JPH0239549Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to an improvement in a spray drying device that sprays sample droplets into a high-temperature air stream and instantaneously dries them.

(Prior Art) As a conventional spray drying apparatus, there is one shown in FIGS. 4 and 5, for example.

In FIG. 4, reference numeral 1 denotes a passage member for feeding hot air, and this passage member 1 consists of an upper cylinder 2 and a duct 3 connected to a side wall of the upper cylinder 2. A spray nozzle 4 for spraying sample droplets is disposed within the upper cylinder 2, and this spray nozzle 4 opens into the chamber 5. A distributor 6 is interposed between the chamber 5 and the upper cylinder 2, the spray nozzle 4 passes through the distributor 6, and the spray nozzle 4a is connected from the distributor 6 to the chamber 5.
It protrudes inward. A rectifier plate 7, which is penetrated by the spray nozzle 4, is attached to the upper cylinder side of the distributor 6. The rectifying plate 7 is made of stainless steel and has a disc shape with a thickness of 0.5 mm, and as shown in FIG. 6, a through hole 7a for the spray nozzle 4 is formed in the center thereof. Further, small holes 8 having a diameter of 3 mm are formed in the rectifying plate 7 at a pitch of 5 mm over the entire surface in a staggered pattern of 60 degrees. As shown in FIG. 5, the distributor 6 to which the rectifying plate 7 is attached has an annular and double blow-off hole 9 having a diameter of 6 mm centered on the spray nozzle 4.

Air is heated to a predetermined temperature by a heater (not shown) to produce hot air, and this hot air is rectified by a rectifier plate 7 from the passage member 1 and sent into the chamber 5 from the blow-off hole 9 of the distributor 6. be provided. The hot air fed into the chamber 5 becomes a high-temperature airflow, and sample droplets are sprayed from the spray nozzle 4 into this high-temperature airflow. These sample droplets are instantaneously dried by a high-temperature air current, and the dried sample, which has become fine particles, is placed in the chamber 5.
is discharged from an outlet (not shown) and collected.

At this time, the flow of hot air near the nozzle 4a is controlled so that the sample droplets are sprayed into the high-temperature airflow, dried, and become fine particles that adhere to the nozzle 4a of the spray nozzle 4 and get stuck in the nozzle 4a. The current is rectified by a current plate 7.

(Problem to be solved by this invention) However, in such a conventional spray drying device, the hot air sent from the passage member 1 into the chamber 5 flows through a circular rectifier plate 7 formed in a thin plate. The air was blown out through the small hole 8 and from the blow-off hole 9, which had a small passage cross-sectional area. For this reason, the blowing speed of hot air blown out from the blow-off holes 9 becomes faster, and since the blow-off holes 9 are concentrated in a narrow area, the hot air flows near the blow-off holes 9, that is, near the spout 4a. was in disarray. Therefore, the sample, which has been dried and turned into fine particles, is transferred to the nozzle 4a by hot air.
Attach to. The amount of adhesion gradually increased, and the dried sample clogged the nozzle 4a, resulting in a problem that the spraying operation of the spray nozzle 4 became defective.

(Configuration for Solving Problems) In order to solve these conventional problems, this invention includes a passage member for feeding hot air and a spraying method for spraying sample droplets provided in this passage member. A spray drying apparatus comprising: a spray nozzle that opens, a chamber in which the spray nozzle opens, and a rectifying plate disposed between the chamber and a passage member to rectify the hot air supplied to the chamber. The plate has a honeycomb structure with many regular hexagonal small holes.

(Function) In this device, the hot air sent into the chamber from the passage member passes through the rectifying plate, but the hot air has a larger passage area than the conventional one, with many regular hexagonal small holes formed therein. Since the hot air passes through the honeycomb structure and the small holes are long, the hot air is sufficiently rectified by the rectifying plate. Therefore, although the hot air that has been rectified by the current plate is blown into the chamber 11 by the distributor, the flow of the hot air near the spout of the spray nozzle is not disturbed much.

(Example) This invention will be explained below based on the drawings. 1 to 3 are diagrams showing an embodiment of the spray drying apparatus according to this invention.

First, the configuration will be explained.

In FIG. 1, reference numeral 11 denotes a passage member for supplying hot air, and the passage member 11 is connected to a substantially cylindrical upper cylinder 13 provided on the upper frame 12 of this device and a fitting part attached to the side wall of this upper cylinder 13. The duct 15 is fitted into the section 14. A heater (not shown) is disposed on the upstream side of the duct 15 to heat the supplied air to a predetermined temperature and turn it into hot air. A spray nozzle 16 for spraying sample droplets is disposed inside the upper tube 13, and a distributor 18, which is approximately disk-shaped and has a center hole 17, is attached to the lower end of the upper tube 13. A rectifying plate 19 for rectifying the hot air sent from the passage member 11 is provided in the center hole 17.
is fitted and attached to the distributor 18.

As shown in FIG. 2, the rectifying plate 19 has a central hole 20 formed therein, is a 25 mm thick aluminum disk-shaped plate, and has a honeycomb structure in which a large number of regular hexagonal small holes 21 are formed adjacent to each other. There is. In this honeycomb structure, as shown in Fig. 3, the distance between the opposing sides of the regular hexagonal small holes 21 is 3 mm, and the length of the wall between adjacent small holes 21 is 0.03 mm. .

The spray nozzle 16 passes through the center hole 20 of the current plate 19, and its nozzle 16a protrudes from the lower end surface of the current plate 11.

On the other hand, a substantially cylindrical chamber 22 is placed on a lower frame (not shown) of this device so that the nozzle 16a is located at the center of the upper end, and the upper frame 12 is brought into contact with the upper end of the chamber 22. The chamber 22 is then fixed to the lower frame.

Next, the effect will be explained.

Air is heated to a predetermined temperature by a heater to form hot air, and this hot air is rectified by a rectifier plate 19 from the passage member 11 and is sent into the chamber 22 .
The hot air fed into the chamber 22 becomes a high-temperature airflow, and sample droplets are sprayed from the spray nozzle 16 into this high-temperature airflow. The sample droplets are instantaneously dried by the high-temperature air current, and the dried sample particles are discharged from an outlet (not shown) of the chamber 22 and collected.

The hot air sent into the chamber 22 from the passage member 11 passes through the rectifier plate 19, but this hot air passes through a honeycomb structure in which a large number of regular hexagonal small holes 21 are formed and whose passage area is larger than that of the conventional one. , Also, since the length of the small hole 21 is long, the rectifier plate 1 is used for hot air.
The rectifying effect of 9 is sufficiently effective. Therefore, although the hot air rectified by the rectifier plate 19 is blown into the chamber 22 from the center hole 17 of the distributor 18, the flow of the hot air near the center hole 17, that is, near the nozzle 16a, is not disturbed much. do not have. As a result, the sample that has been dried into fine particles does not adhere to the nozzle 16a due to the turbulence of the hot air, and the spraying operation of the spray nozzle 16 is good.

(Effects of the invention) As explained above, according to this invention, the current plate has a honeycomb structure in which many regular hexagonal small holes are formed, so the hot air regulated by the honeycomb structure is not disturbed much. There is no. Therefore,
The sample, which has been dried into fine particles, will not adhere to the spray nozzle nozzle due to the turbulence of the hot air.
The mist operation of the spray nozzle is good.

[Brief explanation of drawings]

1 to 3 are views showing an embodiment of the spray drying apparatus according to this invention, FIG. 1 is a sectional view of this apparatus, and FIG. 2 is a plan view of a rectifying plate of this apparatus. FIG. 3 is a partially enlarged view of this current plate.
4 to 6 are diagrams showing a conventional spray drying device, FIG. 4 is a sectional view of this device, FIG. 5 is a view taken along the V arrow in FIG. 4, and FIG. 6 is a view of this device. FIG. 11... Passage member, 16... Spray nozzle, 19
... rectifier plate, 22 ... chamber.

Claims (1)

[Scope of utility model registration request] A passage member for supplying hot air, a spray nozzle provided in the passage member for spraying sample droplets, a chamber into which the spray nozzle opens, and a chamber disposed between the chamber and the passage member for supplying the sample droplets to the chamber. 1. A spray drying apparatus comprising a rectifying plate for rectifying supplied hot air, wherein the rectifying plate has a honeycomb structure in which a large number of regular hexagonal small holes are formed.