JP2013015301A - Heat treatment device of moisture containing product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat treatment device of a moisture containing product, which applies high temperature treatment to an object to be treated by using overheat steam, and effectively utilizes heat generated by a boiler for generating the overheat steam.SOLUTION: The heat treatment device has: first and second rotary kilns 12, 13 having hot-wind generation furnaces 11 in intermediate positions; the overheat steam generation boiler 40 for supplying overheat steam to the second rotary kiln 13; and a steam introduction pipe 34 for introducing the overheat steam of the second rotary kiln 13 into the first rotary kiln 12. Steam supplied to the overheat steam generation boiler 40 is generated by exhaust gas from the overheat steam generation boiler 40, and the exhaust gas generated from the first rotary kiln 12 is collected and made to serve as part or the whole of the combustion air of burners 32, 43.

Description

The present invention relates to a heat treatment apparatus suitable for drying or carbonizing sludge, slurry, and a processed product having similar properties.

Patent Document 1 proposes a carbonization treatment method such as sludge using a rotary kiln capable of continuously carbonizing an object having a high moisture content such as sewage sludge and having an irregular shape and high viscosity. This rotary kiln rotates and drives a cylindrical body that is inclined from the entrance side to the exit side, and dries and carbonizes sewage sludge that is gradually conveyed by a gas burner provided on the exit side. The black smoke and odor generated in the rotary kiln are burned by the burner in the combustion block.

JP 2002-302679 A

However, since the rotary kiln described in Patent Document 1 uses a direct combustion burner, not only the object is carbonized, but part of the object may burn, and this is not necessary if the object is not combusted. The method is not applicable.
In addition to the gas burner for heating the inside of the rotary kiln, a burner for treating the combustion exhaust gas is also used, but the heat contained in the exhaust gas is not recovered.
Furthermore, since the rotary kiln has only one stage, there is a problem that it is difficult to perform operations such as changing the processing temperature according to the progress of processing, and thus it is difficult to effectively use energy.

The present invention has been made in view of such circumstances, and performs high-temperature treatment of a processing object using superheated steam, and heat treatment of a hydrous material that effectively uses heat generated in a boiler for generating superheated steam. An object is to provide an apparatus.

The heat treatment apparatus for hydrous materials according to the present invention that meets the above object is provided on the entry side of the first and second rotary kilns, which are respectively inclined downward and aligned with the axis. An exhaust gas recovery chamber, an input feeder that passes through the exhaust gas recovery chamber and carries a processing object made of water-containing material from the side entering the first rotary kiln, and an intermediate portion of the first and second rotary kilns are provided. The hot air generated from the first burner is turned into a swirl flow, and the hot air generating furnace fed into the second rotary kiln together with the processing object heated by the first rotary kiln, and the hot air generating furnace A collision member that is provided with a gap on the side and that receives the object to be processed conveyed by the hot-air generating furnace and drops it downward, and the second rotor A superheated steam generating nozzle that is disposed in a kiln and further heat-treats the object to be processed fed by the hot air generating furnace, a superheated steam generating boiler that includes the second burner and generates the superheated steam, and the first A feeder with a water jacket that is disposed on the outlet side of the second rotary kiln and collects the object to be processed that has been heat-treated in the second rotary kiln; and a second center of the second rotary kiln, A steam introduction pipe for leading superheated steam from the rotary kiln to the first rotary kiln, and combustion air for exhaust gas discharged from the exhaust gas recovery chamber to one or both of the first burner and the second burner And an exhaust pipe that leads as

Further, in the hydrated heat treatment apparatus according to the present invention, the hot air generating furnace is arranged in alignment with the second rotary kiln and directed from the first rotary kiln toward the second rotary kiln. It is preferable that a tapered guide cylinder having a reduced diameter is provided, and the hot air from the first burner flows between the guide cylinder and the steam introduction pipe as a spiral flow.

In the hydrated heat treatment apparatus of the present invention, it is preferable to have an exhaust heat boiler that uses exhaust gas from the superheated steam generation boiler as a heat source, and to supply the steam from the exhaust heat boiler to the superheated steam generation boiler.

In the hydrated heat treatment apparatus of the present invention, it is more preferable that a part of the superheated steam generated from the superheated steam generation boiler is supplied to the hot air generating furnace.

In the hydrated material heat treatment apparatus according to the present invention, the input feeder is provided with a hopper for storing the processing object, and the processing object is gradually cut out by the input feeder comprising a screw conveyor. It is preferable to put it in one rotary kiln.

The water-containing heat treatment apparatus according to the present invention has the following effects.
That is, the object to be processed that has been input to the first rotary kiln by the input feeder is heated to a certain extent by heating the first rotary kiln, and the hot air generating furnace disposed in the middle part of the first and second rotary kilns is used for high-speed processing. Heated. In this hot air generating furnace, since the high-speed hot air generated from the first burner is swirling, the processing object can be heated at a short distance, and the heated processing object is decelerated by the collision member, It is carried into the second rotary kiln.

Since superheated steam is supplied into the second rotary kiln via a superheated steam generating nozzle, the object to be treated is heated at a high temperature, and the object to be treated is carbonized depending on the temperature. In addition, it can also dry in the range which lowers the temperature of superheated steam and a process target object does not carbonize. The processing object heat-processed with the 2nd rotary kiln is discharged | emitted outside, being cooled by the feeder with a water jacket.

On the other hand, the superheated steam supplied to the second rotary kiln is produced by a superheated steam generating boiler equipped with a second burner. And the superheated steam which heated the process target object in the 2nd rotary kiln and fell in temperature a little is guided to the 1st rotary kiln via a steam introduction pipe, and is used as a heat source. The exhaust gas is collected through an exhaust gas recovery chamber provided on the entrance side of the first rotary kiln, and the combustion air of the first burner that generates high-speed hot air and / or the second burner that generates superheated steam. It can be used as a part (or all) of the odor, thereby enabling the heat treatment of odors and harmful substances.
In particular, by filling the rotary kiln with superheated steam, a low oxygen atmosphere can be achieved, and combustion of the object to be treated by a combustion burner or the like can be suppressed.

Further, in the water-containing material heat treatment apparatus according to the present invention, the taper is arranged in the hot air generating furnace so as to be aligned with the second rotary kiln and is reduced in diameter from the first rotary kiln toward the second rotary kiln. When the hot air from the first burner flows in a spiral flow between the guide tube and the steam introduction pipe, the processing object heated by the first rotary kiln is Since they are collected and heated at high speed by high-speed hot air, the heat treatment of the object to be processed can be performed more efficiently.

The water-containing heat treatment apparatus according to the present invention has an exhaust heat boiler that uses exhaust gas from a superheated steam generation boiler as a heat source, and when steam from the exhaust heat boiler is supplied to the superheated steam generation boiler, heat is effective. More use is planned. Of course, when the heat source of the exhaust heat boiler is insufficient, another third burner may be provided.

In the heat treatment apparatus for hydrous material according to the present invention, when a part of the superheated steam generated from the superheated steam generating boiler is supplied to the hot air generating furnace, not only the heat quantity of the first burner but also the heat quantity of the superheated steam. Therefore, it becomes possible to heat the object to be processed which is transferred from the first rotary kiln to the second rotary kiln more strongly.

In the hydrated material heat treatment apparatus according to the present invention, the input feeder is provided with a hopper for storing the processing object (hydrated material), and the processing object is gradually cut out by the charging feeder consisting of a screw conveyor. When thrown into the rotary kiln, an appropriate amount of the processing object can be cut out in consideration of the capacities of the first and second rotary kilns.

It is a schematic side view of the heat processing apparatus of the hydrated material which concerns on one embodiment of this invention. It is sectional drawing of the heat processing apparatus of the said hydrated material.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1 and FIG. 2, the hydrated heat treatment apparatus 10 according to one embodiment of the present invention has a hot air generator 11 in the middle, and the first and second arranged in series. Rotary kilns 12 and 13 are provided. The first and second rotary kilns 12 and 13 are covered with a heat insulating material (not shown) around the outside so as to reduce heat loss.

The first and second rotary kilns 12 and 13 are aligned downward, for example, in the range of 1 to 4 degrees, and have steel tires 15 to 18 on both sides, and the tires 15 to 18 are left and right. Are supported by rollers 19a and 20a, respectively. The first and second rotary kilns 12 and 13 are driven to rotate at a low speed of, for example, 0.5 to 5 rpm by motor-driven small gears 21 and 22 meshing with the large gears 19 and 20 provided on the outer sides thereof. Yes.

An exhaust gas recovery chamber 25 having an inspection port 24 is provided on the entrance side of the first rotary kiln 12, and a screw conveyor 26, which is an example of a charging feeder, is disposed through the exhaust gas recovery chamber 25. The upstream side of the screw conveyor 26 is supported by a support member 27, and a charging hopper 28 is provided in the upper part. A processing object (made of water-containing material) in the charging hopper 28 is gradually cut out, and the first It is fed into the rotary kiln 12.

The hot air generating furnace 11 has an outer case 30 made of a cylindrical body having an inner diameter larger than the outer diameters of the first and second rotary kilns 12, 13, an outlet end portion of the first rotary kiln 12, The entrance side end of the rotary kiln 13 is fitted into the entrance side and the exit side of the outer case 30 in a substantially sealed state. This hot air generating furnace 11 has a truncated cone-shaped (that is, tapered) guide tube 31 whose diameter is increased on the entrance side. The guide cylinder 31 is disposed with the first and second rotary kilns 12 and 13 aligned with the axis.

In the entrance side region of the guide tube 31, the first burner 32 is arranged with its fuel flame blowing direction obliquely downstream with respect to the guide tube 31 and along the inner wall of the guide tube 31. The processing object discharged from the first rotary kiln 12 falling to the entrance side of the 31 is spirally flown inside the guide tube 31 together with high-speed hot air (swirl flow) of, for example, 100 m / second or more from the first burner 32. And flowing toward the second rotary kiln 13.
Thereby, the time heated by the hot air from the first burner 32 is extended, and further, the speed of the air current on the surface of the object to be processed is increased by the hot air, thereby further improving the drying effect.

On the exit side of the guide cylinder 31, a plate-like collision member 33 is provided on the entrance side of the second rotary kiln 13 with a gap from the guide cylinder 31, and is provided on the downstream side of the guide cylinder 31. The processing object discharged from the outlet at a high speed is made to collide with the collision member 33 to reduce the speed thereof, and dropped to the entrance side of the second rotary kiln 13.
Note that a steam introduction pipe having an entrance at a sufficient distance from the exit end of the guide cylinder 31 and flowing superheated steam in the second rotary kiln 13 to the first rotary kiln 12 is provided at the shaft center of the guide cylinder 31. 34 is arranged, which will be described later. The collision member 33 and the steam introduction pipe 34 are supported by the second rotary kiln 13 by a support member (not shown).

The second rotary kiln 13 is provided with a superheated steam generation nozzle. This superheated steam generation nozzle is composed of a pipe 38 with a plurality of nozzle holes 37 with closed ends disposed at 1/2 to 3/4 of the radius below the center position of the second rotary kiln 13. Yes. The plurality of nozzle holes 37 face downward so that high-temperature superheated steam is blown toward the object to be processed in the lower part inside the second rotary kiln 13.

Superheated steam generated by the superheated steam generation boiler 40 is sent to the end of the pipe 38 constituting the superheated steam generation nozzle via a connecting pipe 41. The pipe 38 extends to the rear position of the collision member 33, and the plurality of nozzle holes 37 are, for example, (0.1 to 0.7) L positions from the entrance when the total length of the second rotary kiln 13 is L. Is heated at a high temperature.

In this embodiment, the superheated steam from the superheated steam generating boiler 40 is also supplied into the hot air generating furnace 11 through the superheated steam supply port 42, and the direction thereof is the same as that of the first burner 32. The amount of heat held by the flame or hot air from the first burner 32 is increased. The superheated steam generation boiler 40 is provided with a second burner 43 to further heat the steam generated by the exhaust heat boiler 44.

On the downstream side of the second rotary kiln 13, an end sealed chamber 47 having a hopper 46 for receiving an object to be processed is provided, and a water-cooled screw feeder 48, which is an example of a feeder with a water jacket, is provided below the hopper 46. ing. Thereby, the temperature of the processing object heat-processed (drying process or carbonization process) with the 2nd rotary kiln 13 is lowered | hung, and it discharge | emits and collect | recovers outside.

Then, the flow of the vapor | steam in the heat processing apparatus 10 of this hydrated material is demonstrated.
The water supplied to the exhaust heat boiler 44 is heated by exhaust heat from the superheated steam generation boiler 40 to form steam. In this embodiment, the second burner 43 of the superheated steam generating boiler 40 is a large burner, and the steam supplied from the exhaust heat boiler 44 is, for example, 250 to 900 ° C. (250 when the object to be treated is dried). To 400 [deg.] C. and 400 to 900 [deg.] C. when carbonizing the object to be treated), a large amount of high-temperature exhaust gas is generated, and water is steamed using the heat of the exhaust gas. The water supplied to the exhaust heat boiler 44 can also be supplied from the water-cooled screw feeder 48, which further improves the overall thermal efficiency.

The superheated steam generated from the superheated steam generation boiler 40 is supplied from the end of the pipe 38 and blown out from the nozzle hole 37 to heat the object to be processed. And after heating a process target object, it enters into the 1st rotary kiln 12 through the vapor | steam introduction pipe | tube 34 which connects the 1st, 2nd rotary kilns 12 and 13. As shown in FIG. Since the superheated steam that has entered the first rotary kiln 12 has a sufficient amount of heat, the object to be treated put in the first rotary kiln 12 can be heated and dried.

Thus, the exhaust gas containing a large amount of water vapor passes through the exhaust gas recovery chamber 25 and is sent to the combustion air inlet 51 of the superheated steam generation boiler 43 through the exhaust pipe 50 provided in the upper part. In addition, since the combustion efficiency of the 2nd burner 43 will fall if the waste gas which passes the exhaust pipe 50 contains a lot of moisture, a dehumidifier (or heat exchanger) can also be provided in the middle.
By using this exhaust gas as the primary combustion air for the second burner 43, it is possible to incinerate harmful substances and odors contained in the exhaust gas.
In this embodiment, the exhaust gas from the exhaust gas recovery chamber 25 is the combustion air for the second burner 43, but it can also be the combustion air for the first burner 32.

A part of the superheated steam generated from the superheated steam generating boiler 40 is supplied into the hot air generating furnace 11 from the superheated steam supply port 42 of the hot air generating furnace 11, and together with the hot air generated by the first burner 32, the guide tube. The second rotary kiln 13 is supplied between 31 and the steam introduction pipe 34. As a result, the object to be processed in the guide cylinder 31 is accelerated and high-temperature heating is performed.

The present invention is not limited to the above-described embodiment, and the configuration thereof can be changed without changing the gist of the present invention. For example, you may provide a blade | wing inside the 1st, 2nd rotary kiln.
Moreover, in the said embodiment, although demonstrated using the specific number, a numerical value can also be changed in the range which does not change the summary of this invention.

DESCRIPTION OF SYMBOLS 10: Heat processing apparatus of a hydrous material, 11: Hot-air generator, 12: 1st rotary kiln, 13: 2nd rotary kiln, 15-18: Tire, 19, 20: Large gear, 19a, 20a: Roller, 21, 22: Small gear, 24: Inspection port, 25: Exhaust gas recovery chamber, 26: Screw conveyor, 27: Support member, 28: Loading hopper, 30: Outer case, 31: Guide cylinder, 32: First burner, 33: Collision member, 34: steam introduction pipe, 37: nozzle hole, 38: pipe, 40: superheated steam generation boiler, 41: connecting pipe, 42: superheated steam supply port, 43: second burner, 44: exhaust heat boiler, 46: Hopper, 47: End sealed chamber, 48: Water-cooled screw feeder, 50: Exhaust pipe, 51: Combustion air inlet

Claims (5)

The first and second rotary kilns that are respectively inclined downward and aligned with each other, the exhaust gas recovery chamber provided on the entry side of the first rotary kiln, the exhaust gas recovery chamber, and the first rotary kiln penetrating the exhaust gas recovery chamber. The rotary feeder is installed at the intermediate portion of the first and second rotary kilns, and a high-speed hot air generated from the first burner is used as a swirling flow. A hot air generating furnace to be sent to the second rotary kiln together with the processing object heat-treated by the first rotary kiln, and a gap on the outlet side of the hot air generating furnace are provided and conveyed by the hot air generating furnace. A collision member that receives the treated object and drops it down, and is disposed in the second rotary kiln and is sent by the hot air generating furnace. A superheated steam generating nozzle for further heat-treating the processed object, a superheated steam generating boiler provided with a second burner for generating the superheated steam, and an outlet side of the second rotary kiln; A feeder with a water jacket that collects the object to be processed that has been heat-treated by the rotary kiln 2 and an axial center position of the second rotary kiln, and superheated steam from the second rotary kiln is supplied to the first rotary kiln. And a steam introduction pipe for guiding the exhaust gas discharged from the exhaust gas recovery chamber to one or both of the first burner and the second burner as combustion air. Heat treatment equipment for hydrated materials. 2. The heat treatment apparatus for hydrous material according to claim 1, wherein the hot air generating furnace is arranged in alignment with the second rotary kiln and is directed from the first rotary kiln toward the second rotary kiln. A hydrous heat treatment apparatus characterized in that a tapered guide cylinder having a reduced diameter is provided, and the hot air from the first burner flows in a spiral flow between the guide cylinder and the steam introduction pipe. . 3. The hydrated heat treatment apparatus according to claim 1, further comprising an exhaust heat boiler that uses exhaust gas from the superheated steam generation boiler as a heat source, and supplies the steam from the exhaust heat boiler to the superheated steam generation boiler. A water-containing heat treatment apparatus characterized by the above. The water-containing material heat treatment apparatus according to any one of claims 1 to 3, wherein a part of superheated steam generated from the superheated steam generation boiler is supplied to the hot air generating furnace. Heat treatment equipment for hydrated materials. In the heat processing apparatus of the hydrous material of any one of Claims 1-4, the said feeder is provided with the hopper which stores the said process target object, The said process target object is provided with the said input feeder consisting of a screw conveyor. A water-containing heat treatment apparatus, characterized by being gradually cut out and put into the first rotary kiln.

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