Downward flame type kiln body structure of firewood burning dragon kiln

Abstract

The reverse flame type kiln body structure comprises a kiln head, a kiln body and a kiln tail, the kiln body comprises a plurality of firewood burning chambers and kiln chambers which are sequentially and alternately arranged, firewood feeding openings are formed in the side walls of the firewood burning chambers, the firewood burning chambers are separated from the previous kiln chamber through a front kiln wall, the firewood burning chambers are separated from the next kiln chamber through a rear kiln wall, and the kiln tail is connected with the firewood burning chambers. A plurality of circulation channels are formed in the bottom of the front kiln wall in the length direction of the front kiln wall, an air uniformizing hole plate is arranged on the upper portion of the kiln chamber, a reverse flame chamber is arranged between the air uniformizing hole plate and the top of the kiln chamber, and flame passing holes communicating the reverse flame chamber with the firewood burning chamber are machined in the upper portion of the rear kiln wall. In conclusion, the utility model has the advantages that the temperature field in the kiln chamber is uniformly distributed, the ash glaze forming effect is good, and the pottery firing yield can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dragon kiln body structures, in particular to a down-flame kiln body structure of a wood-fired dragon kiln. Background Art

[0002] When a wood-fired dragon kiln is firing porcelain, the flame and smoke from the burning wood enter the firing kiln chamber from the combustion chamber and rush upward to the dome. They are blocked by the dome and drawn by the flue at the bottom of the kiln, and flow downward through the pottery blanks or the kiln tools that carry the pottery blanks. Ashes cover the pottery blanks and transfer heat energy to the pottery blanks, causing the pottery blanks to undergo physical and chemical changes with the molten ash at high temperatures, forming ash glaze and completing sintering. The flame and smoke continue to flow through the fire-absorbing holes at the bottom of the kiln to the flue and are finally discharged from the chimney. Since the flow process of the flame and smoke in the kiln is first upward to the dome and then downward, it is called a downdraft wood-fired dragon kiln.

[0003] Compared with the direct flame type, the downdraft wood-fired dragon kiln prolongs the flow distance and residence time of fireworks in the kiln chamber, and improves the uniformity of the temperature field distribution in the kiln. This fireworks path is very suitable for the firing of ceramics, so it is widely used in ceramic sintering. However, the current downdraft wood-fired dragon kiln still has the following problems in the ceramic firing process: Generally speaking, although the fireworks flow from top to bottom, there is still an uneven distribution problem in the cross section, which leads to uneven distribution of the temperature field in the kiln chamber, and the ashes cannot fall evenly. The ash glaze formation effect of the pottery blanks in various areas of the kiln chamber is inconsistent, which affects the finished product rate of pottery firing. Therefore, it is an objective need to develop a downdraft kiln structure of a wood-fired dragon kiln with uniform temperature field distribution in the kiln chamber, good ash glaze formation effect, and improved finished product rate of pottery firing. Utility Model Content

[0004] The utility model aims to provide a down-flame kiln structure of a wood-fired dragon kiln, which has uniform temperature field distribution in the kiln chamber, good gray glaze forming effect and can improve the finished product rate of pottery.

[0005] The purpose of the utility model is achieved in this way, including a kiln head, a kiln body and a kiln tail, the kiln body including a plurality of firewood burning chambers and kiln chambers arranged alternately in sequence, a firewood throwing port is arranged on the side wall of the firewood burning chamber, the firewood burning chamber and the previous kiln chamber are separated by a front kiln wall, the firewood burning chamber and the subsequent kiln chamber are separated by a rear kiln wall, a plurality of flow channels are arranged at the bottom of the front kiln wall along its length direction, an evenly distributed air hole plate is arranged on the upper part of the kiln chamber, a downdraft chamber is arranged between the evenly distributed air hole plate and the top of the kiln chamber, and a flame hole connecting the downdraft chamber and the firewood burning chamber is processed on the upper part of the rear kiln wall.

[0006] Furthermore, a plurality of flame guide plates are arranged at intervals on the top of the downdraft chamber along the length direction of the kiln chamber, and the height of the lower end surface of the flame guide plate gradually becomes lower.

[0007] Furthermore, a grid plate is provided in the wood-burning chamber above the circulation channel.

[0008] Furthermore, the grid plate divides the wood burning chamber into a combustion chamber and an ash storage chamber. An ash hole is processed on the rear kiln wall on one side of the ash storage chamber. A rotating shaft is arranged in the ash storage chamber, and a stirring rod is arranged on the rotating shaft. One end of the rotating shaft extends out of the outside of the ash storage chamber and is connected to a driving device for transmission.

[0009] Furthermore, a plurality of partitions are arranged in the combustion chamber at intervals along the width direction of the kiln chamber.

[0010] Furthermore, a vertical ash-raising channel connected to the ash-passing hole is provided on the side wall of the rear kiln wall, and the upper end of the ash-raising channel is connected to the downdraft chamber.

[0011] Furthermore, a supporting platform is provided at the bottom of the kiln chamber, and a plurality of downdraft grooves are processed on the surface of the supporting platform. The length direction of the downdraft grooves is parallel to the length direction of the kiln chamber, and the depth of the downdraft grooves gradually deepens along the airflow direction.

[0012] When the utility model is in use, firewood is thrown into the firewood burning chamber at the kiln head position from the firewood throwing port, and the flame and smoke generated by the burning of the firewood flow upward, and after reaching the top of the firewood burning chamber, they flow into the downdraft chamber under the suction of the chimney, and then flow downward, and are diverted when passing through the uniform air hole plate, so that the flame and smoke can flow downward evenly, ensuring that the ashes can be evenly covered on the surface of the pottery blank, and at the same time, heat can be evenly transferred to the pottery blank, and then the flame and smoke are evenly passed into the next firewood burning chamber from the circulation channel, and so on, the firewood burns in each firewood burning chamber to generate flame and smoke, and the generated flame and smoke carry the ashes into the next kiln chamber, completing the firing of the pottery blanks in all the kiln chambers to obtain finished pottery. In the utility model, by setting the down-flame chamber and the uniform air hole plate, on the one hand, the flame and the smoke can flow from top to bottom in the kiln chamber, so as to realize the down-flame firing of the ceramic blanks. Compared with the straight-flame structure, the flow distance and residence time of the flame and the smoke in the kiln chamber are prolonged. At the same time, the uniform air hole plate can make the flame and the smoke flow downward evenly, so that the flame and the smoke can be evenly distributed on the cross section of the kiln chamber, which can improve the uniformity of the temperature field distribution in the kiln chamber, ensure that the ceramic blanks located in various parts of the kiln chamber can obtain a good firing effect, and the ashes can also fall evenly on the ceramic blanks in various parts of the kiln chamber, so as to improve the consistency of the gray glaze forming effect of the ceramic blanks in various areas of the kiln chamber, which can not only improve the gray glaze forming effect, but also improve the ceramic blanks. In addition, when using the traditional dragon kiln to fire pottery, the flame and smoke generated continuously move toward the chimney, the temperature continuously decreases, and the ash content carried continuously decreases, so that the pottery fired in the kiln chamber closer to the chimney has poorer quality and the ash glaze effect formed is also poorer. In the utility model, the firewood burning chamber and the kiln chamber are alternately arranged, that is, a corresponding firewood burning chamber is arranged in front of each kiln chamber, and firewood is put into the corresponding firewood burning chamber for burning. On the one hand, the flame and smoke temperature can be increased, and on the other hand, new ash can be generated to facilitate the formation of ash glaze, so that the kiln chambers located at various positions of the kiln body have temperatures and ash that meet the firing of pottery, thereby improving the firing quality of pottery and the formation effect of ash glaze. In summary, the utility model has the advantages of uniform temperature field distribution in the kiln chamber, good ash glaze formation effect, and can improve the finished product rate of pottery firing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic structural diagram of the front kiln wall 5 in the utility model;

[0015] Figure 3 It is a schematic diagram of the top view of the partition plate 17 of the utility model;

[0016] Figure 4 It is a schematic diagram of the top view of the supporting platform 19 in the utility model;

[0017] In the figure: 1-kiln body, 2-firewood burning chamber, 3-kiln chamber, 4-firewood feeding port, 5-front kiln wall, 6-rear kiln wall, 7-circulation channel, 8-evening air hole plate, 9-down flame chamber, 10-flame hole, 11-flame guide plate, 12-grid plate, 13-combustion chamber, 14-ash storage chamber, 15-ash hole, 16-stirring rod, 17-partition, 18-ash supply channel, 19-carrying platform, 20-down flame trough. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the present invention belong to the protection scope of the present invention.

[0019] like Figures 1 to 4 As shown, the utility model comprises a kiln head, a kiln body 1, a kiln tail and a chimney which are connected in sequence. The kiln body 1 comprises a plurality of firewood burning chambers 2 and kiln chambers 3 which are arranged alternately in sequence. A firewood insertion opening 4 is arranged on the side wall of the firewood burning chamber 2. The firewood burning chamber 2 and the previous kiln chamber 3 are separated by a front kiln wall 5, and the firewood burning chamber 2 and the subsequent kiln chamber 3 are separated by a rear kiln wall 6. A plurality of flow channels 7 are arranged at the bottom of the front kiln wall 5 along its length direction. An air-distributing orifice plate 8 is arranged on the upper part of the kiln chamber 3. The air-distributing orifice plate 8 is an existing structure so that flame and smoke can flow downward evenly. A downdraft chamber 9 is arranged between the air-distributing orifice plate 8 and the top of the kiln chamber 3. A flame-through hole 10 which connects the downdraft chamber 9 and the firewood burning chamber 2 is processed on the upper part of the rear kiln wall 6.

[0020] When the utility model is in use, firewood is thrown into the firewood burning chamber 2 at the kiln head position from the firewood throwing port 4, and the flame and smoke generated by the burning of the firewood flow upward, and after reaching the top of the firewood burning chamber 2, they flow into the downdraft chamber 9 under the suction force of the chimney, and then flow downward, and are diverted when passing through the uniform air hole plate 8, so that the flame and smoke can flow downward evenly, ensuring that the ashes can be evenly covered on the surface of the pottery blank, and at the same time, the heat can be evenly transferred to the pottery blank, and then the flame and smoke are evenly passed into the next firewood burning chamber 2 from the circulation channel 7, and so on, the firewood burns in each firewood burning chamber 2 to generate flame and smoke, and the generated flame and smoke carry the ashes into the next kiln chamber 3, completing the firing of the pottery blanks in all the kiln chambers 3 to obtain finished pottery. In the present invention, by setting the downflame chamber 9 and the uniform air hole plate 8, on the one hand, the flame and the smoke can flow from top to bottom in the kiln chamber 3, so as to realize the downflame firing of the ceramic blanks. Compared with the straight flame structure, the flow distance and residence time of the flame and the smoke in the kiln chamber 3 are prolonged. At the same time, the uniform air hole plate 8 can make the flame and the smoke flow downward evenly, so that the flame and the smoke can be evenly distributed on the cross section of the kiln chamber 3, which can improve the uniformity of the temperature field distribution in the kiln chamber 3, ensure that the ceramic blanks located in various parts of the kiln chamber 3 can obtain a good firing effect, and the ashes can also fall evenly on the ceramic blanks in various parts of the kiln chamber 3, thereby improving the consistency of the gray glaze forming effect of the ceramic blanks in various areas of the kiln chamber 3, which can not only improve the gray glaze forming effect, but also improve High pottery firing yield; in addition, when using a traditional dragon kiln to fire pottery, the flame and smoke generated continuously move toward the chimney, the temperature continuously decreases, and the ash content carried continuously decreases, so that the pottery fired in the kiln chamber 3 closer to the chimney is of poorer quality and the ash glaze effect formed is also poorer. In the utility model, a firewood burning chamber 2 and a kiln chamber 3 are alternately arranged, that is, a corresponding firewood burning chamber 2 is provided in front of each kiln chamber 3, and firewood is put into the corresponding firewood burning chamber 2 for combustion, which can increase the flame and smoke temperature on the one hand, and generate new ash to facilitate the formation of ash glaze on the other hand, so that the kiln chamber 3 located at various positions of the kiln body has a temperature and ash that meet the pottery firing, thereby improving the firing quality of pottery and the ash glaze formation effect.

[0021] A plurality of flame guide plates 11 are arranged at intervals on the top of the downdraft chamber 9 along the length direction of the kiln chamber 3, and the height of the lower end surface of the flame guide plate 11 gradually decreases along the airflow direction. Firewood burns in the firewood burning chamber 2 to generate flames and smoke, which enter the downdraft chamber 9 from the flame holes 10. Part of the flames and smoke are easily retained at the top of the downdraft chamber 9, and the flames and smoke falling from the downdraft chamber 9 also have the problem of uneven temperature field distribution. In order to solve this problem, a plurality of flame guide plates 11 of different heights are arranged to promote the downward flow of flames and smoke and improve the uniformity of temperature field distribution in the kiln chamber 3.

[0022] A grid plate 12 is arranged in the firewood burning chamber 2 above the circulation channel 7. The grid plate 12 is an existing structure. A through hole is arranged on the grid plate 12 for ashes to fall. When the utility model is in operation, firewood is thrown from the firewood throwing port 4, and the firewood falls on the grid plate 12 for combustion. The smoke exhausted from the previous kiln chamber 3 passes under the grid plate 12 and flows upward from the bottom of the grid plate 12 to promote the combustion of the firewood at the bottom of the firewood pile. A part of the ashes produced after combustion flows to the next kiln chamber 3 with the smoke flow, and the remaining part can usually fall from the through hole to prevent the accumulation of ashes from affecting the full combustion of the firewood.

[0023] The grid plate 12 divides the wood burning chamber 2 into a combustion chamber 13 and an ash storage chamber 14. An ash hole 15 is processed on the rear kiln wall 6 on one side of the ash storage chamber 14. A rotating shaft is arranged in the ash storage chamber 14, and a stirring rod 16 is arranged on the rotating shaft. One end of the rotating shaft extends out of the ash storage chamber 14 and is connected to a driving device for transmission. Considering the need for a large or small amount of ash when the ash glaze of the ceramic blank is formed, the rotating shaft can be driven to rotate by a driving device within a specific time period. The driving device can use a motor and a transmission. The rotating shaft drives the stirring rod 16 to rotate. When the stirring rod 16 rotates, the ash falling in the ash storage chamber 14 is lifted up, and then driven by part of the smoke, it enters the subsequent kiln chamber 3 through the ash hole 15, increasing the ash content in the kiln chamber 3, meeting the need for the amount of ash for the formation of ash glaze, and improving the formation effect of the ceramic blank ash glaze.

[0024] A plurality of partitions 17 are arranged at intervals along the width direction of the kiln chamber 3 in the combustion chamber 13. Firewood burns in the combustion chamber 13, and the flames and smoke generated flow upward, but the rising flames and smoke have the problem of uneven temperature field distribution, and then enter the downdraft chamber 9, and there is also the problem of uniform temperature field distribution. In order to solve this problem, partitions 17 are arranged, and air flow channels are formed between the partitions 17 and the partitions 17, thereby diverting the rising flames and smoke, so that the temperature field of the flames and smoke can be evenly distributed in the downdraft chamber 9, and finally flow evenly downward to the pottery, thereby improving the uniformity of the temperature field distribution of the flames and smoke in the kiln chamber 3 and improving the firing quality of the ceramics.

[0025] The side wall of the rear kiln wall 6 is provided with an upper ash channel 18 which is connected to the ash hole 15 and is vertically arranged, and the upper end of the upper ash channel 18 is connected to the downdraft chamber 9. After the ash is passed into the kiln chamber 3 from the ash hole 15, it flows from one side of the kiln chamber 3 to the other side, and is in a flat flow state as a whole, so that the surface of the pottery blank facing the ash side is covered with more ash, while the surface of the pottery blank facing away from the ash side is covered with less ash, resulting in the problem of poor ash glaze formation effect of the pottery. In order to solve this problem, the ash flowing out of the ash storage chamber 14 is poured into the downdraft chamber 9 through the upper ash channel 18, so that these ashes can be mixed into the flue gas, and fall evenly with the flue gas, and finally evenly cover the surface of the pottery blank, thereby improving the ash glaze formation effect and the firing finished product rate of the pottery.

[0026] A support platform 19 is provided at the bottom of the kiln chamber 3, and a plurality of downdraft grooves 20 are processed on the surface of the support platform 19. The length direction of the downdraft grooves 20 is parallel to the length direction of the kiln chamber 3, and the depth of the downdraft grooves 20 gradually deepens along the airflow direction. The support platform 19 is a prior art, and is used for placing the rack and the pottery blank. In the utility model, the flame, smoke and ash flow from top to bottom in the kiln chamber 3, the flame and smoke heat the pottery blank, and the ash falls on the surface of the pottery blank, thereby completing the firing of the pottery blank. Subsequently, the flame, smoke and remaining ash flow into the downdraft groove 20 and flow along the downdraft groove 20. Since the depth of the downdraft groove 20 gradually deepens along the airflow direction, that is, the downdraft groove 20 is in an inclined state, it is convenient for the ash to flow in the downdraft groove 20. At the same time, when the smoke flows in the downdraft groove 20, the ash can also be blown to prevent the ash from accumulating in the downdraft groove 20 and causing blockage.

Claims

1. A downdraft kiln structure of a wood-fired dragon kiln, comprising a kiln head, a kiln body (1), a kiln tail and a chimney connected in sequence, characterized in that The kiln body (1) comprises a plurality of firewood burning chambers (2) and kiln chambers (3) which are arranged alternately in sequence, a firewood insertion opening (4) is arranged on the side wall of the firewood burning chamber (2), the firewood burning chamber (2) and the previous kiln chamber (3) are separated by a front kiln wall (5), and the firewood burning chamber (2) and the next kiln chamber (3) are separated by a rear kiln wall (6), a plurality of flow channels (7) are arranged at the bottom of the front kiln wall (5) along its length direction, an air distribution plate (8) is arranged at the top of the kiln chamber (3), a downdraft chamber (9) is arranged between the air distribution plate (8) and the top of the kiln chamber (3), and a flame hole (10) which connects the downdraft chamber (9) and the firewood burning chamber (2) is processed at the top of the rear kiln wall (6).

2. The downdraft kiln structure of a wood-fired dragon kiln according to claim 1 is characterized in that A plurality of flame guide plates (11) are arranged at intervals on the top of the downdraft chamber (9) along the length direction of the kiln chamber (3), and the height of the lower end surface of the flame guide plate (11) gradually decreases along the airflow direction.

3. The downdraft kiln structure of a wood-fired dragon kiln according to claim 1 is characterized in that A grid plate (12) is provided in the firewood burning chamber (2) above the circulation channel (7).

4. The downdraft kiln structure of a wood-fired dragon kiln according to claim 3 is characterized in that The grid plate (12) divides the wood burning chamber (2) into a combustion chamber (13) and an ash storage chamber (14). An ash hole (15) is formed on the rear kiln wall (6) on one side of the ash storage chamber (14). A rotating shaft is arranged in the ash storage chamber (14), and a stirring rod (16) is arranged on the rotating shaft. One end of the rotating shaft extends out of the outside of the ash storage chamber (14) and is connected to a driving device.

5. The downdraft kiln structure of a wood-fired dragon kiln according to claim 4, characterized in that A plurality of partition plates (17) are arranged in the combustion chamber (13) at intervals along the width direction of the kiln chamber (3).

6. The downdraft kiln structure of a wood-fired dragon kiln according to claim 4, characterized in that An upper ash passage (18) which is in communication with the ash passage hole (15) and is vertically arranged is provided on the side wall of the rear kiln wall (6), and the upper end of the upper ash passage (18) is in communication with the downdraft chamber (9).

7. The downdraft kiln structure of a wood-fired dragon kiln according to claim 1, characterized in that A support platform (19) is arranged at the bottom of the kiln chamber (3), and a plurality of downflame grooves (20) are processed on the surface of the support platform (19). The length direction of the downflame grooves (20) is parallel to the length direction of the kiln chamber (3), and the depth of the downflame grooves (20) gradually increases along the airflow direction.

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