JPS6374817A - Method of transporting particle members by gas - Google Patents

Abstract

PURPOSE:To transport particle members continuously while drying them, by using a twist pipe having a pipe wall provided with a required number of twist grooves defined thereon in the transportation of the particle members to produce a turning flow of a gas an a transportation medium. CONSTITUTION:A twist pipe 1 is used as a transportation pipe for particle members which is provided with three twist grooves 2 with a pitch P defined on a pipe wall in a its axial direction. A gas preheated by a heat exchanger or the like and having a high temperature is supplied into the twist pipe 1 by a blower to be used as a medium for transporting and drying the particle members. When a fluid flows in the twist pipe 1 in its axial direction, a speed component is produced in the fluid itself in an circumferential direction by the action of the twist groove 2 of the twist pipe 1 so that the fluid advances spirally along the twist groove 2 in the twist pipe 1. The particle members in the twist pipe 1 are combined and stirred in a spiral state by the gas having the high temperature and transported to a next process without depositing on a bottom of the pipe while they are dried continuously.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for transporting gas of powder or granular material.

[Prior Art] Generally, in the pharmaceutical industry, chemical industry, food industry, etc., there is a need for transportation means to transport powder and granules to be dried, which are used as raw materials for various products and for other purposes, from storage tanks, etc. to the next process. It is.

Conventionally, one of the methods for transporting powder and granular materials is a gas transport method. The gas transport method involves passing a transport medium such as air through a transport pipe, mixing the powder or granules to be transported into the medium, and transporting the medium along with the flow of the medium to a desired location.

In general, gas transportation methods can transport powder and granules with high efficiency, but when the concentration of powder and granules is increased, the phenomenon of accumulation of powder and granules at the bottom of the tube occurs, so it is difficult to transport powder and granules. It is necessary to lower the mixing ratio or increase the gas flow rate. Therefore, the flow rate of the transport medium must be increased;
The capacity of the blower becomes large, and running costs inevitably become large.

In addition, if the powder or granular material is wet, a block state may occur, making it impossible to transport. For this reason, sufficient drying is required to transport the powder or granular material in gas, and a separate drying device is required, making the equipment complex.

Conventionally, as a transportation method that attempts to solve the above-mentioned inconvenience, a circular tube connecting each device is rotated and heated to reduce the flow resistance of the powder while stirring and drying the powder. There was a way to do it.

[Problems to be Solved by the Invention] However, in the method of rotating and heating a circular tube as described above, the circular tube must be rotatably supported, and sealing of the support part is also a problem, and the A drive device is also required. Furthermore, the heating device must be installed along the circular tube, which still leaves problems such as the device becomes complicated and the equipment cost increases.

Means for Solving Problem E] The present invention has been made for the purpose of solving the above-mentioned problems of the conventional art. The present invention is characterized in that the provided twisted pipe is used as a transport pipe for the powder and granular material, and the powder and granular material is transported while creating a swirling flow in the gas of the transport medium by the twisted groove.

[Function] The twisted grooves provided on the pipe wall surface can give a swirling flow to the high temperature gas, so the high temperature gas and the powder and granules are mixed and stirred efficiently, and the powder and granules are continuously dried. transportation.

[Example] Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, a twisted pipe l having three twisted grooves 2 with a pitch p in the pipe axis direction on the pipe wall surface is used as a transport pipe for powder and granules, and a heat exchanger (not shown) is used. A blower (not shown) passes preheated high-temperature gas through
It is fed into a twisted tube l using a method such as the above, and is used as a medium for drying and transporting powder and granules.

When a fluid flows in the axial direction of the twisted pipe 1, a circumferential velocity component is generated in the fluid itself due to the action of the twisting force 2 of the twisted pipe 1, and the fluid flows inside the twisted pipe 1 into a twisted groove. 2 in a spiral pattern.

Based on the above-mentioned action, by using high-temperature gas as the fluid, the powder and granules in the twisted tube 1 are mixed and stirred in a spiral shape by the high-temperature gas, and are prevented from being deposited on the tube bottom (and being continuously dried). while being transported to the next process.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and various changes may be made without departing from the gist of the present invention, such as the pitch and number of threads of the helical grooves being able to be selected in various ways. Of course.

[Effects of the Invention] As described above, according to the present invention, the twisted grooves provided on the pipe wall surface give a swirling flow to the high-temperature gas and promote mixing and agitation of the high-temperature gas and the powder. The mixing ratio of the particles becomes uniform, making it possible to transport highly concentrated powder and granules. Furthermore, since high-temperature gas is used as the transport medium, combined with the promotion of mixing and agitation, effective continuous drying of the powder and granular material can be performed, and a rotating device for the transport pipe is not required, reducing equipment costs, etc. Demonstrates excellent effects.

[Brief explanation of the drawing]

FIG. 1 is an external view of a twisted tube used in an embodiment of the method of the present invention, and FIG. 2 is an enlarged view showing the cut end surface taken along the line ■-■ in FIG. ■ indicates a twisted pipe, and 2 indicates a twisted groove.

Claims (1)

[Claims] 1) A twisted tube in which twisted grooves of the required pitch and number of threads are provided in the tube axis direction on the tube wall surface is used as a transport tube for powder and granular materials, and the twisted grooves create a swirling flow in the gas of the transportation medium while the powder is transported. A method for gas transportation of powder or granular material, characterized by transporting granular material.