JP2014013136A - Magnetic field thermal decomposition furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field thermal decomposition furnace that can perfectly combust a combustible object only with pilot light and without the need of fuel and electric power and generates only a minimum amount of ash, during normal operation.SOLUTION: A magnetic field thermal decomposition furnace includes: a hermetic type housing 1 having a vertical type cylindrical shape; an inner cylinder 2 installed inside the housing 1, with a predetermined interval with respect to the outer wall of the housing 1; a fire grate 3 provided at a position higher by a predetermined interval than the bottom part of the inner cylinder 2; a plurality of suction pipes 4 attached to the housing 1 so that the suction port of a base end part is positioned outside the housing 1 and the injection port of a tip part is positioned in a space between the upper part of the fire grate 3 and the lower part of the inner cylinder 2; a magnet box 5 provided in the vicinity of the suction port of each suction pipe 4 and having a permanent magnet applying a magnetic field to a suctioned air; an input port 6 and an input door 7 for inputting a combusted object from the outside of the housing 1; a recovery port 8 and recovery door 9 for recovering burned ash fallen from the fire grate 3; and a dry distillation gas processing tank 10 for passing exhaust gas discharged from a space between the outer wall of the inner cylinder 2 and the inner wall of the housing 1.

Description

  The present invention relates to a magnetic field pyrolysis furnace that burns a combustible with air that has passed through a strong magnetic field.

  It is known that there are ferromagnetic materials, paramagnetic materials, and diamagnetic materials as substances that act on a magnetic field. Ferromagnetic materials include simple substances such as iron, cobalt, and nickel, iron oxides, alloys, and the like, and they are attracted to a magnet or can themselves become a magnet. A paramagnetic material has a property of being attracted to a magnet when a magnetic field is generated by a strong permanent magnet or the like, and loses magnetism when the magnetic field disappears. Oxygen is a paramagnetic substance. A diamagnetic material has a property of repelling a magnet, and most gases including water and nitrogen are diamagnetic materials.

  When air is passed through a strong magnetic field with opposite poles (S pole, N pole) facing each other, oxygen molecules in the air exhibit paramagnetic properties and are pulled in the direction of the lines of magnetic force. Since the reverse magnetic material is pulled in the direction opposite to the magnetic field lines, it is considered that oxygen molecules and nitrogen molecules are separated, and clustered oxygen molecules are also subdivided.

  Many incinerators using the action of air that has passed a magnetic field generated by a powerful magnet have been proposed.

  Patent Document 1 discloses a heat-resistant container that forms an incineration processing chamber that is substantially cut off from an external space, and combustion air that is provided on the wall of the heat-resistant container and takes in combustion air into the incineration processing chamber by natural intake air. A magnetic field is generated on the intake, the inflow air restricting means for restricting the amount of air flowing into the incineration processing chamber by restricting the air intake, and the air passage for guiding the combustion air from the air intake to the incineration processing chamber. An incinerator having a magnet means for forming and magnetically processing the combustion air and a combustion gas outlet provided in a wall of the incineration chamber is disclosed.

  Patent Document 2 includes an incinerator, an intake passage communicating with the incinerator, an exhaust passage opened at an upper portion of the incinerator, and a magnet installed in the intake passage. The magnet is provided in the intake passage. The magnetic poles are arranged in the housing made of a non-magnetic material so as to face each other through the intake passage, and are held via the radial gap and the axial gap communicating with the intake passage with respect to the inner surface of the housing. A waste disposal apparatus is disclosed.

  In Patent Document 3, a combustion air introduction pipe is provided in a combustion chamber in which waste is accommodated, and a magnetized portion in which permanent magnets are arranged opposite to each other is provided in the introduction pipe, and combustion air passes through the magnetized portion. There is disclosed a waste incinerator that is gradually introduced into a combustion chamber and burns the waste in the combustion chamber in a low oxygen state.

  Patent Document 4 discloses a casing that forms a substantially cubic incineration chamber for incinerating waste, a first air introduction pipe that introduces external air from the wall of the casing into the incineration chamber, An air introduction member standing on the bottom surface, a second air introduction pipe for introducing external air into the incineration chamber from the wall surface of the air introduction member, the first air introduction pipe and the second air introduction pipe, and incineration A waste disposal apparatus including a magnet that exerts magnetism on external air introduced into a room is disclosed.

  In Patent Document 5, a magnetic induction device is provided in a furnace having a double outer wall, and a gas generated in the furnace is circulated in the furnace and the gas is subjected to secondary combustion in a combustion chamber furnace separately provided. Further, there is disclosed an incinerator in which dry distillation gas generated in the furnace is supplied to a workpiece supply path and the workpiece is pre-dried by a burner provided in the supply path.

  Patent Document 6 discloses a waste treatment apparatus including a casing that forms an incineration chamber for incinerating waste and an air introduction pipe that introduces combustion air into the incineration chamber from the outside of the wall of the casing. The air introduction pipe includes a magnet that exerts magnetism on the combustion air introduced into the incineration chamber, and the base of the air introduction pipe disposed outside the housing has negative ions that give negative ions to the combustion air. A waste treatment device coupled to a generator is disclosed.

  Patent Document 7 is a waste treatment apparatus including a housing that forms an incineration chamber for incinerating waste, and an air introduction pipe that introduces air into the incineration chamber from the outside of the wall of the housing, A waste treatment apparatus is disclosed that includes a magnet that exerts magnetism on the external air introduced into the incineration chamber and an ore that exerts negative ions on the external air.

  Patent Document 8 discloses an organic waste treatment furnace in which a plurality of intake members for taking in outside air through a magnetic field of a permanent magnet are provided on a side wall, and the organic waste is treated by flameless combustion in a state of oxygen shortage. Disclosed is an organic waste treatment furnace comprising a heat exchanger in which a plurality of substantially flat heat recovery materials in which a flow path for circulating water is formed are disposed in the furnace so as to surround the organic waste away from the side wall. Yes.

  Patent Document 9 discloses a component having a relatively high molecular weight, such as a function of removing odors caused by low molecular organic acids in cracked gas and tars in cracked gas for a pyrolysis furnace using air that has passed through a strong magnetic field space. Has disclosed a refuse disposal system using a pyrolysis furnace under a strong magnetic field having a function of removing odors generated by the odor.

  Patent Document 10 discloses a pyrolysis incineration having a structure in which an object to be incinerated (processed object) is combusted, and combustion gas generated by the combustion is pyrolyzed using a flame of a pyrolysis burner and then exhausted. In the furnace, it is provided with a cylindrical combustion chamber, a pyrolysis chamber disposed above the combustion chamber, and an exhaust cylinder connected to the pyrolysis chamber, and the combustion chamber contains an incinerated material (raw material). It is equipped with an incineration inlet that can be charged, and at least one air intake. The pyrolysis chamber has a cylindrical duct structure, and is connected to a pyrolysis burner at the starting point side of the cylindrical duct. The side is connected to the exhaust pipe, and further provided with a heat storage body that can be ventilated close to the position facing the burner port of the pyrolysis burner, and the combustion gas from the combustion chamber is placed in the gap between the burner port and the heat storage body. A pyrolysis incinerator having an intake of combustion gas that can be taken in is disclosed.

Japanese Patent No. 4008181 Japanese Patent No. 4108387 JP 2008-20093 A JP 2008-32287 A JP 2008-51476 A JP 2008-64324 A JP 2008-64325 A Utility Model Registration No. 3127645 JP 2008-246443 A JP 2008-267645 A

As disclosed in the above-mentioned Patent Documents 1 to 10, it has been recognized that air that has passed a strong magnetic field effectively acts as combustion air in the furnace, but for theoretical support, The research seems to be delayed.
As a result of various investigations, the present invention has revealed that a magnetic field pyrolysis furnace that can achieve complete combustion of combustibles and produces only a minimum amount of ash by using only a seed fire, no fuel or electric power during normal operation, and generating minimal ash. The purpose is to provide.

In order to solve the above problems, a magnetic field pyrolysis furnace according to the present invention includes a vertical cylindrical sealed casing,
An inner cylinder installed inside the housing at a predetermined interval with respect to the outer wall of the housing;
A grate provided at a predetermined interval higher than the bottom of the inner cylinder;
The inlet of the base end is located outside the casing, and the jet outlet at the tip is attached to the casing so as to be located in the space between the upper part of the grate and the lower part of the inner cylinder Multiple intake pipes,
A permanent magnet that is provided in the vicinity of the intake port of each of the intake pipes and applies a magnetic field to the sucked air;
An input port and an input door for introducing combustibles from outside the housing;
A recovery port and a recovery door for recovering the incinerated ash dropped from the grate,
A dry distillation gas treatment tank is provided, through which exhaust gas discharged from a space between the outer wall of the inner cylinder and the inner wall of the housing is passed.

  The intake pipe can be provided with a valve for adjusting the amount of intake air to adjust the combustion temperature and the combustion speed.

  The permanent magnet preferably has a magnetic flux density of 350 mT (Tesla) or more. If it is less than that, the magnetization of oxygen in the air becomes small, and the effect of the present invention becomes low. The upper limit of the magnetic flux density is not particularly defined, and if the magnetism of the permanent magnet is improved, it is considered that the effect of the present invention is improved correspondingly.

  It is preferable that the casing and the peripheral wall of the inner cylinder have an arc surface or a combination of a flat surface and an arc surface. In a rectangular parallelepiped housing, air stays in the corner portion and combustion becomes incomplete, so that the arc surface has no corner portion.

  It is preferable that a furnace ash layer mainly composed of silicon dioxide, calcium oxide, and ferric oxide is laid on the upper part of the grate, and burned objects are stacked on the layer. When the layer of the furnace ash is heated, it plays the role of a seed fire, and the combustion of the combustibles continues.

  By providing an air curtain device between the charging port and the charging door, when the charging door for opening the charging object into the charging port is opened, the charging port is formed by the air curtain formed by the air curtain device. It is interrupted | blocked and it can prevent that smoke comes out from the inside of a housing | casing.

  The air curtain device is provided with a shutter plate that can be opened and closed on the inlet side, so that the inlet can be closed during normal combustion to protect the air curtain device.

  The air blown into the air curtain device can be made compact by using the exhaust from the dry distillation gas treatment tank, so that it is not necessary to separately take in air from the outside.

  By placing a roller conveyor for charging the combusted material in front of the charging door, the combusted material can be input safely and efficiently.

  According to the present invention, during normal operation, combustion of a combustible material starts with ignition of only a seed fire, and fuel and electric power are not required, complete combustion of combustible material can be achieved, and minimal ash is generated. A magnetic pyrolysis furnace is provided. Further, by providing the air curtain device, it is possible to prevent smoke from being emitted from the inside of the housing when the charging door for putting the combustible into the charging port is opened.

It is a center part vertical front view of the magnetic field pyrolysis furnace which concerns on Embodiment 1 of this invention. It is a center part vertical side view of the magnetic field pyrolysis furnace which concerns on Embodiment 1 of this invention. It is a detailed top view of the magnetic field pyrolysis furnace which concerns on Embodiment 1 of this invention. The magnet box of the magnetic field pyrolysis furnace which concerns on Embodiment 1 of this invention is shown, (a) is a front view, (b) is a side view, (c) is a top view. It is a side view of the grate part of the magnetic field pyrolysis furnace which concerns on Embodiment 1 of this invention. It is a rear view of the grate part of the magnetic field pyrolysis furnace which concerns on Embodiment 1 of this invention. It is a front view of the magnetic field pyrolysis furnace with an air curtain apparatus which concerns on Embodiment 2 of this invention. It is a side view of the magnetic field pyrolysis furnace with an air curtain apparatus which concerns on Embodiment 2 of this invention. It is a principal part front view of the magnetic field pyrolysis furnace with an air curtain apparatus which concerns on Embodiment 2 of this invention. It is a principal part side view of the magnetic field pyrolysis furnace with an air curtain apparatus which concerns on Embodiment 2 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the magnetic field pyrolysis furnace according to the first embodiment of the present invention is a sealed casing in which a steel plate such as SPHC is formed into a vertical cylindrical shape and a rust preventive coating is applied. 1 and an inner cylinder 2 made of the same steel plate that is installed at a predetermined interval with respect to the outer wall of the casing 1 on the inner side of the casing 1 and provided at a position higher than the bottom of the inner cylinder 2 by a predetermined interval. The slat-like grate 3 and the inlet of the base end are located outside the housing 1, and the jet outlet of the tip is located in the space between the upper part of the grate 3 and the lower part of the inner cylinder 2. In addition, a plurality of intake pipes 4 attached to the housing 1 and a magnet provided near the intake port of each intake pipe 4 and provided with a pair of permanent magnets that give a magnetic field to the sucked air Box 5, inlet 6 and inlet 7 for injecting combustibles from outside the housing 1, and the incinerated ash dropped from the grate 3 A recovery port 8 and the recovery door 9 has a structure in which a dry distillation gas bath 10 through which exhaust gas discharged from the space between the inner cylinder 2 of the outer wall and the inner wall of the housing 1. The input door 7 has a double lid in order to reduce the loss of smoke when the waste is input.

  Furthermore, the magnetic field pyrolysis furnace of the first embodiment can be opened and closed to check the state of the combustibles on the grate 3 and to ignite a seed fire at the lower part of the front and back of the casing 1. Inspection ports 11 and 12 and an inspection port 13 for checking the combustion state of the combusted material are provided at the top of the housing 1.

  At the bottom of the casing 1, it is attached to the casing 1 so that the inlet at the base end is located outside the casing 1 and the outlet at the tip is located near the top of the grate 3. A plurality of auxiliary intake pipes 14, a blower 15 and a pipe 16 for forcibly sucking air from outside into each auxiliary intake pipe 14, and a distribution board 17 for supplying electric power to the blower 15 are provided. The forced air suction by the blower 15 can be used when it is desired to raise the combustion temperature or when there is a lot of moisture.

  An exhaust pipe 18 is provided at the upper part of the housing 1, and the upper part of the exhaust pipe 18 enters the dry distillation gas treatment tank 10. The dry distillation gas treatment tank 10 has a cooling water inlet 10a and a cooling water outlet 10b. The dry distillation gas treatment tank 10 serves to collect impurities and convert smoke into water vapor. The recovered liquid containing impurities can be reused as wood vinegar.

  The tip of the suction pipe 20 of the smoke eliminator / deodorizer 19 is inserted into the dry distillation gas treatment tank 10, and the air suction pipe 21 is inserted inside the suction pipe 20. The smoke eliminator / deodorizer 19 is also provided with an air discharge pipe 22 for sterilizing the air in the exhaust gas, deodorizing it below the reference value, and discharging it into the atmosphere. In the first embodiment, as the smoke eliminator / deodorizer 19, an apparatus that cools the exhaust with air is used.

  The height of the casing 1 is 2 to 3 m in the first embodiment, and a scaffold 23, a staircase 24, and a handrail 25 for charging or checking the combustible into the insertion slot 6 are outside the casing 1. Is provided. Moreover, the bottom board part of the housing 1 is raised in a boat shape so as not to attract moisture and to make it easy to take out the ash, and an in-furnace coolant recovery pipe 26 is provided at the bottom of the peripheral wall.

  As shown in FIG. 4, the magnet box 5 attached to the tip of each intake pipe 4 has an air intake port 51 and a connection part 52 to the intake pipe 4, and two permanent magnets 53 have an N pole and an S pole. Are fixed facing each other. Further, a projection 54 is attached to the air flow path inside the magnet box 5 so that the sucked air flow undulates. The magnetic flux density of the permanent magnet 53 is preferably a strong 1 to 1.5 T (tesla) material such as a neodymium magnet, but at least 350 mT or more. If it is smaller than this, the magnetization of oxygen in the air becomes small, and the effect becomes low.

  The intake pipe 4 is provided with a valve (not shown) for adjusting the amount of intake air, and by adjusting the amount of air (oxygen) supplied into the inner cylinder 2 through the intake pipe 4, the combustion temperature And the burning rate can be adjusted.

The structure of the grate 3 in Embodiment 1 is shown in FIGS.
The grate 3 is composed of a plurality of iron bars having an inverted triangular cross section, arranged on the cradle 33 at predetermined intervals, and a plurality of iron bars having an inverted triangular section, which are alternately arranged with the upper slats 31. The lower slats 32 are arranged on the cradle 34 so as to be positioned. The lower slats 32 are fixed to a shaft 36 that can move laterally with respect to the fixing bracket 35, and the handle 37 outside the housing 1 is reciprocated up and down to move the lower slats 32 horizontally by the crank mechanism 38. Can be dropped.

  In the magnetic field pyrolysis furnace according to the first embodiment, oxygen is consumed when the combusted material burns in the sealed casing 1, so that the inside of the sealed casing 1 becomes negative pressure, and the intake pipe The outside air is introduced through 4. At that time, outside air is attracted inside the magnet box 5, and the air flow enters the undulations by the protrusions 54. When the air passes through the magnetic field generated by the permanent magnet 53, oxygen in the air is paramagnetic. As a result, oxygen molecules vibrate at the permanent magnet 53, and are discharged into the intake pipe 4 so as to be undulated by the projection 54, and are sucked into the housing 1 as microclustered oxygen.

  In the inner cylinder 2 of the housing 1, the combusted material and oxygen in the minute clusters react vigorously, and the combusted material is combusted by the combustion heat and further decomposed.

  The ash that has been incinerated by combustion serves as a seed fire. Combustion material to be supplied to the housing 1 is a mixed waste that alternately supplies different types of combustible materials, such as one that is humid and dry, rather than continuously supplying one type of combustible material. Things are desirable.

  As shown in FIG. 1, the combustion of the combusted material in the inner cylinder 1 of the magnetic field pyrolysis furnace is performed by the upper processing waiting layer L1, the lower drying processing layer L2, the lower pyrolysis processing layer L3, The lower ashing layer L4 is layered in the vertical direction, and the decomposition reaction proceeds from the upper layer to the lower layer.

  The heat and smoke generated during the thermal decomposition are partially cooled while circulating through the inner wall of the double-tensioned casing 1 and the outer wall of the inner cylinder 2, and water droplets move along the inner wall of the casing 1 in the furnace. It exits from the cooling water recovery pipe 26. The remainder rises and enters the dry distillation gas treatment tank 10. For this reason, the outer wall of the housing | casing 1 does not become high temperature.

Medical waste is divided into general use and sterilization. For sterilization, air is sent by a blower 15 and the temperature is raised to an appropriate temperature. Moreover, even if the water content is high, it is easy to burn if air is sent by the blower 15.
Combustibles to be disposed of can be repeatedly added depending on the decomposition state in the decomposition furnace.

  Smoke is cooled in the dry distillation gas treatment tank 10, and air is taken into the pipe from the outside and sent to the smoke evacuation / deodorization device 19 to help collect impurities and discharge the water vapor while circulating. .

  The grate 3 is provided with an ash extraction device using an upper slat 31 and a lower slat 32, and the ash that has been sieved can be easily extracted from the recovery port 8.

  Table 1 shows the quantitative analysis of ash generated in the magnetic field pyrolysis furnace of the first embodiment and the analysis result of silicate. This is the result of examining the components of the ash that was produced when about 240 types of materials were decomposed, and was the result of examining the accumulated ash for about three years.

From Table 1, it can be seen that the ash produced in the magnetic field pyrolysis furnace of the first embodiment is not significantly different from the standard component distribution of municipal waste.

  In the magnetic field pyrolysis furnace of the first embodiment, when a new pyrolysis furnace is operated, the function as a seed fire does not occur until a certain amount of ash is produced. The effect of the present invention can be expected from the beginning by using the generated ash in a novel magnetic pyrolysis furnace.

  Table 2 shows the measured values of dioxin in the exhaust gas, and Table 3 shows the measured values of the exhaust gas.

Dioxins in the exhaust gas are most likely to be produced from plastic waste, and are most easily synthesized at 120 ° C to 200 ° C. Moreover, dioxins tend to disappear when the exhaust gas after combustion is quenched with water or air.

  From Tables 2 and 3, it can be seen that the emission regulation gas is far below the reference value and is safe.

  As described above, according to the first embodiment, not only the combustibles such as waste are combusted but also thermally decomposed, so that the amount of ash is small and the discharge of harmful substances is remarkably small. An energy-saving pyrolysis furnace that does not require electricity or electric power is provided.

  In the above-described first embodiment, the structure is provided with the input port 6 and the input door 7 for supplying the combusted material from the outside of the housing 1, but the input door 7 is opened to input the combustible material. And smoke comes out. Since the smoke emitted at this time is not smoke-deodorized or deodorized, it may be undesirable even if it is temporary. Some municipalities have strict regulations, especially in the case of medical combustibles.

  Therefore, Embodiment 2 of the present invention has a structure in which no smoke is emitted when a combustible is introduced into the housing 1.

  7 to 10 show a second embodiment of the present invention, in which an air curtain device 100 is provided between an inlet 101 for an object to be combusted in an enclosure 1 and an inlet door 102. A shutter plate 103 that is normally closed is provided between the air curtain device 100 and the inlet 101 and is opened and closed by a cylinder 104.

  An air blowing box 106 is provided in the upper part of the air box 105 forming the air curtain device 100, and an air suction box 107 is provided in the lower part. A partition plate 108 for rectifying the air flow is provided in the air blowing box 106.

  A dry distillation gas treatment tank 10 is provided in the upper part of the housing 1 in the same manner as in the first embodiment, and the air from which impurities are removed is extinguished by the air suction pipe 21, the suction pipe 20, and the air supply fan 27. -It is guided to the deodorizing device 19, detoxified and exhausted into the atmosphere. In the air curtain device 100 of the second embodiment, a part of the air passing through the suction pipe 20 is taken out by the blowing fan 109 and supplied to the air blowing box 106 through the pipe 110. A pipe 111 is connected to the air suction box 107 and sucked out by the suction fan 112 and guided to the smoke eliminator / deodorizer 19.

  In front of the charging door 102, a charging tower 113 provided with a roller conveyor 114 for charging the combusted material is installed, and a ladder 115 for an operator to place the combusted material on the roller conveyor 114 is also provided. .

An operation panel 116 for operating the cylinder 104 to open and close the shutter plate 108 is provided on the side of the housing 1.
Since other configurations are the same as those of the first embodiment, description thereof is omitted.

In the second embodiment having the above-described configuration, when the combusted material is introduced into the housing 1, the blower fan 109 and the suction fan 112 are operated to form an air curtain in the air box 105. Next, when the shutter plate 108 is opened and the closing door 102 is opened, the inside and outside of the housing 1 are opened, but an air curtain is formed in the air box 105. The smoke is blocked. In this state, the combustible is placed on the roller conveyor 114 and pushed into the charging port 101 of the housing 1, so that the combustible can be thrown into the housing 1 in a state where smoke discharge is blocked.
As a result, it is possible to cope with the treatment of medical-related waste whose exhaust emission standards are strict.

  In the present invention, during normal operation, combustion of a combustible material starts by ignition of only a seed fire, and no fuel or electric power is required, so that combustible material can be completely burned and only minimal ash is generated. As a magnetic pyrolysis furnace, it can be used in a wide range of fields such as shochu residue, hazardous materials, industrial waste, and debris treatment in disaster areas.

DESCRIPTION OF SYMBOLS 1 Housing | casing 2 Inner cylinder 3 Grate 31 Upper slats 32 Lower slats 33, 34 Abutment 35 Fixing bracket 36 Shaft 37 Handle 38 Crank mechanism 4 Intake pipe 5 Magnet box 51 Air inlet 52 Connection part 53 Permanent magnet 54 Projection 6 Port 7 Input door 8 Recovery port 9 Recovery door 10 Dry distillation gas treatment tank 10a Cooling water inlet 10b Cooling water outlet 11, 12, 13 Inspection port 14 Auxiliary intake pipe 15 Blower 16 Pipe 17 Switchboard 18 Exhaust cylinder 19 Smoke and deodorizer 20 Suction pipe 21 Air suction pipe 22 Air discharge pipe 23 Scaffold 24 Stairs 25 Handrail 26 In-furnace cooling water recovery pipe 27 Air supply fan 100 Air curtain device 101 Input port 102 Input door 103 Shutter plate 104 Cylinder 105 Air box 106 Air blowing box 107 Air suction box 08 the partition plate 109 blowoff fan 110, 111 pipe 112 suction fan 113 is turned on tower 114 roller conveyor 115 ladder 116 control panel

Claims (9)

A vertical cylindrical sealed housing;
An inner cylinder installed inside the housing at a predetermined interval with respect to the outer wall of the housing;
A grate provided at a predetermined interval higher than the bottom of the inner cylinder;
The inlet of the base end is located outside the casing, and the jet outlet at the tip is attached to the casing so as to be located in the space between the upper part of the grate and the lower part of the inner cylinder Multiple intake pipes,
A permanent magnet that is provided in the vicinity of the intake port of each of the intake pipes and applies a magnetic field to the sucked air;
An input port and an input door for introducing combustibles from outside the housing;
A recovery port and a recovery door for recovering the incinerated ash dropped from the grate,
A magnetic field pyrolysis furnace comprising a dry distillation gas treatment tank through which exhaust gas discharged from a space between the outer wall of the inner cylinder and the inner wall of the housing is passed.   The magnetic field pyrolysis furnace according to claim 1, wherein the intake pipe is provided with a valve for adjusting an intake air amount.   The magnetic field pyrolysis furnace according to claim 1, wherein the permanent magnet has a magnetic flux density of 350 mT or more.   The magnetic field pyrolysis furnace according to any one of claims 1 to 3, wherein the casing and the peripheral wall of the inner cylinder are an arc surface or a combination of a flat surface and an arc surface.   A furnace ash layer mainly composed of silicon dioxide, calcium oxide, and ferric oxide is laid on the upper part of the grate, and burned objects are burned on the layer. The magnetic field pyrolysis furnace according to any one of claims 1 to 4.   The magnetic pyrolysis furnace according to any one of claims 1 to 5, wherein an air curtain device is provided between the charging port and the charging door.   The magnetic field pyrolysis furnace according to claim 6, wherein the air curtain device is provided with an openable / closable shutter plate on the inlet side.   The magnetic pyrolysis furnace according to claim 6 or 7, wherein the air blown into the air curtain device uses exhaust from the dry distillation gas treatment tank according to claim 1.   The magnetic field pyrolysis furnace according to any one of claims 6 to 8, wherein a roller conveyor for charging a combustible is disposed in front of the charging door.