KR100771121B1 - Sludge drying apparatus - Google Patents

Abstract

An apparatus for drying sludge is provided to prevent odor from being generated through a simple structure even while an installation area is increased, by supplying waste heat, which is outputted from an incinerator, to a drier. An apparatus for drying sludge comprises an incinerator(10) and a drier(30). A waste heat outlet pipe(22) of the incinerator is connected to the drier. An exhaust gas pipe(41) is connected to an exit of the drier. A bypass pipe(51) is connected between the waste heat outlet pipe and the exhaust gas pipe, thereby forming a reheating part(55) at the rear of a connection region of the exhaust gas pipe, which is connected to the bypass pipe. A first damper(52) is installed at the bypass pipe, and a second damper(53) is installed at the rear of the connection region of the exhaust gas pipe. A temperature controller(54) is installed at the exhaust gas pipe. The first and second dampers are opened or closed in opposite directions according to an output signal of the temperature controller.

Description

Sludge Dryer {SLUDGE DRYING APPARATUS}

1 is a longitudinal sectional view of an embodiment of the present invention;

      <Explanation of symbols for main parts of the drawings>

10: incinerator 22: waste heat discharge pipe

30: dryer 41: exhaust gas conduit

51: bypass conduit 52,53: first and second dampers

54: automatic temperature controller 55: reheating unit

The present invention relates to a sludge drying apparatus, and more particularly, to an apparatus for drying sludge having a high water content using waste heat generated in a waste incinerator.

As is well known, household wastes and industrial wastes are mainly treated by landfill and incineration methods. The above methods have advantages and disadvantages, respectively, but landfill methods secure landfills, generate leachate and odor, and leave them for a long time after landfilling. It is a tendency to prefer incineration method due to the development delay or aesthetic defect caused by, and waste heat is generated when incineration of household waste and industrial waste (hereinafter referred to as "waste") as described above. We are making a lot of efforts to use it.

In addition, sludge (hereinafter referred to as "sludge") generated from food waste, sewage treatment plant, wastewater treatment plant, manure treatment plant or paper mill must be transported to a third place for recycling or landfilling. In order to reduce the transportation cost because it is more than 95% by weight, the water content is usually reduced to about 80% by weight by installing a filtration (concentration) device at the place of origin, and then the water content in a drying facility installed at the place of origin or at a third place. Recycled or landfilled by reducing the weight percentage.

On the other hand, if the waste heat generated in the incinerator is used as a heat source for drying the sludge, the waste heat generated in the incinerator can be efficiently used, and since it does not use a separate energy in the drying facility, it will significantly contribute to energy saving.

A complex waste incineration and drying system for meeting the above requirements is disclosed in Utility Model Registration No. 189361. The complex waste drying system is equipped with a reburn chamber at a waste heat outlet of an incinerator and a reburn burner in the reburn chamber. To install the installation, the drying drum driven by the chain at the outlet of the reburn chamber, the stirring pin is installed on the inner wall and the impeller (blade) is installed inside, and the cyclone dust collector is installed at the outlet of the drying drum.

The complex waste incineration and drying system injects waste heat generated by injecting waste into the combustion chamber of the incinerator into the reburn chamber. When the waste heat is introduced into the reburn chamber as described above, the combustion atmosphere of the reburn chamber is changed at the initial stage of incineration. In order to maintain the high temperature, fuel is supplied to the reburn burner to reburn unburned gas in the waste heat.

In addition, the waste heat through the reburn chamber is supplied to the drying drum, and the sludge is dried by rotating the drying drum while grinding the sludge in the crusher installation hopper installed at the inlet of the drying drum.

However, the above complex waste and drying system has the advantage of efficiently utilizing the waste heat generated in the incinerator, but a serious odor occurs in the exhaust gas exhausted from the drying facility, causing secondary pollution. That is, the sludge that is added to the drying drum is often decayed (fermented), and the fermented sludge and unfermented sludge are fermented by waste heat while being agitated and dried, and thus odors cannot be avoided. In addition, even if a cyclone dust collector is installed at an outlet of the dry drum, the cyclone dust collector is only capable of separating solids and gases, thereby making it impossible to remove odor generated in the dry drum.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sludge drying apparatus capable of correcting the above problems and satisfactorily preventing the occurrence of odor with a simple configuration.

In order to achieve the above object, the present invention comprises an incinerator and a dryer, in which the waste heat discharge pipe of the incinerator is connected to the dryer and the exhaust gas conduit connected to the outlet of the dryer to dry the sludge by waste heat in the apparatus And connecting a bypass conduit between the waste heat exhaust pipe and the exhaust gas conduit to form a rear portion of a bypass conduit connection point of the exhaust gas conduit as a reheater, and a connection point of the bypass conduit and the bypass conduit of the waste heat exhaust pipe. The first and second dampers are installed at the rear, respectively, and the thermostat is installed in the exhaust gas conduit so that the first and second dampers are opened and closed in opposite directions, respectively, by the output signal of the thermostat. .

1 to 3, an incinerator 10 and a dryer 30 are provided, and the incinerator 10 includes a hopper having a damper 13 disposed in front of the furnace body 11. 12), the incineration product conveying cylinder 14 is installed in the lower portion of the hopper 12, and a fixed fire grate 15 and a movable grate 16 are installed. The upper part of the grate 15 and 16 is formed as a primary combustion chamber C1, and communicates with the primary combustion chamber C1 at the central portion of the furnace body 11 and induces flames vertically from the ceiling of the furnace body 11. The secondary combustion chamber C2 having the member 17 is formed, and the waste heat outlet 18 is formed at the rear of the furnace body 11, and the auxiliary burner 19 is provided at the front of the furnace body 11. The ignition burner 20 and the see-through window 21 are installed below the center.

The dryer 30 supports the drying drum 31 with rollers 32a and 32b to rotate the chain driving means 33. The stirring wall 34 is installed on the inner wall of the drying drum 31. The rotating shaft 36 supported by the support (35a) (35b) is installed to install a plurality of stirring blades 37 on the rotating shaft 36 to drive the rotation by the chain drive means 38, and the drying drum ( 31 is supported at both ends by the support members 39a and 39b installed on the support posts 35a and 35b, and the sludge crushing and transfer hopper 40 is provided on the one side (inlet side) support member 39a. It is installed, by connecting the waste heat discharge pipe 22 connected to the waste heat outlet 18 of the incinerator 10 to the drying drum 31, and supplies the waste heat generated in the incinerator 10 to the dryer 30, The sludge stored in the sludge crushing and conveying hopper 40 is dropped into the drying drum 31 to dry the sludge by waste heat, Ex gas will be by way of the dust collector 42 is installed at the outlet of the dryer 30 is discharged to the exhaust gas conduit 41.

The incinerator 10 and the dryer 30 are similar to the technical means described in the prior art, and the incinerator 10 and the dryer 30 itself are not technical features of the present invention. 10) and the dryer 30 can be used other well-known in addition to the above is a matter of course.

And the present invention is connected to the bypass conduit 51 between the waste heat exhaust pipe 22 and the exhaust gas conduit 41 to reheat the rear portion of the bypass conduit 51 connection point of the exhaust gas conduit 41 ( 55 and first and second dampers 52 and 53 are installed at the rear of the bypass conduit 51 and the connection point of the bypass conduit 51 of the waste heat exhaust pipe 22, respectively. The thermostat 54 is installed in the gas conduit 41 so that the first and second dampers 52 and 53 are opened and closed in opposite directions, respectively, by the output signal of the thermostat 54. .

The exhaust gas conduit 41 behind the reheater 55 is discharged to the atmosphere after passing through a temperature reduction facility (not shown). The temperature reduction facility is a waste heat hot water boiler or a cooling tower. In addition, a cyclone dust collector 42 is installed at the outlet side of the dryer 30 of the exhaust gas conduit 41 to separate solids, and a temperature sensor 23 is installed at the waste heat discharge pipe 22 to provide the auxiliary signal. By operating the burner 19, a complete combustion of the incinerated object is achieved.

The present invention as described above typically forms the capacity of the incinerator 10 to about twice the capacity of the dryer 30, the connection point of the bypass conduit 51 of the bypass conduit 51 and waste heat discharge pipe 22 The rear cross-sectional area is formed to be about 55:45, the temperature automatic regulator 54 installed in the exhaust gas conduit 41 is set to operate at about 250 ℃.

Therefore, when the incineration material is dropped into the primary combustion chamber C1 of the incinerator 10 and burned, the combustion heat generated during combustion is supplied to the drying drum 31 via the waste heat discharge pipe 22 and the sludge crushing and transporting hopper ( When the sludge stored in 40 is rotated into the drying drum 31 and the drying drum 31 and the rotating shaft 36 are rotated, the sludge is dried by the waste heat and discharged to the outlet formed in the support member 39b. Since the combustion temperature of the incinerator 10 is low and the dryer 30 is also cooled in the initial operation of the operation 30, the temperature of the exhaust gas exhausted to the exhaust gas conduit 41 is lower than the set temperature of the temperature automatic regulator 54. Since the second damper 53 is fully opened and the first damper 52 is completely closed, the waste heat discharged to the waste heat discharge pipe 22 is supplied to the dryer 30 and the bypass conduit 51. Is not supplied.

The exhaust gas exhausted to the exhaust gas conduit 41 performs a sludge drying function, and the temperature is lowered, and the bypass conduit 51 is also closed, so that the temperature below the set temperature of the automatic thermostat 54 is maintained. As it is discharged to the temperature-saving facility, it is discharged with some odor included.

When the initial operation is completed and the normal operation (ideal operation) is reached, the temperature of the exhaust gas exhausted to the exhaust gas conduit 41 becomes higher than the set temperature, and the second damper 53 is proportional to the set temperature increased. Closed and the first damper 52 is opened, the waste heat of the high temperature (about 900 ℃) discharged from the waste heat discharge pipe 22 to the bypass conduit 51 is supplied to the reheating portion 55 of the exhaust gas conduit 41 By heating the exhaust gas flowing through the exhaust gas conduit 41, the odor contained in the exhaust gas is decomposed and extinguished, and when the exhaust gas exhausted from the dryer 30 contains unburned gas Co, it is completely combusted. .

In addition, by controlling the amount of heat supplied to the drying drum 31 by controlling the opening and closing of the first and second dampers 52, 53 installed in the bypass conduit 51 and the waste heat discharge pipe 22 to the type of sludge to be dried. Irrespective of a particular thing, favorable drying is possible.

As described above, the present invention forms a reheat unit behind the bypass conduit connection point of the exhaust gas conduit by connecting the bypass conduit to the waste heat discharge pipe supplying waste heat to the dryer in the incinerator and the exhaust gas conduit connected to the outlet of the dryer. High temperature is applied to the low temperature exhaust gas flowing through the exhaust gas conduit according to the set temperature of the thermostat installed in the exhaust gas conduit by installing the first and second dampers respectively behind the bypass conduit connection point of the bypass conduit and the waste heat exhaust conduit. By supplying and heating waste heat, the odor can be satisfactorily prevented by the simple structure and the unburned gas can be completely burned without increasing the installation area.

Claims (1)

An apparatus comprising an incinerator and a dryer, wherein the waste heat discharge pipe of the incinerator is connected to a dryer, and an exhaust gas conduit is connected to the outlet of the dryer to dry the sludge by waste heat, wherein the waste heat discharge pipe is connected to the exhaust gas conduit. Bypass conduit is connected to form a reheater behind the bypass conduit connection point of the exhaust gas conduit, and first and second dampers are respectively installed behind the connection point of the bypass conduit of the bypass conduit and the waste heat exhaust pipe. And installing a thermostat in the exhaust gas conduit so that the first and second dampers are opened and closed in opposite directions, respectively, by an output signal of the thermostat.

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