KR20190133969A - Boiler system burnning pellets self-producting of orgnic sludge - Google Patents

Abstract

The preset invention relates to a sludge drying apparatus, as a boiler system to burn pellets self-produced with organic sludge, which quickly ferments and dries sludge and a composite material, and multi-stage stacks and arranges the sludge having passed through a heating device to solidify the same. In particular, an excellent effect in the stirring and mixing of the sludge and the material in an initial stage can be achieved. By using a plurality of heat sources at the same time in a double jacket structure, it is possible to heat the sludge material for quick transfer, thereby lowering moisture content. The high temperature gas of an outer jacket is recycled as a heat source of an inner jacket.

Description

Boiler system burnning pellets self-producting of orgnic sludge}

The present invention relates to a boiler system for burning pellets produced by organic sludge. Specifically, the present invention is to dry the sludge by heating the mixture of the auxiliary material mixed with the sludge, and to burn the pellets produced by the organic sludge produced by heating and transporting the sludge using a complex structure of the inner cylinder and the outer cylinder. Relates to a boiler system.

Waste from residential or industrial areas is fed to high water content sludge, solidified and discharged through drying and heating processes.

Several processes are known for drying and heating the sludge. Recently, there have been attempts to lower the water content of sludge by adding auxiliary materials such as dehydrating materials or auxiliary sludge to sludge as well as from the process point of view. For example, Korean Patent No. 1673959 discloses a technology for supplying sludge after two-stage grinding of wood-based dehydration aids in a hopper to mix wood-based dewatering aids with pure sludge from waste. Another Korean patent 0506400 discloses a technique for promoting dehydration using starfish powder after irradiating sludge with radiation.

As the amount of waste sludge generated during the treatment of wastewater in the sewage terminal treatment plant and wastewater treatment plant has recently increased, a large-capacity treatment sludge conveying device that can quickly transfer a large amount of sludge to the heating process while combining auxiliary materials The need to develop a larger.

In addition, several processes for drying and heating the sludge are known. For example, as shown in FIG. 7, Korean Patent No. 1610926, after preheating the sludge in the conveying screw (10 ') and passed through the jacket 21' of the heating device 20 'and stirred and heated, the second Disclosed is a combined drying apparatus for discharging solidified sludge by subsequent heating in a transfer screw (30 '). The jacket 21 'is a rotary kiln, and the so-called "indirect heating method" is adopted in which the gas supplied through the line 22' heats the outside of the jacket 21 'to heat the sludge. Therefore, the heating device 20 'here can actually be said to belong to a single heating device.

For example, Korean Patent No. 1496704 discloses a hybrid heating method using both inside and outside of a jacket. However, this patent is for drying soils containing contaminants, wherein the soils of low concentrations and low volatilities are heated directly to the inner jacket, and the soils of high concentrations of contaminants are indirectly heated to the outer jacket. The heat source inside and outside the jacket is not used at the same time.

Recently, as the amount of waste sludge generated during the treatment of wastewater in sewage treatment plants and wastewater treatment plants increases rapidly, there is a growing need to develop a hybrid type sludge conveying device capable of rapidly transporting a large amount of sludge. The present invention is devised in this respect.

It is therefore an object of the present invention to provide a sludge drying and conveying apparatus capable of rapidly processing a heating and conveying process simultaneously while lowering the water content of the sludge.

An object of the present invention is to provide a sludge treatment system having the sludge drying and conveying apparatus to increase the sludge treatment efficiency.

Moreover, an object of this invention is to provide the hybrid type sludge conveying apparatus which can convey rapidly, heating a large amount of sludge, and especially can reduce a moisture content significantly.

In order to achieve the above object, an embodiment of the present invention is a sludge drying and conveying apparatus in which each stage occupies the same space on a plane and is vertically spaced apart, and the sludge supplied to the conveying apparatus is provided at each stage. The housing is accommodated and moved by the conveying member of the installed housing, the housing having a first region in which a plurality of stirring rods inclined side by side so as to converge toward the center of the conveying member toward the forward direction of the sludge and the conveying member toward the backward direction of the sludge A hybrid type sludge heating apparatus for heating a sludge material, comprising: a second region arranged in parallel with a plurality of stirring rods inclined to converge toward the center, the apparatus comprising: an inner jacket for heating in direct contact with the sludge material; It is installed outside the inner jacket and includes an outer jacket that indirectly heats the sludge material. The communication path of the first burner, which heats the inner jacket, communicates with the discharge portion of the hot gas G2 supplied through the second burner installed in the outer jacket so that the hot gas G2 is supplied from the first burner. It relates to a hybrid type sludge heating apparatus that is joined to the gas (G1) to be supplied to the inner jacket.

A plurality of rollers that rotate by the rotation of the gear is arranged on the side of the housing and the transfer member is arranged to cover the upper and lower portions of the roller shaft of the roller, the stirring rod may rotate in conjunction with the rotation of the roller. .

The hot gas may be supplied to the lowermost stage of each stage to move to the upper stage while heating the housing to be discharged to the outside.

Another embodiment of the present invention is a hopper-shaped sludge storage unit for receiving and storing the sludge, a storage silo for accommodating auxiliary material, and a first fermentation-drying mixture of the sludge of the sludge storage unit and the auxiliary material of the storage silo The sludge processing system provided with the sludge drying and conveying apparatus of any one of Claims 1-3 is provided.

Another embodiment of the present invention is a sludge drying and conveying apparatus in which each stage occupies the same space in a plane and is vertically spaced apart, and the sludge supplied to the conveying apparatus is accommodated in a conveying member of a housing installed at each stage. And moved, and the hot gas is supplied to the lowermost stage of each stage to move to the upper stage while discharging the housing to be discharged to the outside.

Another embodiment of the present invention is a hybrid heating apparatus for heating and drying a mixture of sludge and auxiliary materials, and the sludge drying and conveying apparatus of claim 5 subsequent to the hybrid heating apparatus for naturally drying the mixture discharged from the hybrid heating apparatus. Providing a sludge treatment system installed in order.

According to the present invention, the sludge can be quickly and largely transferred while lowering the water content of the sludge by fermentation drying or natural drying.

According to the present invention, since the external hot gas is supplied to the final outlet end of the sludge mixture and discharged through the inlet end, the sludge mixture can be heated quickly and evenly.

The system equipped with the sludge drying and conveying apparatus of the present invention is economically advantageous because it can process sludge in large quantities and is relatively inexpensive.

According to the present invention, since the sludge material is heated while being in direct contact and indirect contact, the water content can be significantly lowered.

According to the present invention, since the hot gas of the outer jacket is utilized as the heat source of the inner jacket, the resource regeneration rate is high and the thermal efficiency is improved.

According to the present invention, since the final pellet of the sludge material is used as a heat source of the burner, it is environmentally friendly and can reduce costs.

1 shows an overall process of a sludge treatment system comprising the sludge drying and conveying apparatus of the present invention;
2 is a side view of the sludge drying and conveying apparatus of the present invention;
3 is a plan view of the housing of the present invention;
Figure 4 is a side view of the second sludge drying and conveying apparatus of the present invention.
5 is a side view of the hybrid heating device of the present invention;
FIG. 6 is a side view showing the gas flow of the apparatus of FIG. 2; FIG. And
7 is a side view of the sludge heating apparatus of the prior art.

Some embodiments of the invention will now be described in detail with reference to the accompanying drawings. In adding reference numerals to the elements of each drawing, it should be noted that the same elements are designated by the same reference numerals as much as possible even though they are shown in different drawings. In describing the present embodiment, when it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present embodiment, the detailed description thereof will be omitted.

In describing the components of the present embodiment, symbols such as first, second, i), ii?), A), and b) may be used. These symbols are only to distinguish the components from other components, and the nature, order or order of the components are not limited by the symbols. In addition, when a part of the specification is said to include or include any component, this means that it may further include other components, except to exclude other components unless expressly stated to the contrary. do. In addition, the term 'connection', 'installation' or 'attachment' in the specification does not only mean direct connection or direct installation or attachment between components, but also includes connection, installation or attachment through indirect or other components. As broadly as possible.

1 is a view showing the overall process of the sludge treatment system 1 including the sludge drying and conveying apparatus 30 of the present invention.

The sludge treatment system 1 includes a hopper-shaped sludge storage unit 10 for receiving and storing sludge and a storage silo 20 for receiving auxiliary material, for example, wood flour. The sludge and the auxiliary material are fermented and dried while passing through the sludge drying and conveying device 30, heated in the hybrid heating device 50 through the conveyor 40 to lower the moisture content, and then collected in the hopper-shaped intermediate storage 60. After passing through the second sludge drying and conveying device 70, the product is naturally dried and cut in the pellet forming machine 80 and discharged into standardized pellets. Auxiliary materials may include non-wood fly ash or inorganic or organic solids.

2 is a side view of the sludge drying and conveying apparatus 30 of the present invention.

The sludge drying and conveying device 30 is made of a multistage device of a first stage 30a, a second stage 30b and a third stage 30c. Each stage occupies the same space on a plane and is vertically spaced apart. The sludge is received and transported in the housing 32 of each stage. Members having the same function at each stage are described using the same member number.

First, the first stage 30a will be described. On the left side of the housing 32, a motor 310, which is a driving source, and a motive gear 306 rotating by driving of the motor 310 are mounted, and the motive gear 306 is mounted. The pulley is connected to the first gear 302, and the first gear 302 is connected to another adjacent first gear 302 through the idle gear 304. Since the primary gear 306 and the idle gear 304 are the same small diameter, the first gear 302 is made of a relatively large diameter, the first gear 302 rotates at the same rotational speed. 300 is a roller and rotates by the rotation of the first gear 302 to move the sludge.

Before and after the center point of the first stage 30a, a pair of motors 326, a suspension gear 320 connected to the motive gear 324 connected to the motor 326 through a pulley, and a suspension gear 320 A crossbar 328 across the gap is provided. The reverse rotation of the motor 326 causes the crossbar 328 to move forward or backward.

The sludge and auxiliary materials are supplied from the feed hopper to the left inlet of the first end 30a through the inlet 310a, and the roller is rotated by the rotation of the motor 310 to be transferred to the position before the entry of the crossbar 328. The material dropped to the crossbar 328 is transported to the right end of the crossbar 328 while being mixed evenly by vibration and movement by the forward and reverse rotation of the motor 326, and then falls and is supplied to the second end 30b.

The second stage 30b and the third stage 30c have basically the same structure, and have the same driving unit as the first stage 30a. The roller 300 rotates by the rotation of the motor 310, and the material dropped from the first end 30a is transferred from the right side to the left side of the second end 30a, and then falls and is supplied to the third end 30b. Then, it is transferred from the left side to the right side of the third stage 30a, and then falls and is supplied to the moving unit.

The moving part is provided below the third end 30c, and has a structure in which the belt 336 is driven by the rotation of the drive gear 332 by the rotation of the motive gear 334 which is rotated by the motor. The sludge is moved to the right through the belt 336 and is supplied to the hybrid heater 50 via the conveyor 40 vertically placed.

In the above sludge drying and conveying apparatus 30, the driving on / off of the apparatus, the rotational speed and the rotational direction of the motor, and the like are controlled by a controller or a remote controller installed in the control panel.

3 is a plan view of the housing 32 of the present invention. The structure of FIG. 3 may be installed throughout the housing 32 or limited to a particular stage or specific location.

Each of the pair of rollers 300 is connected to the roller shaft 352 and the transfer member 350, such as a conveyor belt, is caterpillar so as to cover the upper and lower portions of the plurality of roller shafts 352 arranged in parallel. Is installed in the mold. When the roller 300 rotates, the transfer member 350 rotates indefinitely using the roller shafts 352 located at both ends, and the sludge mixed with the auxiliary material moves to the right side of the drawing.

According to the present invention, the housing 32 is divided into a first region 32a and a second region 32b, and the first region 32a is inclined to converge toward the center of the transfer member 350 toward the forward direction of the sludge. A plurality of stirring rods 400a are arranged side by side, and in the second region 32b, a plurality of inclination rods 400b that are inclined so as to converge toward the center of the transfer member 350 toward the backward direction of the sludge is arranged in parallel. . The stirring rods 400; 400a and 400b are arranged at the same position as the roller shaft 352 along the top and bottom of the frame 354 of the housing 32 in the illustrated example, but may be arranged at larger or smaller intervals. Of course.

If the arrangement of the stirring rods 400 in each region is different, the material passing through the first region 32a gradually gathers toward the center in the forward direction along the shape of the stirring rod 400a and passes through the second region 32b. Since the material to be distributed along the shape of the stirring rod 400b gradually toward the outside in the center of the forward direction, the sludge and the auxiliary material can be properly mixed and stirred.

The stirring rod 400 may be fixed to the frame 354, but alternatively, for example, the stirring rod 400 may rotate in conjunction with the roller shaft 352. In this case, the sludge and the auxiliary material may be rotated by the stirring rod 400. It can be transported more evenly mixed.

The stirring rod 400 of the present invention has a certain direction, but basically functions as a tool for stirring the solution in the container, it can be seen that it is advantageous in terms of increasing the stirring and mixing efficiency of the material.

The first region 32a and the second region 32b may be continuous as shown, but have a transition region without the stirring member 400 in the middle or a shape parallel to the roller shaft 254 in the transition region. Various modifications are possible, such as installing a stirring member.

Next, Figure 4 is a side view of the second sludge drying and conveying apparatus 70 of the present invention. Since the second sludge drying and conveying apparatus 70 has the same configuration as the sludge drying and conveying apparatus 30, the same member is denoted by the symbol "'" and detailed description thereof will be omitted.

The material supplied to the second sludge drying and conveying device 70 is a composite or mixture of solid sludge and auxiliary material which has passed through the hybrid heating device 50, and has a water content of about 20%. The mixture is supplied to the moving part through a path as described above in FIG.

In the present invention, the hot gas supplied from the heating source of the hybrid heating device 50 is received at the inlet of the third stage 30c 'via the path 500a, that is, the lower portion of the housing 32', that is, the transfer member ( 350 ') and flows upwards while passing through the paths 500b and 500c while sequentially heating the second end 30b' and the first end 30a 'and discharged to the outside through the path 500d. I am trying to. Since the hot gas forms a zigzag or sand-shaped path so that the hot gas passes through all of the lower portions of the housing 32 'at each stage, the moving mixture can be evenly heated to further lower the moisture content.

The hot gas regeneration utilization of the heating source can be applied to the sludge drying and conveying apparatus 30 of FIG. 2 in the same manner. Since the sewage sludge has an organic content of more than 50% and contains a large amount of microorganisms, the water content of the sludge can be further reduced by fermentation and drying by feedback heating. According to the applicant's test, by applying the fermentation drying method, the water content of the sludge was lowered to about 50 to 60% from 80% or more and supplied to the hybrid heating device 50.

Since the second sludge drying and conveying apparatus 70 is intended to naturally dry the supplied mixture after being solidified to some extent, it is not "fermentation drying", and therefore, the stirring rod 400 described in FIG. 3 may not be installed.

Although the preferred embodiment of the present invention has been described above, the present invention is implemented as a two-stage drying and conveying device by lengthening each stage, for example, or by installing an independent heater at the bottom of the housing 32 to increase the water content. Various modifications are possible, such as lowering.

The following describes the overall process of the sludge treatment system including the hybrid heating apparatus of the present invention.

5 is a side view of the hybrid heating apparatus of the present invention, FIG. 3 is a side view showing the gas flow of the apparatus of FIG. 2, and FIG. 4 is a side view of the sludge heating apparatus of the prior art.

5 is a side view of the hybrid heating device 50 of the present invention. The sludge material before being introduced into the hybrid heater 50 is in a state of being fermented to some extent. The hybrid heating device 50 of the present invention lowers the water content of the sludge material by utilizing both the inner and outer jackets at the same time.

The hybrid heating device 50 is supported by the stand 800 as a dual structure in which a jacket 520 is formed as an inner jacket 520a constituting an inner cylinder and an outer jacket 520b constituting an outer cylinder. The sludge material falls through the feed hopper 400 and is moved forward by the feed screw 402 to be supplied to the inner jacket 520a.

A motor 522 and a rotating gear 524 connected to the motor 522 by a pulley are installed on an outer surface of the casing of the outer jacket 520b at a central portion of the jacket 520 in a longitudinal direction, and the rotating gear 524 is an inner jacket ( It is connected to the inner jacket 520a via a suspension cable 526 installed around the outer casing of 520a. When the motor 522 rotates, the suspension cable 526, which serves as a pulley by the rotation of the rotary gear 524 is rotated to rotate the inner jacket (520a). Thus, the inner jacket 520a functions like a rotary kiln. The outer jacket 520b does not need to rotate because it is not in direct contact with the sludge material.

Inside the inner jacket 520a, a guide 528 like a blade is formed along the inner surface of the casing in the longitudinal direction. A first burner 600a that provides heat is attached to the front (left side of the drawing) inlet of the inner jacket 520, and the hot gas burned by the first burner 600a passes through the communication path 602a. 520a is supplied inside. A discharge part 630 is installed at a rear (right side of the drawing) exit side of the inner jacket 520, and a lid for opening and closing the gas discharge part 632 and the gas discharge part 632 at an upper part of the discharge part 630 ( 634, a sludge discharge part 636 and a lid 638 for discharging the sludge material are disposed below the discharge part 630. Lids 634 and 638 remain open during operation of hybrid heater 50.

The sludge material is heated by the hot gas while moving rearward (right side of the drawing) along the guide 528 as the inner jacket 520a rotates, and the hot gas is heated through the gas discharge part 632 to solidify the sludge material. Is supplied to the atmospheric hopper 700a through the sludge discharge unit 636. The sludge material moving in the inner jacket 520a is directly contacted and heated by hot gas.

The outer jacket 520b is installed around the entire exterior of the inner jacket 520a, and a second burner 600b for providing heat is attached to the front inlet side, and the hot gas burned by the second burner 600b is in communication. It is supplied into the outer jacket 520b through the furnace 602b. As shown in the figure, three external discharge parts 606a of the hot gas are provided from the left side. The leftmost discharge portion 606a is in communication with the induction pipe 608, and the induction pipe 608 is in communication with the communication path 602a on the inlet side again. A rotary valve 610 for controlling opening and closing of the flow path is installed between the discharge part 606a and the induction pipe 608. During operation of the hybrid heater 50, the rotary valve 610 is set to ON so that the discharge part 606a and the induction pipe 608 at the left end communicate with each other, and the remaining two discharge parts 606a are closed.

Hereinafter, the hot gas flow of the jacket 520 will be described with reference to FIG. 6.

When the hybrid heating device 50 is operated, as described above, the hot gas G1 of the inner jacket 520a is discharged to the outside through the gas discharge part 632 while heating the sludge material. In addition, the hot gas G2 of the outer jacket 520b gathers into the discharge part 606a at the left end, which is the only outlet, while indirectly heating the sludge material indirectly, and enters the communication path 602a to join the hot gas G1. It is used as a heat source for heating by direct contact with sludge material. Since the hot gas G2 is regenerated and utilized without being discharged to the outside through the other two discharge units 606a, the thermal efficiency can be greatly improved.

On the other hand, as a heat source of the first burner 600a and the second burner 600b, liquefied gas or coal, which is a solid raw material having a high calorific value, may be used. However, in the present invention, the pellet cut by the pellet molding machine 80 is burned. It is desirable to recycle as a heat source. By recycling sludge as fuel, eco-friendly green system can be saved while reducing costs.

After the driving of the hybrid heating device 50 is finished, the flow path is closed by the rotary valve 610, and the remaining two discharge parts 606a are opened to discharge the hot gas G2 to the outside.

Reference numeral 604 is a mounting table for firmly mounting the outer jacket (520b) to the stand (800).

Applicants' test showed that by applying the hybrid heating device 50, the water content of the sludge material could be drastically lowered from 50 to 60% to 20% at the time of introduction. Since the sludge material is subsequently passed through the second sludge drying and conveying device 70, the water content is further lowered and discharged into the solid pellets, so that the sludge material can be used as a heat source of the hybrid heating device 50 of the present invention as described above. .

Although the preferred embodiment of the present invention has been described above, the present invention may be modified in various ways, for example, by arranging a return path of the inner jacket 520a of the hot gas G2 at the inlet side instead of the inlet side.

Although the embodiments of the present invention have been described as an example, they do not limit the scope of the present invention, and various changes or modifications may be made to the present invention, and these also belong to the scope of the present invention. The scope of the invention extends to the same or equivalent area as the claims described below.

(1): sludge treatment system (30): sludge drying and conveying device (32): housing (70): second sludge drying and conveying device (300): roller (310): motor (328): crossbar (350) : Transfer member 400: stirring rod

Claims (5)

A sludge drying and conveying apparatus in which each stage occupies the same space in a plane and is vertically spaced apart, and the sludge supplied to the conveying apparatus is received and moved in a conveying member of a housing installed in each stage. A first region in which a plurality of stirring rods inclined to converge toward the center of the conveying member toward the forward direction of the sludge is arranged side by side, and a plurality of stirring rods inclined to converge toward the center of the conveying member toward the backward direction of the sludge in parallel A hybrid type sludge heater for heating sludge material, comprising a second area disposed therein, the device being installed outside the inner jacket and the inner jacket for heating the sludge material in direct contact with the sludge material and indirectly introducing the sludge material. An outer jacket for heating and a communication path of the first burner for heating the inner jacket, the outer jacket The organic sludge is in communication with the discharge portion of the hot gas (G2) supplied through the second burner installed in the condenser, so that the hot gas (G2) joins the hot gas (G1) supplied from the first burner and is supplied to the inner jacket. System to burn pellets produced by the furnace
The method of claim 1,
On the side of the housing is arranged a plurality of rollers to rotate in the rotation of the gear and the conveying member is arranged to cover the upper and lower portions of the roller shaft of the roller, the stirring rod is rotated in conjunction with the rotation of the roller, organic Boiler system for burning pellets produced by sludge
The method of claim 2,
Boiler system for burning self-produced pellets with organic sludge, which is supplied with hot gas to the lowermost stage of each stage to move to the upper stage while discharging the housing while heating the housing.
The organic sludge furnace of claim 2, wherein a plurality of discharge parts of the hot gas G2 are installed outside the outer jacket, and the discharge parts except for the discharge part connected to the communication path of the first burner are closed during operation of the hybrid device. Boiler system to burn produced pellets
5. The organic sludge self-producing according to claim 4, wherein the sludge material is supplied with a moisture content of at least 50% or more, and the moisture content is lowered to about 20% by simultaneous combined heating of the inner and outer jackets of the hybrid apparatus. Boiler system to burn one pellet

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