JPH06184564A - Powder transport pipe - Google Patents

Abstract

PURPOSE:To provide the subject pipe whose damage can be automatically detected and which can prevent the inside carrier gas from jetting when it is damaged. CONSTITUTION:The objective pipe has a double-pipe structure formed by covering the entire external periphery of a powder transport pipe with an external pipe so as to leave a space like a sealed container therebetween and a pressure sensor which measures the pressure in the intermediate space of the double-pipe structure is attached to the external pipe. When the transport pipe is pierced with a leak due to wear and the gas leaks, the pressure in the intermediate space increases and the detected pressure informs the formation of a leak. Even when this detection is made, the gas jetting from the leak can be kept from leaking outside; therefore the operation can be continued till the time suitable for exchange or repair.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder transportation pipe used for gas transportation of powder to a high temperature and high pressure facility such as a coal gasification furnace.

[0002]

2. Description of the Related Art For example, as described in Japanese Patent Publication No. 4-55634, the supply of pulverized coal to a coal gasifier is quantitatively cut from a pressurized hopper with a rotary feeder, and then, It is pressurized, conveyed by a transportation pipe and ejected.

The transport speed of pulverized coal in this transport pipe is several 1
The inner wall surface of the transport pipe is worn by 0 m / sec for a long time, and in particular, in the curved pipe portion, the outer wall surface of the curved pipe on which fine powder collides is locally worn, and finally, Piping has holes and needs to be replaced.

Conventionally, this wear hole is confirmed by visually observing the ejection of pulverized coal when a wear hole is formed in a pipe, and immediately stopping the furnace immediately. However, if this discovery is delayed, there is a risk of backflow of coal gas.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a powder transport pipe which automatically detects breakage and does not cause harmful gas to be ejected to the outside due to the breakage. .

[0006]

SUMMARY OF THE INVENTION According to the present invention, an outer pipe body is arranged on the outer peripheral surface of a powder transport supply pipe main body so as to cover the entire outer peripheral surface of the powder transport supply pipe main body, and a closed container-like space is provided in the middle. This is a powder transport tube having a formed double tube structure and having a pressure sensor for measuring the pressure in the intermediate space of the double tube structure attached to the outer tube body.

The powder transport pipe of the present invention can effectively achieve its object by applying it to a curved pipe portion where the wear and thickness loss of the powder transport supply pipe is severe.

As the pressure sensor, any simple sensor can be used as long as it can detect a pressure increase in the sealed intermediate space.

Further, the present invention is applied to a powder transport supply pipe where abrasion and wall thinning locally occur extremely, a bypass pipe is provided in advance, and the pressure sensor is used as a pressure sensor with a transmitter to increase the pressure. By the detection signal indicating
By automatically switching the supply pipe at that location to the bypass pipe, the operation can be continued without stopping the powder supply.

[0010]

When the powder is transported by using the carrier gas as the carrier, if the transport pipe body is worn and a hole leaks, the pressure in the intermediate space of the double pipe rises, and the pressure is detected to cause wear. Occurrence of holes is detected. Further, even by this detection, the gas ejected from the wear hole does not leak to the outside, so that the operation can be continued until an appropriate time for replacement and repair.

[0011]

FIG. 1 shows an embodiment of the present invention, in which the present invention is applied to a pulverized coal transportation pipe of a coal gasification furnace for thermally decomposing pulverized coal to obtain a fuel gas.

In the figure, the pulverized coal in the hopper 1 is
After being cut out quantitatively by the feeder 2, the carrier gas pressurized by the ejector 3 conveys the inside of the transport pipe 4 and supplies it from the burner 5 into the gasification chamber 6. The pulverized coal supplied into the gasification chamber 6 reacts with the oxidant in the gasification chamber 6 and is thermally decomposed to generate combustible gas. The generated gas rises in the gasification chamber 6 and is solidified by the cyclone 7. The separated gas is sent to the gas purification facility. On the other hand, the ash content in the coal after being gasified is slagified and flows down into the water-cooled slag chamber 8 to be granulated slag and discharged outside the system.

Reference numeral 9 denotes a curved pipe portion of the pulverized coal transportation pipe 4, which has a double pipe structure according to the present invention, and 10 denotes a pressure sensor attached to the curved pipe portion 9, and the pressure sensor The pressure fluctuation detected by the sensor 10 is displayed on the pipe breakage indicator 11.

FIG. 2 shows a sectional structure of the bent pipe portion 9 of the pulverized coal transportation pipe 4.

As shown in the figure, the outer peripheral surface of the curved tube body 12 of the transport tube 4 is surrounded by an outer tube body 14 through a closed space 13, and the outer tube body 14 has A pressure sensor 10 for measuring the pressure in the closed space 13 is attached.

In the figure, the curved pipe body 12 of the transport pipe is shown.
However, when the rupture hole is opened due to abrasion due to friction with the transport powder, the pressure sensor 10 detects a pressure change.
The gas ejected from the rupture hole 2 is sealed in the closed space 13 by the outer tube body 14 and does not eject to the outside.

Therefore, the pressure sensor 10 detects the pressure increase in the closed space 13 due to the formation of the broken hole in the curved pipe main body 12, and the pipe breakage indicator 11 shown in FIG. Even if is displayed, the gas ejected from the rupture hole does not go out to the outside, so it is not necessary to immediately stop the operation, and when the operation is complete, it is possible to stop the operation and repair the pipe. it can.

Further, by providing a bypass pipe in advance in a transportation pipe portion where the wall thickness is locally greatly reduced by abrasion and switching to the bypass pipe, the operation can be continued without stopping.

[0019]

The present invention has the following effects.

(1) Since it is possible to form a sealed double pipe at a portion that is easily damaged, powder, gas, etc. do not leak to the outside even if the main body breaks, and there is a margin for repair and replacement. be able to.

(2) Since the main body is damaged by the leak detection due to the pressure, the detection accuracy is excellent and reliable.

(3) Since harmful gas does not leak to the outside, the safety of equipment operation is high.

[Brief description of drawings]

1 shows an embodiment of the present invention, showing an example in which the present invention is applied to a pulverized coal transportation pipe of a coal gasification furnace for thermally decomposing pulverized coal to obtain a fuel gas.

FIG. 2 shows a sectional structure of a bent pipe portion of the pulverized coal transportation pipe of FIG.

[Explanation of symbols]

1 Hopper 2 Feeder 3 Ejector 4 Transport Pipe 5 Burner 6 Gasification Chamber 7 Cyclone 8 Water Cooling Slag Chamber 9 Transport Pipe Curved Pipe 10 Pressure Sensor 11 Pipe Damage Indicator 12 Curved Pipe Main Body 13 Closed Space 14 Outer Pipe

Claims (1)

[Claims] 1. An outer tube body that covers the entire outer peripheral surface of the supply pipe main body with a space provided on the outer peripheral surface of the powder transport supply pipe main body, and a closed container shape is provided between the supply pipe main body and the outer pipe body. A powder transport tube with a double tube structure that forms a space, and a pressure sensor that measures the pressure in the intermediate space of the double tube structure is attached to the outer tube body.