet air path of the wind-stroke air seat, the air in the wind-stroke air seat is heated by a built-in heat exchanger and then is sent into the calcining zone, also called wind stroke, so that the problem of oxygen deficiency in the middle of the kiln is solved, and simultaneously the waste heat of the cooling zone is recovered.
The invention also discloses a calcining method of the lime shaft kiln with the double-path wind built-in heat exchanger, which comprises the following steps:
1. raw material and fuel preparation and feeding:
weighing and uniformly mixing small limestone blocks of 15-30 mm and smokeless coal particles of 5-10 mm, or middle limestone blocks of 30-60 mm and smokeless coal particles of 10-20 mm, conveying the mixture to a kiln top material distributor by adopting lifting and conveying equipment, and rotationally distributing the mixture into a vertical kiln body;
2. blowing by a fan, opening the kiln and igniting; the bottom air fan and the middle air fan supply air to the bottom air seat, the built-in heat exchanger and the middle air fan seat respectively through pipelines, the central control machine adjusts the pressure according to pressure data transmitted by the air circuit pressure detection instrument, so that the absolute value of the real-time air pressure at the outlet of the middle air seat is 100-300 Pa higher than that of the air pressure at the same height position of the cross hollow beam when the bottom air reaches the cross hollow beam, the optimal value is reached, and the kiln is opened for ignition; at the moment, the open fire in the kiln is uniform, and the air velocity difference between the inner edge area and the middle area of the kiln is greatly reduced;
3. preheating and calcining: the raw material and fuel are combusted in the calcining zone to produce hot flue gas and CO2The hot gas moves upwards under the push of blast air pressure and the suction force of an external induced draft fan, and the heat in the flue gas exchanges heat with the raw material and the fuel, so that the raw material and the fuel in the preheating zone are preheated;
when the raw material is limestone small blocks, the preheating time is 11.5-12 h, and the calcining time is 3.5-5.5 h;
when the raw material is the middle lump material of limestone, the preheating time is 16-17 h, and the calcining time is 6.5-7 h;
the temperature of the preheating zone is 25-800 ℃, the temperature of the side part, the middle part and the side part of the calcining zone is 800-1200-800 ℃, and the average moving speed of the materials in the kiln is about 1 m/h.
4. Cooling and ash discharging: calcining to obtain a lime finished product carrying a large amount of heat, and enabling the lime finished product to fall into a cooling area, wherein cold air at an outlet of a bottom air seat directly cools a side area of the kiln, and a built-in heat exchanger in the middle of the lower part of the cooling area cools the middle part of the kiln; the air stroke in the vent pipe of the built-in heat exchanger is heated after obtaining heat and is sent to the lower part of the calcining area to help the fuel to be fully combusted; meanwhile, the built-in heat exchanger cools the lime finished product in the middle of the cooling area, so that the ash discharging temperature of the lime finished product reaches 50-70 ℃; the lime finished product is weighed by a lime discharging machine and a metering bin and then enters a storage bin.
The invention has the beneficial effects that: the invention is designed mainly aiming at the problems of calcining small blocks of 15-30 mm limestone and blocks of 30-60 mm limestone in the existing common lime shaft kiln, and has the following advantages:
(1) simple process, small occupied area and investment saving: compared with a rotary kiln production device for calcining small blocks, the process kiln is much simpler, the rotary kiln generally occupies more than 10000 square meters, and the investment is more than 1.6 million yuan, while the scheme of the invention occupies about 400 square meters, and the investment does not exceed 500 million yuan, which is 1/3 of the investment of the rotary kiln;
(2) the productivity is high: compared with the common shaft kiln, the yield is higher, the maximum yield of burning small particles in the common shaft kiln is about 100t/d, and the product quality fluctuation is unstable; the output of the shaft kiln can reach 200 t/d-400 t/d, and the burning efficiency is improved because the middle part of the shaft kiln is improved in oxygen deficiency, the volume of the kiln can be increased, the burning period can be accelerated.
(3) The product quality is improved: the raw and over-burning rate of small particles in common vertical kiln is up to 20%, this technique is less than 8%, because of the improvement of decomposition efficiency of limestone, CO in kiln gas2The concentration can reach 35 percent, which is used for capturing and recovering CO2Is more favorable;
(4) energy conservation and consumption reduction: the cooling effect of the technology is better than that of the traditional shaft kiln, the temperature of the cooled lime finished product of the traditional shaft kiln is generally 80-100 ℃, open fire is discharged from the kiln when the temperature is serious, and the temperature of the cooled lime finished product of the invention is generally 50-70 ℃; the invention ensures that the fuel is completely combusted, the waste heat in the middle of the cooling zone is fully utilized, and the heat consumption of a unit product is less than or equal to 950 multiplied by 4.18KJ/kg.
Drawings
Fig. 1 is a schematic structural diagram of the double-way air built-in heat exchange lime shaft kiln (a central control machine is not shown).
Description of reference numerals: 1. shaft kiln body, 2, well wind seat, 3, built-in heat exchanger, 31, breather pipe, 4, end wind seat, 5, ash hoist, 6, measurement storehouse, 10, storage storehouse, 7, end wind fan, 8, well wind fan, 9, cross hollow beam, 91, gas circuit pressure measuring instrument, A, feeding zone, A1, cloth machine, A2, exhanst gas outlet, B, preheating zone, C, calcination area, D, cooling zone.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a double-path air built-in heat exchanger lime shaft kiln of the invention.
A double-path wind built-in heat exchanger lime shaft kiln comprises a shaft kiln body 1, a bottom wind seat 4, an intermediate wind seat 2, a bottom wind fan 7, an intermediate wind fan 8, a cross hollow beam 9, a built-in heat exchanger 3, an ash discharging machine 5, a metering bin 6 and a storage bin 10, wherein the shaft kiln body 1 is divided into a feeding area A, a preheating area B, a calcining area C and a cooling area D from top to bottom, the cross hollow beam 9 is erected at the junction of the calcining area C and the cooling area D and plays a role of fixing and supporting, the intermediate part above the cross hollow beam is provided with the intermediate wind seat 2, and the lower part below the cross hollow beam is connected with the built-in heat exchanger 3; the bottom air seat 4 is arranged at the lower part (the lower opening of the kiln) of the cooling area D and is communicated with a bottom air fan 7 arranged outside the shaft kiln body 1 through a pipeline; the lower end of a vent pipe 31 in the built-in heat exchanger 3 is communicated with a medium wind fan 8 arranged outside the shaft kiln body 1 through a pipeline, and the upper end of the vent pipe is communicated with a medium wind seat 2 arranged above the cross hollow beam 9; the ash discharging machine 5, the metering bin 6 and the storage bin 10 are sequentially arranged below the shaft kiln body 1.
The feeding area A comprises a distributing machine A1 and a flue gas outlet A2, and limestone raw materials and anthracite fuel enter the shaft kiln body 1 from the distributing machine A1; CO produced after lime calcination2Hot gases and hot flue gases are discharged from the flue gas outlet a 2.
The height-diameter ratio of the shaft kiln body 1 is 4.5-6.5, and the height of the middle wind seat from the bottom surface of the shaft kiln body 1 is 1/3-1/4 of the whole height of the shaft kiln body.
The shaft kiln is characterized in that a gas circuit pressure detection instrument 91 is further arranged at the position of the cross hollow beam 9 on the shaft kiln body 1, the detection bottom air reaches the air pressure at the same height of the cross hollow beam 9 and the real-time air pressure at the outlet of the middle air seat 2, the detected pressure data is fed back to a central control machine electrically connected with the central control machine, and the central control machine regulates and controls the pressure of the bottom air fan 7 and the pressure of the middle air fan 8 according to the process requirements.
The bottom air fan 7 and the middle air fan 8 both adopt high-pressure air-leaving fans, and the selection type of the high-pressure air-leaving fans is determined after resistance calculation and altitude correction.
And the total air volume of the bottom air fan 7 and the middle air fan 8 is obtained by calculation according to a combustion formula of the fuel type.
And a metering bin 6 is arranged at the lower part of the ash discharging machine 5 and is used for weighing finished lime.
Preferably, the real-time wind pressure at the outlet of the middle wind seat 2 is 100-300 Pa higher than the absolute value of the wind pressure at the same height position of the cross hollow beam 9 from the bottom wind.
Preferably, the bottom air blower 7 and the middle air blower 8 are roots blowers preferentially.
Preferably, the air volume of the medium wind blower 8 accounts for 30-40% of the total air volume.
Preferably, the bottom wind seat 4 is made of Q235; the material of the built-in heat exchanger 3 and the medium wind air seat 2 is 310S.
Preferably, after heat exchange is carried out by the built-in heat exchanger 3, the air temperature at the outlet of the middle wind seat 2 is more than or equal to 550 ℃.
The working principle of the equipment is as follows: the invention changes one path of air supply at the bottom of the common shaft kiln body into two paths of air supply, wherein, an outlet wind path of a bottom wind seat 4 is responsible for the ventilation of the edge part of the kiln and is called as bottom wind; the other path is an outlet air path of the medium wind blower seat 2, the air in the medium wind blower seat 8 is heated by the built-in heat exchanger 3 and then is sent into the calcining area C, also called medium wind, the problem of oxygen deficiency in the middle of the kiln is solved, and simultaneously the waste heat of the cooling area D is recovered.
The invention also discloses a calcining method of the lime shaft kiln with the double-path wind built-in heat exchanger, which comprises the following steps:
1. raw material and fuel preparation and feeding: weighing and uniformly mixing small limestone blocks of 15-30 mm and smokeless coal particles of 5-10 mm, or middle limestone blocks of 30-60 mm and smokeless coal particles of 10-20 mm, conveying to a kiln top distributing machine A1 by adopting lifting and conveying equipment, and rotationally distributing into a shaft kiln body 1;
2. blowing by a fan, opening the kiln and igniting; the bottom air fan 7 and the middle air fan 8 respectively supply air to the bottom air seat 4, the built-in heat exchanger 3 and the middle air seat 2 through pipelines, and the central control machine adjusts the pressure according to pressure data transmitted by the air path pressure detection instrument 9, so that the absolute value of the real-time air pressure at the outlet of the middle air seat 2 is 100-300 Pa higher than that of the air pressure of bottom air reaching the cross beam 4, the optimal value is reached, and the kiln is opened for ignition; at the moment, the open fire in the kiln is uniform, and the air velocity difference between the inner edge area and the middle area of the kiln is greatly reduced;
3. preheating and calcining: the raw material and fuel are combusted in the calcining zone C to produce hot flue gas and CO2The hot gas moves upwards under the push of blast air pressure and the suction force of an external draught fan, the heat in the flue gas exchanges heat with the raw materials and the fuel, and the raw materials and the fuel entering the upper preheating zone B are preheated;
when the raw material is limestone small blocks, the preheating time is 11.5-12 h, and the calcining time is 3.5-5.5 h;
when the raw material is the middle lump material of limestone, the preheating time is 16-17 h, and the calcining time is 6.5-7 h;
the temperature of the preheating zone B is 25-800 ℃, the temperature of the side part-middle part-side part of the calcining zone C is 800-1200-800 ℃, and the average moving speed of the materials in the kiln is about 1 m/h.
4. Cooling and ash discharging: calcining to obtain a lime finished product carrying a large amount of heat, and falling into a cooling area D, wherein cold air at an outlet of a bottom air seat 4 directly cools a kiln edge area, and a built-in heat exchanger 3 in the middle of the lower part of the cooling area D cools the middle part of the kiln; the wind in the vent pipe 31 of the built-in heat exchanger 3 is heated when obtaining heat and is sent to the lower part of the calcining area C to help the fuel to be fully combusted; meanwhile, the built-in heat exchanger 3 cools the lime finished product in the middle of the cooling area D, so that the ash discharging temperature of the lime finished product reaches 50-70 ℃; the lime finished product is measured and weighed by the lime discharging machine 5 and the measuring bin 6 and then enters the storage bin 10.
The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be noted that the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and it will be apparent to those skilled in the art that several modifications and improvements can be made without departing from the structure of the present invention, and these modifications should be construed as the scope of the present invention, which will not affect the effect of the present invention and the applicability of the patent.
Claims (9)
1. A double-path wind built-in heat exchanger lime shaft kiln is characterized by comprising a shaft kiln body (1), a bottom wind seat (4), an intermediate wind seat (2), a bottom wind fan (7), an intermediate wind fan (8), a cross hollow beam (9), a built-in heat exchanger (3), a lime discharger (5), a metering bin (6) and a storage bin (10), wherein the shaft kiln body (1) is divided into a feeding area (A), a preheating area (B), a calcining area (C) and a cooling area (D) from top to bottom, the cross hollow beam (9) is erected at the junction of the calcining area (C) and the cooling area (D), the intermediate part above the cross hollow beam is provided with the intermediate wind seat (2), and the lower part below the cross hollow beam is connected with the built-in heat exchanger (3); the bottom air seat (4) is arranged at the lower part of the cooling area (D) and is communicated with a bottom air fan (7) arranged outside the shaft kiln body (1) through a pipeline; the lower end of a vent pipe (31) in the built-in heat exchanger (3) is communicated with a medium wind fan (8) arranged outside the shaft kiln body (1) through a pipeline, and the upper end of the vent pipe is communicated with a medium wind seat (2) arranged above the cross hollow beam (9); the ash discharging machine (5), the metering bin (6) and the storage bin (10) are sequentially arranged below the shaft kiln body (1);
the shaft kiln is characterized in that a gas circuit pressure detection instrument (91) is further arranged at the position of the cross hollow beam (9) on the shaft kiln body (1), bottom air is detected to reach the wind pressure at the same height of the cross hollow beam (9) and the real-time wind pressure at the outlet of the middle wind seat (2), the detected pressure data is fed back to a central control machine electrically connected with the central control machine, and the central control machine regulates and controls the pressure of the bottom air fan (7) and the pressure of the middle air fan (8) according to process requirements.
2. The double-air built-in heat exchanger lime shaft kiln of claim 1, characterized in that the feeding area (a) comprises a distributor (a1), a flue gas outlet (a2), limestone raw material and smokeless coal fuel enter the shaft kiln body (1) from a distributor (a 1); CO produced after lime calcination2Hot gases and hot flue gases are discharged from the flue gas outlet (a 2).
3. The lime shaft kiln with the built-in double air heat exchanger as claimed in claim 1, wherein the height-diameter ratio of the shaft kiln body (1) is 4.5-6.5, and the height of the middle air outlet seat from the bottom surface of the shaft kiln body (1) is 1/3-1/4 of the overall height of the shaft kiln body.
4. The lime shaft kiln with the double-path wind built-in heat exchanger as claimed in claim 1, wherein the bottom wind fan (7) and the middle wind fan (8) both use high pressure fans, and the selection type is determined according to resistance calculation and altitude correction; the total air volume of the bottom air fan (7) and the middle air fan (8) is calculated according to a combustion formula according to the fuel type, and the air volume of the middle air fan (8) accounts for 30-40% of the total air volume.
5. The lime shaft kiln with the built-in double-air heat exchanger as claimed in claim 1, wherein a metering bin (6) is arranged at the lower part of the lime discharger (5) and is used for weighing finished lime.
6. The lime shaft kiln with the double-path wind built-in heat exchanger as claimed in claim 1, wherein the real-time wind pressure at the outlet of the middle wind seat (2) is 100-300 Pa higher than the absolute value of the wind pressure at the same height position of the cross hollow beam (9) reached by the bottom wind; after heat exchange is carried out by the built-in heat exchanger (3), the wind temperature at the outlet of the wind-middle wind seat (2) is more than or equal to 550 ℃.
7. The lime shaft kiln with the double-path wind built-in heat exchanger as claimed in claim 4, wherein the bottom wind fan (7) and the middle wind fan (8) both adopt high-pressure wind-separating fans; the bottom wind seat (4) is made of Q235; the material of the built-in heat exchanger (3) and the medium wind air seat (2) is 310S.
8. The calcination method of the double-air built-in heat exchanger lime shaft kiln as claimed in claim 2, which is characterized by comprising the following steps:
1) raw material and fuel preparation and feeding: weighing and uniformly mixing small limestone blocks of 15-30 mm and smokeless coal particles of 5-10 mm, or middle limestone blocks of 30-60 mm and smokeless coal particles of 10-20 mm, conveying to a kiln top distributing machine (A1) by adopting lifting and conveying equipment, and rotationally distributing into a shaft kiln body (1);
2) blowing by a fan, opening the kiln and igniting; the bottom air fan (7) and the middle air fan (8) respectively supply air to the bottom air seat (4), the built-in heat exchanger (3) and the middle air seat (2) through pipelines, and the central control machine adjusts the pressure according to pressure data transmitted by the air circuit pressure detection instrument (91), so that the real-time air pressure at the outlet of the middle air seat (2) is 100-300 Pa higher than the absolute value of the air pressure at the same height position of the bottom air reaching the cross hollow beam (9), and the bottom air can be started to ignite after reaching the optimal value;
3) preheating and calcining: the raw material and fuel are combusted in a calcination zone (C) to produce hot flue gases and CO2The hot gas moves upwards under the push of blast air pressure and an external induced draft fan, the heat in the flue gas exchanges heat with the raw materials and the fuel, and the raw materials and the fuel entering the upper preheating zone (B) are preheated; the temperature of the preheating zone (B) is 25-800 ℃, and the temperature of the edge part, the middle part and the edge part of the calcining zone (C) is 800-1200-800 ℃;
4) cooling and ash discharging: calcining to obtain a lime finished product carrying a large amount of heat, and enabling the lime finished product to fall into a cooling area (D), wherein cold air at an outlet of a bottom air seat (4) directly cools a side area of the kiln, and a built-in heat exchanger (3) in the middle of the lower part of the cooling area (D) cools the middle part of the kiln; the wind stroke in the vent pipe (31) of the built-in heat exchanger (3) is heated after obtaining heat and is sent to the lower part of the calcining zone (C) to help the fuel to be fully combusted; meanwhile, the built-in heat exchanger (3) cools the lime finished product in the middle of the cooling area (D) to enable the ash discharging temperature of the lime finished product to reach 50-70 ℃; the lime finished product is measured and weighed by a lime discharging machine (5) and a measuring bin (6) and then enters a storage bin (10).
9. The calcining method of the lime shaft kiln with the double-air internal heat exchanger as claimed in claim 8, wherein in the step 3), when the raw material is small limestone blocks, the preheating time is 11.5-12 h, and the calcining time is 3.5-5.5 h; when the raw material is the middle lump limestone, the preheating time is 16-17 hours, and the calcining time is 6.5-7 hours.
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| CN110835238B (en) * | 2019-10-26 | 2024-06-21 | 石家庄奋进科技有限公司 | Volume weight type sealing ash discharging machine |
| CN112556401B (en) * | 2020-12-09 | 2024-03-22 | 余松涛 | Rotary shaft kiln |
| AU2022275001A1 (en) * | 2021-05-11 | 2023-11-02 | Tecforlime | Decarbonation process of carbonated materials in a multi-shaft vertical kiln |
| WO2022238387A1 (en) * | 2021-05-11 | 2022-11-17 | Tecforlime | Decarbonation process of carbonated materials in a multi-shaft vertical kiln |
| CN116199435B (en) * | 2023-05-04 | 2023-06-27 | 北京瑞尔非金属材料有限公司 | Calcining limestone and recovering CO 2 Is a method of (2) |
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| CN107673637A (en) * | 2017-12-01 | 2018-02-09 | 河南中蓝新材料科技有限公司 | The suspension roasting device and its production technology of a kind of powdery active lime |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3884621A (en) * | 1973-07-30 | 1975-05-20 | Round Rock Lime Company | Control of vertical heat treating vessels |
| UA81952C2 (en) * | 2003-06-03 | 2008-02-25 | Маерц-Офенбау Аг | Method for burning lumps of material, in particular limestone |
| CN103601376A (en) * | 2013-11-18 | 2014-02-26 | 中冶焦耐工程技术有限公司 | Sleeve type double-hearth shaft kiln |
| CN203782042U (en) * | 2014-03-27 | 2014-08-20 | 北京首钢鲁家山石灰石矿有限公司 | Mechanical mixing small-granularity lime shaft kiln |
| CN105036573A (en) * | 2015-06-05 | 2015-11-11 | 包头东盛科技有限公司 | Pulverized coal combustion process in annular lime kiln and application thereof |
| CN205740770U (en) * | 2016-05-19 | 2016-11-30 | 大冶市环宇钙业科技有限公司 | A kind of negative-pressure type lime shaft kiln |
| CN206447782U (en) * | 2017-02-13 | 2017-08-29 | 天津市恒利陶机械设备有限公司 | A kind of novel environment friendly kiln |
| CN206940739U (en) * | 2017-06-27 | 2018-01-30 | 浙江天石纳米科技股份有限公司 | Double air intake limekilns |
| CN107673637A (en) * | 2017-12-01 | 2018-02-09 | 河南中蓝新材料科技有限公司 | The suspension roasting device and its production technology of a kind of powdery active lime |
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| CN109437608A (en) | 2019-03-08 |
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