JPH05339586A - Coal drying equipment - Google Patents

Abstract

PURPOSE:To provide the title equipment whereby crushed coal can be more uniformly dried. CONSTITUTION:The title equipment consists of a vertical closed oven body 5; a plurality of open-top overflow weirs 52 arranged along the vertical axis of the oven body and partitioning its lower space; open-bottom submerged weirs 51 arranged opposite to the right sides of the respective overflow weirs 52; hopper-shaped gratings 110 provided in the lower parts of the spaces partitioned by the overflow weirs; high-temperature air supply pipes 90 connected to the lower parts of the hopper-shaped gratings; a crushed coal feed pipe 4 connected to the lower part of the leftmost space partitioned by the overflow weirs; a dry coal discharge overflow pipe 12 connected to the upper part of the rightmost space partitioned by the overflow weirs; and an air discharge pipe 15 connected to the upper part of the oven body, the grating on the side left to each.submerged weir being blinded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coal drying facility applied to a fluidized bed coal gasification furnace or the like.

[0002]

2. Description of the Related Art A conventional device will be described with reference to FIG. A hopper-type plate 11 is provided at the lower end of the rectangular parallelepiped closed furnace body 5. The outlet valve 20 is provided at the lower end outlet of the plate 11.
The residual coal discharge pipe 19 having the above is connected. An air supply pipe 9 is connected to the lower part of the plate 11 via a blower 6 and a heater 7.

The crushed coal hopper 1 is connected to the lower part of the furnace body 5 above the plate 11 by the crushed coal supply pipe 4 via the constant quantity feeder 3. The dry coal hopper 13 is connected to the central portion of the furnace body 5 by the overflow pipe 12. The upper end of the furnace body 5 is connected to the air discharge pipe 15 via a bag filter 16.

In the figure, 17 is a dry coal delivery valve, and 18 is a delivery pipe.

In the above, the crushed coal 2 having a high water content is continuously supplied to the furnace main body 5 via the constant amount feeder 3.
In the furnace body 5, high temperature air heated by the heater 7 is supplied from below. The hot air creates a fluidized bed 120, the crushed coal is dried, and flows into the hopper 13 through the overflow pipe 12 as dry coal 14.

[0006]

In a conventional fluidized bed type drying furnace in which wet coal is continuously supplied and dry coal is continuously discharged in an amount commensurate with the supply, the particle size of wet coal varies. I
Alternatively, there is a difference in the time taken for the supplied wet coal from the inlet to the outlet, that is, in-reactor retention time (drying time) due to uneven flow conditions in the furnace. As a result, there is a difference in the degree of drying of water, which causes problems such as a bridge when the dried coal is discharged from the hopper and clogging in the pipe.

On the other hand, the high-temperature air that evaporates the water content in the wet coal while passing through the fluidized bed 120 in the drying furnace as bubbles passes through the fluidized bed 120 only once, and as it is from the air outlet pipe. Since it is discharged, it still has thermal energy and its thermal efficiency was poor.

Further, wet coal (crushed coal) includes pulverized coal of several microns to a size of about 5 millimeters. When used as dry coal, pulverized coal of several microns is cut to some extent. There are times when you want to have a uniform dry particle size.

[0009]

The present invention takes the following means in order to solve the above problems.

That is, as a coal drying facility, (1) a furnace body having a closed vertical body, a plurality of overflow weirs arranged along the vertical axis of the furnace body and having an upper end opened to define a lower space, and the respective overflows. A submerged weir, which is arranged so as to face the same direction of the weir, and has a lower end opened, a hopper-type eyelet provided in the lower part of the space defined by each of the overflow weirs, and a lower portion of the hopper-type eyelet of the same. A high temperature air supply means provided in the same direction, a dry coal discharge means provided in an upper part of the one space on the same direction side of the two spaces partitioned by the overflow weir in the same direction, and the two Of the one space, it comprises a crushed coal supply means provided in the lower part of the other space, and an exhaust gas means provided in the upper part of the partitioned space, and the same direction of each of the submerged weirs of the hopper type plate. The opposite of the plane The surface side to the closed pores. (2) Vertical mold closed body, crushed coal supply port at the bottom, dry coal discharge port at the top, hopper-type plate at the bottom, hot air supply port at the bottom of the hopper-type plate, and upper end A plurality of furnace bodies each having a high temperature air outlet, a crushed coal supply means, and a high temperature air supply means, and the crushed coal supply means, the high temperature air supply means, and the furnace bodies are connected in series. It

[0011]

[Action]

(1) In the above-mentioned means (1), the space defined by each overflow weir of the furnace body becomes a fluidized bed. That is,
The crushed coal is supplied from the lower part of one divided space, and in the divided space, it flows upward while being dried with hot air,
It flows over the overflow weir and flows to the side of the submerged weir in the adjacent compartment space. Here, the eye plate has closed holes, so the upward flow of hot air is small. Therefore, the crushed coal descends and flows from the lower end of the submerged weir to the opposite side. Then, similarly to the above, the upward flow of the hot air from below causes the upward flow while being dried. After that, the same operation is performed to reach the partitioned space provided with the dry coal discharging means, in which the crushed coal is uniformly dried and flows into the dry coal discharging means.

As described above, since the residence time in the fluidized bed in each compartment is almost the same, the variation in the water content of the dry coal flowing into the dry coal discharging means is reduced. Therefore, it is possible to prevent problems such as bridging and clogging in the subsequent process. (2) The crushed coal supplied from the crushed coal supply means is dried by high temperature air in the furnace body connected in series, and flows upward. Then, it flows into the next furnace body. In this way, the crushed coal is successively dried, and is uniformly dried when it leaves the furnace body at the final stage. In addition, high-temperature air also flows in series in each furnace body, so that sufficient heat exchange is performed, and the overall thermal efficiency is improved.

[0013]

【Example】

(1a) A first embodiment of the invention of claim 1 will be described with reference to FIGS. 1 is an overall system diagram, FIG. 2 is a detailed diagram of a furnace main body, and FIG.

The parts described in the conventional example are designated by the same reference numerals and the description thereof will be omitted, and the parts relating to the present invention will be mainly described.

In FIG. 1, the lower part of the rectangular parallelepiped closed furnace body 50 is divided into three sections by an overflow weir 52 along the vertical axis, that is, the side wall. The upper end of the overflow weir 52 is open. A submerged weir 51 having a lower end opened and an upper end opened is provided so as to face the right surface of each overflow weir 52.

At the lower end of the space defined by each overflow weir 52, a hopper-type perforation 110 is provided. Further, as shown in FIG. 2, the left surface side of the submerged weir 51 of the hopper type eye plate 110, that is, the left end portion of the eye plate 110 is closed as shown in FIG.
Use blind plate 5.

At the lower end of each overflow weir 52, a supply pipe 90 branched from the air supply pipe 9 on the outlet side of the heater 7.
Are connected via a flow rate adjusting valve 92 and a flow meter 91.
The payout pipe 19 is connected to the lower end of each of the plates 110.

The outlet of the constant quantity feeder 3 is connected to the lower left end of the furnace body 50 by a crushed coal supply pipe 4. Also the furnace body 5
An overflow pipe 12 is connected to the upper right end of 0.

In the above, the space defined by each overflow weir 52 of the furnace body 50 becomes a fluidized bed. That is,
The crushed coal 2 is supplied from the lower left part, and in the partitioned space at the left end,
While being dried by high temperature air, it flows upward and flows over the overflow weir 52 and flows into the side of the submerged weir 51 in the adjacent partitioned space. Since the eye plate 110 is closed here, the upward flow of high temperature air is small. Therefore, the crushed coal descends and flows from the lower end of the submerged weir 51 to the right side. Here, the upward flow of high-temperature air from the lower side causes an upward flow while being dried. In the same manner, the crushed coal is uniformly dried in the right end compartment space and flows into the dry coal hopper 13 from the overflow pipe 12.

As described above, since the crushed coal flows while being dried in the fluidized bed divided into a plurality of sections, the retention time of the crushed coal in the furnace body becomes almost uniform, and the water content of the dried coal varies. Becomes smaller. Therefore, it is possible to prevent problems such as bridge formation and clogging in the subsequent process. (1b) A second embodiment of the invention of claim 1 will be described with reference to FIGS.

The difference from the first embodiment is as follows. The upper end of each submerged weir 51 is closed, and each upper end of the upper space of the furnace body 50 partitioned by each submerged weir 51 is connected to the inlet of the cyclone 56 by the exhaust pipe 55. Furthermore, each cyclone 5
The outlet of 6 is connected to the air exhaust pipe 15.

In the above, the exhaust of the high temperature air which forms the plurality of fluidized beds 120 in the furnace body 50 passes through the exhaust pipes 55, respectively, and the pulverized coal in the exhaust air is recovered by the cyclone 56, and the bag filter 16 It is exhausted to the outside of the system through the.

When a sufficient high temperature air flow rate is supplied to one of the plurality of fluidized beds 120, the fine powder in the crushed coal rises and is carried to the cyclone 56 together with the exhaust air, and the cyclone 56. Will be collected at. Therefore, the particle size of the dry coal sent to the hopper 13 is uniform. (2) An embodiment of the invention of claim 2 will be described with reference to FIG.

The parts described above are given the same reference numerals and the description thereof is omitted, and the parts relating to the present invention will be mainly described.

A rectangular parallelepiped closed furnace body 5a, 5b, 5c
3 are provided. A hopper-type plate 11 is provided at the lower end of each furnace body 5a, 5b, 5c.

Each furnace body 5a, 5b, 5c is provided with a crushed coal inlet a at the bottom and an outlet b at the top. See also 1
A hot air inlet c is provided below 1, and an outlet d is provided at the upper end.

The constant quantity feeder 3, the heater 9 and each furnace body 5
a, 5b, 5c are connected in series. That is, the constant quantity feeder 3 is connected to the crushed coal inlet a of the furnace body 5a. After that, the furnace bodies 5b and 5c are sequentially connected by the overflow pipe 12.

The heater 7 is also connected to the hot air inlet c of the furnace body 5c. After that, the order of the furnace bodies 5b and 5a (reverse order)
Then, the exhaust pipes 15 are sequentially connected.

In the above, the high temperature air (about 100 to 120 ° C.) heated by the heater 7 is supplied to the fluidized bed 12 of the furnace body 5c.
0c and then into the air chamber 10b of the furnace body 5b through the air discharge pipe 15. At this time, the hot air is about 90 ° to 11 °
It is 0 ° C. This hot air passes through the fluidized bed 120b,
It enters the air chamber 10a of the furnace body 5a through the air exhaust pipe 15. The hot air at this time is about 70 ° to 90 °. This high temperature air passes through the fluidized bed 120a and passes through the air discharge pipe 15
Leading to. At this time, the high temperature air 21a has a temperature of 30 ° to 40 ° C. This hot air is released to the atmosphere through the bag filter 16.

On the other hand, the crushed coal 2 has a surface water content of 10 to 12% and reaches the fluidized bed 120a through the crushed coal supply pipe 4. Here, water is dried to 5-6% and overflow pipe 1
2 overflows and reaches the fluidized bed 120c through the overflow pipe 12b. Here, it is uniformly dried to a water content of 2 to 3%, and stored as dry coal in the dry coal hopper 13 through the overflow pipe 12.

In this way, the hot air is dried to some extent and is sent from the fluidized bed on the outlet side having a small water content to the wet coal having a large water content on the inlet side. For this reason, the chances of passing through the fluidized bed increase, and the chances of moisture drying increase accordingly, so that the thermal efficiency for drying improves.

[0032]

【The invention's effect】

(1) As described above, according to the invention of claim 1, the crushed coal is fluidized and dried by the high temperature air in each of the plurality of spaces partitioned by the overflow weir, and then moved to the next space. Therefore, the crushed coal leaving the last space is dried uniformly. Therefore, in the subsequent steps of the dry coal, no bridges are formed and no clogging occurs, and smooth operation of the entire plant becomes possible. (2) As described above, according to the invention of claim 2, the crushed coal is fluidized and dried by the high temperature air in each of the plurality of furnace bodies connected in series, and transferred to the next furnace body. Therefore, the crushed coal leaving the last furnace body is uniformly dried.

Further, high-temperature air also passes through each furnace body in series and sufficiently exchanges heat with the crushed coal, so that the thermal efficiency is improved.

[Brief description of drawings]

FIG. 1 is an overall configuration system diagram of a first embodiment of the invention of claim 1.

FIG. 2 is a detailed view of the furnace body of the same embodiment.

FIG. 3 is a view taken along the line AA of FIG. 2 of the same embodiment.

FIG. 4 is an overall configuration system diagram of a second embodiment of the invention of claim 1;

FIG. 5 is a detailed view of the furnace body of the same embodiment.

FIG. 6 is an overall configuration system diagram of an embodiment of the invention of claim 2;

FIG. 7 is an overall configuration system diagram of a conventional example.

[Explanation of symbols]

 1 Crushed coal hopper 3 Fixed amount feeder 5, 5a, 5b, 5c Furnace body 6 Blower 7 Heater 13 Dry coal hopper 16 Bag filter 50 Furnace body 51 Submerged weir 52 Overflow weir 91 Flow meter 92 Air control valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Koji Ogawa 5-717-1, Fukahori-cho, Nagasaki-shi Nagasaki Research Institute, Mitsubishi Heavy Industries, Ltd.

Claims (2)

[Claims] 1. A vertical closed furnace body, a plurality of overflow weirs which are arranged along the vertical axis of the furnace body and open at the upper end to define a lower space, and the overflow weirs on the surfaces in the same direction. Submerged weirs that are arranged facing each other, open at the lower end, hopper-type eyelets provided in the lower part of the space defined by each of the overflow weirs, and high-temperature air supply means provided below the respective hopper-type eyelets And, among the two spaces partitioned by the overflow weir most distant in the same direction, the dry coal discharging means provided in the upper part of the one space on the same direction side, and the other of the two spaces among the two spaces. A crushed coal supply means provided in the lower part of the space, and an exhaust gas means provided in the upper part of the partitioned space, and a surface side opposite to the same direction surface of each of the submerged weirs of the hopper type plate. A stone characterized by a closed hole Charcoal drying equipment. 2. A vertical mold closed body, a crushed coal supply port at the bottom,
Pulverized coal supply with multiple furnace bodies each having a dry coal discharge port at the top, a hopper-type plate at the lower end, a hot air supply port below the hopper-type plate, and a hot air discharge port at the upper end And a high temperature air supply unit, wherein the crushed coal supply unit, the high temperature air supply unit, and the furnace bodies are connected in series.