KR20150012337A - The sludge drying method by air current and air pressure of ventury eject type corresponding to the variable percentage of water content - Google Patents

Abstract

In order to dry and recycle organic sludge such as wastewater and livestock manure, slurry of 60 ~ 85% moisture content, slag dust of steel making mill, coal ash of power plant, limestone, stone powder, sawdust and already dried sludge powder After mixing and mixing in a mixer, the moisture content of the mixed sludge is lowered to 30 to 45%, and then the feed and venturi eject ducts are transported through a nozzle at a high temperature and high pressure by blowing air and hot air (150 to 250 ° C.) And the mixed sludge which is dried and dried by the diffusion is dried by continuously passing through a plurality of ejections in which a high temperature hot air is introduced and a high pressure is formed, thereby pulverizing and diffusing into a particle state, and a cyclone (CYCLONE) In the course of passing, the fine powder and the lump powder were separated, and the lump powder was mixed with the sludge again, By repeating the method of mixing and conveying the sludge to the mixer to provide a method for drying the sludge.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge drying method using a Venturi-type air flow pressure corresponding to a water content variable,

The present invention improves on the technology of Patent Application No. 2007-97969 (Venturi type sludge drying method using an air current pressure difference) concerning a method for environmentally friendly drying and recycling of organic sludge such as wastewater and livestock manure, The sludge transferred from the storage tank flows into the hopper and the sludge introduced into the hopper is mixed with the dry sludge after being mixed with the dry sludge and then crushed while being crushed through the crusher to decrease the water content and to provide a strong air to the reduced sludge (150 ~ 250 ° C) and blowing to form a high pressure when the compressed sludge becomes a conveying pipe, and the sludge is pressurized to a high pressure A process of forming a particle state while being crushed and diffused in a process of passing the nozzle at a sub-velocity (a velocity close to a sonic velocity) In order to transfer the sludge to the high pressure, high temperature and high speed when the sludge in the granular state passes through the duct on which the plurality of ejects are formed, the hot air is supplied to the duct at a high temperature, A process of pulverizing the mixed sludge while diffusing in a process of passing through the ejection of the duct, and a process of pulverizing the pulverized mixed sludge by passing the pulverized mixed sludge through the first cyclone, Powder or lightweight sludge is conveyed upward and conveyed to the second cyclone while the heavy material is discharged downward and a part of the dry sludge discharged from the damper is conveyed to the storage room or the incineration chamber and a part is conveyed to the duct, By the centrifugal force of the cyclone, the fine powder and the lightweight sludge of the transferred sludge And a sludge drying method in which the sludge is collected and discharged into a sludge mixer, a storage chamber, or an incineration chamber through a damper while discharging the lightweight sludge.

Patent Application No. 2007-97969 discloses that when the sludge introduced into the hopper, the powder discharged from the cyclone, and the dried sludge in a lump state are mixed in a mixer and crushed in a crusher and stirred, the inner pressure of the transfer pipe is increased by blowing and hot air There is a problem that the sludge mixture flows backward before passing through the nozzle like a sludge mixture at a high temperature and a high pressure and there is a problem that the hot air and the air flow are backwashed and the sludge mixture diffuses through the nozzle, There is a problem that the internal pressure of the duct is increased and the internal pressure is reversely flowed into the hot air storage. When the sludge mixture is transferred to the high temperature, high pressure and high speed state, the bent part of the duct is caused by the collision of the sludge There was a problem to damage.

The present invention relates to a method of mixing and pulverizing sludge having a moisture content of 60 to 85% and dried sludge powder having a moisture content of 10 to 15% to reduce the water content of the sludge and to discharge the dust, .

The objective of the present invention is to form mixed sludge with reduced water content in the form of noodles or ferrets using a compressor to facilitate explosion, crushing and spreading during the transferring process.

By supplying air and hot air to the conveying pipe through which the mixed sludge is conveyed, the mixed sludge is allowed to pass through the nozzle at a high temperature and a high pressure so as to pass the moving speed of the mixed sludge close to the subordinate speed (sound speed) Diffusion, and collision of the mixed sludge to form a fine powder of the mixed sludge, thereby achieving rapid drying.

When the mixed sludge that forms the diffusion and collision and fine powder in the transfer pipe moves the extended duct, it increases the internal pressure of the duct to high temperature and high pressure and passes through the sludge as it passes through the ejection And to increase the drying rate due to the diffusion of the mixed sludge and the pulverization by the collision.

So that the hot air flowing into the duct does not flow backward.

The objective is to prevent the damage of the duct by the collision of the mixed sludge moving at high speed from the duct.

The sludge transferred from the sludge storage tank flows into the hopper and the sludge introduced into the hopper is mixed with the dry sludge after being mixed with the dry sludge and then crushed while being crushed through the crusher to lower the water content. (150 ~ 250 ° C) and blowing air to form a high pressure when the compressed sludge becomes a conveying pipe, thereby forming a high pressure, and the sludge is pressurized at a high pressure The sludge is pulverized and diffused in a process of passing through the nozzle at a speed lower than the speed of sound to form a particle state, and when the sludge in the form of particles passes through a duct having a plurality of ejections, , A high temperature hot air is supplied to the duct to feed at a high speed, but a booster is mounted to prevent reverse wind A process in which the mixed sludge is passed through the first cyclone while being diffused in a process of passing through the ejection of the duct and a process in which the crushed mixed sludge passes through the first cyclone, The fine powder or the lightweight sludge is conveyed upward and conveyed to the second cyclone while the heavy material is discharged downward and a part of the dry sludge discharged from the damper is transferred to the storage room or the incineration chamber and the part is transferred to the duct, The fine powder and sludge of the sludge transferred to the cyclone are collected by the centrifugal force of the cyclone, the light powder sludge is discharged, the part is transferred to the sludge mixer while the light sludge is discharged to the storage room or the incineration chamber.

The sludge introduced through the hopper is mixed with the dried sludge powder of the second cyclone to form a mixed sludge to lower the water content of the mixed sludge.

The mixed sludge having a decreased water content is discharged into a noodle shape or a ferret shape by using a compressor, and is finely pulverized by diffusion and impact due to explosion when it passes through a nozzle at a high pressure and a high temperature in a transfer pipe.

The blower drawn into the hot air tube is formed by a nozzle and the length of the nozzle is adjusted so that the nozzle of the blower adjusts the speed of passing through the nozzle by adjusting the distance between the nozzle and the nozzle.

The speed of the airflow conveyed to the conveyance pipe and the duct is formed as the subordinate speed so that the sludge and the hot air which are connected to the duct are easily flowed into the duct without flowing backward.

An extension pipe is formed at the end of the horizontal transfer pipe of the duct so that the sludge transferred to the inside of the extension pipe is filled, and the moving sludge is moved while colliding with the filled sludge, thereby preventing the damage of the duct.

A plurality of ejectors are installed in the duct to induce explosion, crushing, collision and diffusion of the sludge passing through the ejection to powder.

The sludge dried and pulverized in the duct passes through the first cyclone to control the type and amount of the sludge transferred to the second cyclone, the sludge introduced into the second cyclone is discharged from the damper, the fine sludge is discharged to the dust collector, Thereby preventing discharge of the liquid.

The duct may be formed in a circular shape, may be formed in a quadrangular shape, and may have a coil shape to increase the drying time.

The sludge drying method according to the present invention is characterized in that the water content of the mixed sludge is reduced by mixing the sludge having a water content of 60 to 85% with the dried sludge, and the dried sludge produced in the drying process is continuously used for mixing the sludge of 60 to 85% Since it can dry 60 ~ 85% of sludge with minimum amount of dry sludge, it does not need to manage separate dry sludge. It is effective in that it forms pulverization by diffusion, explosion and collision in passing through duct, (Speed reaching sonic speed) nozzle and the passage of ejection through the nozzle and ejection by forming high temperature and high pressure in the conveyance pipe and duct by hot air and blowing air. There is an effect that the mixing time of the mixed sludge is shortened and the drying time is shortened, and when the mixed sludge is refined and dried, Fine dust is mixed gases from the dust collector and drying process through a dust collector and filter has the effect of preventing environmental pollution, such as gas, so the combustion thereby odor and dust.

1 is a schematic diagram of a sludge drying apparatus according to the present invention;
Fig. 2 is a schematic view showing a high-temperature high-pressure and diffusion and pulverization in a transfer pipe
3 is a schematic view of the booster
Figure 4 shows the state of movement of the mixed sludge
Fig. 5 is a diagram
Figure 6 shows the action diagram of the second cyclone
Fig. 7 is a schematic view of another duct of the present invention

The present invention is characterized in that a hopper 31a for introducing sludge and a hopper 31b for introducing a drying sludge are formed and the drying sludge introduced from the sludge and hopper 31b or the damper 29b of the second cyclone 27b A process in which the mixed sludge pulverized in the pulverizer 33 for pulverizing the mixed sludge mixed in the mixer 32 for mixing the incoming dry sludge is discharged in the form of a noodle or a ferret by the compression of the compactor 38, In the process of providing high temperature hot air (150 to 250 ° C) and blowing air to the sludge 24 to form a high pressure and allowing the sludge 24 to pass through the nozzle 13a at a speed lower than the speed of sound The mixing sludge 24 is pulverized into particles by the explosion and diffusion and the mixed sludge 24 in the granular state is discharged to the nozzle 13a of the transfer pipe 12 which forms the sub- And high temperature and high temperature Explosion, and collision while passing through the ejection 14 of the duct 11 constituting the subordinate to the submerged duct 11, making the moisture of the mixed sludge gasified and refining the mixed sludge, An extension pipe 22 formed to prevent damage of the duct 11 at the bent portion of the duct 11 while moving the duct 11 while the sludge 24 being conveyed at a high speed is moved, The mixed sludge pulverized in the duct 11 is passed through the first cyclone 27a while the size of the mixed sludge is selectively filtered by the centrifugal force and the fine dust of the mixed sludge having passed through the second cyclone 27b is sucked A condenser 40 for condensing moisture, and an adsorber 36 composed of activated carbon for removing odors, and is discharged by blower 35.

1 shows a system for carrying out the drying method according to the present invention.

FIG. 2 shows the structure of (1) (2) in FIG. 1 in detail. The sludge flowing into the inflow pipe 37 from the mixing space 19 in which the high pressure is formed by the injection by the nozzle 13a moving backward passes through the nozzle 13b.

FIG. 3 is a detailed view of the structure of FIG. 3 (3), showing the heat structure of the hot air 17 tube that flows into the duct 11.

FIG. 4 is a detailed view showing the sludge circulating in the duct 11 and the structure of 3 in FIG. 1 in detail, and shows a state in which the dried mixed sludge of the first cyclone 27a is mixed with the duct 11. FIG.

Fig. 5 is a detailed view of the structure of Fig. 1 (5), showing the operating state of the sludge 26 passing through the ejection 14

Fig. 6 shows the action of sludge moving in the extension pipe 22 of Fig.

Fig. 7 shows a structure for deforming the duct 11 to lengthen the drying time.

The present invention relates to a method for increasing the drying effect of wastewater and animal manure sludge as shown in Fig. 1 and providing a clean drying environment.

The present invention is characterized in that a hopper 31a for introducing sludge 24 from a storage chamber 41a having a water content of 60 to 85% and a hopper 31b for introducing dry sludge powder is formed from the upper left portion, A mixer 32 for mixing the dry sludge powder flowing from the hopper 31b or the dry sludge powder flowing from the second cyclone 27b and the sludge together with the mixed sludge having a moisture content of 35-40% A sludge mixed with the sludge is connected to the mixer 32 so that the mixed sludge is discharged to the incinerator 42 through the damper 29c And a part of which is compressed and formed into a noodle or a ferret shape is formed and a quantitative feeder 18 is formed which is configured to feed the mixed sludge discharged in conjunction with the compressor 38 by the same amount .

The mixed sludge transferred from the quantitative feeder 18 is formed to flow into the transfer pipe 12 through the inlet pipe 37.

In the front of the transfer pipe 12, a nozzle 13b for compressing and discharging cold air, hot air, and sludge introduced into the inlet pipe 37 is formed.

The nozzle 13a and the hot air tube 17 are connected to the rear of the transfer tube 12 to transfer hot air to the front of the transfer tube 12 by blowing air to form a high temperature and high pressure state behind the nozzle 13b And the mixed sludge flowing into the inlet pipe 37 passes through the nozzle 13b by the temperature and pressure difference between the front and the rear of the nozzle 13b while passing through the nozzle 13b, The moisture of the mixed sludge is formed to be vaporized in the course of rapid refinement and refinement of the sludge.

The mixed sludge dried while passing through the nozzle 13b is formed so as to move to the duct 11 having a large space.

In order to increase the moving speed of the mixed sludge in the duct 11 since the pressure in the duct 11 having a large space is lower than that in passing through the nozzle 13b and the moving mixed sludge moves at a speed equal to or less than the sub- As shown in FIG. 3, a plurality of hot air pipes 17 are connected to the duct 11 so as to introduce a large amount of hot air at a high temperature.

A booster 15 including a duct 11 where the hot air duct 17 for transferring the hot air is heated is formed and the hot air introduced from the hot air duct 17 is supplied to the duct 11 through the booster 15, And the inclined grooves 23 of the duct 11 into which the hot air of the booster 15 flows are inclined in a direction in which the mixed sludge of the duct 11 moves.

The mixed sludge, which is connected to the duct 11 by a slope in the direction in which the mixed sludge moves, is moved through the transfer pipe 12, and the coarse sludge selected in the second cyclone 27a is introduced into the inlet pipe The mixed sludge flowing through the duct 39 can flow into the duct 11 easily because the sludge moving through the duct 11 moves fast.

The internal pressure of the duct 11 rises due to the influx of hot air so that the mixed sludge of the duct 11 has a faster moving speed and the intensity of the mixed sludge 24 colliding with the duct 11 becomes larger.

If the duct 11 has an angle, damage to each part of the duct 11 is caused by collision of sludge moving at a high speed. Therefore, an extension pipe 22 is horizontally formed at the bent portion of the duct 11, The moving sludge is consumed by the moving sludge, so that the moving sludge does not damage the duct 21.

Further, the extension pipe 22 is formed so as to be openable and closable so that it can be used for repair, cleaning, and the like.

A plurality of ejections 14 are formed in the duct 11. The mixed sludge passing through the ejection 14 is refined by the action of explosion, diffusion, collision, etc., and moisture of the mixed sludge is vaporized and dried.

The sludge obtained through the process of passing through the ejection 14 passes through the first cyclone 27a and the particle size of the mixed sludge transferred to the second cyclone 27b according to the length of the aspirator 43 As shown in Fig.

That is, if the suction device 43 is short, only the fine dust is transferred, and if the suction device 43 is long, the large particles of the mixed sludge can also be conveyed so that the suction device 43 can be adjusted have.

The mixed sludge having a large particle size among the mixed sludge that has passed through the first cyclone 27a is mixed with the mixed sludge which is introduced into the duct 11 as shown in FIG. 4 and is conveyed to the duct 11, I repeat.

The mixed dry sludge transferred from the first cyclone 27a passes through the damper 29b in powder form in the second cyclone 27b while a part of the mixed sludge is discharged and stored and a part thereof is transferred to the mixer 32, As shown in Fig.

The moisture in the airflow passing through the second cyclone 27b is collected by the dust collector 34 and mixed with the air stream is condensed in the condenser 40 to be discharged and the air stream passing through the condenser 40 is mixed with activated carbon The air stream from which the odor and the like are removed from the adsorber 36 and the fine dust, moisture, odor, and the like are removed is discharged through the blower 35.

The action of the first cyclone 27a is such that the light weight is divided into the center by the centrifugal action and the light weight is separated by the center so that the light weight or the fine dust is separated and transported according to the length of the center of the inhaler 43 .

Example

The present invention aims to improve the drying efficiency, workability and working environment of the sludge by improving the conventional drying method.

It is impossible to maintain the highest pressure in the mixing space due to the phenomenon that the high pressure of the mixing space flows backward in the conventional method as described in the detailed description, and the venturi effect at the nozzle can not be maximized.

In the conventional sludge drying method, when the hot air is introduced into the conveyance pipe, the pressure of the conveyance pipe can not be increased to the maximum due to the reverse flow phenomenon, so that the action of the ejection is remarkably decreased.

The mixed sludge 24 which is sprayed from the nozzle 13b and is granulated by the explosion, the diffusion and the impact includes the coarse sludge 25 introduced from the first cyclone 27a when moving to the conveyance pipe 12 at a high speed There is a problem that the bent portion of the duct 11 is collided and damaged while moving the duct 11 at a high speed.

The present invention improves the above problems and improves sludge drying efficiency.

 When the sludge 24 introduced into the hopper 31a moves into the mixer 32 and flows into the hopper 31a, slag dust introduced into the hopper 31b, fly ash, limestone, Or the mixed sludge in which the sludge 26 dried in the second cyclone 27b is supplied to the mixer 32 through the damper 29b and mixed is lowered in the water content at a water content of 35 to 40%.

In the embodiment of the present invention, the drying sludge introduced in the second cyclone 27b is used to mix with the sludge in the mixer.

The dried sludge introduced from the sludge 24 and the second cyclone 27b is mixed in a volume of 1: 1 so that the sludge water content becomes 35 to 40% sludge.

As described above, the mixed sludge having a moisture content of 30 to 40% is pulverized in the pulverizer 33 to be mixed in powder form.

The mixed sludge in a powder state is compressed while passing through the compressor 38, and discharged in a noodle shape or a ferret shape.

In the compressor (38), air is introduced from the blower (16a) together with the mixed sludge to improve the drying state.

The mixed sludge discharged from the compressor 38 is sent to the quantitative feeder 18 and the mixed sludge of the quantitative feeder 18 is introduced into the mixing space 19 of the feed pipe 12 in a fixed amount.

Air and hot air are supplied to the mixing space 19 of the transfer pipe 12 from the blower 16b and the hot air pipe 17 formed at the rear of the transfer pipe 12 into which the mixed sludge has flown, A high temperature and high pressure are formed in the space (19).

The hot air tube 17 is formed to accommodate a pipe extending from the blower 16b and allows air to be blown from the nozzle 13a formed at the end of the pipe extending from the blower 16b.

The nozzle 13a is located at the end of the pipe extending from the blower 16a. The nozzle 13a is configured to be retracted while being retracted to adjust the distance from the nozzle 13b so that the airflow (blowing air and hot air) passing through the nozzle 13b and the sludge can pass through the slave.

 When the high temperature, high pressure, and mixed sludge formed by the hot air and the blowing air are mixed in the mixing space 19 and passed through the nozzle 13b formed in the transfer pipe 12, the explosion, crushing, .

The inner diameter of the nozzle 13b and the inner diameter of the transfer pipe 12 can be set to 1:10 or more, thereby maximizing the effects of explosion, crushing, diffusion, and collision.

As described above, when a mixture of high temperature, high pressure and mixed sludge is formed in the mixing space 19 and passes through the nozzle 13b, the mixture passes at a high speed (subliminal), and the mixture passes through the nozzle 13b Explosion, diffusion and collision cause the sludge of the mixture to become finer and the moisture of the mixed sludge to be vaporized.

The mixed sludge 26, which has been micronized and dried in the transfer pipe 12, is moved to the duct 11.

The coarse drying sludge 25 discharged from the first cyclone 27a flows into the duct 11 through the inflow pipe 39 and moves while mixing with the mixed sludge as the dried mixed sludge moves through the duct 11 The drying rate of the sludge 24 is further increased.

The duct 11 extending from the transfer pipe 12 is lower in temperature and pressure than the mixing space 19 behind the nozzle 13b and the moving speed of the mixed sludge is lowered so that the duct 11 And the hot air of the hot air storage 28 is introduced into the duct 11. [

The booster 15 is formed in the duct 11 into which the hot air flows and the hot air tube 17 is connected to the booster 15. [

An inclined groove 23 is formed in the duct 11 in the booster 15 so as to be inclined in the direction of movement of the mixture in the duct 11 so that the hot air flowing into the booster 15 does not flow back to the duct 11 So that the moving speed of the mixed sludge is increased.

The mixed sludge that moves as described above moves while losing the impact energy while colliding with the mixed sludge filled in the extension pipe 22 when the direction of the duct is changed at the bent portion 21, prevent.

As described above, the mixed sludge that quickly moves the duct 11 passes through the sludge as it passes through the nozzle 13b when passing through the ejection 14, and at the moment when the mixed sludge passes through the nozzle 13b, The fine sludge 26 is formed by diffusion and collision, and the moisture of the mixed sludge is vaporized.

The process of pulverizing and drying the mixed sludge as it passes through the duct 11 and the ejection 14 of the duct 11 is repeatedly performed as described above. The structure of the duct 11 according to the present invention can be repeatedly provided, and the shape and structure of the duct 11 may be circular.

As shown in FIG. 8, the length of the duct 11 may be increased by rotating the duct 11 in the same manner as a spring, thereby increasing the drying time and increasing the drying efficiency.

In addition, if the duct 11 is formed in a spring shape as described above, it can be installed in a narrow space.

Also, since the number of the ejections 14 can be increased over the length of the duct 11, the drying efficiency can be increased.

The mixed sludge having passed through the plurality of ejections 14 as described above is rotated while passing through the first cyclone 27a so that the mixed sludge forms a centrifugal force in the first cyclone 27a, As shown in Fig.

Generally, the cyclone is formed to separate fine dust or the like by an inhaler 43 formed on the upper part of the cyclone.

The function of the first cyclone 27a according to the present invention is configured to adjust the length of the aspirator 43 so that it can be transferred from the fine dust to the lightweight sludge to the upper portion of the first cyclone 27a.

Experiment-1

If the suction unit 43 of the first cyclone 27a is formed to be 1/5 of the length of the first cyclone 27a, the fine dust is discharged to the suction unit 43.

Experiment-2

When the suction unit 43 of the first cyclone 27a is formed to have a length of 2/5 of the length of the cyclone 27a, fine dust and a small amount of lightweight sludge are discharged to the suction unit 43. [

Experiment -3

When the inhaler 39 of the first cyclone 27a is formed to have a length of 3/5 of the length of the cyclone 27a, fine dust, a large amount of light sludge and a small amount of heavy sludge are discharged to the inhaler 43.

The mixed sludge discharged from the first cyclone 27a is transferred to the second cyclone 27b and the second cyclone 27b is formed to discharge the fine powder so that the fine dust discharged from the second cyclone 27b is discharged to the blower 35 The condenser 40 condenses the moisture and is discharged into the water.

The airflow passing through the condenser 40 passes through the adsorber 36 formed of activated carbon, so that the odor and the like are filtered and the filtered harmless air is discharged to the atmosphere through the blower 35.

11: duct 12: conveying pipe
13: nozzle (a, b) 14: ejection
15: booster 16: blower (a, b, c)
17: Hot air tube 18: Quantitative feeder
19: mixing space 21: pipe
22: extension pipe 23: inclined groove
24; Sludge 25: Coarse sludge
26: fine sludge 27: cyclone (a, b)
28: hot air store 29: damper (a, b, c)
31: Hopper (a, b) 32: Mixer
33: crusher 34: dust collector
35: blower 36: adsorber
37: inlet pipe 38: compressor
39: inlet pipe 40: condenser
41: storage (a, b, c) 42: incineration chamber
43: inhaler

Claims (6)

The method for drying sludge such as waste water and livestock manure is characterized in that the sludge and dried sludge are introduced into the hopper 31a and 31b and conveyed to the mixer 32 and crushed in the crusher 33, And a high pressure air stream in the mixing space 19 and the sludge 24 are mixed together in the mixing chamber 19 where the hot air and the hot air are mixed, The sludge 24 is decomposed and dried in the form of particles, and the sludge 24, which has passed through the nozzle 13a as described above, Crushing, spreading, and colliding with the dried sludge 25 mixed in the first cyclone 27a and passing through the ejection 14 of the duct 11, The part of the sludge that has passed through the first cyclone 27a of the diffused sludge 24, The pulverized sludge that has passed through the second cyclone 27b is discharged and the dust that has passed through the second cyclone is collected by the dust collector 34 Wherein the moisture absorbed in the dust is dehydrated in the condenser (40) and the odor mixed in the dust is deodorized and discharged from the adsorber (36), and discharged through the venturi discharge type air flow pressure Sludge drying method. The air conditioner according to claim 1, wherein a blower (16b), a hot air duct (17) and an inlet duct (37) are connected to the mixing space (19) . The hot air duct 17 is formed so as to be capable of adjusting the distance while being reversed and to advance into the mixing space 19 so as to jet air at a high speed, and the hot air duct 17 accommodates the pipe 21 of the blower 16b, Is configured to be connected to the space (19) and configured to provide hot air in the rear of the nozzle (13a) so that the inner pressure of the mixing space (19) does not flow back to the hot air tube (17) Venturi dry type sludge drying method by venturi pressure type corresponding to water content variable. The boiler according to claim 1, wherein the hot air duct (17) for supplying hot air to the duct (11) is connected to a booster (15) containing the duct (11) And the inclined groove (23) is inclined in the moving direction so that the hot air can flow into the duct (11) without flowing back to the hot air duct (17). The venturi type Sludge Drying Method by Air Pressure. The method according to claim 1, characterized in that an extension pipe (22) is formed at the first bent portion of the duct (11) so that sludge (24, 25) moving at a high speed collides against the sludge (24, 25) , The duct (11) is prevented from being damaged by a direct collision of the sludge (24, 25) with the duct (11), and a venturi dry type sludge drying method . [3] The apparatus according to claim 1, wherein the first cyclone (27a) is configured to discharge a portion of the lightweight sludge and the weight sludge from the fine dust of the mixed sludge to the second cyclone (27b) by adjusting the length of the inhaler A sludge drying method by a venturi type air flow pressure corresponding to a water content variable. 2. The duct (11) according to claim 1, wherein the duct (11) is formed in a coil shape so that the length of the duct (11) is made longer to allow the passage time of the sludge to be longer, Is installed in a small area of a unit area where the water content of the sludge is set.

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