JP2018076997A - Horizontal rotary raw material heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a horizontal rotary raw material heating device that effectively and completely or partially burns a raw material including low-quality combustibles of high water content.SOLUTION: A horizontal rotary raw material heating device is provided with raw material supply means 6 for sending a combustible water-containing raw material to be heat-treated into a cylinder body 2 which is a horizontal type and rotates at one end part of the cylinder body 2, and also provided with a discharge opening part 11 for discharging a processed solid body formed by heat-treating the water-containing raw material to outside the cylinder body 2 and a discharge pipe 18 for discharging an exhaust gas at the other end part of the cylinder body 2, and further has, from the other end part, a combustion air sending-in pipe 22 and a circulating exhaust gas sending-in pipe 23 for sending at least part of an exhaust gas, generated in the cylinder body 2 by heating the water-containing raw material and discharged to outside the cylinder body, to the cylinder body 2, the combustion air sending-in pipe 22 and circulation exhaust gas sending-in pipe 23 being provided in one body such that at least outlets 22A, 23A of those pipes mix the combustion air and circulation exhaust gas together to form a confluence gas to flow to the water-containing raw material in the cylinder body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a horizontal rotating raw material heating apparatus, and in particular, recovers the retained energy of the combustible material by combusting the combustible material contained in the water-containing raw material by complete combustion or partial combustion using a low-grade combustible material having a high water content. The present invention relates to a horizontal rotating raw material heating apparatus for collecting gas.

  A lot of low-grade flammables with high moisture content are generated as waste in various industries and general public life. Combustion of these low-grade flammables as raw materials, and the low-grade flammables possess In the case of recovering energy from the minutes, the known method must dry this waste prior to combustion. This low-grade combustible material can be burned with the combustible material itself as fuel, so-called self-combustion.For example, when sewage sludge with a high water content is used as a raw material, almost all of the calorific value at the time of combustion is It is consumed to evaporate the water and dry it, and almost no energy can be recovered from the raw material.

  In general, when the object to be heated is a low-moisture content and small-sized inflammable material, a vertical or horizontal moving bed grate combustor is used as a means for complete combustion and partial combustion of this combustible material. In addition, when the object to be heated is a powdery combustible material, a fluidized bed, and when it is finely powdered, a combustion device such as an injection burner is commonly used.

  Even if these combustion devices are used to completely or partially burn the water-containing raw material, which is a low-grade combustible material having the above high water content, the water-containing raw material as the object to be heated has a high water content. As described above, since almost all of the calorific value is consumed for the evaporation of moisture, it is difficult to continue stable combustion, and the steady operation of the apparatus is almost impossible.

  Therefore, a horizontal rotary furnace type combustion apparatus has been proposed in order to heat-treat a low-grade combustible water-containing raw material. As this horizontal rotary furnace, there is an apparatus disclosed in Patent Document 1 for heat treatment of a water-containing raw material.

  In the apparatus of Patent Document 1, a horizontal rotating cylindrical body is subjected to heat treatment in which combustion or carbonization is performed by self-combustion while circulating a water-containing raw material, which is a low-grade combustible substance, in the cylindrical body. A raw material supply means is provided at one end in the axial direction of the cylindrical body, and a discharge opening for discharging the solid content after the heat treatment of the raw material and an exhaust pipe forming an outlet of the exhaust gas are provided at the other end. . In addition, in order to circulate the raw material in the cylindrical body, a partition wall extending in the axial direction and the radial direction in a region on one end side in the axial direction and an inclined guide plate standing on the surface of the partition wall are provided. doing.

  In Patent Document 1, a combustion air inlet pipe and a solid reaction gas inlet pipe for feeding a reaction gas such as water vapor, air, oxygen, etc., to the cylindrical body from the discharge opening on the other end side. It is provided to enter. The air inlet pipe for combustion enters the space above the upper layer surface of the raw material in the cylindrical body, and the gas inlet pipe for solid reaction enters the raw material layer. .

  According to such an apparatus of Patent Document 1, even if the raw material is a low-grade combustible material having a high moisture content, in addition to the combustion air from the combustion air inlet pipe, the reaction from the stationary reaction gas inlet pipe By supplying air as a working gas, heat treatment for burning or carbonizing the water-containing raw material can be performed as long as the excess air ratio is increased under a sufficient amount of air.

JP2002-130629

  In Patent Document 1, in addition to the combustion air inlet tube, a solid reaction gas inlet tube is provided, and therefore, for example, when air is blown as a reaction gas from the solid reaction gas inlet tube. It is conceivable that a part of the air rises in the raw material layer, goes out of the layer, is mixed into the combustion air from the combustion air inlet pipe, and contributes to combustion. However, since air as a reaction gas is introduced from outside the system including the cylindrical body (furnace) and its piping, the amount of exhaust gas that is subject to dust removal by the dust collector outside the furnace. Increases, the system becomes larger, and the burden increases economically. If an attempt is made to handle heat treatment of low-grade combustible materials using only the combustion air inlet pipe without providing the solid reaction gas inlet pipe, the amount of air blown from the combustion air inlet pipe is further increased. It is necessary to increase the size of the above system.

  Further, when the air as the reaction gas rises out of the raw material layer, the air does not stay near the surface of the layer, and the combustion air feed pipe is inclined upward so that the combustion air is moved upward. Since the air is blown out, the air is not sufficiently mixed with the combustion air from the combustion air inlet pipe, and even if mixed, the air does not stay near the surface of the layer, and is high with a low-grade combustible material to be heat-treated. Contact is insufficient even under excess air.

  Furthermore, it is preferable that the air to be used for combustion has a high temperature. For this purpose, the combustion air from the combustion air inlet pipe is required to be preheated before blowing, and preheating is required. In this respect as well, the size of the system must be increased.

  In view of such circumstances, the present invention effectively eliminates waste containing high-moisture-low-grade combustibles under an optimum value without increasing the size of the apparatus and without increasing the excess air ratio. It is an object of the present invention to provide a horizontal rotating raw material heating device capable of recovering retained energy of combustible materials and recovering combustible gas by combustion or partial combustion.

  The horizontal rotating raw material heating apparatus according to the present invention includes a heat-resistant cylindrical body that rotates around a horizontal axis or an axis that is slightly inclined with respect to a horizontal plane, and one end of the cylindrical body should be heat-treated. A raw material supply means for feeding the combustible water-containing raw material into the cylindrical body is provided.

  In such a horizontal rotating raw material heating apparatus, in the present invention, the other end portion of the cylindrical body discharges exhaust gas and a discharge opening for discharging a treated solid formed by heating the water-containing raw material to the outside of the cylindrical body. An exhaust pipe is provided, and at least a part of the exhaust gas generated by heating the water-containing raw material in the cylindrical body and discharged from the cylindrical body from the other end to the cylindrical body A circulating exhaust gas inlet pipe for returning, and the combustion air inlet pipe and the circulating exhaust gas inlet pipe have at least the outlets of these pipes join the combustion air and the circulating exhaust gas so that the combustible in the cylindrical body It is characterized by being integrally provided so as to form a combined gas directed to the water-containing raw material containing the product.

  According to the present invention having such a configuration, the combustion air from the combustion air inlet pipe and the exhaust gas from the circulating exhaust gas inlet pipe are sprayed toward the water-containing raw material in the cylindrical body as a combined gas in which the exhaust gas is sufficiently mixed. It will be. The combined gas contains combustible gas and air in the exhaust gas. Furthermore, although the temperature of the exhaust gas is lowered while reaching the circulating exhaust gas inlet pipe, it is considerably higher than the atmospheric temperature, Under an optimal air excess rate, the combined gas makes it possible to heat treat a low-grade combustible with a high moisture content in the water-containing raw material in the cylindrical body.

  Furthermore, in the present invention, the circulating exhaust gas joined to the combustion air from the combustion air inlet pipe is obtained in the system system including the cylindrical body and the exhaust gas treatment device. In this way, air is not introduced from outside the system, and the amount of exhaust gas treated to detoxify the exhaust gas can be reduced accordingly, so that the system system can be reduced in size and cost can be reduced.

  In the present invention, in addition to the combustion air inlet pipe and the circulating exhaust gas inlet pipe, a fluid fuel inlet pipe is also provided at the other end of the cylindrical body. The fluid fuel inlet pipe and the circulating exhaust gas feed so that the fluid fuel blown out from the combustion air, the combustion air from the outlet of the combustion air inlet pipe, and the circulating exhaust gas from the outlet of the circulating exhaust gas inlet pipe are combined. It is preferable to be provided integrally with the inlet pipe.

  The fluid fuel feed pipe blows out fluid fuel, for example, gaseous fuel, liquid fuel, powdered solid fuel, or a mixed fuel thereof, as auxiliary fuel during operation of the apparatus or, if necessary, during operation. Is done.

  In the present invention, it is preferable that the combustion air inlet pipe and the circulating exhaust gas inlet pipe are installed so that the combined gas of the combustion air and the circulating exhaust gas blown out from these outlets has a downward tilt angle.

  By doing so, the combined gas effectively contacts the hydrated raw material of the cylindrical body.

  In the present invention, in the case of having a fluid fuel inlet pipe in addition to the combustion air inlet pipe and the circulating exhaust gas inlet pipe, the fluid fuel inlet pipe is combusted with the fluid fuel from the fluid fuel inlet pipe. It is preferable that they are installed integrally so as to have a downward tilt angle, similar to the combined gas of the combustion air from the industrial air inlet pipe and the circulating exhaust gas from the circulating exhaust gas inlet pipe.

  In the present invention, both of the combustion air inlet pipe and the circulating exhaust gas inlet pipe, and the three inlet pipes of the fluid fuel inlet pipe are configured as one body, and the downward direction of the combined gas from these outlets It is preferable that the tilt angle is variable. By doing so, it is possible to select and set an appropriate downward tilt angle according to the combustion state in the cylindrical body, the properties of the water-containing raw material, and the processing amount.

  As described above, in the horizontal rotating raw material heating apparatus, the present invention is provided with a discharge opening for discharging the treated solid formed by heating the water-containing raw material to the other end of the cylindrical body. From the other end, a combustion air inlet pipe and a circulating exhaust gas inlet for returning at least a part of the exhaust gas generated by heating the water-containing raw material in the cylindrical body and discharged to the cylindrical body to the cylindrical body The combustion air inlet pipe and the circulating exhaust gas inlet pipe are combined gas that is directed to the water-containing raw material in the cylindrical body by combining the combustion air and the circulating exhaust gas at the outlets of at least both of these pipes Therefore, the combustion air from the combustion air inlet pipe and the circulating exhaust gas from the circulation exhaust gas inlet pipe are sufficiently mixed to reduce the heat treatment target. Contact with combustible materials with optimal air excess The combustion air from the combustion air inlet pipe joins with the circulating gas and the combined gas is heated to increase the combustion effect. Further, the circulating exhaust gas is mainly a cylindrical body. Since this can be done within the system, the system can be downsized in this respect. In this way, the present invention effectively burns waste containing low-grade flammables with a high moisture content under an optimal excess air ratio with respect to the raw material without increasing the size of the apparatus. Partial combustion can recover the stored energy of combustible materials and also recover combustible gases.

It is a longitudinal cross-sectional view in the surface containing the axis line of the apparatus of 1st embodiment of this invention. It is the II-II sectional view taken on the line in FIG. 1 is a perspective view of the partition wall and guide plate portion shown in FIG. 2 of the apparatus. 1 is a longitudinal cross-sectional view in a diagram including an axis showing a modification of the apparatus. 1 is a cross-sectional view in a plane perpendicular to the axis showing another modification of the apparatus. It is sectional drawing in the surface containing the axis line of 2nd embodiment apparatus of this invention.

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

<First embodiment>
In FIG. 1, a cylindrical body 2 made of a heat insulating material is rotated by a bearing 3 at its ring-shaped flange portion 2A around an axis 1 inclined to the right at a small angle with respect to a horizontal or horizontal plane. It is supported freely and is rotationally driven by a driving means (not shown). In that case, the cross-sectional shape in the plane perpendicular to the axis 1 of the cylindrical body 2 is arbitrary, such as a circle, an ellipse, or a polygon, and is not limited. Further, the cross-sectional area of the cylindrical body 2 perpendicular to the axis 1 does not necessarily have to be constant in the axial direction, and may change at different positions on the axis. The position, type, and number of the bearings 3 are not necessarily limited to those shown in FIG.

  A supply opening 4 is formed at one end of the cylindrical body 2 and communicates with the tip of a raw material supply means 6 that communicates with a hopper 5 such as a raw material. A rotation seal 7 is provided between the supply opening 4 and the tip of the raw material supply means 6 to allow relative rotation in a sealed state. The rotary seal 7 is not limited to that shown in FIG. 1 is provided with means having a spiral member for transferring the hydrated raw material in the direction of the axis 1 into the cylindrical body 2, but this transfer means is limited to the spiral member shown in the figure. However, other types of means may be used, and the same partition walls and guide plates as will be described in detail below can be formed.

  In the cylindrical body 2, a plate-like partition wall 9 parallel to the plane including the axis 1 (in the illustrated case, parallel to the paper surface) is installed in an area close to the supply opening 4 (FIGS. 2 and 2). (See also 3). At the front and rear end edges in the direction of the axis 1 of the partition wall 9, two spaces partitioned by the partition wall 9 form a communication space. One or a plurality of guide plates 10, 10 ′ are provided on both surfaces of the partition wall 9. The guide plates 10 and 10 'have an inclination angle in the range of 60 to 85 degrees with respect to the axis 1, and the guide plates 10 and 10' provided on both surfaces of the partition wall 9 are inclined in the same direction in the figure ( (See FIG. 3). That is, for example, when one surface of the partition wall 9 is facing upward and when the other surface is facing upward, the guide plates 10 and 10 ′ on each surface may be inclined in the opposite direction. It can be understood from FIG. Therefore, the water-containing raw material that slides down along the guide plates 10 and 10 ′ with the rotation of the cylindrical body 2 moves in the opposite direction in the axial direction on both surfaces of the partition wall 9, and as a result, the front and rear edges of the partition wall 9. It circulates in the axial direction through the communication space. Thus, the partition wall 9 and the guide plates 10, 10 'form a raw material circulation means. In addition, the material of the said partition wall and a guide plate should just have heat resistance.

  In FIG. 1, a discharge opening 11 is formed at the other end of the cylindrical body 2 and is covered with a high temperature hood 12. Between the cylindrical body 2 and the high-temperature hood 12, a rotation seal 13 that allows relative rotation of the two is provided. The rotary seal 13 is not limited to that shown in FIG. 1, and any type or shape can be used as long as it has the purpose.

  The high-temperature hood 12 includes a discharge unit 17 that drops and discharges a lump-shaped or granular processed solid that has been heat-treated in the cylindrical body 2, and a high-temperature exhaust gas that is generated in the cylindrical body 2. And an exhaust pipe 18 for discharging to the outside.

  In the discharge opening 11 formed at the other end of the cylindrical body 2, a composite feed pipe 20 is disposed so as to protrude into the cylindrical body 2. In the present embodiment, the composite inlet pipe 20 is a triple pipe. The fluid fuel inlet pipe 21 is at the center, the combustion air inlet pipe 22 is at the outer periphery, and the circulating exhaust gas inlet pipe 23 is at the outermost periphery. have. The composite inlet pipe 20 includes an outlet 21A of the fluid fuel inlet pipe 21, an outlet 22A of the combustion air inlet pipe 22, and an outlet 23A of the circulating exhaust gas inlet pipe 23. The fluid fuel from the air outlet 21A, the combustion air from the air outlet 22A, and the circulating exhaust gas from the air outlet 23A are mixed at the time of blowing to form a combined gas. The fluid fuel inlet pipe 21 is used for ignition at the start of operation of the apparatus and further for increasing the amount of fuel as required. As the fluid fuel, liquid fuel, gaseous fuel, and pulverized solid fuel can be used. In the case of liquid fuel, the fuel is sprayed out.

  The fluid fuel to the fluid fuel feed pipe 21 and the combustion air to the combustion air feed pipe 22 are supplied from outside the system system including the cylindrical body 2 and the exhaust gas treatment device. As the circulating exhaust gas to the inlet pipe 23, a part of the exhaust gas after the exhaust gas discharged from the cylindrical body 2 is removed by the dust collector of the exhaust gas processing device is fed back to the circulating exhaust gas inlet pipe 23. It is covered by the above system system.

  In the example shown in the figure, the outlet 20A (the outlets 21A, 22A, 23A) of the composite inlet pipe 20 is at the height position of the axis 1 of the cylindrical body 2, and the combined gas from the outlet 20A faces downward. As shown, the position is set with an inclination angle θ with respect to the axis 1. Usually, since the water-containing raw material M in the cylindrical body 2 is stored at a height below the axis 1 of the cylindrical body 2 even at the maximum amount, the outlet 20A positioned at the height of the axis 1 is It is located above the layer surface of the water-containing raw material M, and the combined gas is blown against the layer surface with the inclination angle θ. The composite feed pipe 20 has a variable inclination angle θ formed by the axis 20X of the composite feed pipe 20 with respect to the axis 1 of the cylindrical body 2, that is, is variable with respect to the layer surface of the water-containing raw material M. Is preferred. The variable range of the tilt angle θ may be about 0 to 30 °. More preferably, it is desirable that the position of the air outlet 20A be variable even in the direction of the axis 1.

  In this embodiment, the combustion air from the outlet 22A of the combustion air inlet pipe 22 and the circulating exhaust gas from the outlet 23A of the circulating exhaust gas inlet pipe 23 form a combined gas, and the raw material supply means 6 The water-containing raw material M containing the water-containing combustible material is sprayed toward the surface of the layer of the low-grade combustible material having a high moisture content that is supplied and forms a layer in the cylindrical body 2. While stirring and circulating in the direction of the axis 1, it self-combusts or partially burns and carbonizes and generates combustible gas. From the outlet 21A of the fluid fuel inlet 21, fluid fuel is supplied together with the combined gas at the start of operation of the apparatus or when it is desired to add fuel during operation to promote combustion.

  The high-temperature circulating gas from the circulating exhaust gas inlet pipe 23 supplies combustible gas and air in the exhaust gas and also supplies thermal energy to enable combustion of low-grade combustibles.

  Thus, the waste that has been subjected to the heat treatment is discharged from the discharge portion 17 provided at the bottom of the high-temperature hood 12 as a solid matter, and from the exhaust pipe 18 as exhaust gas containing a combustible gas as a gas portion. The The exhaust gas is collected and detoxified by a detoxification processing device including a dust collector (not shown) and then released to the atmosphere. However, a part of the exhaust gas after dust collection is sent to the circulating exhaust gas as the above-mentioned circulating exhaust gas. It returns to the cylindrical body 2 from the inlet pipe 23 and is sent in.

<Second embodiment>
When the moisture content of the waste containing the low-grade combustible material as the raw material is particularly high, the space volume for drying in the cylindrical body 2 needs to be increased. For this purpose, for example, it is effective to form a window 19 on the partition wall 9 shown in FIG. 1 as shown in FIG. 4 as the second embodiment. By doing so, since the raw material passes through the window portion 19, the raw material circulates in both regions of the window portion 19 at the axis 1, and the volume of the space for drying the hydrous raw material increases, Mixing characteristics in the cylindrical body 2 are improved, and drying is promoted. In this embodiment, in order to promote drying of the water-containing raw material, it is also effective to more actively disperse the water-containing raw material in the gas. For this purpose, as shown in FIG. 5, a plurality of bowl-shaped lifters 2B are provided on the inner peripheral surface of the cylindrical body 2, and the dispersion can be strengthened by scraping and dropping the raw material.

<Third embodiment>
If the high-temperature solid matter discharged from the other end of the rotating cylindrical body 2 contains a combustible material such as activated carbon or charcoal, it will ignite and burn immediately if it is exposed to air. End up. Therefore, the third embodiment shown in FIG. 6 is characterized in that in such a case, a device that cools and safely discharges into the atmosphere while preventing ignition and combustion is installed at the bottom of the high-temperature hood 12. The solid component that rolls inside the rotating cylindrical body 2 flows out from the discharge opening 11 at the other end of the cylindrical body 2 and is sent to the cooler 24 that communicates with the bottom of the high-temperature hood 12. . A cooling pipe 25 is disposed inside the cooler 24, and gas or liquid is circulated from the cooling pipe inlet 26 to cool the solid component at a high temperature.

  In the apparatus of the third embodiment shown in FIG. 6, a sealing gas inlet pipe 27 is provided, and flows upward in the cooler 24 to seal the atmosphere in the high-temperature hood to the outside. In addition, a discharge mechanism 28 such as a rotary valve is provided in the lower part, and the solid component whose temperature has been lowered is discharged from here to the atmosphere. The cooler, the cooling pipe, and the discharge mechanism in FIG. 6 are not necessarily limited to the type shown in FIG.

DESCRIPTION OF SYMBOLS 1 Axis 2 Cylindrical body 6 Raw material supply means 21 Liquid fuel inlet pipe 21A Outlet 22 Combustion air inlet pipe 22A Outlet 23 Circulating exhaust gas inlet pipe 23A Outlet θ Inclination angle

Claims (6)

A heat-resistant cylindrical body that rotates about a horizontal axis or an axis that is slightly inclined with respect to a horizontal plane, and a flammable hydrous material to be heat-treated at one end of the cylindrical body is placed in the cylindrical body. In the horizontal rotating raw material heating apparatus provided with raw material supply means for sending in,
The other end of the cylindrical body is provided with a discharge opening for discharging the treated solid formed by heat treatment of the water-containing raw material to the outside of the cylindrical body and an exhaust pipe for discharging the exhaust gas. An air inlet pipe for use, and a circulating exhaust gas inlet pipe for returning at least a part of the exhaust gas generated by heating the water-containing raw material in the cylindrical body and discharged outside the cylindrical body to the cylindrical body,
The combustion air inlet pipe and the circulating exhaust gas inlet pipe are integrated so that at least the outlets of these pipes join the combustion air and the circulating exhaust gas to form a combined gas directed to the water-containing raw material in the cylindrical body. A horizontal rotating raw material heating apparatus characterized by being provided.   In addition to the combustion air inlet pipe and the circulating exhaust gas inlet pipe, a fluid fuel inlet pipe is also provided at the other end of the cylindrical body, and the fluid fuel inlet pipe is blown out from the outlet. Integrated with the fluid fuel inlet pipe and the circulating exhaust gas inlet pipe so that the fluid fuel, the combustion air from the outlet of the combustion air inlet pipe and the circulating exhaust gas from the outlet of the circulating exhaust gas inlet pipe are joined together The horizontal rotating raw material heating apparatus according to claim 1, wherein the horizontal rotating raw material heating apparatus is provided.   The combustion air inlet pipe and the circulating exhaust gas inlet pipe are installed so that the combined gas of the combustion air and the circulating exhaust gas blown out from their outlets has a downward inclination. Horizontal rotating raw material heating device.   The fluid fuel inlet pipe is arranged so that the combined gas of the fluid fuel from the fluid fuel inlet pipe, the combustion air from the combustion air inlet pipe and the circulating exhaust gas from the circulating exhaust gas inlet pipe has a downward inclination. The horizontal rotating raw material heating apparatus according to claim 2, wherein the horizontal rotating raw material heating apparatus is installed.   The horizontal rotating raw material heating device according to claim 3, wherein the combustion air inlet pipe and the circulating exhaust gas inlet pipe have variable downward inclination angles of the combined gas from their outlets.   The horizontal rotating raw material heating according to claim 4, wherein the combustion air inlet pipe, the circulating exhaust gas inlet pipe, and the fluid fuel inlet pipe have variable downward inclination angles of the combined gas from the outlets. apparatus.

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