JPS59221515A - Dust feeding device - Google Patents

Abstract

PURPOSE:To prevent an encroachment of item and enable a discharging of gas through clearances in the item in the conveyor by a method wherein a slight clearance is made between the upper part of the moving wall of the dust feeding device and the conveyor case and some discharging holes are arranged at the position spaced apart from the screw by the moving wall of the conveyor casing. CONSTITUTION:A part of the wall of the conveyor case 27 adjacent to the screw 28 is a moving wall 50 which is guided by the guide part 49 to be movable in a direction perpendicular to the axis of the screw 28. Since the moving wall 50 is connected to a projected piece 51 projected into the conveyor case 27 in the moving bearings 38 and 39 along an axis of the screw 28 over an entire length of the conveyor case 27, it may be moved as the screw 28 is moved. An expansion force produced by dust 46 held in the screws 28 and 29 is detected as a hydraulic force for the cylinders 35 and 36 and is adjusted by a hydraulic circuit. Since a clearance D is arranged at the upper end of the moving wall 50 and a discharging box 55 with discharging hole 53 and inspection hole 54 is arranged at a part of the conveyor case 27 spaced from the screws 28 and 29 by the moving wall 50, a processing of gas can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a feeding device for transporting and charging waste to an incinerator in an urban waste incineration facility mainly consisting of loose materials such as industrial waste.

Some of the inventors have already invented a transportation device and patented m5.
r-iza No. 1990) is currently under application. This consists of two rotatably held parallel to each other in a conveyor case.
In the transport device equipped with a book screw, a part of the conveyor case beside the screw serves as a moving wall that moves in a direction perpendicular to the axis of the screw, and at least one of the two screws is a moving screw that moves in a direction perpendicular to the axis of the screw;
A transportation device in which the movable wall moves together with the movable screw was invented by some of the present inventors (Japanese Patent Application Sho Sr-
If applied to the feeding device for which we are currently applying (as No. Waste, mainly solids, is received from the entrance, large items are roughly crushed, and if there are solids stored in bags, they are broken, and a fixed amount is transferred, and the structure is simple. It is possible to provide a feeding device for a waste incinerator.

Moreover, since a part of the conveyor case beside the screw moves in a direction perpendicular to the screw axis, no jamming occurs in the gap between the screw blade and the conveyor case when the screw moves.

Figure 1 shows an example of a municipal waste incineration facility.

The garbage stored in the pit 1 is dumped into the hola pub using a packet 3 of a crane truck, and is supplied to the incineration del by a feeding device 5 serving as a transportation device. In the incineration del, fluidizing air supplied by a forced air blower 7 is ejected upward into the furnace from a distribution plate g, hits an inclined wall 9, and becomes a swirling flow io in a vertical plane, which cures fluidized media such as sand. A two-layer swirling fluidized bed is formed. This swirling fluidized bed enables good combustion of waste in a short period of time without hindering fluidization, and high combustion efficiency can be obtained even without prior fine crushing.

//, //' are combustion exhaust gas ducts, 12 is a noncombustible material discharge device, 13 is a vibrating sieve, lt is a conveyor for discharging lumpy noncombustible materials, and 15 is an elevator for collecting a fluid medium such as sand.

In the feeding device S, /4 is the inlet for garbage, 1 is the outlet for garbage after the bag has been torn, lt is the outlet for large unsuitable materials that are not allowed to be put into the incinerator, and /9 is the return chute. .

The combustion exhaust gas discharged from the incinerator 6 is induced by the induced blower θ, and the temperature is controlled in the gas cooling chamber 21 so that the temperature at the electrostatic precipitator is around 300°C, and the air is used to raise the temperature of the fluidizing air. After some heat is recovered by preheater 2J, -
Most of the dust is removed by the electric precipitator, and the damper 2
．． It is discharged to the atmosphere through the chimney through 6 and 2 through the chimney. Note that the fluidizing air source is often used by sucking air from the pit chamber 2s to prevent odor.

In this way, waste incinerators generally adopt a balanced ventilation system using a forced draft fan and an induced draft fan 20, and control the draft system so that the induced draft draft 20 maintains a negative pressure inside the incinerator. It is true.

In the example shown in Fig. 1, the control is performed by an induced fan and a control damper with a capacity of 20. Also, between the inside of the incinerator 6 and the pit chamber 2S, there is a hora pub and water supply system, although it is incomplete! sealed by the contents of the

However, when incinerating waste is input into the incinerator 6, fluctuations in composition and amount cannot be avoided, so the generation of combustion exhaust gas is not necessarily constant, and the ventilation system cannot be controlled with perfect followability. The internal pressure of the furnace 6 fluctuates.

Therefore, conventional incinerator 6
It was necessary to create a large negative pressure inside the pit chamber λ3.
The amount of leakage from the air supply device 5 through the incinerator 6 may also increase depending on the negative pressure inside the incinerator 6, which requires an induced fan 20 with a large air volume and pressure and its driving motor, and the proportion of its power consumption that is included in the operating cost is I couldn't ignore it.

The present invention provides a dust incinerator that allows the negative pressure inside the furnace to rise due to the air that enters through the dust supply system, reduces the size of the induced fan that generates the negative pressure inside the furnace, and provides a dust supply system that can save the operating energy of the fan. The purpose is to provide.

The present invention provides a mechanism for exhausting air from the part of the water supply system S that comes into contact with waste, and even if the inside of the incinerator 6 has a slightly positive pressure and the combustion exhaust gas flows backward through the water supply system, the combustion exhaust gas can be exhausted from the part of the water supply system S that is in contact with the waste. Based on the technical concept of preventing the inflow of combustion exhaust gas into the pit chamber 25 by exhausting the air from the pit chamber 25, and making it possible to operate at a small negative pressure inside the furnace, there is a slight gap between the upper part of the movable wall of the feeder and the conveyor case. By providing a gap between the conveyor casing and the moving wall to prevent galling or jamming between the conveyor casing and the moving wall during movement, an exhaust hole is provided in the part of the conveyor casing that is separated from the screw by the moving wall to exhaust air. Gas, etc., is exhausted from the gap between the contents inside the conveyor through the gap at the top of the moving wall.

Embodiments of the present invention will be described below with reference to the drawings.

Figures 2 and 3 show the overall structure of the feeding device. The conveyor case is connected to a hola pub via a waste inlet 16, with a waste outlet at one end at the bottom and an outlet/outlet for bulky unsuitable materials that are not allowed to be thrown into the incineration del at the other end. g is provided. Inside the conveyor case, the conveyor case rotates in opposite directions, and during normal operation, rotates in the normal direction so that the upper sides approach each other.The axes of the conveyor cases are held parallel to each other on a horizontal plane, and they are twisted in opposite directions. A screw 21° 29 of the same direction is provided. The pitch of the blades 30, 3/ of the screws 2g, 29 is larger near the outlet 16 than the pitch near the inlet 16.

One screw 29 is mounted on a bearing 32 in a fixed position relative to the conveyor case 2. ．． 33, motor 3'
The shaft coupling 3 is directly rotated by the shaft coupling 1 through the shaft coupling 1.

During normal operation, the screw 29 rotates in a normal counterclockwise direction when viewed from the side of the motor 3, and the screw head rotates in a normal clockwise direction.

As shown in FIGS. 3 and 9, the screw 2g is supported in the cylinder 3 by movable bearings 3g and 39 that move along a guide rail 37 through a 34. Since the cylinders 31.3& are arranged to be synchronously displaced by equal distances as described below, the screw sr moves parallel to the screw 29 and the center distance adjustment is from 11 to 1. It is now being carried out until now.

As shown in FIG. 7, a part of the wall of the conveyor case 27 beside the screw 2ff serves as a moving wall 50 that is guided by a guide portion II9 so as to be movable in a direction perpendicular to the axis of the screw λg. . The moving wall SO extends along the entire length of the conveyor case core along the axial direction of the screw 2g, and as shown in FIG.
Since it is connected to the protruding piece protruding into the conveyor case body (long !r in Fig. 9, protruding through 2) l, it moves with the movement of the screw 2g. The elongated hole S2 is always closed by the moving bearing 7g, 39.

As shown in FIGS. 5 and 6, the shaft end of the screw 2g, the motor 29, and the II side are pivotally connected to the shaft of the screw 29, and the link aO is pivotally connected to the shaft of the screw 2g. Links F/ and gears t1.2. fixed to the shafts of screws 2g, :19, respectively. '73, link 17
0. 'I/ end is pivoted by a common shaft l/, IIa, gear '12 and link II/ are pivoted by a shaft pya, gear tIs meshes with gear 3, gear 4t etc. , Even when the center distance is changing from 1□ to 12, the screw: l, ? , 29, links eo and ai rotate, and link '10. '
Since I/ is pivotally connected by shaft 1ltIa, gear '1
3. 'l! ;.

The gear train of gear 1 is kept in mesh, and the gear train of screw 2 is
On the other hand, the screw 2g is continuously driven and rotated in the opposite direction.

As shown in Fig. 7(a), the dust 'IA' is the screw J f.

When screws 2q and 29 are caught between them, the screws 2g and 29 exert an expanding force that increases the distance between their axes.

If this expansion force is large, use a 2g screw.

This must be prevented as it may cause damage to the body and other parts.

In order to meet this requirement, the distance between the axes is adjusted as shown in FIG. 7(a) (1)). That is, the distance between the axes is set to a minimum inter-axle distance 1□ and a maximum inter-axle distance J, 2 using a limit switch (not shown).

At this time, the clearance between the screw shafts is 5IyS2 (
For example, S1=/2! rrans S2=J, about the size of 2 sardines). S2 is a dimension that allows the largest foreign object to be transported to pass through.

The expanding force generated by the screws 21 and 29 is caused by the cylinder JAr, 31. Detected as oil pressure. For example, as will be described later, an allowable enlarging force is set as an allowable value of the enlarging force in a hydraulic circuit.

However, during normal operation, the distance between the axes is the minimum as shown in Figure 7 (a)! , crush and break the bag. When a large piece of garbage 6 or a lump of incombustible material enters and the enlarging force exceeds the allowable enlarging force, the distance between the axes (referred to as L) opens until it falls to the allowable enlarging force in the range of 1□;≧J≧stone. The screw 2g, :19 continues to rotate in the forward direction both when it is opening and after it has opened.
Shredding, bag tearing and transport are carried out successively.

Furthermore, larger foreign objects etc. may come in and reduce the center distance 1 to 1-
If the enlarging force exceeds the allowable enlarging force even with #2, the screws 2g, 29 are reversely rotated to send the foreign matter back and discharge it from the discharge lower g. However, it is desirable to discover and discharge such foreign matter at the time it is put into the hora pub to prevent contamination of the surrounding area.

FIG. 8 shows an example of a hydraulic circuit for adjusting the distance between the shafts as described above.

To explain the operation, first start the hydraulic pump Hiro 7,
Turn on 5OLa and move both cylinders 36°35 forward. Center distance 1-4. When this happens, a stopper or limit switch (not shown) stops the operation and all solenoids are turned off. Thereafter, the motor 3 is started and the screw 2g is rotated to perform crushing, bag tearing, and transfer. During normal operation, the cylinders 36 and 3 are hydraulically locked to maintain the distance between the shafts), =J,.

For example, when small foreign objects that can enter the incineration kettle, such as irons, short pipes, hammers, cannonballs, small automobile parts, tire fragments, and square timber fragments, are caught, an excessive expansion force is generated and the cylinder 36. Generates high pressure at 31. Safety valve lIg is, for example, 70~/170Kgf 7c
m", and is set to a predetermined allowable expansion force (for example, ATON by bearing reaction force) by adjusting the pressure.

When the expansion force exceeds the allowable expansion force, the safety valve Qg opens and the cylinder 34, p J ! ; is retreated by an equal distance, and the distance between the shafts increases until the expansion force decreases to the allowable expansion force and the oil pressure becomes less than the set pressure of the safety valve pg, and expansion stops when it reaches this value. After that, the operation continues for several minutes, and after the foreign object has been transported, J-=
1. Return to normal operation.

If a foreign object of a size that is not allowed to enter the incinerator, such as a gas cylinder, motor, or manhole cover, enters, the distance between the shafts will increase as described above, but!
If it is still not below the allowable magnifying force plate even when the magnifying force becomes equal to 12, the motor 3 is temporarily stopped and reverse rotation is started. After continuing this state for several minutes and discharging the foreign matter from the discharge port, screws 2g and 29 are rotated in the normal direction, and the SOI'
Turn on al and cylinder 3! ;, 31. Move forward, return to J-=J-, and perform normal operation.

SOL E is for both cylinder retraction circuits.

Cylinder 34. ．． 3! ;, Oil leakage from other parts ζ, screw 2g,! When the parallelism of 9 can no longer be maintained,
5OLa2 or SQL b, is turned ON, and cylinders 3A, 3! Correct by performing relative movement between r.

Cylinder 36,3! A synchronized cylinder may be used for simultaneous operation.

In addition to garbage, it can be applied to anything that is mostly solid and contains at least a portion of the solids contained in a bag, and can be used as a bag-breaking/feeding device. can.

Furthermore, it can be used as a rough crushing and feeding device even in the case of loose solids that do not contain bags.

In the embodiment described above, by moving the movable wall SO, it is possible to prevent objects to be handled from entering the gap between the screw; Ag and the conveyor case 27, and to ensure smooth movement and operation of the screw sg.

The movement of the screw λg and the movement of the moving wall SO may be connected by another mechanism and may be performed together, or may be driven by separate drive mechanisms so as to move together. Further, both screws 2J and 9 may be movable.

The exhaust mechanism consists of a gap provided at the upper end of the moving wall 50 in FIG. Exhaust box with hole sti! ! It consists of r,
A nozzle s'y connected to the combustion exhaust gas duct l/ is provided on the ceiling surface of the exhaust box 5S via a filter 56.

However, this point may be connected to other than the exhaust gas duct ll as described later. Filter 36 is an inspection hole! It has a structure that allows you to easily pull it out and clean it by opening the bag.

Here, the range of the gap does not need to be uniform over the entire length of the moving wall S0, but it is effective if the area in contact with the waste exhibiting a sealing effect is particularly widened. It is desirable to reach the entrance, but the guide part and the movable wall 5
It is effective even with just a play to prevent galling with zero.

The filter 36 may be omitted if there is no problem with the exhaust line due to the conveyance of the fuel supply device S that may be sucked in through the gap; in that case, the filter 36 may be omitted.
is also unnecessary.

The conveyance of the feeding device S near the gap is carried by the screw 2.
g and the transfer force along the rotational direction of the blade 30 are applied,
Because it is taken out from the gap, it is less likely to get clogged, and even if it does get clogged, it will be naturally removed by being wiped away by other conveyed items.

The position of the exhaust hole 53 is such that there is a space along the entire length of the movable wall 50 for the movement of the screw 2g in the guide section for the movable wall, and this serves as a kind of duct, so there are no restrictions on the position. few.

The discharge port /g of unsuitable materials of the dust supply device 5 can be opened and closed as shown in Fig. 2, except when the discharge operation is performed by reversing the screw, so as not to unnecessarily suck outside air from here and weaken the exhaust effect from the exhaust hole S3. It is desirable to keep the lid sg closed to maintain airtightness.

Here, the combustion exhaust gas that flows back when the inside of the furnace becomes positive pressure is transferred to the bit chamber 2! In order to prevent the contents from leaking into the air, make sure to thoroughly connect the exhaust vents from the gaps between the contents inside the hollow pub or the water supply system S.
It is necessary to aspirate the inside of the hopper, and it is desirable that the distance between the surface of the contents in the hopper and the feeder 5 be at least a certain level. The contents in them, especially the feeding equipment! Since the work is carried out by the compressed contents swallowed between the screws 2g and 29, it is desirable to perform the work on the pit chamber J& side rather than the screw part 29. It can be said that exhausting the air is preferable.

The gas exhausted from the connection nozzle S7 of the feeder should be blown into the incinerator 6 as combustion air after passing through a filter if necessary, from the viewpoint of odor control and treatment of mixed combustion exhaust gas. convenient. Therefore, the connection nozzle 57 can be connected to the intake line of the forced air blower, but since this exhaust may contain mist components from the contents and combustion exhaust gas, an independent line with an independent air blower that can be cleaned separately is required. As a result, it is desirable to blow secondary air into the freeboard part of the incinerator or into the burner nozzle.

In this manner, the present invention suctions the gas in the gap between the contents of the feeder 5 along with the screw 2Ir.

Therefore, even if the pressure inside the furnace becomes slightly positive and the combustion exhaust gas inside the furnace flows backward through the gap between the feeder 5 or the contents inside the hopper, it will not be effective after passing through a part of the screw with a large passing pressure loss. Therefore, the backflow gas is exhausted from the water supply device and does not reach the left side of the pit chamber 2. Therefore, according to the present invention, it is possible to operate the furnace at a small negative pressure, reducing the air volume and wind pressure of the induced fan 20, and further reducing the capacity of the drive motor of the induced fan 20 and reducing power consumption. This made it possible to reduce equipment operating costs.

Furthermore, according to the present invention, even if a hole is provided in the hopper for measurement etc., the pressure inside the hopper is reliably maintained at negative pressure, so leakage of gas etc. from the hopper is reliably suppressed, and the measuring device is It also has the effect of preventing stains and bad odors.

FIG. 1 is a longitudinal cross-sectional view of a garbage incinerator, FIG. 1 is a drawing of an embodiment of the water supply device of the present invention, and is an A-AvFT side view of FIG. 3, and FIG. 3 is a plan view of FIG. 2. , Figure 7 is a left side view of Figure 2, Figures 5 and 6 are a partial right side view of Figure 2, and Figure 7 is a partial right side view of Figure 2, respectively.
Figures (a) and 7(b) are sectional views taken along line BB in Figure 2, and Figure 7 (b).
The figure is a control circuit diagram showing an embodiment for operating the feeding device of the present invention.

/...Pit Co..Crane 3.-Packet Da.
・Hoppa! ... Water supply device 6.. Incinerator 7.. Forced blower g.. Dispersion board... Inclined wall IO.. Swirling flow //, //'... Combustion exhaust gas duct /, 2.. Incombustible material discharge device 13.-[1 sieve / goo conveyor /3
・Elevator 16・・Garbage inlet / ・・Garbage outlet 7g・・Discharge port 19・・Return shoe) 20
・・Induced blower ・Gas cooling room 2. 2.・Electrostatic precipitator 3.・Air preheater 2.・Chimney 2! ... Pit room 26 ... Dunno e 2ri ... Conveyor case
, 2f・-Screw 29・Koma screw Jθ, 3
/-・Blade 32.3.3・-bearing 31III+1 motor 3g 1・・shaft joint 3! , 3b...Cylinder 3ri...Guide rail 3g, 39--Moving bearing GQ, Hiro/-War link Hiro J, 11.7. Gugu, 1Ij-・Gear Gu6 Life・Garbage q7...Hydraulic pump at...Safety valve 'It...Guide part 50...Moving wall 51...Protruding piece! 2...Slot hole S3...Exhaust hole slI...Inspection hole
S5...exhaust box 56...filter! ri...Connection nozzle sg...Lid.

Patent applicant: Ebara Corporation Agent Shin Ibe Figure 5 44 years Figure 7

Claims (1)

[Claims] l Two screws are rotatably held horizontally and parallel to each other in a conveyor case, and at least a portion of the conveyor case beside the screws on one side of the screw A waste container that has a movable wall that moves in a direction perpendicular to the axis, has an exhaust hole in the space inside the conveyor case that is separated from the screw by the movable wall, and has a waste storage hopper above the screw. Feeding device for vehicle incinerator.