KR20080029376A - Apparatus to dry sludge using how-wire - Google Patents

Abstract

An equipment for drying sludge by a heating wire is provided to remove water contained in the sludge by supplying energy using electric heat to water-containing sludge, thereby increasing temperature of the sludge. An equipment for drying sludge by a heating wire comprises: a screw conveyor rotated by a motor(4) to transfer sludge; a hopper(5) which is installed at a starting point of the screw conveyor, and through which sludge is injected into the screw conveyor; a discharge port(7) installed at an end part of the screw conveyor to discharge dry cake; a steam outlet(8) for discharging steam discharged in the sludge drying process from the inside of the screw conveyor to the outside thereof; and a heating wire(1a) installed on an outer part of a pipe surrounding the screw conveyor. The steam outlet discharges steam to the outside by the rotation of a fan. The heating wire is wound around the pipe by a rotation type winding method, a lattice type winding method, or a combination thereof.

Description

Apparatus to Dry Sludge Using How-Wire}

1 is a conceptual diagram of water heating using a hot wire according to the present invention

Figure 2a is a screw conveyor wound around the grid in accordance with the present invention

Figure 2b is a screw conveyor wound around the rotary wire according to the present invention

Figure 3 is a method of avoiding obstacles when winding the hot wire according to the present invention

* Description of Signs of Main Parts of Drawings *

1: water flow tube

1a: heating wire

1b: coolant

1c: heated water

2: tube wrapping screw conveyor

3: screw conveyor wing

4: motor

5: hopper

6: screw conveyor shaft

7: Dry cake outlet

8: 휀

The present invention relates to a sludge drying apparatus, and more particularly, to a device for implementing a process of removing water contained in sludge by increasing the temperature of the sludge by supplying energy using heat transfer to the sludge containing moisture.

Sludge is a sediment from day treatment or water purification process, also called sludge. Sewage sludge contains about 50% of organic matter, and the water content is 99 ~ 99.5 of active sludge at 96 ~ 98% of initial sludge. As high as%, it is difficult to handle.

Until now, the method of stabilizing sludge by anaerobic treatment and then dewatering and landfilling has been used.However, this method has been changed to a method of directly dehydrating sewage sludge and incineration due to an increase in the amount of sludge. Heat treatment may also be used.

As the sludge treatment method is changed from landfill to incineration, the water content of the sludge containing highly water must be lowered, and various methods are used for this purpose.

  In order to keep the water content of sludge low, the method which has been used so far is to supply high temperature hot air directly to the device containing sludge or supply cold air with low moisture content to reduce the water content of the sludge. Key uses technology and devices configured to heat the sludge by supplying high temperature heat to the sludge to evaporate the moisture contained within the sludge.

However, in order to implement such a method, there is a problem in that a high level of device is required and excessive cost is required to configure the device.

In order to improve this problem, the sludge drying apparatus proposed by the present invention includes a screw conveyor operated by a motor; A hopper 5 installed at a starting point of the screw conveyor and configured to inject sludge into the screw conveyor; An outlet 7 installed at the end of the screw conveyor to discharge the dried cake from which the sludge is dried; A water vapor outlet 8 for discharging water vapor discharged during sludge drying from the screw conveyor to the outside of the screw conveyor; It is characterized by consisting of a heating wire (1a) that is installed outside the tube (2) surrounding the screw conveyor, the steam outlet has a function to discharge the steam to the outside by the rotation of the fan, the heating wire is a tube surrounding the screw conveyor It can be composed of a rotary hot wire treatment for continuous rotation, wrapping the tube surrounding the screw conveyor, lattice type hot wire treatment, or a combination thereof, which partially wraps the tube surrounding the screw conveyor and returns to its original direction. .

Accordingly, an object of the present invention is a device for removing the water contained in the sludge, such as food waste or industrial waste containing a large amount of water, and drying it to change into a dry cake form, the main energy source used for sludge drying In order to change the electrical energy into heat energy, the heating wire is first installed in the cylinder surrounding the screw conveyor, and primarily the cylinder outside the screw conveyor is heated, and the heated energy of the heated cylinder is secondarily transferred to the sludge. In order to implement the sludge drying apparatus by the heating wire proceeds in the process of drying the sludge as a low initial investment cost and a device capable of freely adjusting the calorific value, the sludge drying apparatus comprises a screw conveyor operated by a motor; A hopper 5 installed at a starting point of the screw conveyor and configured to inject sludge into the screw conveyor; An outlet 7 installed at the end of the screw conveyor to discharge the dried cake from which the sludge is dried; A water vapor outlet 8 for discharging water vapor discharged during sludge drying from the screw conveyor to the outside of the screw conveyor; It is characterized by consisting of a heating wire (1a) that is installed outside the tube (2) surrounding the screw conveyor, the steam outlet has a function to discharge the steam to the outside by the rotation of the fan, the heating wire is a tube surrounding the screw conveyor It consists of a rotary hot wire treatment that continuously rotates and wraps the tube surrounding the screw conveyor, and lattice type hot wire treatment, which partially wraps the tube surrounding the screw conveyor and returns to its original direction, or a combination thereof.

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

Referring to Figure 1, Figure 1 is a basic conceptual view of the apparatus according to the present invention for heating water using a heating wire, the heating wire (1a) is wound around a constant pipe (1), the cooling water (1b) is a car is introduced into the water When the heating wire 1a is passed through the wound tube, electricity is supplied to the heating wire and the heated heating wire is heated to generate heat.

The heat generated by this heating wire is basically transferred to the tube enclosed by the heating wire, and the heat transferred to the tube 1 is ultimately transferred to the cold coolant passing through the tube 1, and the cooling water is heated. The cooling water 1b introduced into the heating water is heated while passing through the pipe to become the heating water 1c at the end, and the water has sufficient energy.

Here, the heating wire is a resistance wire for heating at a high temperature by using a heat generation action by a current, and the types thereof include a general heating wire, a silicon heating wire, a carbon heating wire, a special carbon heating wire, and a non-magnetic heating wire. (PP wire, Newjiro) is a heating wire generally used for electric sheet electric yoke mats, etc.Silicone heating wire is a hot wire using a silicon coating, which is more durable than a normal heating wire, and a carbon heating wire is made of carbon as a raw material. Heated wire is a special heating wire, special carbon heating wire is a heating wire coated with an insulator (glass fiber) once more on a silicon coating of carbon heating wire, and a non-thermal heating wire is a heating wire designed to attenuate a magnetic field which is electromagnetic waves.

The use of the above-described heating wires are used in various ways, and primarily used when heating functions using electricity in an electric blanket, carbon (carbon) heating wire is mainly used.

This carbon hot wire is a hot wire made of carbon as a raw material. The carbon has a low thermal expansion coefficient, lightness, lubricity, heat resistance, durability, weak chemicals, and good electrical and thermal conductivity. In addition, it has strong reducing properties at high temperatures and dissolves in metals, so it has low absorption of neutrons and high deceleration capacity.

Because of this characteristic, carbon is a trend that is used as a material as a hot wire, carbon heating wire has a 30% power saving effect than the existing heating wire, has an electromagnetic wave attenuation effect, of course, does not generate electromagnetic waves at all, but is less than the previous heating wire.

When the characteristics of the hot wire is applied to the sludge treatment apparatus, it is necessary to heat and dry the sludge by using steam, hot air, or heat energy itself as a heat source used in existing inventions, inventions, and practical technologies. Unlike the problem of excessive initial investment cost and excessive maintenance cost, the initial investment cost is low in terms of heating the sludge using electric heating only with a simple heating wire installation process, and it is possible to use industrial electric lamps. If the maintenance cost of the device is also low.

Looking at the application example through Figure 2a and 2b, the heating wire (1a) is wound around the outer cover (2) surrounding the screw conveyor blade (3), that is, the tube (2) surrounding the screw conveyor, the screw conveyor wing ( When 3) is introduced into the sludge through the hopper 5 in the process of rotating by the motor (4), electricity is supplied to the heating wire (1a) and heat is generated in the heating wire, the heat energy of the heating wire is screw conveyor blade (3) The sludge is finally dried through the process of increasing the temperature of the sludge, and heating the sludge directly to the tube (2) surrounding the screw conveyor.

As described in FIG. 1, when the cooling water is replaced with sludge as described in FIG. 1, when the operation result of the apparatus of FIG. 1 is to convert the cooling water into heating water, the sludge drying apparatus by heating the heat is introduced into the sludge instead of the cooling water. The sludge at low temperature will be changed to sludge at high temperature.

Compared with the sludge in the low temperature state and the sludge in the high temperature state, the drying process of the sludge proceeds quickly because the sludge temperature can be more rapidly followed by the action of evaporating moisture contained in the sludge. The sludge at the end is already changed to a high temperature even in the case of a dried cake in which the sludge is dried, and when the sludge is incinerated, the sludge is incinerated if additional heat is supplied to the sludge which already contains a certain amount of heat. The cost of maintaining the heat source required for sludge incineration can be said to be low.

By the way, there are two ways to wind the heating wire (1a), the whole of the pipe (2) surrounding the screw conveyor can also be wrapped with a hot wire, a part of the pipe that is auditing the screw conveyor, that is, the position where the sludge is transported You can also wrap the hot wire around the bay.

As an example, in FIG. 2A, a portion of the screw conveyor apparatus is heated by heat, and when the heating wire 1a is wound around the tube 2 surrounding the screw conveyor, the tube surrounding the screw conveyor is not completely wound. In this way, the heating wire is wound up and then rolled up again and then rolled up in the circumferential direction (hereinafter referred to as lattice type hot wire treatment). When this method is used, the heating wire is not wound around the lower part of the screw conveyor. Therefore, the heat generation may be increased by intensively heat-heating only the portion that needs to be heated.

Alternatively, when the hot wire (1a) of the tube (2) surrounding the screw conveyor is treated, as shown in Figure 2b it may be completely hot wire treatment to the lower portion of the tube surrounding the screw conveyor (hereinafter: rotating hot wire treatment).

In this case, the dry cake outlet 7 or the hopper 5 is present at a position where the hot wire is wound, thereby acting as an obstruction to hinder the hot wire treatment.

In order to solve this problem, the hopper or the drying cake outlet should be avoided. In this case, in the process of heating the wire, if there is an obstacle in the direction of the heating wire, the obstacle is bypassed or the obstacle itself is wrapped with the heating wire. While maintaining the direction of the heating wire.

Looking at this process through Figure 3, when the heating wire (1a) is wound on the tube (2) surrounding the screw conveyor, when there is an obstacle such as the hopper (5) when the heating wire is wound in the form of enclosing the obstruction obstruction Hot wire treatment can be avoided to avoid action, or it can be skipped without hot wire treatment, such as not enclosing the hot wire where the obstacle is located.

In addition, even if heat is generated by the heating wire during the heating process after the heating wire is wound, if the outside of the heating wire is not sufficiently protected, the generated heat may not be transferred into the sludge but may be blown into the air and disappear. Since the heat must be protected to ensure sufficient heat transfer to the inside of the sludge, a specific protective layer must be formed to prevent the heat generated from being radiated into the atmosphere. A layer can be formed.

In addition, the principle of the screw conveyor in principle, the central axis is present, but in the case of the present invention, it is also possible that the shaft does not exist in the screw conveyor, it may be composed of only the screw conveyor blade (3).

In addition, as the sludge changes to a high temperature, the moisture contained in the sludge changes to a high temperature and evaporates. At this time, the vaporized high temperature steam must be discharged to the outside.

To this end, the installed device has a structure capable of discharging water vapor to the outside through the rotation of the fan 8 as the fan 8.

The overall feature of the device devised through the present invention is that the initial investment cost is basically low for the installation of the device, and the heating value of the heating wire is controlled according to how closely the amount of the heating wire used for the device configuration, thereby controlling the heating value Even though the variation in the input cost is not great, such sludge drying apparatus includes a screw conveyor operated by a motor; A hopper 5 installed at a starting point of the screw conveyor and configured to inject sludge into the screw conveyor; An outlet 7 installed at the end of the screw conveyor to discharge the dried cake from which the sludge is dried; A water vapor outlet 8 for discharging water vapor discharged during sludge drying from the screw conveyor to the outside of the screw conveyor; It is characterized in that it consists of a heating wire (3) installed outside the tube (2) surrounding the screw conveyor, the steam outlet has a function to discharge the steam to the outside by the rotation of the fan, the heating wire is a tube surrounding the screw conveyor It consists of a rotary hot wire treatment that continuously rotates and wraps the tube surrounding the screw conveyor, and lattice type hot wire treatment, which partially wraps the tube surrounding the screw conveyor and returns to its original direction, or a combination thereof.

The sludge drying apparatus by the hot wire drawn through the present invention, the screw conveyor is operated by a motor; A hopper 5 installed at a starting point of the screw conveyor and configured to inject sludge into the screw conveyor; An outlet 7 installed at the end of the screw conveyor to discharge the dried cake from which the sludge is dried; A water vapor outlet 8 for discharging water vapor discharged during sludge drying from the screw conveyor to the outside of the screw conveyor; It is characterized by consisting of a heating wire (1a) that is installed outside the tube (2) surrounding the screw conveyor, the steam outlet has a function to discharge the steam to the outside by the rotation of the fan, the heating wire is a tube surrounding the screw conveyor It consists of a rotary hot wire treatment that continuously rotates and wraps the tube surrounding the screw conveyor, and lattice hot wire treatment, which forms a portion of the tube surrounding the screw conveyor and returns to its original direction, or a combination thereof. The initial investment cost is low, and the additional input cost required to control the calorific value is very low.

Claims (3)

A sludge drying apparatus, comprising: a screw conveyor for transporting sludge while being rotated by a motor; A hopper 5 installed at a starting point of the screw conveyor and configured to inject sludge into the screw conveyor; An outlet 7 installed at the end of the screw conveyor to discharge the dried cake from which the sludge is dried; A water vapor outlet 8 for discharging water vapor discharged during sludge drying from the screw conveyor to the outside of the screw conveyor; Sludge drying apparatus by a hot wire, characterized in that consisting of a heating wire (1a) is installed outside the pipe (2) surrounding the screw conveyor. The sludge drying apparatus according to claim 1, wherein the steam outlet discharges water vapor to the outside at a rotation of kPa. 3. The heating wire according to claim 1 or 2, wherein the heating wire is a rotary hot wire treatment for continuously rotating the tube surrounding the screw conveyor, the tube surrounding the screw conveyor, and partially wrapping the tube surrounding the screw conveyor and returning to its original direction. Sludge drying apparatus by a hot wire, characterized in that consisting of a lattice type hot wire treatment or a combination thereof.

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