JPS61240024A - Conveyer equipped with coal drying device - Google Patents

Abstract

PURPOSE:To eliminate the bridging and adhesion of coal in a coal bunker and the like, utilize the heat of exhaust gas and consequently contrive to simplify a device by a method wherein the exhaust gas of a boiler is lead in a conveyer in a course to feed coal to the boiler so as to dry the coal under transfer. CONSTITUTION:Fine coal, which is fed to a coat pulverizer 8 while being metered with a measuring stoker 7, is supplied to a boiler. The air 14, which is heated through the heat-exchange between the exhaust gas 10 from the boiler 9 and the air 12 sent with a pressure fan 11 in a regenerative air preheater 13, is supplied to the boiler 9 and the coal pulverizer 8, while the exhaust gas past through the regenerative air preheater 13 is sent through a dust collector 15 to a smoke stack 17. Some portion (hot air of about 300 deg.C) of the exhaust gas past through an induced draft fan 16 is sent to the hot air supplying port 19 of a conveyer 5 with a booster fan 18 so as to ascend the interior of a conveyer trunk in order to evaporate the moisture adhered to coal. Consequently, the properties of the coal to be fed to a coal bunker 6 is improved and the evaporated moisture is discharged together with the exhaust gas 22 from a coal feeding port 23 to the atmosphere.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to coal transfer conveyors used in coal-fired boiler installations.

Conventional technology Conventionally, coal-fired boiler equipment is configured to cut pulverized coal from a coal bunker and supply it to the boiler via a pulverized coal barrel. No drying process was performed.

Problems that the invention aims to solve With such a conventional configuration, the adhering moisture content of the pulverized coal supplied to the pulverized coal machine can reach as much as 15% during rain, and bridging is likely to occur in the coal bunker. Undesirable phenomena occur, such as adhesion of pulverized coal to the coal feeding and weighing machine, and an increase in the temperature of the dry air inside the pulverized coal machine.

The present invention can be applied to WI3111 without using any special equipment.
It is an object of the present invention to provide a transfer conveyor with a coal drying device that can dry coal in a coal supply route to a boiler with a configuration that allows the coal to be fed to a boiler.

Means for Solving the Problems A transfer conveyor with a coal drying unit according to the present invention is characterized in that exhaust gas from the boiler is drawn into the conveyor in the coal supply route to the boiler.

Function: With this configuration, the coal is dried during transfer using the heat value of the exhaust gas, thereby eliminating bridging and adhesion in coal bunkers, etc., and simplifying the apparatus by effectively utilizing the heat value of the exhaust gas.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 and 2.

Figure 1 shows coal-fired boiler equipment. The coal feeding route is such that coal brought in by a truck (1) first passes through a coal hopper (2).
) and is sorted by 9 (31), and those with large particle sizes are sent to the coal hopper (2) again via the crusher (4).The powdered coal sorted by the sieve (3) is transferred to the transfer conveyor
The coal is fed into the coal bunker (6) via the coal feeder (7) and fed to the pulverized coal m(8) while being weighed via the coal feeder (7). Pulverized coal from the pulverizer (8) is supplied to the boiler (9). The boiler (9) and the pulverizer (8) include:
Warmed air α4 is supplied by exchanging heat with the exhaust gas aO of the boiler (9) and the air (2) sent in by the forced fan υ in the regenerative air preheater (2). The exhaust gas that has passed through the regenerative air preheater (2) is sent to the chimney (b) by the induction fan αG via the dust collector (b).

In addition, part of the exhaust gas that passed through the induction fan @ [hot air 300
degree C] is sent to the hot air supply port α of the transfer conveyor (5) via the booster fan (total).

The transfer conveyor (5) is constructed as shown in Fig. 2, and the hot air supply port (to) opens into the conveyor trunk, and the fed exhaust gas (a) flows into the inside of the conveyor trunk (2). The coal rises and is discharged from the coal injection port (c) to the coal bunker (6). During this time, the conveyor trunk (
2) The moisture adhering to the coal transferred inside the coal bunker (6) is exposed to the exhaust gas and evaporates, improving the properties of the coal that is fed into the coal bunker (6). The evaporated moisture is released into the atmosphere from the coal injection port (E) along with the exhaust gas υ.

゛In the above embodiment, the exhaust gas was sent from the stage after the dust collector (to) to the transfer conveyor (5). A similar effect can be obtained by configuring the data to be sent to (5).

As described in the detailed description of the invention, the coal drying device-equipped transfer conveyor of the present invention is configured to draw exhaust gas from the boiler into the conveyor in the coal feeding route to the boiler and dry the coal during transfer using the exhaust gas calorific value. Coal being transported can be dried without the use of special equipment, and it is possible to prevent bridging in coal bunkers, prevent adhesion in coal feeding and weighing machines, and prevent temperature increases in the drying air in the pulverizer.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a block diagram of coal-fired boiler equipment, and FIG. 2 is a partially cutaway perspective view of the transfer compactor P shown in FIG. 1.

Claims (1)

[Claims] 1. A transfer conveyor with a coal drying device configured to draw the exhaust gas from the boiler into the conveyor in the coal supply route to the boiler and dry the coal during transfer using the heat value of the exhaust gas.