JPS59107115A - Coal feeder for thermal power plant and the like - Google Patents

Abstract

PURPOSE:To improve a coal feed function, by a method wherein a remover for water ahered to coal, which dehumidifies coal by means of the sensible heat of exhaust gas in a burner device, is positioned on the upstream side of a device, such as a silo coal storage device, a coal bunker, or the like, to which coal is supplied. CONSTITUTION:In a remover for water adhered to coal, exhaust gas from a burner device flows in through a lower flow-in port 23a after flowing through a line 8, it rises at the interior of a second chamber (b) and flows to an exhaust outlet 23b, it is guided to a lower flow-in port 23c from the exhaust port 23b. Thereafter, the exhaust gas rises at the interior of a first chamber (a), and is exhausted through an exhaust port 23d, and during said passage, coal is heated thereby to remove adered water, and after exhaust gas from the exhaust port 23d is fed in a cooler 24 of a flow-in port 23e formed in the lower part of a third chamber (c) and is cooled, it rises at the interior of the third chamber (c) to cool coal which is being conveyed, it is exhausted through an exhaust through an exhaust port 23f, and it is fed in a gas disposal device 5 after flowing through a line 9.

Description

DETAILED DESCRIPTION OF THE INVENTION To explain a conventional example of a coal supply device from a lignite unit to a combustion device of a thermal power plant, cement, chemical plant, etc., as shown in Fig. 1, a lignite unit ( α), an open pile device <b> or a silo coal storage device (C) connected via a transfer device (t) such as a conveyor;
a call bunker (d) connected via a transfer device (t);
A crushing device connected to the coal bunker (d), and a combustion device (-) of a thermal power plant or the like supplied with coal from the crushing device.
, a gas processing device for dust removal, desulfurization, denitrification, etc. of exhaust gas connected to the combustion device (e), and! The lignified coal is stored in silos or as open piles from the hopper of the lignite unit (a) by a conveyor (t), and a predetermined amount of coal is transferred from the coal to the coal bunker. Good luck to (d).

After the coal is mixed to a predetermined calorific value, it is pulverized and dried in a pulverizer and then supplied to a combustion device (-), that is, a combustor of a boiler, where it is combusted. After the air is used for preheating, etc., the gas treatment equipment (A) performs dust removal, desulfurization, denitrification, etc., and the chimney (!I)
The structure is such that it is released into the atmosphere.

In addition, coal contains 10 to 20%wt% of water when drained, of which 5 to 20% of water adheres to the surface.
i o wt %, and when piled in open piles, the moisture content increases due to precipitation or freezing of precipitation in cold regions, which becomes the main cause of coal adhesion, sticking, and clogging in coal storage, slow flame, and other equipment.

However, conventional dry coal (moisture removal) is carried out before or during crushing to improve the crushing efficiency of the crusher and the combustion efficiency of the boiler. Moisture adhering during storage or open coal storage is retained as it is, causing coal to adhere, stick, etc. For example, as shown in Figure 2 (
A) As shown in (B), the silo (C) is equipped with a high-pressure air compressor (C1), air piping (C2), an operating knob (C3) (C engineering), and an air jet shell (C4).
(C4)...Attach an air injection device consisting of... to the bottom and bottom of the silo (C)/J! Coal deposits can be removed by installing equipment that injects air into the interior, or by poking with a stick or hitting with a hammer at appropriate times.
Measures have been taken to eliminate sticking, blockage, etc., but the former method requires large-scale equipment that covers a wide area, and has the disadvantage of significantly higher equipment costs and running costs. However, this requires a great deal of effort and time, and there is a risk that the coal adhesion cannot be removed properly and a blockage occurs.If the blockage occurs, the combustion equipment (boiler) This has the drawback that the amount of fuel supplied to the coal mines has been significantly reduced or even stopped, seriously impeding the coal supply function.

The present invention was developed in order to eliminate the above-mentioned drawbacks of conventional coal supply devices, and provides a coal supply device for supplying coal to a combustion device such as a thermal power plant. The present invention is characterized in that a coal adhering water removal device is provided before the coal is supplied to a device such as a silo coal storage device or a coal bunker, which dehumidifies the coal by the sensible heat of the exhaust gas in the combustion device, and its purpose is , removing moisture adhering to the coal at a stage before the various devices that cause coal adhesion, sticking, clogging, etc. in the coal feeding equipment;
And by using the sensible heat of the combustion exhaust gas for the removal,
The object of the present invention is to provide a coal supply device for a thermal power plant, etc., which has an improved coal supply function by adding a relatively small device with low running cost.

The present invention has the above-mentioned configuration, and provides a coal adhering water removal device that dehumidifies coal by sensible heat of exhaust gas in a combustion device before supplying coal to a device such as a silo coal storage device or a coal bunker in a coal supply device. As a result, moisture adhering to coal in various equipment such as silo coal storage equipment, transfer equipment, coal bunker, etc. in the coal supply equipment is significantly reduced, and coal adhesion and sticking in these equipment is generally and efficiently reduced. In addition to eliminating blockages and significantly improving the coal supply function, this coal adhesion water removal device is significantly smaller in size and reduces the sensible heat of exhaust gas compared to conventional systems in which a device for removing coal adhesion and sticking is installed in the various devices described above. Utilization results in significant savings in equipment and running costs.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 6 and FIG. 4 show a first embodiment of the present invention, in which a silo coal storage device (including indoor coal storage) is provided, and (1) in the figure shows a lignite device, ( 2) is a coal adhesion water removal device, (3) is a silo coal storage device, (4) is a coal bunker, crushing device, and combustion device, (5) is a gas treatment device for exhaust gas such as tin base, desulfurization, and denitrification, (6) (c) A chimney, in which a transfer device (sword) consisting of a hopper, a chute, etc. is provided between each of the devices, and the lignified coal is transferred from the lignite device (1) by the transfer device (7), with coal adhering to it. The structure is such that the water is sent in the order of water removal equipment (2), silo coal storage equipment (3), coal bunker, crushing equipment, and combustion equipment, or boiler (4). After the sensible heat is supplied from the device (5) to the coal adhesion water removal device (2) via the pipe line (8) and used to remove the coal adhesion water, the exhaust gas is returned to the gas treatment device (5). It has a structure in which it is introduced through a conduit (9).

In addition, as shown in FIG. 4, the coal adhering water removal device (2) is operated in the direction of the arrow (as shown in the figure) after the coal transported by the transfer device t7J, that is, the conveyor, is once stored in the hogs (21). Grid conveyor (22) moving to the right side)
The coal is cut upward and moved in the direction of the arrow to be sent to the rear transfer device (7) on the right side in the figure, and the coal on the conveyor (22) is moved in the longitudinal direction surrounding the conveyor (22). Pass through the hood (23) that forms the 1st chamber (a), 2nd chamber (b), and 3rd chamber (/→), which are divided into
The exhaust gas from the combustion device passes through the pipe (8) and enters the lower inlet (23a). It enters the second chamber (B) and reaches the outlet (23b), and is guided from the outlet (23b) to the lower inlet (23C) and enters the first chamber (A). Rise up and open the discharge port (23d, ″)
During this time, the coal is heated and the water adhering to it is removed.
Cooler (24 g) at the inlet (23 g) provided at the bottom of the chamber
) and is cooled, then rises in the 6th chamber (c) to cool the coal being transferred and is discharged from the discharge port <23f), passing through the pipe (9) to the gas shown in Figure 3. The structure is such that it is introduced into a processing device and subjected to gas treatment.

In addition, the exhaust gas from the combustion device flows from the pipe (8) to the inlet (2).
3C), the outlet (Th), the inlet (23a), and the outlet (23k).

Since the first embodiment shown in Figs. 6 and 4 has the above-described configuration, for example, in a 100 x 10'KW thermal power plant, approximately 400 t/h of coal with a calorific value of 6000 Kcal/9 is consumed. Yes, the exhaust gas amount is 3.5X
10 Nm37m (however, the amount discharged from the coal gunker or silo is about 10001!/A), and the exhaust gas is often released into the atmosphere at a temperature of about 150C; The exhaust gas contains about 10 cm of moisture and has a dew point of about 70 to 1300, and the sensible heat possessed by the exhaust gas has a specific weight of 1.3 kg/Nm3.
Specific heat is 0.32 KcavkgC, 3.5x 10'x1.3xO per C, filter 2 = 14.5x10
5 (Kcal/ht:').

The coal used has 10 to 20 inches of moisture, but the amount of moisture adhering to the surface of the coal, which causes clogging in the slow flame, coal storage, etc. If it is 5 or less, the blockage can be resolved. Therefore, the amount of heat required to remove about 5% of the moisture from the amount of consumed coal is:
Assuming that the enthalpy required for evaporation is 570 KcalACg, 1000X 103X0.05X570=28.5
X 106Kcal/h.

Therefore, if the entire amount of exhaust gas is used, it is sufficient to lower the exhaust gas temperature by 20U, and if the temperature drop of the exhaust gas is 10DC, the exhaust gas temperature will be reduced by approximately 20qIJ, or 7.0
X sum 5N, 3/A may be used. In this case, about 20 parts of the amount of exhaust gas released into the atmosphere is extracted, and the exhaust gas is introduced to the popular port (23a) in Fig. 4 for gas treatment again. Device(
5), the desired purpose can be achieved by simply lowering the exhaust temperature on the device (5) side by 9C.

In addition, since the exhaust gas in the combustion device, that is, the boiler's feed water preheater (not shown) is about 40 DC, the temperature drop is about 60 DC.
If air is extracted from this section at 0C, the above-mentioned numerical value A, that is, approximately 6 degrees of air is required, and the coal adhering water removal apparatus can be further downsized. Note that the cooling of the coal in the sixth chamber (c) is to lower the temperature and pressure to a level where there is no risk of spontaneous combustion.

Therefore, according to the first embodiment, the silo coal storage device (3
), a coal adhering water removal device (2
), and in order to remove the water adhering to the coal by the device (2), a subsequent transfer device (7), a silo coal storage device (3), a coal bunker, and a crushing device (4) are installed to reduce the moisture adhering to the coal. It is possible to effectively reduce coal adhesion and adhesion in general and prevent blockages, significantly improving the coal supply function, and the coal adhering water removal device (2) is significantly smaller than the conventional example, and the exhaust gas is reduced. Since the sensible heat of

Therefore, the combustion device, ie, the boiler, can operate smoothly and its efficiency can be greatly improved.

Next, FIG. 5 shows a second embodiment of the present invention, which is a case of open pile coal storage. ), open pile coal storage device (30), transfer device (7), coal adhesion water removal device (
2), a transfer device (7), a coal bunker, a crushing device and a combustion device (4), a gas treatment device (5), and a chimney (6) are arranged, and the coal adhering water removal device (2) of this embodiment is as follows: In addition to the specific example shown in FIG. 4, structures such as those shown in FIGS. 6 and 7 can also be used.

Fig. 6 shows another embodiment of the coal adhering water removal device, in which coal is supplied from the feed pipe (41) and the lattice floor of the tank (40)
42) The exhaust gas introduced above and supplied from the pipe line (8) into the inlet (43) on the lower side of the tank (4o) is
), the coal rises through the coal, heats it, removes water, and then passes through the upper exhaust port (44) and is sent to the gas treatment device (5) via the pipe (9), while the water is removed. It has a fluidized bed structure in which the coal is taken out from the discharge port (45).

In addition, Fig. 7 shows another embodiment of the coal adhering water removal device,
Coal is supplied from the upper shoe (51) into the tank (50), where it is stored in the lower hopper and flows down to the pipe (8).
The exhaust gas from the header (52) is supplied to the lower part of the coal in the tank (50), and after the coal is heated and water removed, it is passed through the exhaust port (
54) and sent to the gas treatment device +5),
On the other hand, the coal from which water has been removed is taken out from the lower damper (55), which has a hook-type structure.

Therefore, in the other embodiments shown in FIGS. 6 and 7, the same effects as in the first embodiment shown in FIGS. 6 and 4 can be obtained except for the cooling function. Note that the apparatuses shown in FIGS. 6 and 7 can also be applied to the coal adhering water removal apparatus (2) shown in FIG. 3.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

Figure 1 is a mechanism diagram showing a conventional coal supply device for thermal power plants, etc. Figure 2 is a mechanism diagram showing an example of a device for removing coal adhesion and sticking in the silo coal storage device shown in Figure 1 FIG. 4 is a mechanism diagram showing an embodiment of the coal adhering water removal device shown in FIG. 6; FIG. 5 is a mechanism diagram showing a second embodiment of the invention. The mechanism diagram of the coal supply device, FIGS. 6 and 7 are mechanism diagrams showing other embodiments of the coal adhering water removal device. 1: Lignite equipment 2: Coal adhesion water removal equipment 3: Silo coal storage equipment 4 Nicole bunker, crushing equipment, combustion equipment 5: Gas treatment equipment 7: Transfer equipment 8.9: Pipe line 30: Sub-agent for open nozzle equipment Patent attorney: Shige Okamoto (2 persons)

Claims (1)

[Claims] In a coal supply device that supplies coal to a combustion device such as a thermal power plant, before the coal is supplied to a device such as a silo coal storage device or a coal bunker in the coal supply device, the coal is dehumidified by sensible heat of the exhaust gas in the combustion device. A coal supply device for a thermal power plant, etc., characterized by being equipped with a coal adhesion water removal device.