Powder supply device and powder supply method
a technology of powder supply device and powder supply method, which is applied in the direction of liquid transfer device, transportation and packaging, light and heating apparatus, etc., can solve the problems of trouble in combustion furnace, and undershooting of powder flow rate of powder supply device, etc., to achieve rapid reduction of powder flow rate and suppress the effect of undershooting of powder flow ra
Inactive Publication Date: 2015-01-22
DIAMOND ENG
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Benefits of technology
The present invention aims to provide a powder supply device and method that can quickly reduce the powder flow rate while preventing it from going too low.
Problems solved by technology
In the occurrence of a trouble in the combustion furnace to which the pulverized fuel is supplied, the mode of the powder supply device may become a rapid load reduction mode where the powder flow rate needs to be rapidly reduced.
Even in the rapid load reduction mode, however, the instant reduction of the powder flow rate may apply load to the combustion furnace, which may result in the trouble of the combustion furnace.
In this case, the rapid reduction of the powder flow rate may be failed if the powder flow rate is reduced under the aforementioned feedback.
Method used
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Embodiment Construction
[0025]A preferred embodiment of a powder supply device and a powder supply method according to the present invention will be described in detail below with reference to the drawings.
[0026]FIG. 1 is a diagram showing the powder supply device according to the embodiment of the present invention.
[0027]As illustrated in FIG. 1, a powder supply device 1 mainly includes: a feed tank 11 that supplies a predetermined amount of pulverized fuel such as pulverized coal; a pressure equalizing tank 12 that stores the pulverized fuel to be supplied to the feed tank 11; an internal pressure gas supply pipe 32 that is connected to the feed tank 11 and conveys the internal pressure gas to be supplied to the feed tank 11; an internal pressure control valve 22 that is connected to the internal pressure gas supply pipe 32 and adjusts the pressure in the feed tank 11; a powder delivery pipe 31 that conveys the pulverized fuel supplied from the feed tank 11; a powder discharge valve 21 that is connected ...
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In a rapid load reduction mode for reducing a flow rate of powder to be supplied to the outside of a feed tank to a predetermined rate after a predetermined period of time, a controller sets an internal pressure control valve to an exhaust state and closes a powder discharge valve to a predetermined aperture, and as soon as the powder flow rate becomes smaller than a scheduled powder flow rate that is expected before elapse of the predetermined period of time, the controller controls at least one of the internal pressure control valve and the powder discharge valve so that the powder flow rate becomes the scheduled powder flow rate.
Description
TECHNICAL FIELD[0001]The present invention relates to a powder supply device and a powder supply method, which can suppress the undershooting of the powder flow rate while reducing the powder flow rate rapidly.BACKGROUND ART[0002]Combustion furnaces for burning pulverized fuel such as pulverized coal supplied from powder supply devices are known as combustion furnaces used in blast furnace facilities, thermal power plants, and the like. In such combustion furnaces, the pulverized fuel is burned while the pulverized fuel is jet into the combustion furnace together with air. A method of combustion with the use of the pulverized coal as the pulverized fuel has been widely popular because, for example, the coal itself has high combustibility.[0003]A gas-carried powder supply device that conveys pulverized fuel with carrier gas is known as a powder supply device for supplying pulverized fuel to a combustion furnace. In this powder supply device, the pulverized fuel in a feed tank is supp...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F23K3/00
CPCF23K3/00F23K3/02F23K2203/006F23K2203/103F23K2203/104F23K2203/201
Inventor SHIMONO, KIMIHIROTAKEDA, TAKAHIROTERAOKA, KAZUTOSHIKASAGI, FUMIHITO
Owner DIAMOND ENG