阅读说明：本技术 废旧镁碳砖水化、除杂、干燥一体化热处理装置及方法 (Hydration, impurity removal and drying integrated heat treatment device and method for waste magnesia carbon bricks ) 是由 姚苏哲 王海波 刘杰 杨耕桃 于 2020-07-30 设计创作，主要内容包括：本发明涉及一种废旧镁碳砖水化、除杂、干燥一体化热处理装置及方法,所述装置包括准备室、窑体、窑门、送风管道、排风管道、装料罐、窑车、轨道、地下推车机；窑体由窑壳、隔热材料层及钢板网组成,窑体内设送风管道及排风管道；窑体设有窑体入口和窑体出口,窑体入口一端与准备室相连；窑体底部铺设轨道,窑车和地下推车机能够沿轨道走行移动。本发明所述装置具备对废旧镁碳砖进行水化除杂和干燥一体化处理的功能,大大提高了处理工艺的集成度,废旧镁碳砖的处理时间大大缩短,并减少了占地；热处理过程中废旧镁碳砖基本保持静态,避免了扬尘及噪声污染；热处理过程中产生的有害气体可以进行收集处理及利用,进一步避免环境污染、节约能源。(The invention relates to a hydration, impurity removal and drying integrated heat treatment device and a method for waste magnesia carbon bricks, wherein the device comprises a preparation chamber, a kiln body, a kiln door, an air supply pipeline, an exhaust pipeline, a charging tank, a kiln car, a track and an underground car pusher; the kiln body consists of a kiln shell, a heat insulation material layer and a steel plate net, and an air supply pipeline and an air exhaust pipeline are arranged in the kiln body; the kiln body is provided with a kiln body inlet and a kiln body outlet, and one end of the kiln body inlet is connected with the preparation chamber; the track is laid at the bottom of the kiln body, and the kiln car and the underground car pusher can move along the track. The device has the function of carrying out hydration, impurity removal and drying integrated treatment on the waste magnesia carbon bricks, greatly improves the integration level of the treatment process, greatly shortens the treatment time of the waste magnesia carbon bricks, and reduces the occupied land; the waste magnesia carbon bricks are basically kept static in the heat treatment process, so that dust emission and noise pollution are avoided; harmful gas generated in the heat treatment process can be collected, treated and utilized, so that the environmental pollution is further avoided, and the energy is saved.)

1. The integrated heat treatment device for hydration, impurity removal and drying of the waste magnesia carbon bricks is characterized by comprising a preparation chamber, a kiln body, a kiln door, an air supply pipeline, an exhaust pipeline, a charging tank, a kiln car, a rail and an underground car pusher; the kiln body is divided into a plurality of sections which are connected in sequence; each section of kiln body consists of a kiln shell, a heat insulation material layer and a steel plate net which are sequentially arranged from outside to inside, and one or more air supply pipelines and exhaust pipelines are arranged in the kiln body; a first temperature monitoring device, a first pressure monitoring device and a first flow monitoring device are mounted on the air supply pipeline; a second temperature monitoring device is arranged on the exhaust pipeline; a plurality of temperature monitoring devices III and pressure monitoring devices III are arranged in the kiln body; one end of the kiln body is provided with a kiln body inlet, the other end of the kiln body is provided with a kiln body outlet, one end of the kiln body inlet is connected with the preparation chamber, the outer end of the preparation chamber is provided with an inlet kiln door, the kiln body inlet is provided with a middle kiln door, and the kiln body outlet is provided with an outlet kiln door; a track is laid at the bottom of the kiln body from one end of the inlet of the kiln body to one end of the outlet of the kiln body, the kiln car can move along the track in a walking mode, an underground car pusher is arranged on the outer side of the preparation chamber, and the underground car pusher can also move along the track in a walking mode.

2. The integrated heat treatment device for hydration, impurity removal and drying of waste magnesia carbon bricks according to claim 1, wherein a plurality of hook nails are arranged on the inner side of the kiln shell, one ends of the hook nails are welded and fixed with the kiln shell, and the other ends of the hook nails penetrate through the heat insulation material layer and then are welded and fixed with the steel plate mesh.

3. The integrated hydration, impurity removal and drying heat treatment device for the waste magnesia carbon bricks according to claim 1 or 2, wherein the heat insulation material layer is composed of a plurality of rock wool boards, and the adjacent 2 rock wool boards are in staggered joint overlapping.

4. The integrated hydration, impurity removal and drying heat treatment device for the waste magnesia carbon bricks according to claim 1 or 2, wherein a clay brick platform is built at the lower part of the heat insulation material layer, and slag fillers or slag fragments are filled at the outer side of the clay brick platform.

5. The integrated hydration, impurity removal and drying heat treatment device for the waste magnesia carbon bricks according to claim 1, wherein the air supply pipeline and the air exhaust pipeline are erected on a clay brick platform and are fixedly connected with angle steel or channel steel welded on a kiln body.

6. The integrated heat treatment device for hydration, impurity removal and drying of waste magnesia carbon bricks according to claim 1, wherein the kiln shell is made of a metal material.

7. The integrated heat treatment device for hydration, impurity removal and drying of waste magnesia carbon bricks according to claim 1, wherein organic side operation switches are arranged at one sides of the inlet kiln door, the middle kiln door and the outlet kiln door.

8. The integrated waste magnesia carbon brick hydration, impurity removal and drying heat treatment device according to claim 1, wherein expansion gaps of 1-10 mm are arranged at the joints of the sections of the kiln bodies and the joints of the preparation chamber or the kiln bodies and the kiln doors; the expansion joint is filled with asbestos ropes.

9. The integrated hydration, impurity removal and drying heat treatment device for the waste magnesia carbon bricks according to claim 1, wherein an air inlet of the air supply pipeline is connected to a heat-resistant blower through which hot air is introduced, and an air outlet of the air exhaust pipeline is sequentially connected with a heat-resistant smoke exhaust fan, a smoke treatment device and a chimney.

10. The integrated heat treatment method for hydration, impurity removal and drying of waste magnesia carbon bricks by adopting the device as claimed in any one of claims 1 to 9 is characterized by comprising the following steps:

1) putting the waste magnesia carbon brick particles which have a set particle size range and are subjected to water wet mixing into a charging tank, and putting the charging tank on a kiln car; the particle size of the waste magnesia carbon brick particles is 0-15 mm, and the water addition amount is 3-20% by volume ratio;

2) opening an inlet kiln door, pushing a kiln car into the preparation chamber through an underground car pusher, and then closing the inlet kiln door;

3) after delaying for a period of time, opening the middle kiln door, pushing the kiln car in the preparation room into the first section of kiln body through the underground car pusher, and then closing the middle kiln door;

4) repeating the step 2) and the step 3), and sequentially pushing all the kiln cars into the kiln body;

5) the kiln car in the kiln body moves to one end of the outlet kiln door along the track, and the advancing direction of the kiln car and the flowing direction of hot air in the kiln body are in a counter-current state; the heat treatment process in the kiln body is divided into a front section and a rear section by controlling the temperature in each section of the kiln body, wherein the front section is a hydration impurity removal process, and the rear section is a drying process; controlling the treatment duration of the waste magnesia carbon brick particles in the two-stage heat treatment process by controlling the air volume and the temperature of an air inlet pipeline and an air outlet pipeline in the corresponding kiln body and simultaneously adjusting the cart interval time of a kiln car; wherein the treatment time of the hydration impurity removal process is 24-48 h, and the temperature of high-temperature flue gas introduced into the kiln body through an air inlet pipeline is 100-150 ℃; the treatment time in the drying process is 10-24 hours, and the temperature of high-temperature flue gas introduced into the kiln body through an air inlet pipeline is 150-300 ℃ correspondingly; flue gas exhausted by the exhaust pipeline is subjected to unified treatment and waste heat recycling by a flue gas treatment device;

6) after the heat treatment process of the waste magnesia carbon brick particles is finished, opening the middle kiln door and the outlet kiln door, pushing the kiln car closest to the outlet kiln door out of the kiln body by the underground car pusher in a forward movement mode, and then closing the outlet kiln door and the middle kiln door;

7) opening an inlet kiln door, pushing a subsequent kiln car into a preparation room by an underground car pusher, and closing the inlet kiln door;

8) and (5) repeating the step 6) and the step 7) until the heat treatment process of the waste magnesia carbon brick particles is completely finished.

Technical Field

The invention relates to the technical field of refractory material heat treatment, in particular to a hydration, impurity removal and drying integrated heat treatment device and method for waste magnesia carbon bricks.

Background

The magnesia carbon brick is a refractory material which is formed in the 70 th century, is used as a composite material, combines the advantage of strong slag corrosion resistance of magnesia with the characteristics of high thermal conductivity and low expansibility of carbon, has good use effect, and is widely applied to the steel smelting industry all the time.

Along with the gradual decrease of magnesium ore resources and the gradual deepening of environmental awareness in recent years, the recycling of waste magnesia carbon bricks is emphasized by people. The metal aluminum powder is one of the most commonly used additives of the magnesia carbon brick, and can react to generate Al in the using process of the magnesia carbon brick₄C₃And a small amount of AlN, wherein the components can generate hydration reaction when meeting water to generate gas such as methane, ammonia gas and the like, so that the recycled refractory material product is subjected to expansion crack or even pulverization, and therefore, the waste magnesia carbon brick needs to be subjected to hydration treatment in the recycling treatment process to remove impurity components in advance and is fully dried.

The traditional recovery treatment process of the waste magnesia carbon bricks mainly comprises the steps of hydrating waste materials at normal temperature and naturally airing and drying the waste materials, but the waste magnesia carbon bricks are obviously influenced by seasonal changes and have longer treatment time, and impurities in the waste magnesia carbon bricks are not completely treated due to lower natural drying temperature, so that capillary cracks appear after the manufactured regenerated magnesia carbon bricks are dried. In addition, most of the methane, ammonia gas and other gases generated in the airing process are naturally discharged, so that the environment is polluted, resources are wasted, and certain health hazards are brought to operators. In view of the defects of the natural airing process, some enterprises adopt drum-type drying equipment to dry waste bricks, such as a drying drum, a rotary drying kiln and the like, but the problems of dust leakage and pollution and noise are easily caused by large-amplitude movement of materials in the treatment process of the equipment, and the drum structure is relatively complex, the maintenance cost is high, and the power consumption is high. The most important is that the drying equipment can only dry materials, the hydration of the waste bricks still needs to be treated separately in advance, the process integration level is not high, and the efficiency is low.

Disclosure of Invention

The invention provides a hydration, impurity removal and drying integrated heat treatment device and method for waste magnesia carbon bricks, which have the functions of hydration, impurity removal and drying integrated treatment of the waste magnesia carbon bricks, greatly improve the integration level of the treatment process, greatly shorten the treatment time of the waste magnesia carbon bricks, and effectively reduce the occupied land; the waste magnesia carbon bricks are basically kept static in the heat treatment process, so that dust emission and noise pollution are avoided; and harmful gases generated in the heat treatment process can be collected, treated and utilized, so that the environmental pollution is further avoided, and the energy is saved.

In order to achieve the purpose, the invention adopts the following technical scheme:

the integrated heat treatment device for hydration, impurity removal and drying of the waste magnesia carbon bricks comprises a preparation chamber, a kiln body, a kiln door, an air supply pipeline, an exhaust pipeline, a charging tank, a kiln car, a track and an underground car pusher; the kiln body is divided into a plurality of sections which are connected in sequence; each section of kiln body consists of a kiln shell, a heat insulation material layer and a steel plate net which are sequentially arranged from outside to inside, and one or more air supply pipelines and exhaust pipelines are arranged in the kiln body; a first temperature monitoring device, a first pressure monitoring device and a first flow monitoring device are mounted on the air supply pipeline; a second temperature monitoring device is arranged on the exhaust pipeline; a plurality of temperature monitoring devices III and pressure monitoring devices III are arranged in the kiln body; one end of the kiln body is provided with a kiln body inlet, the other end of the kiln body is provided with a kiln body outlet, one end of the feed inlet is connected with the preparation chamber, the outer end of the preparation chamber is provided with an inlet kiln door, the feed inlet is provided with a middle kiln door, and the kiln body outlet is provided with an outlet kiln door; a track is laid at the bottom of the kiln body from one end of the feeding hole to one end of the kiln body outlet, the kiln car can move along the track in a walking mode, an underground car pusher is arranged on the outer side of the preparation chamber, and the underground car pusher can also move along the track in a walking mode.

And a plurality of hook nails are arranged on the inner side of the kiln shell, one ends of the hook nails are welded and fixed with the kiln shell, and the other ends of the hook nails penetrate through the heat insulation material layer and then are welded and fixed with the steel plate mesh.

The heat insulation material layer is composed of a plurality of rock wool boards, and the rock wool boards in the adjacent 2 layers are in staggered joint and lap joint.

And a clay brick platform is built at the lower part of the heat insulation material layer, and slag filler or slag fragments are filled outside the clay brick platform.

The air supply pipeline and the air exhaust pipeline are erected on the clay brick platform and are fixedly connected with angle steel or channel steel welded on the kiln body.

The kiln shell is made of metal materials.

And organic side operating switches are arranged beside the inlet kiln door, the middle kiln door and the outlet kiln door.

1-10 mm expansion gaps are arranged at the joints of the sections of the kiln bodies and the joints of the preparation chamber or the kiln bodies and the kiln doors; the expansion joint is filled with asbestos ropes.

The air inlet of the air supply pipeline is connected to a heat-resistant blower communicated with hot air, and the air outlet of the air exhaust pipeline is sequentially connected with a heat-resistant smoke exhaust fan, a smoke treatment device and a chimney.

The waste magnesia carbon brick hydration, impurity removal and drying integrated heat treatment method adopting the device comprises the following steps:

1) putting the waste magnesia carbon brick particles which have a set particle size range and are subjected to water wet mixing into a charging tank, and putting the charging tank on a kiln car; the particle size of the waste magnesia carbon brick particles is 0-15 mm, and the water addition amount is 3-20% by volume ratio;

2) opening an inlet kiln door, pushing a kiln car into the preparation chamber through an underground car pusher, and then closing the inlet kiln door;

3) after delaying for a period of time, opening the middle kiln door, pushing the kiln car in the preparation room into the first section of kiln body through the underground car pusher, and then closing the middle kiln door;

4) repeating the step 2) and the step 3), and sequentially pushing all the kiln cars into the kiln body;

5) the kiln car in the kiln body moves to one end of the outlet kiln door along the track, and the advancing direction of the kiln car and the flowing direction of hot air in the kiln body are in a counter-current state; the heat treatment process in the kiln body is divided into a front section and a rear section by controlling the temperature in each section of the kiln body, wherein the front section is a hydration impurity removal process, and the rear section is a drying process; controlling the treatment duration of the waste magnesia carbon brick particles in the two-stage heat treatment process by controlling the air volume and the temperature of an air inlet pipeline and an air outlet pipeline in the corresponding kiln body and simultaneously adjusting the cart interval time of a kiln car; wherein the treatment time of the hydration impurity removal process is 24-48 h, and the temperature of high-temperature flue gas introduced into the kiln body through an air inlet pipeline is 100-150 ℃; the treatment time in the drying process is 10-24 hours, and the temperature of high-temperature flue gas introduced into the kiln body through an air inlet pipeline is 150-300 ℃ correspondingly; flue gas exhausted by the exhaust pipeline is subjected to unified treatment and waste heat recycling by a flue gas treatment device;

6) after the heat treatment process of the waste magnesia carbon brick particles is finished, opening the middle kiln door and the outlet kiln door, pushing the kiln car closest to the outlet kiln door out of the kiln body by the underground car pusher in a forward movement mode, and then closing the outlet kiln door and the middle kiln door;

7) opening an inlet kiln door, pushing a subsequent kiln car into a preparation room by an underground car pusher, and closing the inlet kiln door;

8) and (5) repeating the step 6) and the step 7) until the heat treatment process of the waste magnesia carbon brick particles is completely finished.

Compared with the prior art, the invention has the beneficial effects that:

1) the device has the functions of hydration, impurity removal and drying of the waste magnesia carbon bricks, and is high in process integration level and simple to operate;

2) when the device works, materials do not move to a large extent, so that the whole process of the waste bricks is basically kept static, and dust and noise pollution is effectively avoided;

3) the movement direction of hot air in the device of the invention and the advancing direction of the waste magnesia carbon bricks flow in a reverse direction, the generated step-shaped temperature distribution meets the requirements of different stages of heat treatment, and the heat utilization rate is high;

4) the gas generated in the heat treatment process can be collected and treated or utilized in a centralized way, so that the environmental pollution is avoided, and the energy is saved;

5) the method greatly reduces the treatment time of the waste magnesia carbon bricks, and shortens the time of 7-10 days originally needed by natural airing to be within 3 days; and the waste magnesia carbon bricks are loaded by a kiln car, so that the occupied area is effectively reduced;

6) the device has simple structure, convenient operation and convenient maintenance;

7) the outlet temperature of the exhaust duct in the device is about 100 ℃, and the waste heat can be recycled.

Drawings

FIG. 1 is a schematic view of the structure of an apparatus according to an embodiment of the present invention (front half of the apparatus).

Fig. 2 is a schematic structural view (rear half of the apparatus) of the apparatus according to the embodiment of the present invention.

Fig. 3 is a sectional view taken along line a-a in fig. 1.

Fig. 4 is a sectional view taken along line B-B in fig. 1.

Fig. 5 is a cross-sectional view taken along line C-C in fig. 1.

Fig. 6 is an enlarged view of a portion I in fig. 1.

Fig. 7 is an enlarged view of a portion II in fig. 3.

In the figure, 1, a preparation chamber 2, a kiln body 3, a kiln shell 4a, an inlet kiln door 4b, an intermediate kiln door 4c, an outlet kiln door 5, an air supply pipeline 6, an air exhaust pipeline 7, a heat insulation material layer 8, a steel plate net 9, hook nails 10, a clay brick platform 11, slag filler or slag fragment 12, bolts 13, a temperature monitoring device/pressure monitoring device 14, a kiln car 15 and a track

Detailed Description

The following further describes embodiments of the present invention with reference to the accompanying drawings:

as shown in fig. 1-5, the integrated heat treatment device for hydration, impurity removal and drying of waste magnesia carbon bricks comprises a preparation chamber 1, a kiln body 2, a kiln door, an air supply pipeline 5, an exhaust pipeline 6, a charging tank, a kiln car 14, a track 15 and an underground car pusher; the kiln body 2 is divided into a plurality of sections, and the plurality of sections of kiln bodies 2 are connected in sequence; each section of kiln body 2 consists of a kiln shell 3, a heat insulation material layer 7 and a steel plate mesh 8 (shown in figure 6) which are sequentially arranged from outside to inside, and one or more air supply pipelines 5 and exhaust pipelines 6 are arranged in the kiln body 2; a first temperature monitoring device, a first pressure monitoring device and a first flow monitoring device are mounted on the air supply pipeline 5; a second temperature monitoring device is arranged on the exhaust pipeline 6; a plurality of temperature monitoring devices III and pressure monitoring devices III are arranged in the kiln body 2; one end of the kiln body is provided with a kiln body inlet, the other end of the kiln body is provided with a kiln body outlet, one end of the kiln body inlet is connected with the preparation chamber 1, the outer end of the preparation chamber 1 is provided with an inlet kiln door 4a, the kiln body inlet is provided with a middle kiln door 4b, and the kiln body outlet is provided with an outlet kiln door 4 c; a rail 15 is laid at the bottom of the kiln body 2 from one end of the inlet of the kiln body to one end of the outlet of the kiln body, the kiln car 14 can move along the rail 15 in a walking mode, an underground car pusher is arranged on the outer side of the preparation chamber, and the underground car pusher can also move along the rail 15 in a walking mode.

As shown in fig. 7, a plurality of hook nails 9 are arranged on the inner side of the kiln shell 3, one ends of the hook nails 9 are welded and fixed with the kiln shell 3, and the other ends of the hook nails 9 penetrate through the heat insulation material layer 7 and then are welded and fixed with the steel plate mesh 8.

The heat insulation material layer 7 is composed of a plurality of rock wool boards, and the rock wool boards in the adjacent 2 layers are in staggered joint lap joint.

The lower part of the heat insulation material layer 7 is provided with a clay brick platform 10, and the outer side of the clay brick platform 10 is filled with slag filler or slag fragments 11.

The air supply pipeline 5 and the air exhaust pipeline 6 are erected on a clay brick platform 10 and are fixedly connected with angle steel or channel steel welded on the kiln body 2.

The kiln shell 3 is made of metal materials.

And organic side operation switches are arranged on one sides of the inlet kiln door 4a, the middle kiln door 4b and the outlet kiln door 4c.

1-10 mm expansion gaps are arranged at the joints of the sections of the kiln bodies 2 and the joints of the preparation chamber 1 or the kiln bodies 2 and the kiln doors; the expansion joint is filled with asbestos ropes.

The air inlet of the air supply pipeline 5 is connected with a heat-resistant blower communicated with hot air, and the air outlet of the exhaust pipeline 6 is sequentially connected with a heat-resistant exhaust fan, a smoke treatment device and a chimney.

The integrated heat treatment method for hydrating, impurity removing and drying the waste magnesia carbon bricks by adopting the device comprises the following steps:

1) putting the waste magnesia carbon brick particles with the set particle size range and after being mixed by adding water and wet into a charging tank, and putting the charging tank on a kiln car 14; the particle size of the waste magnesia carbon brick particles is 0-15 mm, and the water addition amount is 3-20% by volume ratio;

2) opening an inlet kiln door 4a, pushing a kiln car 14 into the preparation chamber 1 through an underground car pusher, and then closing the inlet kiln door 4 a;

3) after delaying for a period of time, opening the middle kiln door 4b, pushing the kiln car 14 in the preparation chamber 1 into the first-stage kiln body through an underground car pusher, and then closing the middle kiln door 4 b;

4) repeating the step 2) and the step 3), and sequentially pushing all the kiln cars 14 into the kiln body 2;

5) the kiln car 14 in the kiln body 2 moves to one end of the outlet kiln door 4c along the track 15, and the advancing direction of the kiln car and the flowing direction of hot air in the kiln body 2 are in a counter-current state; the heat treatment process in the kiln body 2 is divided into a front section and a rear section by controlling the temperature in each section of the kiln body 2, wherein the front section is a hydration impurity removal process, and the rear section is a drying process; the treatment duration of the waste magnesia carbon brick particles in the two-stage heat treatment process is controlled by controlling the air volume and the temperature of an air inlet pipeline 5 and an air outlet pipeline 6 in a corresponding kiln body 2 and simultaneously adjusting the cart interval time of a kiln cart 14; wherein the treatment time of the hydration impurity removal process is 24-48 h, and the temperature of high-temperature flue gas introduced into the kiln body through the air inlet pipeline 5 is 100-150 ℃; the treatment time in the drying process is 10-24 hours, and the temperature of high-temperature flue gas introduced into the kiln body through the air inlet pipeline 5 is 150-300 ℃; the flue gas exhausted by the exhaust duct 6 is subjected to unified treatment and waste heat recycling by a flue gas treatment device;

6) after the heat treatment process of the waste magnesia carbon brick particles is finished, opening the middle kiln door 4b and the outlet kiln door 4c, moving the underground car pusher forwards to push the kiln car 14 closest to the outlet kiln door 4c out of the kiln body 2, and then closing the outlet kiln door 4c and the middle kiln door 4 b;

7) opening the inlet kiln door 4a, pushing a subsequent kiln car 14 into the preparation chamber 1 by the underground car pusher, and closing the inlet kiln door 4 a;

8) and (5) repeating the step 6) and the step 7) until the heat treatment process of the waste magnesia carbon brick particles is completely finished.

The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.