JP2020082067A - Sludge forming apparatus for belt dryer - Google Patents

Abstract

To provide a sludge forming apparatus for a belt drier.SOLUTION: A sludge forming apparatus for a belt dryer, comprising (a) a hopper for supplying sludge to a predetermined position, (b) a pressurizing roller having a cylindrical shape, (c) a forming roller that rotates in the direction opposite to that of the pressurizing roller, has forming grooves at fixed intervals on its outer surface, and is provided with a space inside of it where heating means is installed, (d) a motor member for rotating the pressure roller and the forming roller, (e) heating means installed in the space to generate high heat, and (f) a partition plate that prevents the sludge from falling out of the pressure roller and the forming roller at the time when the sludge is supplied between the pressure roller and the forming roller, wherein an elastic member is further provided on the surface of the forming roller to prevent an organic sludge from adhering, and formed products can be separated from the forming grooves by the elastic member when the pressure is released.SELECTED DRAWING: Figure 1a

Description

The present invention relates to a belt dryer sludge forming apparatus, and more specifically, a space between a forming roller and an elastic member is provided by installing an elastic member on the surface of a forming groove of a forming roller to maximize a releasing effect. The molded product can be easily removed from the molding groove by the heat expansion of air, and the molded roller side part of the molded product surface is in a dry state, and the part in contact with the pressure roller is molded in an undried state. By doing so, the molded product can be smoothly removed from the molding groove due to surface contraction, and the undried surface absorbs impact to protect the molded product from breaking, and even when passing through a dryer etc. The present invention relates to a sludge molding device for a belt dryer, which maintains its shape without breaking due to a sudden temperature change.

Usually, organic sludge is a residue and an inorganic substance of microorganisms generated in the water treatment process of ordinary water, industrial water, industrial wastewater, sewage and manure, and contains an organic substance as a main component, and recently, , The subject of disposal has changed to recyclable substances.

As a sludge dryer for drying such sludge, a spray dryer, a paddle dryer, an airflow dryer, a multi-stage dryer, a fluidized bed dryer, a rotary kiln (Rotary Kiln) dryer, a 3-pass (3-Pass) Drying equipment is used.

1. Quick dryers
Designed to allow the sludge particulates to contact the hot gas for a sufficient time to remove water from the sludge by milling the injected sludge in a cage mill or by spraying in the presence of the hot gas . The first step in a cage mill mixes hydrous sludge, sludge cake, conveyed dry sludge, and so on. These mixtures usually contain 50% or more of water. The hot gas and sludge are sent to a duct and a cyclone, where they are separated into steam and solid matter. Through such a process, the water content of the sludge can be reduced to 8% or less. The dried sludge can be sold or used directly as a fertilizer or soil conditioner, or it can be completely incinerated in an incinerator to recover energy for power generation.

2. Spray dryers
The spray dryer uses a high speed rotating disk capable of spraying the organic liquid sludge using centrifugal force. The organic sludge is sprayed as fine particles using the centrifugal force of a high speed disc to maximize the surface area, thereby facilitating the drying and spraying from the upper part. Here, water turns into hot steam. If the design does not clog the nozzle, then a jet nozzle can also be used.

3. Rotary dryers
Among organic sludges, it is a dryer utilized for drying sewage sludge or urban solids drying and high-capacity organic sludge that require drying at high temperature. The direct heat dryer is a system in which high-temperature combustion gas is directly supplied to the dryer, and the indirect heat dryer is a system in which heated steam is transferred from a central chamber to a stirrer or an external cylinder to be dried. As the fuel, coal, oil gas, municipal solid waste, dried sludge and the like can be used.

4. Multi-stage oven dryer It is used to burn and dry sludge dehydrated by a mechanical device, and it is dried by continuously passing fine sludge in preheated air.

5. Multi-Stage Evaporator The main steps of this process, also known as "Carver-Greenfield Process", are oil agitation, multi-step evaporation, oil and solids separation, condensed oil separation and the like. In the oil mixing stage, the oil and sludge can be mixed to facilitate transportation and reduce scaling and corrosion. Since water has a lower boiling point than oil, water is first evaporated off, leaving oil and dry sludge.

In addition to such conventional drying method, in recent years, as a core technology that maximizes the drying efficiency by crushing and floating the dried material to maximize the contact area with the hot air, a system for drying the levitation particles by the hot air in the collision airflow has been proposed. Although developed, this system is recognized as a new technology that has never been reported as a domestic or international drying technology.

In the case of sewage/wastewater sludge, the phenomenon of solidification and solidification as a lump occurs in the section with a water content of 60 to 80 wt%, but for effective drying, sludge is continuously crushed and floated. We developed and applied the technology to increase the contact area with hot air, and allowed the wet air generated in the direct dryer and indirect dryer to pass through the radiant heat section of 500 to 800°C for 3 to 5 seconds to be included in the wet air. We developed and applied the technology to reduce the bad odor.

In addition to this method, a technology has also been developed to prevent the sludge from agglomerating by making the space containing sludge a vacuum state and allowing the water to evaporate at a low temperature, in an attempt to minimize the energy used to evaporate the water. The technology to do so has already been developed.

However, the biggest drawback of all of these techniques is that in the case of sludge, it is not well formed into a certain shape, that is, a pellet-like shape in the section with a water content of 60 to 80 wt %, so mixing an auxiliary coagulant or a forming agent There are many. In addition, the phenomenon of re-agglomeration and solidification occurs in the lump, but when such a phenomenon occurs, it is difficult to remove the moisture in the inside, even though the outside is dry because the surface area of the sludge is large. Therefore, the drying efficiency is reduced. These conventional techniques have a problem in that a large amount of energy is used, the efficiency is low, and the drying time is long because a solution to such a problem is not suitable.

The inflow part of the conventional sludge dryer is composed of a normal circular tube, and has a structure in which the material to be dried is introduced into the dryer by inserting and inserting the object to be dried into the inflow part. At the inflow part of such a conventional sludge dryer, the material to be dried is not smoothly charged, and due to the viscosity of the material to be dried, a large amount of power is absolutely necessary at the time of charging, and the charging speed is weak. Since the material to be dried is loaded on the inflow part of the dryer and the inflow part is clogged, there is a problem that the operation of the dryer is stopped.

In addition, the mixing sludge in the inflow part, that is, the rate of feeding the material to be dried decreases in accordance with a change in the pressure in the dryer or a change in the water content of the sludge and stays in the inflow part. There is a problem that the sludge drying process occurs frequently and is not smooth.

In order to solve such a conventional problem, the "upper press-fitting spherical thermoforming machine" of Patent Document 1 has been proposed. This "top press-fitting spherical thermoforming machine" is a scraper that inserts an object to be processed into a molding groove, molds it with a pressure roller, and pulls out a part of the object drawn into the molding groove from the molding groove. It has a structure to cut with.

The dryer of Patent Document 1 described above has a problem that the molding groove is made of metal and easily sticks to the surface of the roller heated at a high temperature. When it comes out of the molding groove, the scraper is used to cut only the portion that has come out of the molding groove.The problem that the dried object to be processed is thin, so it breaks when dropped, Although it is thin, the drying time is fast, but the problem that the dried powder is scattered and the worker inhales dust, the defect that it comes out between the drying nets of the belt dryer, and the length that it comes out from the molding groove are different and uniform. There is a problem that simple molding is impossible.

Published Patent Publication No. 2010-181077 Korean Published Patent No. 2010-83509

The present invention has been made in order to solve such conventional problems all at once, and an object thereof is to install an elastic member on the surface of the molding groove of the molding roller to maximize the releasing effect, and to improve the surface of the molding roller. After the sludge is prevented from sticking to the molding groove and the sludge drawn into the molding groove is pressurized, a part of the air layer in the space between the elastic member and the molding roller comes out of the molding groove due to heating, Depending on the rotation angle, the sludge molding device for a belt dryer is designed so that it can be removed from the molding groove by its own weight, and the molded product that is not removed can be easily removed from the molding groove by using a blade. To provide.

Another object of the present invention is to form a part of the surface of the molding on the molding roller side in a dry state and a part of the pressure roller side in an undried state to smoothly form a molding groove due to surface contraction of the molding. The belt of the belt dryer is removed from the belt, and the undried surface absorbs impact to protect the molded article from breaking and maintains its shape without breaking even when passing through a dryer. An object of the present invention is to provide a sludge molding device for a belt dryer, which manufactures a molded product so as not to slip out of the net.

In the sludge forming apparatus for a belt dryer, the above-mentioned purpose is to supply a sludge to a certain position with a hopper, a pressure roller having a cylindrical shape, while rotating in a direction opposite to the pressure roller. A molding roller having a molding groove on the outer surface at regular intervals and having a space portion in which a heating means is installed, a motor member for rotating the pressure roller and the molding roller, and a space member provided in the space portion. A heating means for generating high heat, and a partition plate for preventing spillage of the pressure roller and the molding roller from falling off when sludge is supplied between the pressure roller and the molding roller. An elastic member is further provided on the surface of the molding roller to prevent the organic sludge from adhering, and when the pressure is released, the elastic member separates the molded product from the molding groove. It is achieved by a sludge forming device for a belt dryer, which is characterized in that:

The molding groove may be further provided with a protrusion for easily removing the molded product.

The pressure roller is provided with a low temperature supply device for supplying a low temperature, pressurizes the molded product, and prevents one surface of the molded product from drying.

A blade is further provided for completely withdrawing and removing a molded product, a part of which has been removed from the molding groove by the elastic member.

The surface temperature of the heating means is 120 to 150°C, and the surface temperature of the pressure roller is 5 to 30°C.

The forming roller is further provided with a drain hole for discharging condensed water.

As described above, in the present invention, the elastic member is provided on the surface of the molding groove to maximize the releasing effect, and the molded product is easily removed from the molding groove by heating the air between the elastic member and the molding roller. As a result, part of the surface of the molded product is molded in a dry state and part is molded in a non-dried state. It has a useful effect that it is protected from being damaged and maintains its shape without breaking due to a sudden temperature change even when passing through a dryer or the like.

It is a front illustration which shows the structure of the sludge shaping|molding apparatus for belt dryers to which the technique of this invention was applied. It is a plane illustration showing the structure of the sludge forming device for belt dryers to which the technique of the present invention is applied. It is sectional drawing which shows the structure of the shaping roller which is the technical summary of this invention. FIG. 6 is an enlarged view showing the operation of a molded product and an elastic member drawn into a molding groove, which is the technical gist of the present invention. It is sectional drawing which shows the other structure of the shaping|molding roller which is the technical summary of this invention.

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

1a and 1b are exemplary views showing the structure of a sludge forming apparatus for a dryer to which the technique of the present invention is applied. As shown in the figure, in a sludge forming device 1 for a belt dryer, which is installed at the tip of a belt type sludge drying device 100 and supplies sludge to the drying device 100, the sludge is temporarily stored and a certain amount is discharged downward. At the lower part of the hopper 10, a cylindrical pressure roller 20 and a forming roller 30 that rotates in a direction opposite to the pressure roller 20 and has an elastic member 60 attached to its surface are installed.

When the sludge contained in the hopper 10 is supplied between a pair of pressure roller 20 and the forming roller 30, the sludge passes between the pressure roller 20 and the forming roller 30, Are molded to have a constant shape and size.

As shown in FIG. 2, the forming roller 30 rotates in a direction opposite to the pressing roller 20, has forming grooves 31 on its outer surface at regular intervals, and a heating means 40 is installed in an inner space 32. When the high temperature heating steam is supplied to the space 32 of the forming roller 30 through the heating means 40, condensed water is generated in the space 32 and is installed inside the forming roller 30. The heating means 40 is axially provided by the bearing means 50, and the forming roller 30 is further provided with a drain hole 51, so that condensed water is discharged.

The end of the heating means 40 installed in the space inside the forming roller 30 is bent downward. The reason is that when high temperature heat is supplied to the rotating forming roller 30, condensed water is generated in the space 32, and the condensed water is prevented from flowing backward and closing the heating means 40 by the rotating force of the forming roller 30. This is because

On the other hand, the temperature of the heating means 40 is in the range of 120 to 150° C., and the elastic member 60 is further attached to the surface of the forming roller 30 to prevent sludge from adhering and the formed product formed in the forming groove 31. Push out.

A blade 70 is provided on one side of the molding roller 30 to extract a molded product that has not come out of the molding groove 31. The structure includes a motor member 80 that drives the pressure roller 20 and the molding roller 30. The unexplained reference numeral 200 is a gear member that transmits the rotational force of the motor member 80.

Regarding the shape of the molding groove 31 or the molded product, the diameter of the surface in contact with the pressure roller 20 is wide, and the diameter of the portion in contact with the molding roller 30 is small. The shape of the molding groove 31 is preferably a hemisphere, a quadrangle, or a triangle.

On the other hand, as shown in FIG. 3, the molding groove 31 may be further provided with an expansion protrusion 66 for easy separation of the molded product. The expansion protrusion 66 improves the elastic force of the elastic member 60. When the molding is pressed by the pressure roller 20, the expansion projection 66 is simultaneously pressed with the molding, and when the pressure is released, the molding is molded into a groove. By further increasing the pushing force from 31 to the outward direction, the molded product can easily come out of the molding groove. In addition, the protrusion between the molding roller and the elastic member promotes smoother removal by expansion due to air heating.

FIG. 4 shows another structure of the forming roller 30. As shown in the drawing, a space recess 33 may be further provided at the bottom of the molding groove. The space recess is a spare space that facilitates compression while preventing the elastic member 60 and the expansion protrusion 66 from being damaged when the elastic member 60 and the expansion protrusion 66 are compressed.

When a part of the elastic member 60 is drawn into the space concave portion 33 during compression and the compressive force is released, the elastic member 60 is restored and pushed by the elastic force so that the molded product can be easily pulled out from the molding groove.

The operation of the sludge forming apparatus 1 for a belt dryer of the present invention having the above-described structure is such that when the motor 80 drives the rotational force to operate the gear member 200, the gear member 200 is provided with a pressure roller having a shaft. 20 and the forming roller 30 are rotated.

When the pressure roller 20 and the molding roller 30 rotate, sludge having a high water content and a high viscosity is supplied between the pressure roller 20 and the molding roller 30 through the hopper 10, and the sludge of the pressure roller 20 and the molding roller 30 is supplied. The sludge is supplied between the pressure roller 20 and the forming roller 30 while being prevented from spilling out of the pressure roller 20 and the forming roller 30 by the partition plate 90 installed on the upper portion thereof.

When the sludge supplied between the pressure roller 20 and the forming roller 30 passes between the rotating pressure roller 20 and the forming roller 30, it has a certain size and shape due to the forming groove 31 of the forming roller 30. Molded to have.

The forming groove 31 may be selected from a semi-circular cross-section and a quadrangular cross-section, and when the sludge flows into the forming groove 31, the pressure roller 20 causes the sludge to move toward the inside of the forming groove 31. Pressurized.

The pressure roller 20 presses the sludge toward the inside of the molding groove 31 and drying occurs on the surface of the molding groove 31, but in this case, the water content on the surface of the molding on the molding roller 30 side evaporates. , The surface becomes hard and hard due to shrinkage and decrease in surface tension. However, the surface of the molded product that is pressed by the pressing roller 20 having a surface temperature of 5 to 30° C. is maintained in an undried state and the surface strength is maintained soft.

Accordingly, the pressure roller 20 and the molding roller 30 are pressed together to squeeze out the water content of the sludge first to lower the water content, and the inside of the molding roller 30 having the molding groove 31 is heated by the heating means 40 for supplying high-temperature heat. Secondly, the surface of the sludge that has been heated and has been drawn into the molding groove 31 is dried to remove the water.

The temperature of the heating means 40 is in the range of 120 to 150°C. If the temperature of the heating means is 120° C. or lower, there is a problem that the drying speed is slow and the surface is not dried, and there is a problem that the molding efficiency is reduced. If the temperature of the heating means is 150° C. or higher, the molding roller is used. There is a safety problem that internal pressure is generated in the inside of 30, that is, the space 32, and a problem that heat conduction is reduced due to the thickness of the roller that can withstand the internal pressure.

On the other hand, the reason for lowering the surface temperature of the pressure roller 20 is to obtain an undried surface, and the above-mentioned undried surface is heated to a high temperature and heat is transferred from the dried surface to the inside of the molded article. This is because it is transmitted and causes pressure rise and cracks, so that the internal heat and moisture are discharged to the outside at the same time, and the molded product is also prevented from cracking due to an impact when leaving the molding groove 31. ..

An elastic member 60 is installed on the surface of the forming roller 30 to prevent sludge from sticking to the surface of the forming roller 30. For the elastic member 60, it is preferable to use either a synthetic resin material or a rubber material having excellent heat resistance and elasticity.

The molded product molded in the molding groove 31 is dropped by its own weight in accordance with the rotation angle of the molding roller 30 and is dropped and supplied to a transfer device for transferring to the sludge drying device 100. At this time, the molded product that has not come out of the molding groove 31 is caught by the blade 70 and comes out.

As shown in FIG. 3, the molding groove 31 may be further provided with an expansion protrusion 66 for easy release of the molded product. The expansion protrusion 66 improves the elastic force of the elastic member 60. When the molding is pressed by the pressure roller 20, the expansion projection 66 is simultaneously pressed with the molding, and when the pressure is released, the molding is molded into a groove. By further increasing the pushing force from 31 to the outward direction, the molded product can easily come out of the molding groove.

FIG. 4 shows another structure of the forming roller 30. As shown in the drawing, a space recess 33 may be further provided at the bottom of the molding groove. The space concave portion is a spare space that facilitates compression while preventing the elastic member 60 and the expansion protrusion 66 from being damaged when the elastic member 60 and the expansion protrusion 66 are compressed. When a part of the elastic member 60 is pulled into the space concave portion 33 during compression and the compressive force is released, the elastic member 60 is restored and the molded product is pushed by the elastic force so as to easily come out from the molding groove.

According to the present invention, before supplying the sludge to the dryer, the organic sludge is shaped to have a certain size and shape to maximize the contact with dry air and maximize the drying efficiency. It is possible and easy to move and handle due to its small size and small pellet structure. In addition, it has a long drive life because it has a small drive part and a simple structure with few failures, and it is driven with less power than the drying capacity. Since it is possible to adjust the heating amount and rotation speed of the forming roller, the supply amount of sludge forming for a belt dryer can be adjusted. First, since the surface of the forming roller is dried, it is not necessary to separately process into pellets. It is a useful invention with certain convenience.

1 Sludge Forming Device 10 Hopper 20 Pressurizing Roller 30 Forming Roller 31 Forming Groove 33 Space Recess 40 Heating Means 60 Elastic Member 66 Expansion Protrusion 70 Blade

Claims (5)

A sludge forming device for a belt dryer,
A hopper that supplies sludge to a certain position,
A pressure roller having a cylindrical shape,
While rotating in a direction opposite to the pressure roller, having a molding groove at a constant interval on the outer surface, a molding roller having a space portion inside which the heating means is installed,
A motor member for rotating the pressure roller and the forming roller,
A heating unit installed in the space, which generates high heat,
When sludge is supplied between the pressure roller and the molding roller, the pressure roller and a partition plate for preventing the pressure roller from spilling out of the molding roller are provided,
An elastic member is further provided on the surface of the forming roller to prevent the organic sludge from adhering, and the formed member is separated from the forming groove by the elastic member when the pressure is released. Sludge forming equipment for belt dryers. The sludge molding device for a belt dryer according to claim 1, wherein the molding groove is further provided with a protrusion for easily releasing the molded product. The belt according to claim 1, wherein the pressure roller is provided with a low temperature supply device for supplying a low temperature, pressurizes the molded product, and prevents a partial surface of the molded product from drying. Sludge forming device for dryer. The sludge molding apparatus for a belt dryer according to claim 1, further comprising a blade for completely withdrawing and removing a molded product, a part of which has been pulled out from the molding groove by the elastic member. The sludge molding device for a belt dryer according to claim 1, wherein a surface temperature of the heating unit is 120 to 150°C and a surface temperature of the pressure roller is 5 to 30°C.