CN114806604B

CN114806604B - Continuous combustion carbonization furnace

Info

Publication number: CN114806604B
Application number: CN202210497625.8A
Authority: CN
Inventors: 沈建平; 沈梦佳; 钟哲科
Original assignee: Zhejiang Huateng Animal Husbandry Ltd
Current assignee: Zhejiang Huateng Animal Husbandry Ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2023-02-17
Anticipated expiration: 2042-05-09
Also published as: CN114806604A

Abstract

The invention relates to a continuous combustion carbonization furnace, which solves the problems that the existing agricultural carbonization equipment cannot meet the consumption of agricultural wastes in fields and the use requirements of returning carbonized materials to fields. The device is characterized in that a conveying screw rod conveyed from front to back is arranged on a rack, a screw rod sleeve is arranged on the outer side of the conveying screw rod, the screw rod sleeve is sequentially arranged into a feeding section, a hearth section and a cooling section in a segmented mode, the upper wall of the feeding section is provided with an opening and connected with a feeding hopper, and the upper wall of the screw rod sleeve behind the feeding hopper is provided with an ignition port; the upper wall of the hearth section is opened and covered with a hearth; the upper part, the lower part, the left part and the right part of the cooling section are sealed, and the rear end is a discharge hole; the top of furnace is connected with the exhaust pipe, the exhaust pipe is connected with the water curtain dust remover, and the delivery port of water curtain dust remover sets up in the top of cooling zone discharge gate. The invention adopts the combustion carbonization integrated hearth to carry out carbonization treatment on agricultural wastes and solves the problem that the flue gas and the carbon monoxide in the emission exceed the standard; the device is particularly suitable for the carbonization of agricultural wastes such as field ground straws and the like.

Description

Continuous combustion carbonization furnace

Technical Field

The invention belongs to the field of agricultural equipment, relates to a carbonization furnace, and particularly relates to a continuous combustion carbonization furnace.

Background

In the agricultural field, straws, branches, powder and the like of plants can become wastes in the operation process, the agricultural wastes are subjected to landfill or incineration treatment, and the wastes need a proper place for landfill; in addition, the direct incineration of agricultural wastes, such as straw, causes environmental pollution due to exhaust emission, and biomass in the agricultural wastes is not effectively utilized in landfill or incineration treatment, but has negative impact on the environment.

The agricultural wastes can be made into biochar after carbonization, the biochar with higher purity can be used as commercial carbon, and the carbonized substance with lower purity can be directly returned to the field to improve soil quality, and can also be used as a component of agricultural fertilizer. Present agricultural waste's retort is mostly discontinuous retort, and discontinuous feeding, discontinuous play charcoal promptly scatter and disappear in a large number at the in-process heat that this furnace opened and shut, and furnace's heating and cooling are long consuming time moreover, and is inefficient. At present, a continuous carbonization furnace is also available, and materials are continuously conveyed in a high-temperature and anaerobic environment for a long time to realize continuous carbonization, for example, biochar extruded and processed by a screw rod with the Chinese patent application number of 201810866400.9 and a preparation method thereof, and an anti-caking continuous carbonization furnace with the Chinese patent application number of 201310047977.4 are pushed by helical blades in a conveying channel or fall by self weight, and agricultural wastes such as straws and the like are light materials, and can be caked on furnace walls and helical blades in a carbonization process to cause blockage. There are some carbonization furnaces which adopt modes of vibration, scraping and the like to reduce carbonization agglomeration, and the structure of the carbonization furnaces is more complicated and cannot be applied in fields with low cost.

And the existing continuous carbonization furnace generally needs to be heated by adopting extra fuel as agricultural equipment, the fuel carrying difficulty is high for the use scene of farmers on the field, if the carbonization requirements of the agricultural wastes such as straws of the farmers on the field are further considered, the straws need to be treated, the final carbonization products of the agricultural wastes such as the straws are directly returned to the field to improve the soil quality, and the carbonization rate requirement of the products is low, so that the carbonization requirements of the field on the straws can be met by using the existing conditions to consume and use the straws and generating the proper carbonization products returned to the field.

Disclosure of Invention

The invention aims to solve the problems that the existing agricultural carbonization equipment cannot meet the consumption of agricultural wastes in the field and the use requirement of returning carbonized materials to the field, and provides a continuous combustion carbonization furnace.

The invention adopts a technical scheme for solving the technical problems that: a continuous combustion carbonization furnace comprises a frame, wherein a conveying screw rod conveyed from front to back is arranged on the frame, a screw rod sleeve is arranged on the outer side of the conveying screw rod, the screw rod sleeve is sequentially and sectionally arranged into a feeding section, one or more sections of hearth sections and a cooling section from front to back, the upper wall of the feeding section of the screw rod sleeve is opened and connected with a feeding hopper, and an ignition port is formed in the upper wall of the screw rod sleeve behind the feeding hopper; the upper wall of the hearth section of the screw rod sleeve is provided with an opening and is covered with a hearth; the cooling section is sealed from top to bottom, left and right, and the rear end of the cooling section is a discharge hole; the top of furnace is connected with the exhaust pipe, the exhaust pipe is connected with the water curtain dust remover, and the water curtain dust remover air outlet is connected with the chimney through the fan of airing exhaust, and the rear end of cooling zone or the top that sets up in the cooling zone discharge gate are connected to the delivery port of water curtain dust remover.

The device takes crop straws as agricultural waste materials for explanation, in the device, the conveying screw conveys the straws from the front to the back, a screw sleeve can be square or round, the straws are discharged from a discharging hopper to a feeding section of the conveying screw, the conveying screw conveys the straws backwards, the straws are ignited at an ignition port and are continuously conveyed to a hearth section, the screw sleeve conducts primary air inlet combustion as the bottom of the hearth at the moment, the straws which are combusted at regular time enter a cooling section, the cooling section is sealed and insulated from oxygen circumferentially, open fire can be extinguished, the effect of carbon smothering by waste heat is utilized, the carbonization proportion is improved, discharging is finally carried out from a discharging port, exhaust of the hearth section discharges tail gas after passing through a water curtain dust remover, a water source of the water curtain dust remover can adopt a water pump to take water nearby in the field, a water tank can be arranged on a rack to carry water, discharged water drops of the water curtain dust remover fall into discharged products of the discharging port, the open fire can be further cooled and extinguished, re-ignition is prevented, and the final discharged products can not be returned to the field or used for fertilizer batching. In the scheme, the burning and carbonization of the straws are synchronously carried out in the conveying process, the straws are partially burnt, partially carbonized and partially remained, the carbonization proportion can be adjusted within a range through the conveying speed of the conveying screw, and the carbon content of the final discharging product can reach 10-50%. Although the carbon content of the final product is not high, the final product meets the requirements of returning to the field or the most fertilizer formula, the device has a simple structure and low cost, the carbonized raw materials are visible anywhere in the field, and the raw materials are wastes such as straws and the like which are expected to be treated by farmers, so that pollution and potential safety hazards caused by direct stacking and burning of the straws are avoided, and the collection and transportation cost for packaging, collecting and utilizing the straws is also avoided.

Preferably, the conveying screw includes a screw shaft and a helical blade, and the pitch of the helical blade increases gradually from front to back; conveying screw includes preceding screw rod section, well screw rod section, back screw rod section, and preceding screw rod section, well screw rod section, back screw rod section helical blade interval increase in proper order, and the handing-over department of preceding screw rod section and well screw rod section sets up between feeder hopper and ignition gate, and well screw rod section and back screw rod section handing-over department set up at the rear portion that leans on back furnace section most. Conveying screw adopts the design that the multistage increases the helical blade interval gradually, and when adopting the hopper feeding, the material that is full of the folding between adjacent helical blade reduces the butt joint height because the increase of helical blade interval, makes things convenient for subsequent transport, ignition, also reduces the material height of furnace bottom, avoids a large amount of materials to be blown up by the air inlet once. The material that gets into the cooling zone through furnace highly reduces after the burning, after the helical blade interval further increases, and the flatly is spread in helical blade's bottom, both reduced the adhesion, shakeouts the material again and reduces thickness, makes the even carbomorphism of material in the cooling zone, and reduces the ejection of compact thickness of discharge gate, reduces the inside flash of fire of material and reburns.

Preferably, the lower side of the hearth section of the screw sleeve and the lower parts of the left side and the right side of the hearth section are provided with air inlet clamping sleeves, the air inlet clamping sleeves are connected with primary air inlet fans, and air inlet holes are uniformly formed in the side walls of the hearth sections corresponding to the air inlet clamping sleeves. The air inlet jacket carries out primary air inlet to the bottom of the hearth, and the material is combusted.

Preferably, a lower hearth, an upper hearth and a top cover are sequentially stacked above the hearth section of the screw sleeve, a filter screen is arranged between the lower hearth and the upper hearth, and a filter screen is arranged between the upper hearth and the top cover; a secondary air inlet pipe is arranged at the lower part of the upper hearth or in the lower hearth in a penetrating manner, secondary air inlet holes are uniformly formed in the secondary air inlet pipe, and the secondary air inlet pipe is connected with a secondary air inlet fan; the top surface of the top cover is provided with an air outlet connected with an exhaust pipe. Because the fuel in the screw rod sleeve is sufficient, and the final product is a mixture of ash-carbon-straw, and is used for returning to the field, the combustion at the bottom of the hearth inevitably has the phenomenon of insufficient combustion, a large amount of fly ash, combustible floating objects and carbon monoxide can be generated to enter the upper part of the hearth, the average size of the combustible floating objects is larger than that of the fly ash, the combustible floating objects are hung on a filter screen to continue combustion in the lifting process, and at the moment, because the ascending airflow is used for combustion supporting at the bottom of the hearth, the oxygen concentration is insufficient, and the carbon monoxide can also be generated by the combustion on the filter screen. The fly ash and carbon monoxide are generated in a large amount in straw combustion, and direct discharge can pollute the environment, which is also a main pollutant for burning the traditional straw stacked in the field. In this scheme, furnace or last furnace's bottom sets up the secondary air-supply line down, carry out the secondary air in the position that is higher than furnace bottom, the combustion-supporting wind oxygen of secondary air is sufficient, and the height that is higher than furnace bottom ensures that the secondary air can not support combustion to the sufficient material of furnace bottom, but utilize the high temperature of flame in the furnace, combine the abundant oxygen content of secondary air to the abundant burning of the combustible floating thing on the carbon monoxide in the updraft and the filter screen, carbon monoxide in the reduction tail gas, make it reach emission standard. The scheme solves the problem that the concentration of flue gas and carbon monoxide exceeds the standard in the emission of the combustion and carbonization integrated furnace, and the direct carbonization of agricultural wastes such as field ground straws and the like is adopted.

Preferably, the lower part of the lower hearth is in a funnel shape with a gradually increasing cross section from bottom to top. The airflow velocity at the upper part of the hearth is reduced, and the time of secondary combustion of the carbon monoxide is increased.

Preferably, an upward extending section is arranged at the opening of the hearth section of the screw sleeve, a flanging is outwards arranged on the top surface of the extending section, and the bottom surface of the lower hearth is connected with the flanging of the extending section through a flange. The connection width of the bottom of the lower hearth and the screw sleeve is small, and reliable connection is ensured by adopting flange connection.

Preferably, the top surface of the lower hearth clamps and fixes the filter screen by adopting a clamping plate, the upper hearth is buckled above the lower hearth, and a plurality of angle steel positioning sheets for positioning the upper hearth are arranged on the clamping plate on the top surface of the lower hearth; the top surface of the upper hearth adopts a clamping plate to clamp and fix the filter screen, the top cover is buckled above the upper hearth, and a plurality of angle steel positioning pieces for positioning the top cover are arranged on the clamping plate on the top surface of the upper hearth. Go up the bottom surface width of furnace, top cap big, adopt detachable to detain and establish the structure, guaranteeing stable colleague convenient dismantlement, clear up the change to the filter screen.

Preferably, the end face of the lower hearth or the upper hearth is provided with a plurality of observation ports.

Preferably, the front end and the rear end of the conveying screw are respectively provided with a front bearing and a rear bearing; the machine frame is also provided with a conveying motor for driving the conveying screw to rotate, and the conveying motor and the front end of the conveying screw are in belt transmission, chain transmission or gear transmission; the conveying screw front bearing is fixed at the front end of the screw sleeve; the top surface welding of cooling section has the channel-section steel, and the channel-section steel rear end stretches out to the rear of cooling section and sets up logical groove between two parties, be equipped with the adjusting screw of liftable in leading to the inslot, the adjusting screw lower extreme hangs and is equipped with location conveying screw rear bearing.

Preferably, one or more groups of bilaterally symmetrical rollers are arranged at the bottom end of the frame. The frame can be fixed setting, also can set up the gyro wheel and promote, conveniently changes in the field ground.

The invention adopts the combustion carbonization integrated hearth to carry out carbonization treatment on agricultural wastes and solves the problem that the flue gas and the carbon monoxide in the emission exceed the standard; the device is adapted to direct carbonization of agricultural wastes such as field ground straws and the like by using a simple structure.

Drawings

The invention is further described below with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of an embodiment of the present invention.

Fig. 2 is a schematic diagram of a structure of the conveying screw rod of the invention penetrating in the machine body.

Fig. 3 is a schematic view of a conveyor screw according to the present invention.

Fig. 4 isbase:Sub>A schematic view of the structurebase:Sub>A-base:Sub>A of fig. 2 of the present invention.

Fig. 5 is a schematic structural view of a furnace of the present invention.

FIG. 6 is a schematic diagram of the structure B-B in FIG. 2 according to the present invention.

FIG. 7 is a schematic view of a screw jacket hearth section of the present invention.

Fig. 8 is a schematic view of the structure of fig. 2 in the direction of C.

Fig. 9 is a schematic view of a cooling section of the present invention.

In the figure: 1. screw rod cover, 2, feeding section, 3, first furnace chamber section, 4, second furnace chamber section, 5, cooling section, 6, discharge port, 7, conveying motor, 8, front bearing, 9, feed hopper, 10, ignition port, 11, first furnace chamber, 12, second furnace chamber, 13, exhaust pipe, 14, water curtain dust remover, 15, chimney, 16, exhaust fan, 17, rear bearing, 18, secondary air inlet pipe, 19, conveying screw, 20, air inlet jacket, 21, primary air inlet fan, 22, secondary air inlet fan, 23, front screw rod section, 24, middle screw rod section, 25, rear screw rod section, 26, lower furnace chamber, 27, upper furnace chamber, 28, top cover, 29, air outlet, 30, filter screen, 31, splint, 32, angle steel positioning sheet, 33, observation port, 34, furnace chamber section opening, 35, extension, 36, flanging, 37, channel steel, 38, through groove, 39 and adjusting screw rod.

Detailed Description

The invention is further illustrated by the following specific examples in conjunction with the accompanying drawings.

Example (b): a continuous combustion carbonization furnace, as shown in figure 1, comprises a frame, wherein the frame can be a fixed structure, and also can be provided with one or more groups of bilaterally symmetrical rollers at the bottom of the frame to form a rolling bracket.

As shown in fig. 1 and 2, a conveying screw 19 for conveying from front to back is arranged on the frame, and a screw sleeve 1 is arranged outside the conveying screw. The screw sleeve is sequentially arranged into a feeding section 2, a first hearth section 3, a second hearth section 4 and a cooling section 5 in a segmented manner from front to back. The upper wall of the screw sleeve feeding section 2 is opened and connected with a feed hopper 9, and the upper wall of the screw sleeve behind the feed hopper 9 is provided with an ignition port 10; the upper wall of the first hearth section 3 of the screw sleeve 1 is opened and covered with a first hearth 11; the upper wall of the second hearth section 4 of the screw sleeve 1 is opened and covered with a second hearth 12; the cooling section 5 is sealed from top to bottom, left and right, and the rear end of the cooling section 5 is a discharge hole 6. The top of first furnace 11 and second furnace 12 is connected with exhaust pipe 13, exhaust pipe 13 is connected with water curtain dust remover 14, and water curtain dust remover 14 air outlet is connected with chimney 15 through air exhaust fan 16, and the delivery port of water curtain dust remover sets up in the top of cooling zone discharge gate 6. The feeding section 2, the first hearth section 3, the second hearth section 4 and the cooling section 5 of the screw sleeve 1 are arranged in a segmented mode and are connected in series in sequence through flanges.

As shown in fig. 2 and 3, the conveying screw 19 comprises a screw shaft and a helical blade, the conveying screw 19 comprises a front screw section 23, a middle screw section 24 and a rear screw section 25, the pitch of the helical blade of the front screw section 23, the middle screw section 24 and the rear screw section 25 increases in sequence, the joint of the front screw section 23 and the middle screw section 24 is arranged between the feed hopper 9 and the ignition port 10, and the joint of the middle screw section 23 and the rear screw section 24 is arranged at the rear part of the second hearth section 12. The pitch of the helical blades of the rear screw section 25 is more than 1.5 times that of the helical blades of the front screw section, so that the height of the material of the rear screw section is lower than that of the screw shaft, and the carbonization and agglomeration of the material are reduced and the adhesion of the material on the screw shaft is reduced. The front end and the rear end of the conveying screw rod 19 are respectively provided with a front bearing 8 and a rear bearing 17; the machine frame is also provided with a conveying motor 7 for driving the conveying screw rod to rotate, and the conveying motor and the front end of the conveying screw rod are in belt transmission, chain transmission or gear transmission. The front bearing of the conveying screw is fixed at the front end of the screw sleeve. As shown in fig. 8 and 9, a channel steel 37 is welded on the top surface of the cooling section 5, the rear end of the channel steel extends to the rear of the cooling section, a through groove 38 is formed in the middle of the cooling section, a liftable adjusting screw 39 is arranged in the through groove, and a positioning conveying screw rear bearing 17 is hung at the lower end of the adjusting screw.

As shown in FIG. 4, the hopper 9 is a conical hopper with the bottom aligned with the feed section opening of the screw housing.

The structures of the furnace chambers are the same, taking the first furnace chamber 11 as an example, as shown in fig. 5, 6 and 7, the lower sides of the left side and the right side of the furnace chamber section 3 of the screw sleeve are provided with air inlet jackets 20, the air inlet jackets are connected with primary air inlet fans 21, and the side walls of the furnace chamber section corresponding to the air inlet jackets 20 are uniformly provided with air inlet holes. A lower hearth 26, an upper hearth 27 and a top cover 28 are sequentially stacked above the screw sleeve hearth section 3, a filter screen 30 is arranged between the lower hearth 26 and the upper hearth 27, and the filter screen 30 is arranged between the upper hearth 27 and the top cover 28; a secondary air inlet pipe 18 is arranged at the lower part of the upper hearth close to the filter screen 30, secondary air inlet holes are uniformly formed in the secondary air inlet pipe 18, and the secondary air inlet pipe is connected with a secondary air inlet fan 22; and an air outlet 29 connected with the exhaust pipe 13 is formed in the top surface of the top cover 28. The lower part of the lower hearth 27 is funnel-shaped with gradually increasing cross section from bottom to top. An upward extending section 35 is arranged at the position of a hearth section opening 34 of the screw sleeve, a flanging 36 is outwards arranged on the top surface of the extending section, and the bottom surface of the lower hearth 26 is connected with the flanging 36 of the extending section through a flange. The top surface of the lower hearth 26 adopts a clamping plate 31 to clamp and fix the filter screen 30, the upper hearth is buckled above the lower hearth, and a plurality of angle steel positioning sheets 32 for positioning the upper hearth are arranged on the clamping plate on the top surface of the lower hearth; the top surface of the upper hearth adopts a clamping plate 31 to clamp and fix the filter screen 30, the top cover is buckled above the upper hearth, and a plurality of angle steel positioning pieces 32 for positioning the top cover are arranged on the clamping plate on the top surface of the upper hearth. Two end faces of the lower hearth are provided with observation ports.

When the straw is used as a material, when the device is used, the straw is added into the feeding hopper, the straw falls into the conveying screw, the conveying screw enables the fully-loaded straw to sink 10-30% due to the increase of the distance between the spiral blades when the conveying screw conveys backwards, the straw is convenient to ignite, the material enters the first hearth and the second hearth in sequence after being ignited at the ignition port, the air inlet jackets at the bottoms of the first hearth and the second hearth supply air for supporting combustion, the straw is combusted, combustible floating objects generated in the combustion process are hung on the filter screen to be burnt out, carbon monoxide generated in the combustion process is combusted by sufficient oxygen consumption fed into the upper part of the high-temperature hearth by the secondary air inlet pipe, fly ash is dedusted by the water curtain deduster, the discharged tail gas is clean and meets the discharge standard, the material passing through the first hearth and the second hearth is further flattened by the secondary increase of the distance between the spiral blades and is lower than the screw shaft, the material enters the cooling section to be sealed, oxygen-insulated, uniformly carbonized and finally discharged from the discharge port, and the water drops of the water curtain deduster are dripped onto the final product at the discharge port for cooling, and the post-combustion is prevented. The device integrates material combustion and carbonization, the straw is obtained locally in the field, the final product is an ash-carbon-residual straw mixture which can be directly returned to the field, and the cleanliness of the tail gas discharged by combustion is high after the carbon monoxide is removed and ash is discharged. The device has simple and rough structure and no refinement requirement, the raw material is agricultural waste which is urgently needed to be treated in the field, the product can be directly returned to the field, the discharge is clean, and the device is particularly suitable for the direct carbonization treatment of the waste such as crop straws and the like in the field.

Claims

1. The utility model provides a continuous type burning retort, includes the frame, its characterized in that: the frame is provided with a conveying screw rod conveyed from front to back, a screw rod sleeve is arranged on the outer side of the conveying screw rod, the screw rod sleeve is sequentially arranged into a feeding section, one or more sections of hearth sections and a cooling section in a segmented mode from front to back, the upper wall of the feeding section of the screw rod sleeve is provided with an opening and connected with a feeding hopper, and the upper wall of the screw rod sleeve behind the feeding hopper is provided with an ignition port; the upper wall of the hearth section of the screw rod sleeve is provided with an opening and is covered with a hearth; the cooling section is sealed from top to bottom, left and right, and the rear end of the cooling section is a discharge hole; the utility model discloses a cooling section, including furnace, delivery screw, exhaust pipe, cooling section discharge gate, conveying screw, screw shaft, screw blade, the top of furnace is connected with the exhaust pipe, the exhaust pipe is connected with the water curtain dust remover, and the water curtain dust remover air outlet is connected with the chimney through the fan of airing exhaust, and the rear end of cooling section is connected or set up in the top of cooling section discharge gate to the delivery port of water curtain dust remover, conveying screw includes screw shaft and helical blade, helical blade interval is progressively increased from the past backward.

2. A continuous combustion carbonization furnace as claimed in claim 1, wherein: the conveying screw comprises a front screw section, a middle screw section and a rear screw section, the distance between the spiral blades of the front screw section, the middle screw section and the rear screw section is sequentially increased, the joint of the front screw section and the middle screw section is arranged between the feed hopper and the ignition port, and the joint of the middle screw section and the rear screw section is arranged at the rear part which is closest to the rear hearth section.

3. A continuous combustion carbonization furnace as claimed in claim 1, characterized in that: the lower part of the lower side of the hearth section of the screw sleeve and the lower parts of the left side and the right side of the hearth section are provided with air inlet clamping sleeves, the air inlet clamping sleeves are connected with primary air inlet fans, and air inlet holes are uniformly formed in the side walls of the hearth sections corresponding to the air inlet clamping sleeves.

4. A continuous combustion carbonization furnace as claimed in claim 1, 2 or 3, wherein: a lower hearth, an upper hearth and a top cover are sequentially stacked above the hearth section of the screw sleeve, a filter screen is arranged between the lower hearth and the upper hearth, and a filter screen is arranged between the upper hearth and the top cover; a secondary air inlet pipe is arranged at the lower part of the upper hearth or in the lower hearth in a penetrating manner, secondary air inlet holes are uniformly formed in the secondary air inlet pipe, and the secondary air inlet pipe is connected with a secondary air inlet fan; and the top surface of the top cover is provided with an air outlet connected with an exhaust pipe.

5. A continuous combustion carbonization furnace as claimed in claim 4, wherein: the lower part of the lower hearth is in a funnel shape with the cross section gradually increasing from bottom to top.

6. A continuous combustion carbonization furnace as claimed in claim 4, characterized in that: the screw rod cover is characterized in that an upward extending section is arranged at the opening of the hearth section of the screw rod cover, a flanging is outwards arranged on the top surface of the extending section, and the bottom surface of the lower hearth is connected with the flanging of the extending section through a flange.

7. A continuous combustion carbonization furnace as claimed in claim 4, wherein: the top surface of the lower hearth clamps and fixes the filter screen by adopting a clamping plate, the upper hearth is buckled above the lower hearth, and a plurality of angle steel positioning pieces for positioning the upper hearth are arranged on the clamping plate on the top surface of the lower hearth; the top surface of the upper hearth adopts a clamping plate to clamp and fix the filter screen, the top cover is buckled above the upper hearth, and a plurality of angle steel positioning pieces for positioning the top cover are arranged on the clamping plate on the top surface of the upper hearth.

8. A continuous combustion carbonization furnace as claimed in claim 4, characterized in that: and a plurality of observation ports are arranged on the end surface of the lower hearth or the upper hearth.

9. A continuous combustion carbonization furnace as claimed in claim 1, 2 or 3, characterized in that: the front end and the rear end of the conveying screw are respectively provided with a front bearing and a rear bearing; the machine frame is also provided with a conveying motor for driving the conveying screw to rotate, and the conveying motor and the front end of the conveying screw are in belt transmission, chain transmission or gear transmission; the conveying screw front bearing is fixed at the front end of the screw sleeve; the top surface of the cooling section is welded with channel steel, the rear end of the channel steel extends to the rear side of the cooling section, a through groove is formed in the middle of the channel steel, a liftable adjusting screw is arranged in the through groove, and a rear bearing of the positioning conveying screw is hung at the lower end of the adjusting screw.

10. A continuous combustion carbonization furnace as claimed in claim 1, 2 or 3, characterized in that: the bottom of the frame is provided with one or more groups of bilaterally symmetrical rollers.