JPS6066011A - Feeder for pulverized coal - Google Patents

Abstract

PURPOSE:To adjust the quantity of air fed to a combustion apparatus, and to improve combustion efficiency by mounting a vent port discharging one part of hot air into atmospheric air in a piping connecting a pulverized coal-hot air mixture discharge port for a pulverizer and the combustion apparatus. CONSTITUTION:A valve, an opening thereof can be adjusted freely, is fitted between a fan 17 in a piping 15 and an ejector 10, a vent port 19 for discharging one part of hot air into atmospheric air, and the quantity of air toward a combustion apparatus 18 through the ejector 10 is adjusted by opening and closing the valve. When the quantity of air at a comparatively low temperature fed to the combustion apparatus 18 is too much and the ratio A/C of the air to pulverized coal is too large, A/C can be reduced when the valve for the vent port 19 is opened and one part of hot air is made to escape into atmospheric air.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a pulverized pulverized coal supply device that supplies pulverized coal pulverized by a pulverizer to a combustion device using air pressure together with hot air for drying during pulverization.

[Prior art]

The hot air supply port of the pulverizer, which finely grinds and pulverizes granules such as coal, cement, and chemicals, is equipped with hot air that is fed into the pulverizer, and the fine powder that has been pulverized by the pulverizer is passed through the hot air. A hot air device is often attached to dry and discharge the air outside the machine. When this type of pulverizer is used for pulverizing coal, the pulverized coal discharged by the action of the hot air device is not stored in the pulverized coal hopper, but is instead sent to the pulverizer through the supply device for combustion. It is often the case that the apparatus is directly connected and a mixture of pulverized coal and hot air is supplied pneumatically to the combustion apparatus.

However, in conventional supply devices, the crusher and combustion device are directly connected by piping equipped with a fan and cyclone, etc., and the air from the crusher at a low temperature of, for example, 80°C, is
Although it is used in large enough quantities to transport pulverized coal,
Since the entire amount of the pulverized coal is sent to the treatment combustion equipment, there is a problem in that the combustion efficiency is significantly reduced due to an excessive amount of low-temperature air. When crushing coal with poor crushability as indicated by the patented hard glove index, the ratio A/C between the amount of air and the amount of pulverized coal increases, and if the crushability is poor, a large crusher is required. was adopted, making it impossible to reduce the amount of air to an extreme extent, and as a result, the A/C value was further reduced, further reducing the combustion efficiency.

[Summary of the invention]

The present invention was made in view of the above points.

If a vent is installed in the piping that connects the pulverized coal/hot air mixture outlet of the crusher and the combustion device to release a portion of the hot air into the atmosphere, the amount of air sent to the combustion device can be reduced. The purpose of the present invention is to provide a pulverized pulverized coal supply device that improves combustion efficiency by making it possible to adjust the combustion efficiency. EMBODIMENT OF THE INVENTION Below, one embodiment of the present invention will be described in detail based on the drawings.

〔Example〕

The figure is a schematic configuration diagram showing an embodiment of the pulverized pulverized coal supply device according to the present invention. A conveyor-type coal feeder 4 that conveys falling granular coal and supplies it to the chute entrance of the crusher 1 is attached. The pulverizer 1 pulverizes granulated coal supplied from a chute to the center of a horizontal rotary table between the rotary table and a roller that is pressed against the upper surface of its outer periphery and rotates drivenly. The granulated coal is configured to be lifted up by hot air blown from below the rotary table through its surroundings. 5 is a hot air generator, and 6 is an air duct connecting the crusher 1 and the hot air generator (not shown).

A duct 8 is connected to the pulverized coal/hot air mixture discharge lower of the pulverizer 1 configured as described above, and the other end is equipped with a bag filter to separate the pulverized coal and hot air mixture into pulverized coal and hot air. It is connected to the charcoal collection device 9. Reference numeral 10 denotes an ejector, and this ejector is connected to the pulverized coal discharge port 11 of the pulverized coal collection device 9 by a pipe 12, and there is a pipe 12 that prevents air from passing through. An aerodynamic mechanism 13 is provided. Further, the hot air outlet 14 of the pulverized coal collection device 9 and the ejector 10 are connected by a pipe 15. Inside the pipe 15, there is a pulp 16 for opening and closing the pipe, and a pulp 16 for directing the hot air to the ejector 10. A fan 17 is provided to feed the air. Furthermore, ejector 1
0 is connected to a burner 18a of a combustion device 18 such as a kiln or boiler, and the pulverized coal sent through the pipe 12 is supplied to the burner by hot air pressure from the pipe 15 and is combusted. ing. Between the fan 17 of the pipe 15 and the ejector 10, there is provided a vent 19 which is equipped with pulp whose opening degree can be adjusted freely and which discharges a portion of the hot air into the atmosphere. The amount of air flowing to the combustion device 18 via the evacuator 10 is adjusted. In addition, for example, 300 to 4
00" high temperature secondary air is introduced to increase combustion efficiency.

The operation of the pulverizer configured as above and the supply device for pulverized coal pulverized by the pulverizer will be explained. When granular coal is supplied to the bunker 2 and the shutter 3 is opened, the granular coal falls, is conveyed by the coal feeder 4, and is supplied to the chute of the crusher 1. The supplied granular charcoal falls through the chute to the center of the rotary table, is not pressed against the rotary table and its outer periphery, and is then caught between the rotary table and a driven rotating roller to be pulverized. Hot air blows downward from the rotary table 1 through the air duct 6 and from the annular space between the circular trowel of the table 1 and the casing, causing the lead to be crushed. The pulverized coal is dried by the hot air and is mixed with the hot air and discharged from the discharge lower. When this mixture is sent to the pulverized coal collection device 9 through the duct 8, it is separated into pulverized coal and hot air, and the pulverized coal is discharged from the discharge port 11 and passed through the pipe 12 through the air mechanism to the ejector. Head to 10.

Further, the hot air discharged from the discharge port 14 is sent to the ejector 10 by the air blower 1T by opening the pulp 16.

The hot air at this time is relatively low temperature, for example, 80°C.The pulverized coal and the hot air under pressure are thus fed to the ejector 10, so the pulverized coal is transported along with the hot air by the pressure of the hot air. It is supplied to the burner 18a of the combustion device 17 and burned.

However, the hot air at this time is relatively low temperature, for example, 80°C, and if there is too much of this hot air, the combustion efficiency in the combustion device 1B will decrease.

If the amount of relatively low temperature air fed to the combustion device 18 is too large and the ratio A/C of this and pulverized coal is too large,
The A/C can be reduced by opening the pulp of the vent 19 and allowing some of the hot air to escape into the atmosphere. In this case, the amount of hot air varies depending on the amount of pulverized coal discharged from the crusher 1, and the A/C also differs depending on the case, but the A/C is usually 1.5 by weight. ~4. and 1
For example, 70% of the exhaust air volume from the crusher 1 is transferred to the ventilator 19.
The remaining residue is sent to the burner 18m of the combustion device 18, and the pulverized coal is efficiently burned in the combustion device 18 together with the secondary air of 300 to 400'C supplied to the combustion device 18.

In this embodiment, since the pulverized coal collection device 9 is provided with a bag filter, the pulverized coal does not flow toward the fan 17, thereby preventing the pulverized coal from being worn out. Since a high-efficiency fan 1T can be installed, the amount of air consumed per unit can be reduced.

〔Effect of the invention〕

As is clear from the above description, in the pulverized pulverized coal supply device according to the present invention, a portion of the hot air is provided in the pipe connecting the pulverized coal/hot air mixture discharge port of the pulverizer and the combustion device. By installing a ventilator that discharges into the atmosphere, the amount of hot air supplied can be freely adjusted, even when pulverizing not only normal coal but also coal that has poor pulverization properties and sending it to the combustion equipment with hot air. Since the amount of air can be set to an appropriate amount relative to the amount of pulverized coal, the amount of air will not become excessive and the combustion efficiency will be significantly improved.

[Brief explanation of drawings]

The figure is a schematic configuration diagram showing an embodiment of the pulverized pulverized coal supply device according to the present invention. 1...Crusher, 6...Air duct, 7...
Pulverized coal/hot air mixture outlet, 8...Duct, 9...
...Pulverized coal collection device, 10...Ejector, 11...
...Pulverized coal discharge port, 12゜15...Piping, 14...
・Hot air outlet. 1T...Fan, 18...Combustion device, 19...-
... Ventro. Patent applicant: Ube Industries Co., Ltd. Agent Masaki Yamakawa (Kiku 1st)

Claims (1)

[Claims] A pulverized pulverized coal supply characterized in that a vent for discharging a part of the hot air into the atmosphere is provided in a mixture separation and supply passage connecting a pulverized coal/hot air mixture discharge port of a pulverizer and a combustion device. Device.