KR20090032602A - Venturi Eject Type Sludge Dryer Using Air Flow - Google Patents

Abstract

The present invention is a slag dust of steelmaking steel in the mixer with a water content of 60 to 85% of the sludge introduced into the hopper to dry and recycle sludge such as sewage, wastewater and livestock manure, coal ash, limestone, lime powder of power plants The mixture of high-molecular sludge and low-molecular weight sludge to reduce the moisture content by 30 ~ 45% by mixing in a mixer together with the sawdust and the already dried sludge powder in the piping of the venturi ejection type extruder. Sludge mixture is dispersed, pulverized and dried by high temperature in the process of passing through the venturi ejection type compression ejector at a high speed with a hot air of 200 ~ 400 ℃ provided by the water content of the sludge mixture. It is to provide an energy-saving sludge drying method that is dried up to 15%.

Description

{The method that drying sludge of the type of ventury ejector using difference between air current and atmospheric pressure}

The present invention ha. Sludge with a water content of 60 to 85% from waste water treatment is mixed in a mixer with already dried sludge or slag dust from steelmaking, coal ash, limestone, lime, sawdust and already dried sludge from power plants To reduce the water content to 30 ~ 45%, the mixture of high water content sludge and low water content sludge is mixed in the piping of venturi ejection type extrusion device with 200 ~ 400 ℃ hot air provided by compressed air and hot air. When passing through four or more compressed air jets of the venturi ejection type, the mixture is finely pulverized by the difference in air pressure, and the mixture is finely powdered and continuously dried at the surface of the mixture particles of the sludge. Energy to dry the fine powder to less than 15% of water content by drying it by forming a new moisture surface on the surface and drying it Commute relates to a sludge drying method.

Conventionally, since the sludge is dried in a state of high moisture content, there is a big problem in the processing cost of consuming a large amount of fuel during drying, and there is a problem of environmental pollution due to odor during drying, and a large place is required for installation. There is a problem that places are limited.

The present invention ha. Sludge with 60% to 85% water content from wastewater treatment, slag dust of steelmaking steel with the same properties as calcium oxide (CaO), a drying agent as a water scavenger, coal ash, limestone, limestone from power plants The sludge mixture fine powder, already dried in sawdust and dryer, is mixed in the mixer, so that the water content of sludge falls to 30 ~ 45%. The dried sludge mixture is passed through a compressed jet machine several times, As the sludge mixture passes through the duct drying chamber, the sludge mixture is dispersed, pulverized and dried repeatedly to dry the surface of the newly formed fine particles, thereby reducing the water content of the sludge mixture to less than 15%, reducing the drying cost and preventing the emission of harmful gases due to high heat. By ha. The aim is to provide a method for the recycling of sludge from wastewater treatment plants.

The present invention mixes sludge with high moisture content and sludge with low moisture content to lower the primary sludge moisture content.

The primary sludge having a low water content is passed through a compressed jet machine formed in a venturi ejection type at high speed, and is dispersed, pulverized, and dried by a high air pressure at each time it passes through the compressed jet machine.

Ha. The water content of sludge is supplied by mixing and mixing the sludge dust of steelmaking, coal ash, limestone, lime powder, sawdust and dust collector of the steelmaking plant in the mixer containing the sludge with water content of 60 ~ 85% generated from wastewater treatment. Drop to 30-45%.

As described above, when the sludge mixture having a water content dropped to 30 to 45% is passed through the pipe and passed through the compressed jet formed in the pipe while being conveyed with compressed air, dispersion, pulverization, and drying are formed into fine powders. The fine powder, which is dispersed, pulverized, and dried at high temperature, provides hot air when passing through a ring duct in which at least two compression ejectors are formed, so that the sludge mixture, which is a fine powder at a high temperature (200 to 400 ° C.), is dispersed, pulverized and dried. By repeating and continuously removing the surface moisture of the fine powder, the particles of the sludge mixture are refined and the drying efficiency is increased to lower the water content of the sludge to less than 15%.

The sludge drying system according to the present invention mixes sludge with a water content of 60 to 85%, slag dust of steelmaking, biosolids such as coal ash, limestone, lime powder and sawdust of a power plant, and has a water content of 30 to 45%. Dropping and re-injecting it into the duct drying chamber formed by venturi ejection type with hot air of high temperature (200 ~ 400 ℃) to form dry sludge powder with moisture content less than 15%, thereby recycling sludge. It has the effect of reducing the cost required for the treatment of sludge, the effect of minimizing the amount of sludge, and the device is simple, so it can be installed even in a narrow place. Pollution can be prevented, it is easy to operate because it is easy to operate, and the construction cost is low, and the combustion and treated sludge by high heat Since it can be recycled, it is effective to reduce environmental pollution.

The present invention is characterized by quantitatively mixing the sludge with a high moisture content and a sludge with a low moisture content to form a sludge mixture having a low moisture content.

The present invention is characterized in that the sludge mixture is dispersed, pulverized and dried at a high temperature by the difference in the airflow air pressure generated when the mixture passes at a high speed through a compression jet using a venturi ejection type.

The present invention is to reduce the water content of the sludge generated in the sewage and wastewater treatment process to environmentally friendly standards, and 60-85% of the water-containing sludge is slag dust of steelmaking, coal of power plants to reduce the installation and cost of equipment. Biosolids such as ash, limestone, stone powder and sawdust are mixed in the mixer so that the mixture with reduced sludge moisture content of 30-45% is transported through the pipe where the compression jet device is formed and dispersed and ejected at high temperature. And the high temperature of the incinerator when it is transferred to the ring duct is supplied to the mixture to be ejected using a hot air blower to become a high temperature, the dispersion and ejected mixture is dispersed and ejected at high temperature and high pressure in the ring duct while the sludge mixture It is characterized by being formed of less than% fine powder and configured to be recycled.

Figure 1 shows the overall configuration of the present invention.

Figure 2 shows in detail the compressed jet machine according to the present invention.

Ha. The hopper 1 is formed as shown in FIG. 1 which first introduces sludge generated in the wastewater treatment process.

Screw conveyor (2a) for quantitatively conveying the sludge flowing into the hopper (1) is connected to the mixer (3) is formed so that the sludge flows into the mixer in a quantitative manner.

A reservoir 19 is formed close to the hopper 1 in which biosolids composed of slag dust of steelmaking steel, coal ash of a power plant, limestone, lime powder and sawdust and the like are stored.

A transfer conveyor 16c, which is connected to the biosolids reservoir 19 and quantitatively transfers the biosolids, is connected to the mixer 3 so that the biosolids are quantitatively supplied to the mixer 3 Formed.

A reservoir 17 is formed close to the biosolids reservoir 19 to store fine sludge powder supplied from the cyclone dust collector 12.

Sludge quantitatively fed from the screw conveyor 2a and biosolids already transferred using the transfer conveyor 16c from the cyclone dust collector 12 and already dried biosolids quantitatively transferred from the conveying conveyor 16b. (biosolids) are configured to mix in the mixer (3).

As described above, the biosolids stored in the sludge and the reservoir 19 and the biosolids of the reservoir 17 transferred and stored in the dust collector 12 are mixed to form a mixture having a moisture content of 60 to 65%.

A screw conveyor 2b is formed in association with the mixer 3 containing the mixture having a water content of 30% to 45%, and the screw conveyor 2b is formed to be connected to the pipe 7 to convey the mixture.

At the rear of the pipe 7, a compression fan 6 for providing high pressure to the pipe 7 is formed.

The pipe 7 is provided with a compression jet 4a for compression jet of the mixture conveyed from the screw conveyor 2b and the compressed air provided from the fan 6.

A pipe 7 for conveying the mixture ejected at high pressure from the compression ejector 4a is connected to the ring duct drying chamber 8.

The compressed pipe 4a front pipe 7 is formed to provide high pressure heat from the hot air blower 9a.

Ring duct drying chamber (8) connected to the pipe (7) while drying and conveying the mixture ejected from the pipe (7) forms a ring in a cylindrical shape and the duct (8) has at least two or more compression ejectors (4b, 4c, 4d) are formed.

As shown in FIG. 1, a compression nozzle 5 is formed in front of the compression jet 4d, and a discharge pipe 11 through which the dried mixture powder is discharged is discharged between the compression jet 4d and the extrusion nozzle 5. Formed.

The dust collector 12 is formed so that the mixture fine powder dried in the ring duct drying chamber 8 collects.

The mixed powder discharged to the discharge pipe 11 is transferred to the sorting duct 22 of the dust collector 12, and the sludge mixed powder conveyed is classified into large particles and small particles, and the small particles are separated into the dust collector 12. The falling large particles are formed to be separately sorted by the exhaust fan 23.

The fine powder of the mixture collected in the dust collector 12 is formed to be loaded on the dust collection hoppers 13a and 13b formed in the lower part of the dust collector 12.

The fine powder of the dust collection hopper 13a is formed to be stored in the dry powder storage 17 using the conveying conveyor 16a in a fixed amount by the control valve 15a.

The fine powder of the dust collection hopper 13b is formed to be discharged to the discharge port 21 using the control valve 15b and the discharge conveyor 14.

Sludge with a water content of 60 to 85% is introduced into the hopper 1 and is quantitatively supplied to the mixer 3 through a screw conveyor 2a, and the slag dust of steelmaking steel, coal ash, limestone, lime powder, sawdust, etc. The dried biosolids are stored in the biosolids reservoir 19 and quantitatively supplied to the mixer 3 through the transfer conveyor 16c, and a portion of the already dried sludge dry powder is stored in the dry matter reservoir 17 A fixed quantity is supplied to the mixer 3 via the conveying conveyor 16b.

As mentioned above, when the slag dust of steelmaking, the coal ash of the power plant, the limestone, the lime powder, the sawdust and the already-dried sludge mixture powder, and the sludge with moisture content 60-85% are mixed in the mixer (3), the sludge mixture has the water content of 30 It drops to ~ 45%.

The sludge mixture connected and mixed with the mixer 3 is transferred to the pipe 7 through a screw conveyor 2b, and the compressed air is operated by the operation of the compression fan 6 at the rear of the pipe 7. Inflow).

The sludge mixture conveyed to the pipe 7 passes through the compressed jet device 4a like compressed air.

When the air is compressed, the temperature rises, so that the sludge mixture is at a high temperature and high pressure before passing through the compression jet 4a. When the sludge mixture is ejected, the sludge mixture is ejected at high speed, and the sludge mixture is dispersed and pulverized into small particles. When the sludge mixture is pulverized into small particles, moisture forms on the surface of the particles, resulting in rapid drying of the particles.

When the sludge mixture pulverized as described above flows into the ring duct drying chamber 8, hot air flows from the hot air blower 9a into the pipe 7 in front of the compressed air blower 4a at high speed so as to obtain the sludge mixture particles. It achieves rapid drying and burns harmful gases generated during drying.

The sludge mixture in the particulate state is introduced into the ring duct drying chamber 8 and passed through at least two or more compression jet machines 4b, 4c, and 4d, and the hot air blower in the ring duct drying chamber 8 as shown in FIG. Hot air of (9b) is injected at a high speed to raise the temperature of the ring duct drying chamber (8) to dry the particles of the sludge mixture.

The sludge mixture moving through the ring duct drying chamber 8 continues to move at high speed while repeatedly dispersing, pulverizing and drying, and the moving sludge mixture passes through the nozzle 5 to become high pressure and high temperature again and the nozzle 5 is moved. Will pass.

The sludge mixture moving as described above is slowed before moving through the nozzle 5 so that the fine particle sludge mixture powder is discharged through the discharge pipe 11 and the sludge mixture moving at a high speed in the ring duct drying chamber 8. The larger the particles in the powder, the larger the moving speed than the fine powder, so that most of the large particles pass through the nozzle 5 and move with the new sludge mixture powder to be finely divided by repeated dispersion grinding and drying.

The fine powder passing through the discharge pipe 11 is 15% moisture content is accommodated in the cyclone dust collector (12).

When the sludge mixture fine powder is introduced into the dust collector 12, the harmful gas is also introduced, so that the harmful gas is neutralized in the neutralizer 22 installed in the dust collector 12.

The sludge mixture fine powder accommodated in the dust collector 8 is stored in two dust collecting hoppers 13a and 13b so that some of the fine powder is transferred to the conveying conveyor 16a through the dust collecting hopper 13a and stored in the reservoir 17 and is collected. The fine powder stored in the hopper 13b is discharged to the discharge port 21 through the discharge conveyor 14.

Example

The present invention improves the conventional drying method that is expensive to dry the sludge with high water content, and can be dried at a low fuel cost, and it is eco-friendly and the equipment is simple because the harmful gas is burned by hot air in the drying process. Installation is possible at the place.

When it flows into the hopper 1 which becomes the sludge of 60 to 85% of water content, it transfers to the mixer 3 by the screw conveyor 2a.

The biosolid powder previously stored in the reservoir 19 is transferred to the mixer 3 using the transfer conveyor 16c.

The powder of the sludge fine powder reservoir 17 dried by the operation is transferred to the mixer 3 using the conveying conveyor 16b.

As described above, when the quantitative sludge and the quantitative biosolid powder and the quantitative dried sludge powder are accommodated in the mixer 3, the mixture is stirred and mixed.

By mixing as described above, sludge having a water content of 60 to 85% becomes sludge having a water content of 30 to 45%.

After the mixing is completed in the mixer 3, the sludge mixture of the mixer 3 is transferred to the pipe 7 using a screw conveyor 2b.

The fan 6 is operated at the rear of the pipe 7 to form a high pressure in the pipe 7.

When the sludge mixture is introduced into the pipe 7 as described above, the sludge mixture is quickly transferred by the operation of the high-compression fan 6 operating in the rear.

The sludge mixture conveyed through the pipe 7 passes through a venturi ejection type compression ejector 4a as shown in FIG. 1.

The venturi ejection type compression ejector 4a has a wide inlet and outlet and a narrow shape at the center thereof so that high pressure is formed at the inlet side when the fluid passes through the compression ejector 4a. The temperature also rises and high pressure is formed in the narrow inner diameter.

As described above, the sludge mixture before passing through the compressed jet device 4a becomes a high pressure and high temperature state, and thus becomes an ecological which facilitates drying.

In the implementation, since the sludge flows into the pipe 7 at a high speed from the nozzle 5 and can form a high pressure in front of the compression jet 4b, the omission of the compression jet 4a has no significant difference in achieving the present invention. .

As the sludge mixture passes through the center of the compressed jetting machine 4a in the dry state as described above, the pressure suddenly drops, so that the crushing phenomenon occurs due to the collision between particles at the moment when the sludge mixture is expanded and dispersed. .

Since the dispersion and pulverization occur continuously, the particles of the sludge mixture are continuously pulverized into small particles, the number of particles increases, and the surface of the particles increases as a result of the increase of the particles. Drying is faster overall.

As described above, the piping 7 passing through the compressed jet 4a is not only facilitated to dry the sludge mixture in which high heat (200-400 ° C.) is continuously introduced and dispersed at high speed by the hot air fans 9a and 9b. It will form a high pressure.

The sludge mixture conveyed in the form of particles while being dispersed and pulverized at the high pressure and high temperature is transferred to the ring duct drying chamber 8.

As shown in FIG. 1, the ring duct drying chamber 8 has at least three or more compression ejectors 4b, 4c, and 4d formed therein and is heated at high temperatures (200 to 400 ° C.) by the hot air fans 9a and 9b. The ring duct drying chamber (8) flows into the ring duct drying chamber (8) to form a high temperature and a high pressure, and the sludge mixture moves the ring duct drying chamber (8) in the above state, and continuously performs a process such as dispersion grinding. Will repeat.

The sludge mixture forms fine powder particles while repeating the above working conditions and forms a water content of 15%.

 Since the sludge mixture dried as described above passes through the nozzle 5 and a high temperature and high pressure is formed before passing through the nozzle 5, a part of the sludge mixture moving to the discharge pipe 11 formed behind the nozzle 5 is discharged. Done.

That is, part of the sludge mixture that moves the ring duct drying chamber 8 is discharged to the discharge pipe 11, and part of the sludge mixture is dispersed and pulverized while the ring duct drying chamber 8 is moved.

The sludge mixture fine powder conveyed through the discharge pipe 11 is conveyed to the fractionation duct 22.

Small particles of the sludge mixture powder transferred to the fractionation duct 22 are dropped and stored in the dust collector 12, and larger particles and foreign matters are separated and discharged separately by the discharge fan 23.

The sludge mixture fine powder loaded on the dust collector 12 is accommodated in two dust collection hoppers 13a and 13.

The fine powder of the dust collection hopper 13a is quantitatively stored by the control valve 15a in the reservoir 17 using the conveying conveyor 16a and the fine powder of the dust collection hopper 13b is quantified by the control valve 15b. By using the discharge conveyor 14 to the discharge port 21 is discharged.

1 is an overall configuration diagram of the present invention.

Figure 2 is a detailed view of the compression ejector according to the present invention

*** Explanation of symbols for the main parts of the drawing ***

1: Hopper 2: Screw Conveyor (a, b)

3: mixer 4: compression jet (a, b, c)

5: nozzle 6: air compression fan

7 Piping 8: Ring Duct Drying Room

9: hot air fans (a, b) 11: exhaust pipe

12 cyclone dust collector 13 dust collector hopper (a, b)

14: discharge conveyor 15: control valve (a, b)

16: conveying conveyor (a, b, c) 17: dry powder storage

19: Bio Solid Storage 21: Outlet

22: classification duct 23: exhaust fan

Claims (4)

The water content is 60 to 85%. A hopper (1) into which wastewater sludge flows, a slag dust from steelmaking, a biosolids powder reservoir (19) consisting of coal ash, limestone, lime powder and sawdust powder from a power plant, and a reservoir containing dried sludge dry powder The mixer 3 which is conveyed and mixed by the screw conveyor 2a and the conveying conveyors 16b and 16c by the fixed quantity in (17), and the screw conveyor 2b which conveys the sludge mixture mixed by the said mixer 3 in fixed quantity. ) And a pipe (7) into which the sludge mixture conveyed from the screw conveyor (2b) is introduced and transported, an air compression fan (6) providing high pressure air from the rear of the pipe (7), and a pipe (7). Hot air fans 9a and 9b for providing hot air at a high temperature (200 to 400 ° C.) in front of it, a ring duct drying chamber 8 into which a sludge mixture, high pressure air pressure and hot air are mixed and introduced, and the ring duct drying room 8 Sludge mixture powder dried in The dust collector 12 and the sludge mixture powder of the dust collector 12 are composed of dust collector hoppers 13a and 13b capable of discharging the sludge mixture powder into the reservoir 17 and the discharge port 21. A venturi ejection type sludge drying method using air flow air pressure difference, characterized in that the drying. Compression ejectors 4a, 4b, 4c, and 4d are formed in the pipe 7 and the ring duct drying chamber 8 to compress and expand the sludge mixture conveyed at a high temperature (200 to 400 ° C.) and high pressure. A method for drying a sludge of a venturi ejection type using a difference in air pressure, characterized in that the sludge is dispersed, pulverized and dried repeatedly. 3. Compressor ejectors (4a, 4b, 4c, 4d) are formed in a venturi ejection type with a wide inlet and outlet and a narrow central venturi ejection type, the high pressure at the inlet side when the moving sludge mixture passes. A venturi ejection type sludge drying method using an airflow air pressure difference, characterized in that the high temperature is formed and expands when it is ejected from the outlet side to become a low pressure state to be dispersed and pulverized into small particles to facilitate high temperature drying. The nozzle (5) of the ring duct drying chamber (8) has a high pressure formed at a rear side thereof, and is discharged to the front of the nozzle (5). Venturi ejection type sludge drying method using the air flow air pressure difference, characterized in that the discharged to the discharge pipe 11 formed in the rear of the nozzle (5) in a fine powder state.

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