阅读说明：本技术 通过具有独立冷却装置的石灰竖窑生产石灰的方法及竖窑 (Method for producing lime by means of a lime shaft kiln with an independent cooling device and shaft kiln ) 是由 王长春 陈辉 孙健 于 2020-12-24 设计创作，主要内容包括：本发明实施例提供一种通过具有独立冷却装置的石灰竖窑生产石灰的方法及竖窑,石灰竖窑包括窑体和窑体上的预热段和煅烧段,石灰石矿料自窑体顶端的入口被输送到窑体的预热段；石灰石矿料在预热段内被预热；预热后的石灰石矿料进入到设于预热段下方的煅烧段进行煅烧,石灰石矿料煅烧生成成品石灰以及附带产物二氧化碳,煅烧生成的高温石灰被输送到设于窑体外的冷却装置内进行冷却。将煅烧后的高温石灰转移到独立的冷却装置内,可以采用各种急冷工艺对石灰进行冷却,同时冷却风不会进入煅烧段,能够生成高质量的高活性石灰。(The embodiment of the invention provides a method for producing lime by a lime shaft kiln with an independent cooling device and the shaft kiln, wherein the lime shaft kiln comprises a kiln body, a preheating section and a calcining section on the kiln body, and limestone mineral aggregate is conveyed to the preheating section of the kiln body from an inlet at the top end of the kiln body; the limestone ore material is preheated in the preheating section; the preheated limestone mineral aggregate enters a calcining section arranged below the preheating section for calcining, the limestone mineral aggregate is calcined to generate finished lime and byproduct carbon dioxide, and the high-temperature lime generated by calcining is conveyed into a cooling device arranged outside the kiln body for cooling. The calcined high-temperature lime is transferred into an independent cooling device, various quenching processes can be adopted to cool the lime, and meanwhile, cooling air does not enter a calcining section, so that high-quality high-activity lime can be generated.)

1. The method for producing lime by the lime shaft kiln with the independent cooling device is characterized in that the lime shaft kiln comprises a kiln body (2), a preheating section and a calcining section are arranged in the kiln body (2), and the calcining section is arranged below the preheating section;

conveying limestone ore materials from an inlet at the top end of the kiln body (2) to a preheating section in the kiln body (2); the limestone ore material is preheated in the preheating section;

the preheated limestone mineral aggregate enters a calcining section below the preheating section, the preheated limestone mineral aggregate is calcined and decomposed in the calcining section, the limestone mineral aggregate is calcined to generate finished lime and byproduct carbon dioxide, and the calcined lime is conveyed into a cooling device (4) arranged outside the kiln body (2) for cooling;

before the high-temperature finished lime reacts with carbon dioxide reversely to recombine into calcium carbonate, the high-temperature finished lime is conveyed into a cooling device (4) through a discharging mechanism (3), the high-temperature finished lime is cooled through the cooling device (4), and then the cooled finished lime is conveyed to a designated place.

2. Method for producing lime by means of a lime shaft kiln with separate cooling device according to claim 1, characterised in that the cooling device (4) has a cooling chamber and a cooling fan (5);

the high-temperature finished lime is conveyed into a cooling device (4) through a discharging mechanism (3), and the high-temperature finished lime is cooled through the cooling device (4), and the high-temperature finished lime cooling device comprises:

before the carbon dioxide and the high-temperature lime are subjected to reverse reaction and recombined into calcium carbonate, the high-temperature finished lime is conveyed into a cooling chamber;

when the cooling device (4) works, air is blown into the cooling chamber through the cooling fan (5), a large amount of air in the cooling chamber forms a quenching cooling air flow, and the quenching cooling air flow passes through gaps between the high-temperature lime and cools the high-temperature lime to a preset temperature.

3. The method for producing lime by means of a lime shaft kiln with independent cooling means according to claim 1, further comprising:

the lime shaft kiln is provided with a feeding mechanism (3), and limestone mineral aggregate is conveyed to a preheating section in the kiln body (2) from an inlet at the top end of the kiln body (2) through the feeding mechanism (3).

4. Method for producing lime by means of a lime shaft kiln with independent cooling means according to claim 1, characterised in that it comprises:

the waste cooling air after cooling the high temperature lime in the cooling chamber is used for preheating the combustible gas and the combustion air, and/or the waste cooling air after cooling the high temperature lime in the cooling chamber is used as the combustion air.

5. The method for producing lime by means of a lime shaft kiln with independent cooling means according to claim 1, further comprising:

when the limestone ore material is calcined in the calcining section, hot flue gas is generated and upwards enters the preheating section to preheat the limestone ore material in the preheating section, wherein the hot flue gas comprises byproduct carbon dioxide generated by calcining the limestone ore material.

6. The method for producing lime by means of a lime shaft kiln with independent cooling means according to claim 5, further comprising:

the hot flue gas preheats the limestone mineral aggregate in the preheating section and then becomes waste flue gas, the waste flue gas is discharged out of the kiln body (2) from a smoke outlet at the top end of the kiln body (2) and enters a dust removal device, and the dust removal device removes dust from the waste flue gas to enable the waste flue gas to reach the emission standard.

7. A lime shaft kiln with an independent cooling device is characterized by comprising:

comprises a kiln body (2) and a cooling device (4) which is arranged outside the kiln body (2) and is used for cooling high-temperature lime;

the top end of the kiln body (2) is provided with an inlet for conveying limestone mineral aggregate, a preheating section for preheating the limestone mineral aggregate and a calcining section for calcining the limestone mineral aggregate are arranged in the kiln body (2), and the calcining section is arranged below the preheating section;

the cooling device (4) is used for cooling high-temperature lime generated by calcining limestone ore materials in the calcining section, wherein the high-temperature lime is conveyed into the cooling device (4) before being subjected to reverse reaction with carbon dioxide and recombined into calcium carbonate;

the lime shaft kiln also comprises a discharging mechanism (5) for conveying high-temperature lime in the calcining section to the cooling device (4), one end of the discharging mechanism (5) is arranged in the calcining section, and the other end of the discharging mechanism is connected to the cooling device (4).

8. Lime shaft kiln with independent cooling means according to claim 7, characterized in that the cooling means (4) have a cooling chamber and a cooling fan (5); the cooling fan (5) is connected to the cooling chamber through a pipeline, and the cooling fan (5) blows air into the cooling chamber through the pipeline;

the cooling chamber is provided with a high-temperature lime inlet and a lime discharge outlet;

the cooling chamber is also provided with a waste cooling air discharge pipeline which is respectively connected with a heat exchanger of combustible gas/combustion-supporting air, and/or the waste cooling air discharge pipeline is connected with a combustion-supporting air pipeline, and waste cooling air discharged from the waste cooling air discharge pipeline is directly used as combustion-supporting air after being dedusted.

9. The lime shaft kiln with independent cooling device according to claim 7, characterized in that the kiln body (2) has an exhaust port provided at the top end thereof, and the lime shaft kiln further comprises a dust removal device for removing dust from the waste flue gas generated by calcining the limestone mineral aggregate, the dust removal device being connected to the exhaust port of the kiln body (2).

10. The lime shaft kiln having a separate cooling device according to claim 8, characterized in that the cooling device comprises: a vertical cooler, a belt cooler, or an annular cooler.

Technical Field

The invention relates to the technical field of lime industry, in particular to a method for producing lime by a lime shaft kiln with an independent cooling device and the shaft kiln.

Background

Lime is an important raw material for many industries and is widely applied to industries such as buildings, steel, calcium carbide, medicines, leather, textiles and the like; wherein, the activity is the main index for measuring the quality, influence performance and price of the lime. The high-activity lime can not only improve the quality and the production efficiency of downstream products, but also reduce the dosage of the downstream products to the lime, so that the development of a new process and the production of the high-activity lime become one of the main targets obtained by lime practitioners.

The high-activity lime has the characteristics of porosity of more than 40%, sponginess, low volume density of 1.7-2.0 g/cubic centimeter, large specific surface area of 0.5-1.3 square meters/g, fine lime grains and high melting capacity in the slagging process. To achieve the above features, the prevention of raw burning and overburning, uniform calcination and sufficient heat are key points that need to be grasped in the lime processing process.

In the process of implementing the invention, the applicant finds that at least the following problems exist in the prior art: in the conventional shaft kiln which has been used, the calcining section and the cooling section are connected up and down, and the cooling air goes up to the calcining section, so that the calcining efficiency is lowered and the quality of lime is difficult to stabilize, and it is difficult to obtain high-activity lime.

Disclosure of Invention

The embodiment of the invention provides a method for producing lime by a lime shaft kiln with an independent cooling device and the shaft kiln.

In order to achieve the above objects, in one aspect, embodiments of the present invention provide a method for producing lime by a lime shaft kiln having an independent cooling device, the lime shaft kiln including a kiln body, the kiln body having a preheating section and a calcining section, the calcining section being disposed below the preheating section;

conveying limestone mineral aggregate from an inlet at the top end of the kiln body to a preheating section in the kiln body; the limestone ore material is preheated in the preheating section;

the preheated limestone mineral aggregate enters a calcining section arranged below the preheating section, the preheated limestone mineral aggregate is calcined and decomposed in the calcining section, the limestone mineral aggregate is calcined to generate finished lime and byproduct carbon dioxide, the temperature of the calcined lime is very high, and the high-temperature lime is conveyed into a cooling device arranged outside the kiln body to be cooled;

before the high-temperature finished product lime and carbon dioxide are subjected to reverse reaction and recombined to form calcium carbonate, the high-temperature lime is conveyed into a cooling device through a discharging mechanism, the high-temperature lime is cooled to a preset temperature through the cooling device, and the lime cooled to the preset temperature is conveyed to a specified place.

Preferably, the cooling device has a cooling chamber and a cooling fan;

before carbon dioxide and high temperature lime take place the reverse reaction and recombine calcium carbonate, carry high temperature lime to cooling device in, cool high temperature lime to preset temperature through cooling device, include:

before the high-temperature finished product lime undergoes reverse reaction and is recombined into calcium carbonate, the high-temperature lime is conveyed into a cooling chamber through a discharging mechanism;

when the cooling device works, air is blown into the cooling chamber through the cooling fan, a large amount of air in the cooling chamber forms quenching cooling air flow, and the quenching cooling air flow cools the high-temperature lime to a preset temperature when passing through gaps between the high-temperature lime.

Preferably, the method further comprises the following steps:

the lime shaft kiln is provided with a feeding mechanism, and limestone mineral aggregate is conveyed to a preheating section in the kiln body from an inlet at the top end of the kiln body through the feeding mechanism.

Preferably, the method comprises the following steps:

the waste cooling air after cooling the high-temperature lime in the cooling chamber can be used for preheating combustible gas and combustion-supporting air, and/or the waste cooling air after cooling the high-temperature lime in the cooling chamber can be used as the combustion-supporting air after dedusting.

Preferably, the method further comprises the following steps:

when the limestone ore material is calcined in the calcining section, hot flue gas is generated and upwards enters the preheating section to preheat the limestone ore material in the preheating section, wherein the hot flue gas comprises byproduct carbon dioxide generated by calcining the limestone ore material.

Preferably, the method further comprises the following steps:

the hot flue gas preheats the limestone mineral aggregate in the preheating section and then becomes waste flue gas, the waste flue gas is discharged out of the kiln body from a smoke outlet at the top end of the kiln body and enters a dust removal device, and the dust removal device removes dust from the waste flue gas so that the waste flue gas reaches the emission standard.

In another aspect, an embodiment of the present invention provides a lime shaft kiln with an independent cooling device, including:

comprises a kiln body and a cooling device which is arranged outside the kiln body and used for cooling high-temperature lime;

the top end of the kiln body is provided with an inlet for conveying limestone mineral aggregate, the kiln body is internally provided with a preheating section for preheating the limestone mineral aggregate and a calcining section for calcining the limestone mineral aggregate, and the calcining section is arranged below the preheating section;

the cooling device is used for cooling high-temperature lime generated by calcining limestone ore materials in the calcining section, wherein the high-temperature lime is conveyed into the cooling device before being subjected to reverse reaction with carbon dioxide and recombined into calcium carbonate;

the lime shaft kiln also comprises a discharging mechanism for conveying high-temperature lime in the calcining section to the cooling device, one end of the discharging mechanism is arranged in the calcining section, and the other end of the discharging mechanism is connected to the cooling device.

Preferably, the cooling device has a cooling chamber and a cooling fan; the cooling fan is connected with the cooling chamber through a pipeline, and blows air into the cooling chamber through the pipeline;

the cooling chamber is provided with a high-temperature lime inlet and a lime discharge outlet;

the cooling chamber is also provided with a waste cooling air discharge pipeline which is respectively connected with a heat exchanger of combustible gas and combustion air, and/or the waste cooling air discharge pipeline is connected with a combustion air pipeline and directly used as the combustion air after the waste cooling air discharged by the waste cooling air discharge pipeline is dedusted.

Preferably, the kiln body is provided with a smoke outlet arranged at the top end of the kiln body, the lime shaft kiln further comprises a dust removal device used for removing dust from waste flue gas generated by calcining limestone mineral aggregate, and the dust removal device is connected with the smoke outlet of the kiln body.

Preferably, the cooling device may employ a vertical cooler, a belt cooler, or an annular cooler.

The technical scheme has the following beneficial effects: and (2) cooling lime by adopting an independent cooling device outside a kiln body of the shaft kiln, completing preheating and calcining in the shaft kiln when the lime is produced, and calcining limestone mineral aggregate in a calcining section to obtain the lime, wherein the lime is at a high temperature. The calcined high-temperature lime is transferred into the independent cooling device, the lime finished product can be cooled by adopting the independent cooling device, and then cooling air can not enter the calcining section, so that the influence of the cooling air on the temperature of the calcining section can be avoided, the lime can be rapidly cooled by fully utilizing the cooling air, the porosity of the lime can be improved, and the formed high-quality and high-activity lime with small crystal grains, low volume density and large specific surface area can be obtained.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flow chart of a method for producing lime by a lime shaft kiln having a separate cooling device according to an embodiment of the present invention.

The reference numerals are represented as:

1. a feeding mechanism; 2. a kiln body; 3. a discharge mechanism; 4. a cooling device; 5. a cooling fan; 6. finished product conveyor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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 fall within the protection scope of the present invention.

In connection with an embodiment of the present invention, there is provided a method for producing lime by a lime shaft kiln having an independent cooling device, the lime shaft kiln including a kiln body 2, a preheating section and a calcining section provided in the kiln body 2, the calcining section being provided below the preheating section.

Conveying limestone ore material from an inlet at the top end of the kiln body 2 to a preheating section in the kiln body 2; the limestone ore charge is preheated in the preheating section.

The preheated limestone mineral aggregate enters a calcining section arranged below the preheating section, the limestone mineral aggregate is calcined and decomposed in the calcining section (the limestone mineral aggregate is calcined until the limestone mineral aggregate is decomposed), the limestone mineral aggregate is calcined to generate finished lime and byproduct carbon dioxide, and the calcined lime has very high temperature, namely high-temperature finished lime (the high temperature is common knowledge in the field and is generally higher than 1000 ℃, and the high-temperature finished lime is conveyed into a cooling device 4 arranged outside the kiln body 2 to be cooled.

Before the high-temperature finished lime and carbon dioxide are subjected to reverse reaction and recombined to form calcium carbonate, the high-temperature lime is conveyed into a cooling device 4 through a discharging mechanism 3, the high-temperature lime is cooled to a preset temperature through the cooling device 4, and the lime cooled to the preset temperature is conveyed to a designated place through a finished product conveying device 6.

Preferably, the cooling device 4 is arranged outside the kiln body and is close to the kiln body, so that the high-temperature finished lime is discharged into the cooling device 4 from the calcining section in time, and the problem that carbon dioxide reacts with calcium oxide reversely to recombine into calcium carbonate is avoided.

A lime kiln device which cools lime by adopting an independent cooling device 4 outside a kiln body 2 of a shaft kiln is adopted, limestone mineral aggregate is preheated and calcined in the shaft kiln, and high-temperature finished lime is obtained after calcination. The calcined high-temperature lime is conveyed into the independent cooling device 4, and the lime finished product is cooled by the independent cooling device 4, so that cooling air does not enter the calcining section, the influence of the cooling air on the temperature of the calcining section is not considered, the cooling air can be fully utilized to rapidly cool the lime, the porosity of the lime can be improved, the formed lime has small crystal grains, low volume density and large specific surface area, and high-quality and high-activity lime is generated. The independent cooling device 4 can adopt various cooling forms and waste heat recovery technologies, is not limited by the structure of the kiln body 2, and meanwhile, only the kiln body 2 of the preheating section and the calcining section has simpler structure, the kiln bottom is provided with a hot lime discharging device (discharging mechanism), and the lime which is calcined and decomposed is discharged at the kiln bottom at the uniform temperature.

Preferably, the cooling device 4 has a cooling chamber and a cooling fan 5.

The guarantee carry high temperature lime to cooling device 4 in before carbon dioxide takes place the reverse reaction with high temperature lime and recombines into calcium carbonate, cool high temperature lime to preset temperature through cooling device 4, include:

before the carbon dioxide and the high-temperature lime are subjected to reverse reaction and recombined into calcium carbonate, the high-temperature lime is conveyed into a cooling chamber through a discharging mechanism 3; when the cooling device 4 works, air is blown into the cooling chamber through the cooling fan 5, in the cooling chamber, a large amount of air forms high-speed quenching cooling air flow, and the high-speed quenching cooling air rapidly cools high-temperature lime to a preset temperature, so that high-activity lime is obtained. The principle is as follows: the limestone ore material is decomposed into lime (calcium oxide) and carbon dioxide through high-temperature calcination, the carbon dioxide is separated out from the limestone (calcium carbonate), the remaining calcium oxide has a plurality of gaps, the process is promoted by high-temperature heat exchange, a large amount of high-speed quenching cooling air flow in the cooling chamber rapidly fixes the gaps in the flowing process, the gaps actually increase the surface area of the calcium oxide, the larger the surface area of the calcium oxide is, the higher the activity is, and therefore, the activity of the calcined high-temperature lime is improved through quenching. Compared with the cooling method of cooling the high-temperature lime by blowing cooling air from the bottom in the lime kiln, the cooling fan can blow cooling air from the bottom and the side of the high-temperature lime at multiple angles simultaneously in a quenching mode, and the high-temperature lime is cooled by high-speed cooling air flow (cooling air), so that the cooling efficiency is improved.

Meanwhile, the other problem caused by the communication of the cooling section and the calcining section is avoided, namely that low-temperature cooling air enters the preheating section through the calcining section to cause the excess of heat of the preheating section, so that the kiln top temperature is improved.

Wherein the cooling device can be a vertical cooler, a belt cooler or a ring cooler, or a device adopting other cooling methods

Preferably, the method further comprises the following steps: the lime shaft kiln is provided with a feeding mechanism 1, and limestone mineral aggregate is conveyed to a preheating section in the kiln body 2 from an inlet at the top end of the kiln body 2 through the feeding mechanism 1.

Preferably, the lime shaft kiln also comprises other devices, such as heat supply devices, for providing heat for the decomposition of the limestone mineral aggregate. The method for producing lime by means of a lime shaft kiln having a separate cooling device further comprises:

the cooling chamber is also provided with a waste cooling air discharge pipeline which is respectively connected with a combustible gas/combustion-supporting air heat exchanger, and the waste cooling air after the high-temperature lime is cooled in the cooling chamber is conveyed to the combustible gas heat exchanger or the combustion-supporting air heat exchanger so as to be used for preheating the combustible gas and the combustion-supporting air. And/or the waste cooling air discharge pipeline is connected with a combustion-supporting air pipeline, and waste cooling air discharged by the waste cooling air discharge pipeline is conveyed to a heat supply device after being dedusted so as to be used as combustion-supporting air; wherein, the high-temperature waste cooling air is used as combustion-supporting air, so that the consumption of combustible gas can be saved. Calcination of the lime ore produces hot flue gases (including CO from the decomposition of limestone)₂) And the hot flue gas enters a preheating section to preheat the limestone ore material. The hot flue gas and limestone mineral aggregate are subjected to heat exchange, the temperature is reduced (waste flue gas is formed at the moment), the reduced flue gas is discharged out of the kiln body 2 and then enters the dust removal device, and the dust removal device removes dust from the waste flue gas to enable the waste flue gas to reach the emission standard, so that the waste flue gas is discharged into the atmosphere from the smoke discharge chimney. Or the waste heat can be recovered by the waste heat recovery system before entering the dust removal device, and then dust removal is carried out.

Preferably, the method further comprises the following steps:

when the limestone ore material is calcined in the calcining section, hot flue gas is generated and upwards enters the preheating section to preheat the limestone ore material in the preheating section, wherein the hot flue gas comprises byproduct carbon dioxide generated by calcining the limestone ore material. The preheated limestone ore charge is fed into the calcination section, and a high-temperature heat carrier (such as high-temperature flue gas, hot air or other high-temperature gas medium) is fed into the calcination section, wherein the high-temperature heat carrier is used for calcining the limestone ore charge, and the calcined limestone ore charge is used for generating lime and hot flue gas (including CO generated by decomposing limestone)₂) And the hot flue gas enters the preheating section to waste heat limestone ore material. The hot flue gas is discharged out of the kiln body 2 after being subjected to heat exchange with limestone mineral aggregate and then enters a dust removal device, and the dust removal device removes dust from the waste flue gas so that the waste flue gas reaches the emission standard and is discharged into the atmosphere from a smoke discharge chimney. Or the waste heat can be recovered by the waste heat recovery system before entering the dust removal device, and then dust removal is carried out.

Preferably, the method further comprises the following steps:

the hot flue gas preheats the limestone mineral aggregate in the preheating section and then becomes waste flue gas, the waste flue gas is discharged out of the kiln body 2 from a smoke outlet at the top end of the kiln body 2 and enters a dust removal device, and the dust removal device removes dust from the waste flue gas so that the waste flue gas reaches the emission standard and is discharged into the atmosphere from a smoke discharge chimney.

The present invention also provides a lime shaft kiln (or shaft kiln system) having an independent cooling device, comprising:

comprises a kiln body 2 and a cooling device 4 which is arranged outside the kiln body 2 and is used for cooling high-temperature lime.

The top end of the kiln body 2 is provided with an inlet for conveying limestone mineral aggregate, a preheating section for preheating the limestone mineral aggregate and a calcining section for calcining the limestone mineral aggregate are arranged in the kiln body 2, and the calcining section is arranged below the preheating section.

The cooling device 4 is used for cooling the high-temperature lime generated by calcining the limestone ore material in the calcining section, wherein the high-temperature lime is conveyed into the cooling device 4 before being subjected to reverse reaction with the carbon dioxide to be recombined into the calcium carbonate. The cooling device 4 is arranged outside the kiln body and is close to the kiln body, so that the high-temperature lime can be timely conveyed into the cooling device 4 and can be timely cooled, and the problem that the carbon dioxide and calcium oxide react reversely to recombine into calcium carbonate is avoided.

The lime shaft kiln also comprises a discharging mechanism 5 for conveying high-temperature lime in the calcining section to the cooling device 4, wherein one end of the discharging mechanism 5 is arranged in the calcining section, and the other end of the discharging mechanism 5 is connected to the cooling device 4.

A lime kiln device which cools lime by adopting an independent cooling device 4 outside a kiln body 2 of a shaft kiln is adopted, when lime is produced, preheating and calcining are completed in the shaft kiln, and limestone mineral aggregates are calcined in a calcining section to obtain high-temperature lime. The calcined high-temperature lime is transferred into the independent cooling device 4, and the lime finished product is cooled by the independent cooling device 4, so that cooling air cannot enter the calcining section, the adverse effect of the cooling air on the calcining section is avoided, high-speed cooling air can be fully utilized to rapidly cool the high-temperature lime, the porosity of the lime is improved, the formed lime crystal grains are fine, the volume density is low, the specific surface area is large, and the high-quality and high-activity lime is generated. The independent cooling device 4 can adopt various cooling forms and waste heat recovery technologies, is not limited by the structure of the kiln body 2, and meanwhile, only the kiln body 2 of the preheating section and the calcining section has simpler structure, the kiln bottom is provided with a hot lime discharging device (discharging mechanism), and lime which is calcined and decomposed can be discharged at the kiln bottom at the uniform temperature.

The lime shaft kiln with the independent cooling device can be in the forms of a single-chamber shaft kiln system, an external combustion type lime shaft kiln, a direct combustion type lime shaft kiln (an air gas burner is arranged at a calcining section), and the like.

Wherein, a feeding mechanism 1 is arranged at the upper part of a kiln body 2, limestone mineral aggregate is fed into the kiln body 2 through the feeding mechanism 1, passes through a preheating section and a calcining section of the kiln body 2 from top to bottom, is discharged out of the kiln body 2 through a discharging mechanism 3, enters a cooling device 4, cooling air is blown into a cooling chamber of the cooling device 4 by a cooling fan 5, and cooled finished lime falls into a finished product conveying device 6.

Preferably, the cooling device 4 has a cooling chamber and a cooling fan 5; the cooling fan 5 is connected to the cooling chamber through a pipeline, and the cooling fan 5 blows air into the cooling chamber through the pipeline. When the cooling device 4 works, air is blown into the cooling chamber through the cooling fan 5, a large amount of air in the cooling chamber forms quenching cooling air flow, and the quenching cooling air flow cools the high-temperature lime to a preset temperature when passing through gaps between the high-temperature lime, so that the high-activity lime is obtained in a quenching mode. The principle is as follows: the limestone ore material is decomposed into lime (calcium oxide) and carbon dioxide through high-temperature calcination, the carbon dioxide is separated out from the limestone (calcium carbonate), the remaining calcium oxide has a plurality of gaps, the process is promoted by high-temperature heat exchange, a large amount of quenching cooling air flow in the cooling chamber rapidly fixes the gaps in the flowing process, the gaps actually increase the surface area of the calcium oxide, the larger the surface area of the calcium oxide is, the higher the activity is, and therefore, the lime generated in the calcination section is quenched to be beneficial to improving the activity. Compare and blow the cooling air from the bottom in lime kiln and cool off high temperature lime, so-called quench (mode) is through cooling blower from the bottom of high temperature lime, the side multi-angle cooling air of blowing simultaneously, then has a large amount of cooling air current (cooling air) to cool off high temperature lime, improves cooling effect through increasing cooling area, improves cooling efficiency.

Meanwhile, the other problem caused by the communication of the cooling section and the calcining section is avoided, namely that low-temperature cooling air enters the preheating section through the calcining section to cause the excess of heat of the preheating section, so that the kiln top temperature is improved.

The cooling chamber has a high temperature lime inlet and a lime discharge outlet. The cooling chamber is also provided with a waste cooling air discharge pipeline which is respectively connected with a heat exchanger of combustible gas and combustion-supporting air, and/or the waste cooling air discharge pipeline is connected with a channel for combustion-supporting air, and high-temperature cooling air discharged from the waste cooling air discharge pipeline is used as combustion-supporting air after being dedusted; wherein, the high-temperature combustion-supporting gas is beneficial to reducing the combustion consumption of combustible gas.

Preferably, the kiln body is provided with a smoke outlet arranged at the top end of the kiln body, and the lime shaft kiln systemThe system also comprises a dust removal device for removing dust from the waste flue gas, wherein the dust removal device is connected with the smoke outlet of the kiln body. The preheated limestone ore charge is fed into the calcination section, and a high-temperature heat carrier (such as high-temperature flue gas, hot air or other high-temperature gas medium) is also fed into the calcination section, the high-temperature heat carrier is used for calcining the limestone ore charge, and the calcined limestone ore charge is used for generating lime and hot flue gas (including CO generated by decomposing limestone) simultaneously₂) And the hot flue gas enters a preheating section to preheat limestone ore materials. The hot flue gas and limestone mineral aggregate are subjected to heat exchange, the temperature of the hot flue gas is reduced, the hot flue gas is discharged out of the kiln body 2 and then enters a dust removal device, and the dust removal device removes dust from the waste flue gas to enable the waste flue gas to reach the emission standard, so that the waste flue gas is discharged into the atmosphere from a smoke discharge chimney. Or the waste heat can be recovered by the waste heat recovery system before entering the dust removal device, and then dust removal is carried out.

Preferably, the cooling device may be a vertical cooler, a belt cooler, or a ring cooler, or a device using other cooling methods.

Wherein, the ring cooler (so-called ring cooler) is used for spreading hot materials on a roller way and cooling the hot materials by blowing from the lower part, so that the cooling capacity can be increased; the cooling tower is standard equipment of the lime rotary kiln, and can increase the cooling amount by blowing air from the bottom and the side surface.

The lime shaft kiln system also comprises a heat supply device, a heat exchange device (waste heat recovery system), a dust removal device, a smoke exhaust chimney and the like which are necessary in the prior art so as to normally produce high-activity lime.

In summary, the lime shaft kiln (such as a single-hearth shaft kiln system) of the invention has a preparation process for producing high-activity lime, an independent cooling device is adopted to replace a cooling section of a conventional lime shaft kiln in the prior art, the lime shaft kiln comprises a kiln body and a cooling device, a preheating section and a calcining section are arranged in the kiln body, a heating system, a smoke exhaust system, a feeding mechanism and a discharging mechanism are arranged, the cooling device is relatively independent from the kiln body, cooling air is adopted to cool calcined high-temperature lime, the cooled lime is conveyed to a finished product screening section through a conveying belt, flue gas at the top of the kiln and waste cooling air can be provided with a waste heat utilization system, and the waste cooling air can be used as combustion-supporting air to participate in combustion after dust removal or other waste heat recovery processes are adopted. The beneficial effects obtained are as follows:

1. the lime kiln cools a lime finished product by using an independent cooling device; the kiln body is cancelled with a cooling section, and the calcined lime is discharged into an independent cooling device and is cooled by cooling air.

2. The process is simple and flexible, is convenient to realize quick cooling, improves the lime activity and is also beneficial to improving the yield.

3. The kiln body structure is substantially simplified, the maintenance is convenient, and the system maintenance cost is reduced;

4. the heat supply and the cooling air of the calcining section of the kiln body are isolated, so that the mixing of the cooling air and a heat carrier is avoided, and the production efficiency of the calcining section is improved.

5. Compared with the prior lime shaft kiln technology, the used independent cooling device, such as a vertical cooler, a belt cooler or an annular cooler, can be directly connected with the conveying belt if the belt cooler or the annular cooler is adopted, and does not occupy the field additionally.

6. The structure of the single-chamber lime shaft kiln is simplified, so that the efficiency of the shaft kiln can be improved, and the capacity of the shaft kiln can be improved; the independent cooling device is beneficial to improving the lime activity.

It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.

In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.