JPS6354608B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transport pipe that is particularly effective when transporting various types of granular materials such as pulverized coal in large quantities over long distances using air or other gases.

When powder and granules are transported by a high-pressure, high-concentration transportation device such as a blow tank, a portion of the powder and granules adhere to and accumulate on the inner walls of the transport pipes, increasing pressure loss in the pipes and increasing energy consumption. This effect becomes more significant as the transportation distance becomes longer and the number of curved pipe parts increases.

Particularly in the curved pipe section, that is, the bend section, as shown in FIG.
In addition to this, the particles collide with the inner wall 6 of the outer peripheral part of the bend part, causing local wear of the part, and furthermore, the velocity components of the particles become different due to severe turbulence, which causes particles to easily settle, resulting in pressure loss. Unfavorable phenomena such as an increase in size occur.

As a result, the pressure loss within the transport pipe becomes large and the transport energy increases.

As shown in FIG. 2, the present invention provides a plurality of gas injection nozzles 8 that generate a tangential flow, for example, on the outer periphery 7 on the front side of the bend portion of the transport pipe, and the gas is intermittently or continuously ejected from the nozzles. By letting
A system that generates a gentle swirling flow in the bend section and the pipe after it, prevents local collisions of particles, and makes the flow in the transport pipe on the secondary side of the bend section a uniform streamline to reduce the overall pressure loss. It is.

The swirling flow generating means 8 in the present invention may also be provided on the secondary side of the bend portion.

The swirling flow in the pipe exhibits the same effect in both the vertically curved pipe section and the horizontally curved pipe section.

In addition, in actual transport pipes, the pressure loss in the horizontal straight pipe section also has a large effect, so the fourth
It is effective to employ transport pipes as shown in FIGS.

That is, 10 is an air permeable porous tube made of ceramic or sintered metal. The tube has a required length, and both ends thereof are closed to form a so-called blind tube, and a plurality of tubes are arranged along the conduit and are suitable for injecting a filling material 14 such as cement or synthetic resin. Its lower surface 12 is thus fixed to the tube bottom.

As a result, the lower surface 12 of the porous tube is closed, and the ventilation hole 13 is formed only in the upper surface portion 11. Blowout gas is supplied to each porous tube 10 via a separate control valve 15 .

16 is a gas supply pipe.

The size of the vent surface 11 and the level at which the porous tubes are provided can be easily adjusted by adjusting the amount of filler 14 injected. Any gas, such as booster gas or safety gas, can be discharged intermittently or continuously from this vent hole 13 to reduce pressure loss due to the bottom flow in the transport pipe.

Therefore, by combining the present invention with the above-mentioned horizontal straight transport pipe, any type of transport piping is possible, and in combination, it is possible to provide a transport pipe with extremely low pressure loss as a whole.

[Brief explanation of the drawing]

Fig. 1 is a conceptual diagram showing the behavior of powder flow at the bend of a conventional transport pipe, Fig. 2 is a sectional view of the transport pipe of the present invention, Fig. 3 is a cross-sectional view thereof, and Fig. 4 is a horizontal straight pipe transport A cross-sectional view of the tube, FIG. 5 is a longitudinal cross-sectional view thereof. 2 is a bend portion, 3 is a primary transport pipe, 7 is an outer peripheral portion of the transport pipe, and 8 is a swirling flow generating means.

Claims (1)

[Claims] 1. In a large-diameter transport pipeline consisting of a curved pipe section and a substantially horizontal section, swirling flow generating means for injecting airflow in a tangential direction from the outer periphery of the transport pipe is provided on the upstream side of the curved pipe section. A plurality of blind porous tubes with both ends closed and connected to a gas supply source via a control valve are arranged along the pipe at the bottom of the transport pipe in the horizontal part, and the pipe is filled with fluidity. The material is injected and fixed to bury the bottom of the porous tube in a required amount, and the amount of gas supplied to each of the blind porous tubes is adjusted individually to reduce local wear and pressure loss in the pipe line. Characteristics of large-volume, long-distance transport pipes.