KR100194998B1 - Sludge drying method and apparatus for performing the same - Google Patents

Abstract

Disclosed is a sludge drying method suitable for effectively drying a large amount of sludge by injecting various sludges at high speed into a dryer, and an apparatus for performing the same. The hot air for drying the sludge flows in the tangential direction of the drying furnace to turn inside the drying furnace, transfers the sludge to the sludge injection unit, and crushes the sludge first by a high speed rotating impeller and transfers the sludge into the drying furnace. . The sludge that is primarily ground is sprayed into the drying furnace as fine particles. The refined sludge injected into the drying furnace is transported in the direction of the outlet while being dried by hot air, and the sludge is secondarily crushed in the drying furnace to increase drying efficiency. The dried sludge is recovered at the outlet side of the drying furnace and particles of the sludge suspended in the drying furnace are collected using a cyclone collector, and the purified hot air is discharged to the outside. The sludge introduced into the dryer is finely pulverized to increase the dry surface area of the sludge, and the hot air is introduced into the drying furnace while turning, thereby maximizing the contact surface area between the sludge and the hot air. Therefore, even a large amount of sludge is dried quickly.

Description

Sludge drying method and apparatus for performing the same

The present invention relates to a sludge drying method and an apparatus for performing the same, and more specifically, to a sludge drying method suitable for efficiently drying a large amount of sludge by injecting various sludges at high speed into a drier and an apparatus for performing the same. It is about.

In general, sludge refers to contaminants deposited in water supply and sewage of general households or industries. The sludge is generated by wastewater discharged from chemical plants or dye and pigment factories artificially promoting precipitation in the treatment process. Or by natural precipitation in rivers and lakes.

In particular, in the waste water treatment process of a factory, biological precipitation, flocculation sedimentation, etc. may be performed, and the sludge may be promoted to purify the waste water. This is one of the important processes in the wastewater treatment process. As such, the sludge generated during the wastewater treatment is periodically collected, dried and treated. As a method of drying the sludge, a rotary kiln rotary rotary dryer is widely used.

Conventional rotary kiln drying method is a method of drying the sludge by injecting the sludge into a steel cylindrical drying furnace using a heating device such as a burner on one side, blowing a flame or hot air from the burner. That is, when the sludge is introduced into the drying furnace in a predetermined amount, the drying furnace rotates and the sludge is transferred in the direction of the outlet. At this time, hot air is introduced by a heating device such as a burner attached to the inlet of the drying furnace, and the sludge in the drying furnace is dried.

In addition, in the drying furnace, a plurality of blades constituting curved surfaces are rotated, that is, the impeller is rotated to finely crush the dried sludge while performing drying and discharged to the outside at the same time.

However, such a conventional rotary kiln type dryer is suitable for a small amount of sludge drying but is inefficient for a large amount of sludge drying. The thermal efficiency of the rotary kiln dryer is about 35-40%, which is inversely proportional to the amount of sludge injected.

Therefore, in order to process a large amount of sludge, the size and volume of the dryer are increased, and energy consumption is excessive. In other words, in the conventional dryer, when a large amount of sludge is added, the cost required for the sludge drying apparatus becomes excessive, thermal efficiency decreases, and space occupancy increases.

In addition, since the length and diameter of the drying furnace are inevitably increased in order to process a large amount of sludge, the length of the rotating long axis is also increased in proportion thereto. Therefore, when a large amount of sludge is dried or the dryer is used for a long time, there is a problem in that the shaft is deformed as well as the bending of the long axis is deteriorated and durability is reduced.

The present invention has been made in order to solve the above problems, the first object of the present invention is to increase the dry surface area by injecting the sludge finely into the dryer, by turning the hot air into the drying furnace by sludge and hot air It is to provide a sludge drying method to maximize the surface area of contact with the rapid drying.

It is a second object of the present invention to provide an apparatus suitable for carrying out such a sludge drying method.

1 is a perspective view showing a sludge drying apparatus according to an embodiment of the present invention.

2 is a flow diagram for explaining a sludge drying method according to a temporary embodiment of the present invention.

FIG. 3 is a detailed view of the sludge injection part shown in FIG.

* Explanation of symbols for main parts of the drawings

100: drying furnace 110: sludge input portion

112: stirring drum 114: stirrer

115: drive shaft 117: stirring blade

119: input device 120: drive motor

130: hot air supply device 132: burner

134: combustion furnace 136: circular duct

140: sludge injection unit 141: grinding drum

142: drive shaft 144: injection wing

150 crushing unit 152 crushing opening

154: shredding block device 160: sludge recovery unit

162: screw device 170: cyclone device

200: control device

In order to carry out the first object, the present invention, the hot air supply step of turning in the drying furnace by introducing hot air in the tangential direction of the drying furnace; A sludge feeding step of transferring the sludge to the sludge input unit and injecting the sludge into the drying furnace; A sludge spraying step of spraying the sludge conveyed in the sludge feeding step into the drying furnace while grinding the sludge into fine particles; A secondary crushing step of transferring the sludge injected into the drying furnace in the sludge spraying step in the direction of the outlet, drying with hot air and crushing the sludge masses secondarily; A sludge recovery step of recovering the dried sludge at the outlet side of the drying furnace through a secondary grinding step; In addition, the sludge drying step of passing through the sludge collecting the sludge particles floating in the drying furnace, and the purified hot air is discharged to the outside provides a sludge drying method consisting of.

According to the present invention, the sludge spraying step is inserted and fixed on the shaft of the drive shaft, the sludge is introduced into the grinding drum provided with a plurality of injection blades having blades at both ends, and the injection blade is rotated at high speed to perform the injection. The injection blade is rotated at 800 RPM or more, and the secondary crushing step is carried out by crushing the sludge by placing a plurality of shredding in the center of the drying furnace by moving the cloud into the drying furnace in accordance with the rotation of the drying furnace.

In order to carry out the second object, the present invention is installed on one side of the inlet of the drying furnace installed to rotate, hot air consisting of a burner for ignition, a combustion furnace for complete combustion of the burner and a duct for supplying hot air into the drying furnace. Feeder; A sludge inlet which receives sludge from the inlet chamber, which is spaced from the drying furnace, through the transfer device, and is installed in the stirring drum to rotate by receiving power from the driving motor to stir the sludge to inject the sludge into the drying furnace; A sludge injection unit connected to the supply device of the sludge input unit for crushing the sludge into fine particles and spraying the sludge into the drying furnace; A crushing unit which is installed in the center of the drying furnace and consists of a crushing port and a rubbing block device for crushing the sludge lump in the sludge sprayed from the sludge spraying unit; A sludge recovery unit which is installed at an outlet side of the drying furnace and comprises a screw device for discharging the dried sludge to the outside of the drying furnace and a discharge chamber in which the discharged sludge is loaded; A cyclone apparatus installed at an exit side of the drying furnace to collect sludge particles floating in the drying furnace by hot air supplied by finely pulverizing, and a fan for discharging the purified hot air upward; In addition, the control device is installed on one side of the drying furnace, the sludge is introduced before crushing before being introduced into the drying furnace, pulverizing and spraying in the interior of the drying furnace, the control device for controlling each device to perform the overall control to recover the treated sludge It provides a sludge drying apparatus consisting of.

Preferably, the sludge injection unit is configured by inserting and fixing a plurality of injection blades having blades at both ends on the axis of the drive shaft rotating at a predetermined rotation speed in the cylindrical grinding drum. In addition, the dosing device is installed between the drying furnace and the sludge input portion is made of a screw device for transferring the sludge while rotating.

According to a preferred embodiment of the present invention, the duct in the hot air supply device is installed while making a curved inward from the combustion furnace to supply hot air in the tangential direction of the drying furnace. In addition, the sludge input part is connected to the drive motor is composed of a plurality of stirring blades attached to the rotating drive shaft.

In the present invention, the plurality of shredding holes in the shredding part are made of stainless steel, and the shredding ball blocking device in the shredding part is constructed by attaching a metal net smaller than the diameter of the shredding part to the inside of the drying furnace.

According to the present invention, the sludge introduced into the dryer is finely pulverized to increase the dry surface area of the sludge, and the hot air is introduced into the drying furnace while turning, thereby maximizing the contact surface area between the sludge and the hot air. Therefore, even a large amount of sludge is dried quickly.

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

1 is a perspective view showing a sludge drying apparatus according to the present invention, FIG. 2 is a schematic diagram illustrating a sludge drying method according to the present invention, and FIG. 3 is a detailed view of the sludge injection unit.

As shown, the sludge drying apparatus of the present invention is installed to be inclined in the direction of the discharge port on the base 1 to transfer the sludge injected into the drying furnace 100 in the direction of the discharge port. The sludge inlet 110 is installed at the inlet through which the sludge is introduced. The sludge input part 110 is supplied to the drying furnace 100 while rotating while receiving power from the driving motor 120 installed to be spaced apart from the drying furnace 100. As shown in FIG. 2 and FIG. 3, the sludge inlet 110 is installed by the inflow chamber (not shown) and the inflow screw (not shown), which are installed at a predetermined interval from the drying furnace 100 and loaded with sludge. Connected. The sludge inlet 110 is a stirring drum 112 for receiving the sludge, the stirrer 114 installed inside the stirring drum 112 and the sludge completely stirred in the stirrer 114 to the drying furnace 100 It is composed of an input device 119 to supply.

The dosing device 119 is, for example, consists of a screw feeder for transferring the stirred sludge while rotating. One side of the inlet through which the sludge is introduced into the drying furnace 100 is provided with a hot air supply device 130 for generating hot air into the drying furnace (100). The hot air supply device 130 generates burners 132 for ignition, hot air by introducing external air into the burners 132, and a combustion furnace 134 and generation for complete combustion of the burners 132. The hot air is composed of a circular duct 136 is installed to swing in the interior of the drying furnace (100).

The circular duct 136 is mounted to form a curved surface from the combustion furnace 134 to the interior of the drying furnace 100 to supply hot air in a tangential direction inside the drying furnace 100 to provide hot air to the drying furnace 100. I turn around. The sludge injector 140 for crushing the sludge into fine particles and spraying the sludge into the main body is installed in the drying furnace 100 connected to the injecting device 119 of the sludge injecting unit 110. The sludge injection unit 140 is rotated by a power supplied from a driving motor (not shown) mounted in the cylindrical grinding drum 141 as shown in FIGS. 2 and 3. A plurality of injection blades 144, which are bent at different angles in a radial direction, are attached thereto. In the center of the drying furnace 100, the crushing unit 150 for crushing the sludge lumps are not completely dried, but is installed. As shown in FIG. 2, the shredding part 150 includes a plurality of shredding holes 152 made of stainless steel in the center of the drying furnace 100, and shredding at the outlet side of the drying furnace 100. A crush hole block device 154 for controlling the sphere 152 is installed. For example, the shredding blocker 154 attaches a metal net smaller than the diameter of the shredding hole 152 to the inside of the drying furnace 100 to allow sludge to pass therethrough, and to allow the shredding hole 152 to be separated. You can crack down. The sludge recovery unit 160 for recovering the dried sludge is installed at the outlet side of the drying furnace 100. The sludge recovery unit 160 includes a screw device 162 for discharging the dried sludge to the outside of the drying furnace 100 and a discharge chamber (not shown) in which the discharged sludge is loaded.

In addition, a cyclone device 170 is installed at the outlet side of the drying furnace 100 to collect the sludge particles floating in the drying furnace 100 by finely crushed and supplied hot air. Above the cyclone device 170, a duct 172 including a fan for discharging hot air is formed. Then, the control device 200 for controlling the overall system of the sludge drying apparatus is installed and configured.

Here, as shown in FIG. 3, the sludge injection unit 140 rotates at a high speed, that is, 800 RPM or more by a drive motor (not shown) mounted in the cylindrical grinding drum 141. It is configured by inserting and fixing a plurality of grinding blades 144 having blades at both ends for finely crushing the sludge introduced on the shaft.

The detailed operation of the present invention configured as described above is as follows.

When the sludge drying apparatus according to the present invention is operated, the control device 200 ignites the burner 132 of the hot air supply device 130 installed at one side of the inlet through which the sludge is input, and generates hot air by receiving external air. Let's do it. The hot air is swung in the drying furnace 100 by flowing in a tangential direction of the drying furnace 100 through a circular duct 136 mounted to form a curved surface from the combustion furnace 134 to the interior of the drying furnace 100. An inflow screw (not shown) is operated to transfer the sludge to the sludge feeding unit 110 in an inflow chamber (not shown) in which the sludge is loaded. When the sludge is introduced into the sludge inlet 110, the drive shaft 115 is rotated by the drive motor 120 in the cylindrical stirring drum 112. A plurality of stirring blades 117 are inserted and fixed on the shaft of the drive shaft 115 and have blades at both ends to completely stir the introduced sludge. That is, the sludge is in a state of a kind of mud, and the sludge input part 110 performs a kind of stirring operation to select the sludge lump by a plurality of rotating stirring blades 117. The stirred sludge is supplied to the drying furnace 100 by a dosing device 119 consisting of a screw device for transferring the sludge while rotating. The sludge injection unit 140 in the drying furnace 100 is inserted into the shaft of the drive shaft 142 that rotates more than 800 RPM by a drive motor (not shown) mounted in the cylindrical grinding drum 141 by receiving the sludge. The sludge is pulverized into fine particles by a plurality of pulverizing blades 144 having blades on both ends thereof, and sprayed into the drying furnace 100. Accordingly, the finely crushed sludge is dried in the hot air supply device 130. The surface area of contact with the hot air is increased to increase the drying speed. The sludge injected into the drying furnace 100 continues to move in the direction of the outlet by the angle made by the base 1, and is dried by the hot air supplied from the hot air supply device 130, and is not completely dried during the drying process. The aggregated sludge mass is secondary crushed by the crushing unit 150. The crushing unit 150 is composed of a plurality of crushing holes 152 made of stainless steel placed inside the center of the drying furnace 100 and a crushing block blocking device, so that when the drying furnace 100 rotates, it moves inwardly and aggregates. Shred the sludge mass that is present. The sludge secondaryly crushed by the crushing unit 150 is recovered by the sludge recovery unit 160 provided at the outlet side of the drying furnace 100. That is, the sludge dried by the screw device 162 in the sludge recovery unit 160 is discharged to the outside of the drying furnace 100, the discharged sludge is loaded in the discharge chamber (not shown). In addition, a cyclone device 170 is installed at the outlet side of the drying furnace 100 to collect the sludge particles floating in the drying furnace 100 by the hot air supplied finely crushed. The hot air passing through the drying furnace 100 is discharged to the outside by the duct 172 including the fan.

According to the present invention, a plurality of jetting blades having blades are inserted into a device for supplying sludge to a drying furnace, and the sludge injected into the drying furnace is finely pulverized and sprayed into the drying furnace. Therefore, by increasing the hot air supplied into the drying furnace in a state in which the contact surface area of the sludge is maximized, the drying efficiency is improved to rapidly dry a large amount of sludge.

Although one embodiment of the present invention has been described in detail with reference to the accompanying drawings, the present invention is not limited thereto, and improvements or modifications thereof can be made without departing from the ordinary knowledge of those skilled in the art.

Claims (11)

Hot air supply step of turning the hot air in the tangential direction of the drying furnace and turning inside the drying furnace; A sludge feeding step of transferring the sludge to the sludge input unit and stirring the sludge into the drying furnace; A sludge spraying step of spraying the sludge stirred in the sludge feeding step into the drying furnace while grinding the sludge into fine particles; A second crushing step of transferring the sludge injected into the drying furnace in the sludge spraying step in a direction of an outlet, drying with hot air and crushing the sludge masses secondarily; A sludge recovery step of recovering the sludge dried by passing the secondary grinding step at the outlet side of the drying furnace; And a cyclone collection step of collecting the sludge particles floating in the drying furnace and passing the sludge recovery step, and discharging the purified hot air to the outside. According to claim 1, The sludge spraying step is inserted into the shaft of the drive shaft, the sludge is injected into the grinding drum provided with a plurality of injection blades having blades at both ends, and the grinding blade is rotated to perform the grinding Sludge drying method, characterized in that. The sludge drying method according to claim 2, wherein the injection blade is rotated at 800 RPM or more. The method of claim 1, wherein the secondary crushing step is characterized in that the crushing of the sludge is carried out by placing a plurality of crushing spheres in the center of the drying furnace by moving the cloud into the drying furnace in accordance with the rotation of the drying furnace. Sludge drying method. It is installed at one side of the inlet of the drying furnace 100 is installed to rotate, the burner 132 for ignition, the combustion furnace 134 and the hot air for the complete combustion of the burner 132 into the drying furnace 100 Hot air supply device 130 made of a duct 136 to; The stirring drum 112 is installed to be spaced apart from the drying furnace 100 to receive the sludge, the stirring drum 112 is installed in the stirring drum 112 to rotate by receiving power from the driving motor 120 to stir the sludge. And a sludge inlet unit 110 including an injector 119 for injecting the sludge stirred in the stirrer 114 into the drying furnace 100. A sludge injection unit 140 connected to the input device 119 of the sludge injection unit 110 to inject the sludge into the drying furnace 100 with fine particles; A crushing unit which is installed in the center of the drying furnace 100 and composed of a crushing hole 152 and a crushing block blocking device 154 for crushing the sludge lumps in the sludge injected from the sludge spraying unit 140 150; Sludge recovery part consisting of a screw device 162 for discharging the sludge installed and dried at the outlet side of the drying furnace 100 to the outside of the drying furnace 100 and a discharge chamber in which the discharged sludge is loaded ( 160); It is installed at the outlet side of the drying furnace 100 to collect the sludge particles floating in the drying furnace 100 by the finely crushed and supplied hot air, the upper includes a fan for discharging the purified hot air A cyclone device 170; And, it is installed on one side of the drying furnace 100 is crushed before the sludge is introduced into the drying furnace 100, the grinding and spraying in the interior of the drying furnace 100, the treated Sludge drying apparatus consisting of a control device 200 for controlling each device to perform the overall control to recover the sludge. The sludge injection unit 140 is configured by inserting and fixing a plurality of injection blades 144 having blades at both ends on an axis of the driving shaft 142 rotating in the cylindrical grinding drum 141. Sludge drying apparatus, characterized in that. The sludge drying apparatus according to claim 5, wherein the dosing device 119 is installed between the drying furnace 100 and the sludge inlet part 110 to rotate the sludge to transfer the sludge. . The method of claim 5, wherein the circular duct 136 in the hot air supply device 130 is installed while forming a curved surface inward from the combustion furnace 134 to supply hot air in the tangential direction inside the drying furnace (100). Sludge drying equipment The sludge input part 110 is sludge characterized in that a plurality of stirring blades 117 is attached to the drive shaft 115 is connected to the drive motor 120 is rotated. Drying device The sludge drying apparatus according to claim 5, wherein the plurality of shredding holes (152) in the shredding part (150) are made of stainless steel. The method of claim 5, wherein the shredding block blocking device 154 in the shredding unit 150 is characterized in that the metal mesh less than the diameter of the shredding hole 152 is configured by attaching to the interior of the drying furnace (100). Sludge drying device.