KR20120084220A - Sludge drying apparatus - Google Patents

Abstract

PURPOSE: An apparatus for drying sludge is provided to efficiently dry dehydrated sludge from a drier such that the water content of the dried dehydrated sludge becomes carbonizable. CONSTITUTION: An apparatus for drying sludge includes a transferring pump(5), a dehydrated sludge agitator(30), a drier(40), a steam heater(43), a cyclone(60), a conveyor(41), a cooling conveyor(44), a dried sludge storing bath(50), and an introducing hopper(53). The dehydrated sludge agitator agitates sludge transferred by the transferring pump. The drier receives the agitated sludge from the agitator and dries the sludge at a temperature between 85 and 95 degrees Celsius. The steam heater is in connection with the drier and provides steam to the drier as a drying source. The cyclone is in connection with the direr in order to dust from the drier. The conveyor discharges the dried sludge. The cooling conveyor cools the dried sludge. The introducing hopper introduces the sludge into a cabonizer.

Description

Sludge Drying Equipment {SLUDGE DRYING APPARATUS}

The present invention relates to, for example, an apparatus for treating organic sludge generated after sewage treatment, and more particularly, to a sludge drying apparatus for drying dehydrated sludge.

Since sludge off-sea discharge is completely prohibited from 2012, it is necessary to establish fundamental measures for sludge treatment. Therefore, the present invention is to efficiently dry and minimize the energy consumption used for drying the sludge among the equipment to build the organic sludge after the sewage treatment, and to recycle the by-products after carbonization, such as leakage of odor and sludge contaminants Developed equipments that can be dried and dried without environmental pollution

In the conventional case, there is a problem in that the odor is leaked from the dryer and diffuses the odor not only in the factory but also in the surroundings, and boiler fouling occurs due to a lack of dust removal equipment in the dry exhaust gas, and duct clogging occurs.

In addition, the amount of energy used in the dryer is inefficiently consumed, the drying efficiency is reduced, and adhesion occurs in the dryer, which may cause a breakdown. In the stockpile dry sludge storage tank, there is a vulnerable part to fire and explosion.

The present invention is to solve the above problems, by installing an air suction duct in the drying chamber to prevent the spread of odors, the installation of the cyclone 60 to remove the exhaust gas dust efficiently, the dehydration sludge is sufficiently dry with a water content that can be carbonized Has developed a facility to

In addition, the present invention is a high-efficiency dryer that minimizes the use of steam, and in consideration of the sticky section, the sludge recycling system was introduced to exclude the formation of the glue zone (viscosity region). That is, the present invention is to improve the continuous operation and to reduce the power load by applying a dry sludge circulation system for excluding the viscous region

In addition, according to the present invention can be configured as a power-saving drying device that consumes a minimum of energy, and further gave safety to the dry sludge storage tank.

The main constitution of the present invention accommodates a transfer pump 5 for transferring dewatered sludge, a dewatered sludge mixer 30 for mixing sludge conveyed by the transfer pump 5, and sludge supplied from the mixer 30. Dryer 40 to be dried, a steam heater 43 connected to the dryer 40 to supply steam to be used as a drying heat source in the dryer, and a dryer to remove dust generated and exhausted from the dryer 40. Cyclone 60 connected to the 40, a conveyor 41 for discharging and transporting the sludge dried in the dryer 40, a cooling conveyor 44 for cooling and transporting the dry sludge, and storing the dry sludge It characterized in that it comprises a gun sludge storage tank 50, and an input wave 53 for injecting the sludge conveyed from the gun sludge storage tank 50 to the sludge carbonization, dust in the cyclone 60 is dust collected downward. Been removed And, the exhaust gas is characterized in that the exhaust gas blower 46 is connected to be discharged to the upper portion is sent to the collision-type dehumidification tower 66, the sludge having a moisture content of about 25% dried in the dryer (40). Is transported to the conveyor 41 is combined with the dehydration sludge is re-injected, the dryer 40 is a disk type dryer in which the disk 49 is installed in a vertical arrangement on the shaft, the steam inlet ( 47 is formed to inject steam, which is a heat source for drying, and a condensate outlet 48 is formed at a lower side opposite the steam inlet 47 at the side end, and the mixer 30 is horizontally disposed therein. The mixer shaft 31 is formed, and the fan-shaped paddle 32 is formed on the shaft, and the sludge inlet 33 and the dry sludge inlet 36 which are returned and injected from the dryer 40 are respectively formed in the upper portion. , Sludge outlet (34) It is characterized in that the configuration is connected to the dryer 40, the dry sludge storage tank 50 is connected to the nitrogen supply device 67, characterized in that to prevent fire and explosion by supplying nitrogen.

Other configurations other than the above-described features will be described further below with the accompanying drawings.

According to the present invention, by installing an air suction duct in the dryer 40 to prevent the spread of odor and incineration in the boiler 110 is perfect to remove the odor

In addition, by installing the cyclone 60 in the dryer 40, the exhaust gas dust can be efficiently removed, and the exhaust gas can be re-introduced into the dryer 40 to save energy, and dehydration sludge dehydrated from the dryer. Can be dried efficiently at the carbonizable water content

In addition, the present invention is a high-efficiency drying system with minimal energy consumption, and by introducing a sludge recycling system in consideration of the adhesive section, it is possible to efficiently operate continuous operation by preventing the formation of glue zones in which the clogging occurs in the dryer.

In addition, the nitrogen supply device (67) is installed in the dry sludge storage tank (50) to further increase the safety against explosion.

1 is a configuration of the entire system according to the present invention
Figure 2 is a perspective view of the main cutaway for the disc type dryer
3 is a view for explaining the mixer 30 used in the present invention.

As shown in FIG. 1, the dewatered sludge supplied from the dewatered sludge conveying pump 5 is introduced into the dewatered sludge mixer 30 with a water content of about 80% and introduced into the dryer 40 to be dried.

As shown in FIG. 3, the mixer 30 is composed of sludge mixing by two-axis paddles having two mixer shafts 31 and crosses each other by rotation of a fan paddle 32 installed at the mixer shaft 31. Mixing performance is very good

Meanwhile, a uniaxial plow type mixer in which the mixing portion is formed in the shape of a plow may also be used, which is relatively inferior in mixing efficiency and transfer efficiency, and is suitable for the bulk solid mixing and the addition structure of the fluid. Not suitable for use

The material to be mixed in the mixer 30 is a sludge inlet 31 is introduced into the sludge flowing from the transfer pump 5, the sludge inlet 36 to the sludge through the dryer 40 is re-inlet, sludge At the outlet 34, the sludge after mixing enters the dryer 40.

In the dryer 40 illustrated in FIG. 1, steam is provided through the steam inlet 47 by the steam heater 43 as a drying heat source. The amount of steam is controlled by a steam control valve using steam generated by the boiler 110. Drying temperature can be controlled by adjusting, and drying performance can be removed up to 10% at 80% moisture content. That is, the sludge moisture content after drying can be adjusted to about 10% or less, so that it can be dried at a water content that can be carbonized in a subsequent carbonization process.

The sludge dryer 40 used in the present invention uses a disk type without using a paddle type. Paddle type is not desirable because of complicated driving structure, large power consumption, inconvenient maintenance, and wide paddle end surface rubbing with the construction, which is vulnerable to abrasion.It is uneven in temperature distribution and difficult to discharge condensate by one heat supply

On the other hand, the disk type sludge dryer 40 used in the present invention has a structure in which a circular disk is arranged on one axis, and the driving part is small and the driving force is not large. Excellent wear resistance, less exhaust gas, less dust, two heat source split supply, excellent heat transfer effect and can prevent overheating. In addition, it is possible to prevent solidification and dry powder during drying and to prevent odor spill by internal vacuum drying method.

The drying principle of the disc dryer 40 is to use high temperature steam as a drying heat source and to dry the sludge introduced by indirect conductive heat.

For reference, as shown in FIG. 1, a steam heater 43 is installed at the side of the dryer 40 so that steam generated from the steam heater 43 is supplied to the dryer 40 through the steam inlet 48. As shown, the steam required for drying is introduced into the shaft through the steam inlet 47 and the sludge introduced into the dryer through the metering feeder is dried by conduction heat of the heated disk 49 surface.

Due to the rotation of the disk 49, the stirring of the material is always performed on the disk heating surface, thereby preventing overheating and drying the sludge by atomizing and drying, and thus the drying efficiency is very high. The steam supplied to the disk 49 is condensed after heating the sludge and is recovered to the condensate tank (not shown) through the condensate outlet 48 in both directions through the internal pipe (not shown). In addition, by adopting the vacuum drying method to keep the inside of the dryer at a negative pressure of -20 to -30 mmH ₂ O, there is no outflow of odor, it has excellent drying efficiency, low evaporation temperature and energy saving effect.

In the dryer 40, the sludge to be dried has a water content of about 80%, which can be lowered to 10% water content. That is, the drying treatment capacity is 60% to 70% can be dried. Drying temperature is maintained at 85 to 95 degrees Celsius when drying. If it is more than 100 degrees Celsius, it may be burned, and if it is below the above range, the drying performance is much lowered.

The sludge treated in the dryer is re-injected into the dewatered sludge mixer 30 via the conveyor 41 and the vertical conveyor 42 in an amount of about 25%. The reason for the re-injection is to allow continuous operation by preventing dry sludge due to the high water content and the shutdown in the device due to the adhesion of the sludge. . Thus, the continuous drying efficiency in the dryer 40 is increased.

Part of the sludge dried in the dryer 40 is stored in the dry sludge storage tank 50 via the cooling conveyor 44 and the vertical conveyor 45. The dried sludge is stored in the gun sludge storage tank 50 and then supplied to the inlet hopper 53 of the sludge carbonizer via the vertical sealed conveyor 51. The reason for using the sealed conveyor 51 is to prevent scattering dust spills.

On the other hand, the cyclone 60 is installed on the dryer 40, and the cyclone 60 receives gas and dust generated from the dryer 40 as the upper inlet 63 by using centrifugal force and gravity settling. To remove the dust, the gas is discharged to the upper outlet 64, the dust is removed to the bottom and the superheated air can be re-introduced to the dryer 40 to recycle the heat of the dry air. The cyclone 60 is capable of processing hot gas, has a low pressure loss, and the larger the size of the dust particles, the higher the collection efficiency, the better the dry collection and dust removal, and the lower the operating cost.

 The gas outlet 64 of the cyclone 60 is connected to the exhaust gas blower 46 and the exhaust gas blower 46 is connected to the collision type dehumidification tower 66 to remove moisture of the exhaust gas. The dehumidification method uses a dehumidification tower using a wet collision method.

30 Mixer 31 Mixer Shaft
32 Fan Paddle 33 Sludge Inlet
34 Sludge Exit 36 Gun Sludge Exit
40 Dryer 47 Steam inlet
48 Condensate outlet 49 disc
50 Gun Sludge Reservoir 60 Cyclone
66 Crash Dehumidification Tower 67 Nitrogen Supply System
110 boiler

Claims (6)

A transfer pump 5 for transferring the dewatered sludge,
Dewatered sludge mixer 30 for mixing the sludge conveyed by the transfer pump (5),
A dryer 40 for receiving the sludge supplied from the mixer 30 and drying at a temperature of 85 to 95 degrees Celsius,
A steam heater 43 connected to the dryer 40 to supply steam to be used as a drying heat source in the dryer,
A cyclone 60 connected to the dryer 40 to remove dust generated and exhausted from the dryer 40,
A conveyor 41 for discharging and transporting the sludge dried in the dryer 40,
A cooling conveyor 44 for cooling and transporting the dry sludge,
Gun sludge storage tank (50) for storing the dry sludge,
Sludge drying apparatus, characterized in that it comprises an input wave 53 for injecting the sludge conveyed from the gun sludge storage tank 50 into the sludge carbonizer. The method of claim 1,
In the cyclone 60, the dust is collected and removed downward, the exhaust gas blower 46 is connected to the exhaust gas blower 46 to be discharged to the upper side is sent to the dust-impact dehumidification tower 66, characterized in that the sludge drying apparatus The method of claim 1,
Sludge drying device characterized in that 25% of the sludge dried in the dryer 40 is transferred to the conveyor 41 and re-introduced into the dewatered sludge mixer 30. The method of claim 1,
The dryer 40 is a disk type dryer in which the disk 49 is installed in a vertical arrangement on the shaft, and a steam inlet 47 is formed at a side end to inject steam, which is a heat source for drying, and a steam inlet 47 at the side end. Sludge drying device, characterized in that the condensate outlet 48 is formed in the lower side opposite The method of claim 1,
The mixer 30 has a mixer shaft 31 formed horizontally therein, and fan-shaped paddles 32 are formed on the shaft, and the mixer 30 is returned from the sludge inlet 33 and the dryer 40 to be injected therein. The sludge inlet 36 is formed, respectively, the sludge outlet device is characterized in that the sludge outlet 34 is formed in connection with the dryer (40). The method of claim 1,
Sludge drying apparatus characterized in that the dry sludge storage tank 50 is connected to the nitrogen supply device (67) to prevent fire and explosion by supplying nitrogen.

Images