CN110671930A - Annular kiln for firing green bricks and tiles - Google Patents

Abstract

A ring kiln for firing green tiles comprises a kiln path and a main flue (5), wherein kiln doors (10) are uniformly distributed on the kiln path, a flue inlet (2) is formed in the lower part of the kiln path, and the flue inlet (2) is communicated with the main flue (5); the main flue (5) is communicated with a main flue (32), and the main flue (32) is provided with an exhaust fan (33); the top of the kiln path is provided with a coal feeding hole (17); the method is characterized in that: a separation wall (16) is arranged between the adjacent kiln doors (10), a kiln passage between the adjacent separation walls (16) forms a kiln chamber (15), a door opening (25) is formed at the lower part of the separation wall (16), and a sealing door (9) is arranged on the door opening (25); the cooling pipe (11) is distributed in each kiln chamber (15), one end of each cooling pipe (11) is communicated with the atmosphere after passing through the kiln body (1), the other end of each cooling pipe is communicated with the cooling manifold (12), a manifold valve (13) is arranged on each cooling manifold (12), each manifold valve (13) is communicated with a cooling main pipe (14), and each cooling main pipe (14) is connected with a fan.

Description

Annular kiln for firing green bricks and tiles

Technical Field

The invention relates to a ring kiln, in particular to a ring kiln for sintering archaized bricks, tiles, building blocks and patches (hereinafter collectively referred to as grey bricks and tiles). If necessary, the annular kiln can be simply improved and reduced into the traditional annular kiln for firing red tiles, namely, the annular kiln can be interchanged between green tile firing and red tile firing after corresponding changes are made to the auxiliary facilities of the kiln.

Background

With the trend of people to better and better life, the expectation on the antique building is higher and higher, and the market demand on the antique building materials is also increased continuously. The existing antique building materials mainly have two production modes, namely a non-sintered type and a sintered type. The baking-free antique building material has the defects of low compressive strength, single surface color and the like because of no sintering, and has poor market prospect. The sintered antique building materials have the characteristics of high compressive strength and 'brick color and thousand color', and are well pursued by the market, but the antique building materials are prepared by adopting a traditional 'tank kiln', so that a plurality of problems exist in the aspects of efficiency and the like, and the sintered antique building materials are mainly expressed in the following aspects:

1. the traditional pot kiln can be taken out of the kiln for the next kiln after being flamed out for 7-10 days and cooled, so that continuous production can not be realized, and the production efficiency is seriously influenced.

2. The traditional 'tank kiln' is mainly controlled by the experience of a kiln master during sintering, and the sintering temperature cannot be accurately controlled.

3. The traditional 'tank kiln' sintered antique building materials are mainly cooled by water to generate cyan, and the color change is also determined by the experience of a kiln master.

Even if the investment of the newly-built blue brick tunnel kiln is large.

How to change the current situation, realize the new and improved annular kiln to burn the green brick and tile or spend the little expense on transforming on the basis of the existing annular kiln, meet the production requirement of the antique building materials, become one of the subjects of studying the preparation method of the antique building materials. Accurate control is carried out in the production process to form an antique building material preparation system, which becomes the direction of the preparation and development of the antique building materials.

Chinese patent application No. CN201820314535 discloses a tunnel kiln device for firing green bricks, comprising a kiln car, a kiln top, kiln walls at two sides and a middle channel; the middle channel longitudinally penetrates through the whole kiln and can be divided into a drying kiln and a sintering kiln according to the advancing direction of the kiln car; the sintering kiln consists of a preheating zone, an oxidation roasting zone, a reduction roasting zone and a cooling zone; a plurality of pairs of air brakes and a plurality of pairs of burners are arranged on two sides of the preheating zone, a waste heat boiler is arranged on the lower portion of the preheating zone, and a first fan is arranged on the upper portion of the preheating zone; a plurality of fuel nozzles are arranged on two sides of the oxidizing roasting zone; two pairs of roasting chambers are arranged on two sides of the reduction roasting zone; the cooling zone is provided with a second fan, and the second fan is pumped into the outdoor air cooling brick body and is output through a secondary air duct.

Chinese patent application No. CN201721291696 discloses an energy-saving kiln capable of continuously firing blue and green tiles, which consists of a preheating section, a firing section and a reduction water cooling section. The front end of the preheating section and the rear end of the reduction water cooling section are sealed by sealing doors, the firing section comprises firing nozzles, a firing air inlet branch pipe and a firing air inlet pipe, the firing section is provided with a smoke suction port, the preheating section comprises a preheating section branch smoke pipe and a preheating section main flue, a furnace chamber of the preheating section is provided with a fire-spraying port, and the firing section main flue is connected with the preheating section fire-spraying port; the reduction burner is connected with the reduction air inlet pipe through a valve and a reduction air inlet branch pipe, and redundant reduction gas enters the sintering section through the gas collecting hopper and the gas collecting pipeline to be fully combusted.

However, the above inventions are all tunnel kilns, which are large in investment and not suitable for wheel kilns, and the effect of the produced green bricks and tiles is still not ideal.

Chinese patent application No. CN93104195 discloses a ring kiln for producing green brick and tile and a production method thereof, comprising an internal fire box capable of adjusting the atmosphere in the kiln, an improved water spraying device and a thinner partition wall of the kiln chamber for reliably and conveniently controlling the atmosphere when the green brick and tile are fired and twisted with smoke. And provides a method for producing the green brick and tile by using the annular kiln. In the existing common annular kiln for producing red bricks and tiles, on the premise of not damaging the kiln body and the kiln wall, under the condition that other structures of the kiln body are not changed, an internal partition wall and an internal fire box are simply constructed in the kiln, so that each kiln chamber can be isolated mutually, a water spraying device is modified, and the production process is properly changed, thereby the kiln can produce the green bricks and tiles on a large scale. The method specifically comprises the following steps: a kiln chamber; the internal partition wall is arranged close to the smoke exhaust hole of a kiln chamber, is built by refractory clay bricks below the nearest row of coal feeding holes, and is also provided with a hollow interlayer in the middle; in addition, the rectangular channels in the partition walls are aligned to the centers of the coal feeding holes and can be used for injecting sand to close fire paths, 4 channels are arranged in each partition wall, the fire paths are aligned to the centers of the coal feeding holes on the top of the kiln and are positioned at the lower parts of the partition walls, four kiln chambers are arranged, and the total area of the four kiln chambers is 30-40% of the section of the kiln; an internal firebox; the fire boxes are built by clay refractory bricks, the interior of each fire channel is made of a refractory iron casting or a refractory concrete prefabricated part as a fire bar, air for combustion of the fire boxes is supplied by a movable air blower on the outer side of the kiln through an air channel at the bottom of a kiln door, and the center of a coal inlet of each fire box is aligned to the center of a coal feeding hole on the top of the kiln so as to add coal; an air passage; a shutter plate; the lifting rod of the gate plate can be made of heat-resistant stainless steel, so that the opening degree of the gate plate can be adjusted, and the gate plate can be used for controlling the sealing or positive pressure of a kiln; a flue is branched; a kiln door; coal feeding holes; is a main flue; an air drum inlet; the water spraying device is arranged on the top of the kiln and passes through coal feeding holes in the middle of the kiln chambers, and one water spraying device is arranged in each kiln chamber; fire bars in the internal firebox, etc. The structure is very complicated, the manufacturing cost is high, the maintenance is also troublesome, the next kiln can be carried out after the temperature is reduced for a plurality of days after flameout, the water injection quantity is difficult to control, the continuous production can not be realized, the production efficiency is seriously influenced, and the like.

Disclosure of Invention

The invention aims to design an improved wheel kiln for firing green bricks and tiles by adopting the wheel kiln principle; or a large number of existing annular kilns in China are improved by using smaller investment, so that the purpose of firing not only the grey bricks but also the archaized tiles, the building blocks, the patches and the like is achieved.

The basic concept of the invention is as follows: at the theoretical separation part of the kiln chamber, a separation wall is arranged for physical separation, a door opening is reserved, the door opening and a door opening sealing door made of high-temperature resistant materials are used for enabling the roasting flame to pass or be blocked, and the air duct sends hot air to a drying room for drying the green bricks; a temperature probe can be arranged in each kiln chamber, and a computer is arranged for display and control. Such a kiln can change the kiln chamber to a "1 + N (i.e., one or N oxidative roasting zones)" mode, depending on the roasting conditions.

The specific design scheme of the invention is as follows:

an annular kiln for firing green tiles, comprising a kiln path forming a closed loop and a main flue forming a closed loop, which are arranged in a kiln body, wherein:

a plurality of kiln doors leading to the atmosphere are uniformly distributed on the kiln path, the side wall of the lower part of the kiln path at one side of each kiln door is provided with a flue inlet, the flue inlet is communicated with a main flue through a branch flue, a conical gate (or called as a Hafeng gate and a smoke gate) is arranged between the branch flue and the main flue, and the top of the wheel kiln body is provided with a conical gate lifting mechanism;

the main flue is communicated with a main flue arranged outside, and an exhaust fan is arranged on the main flue;

coal feeding holes leading to the top of the annular kiln body are uniformly distributed at the top of the kiln way;

the method is characterized in that:

the middle line between two adjacent kiln doors is provided with a separation wall, a kiln path between two adjacent separation walls forms a kiln chamber, the lower part of the separation wall is provided with a door opening, the door opening is provided with a sealing door, the top of the wheel kiln body is provided with a sealing door lifting mechanism, and the door opening can be in various shapes such as rectangle, horseshoe shape, inverted trapezoid and the like; the main function of the door opening is to ensure that enough air (nutrient gas) enters the roasting chamber during roasting, and enough cold air enters the cooling chamber during cooling, and the sealing door is used for plugging the door opening, so that the freshly-roasted bricks and tiles are in an anaerobic state at high temperature, and the yield of the green bricks and tiles is ensured;

in every kiln room, the equipartition has a plurality of cooling pipes on the sectional wall of kiln room along, pass through air intake and atmosphere intercommunication behind the wheel kiln body in the one end of every cooling pipe, the other end of cooling pipe communicates on a cooling manifold, be equipped with the manifold valve on the cooling manifold, the cooling that manifold valve exit end intercommunication established in addition is responsible for, the cooling is responsible for and is linked to each other with a row of hot-blast fan, thereby make the cooling chamber cool down as early as possible, the cooling pipe can hide and arrange in the wall or in the outer kiln room of wall, but arrange and be more convenient for maintain the change cooling pipe in the outer kiln room of wall.

Preferably: the isolation wall is a double-layer wall with a gap in the middle, and the sealing door is arranged in the gap, but the design is inconvenient for maintaining or replacing the lifting mechanism of the sealing door, and the efficiency of transmitting the fire source to the next kiln chamber to be fired by heat radiation can be greatly reduced.

Preferably: the division wall is the individual layer wall, and the sealing door is adorned in division wall one side, and this kind of design is convenient for maintain or change sealing door elevating system, and its efficiency toward waiting the next kiln room heat radiation transmission burning things which may cause a fire disaster also can improve greatly, but sealing door elevating system can directly be in the face of high temperature, changes sealing door elevating system relatively frequently, and it is higher to sealing door elevating system's fire resistance performance requirement.

Preferably: the division wall is located door opening department and has been built with the door frame foundation, and all has been built with the door frame foundation in door opening both sides on one side, top parallel at the door frame foundation is fixed with two horizontal door frames, leave the current clearance of confession sealing door between two horizontal door frames, be fixed with relative arrangement below the horizontal door frame and hug closely a pair of oblique door frame of door frame foundation inner wall, sealing door is controlled by between the oblique door frame of both sides, it is suitable that the sealing door is corresponding to adopt down trapezoidal when so designing, it can strengthen the seal better to fall trapezoidal.

Preferably: the horizontal door frame and the inclined vertical door frame are fixed on the door frame foundation column through refractory mortar.

Preferably: still nailed the horizontal door frame staple between horizontal door frame and the door frame foundation, still nailed the oblique door frame staple of founding between oblique door frame and the door frame foundation to further guarantee the steadiness of door frame.

Preferably: the two horizontal door frames are U-shaped pieces with opposite openings, and horizontal sealing strips are filled in U-shaped grooves of the U-shaped pieces; the two oblique vertical door frames are U-shaped pieces with opposite openings, and oblique vertical sealing strips are filled in U-shaped grooves of the U-shaped pieces; the sealing door is controlled in the U-shaped groove, so that the tightness can be further enhanced, and the sealing strips can be made of refractory materials such as rock wool, glass fiber and the like.

Preferably: the cooling main pipe is communicated with the main flue or the main flue, and the cooling main pipe and the main flue share the exhaust fan, so that the multifunctional cooling device is multipurpose.

Preferably: the conical brake lifting mechanism comprises a spiral disc and a lifting rod, the lower end of the lifting rod is connected with the conical brake, and the upper end of the lifting rod is matched with the spiral disc; the sealing door lifting mechanism comprises another spiral disc and a sealing door lifting rod, the lower end of the sealing door lifting rod is connected with the sealing door, the upper end of the sealing door lifting rod is matched with the other spiral disc, the conical brake lifting mechanism principle similar to that of the existing annular kiln is also adopted, and the sealing door can be lifted and opened or closed by adopting the prior art in other forms.

Preferably: the cooling pipe is provided with heat exchange (fin) sheets to further enhance the cooling effect.

The production method comprises the following steps: stacking in a kiln according to conventional methods of sintering bricks, tiles, building blocks, patches and the like in a ring kiln, controlling the roasting temperature of 900-1100 ℃ for sintering for 6-10 hours, then closing a conical gate lifting mechanism and a sealing door lifting mechanism of the kiln chamber, isolating the conical gate lifting mechanism and the sealing door lifting mechanism from a later roasting zone, isolating the external air to form a cooling reduction kiln chamber, exhausting oxygen in the kiln and a green brick, simultaneously opening an air gate for air draft and cooling, and cooling the green brick in an oxygen-deficient atmosphere until the temperature of the green brick cannot be oxidized again to finish the whole reduction and green turning.

In the invention, the sealing door is a fire-resistant door, a ceiling is also arranged on the annular kiln body, a drying room for drying blanks is usually additionally built outside the annular kiln body, hot air exhausted by a fan on the cooling main pipe and flue gas exhausted by an exhaust fan of a main flue are introduced into the drying room for drying blanks, the cooling main pipe can also be communicated with the flue, the exhaust fan simultaneously exhausts the flue gas and the hot air, so that an additional fan does not need to be arranged on the cooling main pipe, the horizontal sealing strips and the inclined sealing strips are made of refractory materials such as rock wool, glass fiber cloth and the like, the main flue sends the air to the drying room for pre-drying the brick blanks, the cooling pipes, the cooling manifold, the manifold valve and the cooling main pipe form an air cooling system, 3-5 cooling pipes are preferably arranged in each kiln room, wherein one section of the cooling pipe positioned on the kiln.

The invention utilizes the characteristic of sustainable production of the annular kiln, realizes the purpose of circular roasting without flameout, solves the problem of production pause caused by 'fire stopping' of the traditional green brick kiln, reduces the waste of energy and improves the efficacy. The air cooling system can greatly reduce the cooling time. The annular kiln is much lower in cost than the scheme disclosed in CN93104195, small in occupied effective space and high in production efficiency.

Drawings

FIG. 1 is a partial cross-sectional view of a front view of an embodiment of the present invention;

FIG. 2 is a partial cross-sectional view of the top view of FIG. 1;

FIG. 3 is a sectional view of the kiln chamber;

FIG. 4 is a cross-sectional view A-A of FIG. 1;

FIG. 5 is an enlarged view of a portion of the area P of FIG. 4;

FIG. 6 is a cross-sectional view C-C of FIG. 4;

FIG. 7 is a partial enlarged view of the area S of FIG. 6;

FIG. 8 is a cross-sectional view of the D-D step of FIG. 4;

FIG. 9 is a schematic diagram of an air cooling system of the present invention;

fig. 10 is a sectional view B-B of fig. 1.

In the figure: 1. a wheel kiln body; 2. a flue inlet; 3. a flue is branched; 4. conical gates (hafeng); 5. a main flue; 6. a lifting bar; 7. a conical gate lifting mechanism; 8. a sealing door lifting mechanism; 9. a sealing door; 10. a kiln door; 11. a cooling pipe; 12. cooling the manifold; 13. a manifold valve; 14. cooling the main pipe; 15. a kiln chamber; 16. a partition wall; 17. coal feeding holes; 18. a sealing door lifting rod; 19. a connecting member; 20. a horizontal door frame; 21. a horizontal sealing strip; 22. a horizontal doorframe fixing nail; 23. obliquely erecting a door frame; 24. obliquely erecting a sealing strip; 25. a door opening; 26. a foundation; 27. refractory mortar; 28. obliquely standing the fixing nail; 29. a heat exchanger fin; 30. an air inlet; 31. a doorframe base post; 32. a main flue; 33. an exhaust fan.

Detailed Description

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

Referring to fig. 1, 2, 3, 4, 8 and 9, a rotary kiln for firing green tiles comprises a closed-loop-forming tunnel and a closed-loop-forming main flue 5 provided in a rotary kiln body 1, wherein:

a plurality of kiln doors 10 leading to the atmosphere are uniformly distributed on the kiln path, the side wall of the lower part of the kiln path at one side of each kiln door 10 is provided with a flue inlet 2, the flue inlets 2 are communicated with a main flue 5 through branch flues 3, a conical gate 4 is arranged between the branch flues 3 and the main flue 5, and the top of the annular kiln body 1 is provided with a conical gate lifting mechanism 7 of the conical gate 4;

the main flue 5 is communicated with a main flue 32 arranged outside, and an exhaust fan 33 is arranged on the main flue 32;

coal feeding holes 17 leading to the top of the kiln wheel body 1 are uniformly distributed at the top of the kiln path;

the method is characterized in that:

a separation wall 16 is arranged at the center line between two adjacent kiln doors 10, a kiln passage between two adjacent separation walls 16 forms a kiln chamber 15, the lower part of the separation wall 16 is provided with a door opening 25, a sealing door 9 is arranged on the door opening 25, and the top of the annular kiln body 1 is provided with a sealing door lifting mechanism 8;

in every kiln 15, 5 cooling pipes 11 have been equipartition on the wall along the 15 cross sections in kiln room, and the one end of every cooling pipe 11 is passed through wheel kiln body 1 back and is passed through air intake 30 and atmosphere intercommunication, and on cooling manifold 12 was communicated to the other end of cooling pipe 11, cooling manifold 12 was last to be equipped with manifold valve 13, and manifold valve 13 exit end intercommunication is responsible for 14 in the cooling of establishing in addition, and the cooling is responsible for 14 and is linked to each other with a fan. The cooling pipe 11, the cooling manifold 12, the manifold valve 13 and the cooling main pipe 14 form an air cooling system.

The partition wall 16 may be a double wall with a gap in the middle, and the sealing door 9 is installed in the gap (not shown).

Referring to fig. 4, 6 and 8, the partition wall 16 is a single-layer wall, and the sealing door 9 is installed on one side of the partition wall 16.

As shown in fig. 6, 7 and 8, the partition wall 16 is provided with door frame pillars 31 at the door opening 25, the door frame pillars 31 are provided at both sides of one side of the door opening 25, two horizontal door frames 20 are fixed at the top of the door frame pillars 31 in parallel, a gap for the passage of the sealing door 9 is provided between the two horizontal door frames 20, a pair of inclined door frames 23 which are oppositely arranged and tightly attached to the inner wall of the door frame pillars 31 is fixed below the horizontal door frames 20, and the sealing door 9 is controlled between the inclined door frames 23 at both sides.

As shown in fig. 6 and 7, the horizontal door frame 20 and the inclined door frame 23 are fixed to the door frame base 31 by the refractory mortar 27.

Horizontal doorframe fixing nails 22 are further nailed between the horizontal doorframe 20 and the doorframe base column 31, and inclined doorframe fixing nails 28 are further nailed between the inclined doorframe 23 and the doorframe base column 31.

The two horizontal door frames 20 are U-shaped pieces with opposite openings, and horizontal sealing strips 21 are filled in the U-shaped grooves; the two oblique vertical door frames 23 are U-shaped pieces with opposite openings, and oblique vertical sealing strips 24 are filled in the U-shaped grooves; the sealing door 9 is controlled in a U-shaped groove.

The main cooling duct 14 can communicate with the main flue 5 or the main flue 32, and the main cooling duct 14 and the main flue 32 share an exhaust fan 33 (not shown).

As shown in fig. 1, 4 and 6, the conical brake lifting mechanism comprises a spiral disc and a lifting rod 6, wherein the lower end of the lifting rod 6 is connected with the conical brake 4, and the upper end of the lifting rod is matched with the spiral disc; the sealing door lifting mechanism 8 comprises another spiral disc and a sealing door lifting rod 18, and the lower end of the sealing door lifting rod 18 is connected with the sealing door 9, and the upper end of the sealing door lifting rod is matched with the other spiral disc.

Referring to fig. 10, the cooling pipe 11 is provided with heat exchanging fins 29.

The firing method is basically consistent with that of the existing annular kiln: stacking in a kiln according to conventional methods of sintering bricks, tiles, building blocks, patches and the like in a ring kiln to finish moisture removal and preheating of finished products; controlling the roasting temperature of 900-1100 ℃ for sintering for 6-10 hours, then isolating the kiln chamber 15 from a subsequent roasting zone to form a cooling chamber, isolating the outside air to the maximum extent to form a cooling reduction environment, simultaneously opening the manifold valve 13 for air draft and cooling, and cooling the tiles in an oxygen-deficient atmosphere to a temperature at which the tiles cannot be oxidized again to finish the reduction of the ferric iron to the ferrous iron. The kiln chamber 15 in front of the reduction kiln chamber 15 is a roasting chamber, a preheating chamber and a moisture discharging chamber in sequence, and the circular roasting is performed according to the normal operation program without flameout. Depending on the number of doors 10 and the firing conditions, the chamber 15 can be changed to a "1 + N (i.e., one or N oxidative firing zones)" mode to achieve greater throughput and reduced green-turning. During firing, the conical gates 4 of the roasting chamber and the preheating chamber are opened, the sealing door 9 of the roasting chamber at the side close to the preheating chamber and the sealing door 9 of the preheating chamber are opened, the kiln door 10 of the preheating chamber is closed, outside air from the far end of the preheating chamber is pumped into the roasting chamber and the preheating chamber through the door opening 25 of the roasting chamber, and high-temperature heat of the roasting chamber is transferred (mainly radiated) through the isolation wall 16 to the preheating chamber close to the roasting chamber to ignite fuel in the preheating chamber during the roasting process. When the roasting chamber is burnt, the conical gate 4 of the chamber and the sealing door 9 adjacent to the preheating chamber are closed immediately, and simultaneously the manifold valve 13 of the roasting chamber is opened to suck air and reduce the temperature, the roasting chamber becomes a cooling chamber, and the ignited preheating chamber becomes a new roasting chamber, thereby continuously circulating and advancing. When the temperature of the subsequent cooling chamber is reduced to the temperature at which the bricks and tiles can not be oxidized again, the corresponding conical gate 4 and the kiln door 10 are opened to continue to forcibly reduce the temperature to be close to the room temperature, and then the bricks and tiles can be produced.

Claims (10)

1. An annular kiln for firing green tiles, comprising a closed-loop forming kiln path and a closed-loop forming main flue (5) provided in a kiln body (1), wherein:

a plurality of kiln doors (10) leading to the atmosphere are uniformly distributed on the kiln way, the side wall of the lower part of the kiln way at one side of each kiln door (10) is provided with a flue inlet (2), the flue inlets (2) are communicated with a main flue (5) through branch flues (3), a conical gate (4) is arranged between the branch flues (3) and the main flue (5), and the top of the kiln wheel body (1) is provided with a conical gate lifting mechanism (7);

the main flue (5) is communicated with a main flue (32) arranged outside, and the main flue (32) is provided with an exhaust fan (33);

coal feeding holes (17) leading to the top of the rotary kiln body (1) are uniformly distributed at the top of the kiln channel;

the method is characterized in that:

a separation wall (16) is arranged at the center line between two adjacent kiln doors (10), a kiln passage between two adjacent separation walls (16) forms a kiln chamber (15), a door opening (25) is formed at the lower part of the separation wall (16), a sealing door (9) is arranged on the door opening (25), and a sealing door lifting mechanism (8) is arranged at the top of the wheel kiln body (1);

in every kiln room (15), the equipartition has a plurality of cooling pipes (11) on the sectional wall of kiln room (15) along, pass through air intake (30) and atmosphere intercommunication behind the wheel kiln body (1) for the one end of every cooling pipe (11), the other end of cooling pipe (11) communicates on one cooling manifold (12), be equipped with manifold valve (13) on cooling manifold (12), the cooling that manifold valve (13) exit end intercommunication was established in addition is responsible for (14), the cooling is responsible for (14) and is linked to each other with a fan.

2. The ring kiln for firing green tiles according to claim 1, characterized in that the partition wall (16) is a double wall with a gap in the middle, and the sealing door (9) is fitted in the gap.

3. The ring kiln for firing green tiles according to claim 1, characterized in that the partition wall (16) is a single wall, and the sealing door (9) is installed at one side of the partition wall (16).

4. The ring kiln for firing green tiles according to claim 3, wherein the partition wall (16) is provided with door frame pillars (31) at the door opening (25), and door frame pillars (31) are provided at both sides of one side of the door opening (25), two horizontal door frames (20) are fixed in parallel at the top of the door frame pillars (31), a gap for the passage of the sealing door (9) is provided between the two horizontal door frames (20), a pair of inclined vertical door frames (23) which are oppositely arranged and closely attached to the inner wall of the door frame pillars (31) is fixed below the horizontal door frames (20), and the sealing door (9) is controlled between the inclined vertical door frames (23) at both sides.

5. The kiln for firing green tiles according to claim 4, characterized in that the horizontal frame (20) and the inclined frame (23) are fixed to the frame base (31) by means of refractory mortar (27).

6. The ring kiln for firing green tiles according to claim 5, characterized in that horizontal door frame fixing nails (22) are further nailed between the horizontal door frame (20) and the door frame base post (31), and slanted door frame fixing nails (28) are further nailed between the slanted door frame (23) and the door frame base post (31).

7. The ring kiln for firing green tiles according to claim 4, characterized in that: the two horizontal door frames (20) are U-shaped pieces with opposite openings, and horizontal sealing strips (21) are filled in U-shaped grooves of the U-shaped pieces; the two oblique vertical door frames (23) are U-shaped pieces with opposite openings, and oblique vertical sealing strips (24) are filled in U-shaped grooves of the U-shaped pieces; the sealing door (9) is controlled in the U-shaped groove.

8. The ring kiln for firing green tiles according to claim 1, characterized in that the main cooling duct (14) communicates with the main flue (5) or the main flue (32), and the main cooling duct (14) and the main flue (32) share an exhaust fan (33).

9. The ring kiln for firing green tiles according to claim 1, characterized in that the conical brake elevating mechanism comprises a spiral plate and an elevating rod (6), the lower end of the elevating rod (6) is connected with the conical brake (4) and the upper end is engaged with the spiral plate; the sealing door lifting mechanism (8) comprises another spiral disc and a sealing door lifting rod (18), the lower end of the sealing door lifting rod (18) is connected with the sealing door (9), and the upper end of the sealing door lifting rod is matched with the other spiral disc.

10. The ring kiln for firing green tiles according to claim 1, characterized in that the cooling tubes (11) are provided with heat exchanger fins (29).

Images