JP2010271002A - Wood-fired kiln for ceramic art - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a climbing kiln and a hole type kiln capable of suppressing generation of smoke and preventing failure of finishing of baking of ceramics. <P>SOLUTION: A high and wide secondary combustion chamber 20 including an intermediate wall 21 arranged in the middle is provided in flues 15a, 15b of the climbing kiln 1. A burner 22 is installed immediately before the upstream side of the intermediate wall 21. The burner 22 can be used as a blower for stopping fuel (gas, kerosene and the like) and blowing only air, and is installed within the secondary combustion chamber 20 so as to enable advance/retract itself. A grate 23 and a temperature sensor 24 are installed on the upper side of the intermediate wall 21 of the secondary combustion chamber 20. A partition wall 26 is installed in the vicinity of an inlet 25 of the secondary combustion chamber 20. Gas generated by secondary combustion is interrupted by the partition wall 26, sucked by an air current generated by an air blower 30 within a chimney and discharged without flowing back. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wood kiln that fires ceramics, and more particularly to a climbing kiln and an anagama.

  For a long time, kilns using firewood such as a hole kiln and climbing kiln have been used for firing ceramics. In recent years, ceramic kilns that use gas, heavy oil, etc. as a fuel are common, but so-called kiln changes (unexpectedly good ceramics are fired) can be expected. However, there is a high need for wood kilns among potters.

From these expectations, recently, small firewood kilns (Patent Document 1), climbing kilns that can suppress the generation of dioxins even when using woody industrial waste (Patent Document 2), small and movable, can remove soot and smoke. A proposal such as a firewood kiln (Patent Document 3) has been made.
JP 2004-245433 A JP 2003-2732 A JP 2007-24374 A

  However, in the small kiln with a single firing chamber as proposed in Patent Documents 1 and 3, even if the effect of natural firewood can be expressed, the kiln change due to the difference between oxidation firing and reduction firing is systematically developed. There is a problem that it cannot fully meet the demands of ceramic artists.

  In that respect, Patent Document 2 is a climbing kiln, which meets the demands of potters. As shown in FIG. 5, this patent document 2 is provided with a secondary combustion chamber 7 provided with a burner 8 at the outlet of the primary combustion chamber 3 that accommodates the ceramic to be baked. Combustion raises the secondary combustion chamber 7 to 800 ° C. or higher, and when the temperature of the primary combustion chamber 3 reaches 800 ° C. or higher, the combustion of the burner 8 is stopped to prevent generation of dioxins. is suggesting. It has also been proposed to install an ejector blower 6 in the chimney 5 to perform forced exhaust.

  Certainly, it is well known in various incinerators that the method of recombusting the flue gas by providing a secondary combustion chamber is effective in preventing the scattering of harmful substances. However, in the climbing kiln, the combustion state of the secondary combustion chamber has an influence on the temperature in the firing chamber, and there is a risk of causing a malfunction in the firing of the ceramic in the firing chamber where the kiln change due to reduction firing is expected. .

  Therefore, an object of the present invention is to provide an ascending kiln and a hole kiln that not only suppress the generation of smoke but also do not cause defects in the baking of ceramics.

The ceramic firewood kiln of the present invention, which has been made to achieve the above object, includes a firing chamber configured such that the floor surface gradually rises from the firing port to the flue, and smoke is emitted from the end of the firing chamber. A firewood kiln configured to exhaust smoke from a chimney installed via a road and also provided with a temperature sensor for detecting the temperature in the firing chamber, characterized in that it has the following configuration.
(1) A damper that opens and closes the flue and that can set the opening degree at an intermediate opening degree is provided.
(2) A burner that blows fuel and air in a direction crossing the flue is installed at a position downstream of the damper, and a cross-sectional area larger than that of the flue is installed in a portion where the burner is installed A secondary combustion chamber must be formed.
(3) A partition wall is provided between the blowing position by the burner and the damper, and the exhaust gas from the firing chamber flows around the partition wall and flows into the secondary combustion chamber.
(4) At the lower part of the chimney, a blower that blows air obliquely upward and capable of adjusting the air volume is installed.
(5) The secondary combustion chamber is taller than the flue, an intermediate wall is erected at the rear position of the burner, and the airflow in the secondary combustion chamber rises from the blowing position by the burner , It is structured to descend over the intermediate wall and to be discharged to the rear flue.
(6) The burner should be usable as a blower that stops fuel and blows only air.
(7) A temperature sensor that is installed at a position behind the intermediate wall of the secondary combustion chamber and detects the temperature in the secondary combustion chamber is provided.

  According to the ceramic kiln of the present invention, the flue gas discharged from the firing chamber flows from the flue into the secondary combustion chamber. The amount of smoke is adjusted by the opening of the damper. In addition, the flue gas goes around the partition wall when flowing into the secondary combustion chamber. In the secondary combustion chamber, the burner is driven and fuel and air are blown together at the beginning. Thereby, the unburned component in flue gas is subjected to secondary combustion. Although the gas pressure rises by this secondary combustion, the backflow to the firing chamber side is suppressed by the presence of the partition wall. Also, the combustion gas generated in the secondary combustion chamber rises so as to get over the intermediate wall and flows to the back side of the intermediate wall. That is, the effect of preventing the backflow by taking up a sufficiently large volume in the secondary combustion chamber is exhibited, and the effect of preventing the backflow is further enhanced by flowing to the back side of the intermediate wall. And it can assist that the combustion gas in a secondary combustion chamber flows out to a chimney by driving an air blower and producing an updraft in a chimney. As a result, the gas in the secondary combustion chamber can be stably caused to flow smoothly in the discharge direction from the chimney without suppressing expansion due to the secondary combustion. As a result, purifying soot by secondary combustion can prevent exhaust of black smoke from the chimney and prevent backflow of combustion gas from the secondary combustion chamber to the firing chamber. The problem of fluctuations is also eliminated.

  Also, as a burner operation method, first, fuel and air are blown from the burner to start secondary combustion, and when the temperature in the firing chamber and the secondary combustion chamber rises to about 800 ° C, the fuel injection is stopped. And used as a blower that blows out only air. The unburned components in the flue gas are ignited and burned spontaneously by supplying sufficient air after the temperature of the firing chamber and the secondary combustion chamber has sufficiently increased. As a result, it is possible to keep the fuel to the minimum required amount and to sufficiently continue the secondary combustion. Also, the air blown by the blower function is prevented from flowing back to the firing chamber side by the partition wall. The detection results of the temperature sensors installed in the firing chamber and secondary combustion chamber are used to determine the timing of function switching of the burner, enabling reliable switching operation instead of relying on intuition. be able to. By increasing the air volume at the initial stage of the start of combustion, the blower can sufficiently exhibit the smoke exhausting function even if the damper opening is minimized. By minimizing the opening degree of the damper, it is possible to accurately raise the temperature and maintain the temperature of the firing chamber, and to exert the effect of preventing the backflow of the secondary combustion gas. In addition, it is desirable to use an operation method in which the air volume of the blower is adjusted so that the temperature rise in the baking chamber is suitable for the purpose.

In addition, about the structure of (6), it can also be changed as follows.
(6 ′) A blower that blows air into the fuel blowing position by the burner between the partition wall and the intermediate wall when the burner is stopped is separately provided.

These pottery kilns for ceramics may further have the following configuration.
(8) A water spray chamber is formed between the secondary combustion chamber and the chimney, and a water spray nozzle is installed on the ceiling of the water spray chamber.
(9) A temperature sensor for detecting the temperature in the chimney above the blower inlet of the blower is provided.

  When the temperature in the vicinity of the chimney exit is high, the water spray can be performed to reduce the temperature of the exhaust gas and to minimize the influence on the environment.

Another type of the pottery kiln for ceramics according to the present invention, which has also been made to achieve the above object, includes a baking chamber configured so that the floor surface gradually rises from the outlet to the flue, and the baking A firewood kiln configured to exhaust smoke from a chimney installed through a flue from the end of the chamber, and also equipped with a temperature sensor for detecting the temperature in the firing chamber, and having the following configuration Features.
(11) A damper that opens and closes the flue and that can set an opening degree at an intermediate opening degree is provided.
(12) A burner is provided in the chimney to blow the fuel together with the air obliquely upward.
(13) The outlet from the burner is opened above the flue opening in the chimney.
(14) In the chimney, a horizontal partition member with a slit is installed at a position away from the outlet by a predetermined distance in consideration of the fuel injection distance from the burner.
(15) The chimney is provided with a blower that blows air obliquely upward from a position above the horizontal partition member and capable of adjusting the air volume.
(16) The burner should be usable as a blower that stops fuel and blows only air.
(17) A temperature sensor for detecting the temperature in the chimney near the installation position of the horizontal partition member is provided.

  This type of pottery kiln for pottery is effective when the flue is short in an existing climbing kiln or anataki kiln. That is, a secondary combustion chamber is formed in the chimney by (12) and (14), and the flow of secondary combustion gas is made smooth by preventing the backflow by the configuration of (13) and the configuration of (15). Thus, fluctuations in the firing environment of the firing chamber can be suppressed while performing secondary combustion.

In addition, about the structure of (16), it can also be changed as follows.
(16 ′) A blower for blowing air from the outlet of the burner when the burner is stopped is separately provided.

In addition, this type of pottery kiln for ceramics may further include the following configuration.
(18) A water spray nozzle for spraying water in the horizontal direction in the chimney is installed between the horizontal partition member and the blower inlet of the blower.
(19) A temperature sensor for detecting the temperature in the chimney above the blower inlet of the blower is provided.

  According to the present invention, it is possible to provide an ascending kiln or a hole kiln that not only suppresses the generation of smoke but also does not cause defects in the baking of the ceramic.

1 is a cross-sectional view showing the structure of a climbing kiln of Example 1. FIG. 6 is a cross-sectional view showing the structure of a climbing kiln of Example 2. FIG. 6 is a cross-sectional view showing the structure of a climbing kiln of Example 3. FIG. It is sectional drawing which shows the structure of the hole kiln of Example 4. FIG. It is explanatory drawing of a prior art.

  Hereinafter, specific examples will be described in detail with reference to the drawings as embodiments of the present invention.

  As shown in FIG. 1, the climbing kiln 1 according to the first embodiment includes a plurality of (three in the embodiment) firing chambers 12 to 14 that are continuously provided with a gradually increasing gradient from the bottom opening 11. This is a wood kiln configured to direct smoke from the final stage firing chamber 14 to the chimney 16 via the flue 15a, 15b and to perform smoke exhaust.

  The flue 15a is provided with a damper 17 for opening and closing. The damper 17 has a structure that can be held not only at the fully open position and the fully closed position but also at an intermediate opening position. The damper 17 continues firing at the minimum intermediate opening required for flue gas having a gap with the floor surface of about several cm to 5 cm from the beginning of firing, and is fully closed when the kiln is finished. At the end of the kiln burning, the burning mouth 11 is also closed.

  A secondary combustion chamber 20 is installed between the flues 15 a and 15 b so as to be located downstream of the damper 17. The secondary combustion chamber 20 is taller and wider than the flue 15a, 15b, and has an intermediate wall 21 in the middle. Immediately before the upstream side of the intermediate wall 21, a burner 22 for blowing fuel and air in a direction crossing the flues 15a and 15b is installed.

  This burner 22 can be used as a blower that stops fuel (gas or kerosene) and blows in only air, and can itself move in the direction of entering and retracting into the secondary combustion chamber 20. is set up. A roster 23 made of refractory bricks with slits is installed on the upper part of the intermediate wall 21 of the secondary combustion chamber 20. A temperature sensor 24 is installed at a position corresponding to the upper part of the rooster 23 on the downstream side of the intermediate wall 21. The temperature sensor 24 measures the temperature in the secondary combustion chamber so that the state of secondary combustion can be observed from the temperature side. A temperature sensor 14a is also installed in the final firing chamber 14 so that the temperature in the firing chamber can be measured.

  In addition, a partition wall 26 is installed in the vicinity of the inlet 25 of the secondary combustion chamber 20 so as to partition the blowing position by the burner 22 and the inlet 25. As a result of the presence of the partition wall 26, the smoke discharged from the firing chamber 14 passes through the flue 15a, enters the secondary combustion chamber 20 from the inlet 25, and wraps around and above the partition wall 22 to burner. It is set as the structure which flows in into the blowing position by 22.

  In addition, a blower 30 that blows air obliquely upward is installed below the chimney 16. This blower 30 is capable of adjusting the air volume, and is driven during firing to generate an ascending air flow in the chimney 16 to assist the smooth exhaust of smoke from the flue 15b. In particular, by increasing the amount of air at the start of firing, the smoke is smoothly drawn out to the secondary combustion chamber 20 through the gap of the damper 17 installation section which is only a few centimeters above the floor, and the ventilation of the firing chambers 11 to 14 is performed. By increasing the size, it also plays a role in activating the burning of soot. In addition, when the air volume of this air blower 30 is too large, the temperature rise of the baking chamber 14 may be prevented. Therefore, the air volume of the blower 30 is adjusted based on the temperature detection value of the temperature sensor 14a installed in the baking chamber 14, and control is performed to change the baking chamber temperature in a state suitable for the purpose. As a result of being able to adjust the air volume by the blower 30 and the firing chamber temperature sensor 14a, firing can be performed while the damper 17 is kept at the minimum opening degree from the start of firing. Minimizing the opening degree of the damper 17 also helps to prevent the backflow of the secondary combustion gas.

  The climbing kiln 1 of Example 1 starts burning after pouring the kiln and throwing in the soot from the soot 11. At this time, the damper 17 is set so as to form an opening having a height of about 5 cm from the bottom of the flue at the intermediate opening position, and the blower 30 is driven to generate an updraft in the chimney 16. Since the blower 30 exhibits the action of sucking the smoke in the flue 15a, 15b, the damper 17 can be lowered to a position where a slight opening is formed.

  As a result, the smoke generated in the first firing chamber 11 due to the burning of soot goes out to the flue 15a while filling the inside of the first firing chamber 12, the second firing chamber 13, and the third firing chamber 14. The smoke that has flowed out to the flue 15a flows between the partition wall 26 and the intermediate wall 21 of the secondary combustion chamber 20 so as to wrap around and on the partition wall 26.

  At this time, the burner 22 is advanced between the partition wall 26 and the intermediate wall 21 to blow fuel and air. As a result, the unburned matter (smoke component) in the smoke flowing out between the partition wall 26 and the intermediate wall 21 is ignited, and secondary combustion is executed.

  The gas generated by the secondary combustion rises along the intermediate wall 21, wraps around the intermediate wall 21 at the ceiling portion of the secondary combustion chamber 20 and descends backward, passes through the subsequent flue 15b. And sucked into the chimney 16. At this time, the presence of the rooster 23 weakens the momentum of the gas flowing into the chimney 16, and the unburned components in the gas ignite spontaneously when passing through the slit of the heated rooster 23, Subsequent combustion is more reliably performed.

  About 5 to 10 minutes after confirming the state in which the temperature of the firing chamber 14 and the secondary combustion chamber 20 reaches 800 ° C. and the secondary combustion is stably performed based on the detection values of the temperature sensors 14 a and 24. After the elapse of time, the burner 22 is moved backward, the fuel ejection is stopped, and only air is blown. Since the inside of the secondary combustion chamber 20 is already maintained at the ignition temperature of the unburned components in the soot, the secondary combustion in the secondary combustion chamber 20 is maintained by blowing air. By reversing the burner 22, it becomes difficult to cause turbulence in the air flow in the secondary combustion chamber 20 due to air blowing when functioning as a blower. As a result, a large amount of air sufficient for secondary combustion can be blown into the secondary combustion chamber 20.

  In this way, the firing is advanced, and when the temperature of each of the firing chambers 12 to 14 reaches the predetermined temperature and a predetermined time has elapsed, the firing port 11 is closed, the damper 17 is fully closed, and the burner 22 and the blower 30 are stopped. In this way, it is left for 1 to several days while maintaining the temperature in the kiln, and after the entire kiln has cooled, the kiln is opened and the baked ceramic is taken out.

  According to the present embodiment, the smoke discharged from the chimney 16 by the secondary combustion in the secondary combustion chamber 20 does not include colorless and transparent soot. By the way, while each firing chamber 12-14 is empty, the soot is introduced from the firing port 11, and the combustion is performed for about 60 minutes, during which “no secondary combustion” and “with secondary combustion” In this case, when the amount of soot discharged from the chimney 16 was measured, it was 0.031 g / m3N in the case of “no secondary combustion”, but 0.0025 g / m3N by performing secondary combustion. It has been confirmed by the applicant's experiment that the amount of dust is 1/10 or less.

  Further, even when secondary combustion that is highly effective in removing such dust is performed, a partition wall 26 is installed immediately after the inlet 25 of the secondary combustion chamber 20, and the rooster 23 is placed behind the intermediate wall 21. Since the opening degree of the damper 17 is reduced by forcibly generating an updraft in the chimney 16 with the blower 30, the gas expanded by the secondary combustion does not flow back to the firing chamber 14. . Therefore, even if the combustion in the secondary combustion chamber is activated, the firing environment of the firing chamber 14 is not changed, and the baked ceramic is not adversely affected. Moreover, since the temperature of the firing chamber 14 is adjusted by the air volume of the blower 30, the opening degree of the damper 17 can be kept at the same opening degree from the start of firing to the end of the kiln. As a result, the distribution environment of the flue gas between the firing chamber 14 and the secondary combustion chamber 20 can be kept constant, and both the temperature control of the firing chamber and the secondary combustion can be stably achieved.

  As shown in FIG. 2, the climbing kiln 2 of the second embodiment has substantially the same configuration as that of the climbing kiln 1 of the first embodiment, but the following configuration is added. That is, a water spray chamber 40 is provided immediately after the secondary combustion chamber 20, and temperature sensors 32 and 33 for detecting the temperature in the chimney below and above the inlet 31 of the blower 30 are provided.

  The water spray chamber 40 is configured as a room having an intermediate wall 41 in the middle and a water spray nozzle 42 in the center of the ceiling.

  In the present embodiment, when the exhaust gas temperature is equal to or higher than a predetermined temperature based on the temperature detected by the temperature sensors 32 and 33, the water spray nozzle 42 can be operated to cool the exhaust gas by water spray. Thereby, the temperature of the exhaust from the chimney 16 can be lowered, and the influence on the environment in terms of the exhaust temperature can be suppressed to the minimum. In addition, water spray also exhibits the effect | action which removes the nitrogen oxide etc. in exhaust_gas | exhaustion.

  Also in the second embodiment, even if the combustion in the secondary combustion chamber is activated, the firing environment of the firing chamber 14 is not changed, and the effect of not adversely affecting the baked ceramics. Is exhibited in the same manner as in the first embodiment. .

  As shown in FIG. 3, the climbing kiln 3 according to the third embodiment differs from the first and second embodiments in that the flue 15 does not include a secondary combustion chamber. Instead, a burner 51 that blows fuel together with air obliquely upward is installed below the chimney 16. The outlet 52 from the burner 51 is opened above the flue opening 16 a in the chimney 16. In consideration of the fuel blowing distance from the burner 51, a slitted rooster 53 is installed at a position away from the blowing port 52 by a predetermined distance. Thereby, the space in the chimney between the outlet 52 of the burner 51 and the rooster 53 becomes the secondary combustion chamber 50 in the present embodiment. The burner 51 can be used as a blower that stops fuel and blows only air. In addition, the rooster 53 is installed in the position where it is beaten when the flame comes out from the burner 51. As a result, after the fuel injection from the burner 51 is stopped, spontaneous combustion occurs in the unburned components in the soot that has obtained the blower air when passing through the slit of the heated rooster 53, and the secondary combustion continues. Is done.

  In addition, a blower 55 is installed in the chimney 16 so as to blow air obliquely upward from a position above the rooster 53. Temperature sensors 57 and 58 are installed in the vicinity of the lower portion of the rooster 53 and in the vicinity of the upper portion of the blowout port 56 of the blower 55, respectively, and a water spray nozzle that sprays water horizontally between the blower 55 and the rooster 53. 59.

  When the ascending kiln 3 of the third embodiment starts to fire the kiln, the blower 55 is driven to generate an ascending air flow in the chimney 16 so that the smoke from the chimney 15 is smoothly drawn into the chimney 16. . Then, the smoke drawn into the chimney 16 drives the burner 51 to blow in fuel and air for secondary combustion, and burns unburned soot. Further, the temperature of the rising exhaust gas is cooled by operating the water spray nozzle 59 and components such as nitrogen oxides are removed. Then, after confirming that the temperature inside the secondary combustion chamber 50 has risen to a temperature at which spontaneous combustion is possible and stabilized by the temperature sensor 57 installed immediately below the rooster 53, the burner 51 stops the fuel. Switch to a state where only ventilation is performed.

  As described above, it is possible to suppress the influence of exhaust heat on the environment by lowering the temperature of the exhaust while removing the smoke in the kiln by secondary combustion. Further, since the blowout from the burner 51 into the chimney 16 is performed obliquely upward and is assisted by the rising air flow generated by the blower 55, the secondary combustion gas generated in the chimney is , It does not flow back to the flue 15 side and does not affect the environment of the firing chamber 14 or the like.

  Example 4 is an example in which the present invention is applied to a hole kiln 4 having a single firing chamber. As shown in FIG. 4, the configuration ahead of the flue 15 has the same configuration as that of the climbing kiln 3 of Example 3 except that the water spray nozzle 59 is not provided. However, the firing chamber 62 in which the floor surface is formed with a gradient gradually rising from the firing port 61 does not have a partition in the middle like the climbing kilns 1 to 3, and has a structure of only one firing chamber.

  Also in the hole kiln 4 of the fourth embodiment, when starting to fire the kiln, the blower 55 is driven to generate an updraft in the chimney 16 so that the smoke from the flue 15 is smoothly drawn into the chimney 16. To do. Then, the smoke drawn into the chimney 16 drives the burner 51 to blow in fuel and air for secondary combustion, and burns unburned soot. The detected values of the temperature sensor 62a installed in the secondary combustion chamber 62 and the temperature sensor 57 installed immediately below the rooster 53 are both 800 ° C. or higher, and the temperature inside the secondary combustion chamber 50 can spontaneously ignite. After confirming that the temperature has risen to be stable, the burner 51 stops the fuel and switches to a state in which only blowing is performed.

  As described above, it is possible to suppress the influence of exhaust heat on the environment by lowering the temperature of the exhaust while removing the smoke in the kiln by secondary combustion. Further, since the blowout from the burner 51 into the chimney 16 is performed obliquely upward and is assisted by the rising air flow generated by the blower 55, the secondary combustion gas generated in the chimney is In addition, there is no back flow toward the flue 15 side, and the environment of the firing chamber 62 is not affected.

  As mentioned above, although Example 1-3 was demonstrated by making invention into embodiment, this invention is not limited to these, The various change in the range which does not deviate from the summary is possible.

  For example, even if the water spray nozzle 59 is not provided in the third embodiment, an ascending kiln that can sufficiently achieve the object of the present invention that does not affect the firing environment while suppressing soot can be configured. Conversely, a hole kiln equipped with a water spray nozzle 59 in the fourth embodiment may be used.

  In addition, the burner 22 according to the first and second embodiments may not be used as a blower, and may be separately provided with a blower that is driven with the burner 22 retracted and blows air into the back surface of the partition wall 26.

  Similarly, a blower may be separately provided in parallel with the burner 51 of the third and fourth embodiments.

  In addition, in the first and second embodiments, the burner 22 may not have a function of entering and retracting from the secondary combustion chamber 20.

  The present invention can be used as a technique for removing soot without affecting the work by applying it to a climbing kiln or an anagama kiln using soot as fuel.

DESCRIPTION OF SYMBOLS 1 ... Climbing kiln of Example 1 2 ... Climbing kiln of Example 2 3 ... Climbing kiln of Example 3 4 ... Hole kiln of Example 4 11 ... Burner 12-14 ..Baking chamber 14a ... temperature sensor 15, 15a, 15b ... flue 16 ... chimney 16a ... flue opening 17 ... damper 20 ... secondary combustion chamber 21 ... intermediate Wall 22 ... Burner 23 ... Rooster 24 ... Temperature sensor 25 ... Secondary combustion chamber inlet 26 ... Partition wall 30 ... Blower 31 ... Blower inlet 32, 33 ... Temperature sensor 40 ... Water spray chamber 41 ... Intermediate wall 42 ... Water spray nozzle 50 ... Secondary combustion chamber 51 ... Burner 52 ... Burner outlet 53 ...・ Rostor 55 ... Blower 56 ... Blower outlet 57,58 · Temperature sensor 59 ... water spray nozzle 61 ... fired ports 62 ... baking chamber 62a ... Temperature sensor

Claims (6)

It comprises a firing chamber configured so that the floor surface from the soot to the flue rises gradually, and is configured to exhaust smoke from the chimney installed through the flue from the end of the firing chamber, A wood-fired kiln having a temperature sensor for detecting the temperature in the firing chamber and having the following configuration.
(1) A damper that opens and closes the flue and that can set the opening degree at an intermediate opening degree is provided.
(2) A burner that blows fuel and air in a direction crossing the flue is installed at a position downstream of the damper, and a cross-sectional area larger than that of the flue is installed in a portion where the burner is installed A secondary combustion chamber must be formed.
(3) A partition wall is provided between the blowing position by the burner and the damper, and the exhaust gas from the firing chamber flows around the partition wall and flows into the secondary combustion chamber.
(4) At the lower part of the chimney, a blower that blows air obliquely upward and capable of adjusting the air volume is installed.
(5) The secondary combustion chamber is taller than the flue, an intermediate wall is erected at the rear position of the burner, and the airflow in the secondary combustion chamber rises from the blowing position by the burner , It is structured to descend over the intermediate wall and to be discharged to the rear flue.
(6) The burner should be usable as a blower that stops fuel and blows only air.
(7) A temperature sensor that is installed at a position behind the intermediate wall of the secondary combustion chamber and detects the temperature in the secondary combustion chamber is provided. 2. The pottery kiln for ceramic art according to claim 1, wherein the configuration of (6) is changed to the following configuration.
(6 ′) A separate blower for blowing air to a fuel blowing position by the burner between the partition wall and the intermediate wall when the burner is stopped is provided. The pottery kiln for ceramic art according to claim 1 or 2, further comprising the following configuration.
(8) A water spray chamber is formed between the secondary combustion chamber and the chimney, and a water spray nozzle is installed on the ceiling of the water spray chamber.
(9) A temperature sensor for detecting the temperature in the chimney above the blower inlet of the blower is provided. It comprises a firing chamber configured so that the floor surface from the soot to the flue rises gradually, and is configured to exhaust smoke from the chimney installed through the flue from the end of the firing chamber, A wood-fired kiln having a temperature sensor for detecting the temperature in the firing chamber and having the following configuration.
(11) A damper that opens and closes the flue and that can set an opening degree at an intermediate opening degree is provided.
(12) A burner is provided in the chimney to blow the fuel together with the air obliquely upward.
(13) The outlet from the burner is opened above the flue opening in the chimney.
(14) In the chimney, a horizontal partition member with a slit is installed at a position away from the outlet by a predetermined distance in consideration of the fuel injection distance from the burner.
(15) The chimney is provided with a blower that blows air obliquely upward from a position above the horizontal partition member and capable of adjusting the air volume.
(16) The burner should be usable as a blower that stops fuel and blows only air.
(17) A temperature sensor for detecting the temperature in the chimney near the installation position of the horizontal partition member is provided.
(11) A damper for opening and closing the flue is provided.
(12) A burner is provided in the chimney to blow the fuel together with the air obliquely upward.
(13) The outlet from the burner is opened above the flue opening in the chimney.
(14) In the chimney, a horizontal partition member with a slit is installed at a position away from the outlet by a predetermined distance in consideration of the fuel injection distance from the burner.
(15) A fan that blows air obliquely upward from a position above the horizontal partition member is installed in the chimney.
(16) The burner should be usable as a blower that stops fuel and blows only air.
(17) A temperature sensor for detecting the temperature in the chimney near the installation position of the horizontal partition member is provided. 5. The pottery kiln for ceramic art according to claim 4, wherein the configuration of (16) is changed to the following configuration.
(16 ′) A blower for blowing air from the outlet of the burner when the burner is stopped is separately provided. 6. The pottery kiln for ceramic art according to claim 4, further comprising the following configuration.
(18) A water spray nozzle for spraying water in the horizontal direction in the chimney is installed between the horizontal partition member and the blower inlet of the blower.
(19) A temperature sensor for detecting the temperature in the chimney above the blower inlet of the blower is provided.