Jianzhan environmental protection dragon kiln

Abstract

The present invention discloses an environmentally friendly Jianzhan dragon kiln, comprising a kiln body and a heating unit. A number of combustion chambers are arranged on both sides of the kiln body. The heating unit comprises a hopper, a screw feeder, a feed blower and a delivery pipe; the hopper is used to hold biomass particles, and a mixing chamber is formed below it, the mixing chamber has an air inlet pipe opening and a discharge pipe opening, and the air inlet pipe opening and the discharge pipe opening are coaxial; the screw feeder is installed in the hopper to deliver the biomass particles to the mixing chamber; the air outlet pipe of the feed blower is connected to the air inlet pipe opening; the starting end of the delivery pipe is connected to the discharge pipe opening, and the end is connected to the cavity wall of the combustion chamber. The heating unit of the present invention uses biomass particles, which overcomes the defect that a large amount of pine wood needs to be cut down for firing in traditional dragon kilns, and is highly environmentally friendly. Moreover, the heating unit can accurately adjust the air volume of the feed blower and the feeding amount of the screw feeder, thereby accurately controlling the temperature.

Description

Technical Field

[0001] The invention relates to the technical field of kilns, and in particular to a Jianzhan environmentally friendly dragon kiln. Background Art

[0002] Jianzhan Dragon Kiln is built on the mountain, which is a traditional kiln in my country. As a semi-continuous kiln for firing ceramics, it needs to be built on a certain slope and is long and narrow. When the kiln fire is lit, it looks like a fire dragon swooping down, hence the name "Dragon Kiln", also known as Snake Kiln or Centipede Kiln. There is a certain height difference between the kiln head, kiln bed and kiln tail, thus forming a natural suction, resulting in a large flame, fast heating, and not easily affected by groundwater.

[0003] However, traditional dragon kilns have some typical drawbacks, such as:

[0004] 1. During the firing process of the dragon kiln, firewood needs to be added continuously, and the firing time is long, the firewood consumption is high, and a large amount of wood resources are consumed, which is not environmentally friendly;

[0005] 2. Temperature regulation is difficult, so it is extremely challenging for the craftsman’s experience and energy;

[0006] 3. Dragon kilns need to be built on the mountain, which will damage the mountain on the one hand; on the other hand, their lifespan is limited, and they often need to be repaired or even scrapped after several openings; on the other hand, they cannot be built as factories, which is not conducive to the industrialization of Jianzhan firing;

[0007] 4. During the wood burning process, a large amount of smoke is produced, which is not environmentally friendly.

[0008] Therefore, due to the many limitations of the dragon kiln and the government's increasing requirements for environmental protection, the dragon kiln firing method has gradually declined and has been gradually replaced by new firing methods such as electric firing. Therefore, it is necessary to study a new type of environmentally friendly dragon kiln. Summary of the invention

[0009] The purpose of the invention is to provide an environmentally friendly dragon kiln.

[0010] To achieve the above object, the present invention adopts the following technical solutions:

[0011] The Jianzhan environmentally friendly dragon kiln includes a kiln body, a plurality of combustion chambers are arranged on both sides of the kiln body, and a plurality of heating units, the heating units include a hopper, a screw feeder, a feed blower and a conveying pipe; the hopper is used to hold biomass particles, and a mixing chamber is formed thereunder, the mixing chamber has an air inlet pipe opening and a discharge pipe opening, and the air inlet pipe opening is coaxial with the discharge pipe opening; the screw feeder is installed in the hopper to convey the biomass particles to the mixing chamber; the air outlet pipe of the feed blower is connected to the air inlet pipe opening; the starting end of the conveying pipe is connected to the discharge pipe opening, and the end is connected to the cavity wall of the combustion chamber.

[0012] Preferably, along the length direction of the kiln body, the combustion chambers on both sides are staggered.

[0013] Preferably, it further comprises a feeding unit, which comprises a guide rail and a silo, wherein the guide rail is arranged above the kiln body, and the silo is suspended on the guide rail and moves along the guide rail to feed materials to each hopper.

[0014] Preferably, the kiln body is formed by splicing a plurality of sub-kiln bodies on the same reference plane, and along the splicing direction, the base height of each sub-kiln body increases according to a preset gradient, and each sub-kiln body is built of refractory bricks.

[0015] Preferably, the heating unit further comprises a material retaining wall, which is located in the combustion chamber and directly opposite to the end of the material conveying pipe, and a smoke gap exists between the material retaining wall and the cavity wall of the combustion chamber.

[0016] Preferably, in a top view, the retaining wall is arc-shaped, a plurality of radial baffles are provided on both sides of the retaining wall, and a smoke gap exists between the radial baffles and the cavity wall of the combustion chamber.

[0017] Preferably, an ash cleaning port and an ash scraping port facing the material retaining wall are provided on the cavity wall of the combustion chamber, and the ash cleaning port and the ash scraping port are closed by an ash cleaning door and an ash scraping door, and the size of the ash cleaning port meets the requirements for an adult's body to enter.

[0018] Preferably, it also includes a flue gas treatment unit, which includes a main flue, a branch flue, a collecting flue and a flue gas treatment device; a chimney is provided at the rear of the kiln body, and the main flue is provided with a main smoke collecting hood covering the chimney; the branch flue is provided with an auxiliary smoke collecting hood covering each cleaning door; one end of the collecting flue is merged with the main flue and the branch flue, and the other end leads to the flue gas treatment device.

[0019] Preferably, the flue gas treatment device includes a water collecting box, a cyclone processor, a sewage filter barrel, a first spray rack and a submersible pump; the water collecting box includes an overflow chamber and a return water chamber, the overflow chamber has an overflow pipe extending into the return water chamber; the smoke inlet of the cyclone processor is connected to the collecting flue, the dust exhaust port of the cyclone processor extends into the overflow chamber box and is sealed by its liquid surface, and the cyclone processor is provided with a plurality of cyclone spray heads facing the direction of the cyclone; the sewage filter barrel is located in the return water chamber to filter the overflow water of the overflow pipe; the first spray rack is multi-layered annular, which is mounted outside the sewage filter barrel, and each layer of the annular tubes is arrayed with a first spray head radially pointing to the sewage filter barrel; the submersible pump is located in the return water chamber, and it supplies water to the cyclone spray head and the first spray rack.

[0020] Preferably, the flue gas treatment device also includes a flue gas filter barrel, a second spray rack and a water curtain spray rack; the exhaust pipe of the cyclone processor extends into the return water chamber, the flue gas filter barrel is sleeved on the exhaust pipe of the cyclone processor, the flue gas filter barrel includes a guide part, a filter part and a slag holding part in sequence, the guide part has no filter holes, a guide is provided in the guide part to guide the flue gas to go down along the barrel wall of the flue gas filter barrel, the slag holding part is screwed under the filter part, and a filter screen is provided at the bottom of the slag holding part; the second spray rack is multi-layered and is sleeved outside the flue gas filter cartridge, and each layer of the annular tubes is arrayed with a second spray head radially pointing to the filter part; the water collecting tank has an exhaust chamber communicated with the return water chamber, and the water curtain spray rack is arranged at the inlet / outlet of the exhaust chamber; the submersible pump supplies water to the second spray rack and the water curtain spray rack.

[0021] After adopting the above technical solution, the present invention has the following advantages compared with the background technology:

[0022] 1. The heating unit of the present invention uses biomass particles (such as pine wood particles, which can be obtained from the waste of pine wood furniture), which overcomes the defect that a large amount of pine wood needs to be cut down for traditional dragon kiln firing, is highly environmentally friendly, and its heating unit can accurately adjust the air volume of the feed blower and the feed volume of the spiral feeder, thereby accurately controlling the temperature;

[0023] 2. The present invention is formed by splicing a number of kiln bodies on the same reference plane, and each kiln body is made of refractory bricks, so it can be built in a factory building, which avoids damage to the mountain on the one hand, greatly improves its service life on the other hand, and realizes industrialization on the other hand;

[0024] 3. The present invention is provided with a fume treatment unit, which can deeply purify the fume generated by the dragon kiln firing, thereby improving its environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is another schematic diagram of the overall structure of the present invention;

[0027] Figure 3 A top view of the present invention;

[0028] Figure 4 It is a cross-sectional view of the present invention;

[0029] Figure 5 It is a schematic diagram of the heating unit of the present invention;

[0030] Figure 6 is a cross-sectional view of a heating unit of the present invention;

[0031] Figure 7 This is a cross-sectional view of the flue gas treatment unit of the present invention.

[0032] Description of reference numerals:

[0033] Kiln body: sub-kiln body 110, combustion chamber 120, ash cleaning port 121, ash removing port 122, ash cleaning door 123, ash removing door 124, combustion-supporting blower 125, kiln door 130, column 140, socket 141, beam 150, chimney 160;

[0034] Heating unit: hopper 210, mixing chamber 211, air inlet 2111, discharge 2112, screw feeder 220, feed blower 230, feed pipe 240, baffle wall 250, radial baffle 251;

[0035] Feeding unit: guide rail 310, material bin 320;

[0036] Smoke treatment unit: main flue 410, main smoke hood 411, branch flue 420, auxiliary smoke hood 421, collecting flue 430, smoke treatment device 440, water collecting box 441, overflow chamber 4411, overflow pipe 44111, return water chamber 4412, exhaust chamber 4413, cyclone processor 442, smoke inlet 4421, dust outlet 4422, cyclone spray head 4423, cyclone spray water pipe 4424, exhaust Smoke pipe 4425, sewage filter barrel 443, first spray rack 444, first spray head 4441, submersible pump 445, flue gas filter barrel 446, guide part 4461, guide device 44611, air passage groove 44612, rib plate 44613, filter part 4462, slag holding part 4463, second spray rack 447, second spray head 4471, water curtain spray rack 448, third spray head 4481, timer 449. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0040] Please refer to Figure 1-Figure 3 As shown, the present invention discloses a Jianzhan environmentally friendly dragon kiln, which includes a kiln body, a plurality of heating units, a feeding unit and a fume treatment unit.

[0041] Please refer to Figure 4 As shown, in the present invention, the kiln body is formed by splicing a plurality of sub-kiln bodies 110 on the same reference plane (which can be a horizontal ground or an inclined plane with a certain slope). Along the splicing direction, the structures of the sub-kiln bodies 110 are substantially the same, and the base height thereof rises according to a preset gradient. Each sub-kiln body 110 is made of refractory bricks. In this embodiment, a combustion chamber 120 and a kiln door 130 for entering the sub-kiln body 110 are respectively provided on both sides of each sub-kiln body 110. Along the length direction of the kiln body, the combustion chambers 120 on both sides are staggered, which is conducive to the temperature balance in the kiln body.

[0042] Each sub-kiln body 110 also includes a plurality of columns 140 and a plurality of beams 150. The plurality of columns 140 are vertically inserted on both sides of the center line of each sub-kiln body 110. Each column 140 has an array of holes 141 along its height direction. Both ends of each beam 150 are inserted into the holes 141 of the columns 140 on both sides to form a frame for placing porcelain. The frame can be a high-temperature resistant silicon frame.

[0043] Please refer to Figure 4 , Figure 5 and Figure 6As shown, each combustion chamber 120 is equipped with a heating unit. The heating unit includes a hopper 210, a screw feeder 220, a feed blower 230 and a delivery pipe 240. Specifically, the hopper 210 is used to hold biomass particles, and a mixing chamber 211 is formed below it. The mixing chamber 211 has an air inlet port 2111 and a discharge port 2112, and the air inlet port 2111 is coaxial with the discharge port 2112. The screw feeder 220 is installed at the bottom of the hopper 210 to deliver the biomass particles to the mixing chamber 211; the air outlet pipe of the feed blower 230 is connected to the air inlet port 2111; the starting end of the delivery pipe 240 is connected to the discharge port 2112, and the end is connected to the cavity wall of the combustion chamber 120. In this way, the screw feeder 220 delivers the biomass particles (pine wood particles) to the mixing chamber 211, and the fan blows air into the mixing chamber 211. The biomass particles and air are mixed in the mixing chamber 211, and then enter the combustion chamber 120 through the delivery pipe 240 for combustion. The mixing effect is good, which facilitates the full combustion of the biomass particles. Since the air volume of the feed blower 230 and the feeding amount of the screw feeder are flexibly adjustable, the present invention can accurately control the temperature.

[0044] In the process of firing porcelain (Jianzhan), the present invention can use a sagger to place the green body to be fired, or can place the green body to be fired directly on the frame without using a sagger. In order to adapt to the firing method without placing a sagger, and to prevent the biomass particles and their smoke from directly pouring into the kiln body and directly acting on the porcelain (Jianzhan) to be fired, the heating unit of the present invention also includes a retaining wall 250. The retaining wall 250 is located in the combustion chamber 120 and is directly opposite to the end of the feed pipe 240, blocking the biomass particles ejected from the feed pipe 240 so that they burn in the combustion chamber 120, and then the smoke generated by them enters the kiln body through the smoke gap between the retaining wall 250 and the cavity wall of the combustion chamber 120.

[0045] As a preferred embodiment, the retaining wall 250 is arc-shaped in the top view, and the center of the arc faces the end of the feed pipe 240. A plurality of radial baffles 251 are provided on both sides of the retaining wall 250, and there is a smoke gap between the radial baffles 251 and the cavity wall of the combustion chamber 120. In this way, the arc-shaped design is conducive to the dispersion of biomass particles in the combustion chamber 120, and the design of the radial baffles 251 effectively blocks the biomass particles and prevents them from entering the kiln body under the action of the spray force.

[0046] Correspondingly, the cavity wall of the combustion chamber 120 is provided with an ash cleaning port 121 and an ash scraping port 122 facing the material retaining wall 250, and the ash cleaning port 121 and the ash scraping port 122 are respectively closed by an ash cleaning door 123 and an ash scraping door 124. The size of the ash cleaning port 121 meets the requirements for an adult to probe into, so that the upper body of a person can probe into and clean the accumulated ash on the material retaining wall 250. The ash scraping port 122 is used to clean the accumulated ash.

[0047] In order to obtain greater firepower when rapid heating is required, each ash removal door 124 is provided with a combustion-supporting blower 125, and the air duct of the combustion-supporting blower 125 leads to the ash removal port 122 to blow air into the combustion chamber 120 to assist combustion.

[0048] Please refer to Figure 1 and Figure 2 As shown, the feeding unit includes a guide rail 310 and a silo 320. The guide rail 310 is arranged above the kiln body, and can be a circular guide rail 310 or a parallel guide rail 310. The silo 320 is suspended on the guide rail 310 and moves along the guide rail 310. The silo 320 is filled with biomass particles so as to add material to each hopper 210 when the biomass particles in each hopper 210 are lower than a preset value.

[0049] Please refer to Figure 1 and Figure 2 As shown, the flue gas treatment unit includes a main flue 410, a branch flue 420, a collecting flue 430 and a flue gas treatment device 440. A chimney 160 is provided at the rear of the kiln body to complete the smoke exhaust. The main flue 410 is provided with a main smoke collecting hood 411 covering the chimney 160 to collect the smoke discharged from the chimney 160. The branch flue 420 is provided with an auxiliary smoke collecting hood 421 covering each cleaning door 123. The smoke overflowing from the combustion chamber 120 is collected. One end of the collecting flue 430 is connected with the main flue 410 and the branch flue 420, and the other end leads to the flue gas treatment device 440 to treat the smoke.

[0050] Please refer to Figure 7 As shown, the flue gas treatment device 440 includes a water collecting tank 441, a cyclone processor 442, a sewage filter barrel 443, a first spray rack 444, a submersible pump 445, a flue gas filter barrel 446, a second spray rack 447 and a water curtain spray rack 448.

[0051] The water collecting box 441 includes an overflow chamber 4411, a return water chamber 4412 and an exhaust chamber 4413 in sequence. The overflow chamber 4411 has an overflow pipe 44111 extending into the return water chamber 4412; the smoke inlet 4421 of the cyclone processor 442 is connected to the collecting flue 430, and the dust outlet 4422 of the cyclone processor 442 extends into the overflow chamber 4411 and is sealed by the liquid surface thereof. The cyclone processor 442 is provided with a plurality of cyclone spray heads 4423 facing the direction of the cyclone, and in this embodiment, there are two rows, with four in each row. Each cyclone spray head 4423 is connected to the cyclone spray water pipe 4424 beside the cyclone processor 442 through a connecting pipe.

[0052] In this way, after the flue gas enters the cyclone processor 442, a cyclone is generated. Since the cyclone spray head 4423 is facing the direction of the cyclone, it can fully contact the flue gas and capture large dust particles in the flue gas, and then flow into the overflow chamber 4411 through the air dust outlet 4422. The sewage completes the primary sedimentation in the overflow chamber 4411 to precipitate large dust particles. At the same time, the liquid sealing effect of the water level in the overflow chamber 4411 prevents the flue gas from escaping from the dust outlet 4422. After the overflow chamber 4411 is full of water, it flows into the return water chamber 4412 through the overflow pipe 44111. The sewage filter barrel 443 is located below the overflow pipe 44111 to filter the overflow water of the overflow pipe 44111. The first spray rack 444 is in a multi-layered ring shape, which is sleeved outside the sewage filter barrel 443. The first spray heads 4441 are arrayed on each layer of the ring tube and radially point to the sewage filter barrel 443. In this way, the first spray heads 4441 can reversely flush the sewage filter barrel 443, effectively preventing the holes through which the sewage is filtered from being blocked. In order to prevent the first spray rack 444 itself from causing a filtering burden on the sewage filter barrel 443, the flue gas treatment device 440 also includes a timing valve, which is connected to the first spray rack 444 and opened and closed at a fixed time, so that the first spray rack 444 sprays water intermittently.

[0053] The exhaust pipe 4425 of the cyclone processor 442 extends into the return water chamber 4412, and the smoke filter barrel 446 is sleeved on the exhaust pipe 4425 of the cyclone processor 442. The smoke filter barrel 446 includes a guide part 4461, a filter part 4462 and a slag holding part 4463 in sequence. The guide part 4461 has no filter holes, and a guide 44611 is provided in the guide part 4461. The guide 44611 is in the shape of a conical disk, and the edge of the disk body forms an air groove 44612. A plurality of ribs 44613 guide the smoke to the air groove 44612, so that the smoke passes through the air groove 44612 and moves downward along the barrel wall of the smoke filter barrel 446. The filter part 4462 filters the smoke, and the slag holding part 4463 is screwed under the filter part 4462. A filter screen is provided at the bottom of the slag holding part 4463 to collect dust.

[0054] The second spray rack 447 is in a multi-layer ring shape and is sleeved outside the smoke filter cartridge. Each layer of the ring tube is arrayed with a second spray head 4471 radially pointing to the filter part 4462. In this way, the second spray head 4471 can capture smaller smoke dust on the one hand, and reversely flush the smoke filter cartridge 446 on the other hand to prevent blockage.

[0055] The water curtain spray rack 448 is arranged at the inlet / outlet of the exhaust chamber 4413. It is in the shape of a straight tube, and a third spray head 4481 is arrayed on the straight tube to perform water curtain dust filtering when the smoke is discharged from the water collecting box 441 through the exhaust chamber 4413.

[0056] The submersible pump 445 supplies water to the cyclone spray head 4423 , the first spray rack 444 , the second spray rack 447 and the water curtain spray rack 448 .

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Jianzhan environmental protection dragon kiln, including a kiln body, with a plurality of combustion chambers on both sides of the kiln body, characterized in that: It also includes a plurality of heating units, the heating units including a hopper, a screw feeder, a feeding blower and a conveying pipe; the hopper is used to hold biomass particles, and a mixing chamber is formed below the hopper, the mixing chamber has an air inlet and a discharge pipe, and the air inlet and the discharge pipe are coaxial; the screw feeder is installed in the hopper to convey the biomass particles to the mixing chamber; The air outlet pipe of the feed blower is connected to the air inlet pipe port; the starting end of the feed pipe is connected to the discharge pipe port, and the end thereof is connected to the cavity wall of the combustion chamber; It also includes a smoke treatment unit, which includes a main smoke duct, a collecting smoke duct and a smoke treatment device; a chimney is provided at the rear of the kiln body, and the main smoke duct is provided with a main smoke collecting hood covering the chimney; one end of the collecting smoke duct is connected to the main smoke duct, and the other end leads to the smoke treatment device; The flue gas treatment device comprises a water collecting box, a cyclone processor, a sewage filter barrel, a first spray rack and a submersible pump; the water collecting box comprises an overflow chamber and a return water chamber, the overflow chamber has an overflow pipe extending into the return water chamber; the smoke inlet of the cyclone processor is connected to the collecting flue, the dust outlet of the cyclone processor extends into the overflow chamber box and is sealed by its liquid surface, and the cyclone processor is provided with a plurality of cyclone spray heads facing the direction of the cyclone; the sewage filter barrel is located in the return water chamber to filter the overflow water of the overflow pipe; the first spray rack is multi-layered and annular, and is sleeved outside the sewage filter barrel, and each layer of the annular tubes is arrayed with first spray heads radially pointing to the sewage filter barrel; the submersible pump is located in the return water chamber, and supplies water to the cyclone spray head and the first spray rack; The flue gas treatment device also includes a flue gas filter barrel, a second spray rack and a water curtain spray rack; the exhaust pipe of the cyclone processor extends into the return water chamber, the flue gas filter barrel is sleeved on the exhaust pipe of the cyclone processor, the flue gas filter barrel includes a guide part, a filter part and a slag holding part in sequence, the guide part has no filter holes, a guide is provided in the guide part to guide the flue gas to go down along the barrel wall of the flue gas filter barrel, the slag holding part is screwed under the filter part, and a filter screen is provided at the bottom of the slag holding part; the second spray rack is multi-layered and annular, which is sleeved outside the flue gas filter cartridge, and each layer of the annular tubes is arrayed with a second spray head radially pointing to the filter part; the water collecting tank has an exhaust chamber communicated with the return water chamber, and the water curtain spray rack is arranged at the inlet / outlet of the exhaust chamber; the submersible pump supplies water to the second spray rack and the water curtain spray rack.

2. The Jianzhan environmentally friendly dragon kiln as claimed in claim 1, characterized in that: Along the length direction of the kiln body, the combustion chambers on both sides are staggered.

3. The Jianzhan environmentally friendly dragon kiln according to claim 1, characterized in that: It also includes a material adding unit, which includes a guide rail and a silo. The guide rail is arranged above the kiln body, and the silo is suspended on the guide rail and moves along the guide rail to add material to each hopper.

4. The Jianzhan environmentally friendly dragon kiln according to claim 1, characterized in that: The kiln body is formed by splicing a plurality of sub-kiln bodies on the same reference plane. Along the splicing direction, the base height of each sub-kiln body increases according to a preset gradient, and each sub-kiln body is built of refractory bricks.

5. The Jianzhan environmentally friendly dragon kiln as claimed in claim 1, characterized in that: The heating unit further comprises a material retaining wall, which is located in the combustion chamber and directly opposite to the end of the material conveying pipe, and a smoke-passing gap exists between the material retaining wall and the cavity wall of the combustion chamber.

6. The Jianzhan environmentally friendly dragon kiln as claimed in claim 5, characterized in that: In a top view, the retaining wall is arc-shaped, and a plurality of radial baffles are arranged on both sides of the retaining wall. There is a smoke gap between the radial baffles and the cavity wall of the combustion chamber.

7. The Jianzhan environmentally friendly dragon kiln as claimed in claim 5 or 6, characterized in that: The cavity wall of the combustion chamber is provided with an ash cleaning port and an ash scraping port facing the material retaining wall. The ash cleaning port and the ash scraping port are closed by an ash cleaning door and an ash scraping door. The size of the ash cleaning port meets the requirement for an adult to reach in.

8. The Jianzhan environmentally friendly dragon kiln as claimed in claim 7, characterized in that: The flue gas treatment unit also includes a branch flue; the branch flue is provided with an auxiliary smoke collecting hood covering each cleaning door; one end of the converging flue is merged with the branch flue, and the other end leads to the flue gas treatment device.

Images