CN112595102A

CN112595102A - Lump material pre-firing tunnel kiln

Info

Publication number: CN112595102A
Application number: CN202110068337.6A
Authority: CN
Inventors: 韩景文
Original assignee: Foshan Jingjia Electromechanical Equipment Co ltd
Current assignee: Foshan Jingjia Electromechanical Equipment Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-04-02

Abstract

The invention discloses a material block pre-burning tunnel kiln, which comprises a kiln body, a front kiln door, a rear kiln door, heating burners and a smoke exhaust pipe, wherein the front kiln door is arranged on the front end surface of the kiln body, the rear kiln door is arranged on the rear end surface of the kiln body, a traveling space arranged along the length direction of the kiln body is arranged in the kiln body, the traveling space can be sequentially divided into a heating section for heating and igniting a material block, a self-burning section for self-burning after heating a feeding block and a cooling section for gradually cooling the material block after burning, the heating burners are arranged in the heating section, the smoke exhaust pipe is arranged on the self-burning section and communicated with the self-burning section and the external environment, the heating section, the self-burning section and the cooling section are at least the length of one kiln car respectively, and when one of the front kiln door and the rear kiln door is in an open state. The invention can realize the continuous pre-burning of the stainless steel material block by the structure and can ensure that the smoke can not escape from the front kiln door or the rear kiln door.

Description

Lump material pre-firing tunnel kiln

Technical Field

The invention relates to the technical field of waste treatment, in particular to a block pre-firing tunnel kiln for stainless steel waste treatment.

Background

As is well known, China is a large country for producing stainless steel, and the yield of various stainless steels is huge; meanwhile, a great amount of stainless steel scrap, leftover materials or excess materials and the like are generated in various production and processing industries in China, and the stainless steel scrap, the leftover materials or the excess materials can be recycled uniformly and then put into an intermediate frequency furnace to be cast into steel billets for reuse after being refined and adjusted.

However, the conventional process for treating stainless steel scrap has the following problems: since the stainless steel waste materials come from various regions and industries, the stainless steel material blocks extruded into lumps contain low-melting-point materials such as lead, zinc or aluminum, and combustible materials such as plastic films or rubber are also contained in the surface or internal gaps of the stainless steel material blocks, and if the stainless steel waste materials are directly put into a furnace, the content of elements such as carbon, aluminum, zinc or lead in produced molten steel exceeds the standard, and further the burden is brought to the subsequent purification treatment of the molten steel, so that a plurality of existing stainless steel waste material treatment enterprises can carry out pre-sintering treatment on the recycled stainless steel waste materials, namely, the stainless steel waste materials are ignited to reduce harmful impurities in the stainless steel waste materials.

The existing method for pre-burning the stainless steel waste materials is generally carried out through a kiln, firstly, a kiln car filled with the stainless steel waste materials is pushed into a kiln body for pre-burning, a kiln door is opened after the pre-burning is finished, and the kiln car is pulled out and then put into the next kiln car. The existing treatment method has the following defects: 1. the other kiln car can be pushed in only after the kiln car in one kiln body completely finishes presintering, so that the treatment efficiency is low; 2. when the kiln door is opened, a large amount of VOC-containing gas generated in the pre-burning process of the stainless steel waste can escape from the kiln body through the kiln door, and the harmful gas can cause damage to the body of an operator.

Therefore, there is a need for a lump-pre-fired tunnel kiln which can effectively improve the processing efficiency and prevent harmful gas from escaping from the kiln body to solve the above problems.

Disclosure of Invention

The invention provides a block pre-firing tunnel kiln aiming at the technical defects at present.

The technical scheme adopted by the invention for realizing the purpose is as follows:

a material block pre-burning tunnel kiln comprises a kiln body, a front kiln door, a rear kiln door, a heating burner and a smoke exhaust pipe, wherein the front kiln door is installed on the front end face of the kiln body, the rear kiln door is installed on the rear end face of the kiln body, a traveling space arranged along the length direction of the kiln body is arranged inside the kiln body, the traveling space can be sequentially divided into a heating section for heating and igniting a material block, a spontaneous combustion section for heating a feeding block and then automatically burning the material block, and a cooling section for gradually cooling the material block after burning, the heating burner is installed in the heating section, the smoke exhaust pipe is installed on the spontaneous combustion section and communicated with the spontaneous combustion section and the external environment so that smoke inside the kiln body flows from two ends to the direction of the smoke exhaust pipe, the heating section, the spontaneous combustion section and the cooling section are at least the length of a kiln car respectively, and when one of the front kiln door and the rear kiln door is in an open state, the other is in the off state.

With further improvement, the heating section, the autoignition section and the cooling section are equal in length.

In a further improvement, the smoke exhaust pipe is arranged on the top wall of the middle part of the spontaneous combustion section.

In a further improvement, the spontaneous combustion section is positioned in the middle of the kiln body.

In a further improvement, the heating section, the spontaneous combustion section and the cooling section each occupy one third of the length of the kiln body.

The further improvement is that the block pre-firing tunnel kiln further comprises a traveling rail arranged in the inner space of the kiln body along the length direction of the kiln body and a kiln car used for loading the blocks, wherein the kiln car is arranged on the traveling rail and can slide relative to the traveling rail.

The kiln car comprises a frame and a plurality of support columns which are fixed on the frame and used for ejecting the material block away from the frame, the support columns are arranged at intervals, and the space between every two adjacent support columns arranged along the length direction of the kiln body is the heating space of the heating burner.

The improved high-strength concrete column is characterized in that the support column comprises a high-strength pouring material column, a steel pipe and a steel top plate, the steel pipe is sleeved outside the high-strength pouring material column, the steel top plate is located at the top of the high-strength pouring material column and connected with the steel pipe, and the middle of the steel top plate is provided with a vent hole.

The further improvement is that the block pre-firing tunnel kiln further comprises a controller and a hooking device, the hooking device is located at the bottom of the kiln body, one end of the hooking device extends into the cooling section, the other end of the hooking device extends out of the rear kiln door, and the controller is electrically connected with the hooking device and the rear kiln door to enable a section of kiln car closest to the rear kiln door to be pulled out of the kiln body through the hooking device when the rear kiln door is in an open state.

The improvement is further made, the block pre-burning tunnel kiln further comprises a secondary combustion chamber and a flue gas quencher, wherein the secondary combustion chamber is used for re-burning before the flue gas is discharged, the flue gas quencher is used for rapidly cooling the flue gas, and the secondary combustion chamber is arranged between the flue gas quencher and the smoke exhaust pipe and communicated with the flue gas quencher and the smoke exhaust pipe.

The invention has the beneficial effects that: the invention discloses a block pre-burning tunnel kiln, which comprises a kiln body, a front kiln door, a rear kiln door, a heating burner and a smoke exhaust pipe, wherein the front kiln door is arranged on the front end surface of the kiln body, the rear kiln door is arranged on the rear end surface of the kiln body, a traveling space arranged along the length direction of the kiln body is arranged in the kiln body, the traveling space can be sequentially divided into a heating section for heating and igniting a block, a self-burning section for heating a feeding block and then automatically burning and a cooling section for gradually cooling the block after burning, the heating burner is arranged in the heating section, the smoke exhaust pipe is arranged on the self-burning section and communicated with the self-burning section and the external environment, the heating section, the self-burning section and the cooling section are at least the length of one kiln car respectively, and when one of the front kiln door and the rear kiln door is in an. In the actual production process of the block pre-burning tunnel kiln, the kiln cars which are not pre-burned can be pushed by the front kiln door, and the kiln cars which are pre-burned are pushed out of the rear kiln door, so that uninterrupted continuous pre-burning is realized; at most, only one of the front kiln door and the rear kiln door can be in an open state, so that the increase of the smoke gas quantity in the kiln caused by the fact that external cold air is sucked into the kiln can be effectively reduced; moreover, because the smoke exhaust pipe is communicated with the spontaneous combustion section which is positioned between the heating section and the cooling section, the smoke in the travelling crane space can be pumped away from the spontaneous combustion section, so that all positions in the travelling crane space can be uniformly pumped, and the smoke in the kiln body can not escape from a front kiln door or a rear kiln door.

The invention is further described with reference to the following detailed description and accompanying drawings.

Drawings

FIG. 1 is a schematic view of the overall structure of a block pre-firing tunnel kiln of the present invention;

FIG. 2 is a front view of the block pre-firing tunnel kiln of the present invention;

fig. 3 is a schematic view of the overall structure of the support column of the present invention.

In the figure: 100. the tunnel kiln comprises a material block pre-burning tunnel kiln body 10, a kiln body 20, a front kiln door 30, a rear kiln door 40, heating burners 50, a smoke exhaust pipe 10a, a travelling space 11a, a heating section 12a, a spontaneous combustion section 13a, a cooling section 11, a travelling rail 12, a kiln car 121, a car frame 122, a support column 122a, a heating space 1221, a high-strength pouring material column 1222, a steel pipe 1223, a steel top plate 1223, a ventilation hole 1223a, a car hooking device 70, a car jacking device 80, a transmission chain 71, a hook 72, a smoke treatment device 90, a secondary combustion chamber 91, a smoke quencher 92, a desulfurization and dechlorination device 93, a dust removal cloth bag 60 and an air extraction device.

Detailed Description

The following description is only a preferred embodiment of the present invention, and does not limit the scope of the present invention.

Referring to fig. 1 to 3, a block pre-firing tunnel kiln 100 of the present invention includes a kiln body 10, a front kiln door 20, a rear kiln door 30, a heating burner 40 and a smoke exhaust pipe 50, the front kiln door 20 is installed on a front end surface of the kiln body 10, the rear kiln door 30 is installed on a rear end surface of the kiln body 10, a traveling space 10a arranged along a length direction of the kiln body 10 is provided inside the kiln body 10, the traveling space 10a can be sequentially divided from front to rear into a heating section 11a for heating and igniting a block, a spontaneous combustion section 12a for heating the block and self-combusting the block, and a cooling section 13a for gradually cooling the block after combustion, the heating burner 40 is installed in the heating section 11a, the smoke exhaust pipe 50 is installed on the spontaneous combustion section 12a and communicated with the spontaneous combustion section 12a and an external environment so that smoke inside the kiln body 10 flows from two ends toward the smoke exhaust pipe 50, each of the heating section 11a, the spontaneous combustion section 12a and the cooling section 13a is at least, when one of the front and

rear doors

20 and 30 is opened, the other is closed. For example, the heating section 11a, the spontaneous combustion section 12a and the cooling section 13a have the same length, and the heating section 11a, the spontaneous combustion section 12a and the cooling section 13a each occupy one third of the length of the kiln body 10, that is, the spontaneous combustion section 12a is located at the middle position of the kiln body 10, and at the same time, the smoke exhaust pipe 50 is installed on the top wall of the middle part of the spontaneous combustion section 12 a; therefore, when the air extraction device 60 installed at the smoke exhaust pipe 50 is used for extracting air from the kiln body 10, the air extraction degrees received at the kiln mouth or the kiln tail are the same, so that the situation that the smoke escapes from the kiln mouth or the kiln tail due to insufficient air extraction force is avoided, and the practical operation tests prove that the temperature of the stainless steel block in the heating section 11a can generally reach about 250 ℃, the temperature in the spontaneous combustion section 12a can reach about 750 ℃, the amount of waste gas generated by the stainless steel block in the pre-burning process is the largest, and the generated waste gas can be extracted to the greatest extent from the middle of the spontaneous combustion section 12a. In addition, as a solution with poor smoke discharging effect, in other embodiments, a person skilled in the art may dispose the smoke discharging pipe 50 at other positions except for the middle of the natural section, so the disclosure is not limited thereto.

With continuing reference to fig. 1 and 2, the block pre-firing tunnel kiln 100 further includes a traveling rail 11 disposed in the inner space of the kiln body 10 along the length direction of the kiln body 10, and a kiln car 12 for loading the blocks, the kiln car 12 being mounted on the traveling rail 11 and being slidable with respect to the traveling rail 11. Specifically, the kiln car 12 includes a frame 121 and a plurality of support columns 122 fixed on the frame 121 and used for pushing the material block away from the frame 121, the support columns 122 are arranged at intervals, a space between two adjacent support columns 122 arranged along the length direction of the kiln body 10 is a heating space 122a of the heating burner 40, the heating burner 40 has a plurality of burners, and a burner port of each heating burner 40 is aligned with the heating space 122a. For example, in the present embodiment, each frame 121 may be provided with 24 supporting

pillars

122, and 2 stainless steel blocks are stacked on every 4 supporting pillars 122, but is not limited thereto. More specifically, the support column 122 includes high-strength pouring material column 1221, steel pipe 1222 and steel roof 1223, the steel pipe 1222 is sleeved outside the high-strength pouring material column 1221, the steel roof 1223 is located at the top of the high-strength pouring material column 1221 and is connected with the steel pipe 1222, and an air hole 1223a is formed in the middle of the steel roof 1223, so that powerful support for the stainless steel material block can be realized through the steel pipe 1222 and the steel roof 1223, and the steel pipe 1222 or the steel roof 1223 is supported through the high-strength pouring material column 1221 to prevent the steel pipe 1222 or the steel roof 1223 from being softened at high temperature to cause the displacement of the stainless steel material block. The air holes 1223a formed in the steel top plate 1223 are used for allowing moisture of the high-strength casting material column 1221 to escape during kiln drying. Notably, the high-strength casting used to form the high-strength casting column 1221 is a high-temperature-resistant high-strength casting, such as: the steel fiber high-strength casting material is not limited to this.

With continued reference to fig. 1, the block pre-firing tunnel kiln 100 further includes a controller (not shown) and a hook-and-turn device 70, the hook-and-turn device 70 is located at the bottom of the kiln body 10, one end of the hook-and-turn device 70 extends into the cooling section 13a, the other end of the hook-and-turn device 70 extends out of the rear kiln door 30, and the controller is electrically connected to the hook-and-turn device 70 and the rear kiln door 30 respectively to enable the kiln car 12 closest to the rear kiln door 30 to be pulled out of the kiln body 10 by the hook-and-turn device 70 when the rear kiln door 30 is in an open state. Meanwhile, the block pre-firing tunnel kiln 100 of the present invention further includes a top carriage device 80 for pushing the kiln car 12 into the kiln body 10, the top carriage device 80 is installed outside the kiln body 10, and the top carriage device 80 is located below the kiln body 10, and the top carriage device 80 may be a device commonly used by those skilled in the art for pushing the kiln car into the kiln body 10, and therefore, the description thereof is omitted here. For example, the hook cart device 70 may include a driving device (not shown), a transmission chain 71 and a hook 72, and in actual operation, the driving device drives the hook 72 to hook the bottom of the kiln car 12 via the transmission chain 71 and pull the kiln car 12 out of the kiln body 10, but is not limited thereto. Therefore, in the actual working process, after the kiln cars 12 are pulled out of the kiln body 10 by the hook car device 70, the rear kiln door 30 is closed, then the front kiln door 20 is opened, the new kiln car 12 is pushed into the heating section 11a by the top car device 80 for heating and ignition, and the new kiln car 12 abuts against the other kiln cars 12 in the traveling space 10a, so that all the kiln cars 12 move by the distance of one kiln car 12 in sequence, and the gapless treatment of the pre-burning of the stainless steel material blocks can be realized.

With continued reference to fig. 1, the block pre-firing tunnel kiln 100 further includes a flue gas treatment device 90 for performing secondary combustion and treatment before discharging flue gas, the flue gas treatment device 90 is installed above the kiln body 10, and the smoke discharge pipe 50 communicates the flue gas treatment device 90 and the interior of the kiln body 10. Preferably, the flue gas treatment device 90 is sequentially provided with a secondary combustion chamber 91, a flue gas quencher 92, a desulfurization and dechlorination device 93, a dust removal cloth bag 94 and an air extraction device 60, the temperature of the secondary combustion chamber 91 is maintained above 850 ℃, the flue gas stays in the secondary combustion chamber 91 for more than 2 seconds during actual work treatment, so that unburned VOCS, oil gas and other substances in the flue gas are combusted, the flue gas quencher 92 is arranged to rapidly cool the flue gas from 850 ℃ to 160-180 ℃ in less than 2 seconds, so as to avoid secondary synthesis of dioxin, for example, the flue gas quencher 92 is actually an indirect cooler with normal pressure, the flue gas shell pass, and the cooling water pass, and the flue gas is cooled by utilizing vaporization heat absorption of normal pressure water; in other embodiments, other devices can be provided by those skilled in the art to treat the flue gas, for example, a device capable of spraying a dilute urea solution is installed at the side of the secondary combustion chamber 91 to reduce the content of nitrogen oxides in the flue gas, and is not limited thereto.

It should be noted that the lengths of the heating section 11a, the spontaneous combustion section 12a and the cooling section 13a of the present invention may be the length of two kiln cars or the length of three kiln cars, and therefore, the present invention is not limited to the above embodiment. For example, the heating burner 40 is installed on a side wall of the kiln body 10, but in other embodiments, the heating burner 40 may also be installed on a bottom wall of the kiln body 10, but not limited thereto. In addition, the most preferred embodiment of the present invention is to provide only three sections of spaces in the kiln body 10, namely, a heating section 11a for heating and igniting the material blocks, a spontaneous combustion section 12a for self-combustion after the material blocks are heated, and a cooling section 13a for gradually reducing the temperature of the material blocks under the action of the air extraction device 60 after the material blocks are completely combusted; in the non-optimal embodiment of the present invention, the kiln body 10 may further have other processing spaces respectively disposed at the first and the last ends of the three spaces, but in order to ensure that the air-exhaust quality in the kiln body 10 is good enough, the smoke exhaust pipe 50 should be always located at the middle position of the kiln body 10, and therefore, the description of other non-optimal embodiments is omitted here.

The invention has the beneficial effects that: the block pre-firing tunnel kiln 100 comprises a kiln body 10, a front kiln door 20, a rear kiln door 30, heating burners 40 and a smoke exhaust pipe 50, wherein the front kiln door 20 is installed on the front end face of the kiln body 10, the rear kiln door 30 is installed on the rear end face of the kiln body 10, a traveling space 10a arranged along the length direction of the kiln body 10 is arranged inside the kiln body 10, the traveling space 10a can be sequentially divided into a heating section 11a for heating and igniting a block, a self-ignition section 12a for self-combusting a feeding block after being heated and a cooling section 13a for gradually cooling the block after being combusted, the heating burners 40 are installed in the heating section 11a, the smoke exhaust pipe 50 is installed on the self-ignition section 12a and communicated with the self-ignition section 12a and the external environment, and the heating section 11a, the self-ignition section 12a and the cooling section 13a are at least as long as one kiln car 12, when one of the front and

rear doors

20 and 30 is opened, the other is closed. In the actual production process of the block pre-burning tunnel kiln 100, the kiln cars 12 which are not pre-burned can be pushed by the front kiln door 20, and the kiln cars 12 which are pre-burned are pushed out from the rear kiln door 30, so that uninterrupted continuous pre-burning is realized; at most, only one of the front kiln door 20 and the rear kiln door 30 is in an open state, so that the increase of the smoke gas quantity in the kiln caused by the fact that external cold air is sucked into the kiln can be effectively reduced; moreover, because the smoke exhaust pipe 50 is communicated with the spontaneous combustion section 12a, and the spontaneous combustion section 12a is positioned between the heating section 11a and the cooling section 13a, the smoke in the traveling space 10a can be pumped away from the spontaneous combustion section 12a, so that all positions in the traveling space 10a can be uniformly pumped, and the smoke in the kiln body 10 can be further ensured not to escape from the front kiln door 20 or the rear kiln door 30.

The present invention is not limited to the above embodiments, and other tunnel kilns for lump pre-firing obtained by using the same or similar structures, devices, processes or methods as those of the above embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A kind of material lump pre-combustion tunnel kiln, characterized by: the kiln comprises a kiln body, a front kiln door, a rear kiln door, a heating burner and a smoke exhaust pipe, wherein the front kiln door is installed on the front end face of the kiln body, the rear kiln door is installed on the rear end face of the kiln body, a traveling space arranged along the length direction of the kiln body is arranged in the kiln body, the traveling space can be sequentially divided into a heating section for heating and igniting a material block, a self-ignition section for heating a material supply block and then automatically burning the material block, and a cooling section for gradually cooling the material block after burning, the heating burner is installed in the heating section, the smoke exhaust pipe is installed on the self-ignition section and communicated with the self-ignition section and the external environment so that smoke in the kiln body flows from two ends to the direction of the smoke exhaust pipe, the heating section, the self-ignition section and the cooling section are at least the length of one kiln car, and when one of the front kiln door and the rear kiln door is in an open state, the other is in the off state.

2. The block pre-firing tunnel kiln of claim 1, wherein: the heating section, the autoignition section and the cooling section are equal in length.

3. The block pre-firing tunnel kiln of claim 2, wherein: the smoke exhaust pipe is arranged on the top wall of the middle part of the spontaneous combustion section.

4. The block pre-firing tunnel kiln of claim 3, wherein: the spontaneous combustion section is located in the middle of the kiln body.

5. The block pre-firing tunnel kiln of claim 4, wherein: the heating section, the spontaneous combustion section and the cooling section respectively occupy one third of the length of the kiln body.

6. The block pre-firing tunnel kiln of claim 1, wherein: the kiln body is characterized by further comprising a traveling track arranged in the inner space of the kiln body and a kiln car used for loading material blocks, wherein the kiln car is arranged on the traveling track and can slide relative to the traveling track.

7. The block pre-firing tunnel kiln of claim 6, wherein: the kiln car includes the frame and is fixed in be used for on the frame with the material piece liftoff a plurality of support column of frame, the support column is arranged with being the interval each other, and follows the space between two adjacent support columns that the length direction of the kiln body arranged is the heating space of heating nozzle.

8. The block pre-firing tunnel kiln of claim 7, wherein: the support column comprises a high-strength pouring material column, a steel pipe and a steel top plate, the steel pipe is sleeved outside the high-strength pouring material column, the steel top plate is located at the top of the high-strength pouring material column and connected with the steel pipe, and the middle of the steel top plate is provided with a vent hole.

9. The block pre-firing tunnel kiln of claim 1, wherein: still include controller and hook car device, hook car device is located the bottom of the kiln body, just the one end of hook car device stretches into the cooling section, the other end of hook car device stretches out back kiln door, the controller respectively with hook car device and back kiln door electricity is connected in order to realize working as back kiln door is when opening the state through hook car device will be closest to a section kiln car of back kiln door drags out the kiln body.

10. The block pre-firing tunnel kiln of claim 1, wherein: still including being used for carrying on the second combustion chamber of burning once more before the fume emission and carrying out the flue gas quencher of rapid cooling to the flue gas, second combustion chamber set up in flue gas quencher with discharge fume and between the pipe and link to each other the two.