阅读说明：本技术 一种节能减排竖窑及基于其的石灰生产工艺 (Energy-saving emission-reducing shaft kiln and lime production process based on same ) 是由 齐浩宇 吴海亭 于 2021-09-28 设计创作，主要内容包括：本发明涉及冶金设备技术领域,提出了一种节能减排竖窑,包括窑体,具有进料口,设置在窑体的顶部；出料口,设置在窑体的底部；进气口；及排气口,排气口与进气口连通；分隔板,移动设置在窑体内,沿进料口到出料口依次排列设置有若干个,若干个分隔板将窑体内部空腔分为预热区、一级煅烧区、二级煅烧区及冷却区；钢丝绳,一端连接在分隔板上,另一端滑动穿过窑体侧壁后伸至窑体外,钢丝绳设置有若干个；落料孔,设置在分隔板上；及负压出料组件,位于冷却区下方,用于将冷却区内的物料输出；通过上述技术方案,解决了现有技术中燃料的浪费及热量的浪费的问题。(The invention relates to the technical field of metallurgical equipment, and provides an energy-saving emission-reducing shaft kiln, which comprises a kiln body, a kiln cover and a kiln cover, wherein the kiln body is provided with a feeding hole and is arranged at the top of the kiln body; the discharge port is arranged at the bottom of the kiln body; an air inlet; the exhaust port is communicated with the air inlet; the partition plates are movably arranged in the kiln body and are sequentially arranged from the feed inlet to the discharge outlet, and the plurality of partition plates divide the cavity in the kiln body into a preheating zone, a primary calcining zone, a secondary calcining zone and a cooling zone; one end of each steel wire rope is connected to the partition plate, the other end of each steel wire rope penetrates through the side wall of the kiln body in a sliding mode and then extends out of the kiln body, and the number of the steel wire ropes is multiple; the blanking hole is arranged on the partition plate; the negative pressure discharging assembly is positioned below the cooling area and used for outputting the materials in the cooling area; through above-mentioned technical scheme, the waste of fuel and the extravagant problem of heat among the prior art have been solved.)

1. An energy-saving emission-reducing shaft kiln is characterized by comprising

A kiln body (1) having

The feeding hole (2) is arranged at the top of the kiln body (1);

the discharge port (3) is arranged at the bottom of the kiln body (1);

the air inlet (4) is arranged at the bottom of the kiln body (1) and is used for conveying air and fuel gas into the kiln body (1); and

the exhaust port (5) is arranged at the top of the kiln body (1) and used for exhausting combusted gas, and the exhaust port (5) is communicated with the air inlet (4);

the separation plates (6) are movably arranged in the kiln body (1), a plurality of separation plates are sequentially arranged from the feed port (2) to the discharge port (3), and the plurality of separation plates (6) divide the inner cavity of the kiln body (1) into a preheating zone (7), a primary calcining zone (8), a secondary calcining zone (9) and a cooling zone (10) which are arranged from top to bottom;

one end of each steel wire rope (11) is connected to the partition plate (6), the other end of each steel wire rope penetrates through the side wall of the kiln body (1) in a sliding mode and then extends out of the kiln body (1), and a plurality of steel wire ropes (11) are arranged;

a blanking hole (12) arranged on the partition plate (6); and

and the negative pressure discharging assembly (13) is positioned below the cooling area (10) and is used for outputting the materials in the cooling area (10).

2. The shaft kiln of claim 1, further comprising

The driving motor is arranged on the outer wall of the kiln body (1); and

and the winding drum (15) is provided with an output shaft of the driving motor, and the steel wire rope (11) is wound on the winding drum (15).

3. The shaft kiln as claimed in claim 1, characterized in that the negative pressure discharge assembly (13) comprises

The negative pressure bin (17) is arranged in the kiln body (1) and is positioned below the cooling area (10); and

the negative pressure door (18) is arranged at the joint of the negative pressure bin (17) and the cooling area (10), and after the negative pressure door (18) is opened or closed, the negative pressure bin (17) is communicated or separated from the cooling area (10).

4. The shaft kiln as recited in claim 3, further comprising

The feeding door (19) is movably arranged at the position of the feeding hole (2);

the air inlet pipe (20) is communicated with the air inlet (4) and is used for conveying fuel gas;

an exhaust pipe (21) communicating with the exhaust port (5); and

the linkage assembly (22) is used for driving the negative pressure door (18) to open when the feeding door (19) is opened.

5. The shaft kiln as claimed in claim 4, wherein the exhaust pipe (21) has a conveying section and a heat exchange section, and the heat exchange section is sleeved outside the air inlet pipe (20).

6. The shaft kiln as claimed in claim 4, characterized in that the kiln body (1) is provided with a swing guide groove (23) at one side close to the negative pressure bin (17), and the negative pressure door (18) comprises

The rotary door (24) is rotatably arranged on the kiln body (1), is close to the negative pressure bin (17), and is provided with a plurality of first holes; and

the swing door (25) is arranged in the swing guide groove (23), is provided with a plurality of second holes and is connected with the rotating door (24) through a convex shaft (26), the axis of one end of the convex shaft (26) is collinear with the axis of the rotating door (24), and the axis of the other end of the convex shaft (26) is collinear with the axis of the swing door (25).

7. The shaft kiln as claimed in claim 6, wherein the feeding gate (19) is provided with a rotary shaft (27) at one end thereof on the kiln body (1) and a linear driving member (28) at the other end thereof on the kiln body (1), the rotary shaft (27) and the rotary gate (24) are provided with teeth, and the linkage assembly (22) comprises

One end of the first gear shaft (29) is meshed with the teeth of the rotating shaft (27) and is an input end, and the other end of the first gear shaft is an output end;

one end of the second gear shaft (30) is meshed with the teeth of the rotating door (24) and is an output end, and the other end of the second gear shaft is an input end; and

a gear shift shaft (31) for connecting or disconnecting the output of the first gear shaft (29) with the input of the second gear shaft (30).

8. The lime production process based on any one of claims 5 to 7, characterized by comprising the following steps

(1) Feeding, namely conveying the limestone crushed into blocks of 50-100mm to the feeding hole (2), opening the feeding door (19) for feeding, and simultaneously driving the negative pressure door (18) to open by the feeding door (19);

(2) preheating, wherein the blocky limestone falls on a first layer of partition plate (6) after passing through a feed inlet (2), heat and high-temperature gas generated in a calcining zone rise to a preheating zone (7) and pass through a blanking hole (12) and a gap of the blocky limestone to preheat the limestone, after the preheating is finished, a winding drum (15) rotates forwards or backwards, so that different steel wire ropes (11) on the partition plate (6) are extended or shortened, and the limestone falls down from the gap between the partition plate (6) and a kiln body (1) and the blanking hole (12) and enters a primary calcining zone (8);

(3) calcining, wherein the block limestone falls down from the gap between the partition board (6) and the kiln body (1) and the blanking hole (12), falls onto the second layer of partition board (6), is calcined, gas generated by combustion and limestone decomposition rises and flows to the preheating zone (7), then flows out along the exhaust port (5) and the exhaust pipe (21), leads the gas and the air to the primary calcining area (8) through the air inlet pipe (20), calcining limestone, ashing the surface layer of the calcined massive limestone, rotating the winding drum (15) forwards or backwards, different steel wire ropes (11) on the partition plate (6) are extended or shortened, limestone falls from a gap between the partition plate (6) and the kiln body (1) and a blanking hole (12) and enters a secondary calcining area (9), the size of the blocky limestone is reduced in the process, an ashing part falls off, and secondary calcining is continuously carried out on the third layer of partition plate (6);

(4) cooling, wherein the lime subjected to secondary calcination falls from the third layer partition plate (6), the ashed lime is crushed and falls into a cooling area (10) for cooling;

(5) discharging, opening the negative pressure door (18), closing the feeding door (19), and adsorbing the ashed lime in the cooling area (10) to output from the negative pressure bin (17) under the negative pressure action of the negative pressure bin (17).

Technical Field

The invention relates to the technical field of metallurgical equipment, in particular to an energy-saving emission-reducing shaft kiln and a lime production process based on the same.

Background

Lime is an air-hardening inorganic gelling material with calcium oxide as a main component; the lime is a product with high calcium carbonate content such as limestone, dolomite, chalk, shells and the like, and is calcined at 900-1100 ℃, and the lime is a cementing material applied by human at the earliest time; at present, lime is prepared by calcining limestone by adopting a shaft kiln, wherein the shaft kiln is thermal equipment for continuously calcining clinker by feeding materials from the upper part and discharging materials from the lower part, and comprises a kiln body, a feeding and discharging device, ventilation equipment and the like; the burning quality in the prior art is difficult to control, so that the limestone has a sandwich or overburning phenomenon, the sandwich makes the utilization rate of the limestone lower, which causes raw material and energy waste, and the overburning makes part of the limestone burnt into black, which affects subsequent use, causes fuel waste and heat waste in the production process, and the production cost is higher.

Disclosure of Invention

The invention provides an energy-saving emission-reducing shaft kiln and a lime production process based on the same, and solves the problems of fuel waste and heat waste in the related technology.

The technical scheme of the invention is as follows:

an energy-saving emission-reducing shaft kiln comprises

A kiln body having

The feed inlet is arranged at the top of the kiln body;

the discharge hole is arranged at the bottom of the kiln body;

the air inlet is arranged at the bottom of the kiln body and used for conveying air and fuel gas into the kiln body; and

the exhaust port is arranged at the top of the kiln body and used for exhausting combusted gas, and the exhaust port is communicated with the air inlet;

the partition plates are movably arranged in the kiln body, and are sequentially arranged from the feed port to the discharge port, and the plurality of partition plates divide the cavity in the kiln body into a preheating zone, a primary calcining zone, a secondary calcining zone and a cooling zone which are arranged from top to bottom;

one end of each steel wire rope is connected to the partition plate, the other end of each steel wire rope penetrates through the side wall of the kiln body in a sliding mode and then extends out of the kiln body, and the number of the steel wire ropes is multiple;

the blanking hole is arranged on the partition plate; and

and the negative pressure discharging assembly is positioned below the cooling area and used for outputting the materials in the cooling area.

The further technical proposal also comprises

The driving motor is arranged on the outer wall of the kiln body; and

and the winding drum is provided with an output shaft of the driving motor, and the steel wire rope is wound on the winding drum.

According to a further technical scheme, the negative pressure discharging assembly comprises

The negative pressure bin is arranged in the kiln body and is positioned below the cooling area; and

and the negative pressure door is arranged at the joint of the negative pressure bin and the cooling area, and the negative pressure bin is communicated or isolated with the cooling area after the negative pressure door is opened or closed.

The further technical proposal also comprises

The feeding door is arranged at the position of the feeding hole;

the gas inlet pipe is communicated with the gas inlet and is used for conveying gas;

an exhaust pipe in communication with the exhaust port; and

and the linkage assembly is used for driving the negative pressure door to be opened when the feeding door is opened.

According to a further technical scheme, the exhaust pipe is provided with a conveying section and a heat exchange section, and the heat exchange section is sleeved on the outer side of the air inlet pipe.

According to a further technical scheme, the kiln body is provided with a swing guide groove which is positioned at one side close to the negative pressure bin, and the negative pressure door comprises

The rotary door is rotatably arranged on the kiln body, is close to the negative pressure bin and is provided with a plurality of first holes; and

the swing door is arranged in the swing guide groove, is provided with a plurality of second holes and is connected with the rotating door through a convex shaft, the axis of one end of the convex shaft is collinear with the axis of the rotating door, and the axis of the other end of the convex shaft is collinear with the axis of the swing door.

According to a further technical scheme, one end of the feeding door is arranged on the kiln body through a rotating shaft, the other end of the feeding door is arranged on the kiln body through a linear driving piece, teeth are arranged on the rotating shaft and the rotating door, and the linkage assembly comprises

One end of the first gear shaft is meshed with the teeth of the rotating shaft and serves as an input end, and the other end of the first gear shaft serves as an output end;

one end of the second gear shaft is meshed with the teeth of the rotating door and is an output end, and the other end of the second gear shaft is an input end; and

and the gear shifting shaft is used for connecting or opening the output end of the first gear shaft and the input end of the second gear shaft.

The lime production process of the energy-saving emission-reducing shaft kiln comprises the following steps

(1) Feeding, namely conveying the limestone crushed into blocks of 50-100mm to a feeding hole, opening a feeding door for feeding, and simultaneously driving a negative pressure door to open;

(2) preheating, wherein the blocky limestone falls on the first layer of partition plate after passing through the feed inlet, heat and high-temperature gas generated in the calcining zone rise to the preheating zone and pass through the blanking hole and the gap of the blocky limestone to preheat the limestone, after the preheating is finished, the winding drum rotates forwards or backwards, so that different steel wire ropes on the partition plate are extended or shortened, and the limestone falls from the gap between the partition plate and the kiln body and the blanking hole and enters a primary calcining zone;

(3) calcining, namely, the blocky limestone falls down from a gap between the partition plate and the kiln body and the blanking hole, falls onto the second layer of partition plate, is calcined, gas generated by combustion and limestone decomposition rises, flows to a preheating zone, flows out along an exhaust port and an exhaust pipe, leads gas and air to a primary calcining zone through an air inlet pipe, and is calcined, the surface layer of the calcined blocky limestone is ashed, then a winding drum rotates forwards or backwards to extend or shorten different steel wire ropes on the partition plate, the limestone falls down from the gap between the partition plate and the kiln body and the blanking hole and enters a secondary calcining zone, the blocky limestone is reduced in the process, the ashed part falls off, and secondary calcining is continuously carried out on the third layer of partition plate;

(4) cooling, wherein the lime subjected to secondary calcination falls from the third layer of partition plate, and the ashed lime is crushed and falls into a cooling area for cooling;

(5) and discharging, opening the negative pressure door, closing the feeding door at the moment, and adsorbing the ashed lime in the cooling area under the negative pressure action of the negative pressure bin to output the ashed lime from the negative pressure bin.

The working principle and the beneficial effects of the invention are as follows:

1. the invention conveys the crushed limestone to a feed inlet, the blocky limestone falls on a first layer of partition plate after passing through the feed inlet, hot gas generated by calcining and burning in a lower layer of calcining zone rises, and the blocky limestone passes through a blanking hole to preheat the limestone on the first layer of partition plate so as to increase the temperature of the limestone and conveniently reduce the heat required by subsequent calcining, after the preheating is finished, different steel wire ropes on the first layer of partition plate are pulled to extend or shorten the different steel wire ropes so as to drive the partition plate to rock and incline, so that the limestone falls from a gap between the partition plate and a kiln body and the blanking hole and enters a first-stage calcining zone, namely a second layer of partition plate, after one-time calcining, the surface of the limestone is difficult to enter an inner core, at the moment, different steel wire ropes on the second layer of partition plate are pulled to extend or ash so as to drive the partition plate to rock and incline, the lime on the surface of the limestone falls down from a gap between the partition plate and the kiln body and the blanking hole and falls into the secondary calcining area, the limestone collides with each other in the process, the lime on the ashed surface layer falls off, the unashed inner core of the limestone falling on the third partition plate is enabled to be leaked out and directly contacted with combustion gas, the calcining speed is accelerated, the calcining time is shortened, the gas consumption required by calcining is greatly saved, after the calcining is completed, the third partition plate shakes, the ashed lime falls into the cooling area, after the cooling is completed, the lime in the cooling area is output by the negative pressure discharging assembly, the limestone is collided in the process, the ashed lime on the surface of the limestone falls off and is crushed, the subsequent reprocessing is reduced, the operation steps are reduced, and the production resources are saved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a front view of the structure of the present invention;

FIG. 2 is a front view of the structure of the negative pressure door of the present invention;

in the figure: 1. the kiln body, 2, a feed inlet, 3, a discharge hole, 4, an air inlet, 5, an exhaust port, 6, a partition plate, 7, a preheating zone, 8, a primary calcining zone, 9, a secondary calcining zone, 10, a cooling zone, 11, a steel wire rope, 12, a blanking hole, 13, a negative pressure discharging component, 15, a winding drum, 17, a negative pressure bin, 18, a negative pressure door, 19, a feeding door, 20, an air inlet pipe, 21, an exhaust pipe, 22, a linkage component, 23, a swing guide groove, 24, a rotating door, 25, a swing door, 26, a convex shaft, 27, a rotating shaft, 28, a linear driving piece, 29, a first gear shaft, 30, a second gear shaft, 31 and a gear shifting shaft.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall be included within the scope of protection of the present invention.

Example 1

As shown in fig. 1 to fig. 2, the embodiment provides an energy-saving emission-reducing shaft kiln, which includes a kiln body 1 having a feeding port 2, and is disposed at the top of the kiln body 1; the discharge port 3 is arranged at the bottom of the kiln body 1; the air inlet 4 is arranged at the bottom of the kiln body 1 and used for conveying air and fuel gas into the kiln body 1; the exhaust port 5 is arranged at the top of the kiln body 1 and used for exhausting combusted gas, and the exhaust port 5 is communicated with the air inlet 4; the partition plates 6 are movably arranged in the kiln body 1, a plurality of partition plates are sequentially arranged from the feed port 2 to the discharge port 3, and the plurality of partition plates 6 divide the inner cavity of the kiln body 1 into a preheating zone 7, a primary calcining zone 8, a secondary calcining zone 9 and a cooling zone 10 which are arranged from top to bottom; one end of each steel wire rope 11 is connected to the partition plate 6, the other end of each steel wire rope penetrates through the side wall of the kiln body 1 in a sliding mode and then extends out of the kiln body 1, and a plurality of steel wire ropes 11 are arranged; the blanking hole 12 is arranged on the partition plate 6; and the negative pressure discharging assembly 13 is positioned below the cooling area 10 and used for outputting the materials in the cooling area 10.

In the embodiment, in order to solve the problems of fuel waste and heat waste in the related art, an energy-saving emission-reducing shaft kiln is designed, wherein crushed limestone is conveyed to a feed inlet 2, the crushed limestone passes through the feed inlet 2 and then falls on a first-layer partition plate 6, hot gas generated by calcining and burning in a lower-layer calcining area rises, and passes through a blanking hole 12 to preheat limestone on the first-layer partition plate 6, so that the temperature of the limestone is increased, and heat required by subsequent calcining is reduced, after preheating is completed, different steel wire ropes 11 on the first-layer partition plate 6 are pulled to extend or shorten different steel wire ropes 11, so that the partition plate 6 is driven to shake and incline, limestone falls from a gap between the partition plate 6 and a kiln body 1 and the blanking hole 12 and enters a primary calcining area 8, namely, on the second-layer partition plate 6, and after one-time calcining, the surface of the limestone is ashed, heat is difficult to enter the inner core, at the moment, different steel wire ropes 11 on the second layer of partition plate 6 are pulled to extend or shorten different steel wire ropes 11, the partition plate 6 is driven to shake and incline, surface limestone falls down from a gap between the partition plate 6 and the kiln body 1 and a blanking hole 12 and falls into the secondary calcining area 9, in the process, the limestone collides with each other, lime on an ashed surface layer falls off, unashed limestone on a third layer of partition plate 6 falls off from the unashed inner core and is directly contacted with combustion gas, the calcining speed is accelerated, the calcining time is shortened, the gas consumption required by calcining is greatly saved, after calcining is completed, the third layer of partition plate 6 shakes to enable the ashed lime to fall into the cooling area 10, after cooling is completed, the lime in the ashing cooling area 10 is output by the negative pressure discharge assembly 13, in the process, the limestone collides, and falls off on the surface of the limestone, And the crushing reduces subsequent reprocessing, reduces operation steps and saves production resources.

As shown in fig. 1-2, the kiln further comprises a driving motor arranged on the outer wall of the kiln body 1; and the winding drum 15 is arranged on an output shaft of the driving motor, and the steel wire rope 11 is wound on the winding drum 15.

In this embodiment, driving motor sets up on the outer wall of the kiln body 1, drives reel 15 corotation or reversal, and reel 15 drives the wire rope extension that links to each other with it or shortens for division board 6 rocks under the effect of gravity, makes the limestone on the division board 6 collide each other, and falls along the clearance of division board 6 and the kiln body 1 and blanking hole 12.

As shown in fig. 1 to 2, the negative pressure discharging assembly 13 includes a negative pressure bin 17 disposed in the kiln body 1 and below the cooling zone 10; and the negative pressure door 18 is arranged at the joint of the negative pressure bin 17 and the cooling area 10, and after the negative pressure door 18 is opened or closed, the negative pressure bin 17 is communicated or separated with the cooling area 10.

In this embodiment, the negative pressure storehouse 17 is the negative pressure state, during the ejection of compact, the negative pressure door 18 is opened, make cooling area 10 and negative pressure storehouse 17 communicate, under the negative pressure effect in negative pressure storehouse 17, the lime in the cooling area 10 is taken out to the negative pressure storehouse 17 in, after the lime pumping is accomplished, close negative pressure door 18, separate negative pressure storehouse 17 and cooling area 10, make the inside confined space that forms of kiln body 1, be convenient for carry on subsequent calcination, guarantee the calcination quality of lime stone.

As shown in fig. 1 to fig. 2, the device further comprises a feeding gate 19, which is arranged at the position of the feeding port 2, and the feeding gate 19 is linked with the negative pressure gate 18 to open or close when being opened or closed; an air inlet pipe 20 communicated with the air inlet 4 for conveying gas; an exhaust pipe 21 communicating with the exhaust port 5; and the linkage assembly 22 is used for driving the negative pressure door 18 to open when the feeding door 19 is opened.

In this embodiment, the feeding gate 19 sets up the position department at feed inlet 2, lime in cooling zone 10 carries out the ejection of compact when, negative pressure door 18 is opened, feeding gate 19 closes, when feeding in raw material to preheating zone 7, feeding gate 19 opens, linkage negative pressure door 18 opens, make cooling zone 10 and negative pressure storehouse 17 intercommunication, kiln body 1 inside space and negative pressure storehouse 17 intercommunication promptly, make the gas in the kiln body 1 flow to negative pressure storehouse 17, make the gas and the heat that calcine the production flow to the direction in negative pressure storehouse 17, avoid the gas and the lime dust in the kiln body 1 to locate the outside diffusion from feed inlet 2, and cause environmental pollution and wasting of resources, and make things convenient for feed inlet 2 to feed in raw material.

As shown in fig. 1 to 2, the exhaust pipe 21 has a conveying section and a heat exchange section, and the heat exchange section is sleeved outside the intake pipe 20.

In this embodiment, the heat transfer section cover of blast pipe 21 is established in the intake pipe 20 outside for have thermal calcining gas, preheat gas and air, make the temperature of gas itself rise, be convenient for carry out follow-up burning, and make the gas have higher initial temperature when entering the calcining zone, reduced the heating intensification of calcining zone to gas and air, make the heat in calcining zone all be used for the calcination of lime stone, improved thermal utilization ratio.

As shown in fig. 1 to 2, a swing guide groove 23 is arranged on the kiln body 1 and is located at one side close to the negative pressure bin 17, and the negative pressure door 18 comprises a rotating door 24 which is rotatably arranged on the kiln body 1 and is close to the negative pressure bin 17 and is provided with a plurality of first holes; and the swing door 25 is arranged in the swing guide groove 23, is provided with a plurality of second holes and is connected with the rotating door 24 through a convex shaft 26, the axis of one end of the convex shaft 26 is collinear with the axis of the rotating door 24, and the axis of the other end of the convex shaft 26 is collinear with the axis of the swing door 25.

In this embodiment, the kiln body 1 is provided with a swing guide groove 23, the swing door 25 moves or rotates in the swing guide groove 23, and the rotating door 24 is arranged on the kiln body 1, when the negative pressure door 18 is in a closed state, the rotating door 24 is stationary, and a first hole on the rotating door and a second hole on the swing door 25 are arranged in a staggered manner at intervals and are not communicated; when the negative pressure door 18 is opened, the rotating door 24 rotates, the swing door 25 is positioned on one side of the rotating door 24, the rotating door 24 rotates to drive the swing door 25 to swing through the convex shaft 26, so that a second hole in the swing door 25 is overlapped with a first hole in the rotating door 24, the rotating door 24 stops rotating, and blanking is performed; or the rotating door 24 continues to rotate to perform intermittent blanking, and meanwhile, the lime is extruded and crushed by the second hole of the swinging door 25 and the first hole of the rotating door 24, so that the subsequent crushing is reduced.

As shown in fig. 1 to 2, one end of the feeding gate 19 is disposed on the kiln body 1 through a rotating shaft 27, the other end is disposed on the kiln body 1 through a linear driving member 28, teeth are disposed on the rotating shaft 27 and the rotating gate 24, the linkage assembly 22 includes a first gear shaft 29, one end of which is engaged with the teeth of the rotating shaft 27 and is an input end, and the other end of which is an output end; a second gear shaft 30 having one end engaged with the teeth of the rotary door 24 as an output end and the other end as an input end; and a shift shaft 31 for connecting or disconnecting the output end of the first gear shaft 29 and the input end of the second gear shaft 30.

In this embodiment, the linkage assembly 22 is used for linking or canceling the linkage between the feeding door 19 and the negative pressure door 18, so that the feeding door 19 is opened to drive the negative pressure door 18 to be opened, the feeding door 19 is closed to drive the negative pressure door 18 to be closed, but the opening or closing of the negative pressure door 18 does not affect the feeding door 19, the linkage assembly 22 includes a first gear shaft 29, a second gear shaft 30 and a shift shaft 31, and the shift shaft 31 moves to connect or open the output end of the first gear shaft 29 and the input end of the second gear shaft 30, thereby realizing the linkage or canceling the linkage between the feeding door 19 and the negative pressure door 18.

A process for producing lime comprises the following steps

(1) Feeding, namely conveying the limestone crushed into blocks of 50-100mm to the feeding port 2, opening the feeding gate 19 for feeding, and simultaneously driving the negative pressure gate 18 to open by the feeding gate 19;

(2) preheating, wherein the blocky limestone falls on a first-layer partition plate 6 after passing through a feed inlet 2, heat and high-temperature gas generated in a calcining zone rise to a preheating zone 7 and pass through a blanking hole 12 and a gap of the blocky limestone to preheat the limestone, after the preheating is finished, a winding drum 15 rotates forwards or backwards, so that different steel wire ropes 11 on the partition plate 6 are extended or shortened, and the limestone falls from the gap between the partition plate 6 and a kiln body 1 and the blanking hole 12 and enters a primary calcining zone 8;

(3) calcining, wherein, the blocky limestone falls down from the gap between the partition plate 6 and the kiln body 1 and the blanking hole 12 and falls on the second layer of partition plate 6, calcining is carried out, gas generated by combustion and limestone decomposition rises, flows to the preheating zone 7, then flows out along the exhaust port 5 and the exhaust pipe 21, fuel gas and air are led to the primary calcining zone 8 through the air inlet pipe 20, the limestone is calcined, the surface layer of the calcined blocky limestone is ashed, then the winding drum 15 rotates forwards or backwards, so that different steel wire ropes 11 on the partition plate 6 are extended or shortened, the limestone falls down from the gap between the partition plate 6 and the kiln body 1 and the blanking hole 12 and enters the secondary calcining zone 9, the blocky limestone is reduced in the process, the ashed part falls off, and secondary calcining is carried out on the third layer of partition plate 6 continuously;

(4) cooling, wherein the lime subjected to secondary calcination falls from the third-layer partition plate 6, the ashed lime is crushed and falls into a cooling area 10 for cooling;

(5) discharging, opening the negative pressure door 18, closing the feeding door 19 at the moment, and adsorbing the ashed lime in the cooling area 10 to be output from the negative pressure bin 17 under the negative pressure action of the negative pressure bin 17.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.