JPH0222079Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is an aeration method for energy-saving drying of sludge and other granular and lumpy water-containing solids generated in the treatment of wastewater such as sewage, human waste, and various industrial wastewater. This relates to a drying device.

[Prior art]

In conventional ventilation drying equipment (the typical model is the ventilation band dryer), the discharge pressure of the blower that supplies warm air for drying is several hundred mmAq or less. The amount of gas leaking from the discharge section is not a problem, and as a result, there is no need to make any special changes to the structures of the water-containing solids supply section or the discharge section of the drying section, and rotary valves, screw feeders, etc. with poor gas sealing properties can be used. This could be easily handled with a sufficient opening/closing mechanism.

[Problem that the invention attempts to solve]

However, the compression heat (temperature 60-80
When attempting to dry water-containing solids using a temperature of approximately
The pressure is about 0.6 to 0.7 Kgf/cm ² . No conventional ventilation drying device can handle such high-pressure hot air or other high-pressure hot air. Therefore, there is a need to develop a new type of aeration drying device that can efficiently utilize the heat retained in compressed air or other high-pressure hot air discharged from an aeration blower.

The present invention can efficiently utilize the air discharged from the aeration blower and other high-pressure hot air, which was not applicable to conventional aeration drying equipment, and stops the supply of high-pressure hot air when supplying hydrated solids and discharging dry materials. The purpose of the present invention is to provide a new type of aerated drying device that can perform continuous processing without drying, improves heat utilization efficiency, and simplifies device operation.

[Means for solving problems]

In the present invention, the bottom of the tank body is formed into an inverted conical shape, and the top of the tank body and the water-containing solids supply section above the tank body are connected via valves arranged facing each other with a space interposed between them. This ventilation drying device is characterized by having a discharge section consisting of valves arranged facing each other with a space interposed therebetween, and further having an exhaust port opened in the upper part of the tank body and a hot air supply port opened in the lower part of the tank body.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a tank body wrapped with a heat insulating material, and the bottom of the tank body 1 is formed into an inverted conical shape. A valve 2 (butterfly valve, ball valve, etc. with excellent gas sealing properties is suitable) is provided at the top of the tank body 1, and the upper part of the valve 2 is connected to a valve 3 (valve 2 Similarly, butterfly valves, ball valves, etc.) are arranged opposite to each other, and a water-containing solid material supply section 5 is provided above the valve 3. Further, a discharge part is provided at the bottom of the tank body 1, and a valve 6 (butterfly valve, ball valve, etc.) and a valve 7 are disposed facing each other in the discharge part with a space 8 interposed below the valve 6. The dry matter in the tank body 1 is discharged from the valve 7 when the valve is opened.

Further, an exhaust pipe 9 is opened in the upper part of the tank body 1, and a hot air supply port 10 is opened in the lower part of the tank body 1. The hot air supply pipe 10 is connected to an appropriate hot air supply source, and for example, as shown in the illustrated example, the air discharged from an aeration blower 11 that supplies aeration air to an aeration tank in a biological treatment process for organic wastewater is used. Piping can be used, and the exhaust pipe 9 is preferably connected to a diffuser in an aeration tank (not shown).

Note that the shape of the space 8 between the valves 6 and 7 at the bottom of the tank bottom 1 may be a straight cylinder shape, but in order to perform continuous drying, it is preferable to have a bulging shape as shown in the illustrated example. .

In addition, as for the structure of the inverted cone-shaped bottom of the tank body 1, an inverted cone-shaped member 13 (a plurality of ventilation holes may be provided) is provided so as to form a space 12 above the bottom surface, and this space The hot air supply pipe 10 is opened in the section 12,
If the center communicates with the inside of the tank 1, the supplied hot air (most of it) will flow upward from the center of the tank 1 and diffuse, so it will not reach the side wall inside the tank 1. This makes it possible to avoid undesirable drifting phenomena along the line.

In the figure, 14 indicates a packed bed of water-containing solids to be dried.

To explain its operation, a water-containing solid material to be dried, for example, a granular dehydrated cake with a water content of 75% or less, is put into the upper supply section 5, and a predetermined amount of cake is fed into the upper supply section 5 using a particle interface detector or a timer. After reaching the same amount, open the valve 3, drop the cake into the lower space 4 and close the valve 3, then open the valve 2 and let the cake fall into the tank 1 to form a layer with a thickness of about 200 to 1000 mm. A filling layer 14 is formed. Next, when hot air is supplied from the hot air supply pipe 10, the hot air flows upward into the packed bed 14.
The inside of the tank is ventilated, the cake is dried, and the exhaust gas with increased humidity is discharged from the exhaust pipe 9 to the outside of the tank. On the other hand, when the valve 6 is opened, the dried cake dried in the tank body 1 is ejected or falls into the space 8 due to air pressure (at this time, the valve 7 is closed), and when the valve 6 is closed and the valve 7 is opened. and is discharged outside the tank body 1.

In this way, the supply of water-containing solids and the discharge of dried materials are performed by alternately opening and closing the double valves arranged opposite each other, so even if high-pressure hot air is supplied, leakage to the outside of the tank is prevented, and the drying process is prevented. Discharging of materials is forced by hot air pressure, so there is no residual dry matter in the tank, and continuous operation can be easily performed.

Note that when this aerated drying device is used for drying water-containing solids generated during the treatment of organic wastewater such as sewage, human waste, and various industrial wastewaters, it is extremely energy-saving and advantageous.

In other words, a large amount of aeration air is supplied from a blower to an aeration tank for biological treatment, such as activated sludge treatment of organic wastewater. Conventionally, this blower simply supplies the air necessary for biological treatment. Only a single function was used. but,
As shown in the adiabatic compression theory of gases in thermodynamics, the temperature of the hot air discharged from the aeration blower is significantly higher than that of the blower suction air, reaching 60 to 80°C.

Therefore, the air discharged from the aeration blower 11 that supplies aeration air is transferred from the hot air supply pipe 10 to the tank body 1.
After the heat is used as a heat source for drying the water-containing solid material 14, the exhaust gas (air) that is cooled and exhausted from the exhaust pipe 9 is supplied to the diffuser in the aeration tank. Since the heat source for drying can be obtained at no cost, it is extremely energy saving, and the bad odor in the exhaust gas (air) exhausted from the exhaust pipe 9 is biologically deodorized in the aeration tank, so special deodorizing equipment and deodorizing equipment are used. Expenses become unnecessary.

[Effect of idea]

As described above, the present invention provides the following beneficial effects.

Even when using high-pressure hot air, which was conventionally considered to be unsuitable as a heat source for drying, there is no leakage, and water-containing solids can be continuously dried. There is less loss,
Improves heat utilization efficiency.

Since dry matter can be forcibly discharged by hot air pressure, there is no problem of dry matter remaining inside the tank.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Tank body, 2, 3, 6, 7... Valve, 4... Space part, 5... Supply part, 8... Space part, 9... Exhaust pipe, 10... Warm air supply pipe, 11 ... Aeration blower, 12 ... Space section, 13 ... Inverted conical member, 14
...Filled layer.

Claims (1)

[Claims for Utility Model Registration] (1) The bottom of the tank is formed into an inverted conical shape, and the top of the tank and the water-containing solids supply section above the tank are connected to each other via valves arranged opposite to each other with a space interposed therebetween. A discharge section consisting of valves connected to each other and arranged facing each other with a space interposed at the bottom of the tank body is provided, and an exhaust port is opened at the top of the tank body, and a hot air supply port is opened at the bottom of the tank body. ventilation drying equipment. (2) A request for utility model registration in which the inverted conical bottom of the tank has a double structure with a space interposed therebetween, and the hot air supply port is opened in the space to communicate with the inside of the tank. The ventilation drying device according to item 1. (3) Claim 1 of the utility model registration, which is that the warm air supply port is connected to the discharge port of an aeration blower, and the exhaust port is connected to the aeration tank.
The ventilation drying device according to item 1 or 2.