JP2007225125A - Scattering asbestos melting treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scattering asbestos melting treatment device capable of simultaneously melting substances different in melting points, improving energy efficiency, and reducing construction cost so that a furnace is not blocked by preventing the fusion of a melted heated object to a heat medium, related to scattering asbestos treatment in an internal-combustion fluid bed furnace. <P>SOLUTION: The unfluidized heat medium is placed in a combustion atmosphere by a mixture gas of gas and air, and melting treatment is performed by allowing the heated object to pass through the heat medium heated to a high temperature. A furnace temperature is controlled at high accuracy so that the heat medium and a furnace wall are not melted and damaged by excess combustion and abnormal combustion. The heated object is finely granulated so that high heat energy can be efficiently applied to the heated object. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an internal combustion type heat medium combustion furnace that melts detoxified asbestos, melts other fine powders, detoxifies toxic gases and odors, and does not bromide.

  There is an internal combustion fluidized bed furnace as an apparatus for producing fine hollow glass spheres, which heats fine powders at a high temperature by radiant heat generated from a ceramic heat medium. The heating medium is fluidized, and the heated object passing through it is instantaneously heated to a high temperature.

  A solid heat medium heated to a high temperature gives a large amount of heat energy to the object to be heated, and the melting point of the object to be heated is lower than that in a gas atmosphere such as an electric furnace or a heating burner. can do.

  In addition, the following patent document 1 can be mentioned as a well-known technique relevant to this invention.

  JP 11-011960 A

  In the internal combustion fluidized bed furnace, since the heat medium is fluidized, when the heated object melted in the heat medium is fused, the flow of the heat medium stops, and the combustion of the furnace stops or the furnace closes. This phenomenon occurs when the furnace temperature setting or the furnace temperature itself exceeds the melting point of the object to be heated. Therefore, it is difficult to simultaneously melt the heated object composed of a wide variety of substances such as the scattering asbestos product in the internal combustion fluidized bed furnace. In addition, it is difficult to determine the optimum melting furnace temperature.

  A material having a melting point lower than that of asbestos, such as cement and rock wool, is used in the scattering asbestos product. In the furnace set at the asbestos melting temperature, cement, rock wall, etc. are melted before asbestos, adhere to the fluidized heat medium, stop the furnace combustion, and the furnace is closed.

  In order to introduce the scatterable asbestos product into the internal combustion heat medium combustion furnace, it is necessary to pulverize the scatterable asbestos product into fine particles as a pretreatment. Asbestos has high hardness, tooth wear is severe in a toothed type pulverizer, and products such as sprayed asbestos are cottony and have poor fluidity, so that pulverization does not proceed in a ball mill. Furthermore, it is necessary to control the input amount of the heated object suitable for the processing capacity of the furnace while maintaining hermeticity so as to prevent scattering outside the apparatus.

  When organic paints and solvents are mixed in the flyable asbestos product, they are heated with a heat medium to become flammable gas, and abnormal combustion causes the inside of the free board to become abnormally hot and damages the furnace.

  The present invention is a novel internal combustion type heat medium combustion furnace that solves the essential problem of fusing asbestos treatment in the internal combustion fluidized bed furnace.

  In an internal combustion fluidized bed furnace, fuel gas, air, and an object to be heated are introduced from the bottom of the furnace in order to cause the heat medium to flow. However, in the present invention, it is not necessary to cause the heat medium to flow. Gas, air and heated object can be charged. The heating medium is sandwiched between two plates and fixed, and the heated object, the molten material to be heated, and the solidified heated object due to the pressure difference between the air compressor and the exhaust gas blower, that is, the pressure difference between the upper and lower plates. The body is transported.

  Since the main component of the diffusible asbestos product is ceramic, it is easily fused to the ceramic heat medium and the furnace is closed. In order to avoid this, as the heat medium, a metal-based heat medium that has a high melting point and is difficult to be fused with the ceramic-based heated object is used. In the case of an object to be heated which is not fused, a ceramic heat medium can also be used.

  It is important to pulverize the asbestos product as finely as possible in order to pass the object to be heated through the eye plate of the internal combustion heat medium combustion furnace and to give the heat energy to the object to be heated more efficiently than the heat medium. . A rod-type vibration mill is used to pulverize asbestos products with very fine particles. Since the leakage of asbestos outside the equipment is dangerous, the mill and the combustion furnace are directly connected. A buffer tank for temporarily storing an object to be heated is coupled to the outlet of the rod type vibration mill.

  In order to control the input amount of the pulverized heated object, a screw type feeder having a motor whose rotation is controlled is mounted at the outlet of the buffer tank. When a level sensor is installed in the buffer tank and the pulverized heated object accumulated in the buffer tank exceeds the specified amount, an operation stop signal is sent from the sensor to the mill and the mill automatically operates. Stop.

  Abnormal combustion due to combustible gasification of the organic mixture detects the temperature of the lower part of the heat medium and the temperature in the free board, and controls the amount of fuel gas to perform stable combustion of the furnace.

  By sandwiching and fixing the heat medium in the eye plate without flowing, the heated object can be put in from the top. Mixtures other than the asbestos of the low melting point asbestos product do not hinder the melting of the high melting point asbestos. . That is, this method enables simultaneous melting treatment of substances having different melting points.

  By using a metal heating medium, it becomes difficult to fuse molten asbestos and other scattered ceramic mixture to the heating medium, enabling long-term operation without clogging the furnace. Become. A spherical ceramic heat medium having a high melting point is inferior to the metal one in terms of fusion, but can be used to some extent.

  Hard asbestos contained by using a rod type vibration mill can be pulverized into extremely fine particles, and because it is light and fluffy, scatterable asbestos products that could not be pulverized without fluidity in ordinary mills are also The mill rod can be transported to the outlet while pulverizing the asbestos product. Moreover, a stable furnace combustion state can be maintained by preventing an excessive amount of the object to be heated and introducing an appropriate amount.

  The gas obtained by combustible gasification of the organic mixture is further reused as fuel gas in the heat medium, increasing the energy efficiency of the furnace.

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

  FIG. 1 is composed of a cross-sectional view of an internal combustion type heating medium heating furnace body 8 and its peripheral devices, and represents the entire scattering asbestos melting apparatus, and FIG. 2 is a pulverizing apparatus 2 for a scattering asbestos product as a pretreatment apparatus. Represents the configuration.

  The air compressor 1 transports the combustion air, the fuel gas from the fuel gas tank 3, and the heated object pulverized by the pulverizer 2 to the combustion furnace 8. The heated object charged from the heated object charging port 30 is finely pulverized by the rod type vibration mill 31 and once accumulated in the buffer tank 34. A level sensor 33 is attached to the buffer tank 34. When the accumulated pulverized heated body exceeds a preset amount, a signal for stopping the operation is sent from the level sensor 33 to the mill operation device 32. The vibration mill stops operation. On the other hand, when the accumulation amount in the buffer tank decreases, an operation start signal is sent from the level sensor to the mill operation device, and the mill starts operation.

  The object to be crushed from the buffer tank 34 is sent to the combustion furnace 8 by a screw feeder 36. The screw feeder 36 is rotated by a motor 35 controlled by a rotation speed control device 37 and sends an appropriate amount of pulverized heated body to the combustion furnace 8. The entire mill system 2 is directly connected to the combustion furnace 8 with a pipe so that the pulverized heated body does not leak outside the apparatus.

  The pulverized heated body, air, and fuel gas are supplied to the heat medium 6 through the explosion-proof ceramic 4 and the upper pan 5 installed for preventing backfire. The temperature in the furnace is set to a minimum necessary temperature for melting the heated object, and the combustion furnace is optimally burned by the action of the control device 13.

  When an organic paint or solvent is mixed with the object to be heated, these may be heated by a heat medium to become flammable gas and the freeboard temperature may become abnormally high. In this case, an abnormal temperature is detected by a thermocouple, and the fuel gas is adjusted to control the abnormal temperature in the furnace.

  The heated object that has passed through the lower pan 7 is cooled by the cooling device 9 and recovered by the recovery box 10 or the bag filter 11. The exhaust gas blower 12 makes the downstream of the upper pan 5 negative and transports the entire heated body together with the air compressor 1.

  The shape of the metal heat medium is not limited to a spherical shape, and may be an assembly of metal meshes having a multilayer structure.

  The present invention can be used for spheroidizing silica and removing silanol groups in addition to the fusible asbestos melting treatment.

  It can be used to detoxify dioxins emitted from garbage incinerators and cremation incinerators.

  Odorless odors emitted from incinerators, livestock wastes, and food-related equipment at cremation centers can be eliminated.

  Since the present invention is not limited to the scale of the apparatus, it can be easily used by municipalities and small and medium enterprises.

  The scattering asbestos melting processing apparatus comprised with the internal combustion type heat-medium combustion furnace main body and its peripheral equipment is represented. The furnace body is a cross-sectional view.   The structure of the grinding | pulverization apparatus 2 shown in FIG. 1 is represented.

Explanation of symbols

1 Air compressor 2 Rod type vibration mill with attached amount control device Detailed drawing 2
3 Fuel Gas Tank 4 Explosion Proof Ceramic Ball 5 Upper Pan 6 Metal Heating Medium 7 Lower Pan 8 Internal Combustion Heat Medium Combustion Furnace 9 Cooling Device 10 Collection Box 11 Bag Filter
12 Exhaust blower
13 In-furnace temperature controller 14 Air flow detector 15 Air flow automatic adjustment valve 16 Fuel flow automatic adjustment valve 17 Fuel flow detector 18 Thermocouple 19 Thermocouple 20 Ignition burner
30 Heater input port 31 Rod-type vibration mill 32 Mill operation device 33 Level sensor
34 Crushing heated object buffer tank 35 Motor
36 Screw feeder
37 Motor speed control device

Claims (4)

  An internal combustion type that burns a mixed gas of fuel gas and air in a furnace, places a heat medium that does not flow in the combustion atmosphere, heats it at a high temperature, heats and melts the powder with that heat medium, and heats the gas Heat medium combustion furnace. The heat medium of the internal combustion heat medium combustion furnace is made of a metal or ceramic material.   The internal combustion heat medium combustion furnace is connected to a rod-type vibration mill, which is connected to a buffer tank equipped with a level sensor, and is further rotated by a motor capable of controlling the variable rotational speed. They are connected by a feeder.   The internal combustion heat medium combustion furnace detects abnormal combustion caused by a combustible gas generated from an object to be heated and performs stable combustion by combustion control.

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