JP2004330080A - Steam-jet injection device for crush drying - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam-jet injection device for crush drying, in which a regenerative burner is unnecessary, position adjustment of a steam-jet nozzle is either unnecessary, leak of drain water is not caused, a high-temperature mixed gas can be injected as a sufficiently high crushing-pressure into a treatment tank, pressure variation is hardly caused, and a mixing rate in the volume of steam and a high-temperature gas can be easily changed. <P>SOLUTION: The steam-jet injection device includes a high-temperature gas-supply pipe 6 and an air-supply pipe 7. From the pipe 6, a high-temperature gas as a hot gas is supplied from a burner 8 into the treatment tank 1 simultaneously with a supersonic steam from a steam-jet nozzle 4. From the pipe 7, air coming from a blower 10 is supplied concurrently with the steam. A short injection pipe 3 is provided between the steam-jet nozzle 4 and a gas-injection port 2 of the tank 1. A double pipe-line is formed of the inside-placed high-temperature gas-supply pipe 6 and the outside-placed air-supply pipe 7 to have an opening at a midpoint in the injection pipe 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a steam jet injection device used for a steam jet pulverizer / dryer, more specifically, a high-temperature gas is injected into a processing tank together with supersonic steam injected from a steam injection nozzle, and the raw material is injected into the processing tank. The present invention relates to a steam jet injection device for crushing and drying.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as this type of steam jet injection device, there is one described in Patent Document 1 (Japanese Patent No. 2901951). As shown in FIG. 1, this steam jet injection device integrates a steam injection nozzle 50 and an ejector 51, sucks a high-temperature gas by the ejector 51 using the injection pressure from the steam injection nozzle 50, The gas is ejected from the ejection port 52 of the ejector 51 together with the supersonic steam from the steam ejection nozzle 50.
[0003]
[Patent Document 1]
Japanese Patent No. 2901951 (page 3, FIG. 8)
[0004]
[Problems to be solved by the invention]
However, this has the following problems.
(1) When a high-temperature gas is sucked by the ejector, the burner, which is a high-temperature gas generating source, and the suction port of the ejector must be connected. Since a misfire occurs and becomes so-called raw gas, a storage furnace 54 for complete combustion is required between the ejector 51 and the burner 53 as shown in FIG. Therefore, trouble is likely to occur in these parts.
{Circle around (2)} Since the vapor injection nozzle 50 and the ejector 51 need to be finely adjusted in position, the structure must be such that the vapor injection nozzle 50 can slide back and forth with respect to the ejector 51 as shown in FIG. Drain water leaks from the gap 55 between them.
{Circle around (3)} Since the ejector 51 suctions high-temperature gas using the steam injection pressure from the steam injection nozzle 50, the mixed gas injection pressure from the injection port 52 of the ejector 51 is determined by the steam injection pressure from the steam injection nozzle 50. The pressure is lower than the pressure, which is only about 0.1 MPa at the maximum, and cannot be said to be sufficient as a crushing force in the processing tank. If there is something that generates some pressure loss on the gas outlet path from the processing tank, it becomes a back pressure for the ejector 51, and the suction amount is drastically reduced. This secondarily affects the crushing power and the stirring power in the processing tank.
{Circle around (4)} Since the storage furnace 54 is interposed between the ejector 51 and the burner 53, and the amount of hot gas sucked by the ejector 51 depends on the steam injection pressure from the steam injection nozzle 50, it is injected into the processing tank. The pressure, amount, temperature, etc. of the high-temperature mixed gas fluctuate greatly due to fluctuations in the steam injection pressure. Further, the mixing ratio between the amount of steam and the high-temperature gas cannot be easily changed.
[0005]
An object of the present invention is to solve such a conventional problem, that is, in addition to the necessity of a storage furnace, no adjustment of the position of a steam injection nozzle is required, there is no leakage of drain water, and a high-temperature mixed gas is used. To provide a pulverizing / drying steam jet injection device which can be injected into a treatment tank at a sufficiently high pulverizing pressure, has a small pressure fluctuation, and can easily change the mixing ratio between the steam amount and the high-temperature gas.
[0006]
[Means for Solving the Problems]
The present invention is a steam jet injection device for injecting a high-temperature gas into a processing tank together with supersonic steam injected from a steam injection nozzle, and crushing and drying the raw material in the processing tank. A high-temperature gas blowing system that blows high-temperature gas as hot air into the processing tank at the same time as supersonic steam from the air, and an air blowing system that blows air in parallel with the high-temperature gas blowing system.
[0007]
In the present invention, a high-temperature gas is blown into the processing tank as hot air from the high-temperature gas blowing system regardless of the steam injection pressure from the steam injection nozzle without using an ejector, and at the same time, air is also blown from the air blowing system. Since the ejector is not used, the various problems described above caused by using the ejector can be solved. Since the steam injection from the steam injection nozzle and the blowing of the high-temperature gas by the high-temperature gas blowing system are separate from each other, they are not affected by the pressure fluctuation, and the mixing ratio between the steam amount and the high-temperature gas can be easily changed. When the gas sent into the processing tank is only hot air of steam and high-temperature gas, the stirring power for stirring the raw material in the processing tank is weak, but the stirring can be promoted by blowing air in parallel from the air blowing system. The air blown in this way also functions as a carrier gas that carries moisture evaporated in the processing tank, blown-off mist, and the like to the outside of the tank.
Further, in the present invention, since a furnace is not required, the cost is low. In addition, the amount of air blown from the air blowing system can be easily changed by an inverter or the like, so that various types of drying can be performed.
[0008]
The present invention preferably has the following forms.
The steam injection nozzle injects supersonic steam from a short distance toward the gas injection port provided near the raw material supply port of the processing tank.The high-temperature gas blowing system and the air blowing system High-temperature gas and air are blown through the gas injection ports from between the injection ports. In the specific embodiment, a short injection pipe is formed between the steam injection nozzle and the gas injection port, and the high-temperature gas blowing system and the air blowing system are opened in the middle of the injection pipe.
[0009]
With this configuration, while maintaining the steam injection pressure from the steam injection nozzle, high-temperature gas and air can be simultaneously injected from the gas injection port into the processing tank, and the raw material supplied from the raw material supply port is changed by the injection pressure. Can be crushed and stirred.
[0010]
A partition is provided in the injection pipe to separate the jet of steam from the steam injection nozzle and the flow of hot gas from the hot gas blowing system.
[0011]
With this configuration, it is possible to prevent the raw material from staying in the space where the steam jet from the steam injection nozzle does not hit, and prevent the raw material from flowing back to the high-temperature gas blowing system.
[0012]
The high-temperature gas blowing system and the air blowing system form the inner and outer double pipes with the former inside and the other outside, which can prevent heat loss from the former pipe and increase the temperature of the former pipe. Can be protected by cooling, and the air in the latter pipe can be heated and blown into the processing tank by heat exchange at that time. If a heat radiating portion is provided between the inner and outer double pipes, it is more effective.
[0013]
If the body of the processing tank is circular and the gas injection port is provided on one side of the lower end of the circular body, the steam, high-temperature gas and air injected into the processing tank will be circular while applying centrifugal force to the raw material. Since it turns along the body, crushing, stirring and drying can be performed efficiently.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the drawings.
[0015]
In FIG. 3, the treatment tank 1 has a drum shape composed of a circular body 1a and side plates 1b on both sides, and the body 1a is partially missing near the lowermost end 1c of the circular body 1a. A gas injection port 2 is formed. A short injection pipe 3 is connected to the outside of the gas injection port 2, and a center line 3o-3o of the injection pipe 3 is parallel to a tangent at the lowermost end 1c of the circular body 1a.
[0016]
A steam injection nozzle 4 is provided inside one end (outer end) of the injection pipe 3. The steam injection nozzle 4 is fixed to the injection pipe 3 by a flange joint 3a outside the injection pipe 3, and is supplied with high-pressure steam through a steam supply pipe (not shown). The steam injection port 4a at the tip of the steam injection nozzle 4 is directed to the center line 3o-3o of the injection pipe 3, and the injected steam is gaseous along the center line 3o-3o as a supersonic saturated steam flow. It is directly injected into the processing tank 1 from the injection port 2.
[0017]
An air outlet 5 is formed on the peripheral wall of the injection pipe 3 at an intermediate position between the steam injection port 4a and the gas injection port 2 of the steam injection nozzle 4, and in this example, the center line 5o-5o of the air injection port 5 is It is perpendicular to the center line 3o-3o of the injection pipe 3.
[0018]
A high-temperature gas blowing pipe 6 of a high-temperature gas blowing system and an air blowing pipe 7 of an air blowing system are provided in the blowing port 5 by forming a double inner / outer pipe with the former inside and the latter outside. Are connected outside. The high-temperature gas blower pipe 6 connects a straight pipe 6a whose center line coincides with the center line 5o-5o of the blower port 5 and a reducer 6b with an elbow in the air blower pipe 7, and connects this reducer 6b to the air blower pipe 7. The straight pipe 6a is opened at the center of the blower port 5 and the reducer 6b is fixed to the burner pipe connection port 7a in the middle of the air blower pipe 7. The high-temperature gas from the burner 8 is injected into the high-temperature gas blowing pipe 6, and further blown into the injection pipe 3 from the high-temperature gas blowing pipe 6.
[0019]
The air blower tube 7 is connected to a blower 10 via a flexible hose 9, and the room-temperature air from the blower 10 cools the high-temperature gas blower tube 6 in the air blower tube 7 to protect it from high heat and The hot air is heated by the heat exchange at that time to become hot air and is blown into the injection pipe 3 together with the high-temperature gas from the high-temperature gas blowing pipe 6. The air blower 7 also serves to prevent heat loss from the hot gas blower 6.
[0020]
When the shape of the air outlet 5 is rectangular, the opening width is much larger than the cross-sectional diameter of the steam jet from the steam injection nozzle 4 (for example, if the cross-sectional diameter of the steam jet is 10 mm, The opening width of the blowing port 5 is 100 mm or more), and no suction force is generated from the blowing port 5 by the steam jet.
[0021]
Although not shown, a raw material supply port is formed in the processing tank 1 at a lower end portion of the side plate portion 1b on the rear side as viewed in the drawing. Although the raw material supply port and the gas injection port 2 have a substantially right-angled opening surface, the distance is short (for example, within 30 cm). Immediately before, it is supplied into the processing tank 1.
[0022]
Since this steam jet injection device is configured as described above, the steam injected from the steam injection nozzle 4 becomes a supersonic saturated steam jet and is straightened from the nearby gas injection port 2 into the processing tank 1. The high-temperature gas (hot air) from the high-temperature gas blowing pipe 6 and the air (warm air) from the air blowing pipe 7 are injected directly into the supersonic saturated steam jet passing straight through the injection pipe 3. The gas is blown into the injection pipe 3 from the middle of the injection pipe 3 at a right angle flow, and is simultaneously injected into the processing tank 1 from the gas injection port 2 according to a supersonic saturated steam jet.
[0023]
Therefore, the supersonic saturated steam, the high-temperature gas and the slightly warmed air are injected from the gas injection port 2 while mixing into the processing tank 1, and the mixed flow is supplied to the raw material supplied from the raw material supply port. Is directly crushed by the injection pressure and the shock wave by the supersonic steam injection, and the raw material is swirled by the centrifugal force along the inner circumference of the circular body portion 1a of the processing tank 1 while stirring, while the latent heat by the high-temperature gas and the saturated steam Dry with both sensible heat. The air from the air blower pipe 7 not only promotes stirring in the processing tank 1 but also functions as a carrier gas for transporting moisture evaporated in the processing tank 1 and blown mist to the outside of the tank.
[0024]
The crushed and dried processed material is sent from a not-shown discharge port provided in the processing tank 1 to a cyclone type collector (not shown) through a pipe connected to the discharge port, and is collected as a dried granular processed material. You.
[0025]
As shown in FIG. 4, a partition plate 11 is provided in a space below the steam jet from the steam injection nozzle 4 and in a space from the tip of the steam injection nozzle 4 to the gas injection port 2. The gas passes through the lower side of the partition plate 11 and enters the treatment tank 1, and the air from the air blower pipe 7 flows out above the partition plate 11. It is possible to prevent the raw material from staying in the space where the jet does not hit, and prevent the raw material from flowing backward to the high-temperature gas blower tube 6 and clogging the same.
[0026]
Further, as shown in FIG. 5, if the heat radiating plate 12 is provided radially between the high-temperature gas blower tube 6 and the air blower tube 7, the protection effect on the high-temperature gas blower tube 6 can be enhanced.
[0027]
When the gas injection port 2 is positioned as shown in FIG. 3 and the steam jet from the steam injection nozzle 4 is injected into the processing tank 1 from here, the centrifugal force due to the steam jet in the processing tank 1 is obtained. Is weakest at the gas inlet 2 where the steam jet has circled along the body 1 a of the processing tank 1, and since the circular shape of the body 1 a collapses at the gas inlet 2, It is preferable that the hot gas and the air from the air blow pipe 7 are blown into the processing tank 1 through the gas injection port 2. This does not prevent the air from being blown from a position different from the steam jet from the steam jet nozzle 4.
[0028]
【The invention's effect】
As described above, according to the present invention, without using an ejector, regardless of the steam injection pressure from the steam injection nozzle, a high-temperature gas is blown from the high-temperature gas blowing system into the processing tank as hot air, and at the same time, the air blowing system is used. The following effects can be obtained because air is blown from the air.
(1) A conventional storage furnace is not required. The trouble caused by providing a storage furnace is eliminated.
{Circle around (2)} Since the position adjustment of the steam injection nozzle is unnecessary and the steam injection nozzle can be fixed at a fixed position, drain water does not leak at the installation position of the steam injection nozzle.
{Circle around (3)} A high-temperature mixed gas can be injected into the treatment tank at a sufficiently high pulverizing pressure. Conventionally, the maximum was about 0.1 MPa, but 1 MPa or 2 MPa is possible. Usually, about 0.3 to 0.5 MPa is sufficient, so that the crushing force can be made 3 to 5 times as compared with the conventional one.
(4) The pressure fluctuation of the jet is small, and the mixing ratio between the amount of steam and the high-temperature gas can be easily changed.
[0029]
According to the second and third aspects of the present invention, while maintaining the steam injection pressure from the steam injection nozzle, the injection pressure can simultaneously inject high-temperature gas and air from the gas injection port into the processing tank, and supply the raw material. The raw material introduced through the mouth can be pulverized and stirred by the injection pressure.
[0030]
According to the invention according to claim 4, since the jet of the steam from the steam injection nozzle and the flow of the high-temperature gas from the high-temperature gas blowing system are partitioned, the raw material is supplied to the space where the steam jet from the steam injection nozzle does not hit. It is possible to prevent stagnation and clogging of the raw material by backflow into the high-temperature gas blower tube.
[0031]
According to the invention according to claim 5, since the high-temperature gas blowing system and the air blowing system are the inner and outer double pipes in which the former is the inside and the latter is the outside, heat loss from the former pipe is prevented. In addition to this, it is possible to cool and protect the former pipe, which becomes high in temperature, and to heat the air in the latter pipe by heat exchange at that time and blow it into the processing tank. According to the invention according to claim 6, since the heat radiating portion is provided between the inner and outer double pipes, it is more effective.
[0032]
According to the invention according to claim 7, since the body of the processing tank is circular and the gas injection port is provided on one side of the lower end portion of the circular body, the steam injected into the processing tank, the high-temperature gas and Since the air swirls along the circular body while applying centrifugal force to the raw material, pulverization, stirring, and drying can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a conventional example.
FIG. 2 is an enlarged view of a part thereof.
FIG. 3 is a partially cut-away configuration view of an embodiment of the present invention.
FIG. 4 is a schematic configuration diagram showing a modified example of a part thereof.
FIG. 5 is a perspective view of an example in which a radiator plate is provided between a high-temperature gas blower tube and an air blower tube.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Processing tank 1a Body part 1b Side plate part 1c Lowermost end part 2 Gas injection port 3 Injection pipe 3a Flange joint 4 Steam injection nozzle 4a Steam injection port 5 Blow port 6 Hot gas blow pipe 6a Straight pipe 6b Reducer 7 Air blow pipe 7a Burner Piping connection port 8 Burner 9 Flexible hose 10 Blower 11 Partition plate 12 Heat sink

Claims (7)

A steam jet injection device for injecting a high-temperature gas into a processing tank together with supersonic steam injected from a steam injection nozzle, and pulverizing and drying the raw material in the processing tank. A steam jet injection device for crushing and drying, comprising: a high-temperature gas blowing system that blows high-temperature gas as hot air into the processing tank at the same time as sonic steam; The steam injection nozzle injects supersonic steam from a short distance toward the gas injection port provided near the raw material supply port of the processing tank.The high-temperature gas blowing system and the air blowing system The steam jet injection device for crushing and drying according to claim 1, wherein a high-temperature gas and air are respectively blown from between the injection ports through the gas injection ports. 3. A short injection pipe is formed between the steam injection nozzle and the gas injection port, and the high-temperature gas blowing system and the air blowing system are opened in the middle of the injection pipe. Steam jet sprayer for crushing and drying. 4. The steam for pulverization and drying according to claim 3, wherein a partition section is provided in the injection pipe to separate a jet of steam from a steam injection nozzle and a flow of high-temperature gas from a high-temperature gas blowing system. Jet injection device. 5. The steam jet for crushing and drying according to claim 2, wherein the high-temperature gas blowing system and the air blowing system form a double inner / outer conduit with the former being inside and the latter being outside. Injection device. 6. The steam jet injection device for crushing and drying according to claim 5, wherein a heat radiating portion is formed between the inner and outer double pipes. The body of the processing tank is circular, and the gas injection port is provided on one side of the lower end of the circular body so that the steam, high-temperature gas and air injected into the processing tank swirl along the circular body. The steam jet injection device for pulverization and drying according to claim 2, 3, 4, 5, or 6, wherein

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