KR100630324B1 - Sludge drying unit - Google Patents

Abstract

The present invention relates to a sludge drying apparatus, the object of which is to provide a plurality of mixing wings between the adjacent blades of the conveying screw to reverse the sludge simply conveyed by the conveying screw to prevent agglomeration of sludge more effective drying It is made, and the vapor discharge hole formed in the upper portion of the drying drum is provided from the both ends to the center smaller so that the suction state generated during the drying of the liquid sludge is made uniform.

The invention is provided with a heater provided on the outer bottom of the drying drum and a drying screw is installed in the drying drum to be driven by the drive motor; A sludge feeder installed to supply sludge to the drying drum of the dryer; A steam discharger for collecting and discharging steam generated in the drying drum; A sludge drying apparatus comprising a steam cooler that cools steam discharged by the steam discharger to discharge air and collects moisture, wherein the dryer is provided with a feed screw blade at a constant pitch on a rotating shaft, and the feed screw blades are separated from each other. A plurality of mixing wings are provided to invert the sludge between neighboring transfer screw blades for more effective drying, and the sludge inlet side is the outlet side of the drying drum so that the suction state of the steam generated therein is uniformly achieved. In addition to being formed larger and smaller from the both ends toward the center is characterized in that the vapor discharge hole is formed.

Sludge, Drying, Transfer Screw, Steam Exhaust, Steam Cooling

Description

Equipment for drying of sludge

1 is a configuration diagram schematically showing a sludge drying apparatus according to the present invention,

2 is a cross-sectional view of the drying furnace according to the present invention;

3 is a detailed cross-sectional view of the drying furnace in FIG.

4 is a plan view showing only the drying chamber drum of the present invention,

5 is a cross-sectional view taken along the line A-A of FIG.

6 is a detailed view showing a steam cooler of the present invention.

<Explanation of symbols for main parts of drawing>

10: sludge feeder 20: dryer 21: drying drum

22: heater 23: space keeping member 24: steam discharge hole

26: feed screw 26a: rotary shaft 26b: screw blade

26c: Mixing wing 27: First motor 28: Sludge discharge outlet

30: steam ejector 31: steam duct 33: pipe

34: second motor 35: blower 40: steam cooler

41: upright Doc 42: cooling hat 43: jet nozzle

44: cold water tank 46: high pressure pump 47: guide member

48: collecting tank 49: pumping pump

The present invention relates to a sludge drying apparatus generated from waste concrete or various construction wastes, and more specifically, to discharge heat and steam into the air while drying sludge produced during various aggregates or turbid water treatment in recycled aggregate production and environmental companies. It relates to a drying device of the sludge for recycled aggregates that can suppress and utilize the generated steam as recycled water.

In general, various sludge treatment apparatuses currently used include filter presses and belt presses, but these apparatuses are not economical because they have large facilities and a small amount of sludge treated compared to their sizes, and thus sludge that is dehydrated. The water content of the cake is not recycled, the sludge cake is mixed with the waste soil in the landfill aggregate, landfill treatment.

Landfills, such as landfills, which are disposed of such wastes, have become increasingly saturated, and thus, there is a problem that excessive treatment costs are required because the landfill soil is to be taken in or removed.

Therefore, a number of methods and apparatuses for recycling landfills have been proposed. Among them, Korean Patent Laid-Open Publication No. 2004-0012415 uses dehydrated cakes and cement obtained by dehydrating construction sludge as raw materials, The blending amount is 5% by weight or more and less than 20% by weight of the whole raw material, and these are mixed with water, the mixture is cured for a certain period of time, dried, and then classified and recycled to a reclaimed sand having a predetermined particle size Was to recover.

However, in the recycling method of the above construction sludge, there is a problem in that a recycling method for recovering the recycled sand by crushing the dehydrated cake and cement as a raw material and curing it is too complicated and not practical.

In addition, the method of transferring the sludge to all the existing screw types is simply transferred to the centerline direction of the screw by the screw blades, so that the sludge may be aggregated, resulting in difficulty in proper drying and deterioration of the drying efficiency. There was this.

An object of the present invention is to research and develop to solve the above-mentioned conventional problems, the sludge itself by treating the sludge with a heater in the drying drum with a dry sludge of less than 5% moisture content, instead of being landfilled Particle sludge, which is a cement paste produced in the production of recycled aggregate of waste concrete, can be recycled to cement products and various concrete products. It is to provide a drying apparatus.

Another object of the present invention is to provide a plurality of mixing wings between the adjacent blades of the transfer screw to flip the sludge simply conveyed by the transfer screw to prevent agglomeration of sludge is more effective drying, drying drum The sludge inlet side of the steam discharge hole formed at the upper side is formed larger than the outlet side, and is provided smaller from both ends toward the center to provide a sludge drying apparatus for recycled aggregates in which the suction state generated when the liquid sludge is dried is made uniform. It is.

Another object of the present invention is to spray the cooling water in the atomizing state by stagnating the steam generated from the sludge in the drying drum in the multi-stage cooling hat, the moisture in the steam is collected by the condensation phenomenon in the lower collecting tank and cooling water The present invention provides a sludge drying apparatus for recycled aggregates, in which only air deprived of heat can be discharged to the atmosphere through the flue.

The present invention for achieving the object as described above, the heater is provided on the outer lower portion of the drying drum is provided with a transfer screw in the drying drum is provided to be driven by a drive motor; A sludge feeder installed to supply sludge to the drying drum of the dryer; A steam discharger for collecting and discharging steam generated in the drying drum; A sludge drying apparatus including a steam cooler that cools steam discharged by the steam discharger to discharge air and collects moisture, wherein the dryer is provided with a feed screw blade at a constant pitch on a rotating shaft and adjacent to each other of the feed screw blade. A plurality of mixing wings are provided to invert the sludge between the conveying screw blades for more effective drying, and the sludge inlet side of the drying drum has an outlet side so that the suction state of the steam generated therein is uniformly formed on the upper part of the drying drum. In addition to being formed larger and smaller from the both ends toward the center is characterized in that the vapor discharge hole is formed.

The steam cooler is characterized in that it is provided with a multi-stage cooling hat for stagnating the steam generated from the sludge in the drying drum and agglomerated moisture in the steam by the cooling water sprayed in the sprayed state.

The lower portion of the cooling shade of the steam cooler is preferably provided with a guide member for guiding the steam discharged from the outlet to the center of the cooling shade.

A space keeping member is provided between the drying drum and the heater to block other heat except for each heater while maintaining the space to accommodate the deformation of the drying drum due to thermal expansion.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram schematically showing a sludge drying apparatus according to the present invention, Figures 2 to 6 are views showing for explaining the sludge drying apparatus of the present invention.

As shown in the figure, the sludge drying apparatus of the present invention is a sludge feeder 10 capable of temporarily storing sludge, a dryer 20 capable of receiving and drying the sludge supplied from the sludge feeder 10, It consists of a steam discharger 30 for collecting and discharging the steam generated in the dryer 20 and a steam cooler 40 for condensing the steam supplied through the steam discharger 30 to collect and recover the moisture.

The sludge feeder 10 is connected to supply the sludge to the drying drum 21, the agitation screw to prevent the solidification of the sludge inside the storage tank 11 is a waste of the liquid or gel state, so as not to harden (12) is rotatably installed and is connected to the output shaft of the stirring motor (13) at the upper end of the stirring screw (12), a sludge pump (14) for pumping the sludge is installed at the lower part and the sludge pump (14) In the pipe 15 connected between the drying drum 21 is provided with a valve 16 for adjusting the amount of sludge fed from the sludge pump 14 to the drying drum 21.

The dryer 20 is a refractory brick 204 is stacked on the frame 202, the cylindrical drying drum 21 is installed on the refractory brick 23, the heater 22 in the outer lower portion of the drying drum 21 Install it. A space keeping member 23 is provided between the drying drum 21 and the heater 22 so that the drying drum 21 receives thermal expansion deformation by the heat generated from the heater 22. The gap holding member 23 is for blocking heat other than the heaters 22 while maintaining the gap.

In addition, the sludge inlet side is formed larger than the outlet side and the steam discharge hole 24 is formed at both ends toward the center so that the suction state of the steam generated therein is uniformly formed at the upper part of the drying drum 21. In the portion where the vapor discharge hole 24 is formed, three temperature sensors 25 are provided to check the temperature of the tip, middle and end portions of the drying drum 21.

In the drying drum 21, a transfer screw 26 is rotatably installed in a center line direction therein, and the transfer screw 26 is connected to and driven by an output rotation axis of the first motor 27 having a reduction gear. do. The conveying screw 26 is formed with a constant pitch of the screw blade 26b on the rotating shaft 26a, and a plurality of mixing blades 26c are formed between the adjacent screw blades 26b of the screw blade 26b. It is. The mixing blade 26c inverts the sludge to be conveyed as the feed screw is rotated so that the sludge can be dried more effectively while preventing the agglomeration. At the end of the drying drum 21, a sludge discharge port 28 through which the dried sludge is discharged while passing through the drying drum 21 is formed.

The steam ejector 30 has a vapor duct 31, which is a space for collecting the vapor discharge holes 24 on the upper part of the drying drum 21, and the outer surface of the steam duct 31 and the upper side of the drying drum 21. The outer surface is coated with a heat insulating material 32, a pipe 33 for discharging the steam collected in the steam duct 31 to the upright duct 41 of the steam cooler 40 is connected to the pipe 33 The blower 35 driven by the 2nd motor 34 is provided.

The steam cooler 40 is provided with an upright doc 41 for guiding the steam supplied by the steam discharger 30, the transfer screw 26 in the drying drum 21 on the upper part of the upright duct 41. The multi-stage cooling hatch 42 which stirs and inverts the steam generated from the sludge to be conveyed is provided while turning over. Each upright duct 41 is provided with spray nozzles 43 in which cooling water is sprayed at a high pressure in each shade portion of the cooling hat 42, and these spray nozzles 43 are provided from a cold water tank 44 in which cooling water is contained. It is connected via the piping 45, and the piping 45 is provided with the high pressure pump 46 which can raise the cooling water in the cold water tank 44. As shown in FIG. The lower portion of the cooling shade 42 of the steam cooler 40 is provided with a guide member 47 for guiding the steam discharged from the end of the pipe 33 of the steam discharger 30 to the center of the cooling shade 42.

In the lower part of the upright duct 41, a cooling tank sprayed to the upper cooling hatch 42 and a collecting tank for receiving particulate water in the vapor condensed by the cooling hatch 42 and falling into water droplets ( 48 is provided, and the water collection tank 48 is provided with a pumping pump 49 for injecting water therein and using it as recycled water.

It will be described the operation process of the sludge drying apparatus according to the present invention configured as described above.

First, the power is applied to the heater 22 of the dryer 20 to preheat the drying drum 21, and then the first motor 27 of the dryer 20 and the second motor 34 of the steam discharger 30. When the sludge pump 14 of the sludge feeder 10 is operated in the state of operating the valve 16, the sludge in the liquid or gel state in the storage tank 11 is supplied to the drying drum 21 while the valve 16 is opened.

At this time, the stirring motor 13 at the upper end of the storage tank 11 is also driven to prevent the sludge of the storage tank 11 from being precipitated and solidified by rotating at a low speed with the stirring screw 12 connected thereto, and the opening degree of the valve 16. Is adjusted according to the internal temperature and abnormal state of the drying drum (21). In this way, the heater 22 installed on the outer lower side of the drying drum 21 generates high heat of 1200 °, but is spaced apart by the space keeping member 23 between the heater 22 and the drying drum 21, and thus the drying drum. (21) is safe because it accommodates deformation due to thermal expansion without being directly affected by high heat.

In this state, when the sludge in the liquid or gel state is supplied into the drying drum 21, the moisture contained in the sludge begins to evaporate by the heat of the heater 22 installed in the lower portion of the drying drum 21. At the same time, the sludge is moved in the direction of the center line of the rotating shaft 26a by the screw blades 26b of the feed screw 26, and the mixing blades 26c formed between the screw blades 26b are inverted and stirred. By the process of preventing the agglomeration of the sludge, the heat of the heater 22 is uniformly supplied to the entire sludge.

Therefore, the more effective drying of the sludge is achieved by moving toward the end from the beginning of the drying drum 21. Thus, when the water is discharged through the sludge outlet 28 of the drying drum 21, the moisture of the sludge is dried to 5% or less. do.

While the sludge is dried in the drying drum 21 by the heater 22 as described above, the steam generated from the sludge is vapor on the drying drum 21 due to the suction force of the blower 35 installed in the pipe 33. It is collected to the steam duct 31 of the steam discharger 30 through the discharge hole 24, and is immediately discharged to the upright duct 41 of the steam cooler 40 through a pipe 33 connected to the steam duct 31. do. At this time, the steam discharge hole 24 in the upper part of the drying drum 21 is formed larger than the outlet side of the sludge inlet side, and is formed smaller from both ends toward the center, so that the suction state of the steam generated inside the drying drum 21 is reduced. It will be uniform.

In other words, since a large amount of steam is generated in the inlet portion of the sludge supplied with liquid or gel sludge, the vapor discharge hole 24 should be large, and the middle portion of the steam duct 31 has a pipe 33 thereon. The steam outlet hole 24 should be made small because the steam outlet hole 24 is easily positioned and the steam outlet hole 24 is formed to be small. shall.

In addition, three temperature sensors 25 are provided in the drying drum 21 of the steam duct 31 in which the steam discharge holes 24 are formed, and the power of the heater 22 separated by at least the number of the temperature sensors 25 is provided. By providing to control the temperature inside the drying drum 21 can be controlled to be constant. For example, the whole temperature is controlled at the same temperature, or the front end is 600 ??, the middle part is 500 ??, and the rear part is 400 ?? Each can be controlled by the back.

As described above, steam is guided along the guide member 47 to the cooling hatch 42 above the upright duct 41 on the inner wall of the upright duct 41 at the end position of the pipe 33. After being guided to and stagnated, it rises upward through the space between the edge of the edge and the upright duct 41 and repeats this process several times. In such a state, the cooling water of the cold water tank 44 is injected into the cooling hatch 42 through the injection nozzle 43 by injecting the cooling water into the high pressure pump 46, and the steam condenses the water in the steam to form droplets. Together with the cooling water injected from the injection nozzle 43, the collection tank 48 is collected. In addition, the air in the steam is released to the atmosphere after the heat is deprived by the cooling water injected from the injection nozzle (43).

And the water collected in the collecting tank 48 can be used to raise the water by using a pump pump 49 as recycled water.

And Figure 7 is another embodiment showing a sludge drying apparatus according to the present invention, when the sludge treatment capacity is large, the dryer 20 is installed in parallel with two or more (A to D) of the steam duct (31) It can be constructed by connecting from one pipe 33 at the top.

As described above, the sludge drying apparatus of the present invention is capable of recycling sludge itself rather than landfilling by treating the sludge with a heater in a drying drum and drying the sludge with a moisture content of less than 5%. Soil sludge is a useful invention that can be recycled to cement products and various concrete products, which are various uses, and cement paste, which is a cement paste generated in the production of recycled aggregates of waste concrete.

In addition, the present invention provides a plurality of mixing wings between the adjacent blades of the transfer screw to invert the sludge conveyed by the conveying screw to prevent the sludge agglomeration is more effective drying is formed on the top of the drying drum It is a useful invention that the vapor discharge hole is made smaller from both ends to the center so that the suction state of the steam generated when the sludge is dried in the liquid or gel state is made uniform, and thus more efficient drying is achieved.

In the present invention, the steam generated from the sludge in the drying drum is stagnated in the multi-stage cooling hat, spraying the cooling water to the cooling hat to condense moisture in the steam to be collected in the collection tank of the lower portion, and only the air deprived of heat by the cooling water. It is a useful invention that is emitted to the atmosphere through the year.

Claims (4)

A heater provided at an outer lower side of the drying drum and a transfer screw installed in the drying drum to be driven by the driving motor; A sludge feeder installed to supply sludge to the drying drum of the dryer; A steam discharger for collecting and discharging steam generated in the drying drum; In the sludge drying apparatus comprising a steam cooler for cooling the steam discharged by the steam discharger to discharge air and collect moisture, The dryer is provided with a feed screw blade at a constant pitch on the rotary shaft and a plurality of mixing wings are provided to turn over the sludge between adjacent feed screw blades of the feed screw blades for more effective drying, the upper part of the drying drum The sludge inlet side is formed larger than the outlet side so that the suction state of the steam generated therein is uniformly formed, and the steam discharge hole is formed smaller from both ends toward the center. The method of claim 1, The steam cooler is a sludge drying apparatus characterized in that the stagnant steam generated from the sludge in the drying drum is provided with a multi-stage cooling hat for aggregating the moisture in the steam by the cooling water sprayed in the sprayed state. The method of claim 1, Sludge drying apparatus, characterized in that the lower portion of the cooling shade of the steam cooler is provided with a guide member for guiding the steam discharged from the outlet to the center of the cooling shade. The method of claim 1, Drying apparatus between the drying drum and the heater is provided with a spacing holding member for blocking other heat than each heater while maintaining the interval to accommodate the deformation of the drying drum by thermal expansion.

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