JP2000081208A - Method for removing water of incineration residue carried out from wet slag removing device by machine and the device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for decreasing the water content of an incineration residue conveyed from a combustion chamber to a water tank of a wet slag removing device and carried out from there using a mechanical conveyance medium and a device in which the water content of the incineration residue conveyed from the combustion chamber to the slag removing device is decreased. SOLUTION: An incineration residue conveyed to a wet slag removing device 12 via a slag ventilation cylinder is conveyed from a water bath 16 in a water tank 14 of the wet slag removing device 12 by a mechanical conveyance medium 20. At that time the heat loss of the incineration residue is restricted to a minimum by a thermal insulation 15 at the water tank 14 wall of the wet slag removing device 12 and a thermal insulation floating body 17 of the water bath 16. The incineration residue at a distal end area 25 of a conveyance section 26 is conveyed from the mechanical conveyance medium 20 to on a filter net 32 of a pressure reducing device 34. There, the water accompanied with and conveyed from the wet slag removing device 12 is removed based on a vacuum that is in close contact with the filter net 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a water content of incineration residue which is sent from a combustion chamber to a water tank of a wet slag removing device and discharged therefrom by using a transport medium of a machine according to the general concept of claim 1. And a device for reducing the water content of the incineration residue conveyed from the combustion chamber to the wet slag removal device according to the generic concept of claim 10.

[0002]

2. Description of the Related Art For example, incineration residues from garbage incineration facilities are
The incineration residue is transported from the combustion chamber to a wet slag remover to minimize the load of debris during subsequent work steps, such as cooling after the combustion process, relay storage and further transport. The wet slag removing device includes a water tank having a water bath for taking in and cooling incineration residues. At that time, the incineration residue takes in a great deal of water. When the incineration residue is carried out of the wet slag removing device using a transport medium of a machine, for example, when carried out using a chain slag removing device described in DE-A 3731 140, the water is also carried. This is undesirable, especially because of the increased weight of the incineration residue containing water.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to reduce the water content of the incineration residue discharged from a wet slag removal device using a transport medium of a machine in a cost-effective and economical manner. It is in.

[0004]

This object is achieved by a method according to the features of claim 1 and by an apparatus according to the features of claim 10.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In accordance with the present invention, water is removed using a decompression device while incineration residues are carried out of a water tank having a water bath of a wet slag removal device on a conveyance section using a conveyance medium of a machine. Is done. This method has the advantage that the water removal can be carried out continuously in a relatively small space, for example proceeding rapidly as opposed to water removal by gravity.

[0006] The incineration residues are advantageously conveyed on a filter network which forms part of the conveying section of the decompression device. With a reduced pressure of from 0.1 bar to 0.9 bar, the water of the incineration residue is removed by passing through this filter network. The reduced pressure also sucks in air or vapors that carry water away from the incineration residue. An airflow of 10 to 100 Nm ³ / t incineration residue has proved to be particularly effective in that case. In this case, the amount of air changes depending on the type and composition of the incineration residue. Furthermore, steam suction offers the advantage that the temperature of the incineration residue can be kept at a high level during the water removal by the hot steam.

[0007] A portion of the incineration residue carried on the filter net preferably remains on the filter net as a permanent slag bed.
This slag bed facilitates the maintenance of reduced pressure and is used as an additional filter.

[0008] By periodically cleaning the filter net with compressed air and / or pressurized water, it is possible to prevent the filter net from becoming clogged. This washing is advantageously performed from the back of the filter mesh opposite the slag bed, so that the permanent slag bed is not broken. It has been found to be particularly advantageous when using compressed air from the back of the filter network, as not only the filter net is washed by the compressed air, but also the slag bed is loosened.

If the incineration residue is conveyed on a filter network of a decompression device at a temperature of 60 ° C. to 95 ° C., the mechanical removal of water in the incineration residue is relatively small at this temperature. Can be. Water is easily removed. From 70 ℃
A temperature of 80 ° C. has proven to be particularly advantageous.

[0010] The temperature of the incineration residue within the range of the filter net
The reaction step from 60 ° C. to 95 ° C. is to avoid low-temperature blowing of incineration residues, for example, during the last stage of the combustion process in the combustion chamber. This is achieved by preheating or reducing the primary air at the end of the combustion chamber. Further, since at least the wall of the water tank of the wet slag removing device is insulated and the water bath in the water tank is covered with a heat insulating floating body that also prevents moisture evaporation, heat loss in the wet slag removing device is minimized.

[0011] The water sucked from the incineration residue by the decompression device is returned to a water tank in the wet slag removing device using a pump. In this way the consumption of water in the wet slag removal device can be reduced.

[0012] An apparatus for removing water from incineration residues discharged from a wet slag removing device by a machine is provided.
With a decompression device suitable for For example, whether there is a chain slag remover or a plate-like slag remover, or other mechanical transport media for transporting incineration residues, in any case, the decompression device uses a filter network as part of the transport section. To send incineration residues. For example, additional transport sections, which are important when existing facilities are equipped with decompression devices for replenishment, are not required.

The water is preferably received in a water tank mounted on the back of the filter net, or in a funnel-shaped suction chamber. This suction chamber is connected to a wet slag removing device on a pump.

[0014] The filter net is mounted down, preferably opposite the conveying surface of the conveying section defined by the conveying medium of the machine. A portion of the incineration residue carried on the filter screen can then form a permanent slag bed on the filter screen, on which further incineration residue to reduce the water content can be carried.

In an advantageous embodiment, the filter network has openings of up to 10 mm in diameter, preferably 5 mm in diameter,
It preferably extends conically across the back of the filter net. The opening thus formed significantly prevents clogging of the opening.

[0016] In a further embodiment, there is provided a nozzle adjusted towards the back of the filter net, with which the filter net can be flushed with compressed air and / or pressurized water from the back. The inflow of the compressed air can also be performed on the exhaust port of the suction chamber. Therefore, a valve for controlling the compressed air is opened and a second valve for controlling the decompression is closed in the pipe connecting the exhaust port with the decompression pump. Further advantageous embodiments are the subject of further, dependent claims.

[0017]

An embodiment will be described with reference to the drawings. Figure
1, the incineration residue 11 carried out from the wet slag removal device 12
An apparatus 10 for removing the water content from water is shown in the figure. Within a water tub 14 of the wet slag removal device 12 provided with walls 13, 13 ', 13 "having heat insulation 15, there is a water bath 16 covered with an insulating floating body 17, for example a foamed glass sphere. A slag cylinder 18 protrudes into the water bath 16, whereby the incineration residue 11 reaches the wet slag removing device 12 from the combustion chamber 19.
The floating body 17 is allowed to cool down in the water bath 16 and the incineration residue 11 resulting therefrom.
This incineration residue 11 eventually reaches a temperature of 60 ° C. to 95 ° C., which is an ideal temperature for water removal, since it prevents very large heat losses.

The primary air 1 supplied into the end region 19 ′ of the combustion chamber 19 is preheated or suppressed to reduce the incineration residue 11.
Is brought into the wet slag remover 12 at an elevated temperature compared to the incineration residue 11 from the usual combustion process, whereby it is easy to reach a temperature of 60 ° C. to 95 ° C., which is favorable for water removal. it can.

The incineration residue 11 is conveyed from the wet slag removing device 12 from the floor wall 13 ′ of the water tank 14 through the wall 13 ″ of the wet slag removing device 12 that extends diagonally upward using the transport medium 20 of the machine. In the embodiment shown here, as a comparison also in FIG. 3, a chain type slag removing device 21 having a chain 23 passing over a chain wheel 24 in a guide groove 22 as a transport medium 20 is shown. The diagonal wall 13 "forms a part of the conveying section 26, and within its end section 25, the filter network 32 of the decompression device 34 forms a part 25 'of the conveying section 26.

There is a lightly flooded barrier 31 at the level of the water surface, so that the insulating floating body 17 is not carried out of the water bath 16 together with the incineration residues 11 by the transport medium 20 of the machine.
17 prevents it from exiting to the oblique wall 13 "and thereby reaching the area of the transport section 26. This barrier 31 can be fixed to the side wall or lid of the wet slag removal device 12, for example a plate or fixed curtain. It can be formed in shape.

A transport section 26 extends between the water bath 16 and the filter net 32 along the oblique wall 13 "of the wet slag removal device 12.
Is used as a drain section. As will be described in more detail below, the incineration residue 11 loses the first part of the water brought together from the water bath 16 by gravity in this section 27. When the incineration residue 11 passes through all the transport sections 26 including the filter net 32, it reaches the bunker 29 through the cylinder 28 for relay storage.

The filter net 32 has a pipe 36 on its back side 33.
Above the decompression container 38 and through this decompression container
And a suction chamber 30 connected in the form of a vacuum pump. The vacuum vessel 38 is further connected to the water tank 14 of the wet removal device 12 on a pump 42 formed as a tube compression pump. The contaminated water removed from the incineration residue 11 is returned to the water tank 14 of the wet slag removing device 12 by the pump 42. On the decompression device 34, steam 43, i.e. steam, and also hot air, possibly containing exhaust gases from the combustion chamber 19, are also sucked through the incineration residue 11, which likewise results in the incineration residue from which water is to be removed. 11 contributes to maintaining an advantageous temperature of 60 ° C to 95 ° C.

In the example shown in FIG. 2, two suction chambers 30a and 30b of the pressure reducing device 34 installed side by side are formed. The two suction chambers 30a, 30b are represented in plan view, with the suction chamber 30a shown with a filter mesh 32 attached, while the suction chamber 30b is shown without the filter mesh 32. Figure 3
Now, the suction chamber 30a with the attached filter net 32
Is shown in a cross-sectional view along the line III-III shown in FIG. The transport direction A is indicated by an arrow each time.

The suction chambers 30a, 30b are formed like water tanks, and are formed by frame plates 44, 44 ', front walls 46, 46' and floor plates 48, respectively. Side walls of suction chambers 30a and 30b adjacent to each other
Made from a common frame plate 44 '. Suction chamber 30 on frame plates 44, 44 '
a, 30b are fixed by a support structure 45 in the transport section 26. The deepest points 49 of the suction chambers 30a, 30b formed like water tanks each have an exhaust port 50, which is poured into a pipe 52 having a flange pipe 54. By means of a flange tube 54, this tube 52 can be connected to a second tube 53 or a hose 53 ', as indicated by the dashed lines in FIG. This pipe 52, together with the flange pipe 54 and the hose 53 'or the second pipe 53, is connected to the suction chamber 30 and the pressure reducing vessel 38 shown in FIG.
Is formed between them.

As can be clearly seen in FIGS. 2 and 3, the front walls 46, 4
At 6 ′ and at the frame plates 44, 44 ′, a supporting frame edge 56 with a packing 58 is incorporated, on which a filter net is placed.
32 is mounted. Filter net 32
Is provided with a lower hook bar 60 connecting the two frame plates 44, 44 'lying in front of the suction chamber 30 in the transport direction A. With this lower hook bar 60 installed
Cooperates with the lower hook frame edge 61 which stands substantially vertically above the filter net 32 to assume the function of the abutment. Transport direction A
And a fixed flange 62 attached to the two frame plates 44, 44 'below the front wall 46. The fixing flange 62 is provided at the center line axis 6 of the suction chambers 30a and 30b.
It has a fixed opening 64 open to 6. Fixing elements 67, such as screws, nails or bolts,
The connection is made on the front plate 68 and each fixed plate 70. The screws used as fixing elements 67 in the example shown here are the suction chambers 30a, 30b
Can be introduced into the fixed opening 64 from the side of the center line axis 66. These are fixed with nuts 72, and thus filter nets
32 is stretched between the lower hook bar 61 and the fixing flange 62.

In the transport direction A, before the filter net 32, there is a section 27 of the transport section 26. On this section 27, the incineration residue 11
The chain slag remover 21 on the conveying surface 73 is transported upward along the oblique wall 13 "of the wet slag remover 12. The chain 23 of the chain slag remover 21 has a driving body. 76 are fixed, each having a crosspiece 78 extending across the transport section 26. The crosspiece 78 is a wet slag removal device.
Carry the incineration residue 11 each time from the bottom 13 'of the 12 aquarium 14,
Push this forward. Section 27 area and transport section 26
In section 25 ', the arm 78 is located at the lower
With 78 ', only slightly relative to the transport surface 73, e.g. 1 cm
Transported along a transport surface 74 that is only a distance away. Thereby, the water separated from the incineration residue 11 returns to the inside of the water tank 14 of the wet slag removing device 12 through the section 27 of the transport section 26 also represented as a drain section by gravity. Therefore, incineration residue 11 is in this section
Already on 27, some of the water carried along from the tank 14 of the wet slag removal device 12 is lost.

As can be seen from FIG. 3, the filter net 32 is mounted down the side opposite the transport surface 74. Filter net 32
The distance to the lower corner 78 'of the sword 78 moving up is from 2 cm to 10
cm, preferably 4 cm to 7 cm. This spacing forms a permanent slag bed 80 on the filter net 32, on which the driver 76 of the chain slag removal device 21 can carry further incineration residues 11 with its arms 78. The uppermost slag membrane of the slag bed 80 is then transported off in each case and can be newly formed by newly transported incineration residues. The slag bed 80 on the filter screen 32 facilitates the maintenance of the reduced pressure acting on the filter screen 32 from the suction chambers 30a, 30b and also acts as an additional filter.

The filter net 32 has a 5 mm radius opening 82 mounted in this example in a grid, which is
Spreads conically over. The lattice spacing 83 between the centers of the substantially circular openings 82 ranges from 10 mm to 40 mm, preferably 25 mm.

The first front wall 46 ′ of the suction chamber 30, seen in the transport direction A, is provided with two nozzles 84 facing the filter network 32, whereby the filter network 32 is displaced by pressurized water 85 and / or compressed air. Can be washed at 85 '. The nozzle 84 can be operated using compressed air 85 'or pressurized water 85. However, it is also possible to equip a different nozzle 84, some with compressed air
Another can be provided for 85 ', and another for pressurized water 85. The nozzle 84 is movable and adjustable or fixed.
It is also conceivable to mount such a nozzle 84 in another front wall 46 or frame plates 44, 44 'or floor plate 48. Compressed air 85 ′ can also be extruded toward filter mesh 32 through outlet 50 in floor plate 48 of suction chamber 30. However, for this purpose, the pipe 36 is provided with a valve 86 as shown in FIG.
It is necessary to connect with the compressed air inflow 88 above. Further valves
This line 36 on 86 'or on two-way valves 86, 86' must be able to be disconnected from the vacuum pump and the vacuum vessel. As a correspondingly large stream of compressed air 85 'impinges on the filter net, the slag bed 80 is loosened and its filtration function is thereby better. The pressurized water 85 also cleans the pipe 36 as well as the back 33 of the filter net 32. In one washing cycle, it is conceivable, for example, to wash with pressurized water 85 every 10 minutes and with compressed air 85 'every 60 minutes, with compressed air 85' and pressurized water 85 flowing each time for about 10 seconds. The vacuum is reduced during this short time.

By installing several filter screens 32 one behind the other and / or side by side in a transport section 26, the cleaning of the screens can be carried out continuously, so that all the screens have a reduced vacuum at the same time. But never.

In the embodiment shown, two filter networks 32
Are lined up with the two suction chambers 30 and a part 2 of the transport section 26
Provided as 5 '. But two filter nets 32
It is also conceivable that it is surrounded by one common suction chamber 30 on its back side. However, depending on the width and the stability requirements of each transport section 26, only one or more filter networks 32 can be provided with it and the suction chamber 30. If necessary, several filter nets 32 and suction chambers 30 can also be mounted one after the other in the transport direction A, as described above. The suction chamber 30 may be formed as a funnel instead of as a water tank. A part 25 ′ of the transport section 26 formed by the filter network 32 is
It is not always necessary to place it in 5. Also opening 82
Does not necessarily have to extend conically across the back 33 of the filter net 32.

If, for example, a plate-type slag remover is provided instead of the chain-type slag remover 21, the filter net 32 will thus have a transport surface 74 defined by the transport surface 73 of the plate-like slag remover. It is attached down on the opposite side.
In such a case, in order to ensure transport of the incineration residue 11 on the filter net 32, it can be formed as a vibrating bed, for example, which can also be mounted inclined in the transport direction A upward.

The reduction of the water content by the inventive method and the inventive device 10 can be achieved by the cold or hot incineration residue 11.
But it can be implemented. This saves on insulation costs, but reduces efficiency due to changes in the combustion process.

[Brief description of the drawings]

FIG. 1 is a schematic view of an apparatus having a wet slag removing apparatus and a pressure reducing apparatus for removing moisture from incineration residues.

FIG. 2 is a plan view of two suction chambers of a decompression device, shown with one suction chamber without a filter net, and another with a filter net installed.

FIG. 3 is a cross-sectional view of the suction chamber with the filter net fully installed, taken along line III-III of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Incineration residue 12 Wet slag removal device 14 Water tank 19 Combustion chamber 20 Mechanical conveyance medium 30 Suction chamber 32 Filter net 33 Back side 34 Decompression device 40 Decompression source 42 Pump 43 Steam 50 Discharge port 80 Slag floor 84 Nozzle 85 Pressurized water

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Martin Brunner Switzerland 8049 Zurich Linmatta Rüstrasse 72 (72) Inventor Ruedi Fry Switzerland 8307 Effretikon Rietstraße 22

Claims (16)

[Claims] 1. A wet slag removing device together with an incineration residue (11)
The water conveyed from (12) is removed using a decompression device (34), from the combustion chamber (19) to the water tank (14) of the wet slag removal device (12), from which the machine Medium (2
Method for reducing the water content of the incineration residue (11) carried by 0). 2. The incineration residue (11) is conveyed onto a filter screen (32) of a pressure reducing device (34), where the back side (3) of the filter screen (32).
Due to the reduced pressure close to 3), water is removed through a filter network (32), this reduced pressure preferably being from 0.1 bar.
0.9 bar and this water is preferably filtered
Method according to claim 1, characterized in that it is collected in a suction chamber (30) mounted on the back side (33) of (32). 3. Incineration residue carried on a filter net (32)
Method according to claim 2, characterized in that part of (11) remains on the filter screen (32), where it forms a slag bed (80). 4. When the incineration residue (11) reaches the filter net (32) for water removal, it is from 60 ° C. to 95 ° C., preferably 70 ° C.
Method according to any of claims 2 to 3, characterized in that it is conveyed from the combustion chamber (19) to and out of the wet slag removal device (12) so as to show a temperature of from -80 ° C. 5. The heat loss of the incineration residue (11) coming from the combustion chamber (19) is reduced by the wet slag removing device in the wet slag removing device (12).
Insulation of the walls (13, 13 ', 13 ") of (12), and the insulated floating body (17) in the water tank (14) of the wet slag removing device (12) and the incineration residue (11)
Method according to claim 4, characterized in that it is minimized by adding it to a water bath (16) that accepts. 6. The incineration residue (11) of a combustion process carried out without this treatment at the end of the combustion process, especially by preheating and / or suppressing the primary air (1),
Wet slag remover from combustion chamber (19) at higher temperature (12)
The method according to claim 4, wherein the method comprises: 7. Steam from a combustion chamber using a pressure reducing device (34)
Method according to any of claims 2 to 6, characterized in that the (43) and / or hot air is sucked through the incineration residue (11). 8. The filter screen (32) of the pressure reducing device (34) is periodically cleaned with compressed air (85 ′) and / or pressurized water (85), the cleaning being particularly performed on the back side of the filter screen (32). (33)
The method according to claim 2, wherein the method is performed from: 9. The slag removing device according to claim 1, wherein the water removed from the incineration residue is again drawn into the wet slag removing device through a pump. the method of. 10. A part of the transfer section (26) (25 ') is provided with a decompression device.
A filter net formed by the filter net (32) of (34);
The wet slag removing device (12) having a water tank (14) including a water bath (16), characterized in that the (32) is connected to a vacuum source (40) on the back side (33), ) And mechanical transport media (2
In this case, the transport medium (20) transfers the incineration residue (11) along the transport section (26) to the water tank (14) of the wet slag removing device (12).
A device for reducing the water content of the incineration residue (11) which is carried out from the combustion chamber (19) and reaches the wet removal device (12). 11. The filter network (32) comprises a mechanical carrier medium.
Characterized in that it is shifted backwards, preferably by up to 10 cm, on the opposite side of the transport surface (74) determined by (20).
Device according to 10. 12. The filter screen (32) according to claim 10, wherein the filter screen (32) has an opening (82) of a diameter of up to 10 mm, preferably 5 mm, extending conically on the back side (33).
The described device. 13. A filter screen (32) having, on its back side (33), a suction chamber (30) formed as a water bath or funnel (44, 44 ', 46, 46', 48) and its deepest Outlet near point (49)
(50), through which the suction chamber (30) is connected to the water tank (14) of the wet slag removal device (12) by a pump (42), characterized in that it is characterized in that apparatus. 14. Device according to claim 13, characterized in that the filter net (32) can be impinged on the compressed air (85 ') through the outlet (50). 15. There is a nozzle (84) directed to the back side (33) of the filter network (32), with which the filter network (32) is used.
The back side (33) from the pressurized water (85) and / or compressed air (85 ')
15. The apparatus according to claim 10, wherein the apparatus can be washed with a device. 16. The water tank (14) of the wet slag removing device (12) has a wall (13, 13 ', 13 ") having heat insulation (15). A water bath (16) inside is covered with an adiabatic floating body (17), wherein the floating body is prevented from reaching the transport section (26) area by an obstruction (31),
Apparatus according to one of claims 10 to 15.