JPH0689948B2 - Burning energy transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION I. Object of the Invention (Field of Industrial Application) The present invention relates to a device for transmitting combustion energy. More specifically, the present invention relates to a combustion energy transmission device that converts combustion energy mainly into infrared energy and transmits it to an object to be heated.

(Prior Art) Converting combustion energy into radiant energy and using it as a heat source has been conventionally performed in a radiant gas burner, a radiant tube, or the like.
In particular, the radiant tube 101 is used as a heat source for a heat treatment furnace or a combustion furnace that uses a special atmosphere gas because the atmosphere gas inside the furnace is not contaminated. As shown in FIG. 3, this radiant tube burns oil or gas in the heat-resistant alloy tube to heat the tube, and heats the object to be heated by radiation heat from the outer surface of the tube. In the figure, 102 is a burner, 103 is an exhaust pipe, and 104 is a furnace wall.

(Problems to be Solved by the Invention) However, combustion in the radiant tube 101 usually requires a long flame. Since the radiant power is proportional to the fourth power of the absolute temperature, in the case of a radiant tube that requires a long flame with a relatively low flame temperature, it is lower than that of a radiant gas burner that burns in an open furnace. Becomes On the other hand, in the case of the radiant gas burner in which the mixed gas is rapidly burned in the tile opened in the furnace, high radiant heat can be obtained, but there is a drawback that the atmosphere in the furnace is contaminated with the combustion gas.

Therefore, it is an object of the present invention to provide a method of transmitting combustion energy that does not pollute the atmosphere in the furnace and can obtain high radiant heat.

II. Configuration of the Invention (Means for Solving the Problems) In order to achieve such an object, the combustion energy transmission device of the present invention is a wall surface that is divided into two chambers by a breathable solid and faces the breathable solid. At least one of which is made of a heat-resistant infrared transparent material, and burners are respectively installed in two chambers partitioned by a breathable solid, and the burner alternately discharges combustion gas and supplies combustion air through a heat storage body. A radiant energy conversion furnace and a radiant energy conversion furnace in which the burner is alternately burned, the burned gas is alternately burned, and the combustion gas is passed through a breathable solid to be exhausted from the chamber where the burner is not burned. And a light-collecting means that is arranged so as to face the breathable solid inside and is cut off from the inside of the radiant energy conversion furnace through an infrared transmitting material, and the light-collecting means collects light. The electromagnetic waves are to be composed of a waveguide for transmitting to the object to be heated.

(Embodiment) The configuration of the present invention will be described in detail below based on an embodiment shown in the drawings.

FIG. 1 is a principle diagram showing an example of an apparatus for carrying out the method of the present invention. In the figure, 1 is a radiant energy conversion furnace, 2 is a condenser lens, 3 is a waveguide, and 4 is a processing furnace.

The radiant energy conversion furnace 1 obtains electromagnetic energy, especially infrared rays and heat rays from combustion, and
The breathable solids 6 are filled so as to divide into the chambers 8 and 9, and the combustion gas generated in one of the chambers 8 or 9 can be discharged by passing through the breathable solids 6 and moving to the other chamber 9 or 8 side. Then, the breathable solid 6 is heated to convert the thermal energy of combustion into electromagnetic energy. The burner 5 installed in the radiant energy conversion furnace 1 does not have to have a special structure, and a burner of a type and model suitable for the radiant energy conversion furnace 1 can be appropriately selected from known or new burners. Good. For example, in the case of this embodiment, as shown in FIG. 2, a highly heat-resistant alumina ball or the like is provided in the middle of a combustion air injection passage (hereinafter abbreviated as an air passage) 52 opened around the fuel nozzle 51. The heat storage type burners filled with the heat storage body 53 are used as a pair. This burner 5
Is installed in each of the chambers 8 and 9 in the furnace 7 divided into two chambers by the air-permeable solid 6 and alternately burns the combustion exhaust gas from the air passage 52 of the burner of which combustion is stopped. It is configured to discharge. Therefore, when the combustion exhaust gas passes through the air-permeable solid 6 to heat the solid 6 and then is further discharged from the air flow path 52 of the burner which is stopped, the sensible heat is stored in the heat storage body 53 to burn the combustion air. It is used for preheating. The flow of combustion air and combustion exhaust gas in the burner 5 can be switched by any other direction switching means such as a known direction switching valve. For example, as in the present embodiment, the flow direction is such that the exhaust-side chamber 54 and the air-supply side chamber 55, which are in communication with the air flow path 52 filled or connected with the heat storage body 53, are alternately opened and closed by a slide valve body 56 in the form of a plug. Switching means may be used. The exhaust side chamber 54 is in communication with an exhaust means for combustion exhaust gas such as a blower, and the air supply side chamber 55 is in communication with a combustion air supply means such as a blower. Then, the slide valve body 56 is moved by the actuator 57 at regular intervals or as a heat storage body.
When the combustion temperature passing through 53 reaches a predetermined temperature, it is driven so that the flow can be switched in synchronization with fuel injection.

The burner 5 is not limited to the one described above, and any known type and structure of burner can be used. For example, a low-quality gas burner may be used to attempt to expand the range of utilization of low-quality energy. Burner 5
The number may be one or many, or the impermeable solid may be heated directly from the back surface.

Breathable solid 6 for partitioning the radiation energy conversion furnace 1
Is for positively converting sensible heat of flue gas into solid radiant energy in the furnace, and is a porous solid that allows flue gas to pass through for efficient energy conversion, such as heat-resistant wire mesh or sponge. It is made of materials such as ceramics and heat-resistant fibers. The air-permeable solid 6 is made of the above-mentioned material and has an appropriate structure or shape. For example, in the case of sponge-like ceramics, honeycomb-shaped cell holes are formed along the flow direction of combustion exhaust gas, and both ends thereof are in a checkered pattern. Are alternately sealed with a bottom so that the combustion exhaust gas passes through the continuous pores in the ceramic structure. Further, when a reflecting mirror (not shown) is installed on the back surface of the breathable solid 6, that is, on the opposite side of the condenser lens 2, it is preferable that the cell hole is not sealed with a bottom and is completely opened. . in this case,
A part of the electromagnetic waves / infrared rays reflected by the reflecting mirror passes through the breathable solid 6 and is directly incident on the condenser lens 2, but a part thereof is absorbed by the breathable solid 6 and heats it.
Since the electromagnetic energy is also radiated from the flame of the burner 5 and the combustion gas itself, it is possible to condense it with a parabolic reflector, etc. Since the difference is small, it is most preferable to heat the solid once with the combustion gas.

Also, when the temperature of combustion exhaust gas is around 1000 ° C, it is also possible to use a breathable solid structure with a wire mesh of iron-chromium-aluminum heat-resistant alloy FCH-2 woven with a wire diameter of about 1 mm and laminated to an appropriate thickness. It is possible.

The reflecting mirror is preferably provided by plating or vapor-depositing gold, silver, platinum, aluminum or the like so that infrared rays are strongly reflected.

The condenser lens 2 is the most common means for condensing the radiant energy generated in the furnace 1.
Other means such as a parabolic reflector can also be used. In order to protect the condenser lens 2 from the ambient temperature in the furnace, the condenser lens 2 is shielded from the chamber 8 in the furnace by, for example, a heat-resistant infrared transparent material 10, that is, the wall surface of the chamber 8 facing the condenser lens 2 of the furnace 1 is It is formed of a heat-resistant infrared transparent material, and cooling air or the like is made to flow along the surface thereof to perform heat shield cooling. In other words, the wall surface between the condenser lens 2 of the radiant energy conversion furnace 1 and the breathable solid 6 may be open, but a wall of the infrared transmitting material 10 is provided to protect the condenser lens 2. It is preferable.

As the infrared transmitting material described above, for example, As—S—Se or As—S—Te infrared transmitting glass is preferably used. In addition, the condenser lens 2 is formed by appropriately selecting an infrared optical material.

As the waveguide 3 for transmitting the collected electromagnetic energy to the predetermined processing furnace 4, an optical fiber, a reflecting mirror array, a gas lens, a lens array, or air propagation can be used, and transmission with low loss is possible. It is preferable to use an optical fiber or an array of reflecting mirrors, and it is more preferable to use an optical fiber having a passage region in the infrared region among the optical fibers whose waveguide can be bent and deformed freely. An optical fiber suitable for information transmission, whether it is a silica glass type or a multi-component glass type, meets the energy transmission requirement to some extent, although it has a certain transmission loss. Therefore, a bundle of optical fibers for information transmission may be used. However, recently, an optical fiber having improved infrared transparency has also appeared, and the infrared optical fiber is preferably used because it can also transmit infrared light with extremely low loss. For example, an infrared fiber (trade name Kristen-5) made of a thallium halide by extrusion method with a polycrystal fiber of about 1 mm has 90% of infrared rays of 10.6 μm.
The optical fiber of 1.06 μm, which has a cross-sectional area 9 to 16 times as large as that of the signal transmission fiber, allows the laser to be 2 to 3 d.
It can be transmitted with a low loss of B / km.

The processing furnace 4 of the terminal creates an atmosphere / condition / situation suitable / effective for utilizing the transmitted electromagnetic energy. For example, this energy transmission uses only radiation to radiate energy that does not require mediators. Therefore, it is possible to adopt a vacuum furnace or a furnace adjusted to an atmosphere of a specific component, and an ordinary heating furnace, firing furnace, heat treatment furnace or the like may be adopted. Also, the object to be heated W
Since the irradiation of electromagnetic energy to the chamber can be performed only in the furnace or in the house, it is possible to heat or process the electromagnetic energy directly from the optical fiber 3 in the field.

The electromagnetic energy emitted from the end face of the optical fiber 3 can be used as it is for heat treatment, or can be used for processing by converging it into a beam using an infrared optical system. In the case of thermal processing, the object W itself is irradiated with electromagnetic energy to be heated, and the object to be heated is irradiated, for example, to a black body object, and the temperature rise phenomenon of the object is transmitted or transmitted to the object to be heated. Depending on the case, heat may be transmitted. Further, it can be used not only for heating but also for heating the room.

The method for transmitting combustion energy according to the present invention using the combustion energy transmission system configured as described above is carried out as follows.

First, one burner 5 of the radiant energy conversion furnace 1 is burned, and the flue gas is burned in the air passage 52 of the other burner 5.
The flue gas is passed through the breathable solid 6 by being discharged from the furnace to the outside of the furnace. As a result, the thermal energy of the combustion exhaust gas is converted into radiant energy by heating the solid while passing through the permeable solid 6. That is, by heating the breathable solid 6 with the combustion gas, solid radiation is obtained from the breathable solid 6. In this case, the porous solid 6 has an extremely large heat transfer coefficient and heat transfer area as compared with a smooth surface, and in addition, the emission capability of solid radiation is orders of magnitude larger than that of gas, so that combustion The enthalpy of exhaust gas is effectively converted into radiant energy.

The radiation energy 11 emitted from the solid 6 is directly passed through the wall of the infrared transparent material 10 and is directed to the condenser lens 2.
Alternatively, the light is reflected by a reflecting mirror or the like arranged in the other chamber 9 so as to face the air-permeable solid 6 and then condensed by the condenser lens 2 and guided into the waveguide / optical fiber 3. Waveguide 3
The radiation energy trapped inside is transmitted to an arbitrary place while repeating total reflection or refraction in the waveguide 3. Then, the object to be heated is irradiated, absorbed, converted into heat energy, and used as a heat source for heating (including heating) or processing. Since this heating is heat transfer by means of radiation that does not require mediators, the furnace 4 can be evacuated or kept in a special atmosphere, combustion exhaust gas, dust, etc. are not generated, and the object W to be heated is extremely clean. Can be kept at Moreover, temperature control can be performed easily and promptly. Further, electromagnetic energy output from the end of the waveguide 3 is collected by using an infrared optical device, and the work W is narrowed down into a fine beam and then irradiated to perform various operations such as cutting, drilling, and welding. Do. At this time, since the transmitted electromagnetic wave also includes light in the visible region, the irradiation destination of the electromagnetic energy becomes clear and the working operation can be facilitated.

III. Effects of the Invention As is clear from the above description, the combustion energy transmission device of the present invention is divided into two chambers by a breathable solid, and at least one of the wall surfaces facing the breathable solid has a heat-resistant infrared transmission. A burner is installed in each of two chambers made of a material and partitioned by a breathable solid, and the burner is a heat storage type burner that alternately discharges combustion gas and supplies combustion air through a heat storage body. The radiant energy conversion furnace, in which the combustion gas is alternately combusted and the combustion gas is passed through the permeable solid to exhaust from the chamber where the burner is not combusted, and the permeable energy conversion furnace facing the permeable energy conversion furnace. A light condensing means that is arranged and is cut off from the inside of the radiant energy conversion furnace through the infrared transmitting material,
Since the electromagnetic wave collected by the light collecting means and the waveguide for transmitting the electromagnetic wave to the object to be heated are included, the atmosphere around the object to be heated is not polluted or heated in a vacuum atmosphere or various Enables processing. Moreover, unlike the case of using a radiant tube or the like, the present invention is completely separated from the combustion field and the electromagnetic energy radiating field, so that the flame and the radiant solid are not limited at all, and the high radiant energy from the high temperature flame is high. To be able to obtain. In particular, low-quality energy when burning coal gasification gas, etc. is converted into high-quality electromagnetic energy similar to electricity, facilitating the transfer of energy and making relatively high-quality products such as semiconductors in an unrestricted atmosphere. Heat treatment,
By utilizing it for heating and executing it with good thermal efficiency, the utilization of low-quality energy can be expanded.

[Brief description of drawings]

FIG. 1 is a principle view showing an example of an apparatus for carrying out the combustion energy transmission method of the present invention, FIG. 2 is a central longitudinal sectional view showing an example of a burner used in the apparatus, and FIG. 3 is a conventional radiant tube. FIG. 1 ... Radiation energy conversion furnace, 2 ... Condenser lens, 3
...... Waveguide, 4 ... Processing furnace, W ... Heated object.

Claims (7)

[Claims] 1. A breathable solid partition into two chambers, and at least one of the wall surfaces facing the breathable solid is formed of a heat-resistant infrared-transparent material, and each of the two chambers is partitioned by the breathable solid. A burner is installed, and the burner is a heat storage type burner that alternately discharges combustion gas and supplies combustion air through a heat storage body, alternately burns the burner and passes the combustion gas through the breathable solid. And a radiant energy conversion furnace configured to exhaust the burner from the non-combusting chamber, and the radiant energy conversion furnace is disposed so as to face the breathable solid in the radiant energy conversion furnace, and the radiant energy is transmitted through the infrared transparent material. It is characterized by comprising a condensing means which is cut off from the inside of the energy conversion furnace, and a waveguide which transmits the electromagnetic wave condensed by the condensing means to an object to be heated. Transmission device of the combustion energy. 2. The combustion according to claim 1, wherein the radiant energy obtained by transmitting the combustion gas through the breathable solid having a reflecting mirror on the back side is condensed and transmitted to the front side. Energy transmission device. 3. The combustion energy transmission device according to claim 1, wherein the breathable solid is a refractory having a large number of continuous pores having a relatively small average pore diameter. 4. The permeable solid has a honeycomb-shaped passage which communicates with the flow direction of the combustion gas and has both ends alternately sealed with a bottom in a checkered pattern. A device for transmitting combustion energy according to item 1. 5. The combustion energy transmission device according to claim 1, wherein the waveguide comprises an optical fiber. 6. The combustion energy transmission device according to claim 1, wherein the waveguide comprises an array of reflecting mirrors. 7. The apparatus for transmitting combustion energy according to claim 1, wherein the object to be heated is irradiated with transmitted electromagnetic energy in a vacuum atmosphere.