JPS62723A - Pulverized coal feeding device - Google Patents

Abstract

PURPOSE:To obtain highly safe pulverized-coal feeding system, by keeping the system away from the flammable limit by filling all the system with low oxygen gas produced by a gas producer, and by holding the whole system under a pressure which is slightly higher than the atmospheric pressure. CONSTITUTION:Lump coal is fed into a coal pulverizer 3 together with low oxygen gas which is controlled in predetermined temperature. The coal pulverized by the coal pulverizer 3 is separated from exhaust gas by a cyclone separator 10, falling down into the primary pulverized coal bin 16. When a detector 17 detects that the coal has been stored up to a predetermined level in the bin, a damper 15 is closed and the other damper 18 is opened. When a pressure- loading damper 20 is opened at the same time a gas from the separator 10, which has been compressed by a gas compressor 19, is fed into the bin 16, the pulverized coal is transmitted by the pressure of gas, and is fed into a plurality of secondary pulverized coal bins 21. The fed pulverized coal is easily separated from the gas because the gas/pulverized-coal ratio is small and the concentration of gas is high. The pulverized coal stored in the bins 21 is fed into a consumption means 25 by a feeder 26.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to the use of pulverized coal as fuel in pulverized coal supply system in factory equipment equipped with industrial boilers or various combustion furnaces, which are prime mover products. When attempting to use pulverized coal, the pulverized coal production equipment is expensive and not suitable for small volumes, so it would be convenient if pulverized coal could be produced at one location within the factory and supplied to multiple pulverized coal consumption means.

However, since pulverized coal is a dangerous substance that is likely to cause a dust explosion after production, there has been no suitable high safety system in the past, and this has placed restrictions on the use of pulverized coal.

Problems to be Solved by the Invention Therefore, the present invention provides a highly secure centralized production and supply system for pulverized coal to enable a factory with a large number of relatively small volume decentralized pulverized coal consumption means. The purpose is to facilitate the adoption of pulverized coal in facilities (for example, refineries, petrochemical plants, etc.).

Means for Solving the Problems The pulverized coal supply device according to the present invention includes a low oxygen gas generating furnace,
A pulverized coal machine is supplied with low-oxygen gas generated in the same low-oxygen gas generating furnace and adjusted to a predetermined temperature, and pulverized coal is sent from the same pulverized coal machine by gas transport.

A separator that separates the pulverized coal from the gas, a first pulverized coal pin that stores a predetermined amount of pulverized coal separated by the separator, and a gas that is separated from the pulverized coal stored in the first pulverized coal bin by the separator. a second pulverized coal bin provided near the pulverized coal consumption means, which is supplied at least in part by gas conveyance, and which stores the supplied pulverized coal separately from the gas and discharges the gas. .

Operation: According to such a means, a high degree of safety is achieved because the centralized production of pulverized coal, its distribution to each consuming means, and its transfer are all carried out in a low-oxygen atmosphere and are outside the explosive limits.

EXAMPLE Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

In a single figure, lump coal stored in a coal bunker 1 is fed by a feeder 2 to a pulverizer 3 in the required amount. A drying hot gas for obtaining dry pulverized coal is generated in a low-oxygen gas generating furnace 4. That is, fuel is supplied from a fuel (heavy oil) tank 5 through a pump 6 and a regulating valve 7, and air is supplied through a blower 8 and a regulating damper 9 to the gas generating furnace 4, and the gas is combusted to produce high-temperature, low-oxygen gas. be done. The required amount of gas is regulated by the fuel control valve 7 and the air control damper 9, and only the required amount is generated.

Since the gas temperature at the outlet of the gas generating furnace is too high, the required amount of low-temperature gas is regulated by the gas circulation damper 12 from the outlet of the cyclone separator 10 and bag filter 11 that separate the pulverized coal and exhaust gas, and is circulated. The blower 13 mixes the high temperature gas. The pulverized coal produced by the pulverized coal machine 3 is separated from the exhaust gas by the cyclone separator 10 described above. Furthermore, the pulverized coal contained in this exhaust gas is separated by a bag filter 11, and the remaining gas, excluding gas that needs to be reused in the system, is discharged into the atmosphere through a damper 14.

On the other hand, the pulverized coal separated from the gas in the separator 10 passes through the damper 15 and falls onto the pin 16. When the level detector 17 detects that the pulverized coal in this pin has partially accumulated to a certain level, the damper 15 is tightened, the other damper 18 is opened, and the pulverized coal is compressed to 1 to 2 atmospheres by the gas compressor 19. When the gas from the separator 10 is supplied into the pin 16 and the pressure damper 20 is opened at the same time, the pulverized coal is pumped into the gas and thrown into a plurality of pulverized coal bins 21 located away from the pulverized coal manufacturing equipment. . The series of pumping operations in the first pulverized coal bin 16 is controlled by a regulator 22 .

Then, the pulverized coal put into the second pulverized coal bin 21 is
Since the gas/pulverized coal ratio is small and the concentration is high, it is easily separated from the gas and accumulated in the pin 21. The amount of pulverized coal in these pins 21 is detected by a level detector 23, and thereby an input signal for controlling the amount of pulverized coal produced by the pulverized coal production equipment by a pulverized coal production system controller 24 is obtained.

The pulverized coal stored in these pins 21 is then sent to a plurality of boilers or combustion furnaces 25 and feeders 2 as consumption means.
6 to each individual. This supply is connected to the blower 27
This is carried out by air conveyance sent through the adjustment damper 28.

Note that 29 is a bag filter through which the gas separated from the pulverized coal in the chamber 721 passes before being released into the atmosphere.

However, in such a pulverized coal supply system,
Since the entire system from the pulverizer 3 to the pulverized coal bin 21 installed near the pulverized coal consumption means 25 is filled with low-oxygen gas supplied from the gas generator 4, the pulverized coal reaches the explosive limit. It can be achieved and it can be kept safe.

Effects of the Invention As detailed above, according to the present invention, the pulverized coal supply system is entirely filled with low oxygen gas generated in the gas generating furnace, and the entire system is maintained at a pressure slightly higher than atmospheric pressure. Therefore, there is no possibility of air intrusion from outside. Therefore, the pulverized coal in the system can reach explosive limits and is safe. By ensuring safety in this way, it is possible to centralize expensive pulverized coal manufacturing equipment in one location and safely supply pulverized coal to various pulverized coal consumption means scattered within the factory equipment. This will greatly improve the possibility of converting factory equipment to coal.

[Brief explanation of the drawing]

The drawing is a system diagram showing an example of a pulverized coal supply device according to the present invention. 3. Pulverized coal machine, 4. Low oxygen gas generator, 10. Separator, 16. First pulverized coal bin, 21. (7 others)

Claims (1)

[Claims] A low-oxygen gas generating furnace, a pulverized coal machine to which low-oxygen gas generated in the low-oxygen gas generating furnace and adjusted to a predetermined temperature is supplied, and the pulverized coal sent from the pulverized coal machine by gas conveyance is separated from the gas. a first pulverized coal bin that stores a predetermined amount of pulverized coal separated by the separator; and a first pulverized coal bin that stores at least a predetermined amount of pulverized coal separated by the separator. a second pulverized coal bin provided in the vicinity of the pulverized coal consumption means, which is partially supplied by gas conveyance and which stores the supplied pulverized coal separately from the gas and discharges the gas; Feeding device.