JPS6238604B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an organic sludge treatment apparatus that integrates a drying chamber and an incineration chamber.

When incinerating organic sludge such as sewage or human waste that has been dehydrated using a fluidized bed incinerator, the high water content of the sludge makes it difficult for the sludge to flow, so the incinerator must be large and the amount of air for fluidization must be increased. Therefore, the device becomes larger. Therefore, conventional equipment has been devised that dehydrates the sludge, dries it, and sends it to the incinerator, but since the drying equipment and incinerator are separate,
In addition to poor thermal efficiency, the equipment is also complex and large.

An object of the present invention is to provide a compact organic sludge treatment apparatus that performs drying and incineration in one furnace and has high thermal efficiency.

In order to achieve this purpose, the present invention includes a drying chamber into which dehydrated organic sludge is sent, an incineration chamber into which sludge from the drying room is sent, and air supply to the drying room and exhaust air from the incineration chamber. A heat exchange section for exchanging heat with the incineration chamber is formed in the furnace, and the drying chamber is located continuously above the incineration section via the heat exchange section, and a jet air duct is provided from the top of the drying chamber to the bottom of the incineration chamber. A first overflow pipe for dropping sludge was provided to communicate the incineration chamber and drying chamber through the heat exchange section, and a second overflow pipe for removing ash was provided below the furnace from the incineration chamber. .

In the organic sludge treatment apparatus configured in this manner, when dehydrated sludge is sent into the drying chamber, the sludge is fluidized and dried by the supply air superheated in the heat exchange section. During this fluidized drying, the sludge gradually dries, becomes smaller and lighter, moves to the upper part of the drying chamber, and falls into the incineration chamber from the first overflow pipe.

On the other hand, exhaust gas (supply air) that absorbs water from the sludge and reaches the upper part of the drying chamber passes through the air duct and is ejected from the lower part of the incineration chamber into the interior. This eruption causes
The sludge from the first overflow pipe flows and is incinerated by a burner or the like, and the incinerated sludge ash is discharged out of the furnace from the second overflow pipe.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the figure, the processing apparatus A of the present invention consists of a drying chamber 2, an incineration chamber 3, and a heat exchange section 4 formed in a furnace 1; A drying chamber 2 is located continuously above.

The drying chamber 2 is equipped with a sludge feeding device 10, which is composed of a screw conveyor 11 and a feeder 12 that supplies the sludge that has been dehydrated to the screw conveyor 11. 11 causes the sludge to be sent to the lower part of the drying chamber 2.

The drying chamber 2 and the heat exchange section 4 are partitioned by a perforated plate 5, and the heat exchange section 4 has one end connected to an air supply duct 24 via a dispersion pipe 23 and the other end communicated with the drying chamber 2. It is composed of a plurality of heat exchange tubes 22, and in the heat exchange section 4, the supply air sent by the blower and the exhaust gas from the incineration chamber 3 exchange heat,
Hot air blows into the drying chamber 2. The heat exchange section 4 also includes a plurality of first
An overflow pipe 25 is provided through which dried sludge from the drying chamber 2 falls into the incineration chamber 3 .

On the other hand, the upper part of the drying chamber 2 and the lower part of the incineration chamber 3 are communicated with each other by an air duct 30, and the exhaust gas from the drying chamber 2 flows into the incineration chamber 3 through this air duct 30, and the sludge is removed from the grate 33. This becomes the jet air that flows above. The incineration chamber 3 is provided with a plurality of second overflow pipes 31. One end (lower end) of the second overflow pipe 31 faces the incinerated ash conveyor 32 outside the furnace 1, and the other end (upper end) opens. The opening projects into the incineration chamber 3 and faces upward. Note that the overflow pipes 25 and 31 are set so as not to be located on the same straight line, so that falling sludge does not directly enter the ash removal pipe 31. In the figure, 20 is an exhaust duct that communicates with the incineration chamber 3 via the heat exchanger 4, and 34 is a burner.

This embodiment is constructed as described above, and its operation will be explained next.

Now, when this treatment device is in operation, when the dehydrated sludge is sent to the drying chamber 2 by the screw conveyor 11, the heated supply air (usually about 400 to 500 ℃), the sludge is fluidized and dried. At this time, since the sludge has large particles, vigorous flow is not required and is not required. The flowing sludge gradually dries and becomes smaller and lighter in particle size, moves above the drying chamber 2, and when it reaches the upper end of the overflow pipe 25, falls through the first overflow pipe 25 into the incineration chamber 3. do.

On the other hand, the exhaust gas (usually 150 to 200°C) that has absorbed water from the sludge and reached the upper part of the drying chamber 2 passes through the air duct 30 and is ejected from the lower part of the incineration chamber 3 into the interior. This ejection of exhaust gas from the drying chamber 2 causes the sludge that has fallen from the first overflow pipe 25 to flow, and the sludge is incinerated by the burner 34 .
The incinerated sludge ash falls onto the conveyor 32 from the second overflow pipe 31 and is conveyed to a desired location.

Note that if the drying chamber 2, incineration chamber 3, and heat exchange section 4 are designed so that the X-X cross section in FIG. It can change.

As described above, according to the organic sludge treatment apparatus of the present invention, the drying chamber, the incineration chamber, and the heat exchange section are integrally formed in the furnace, and the heating of the supply air that becomes the jet air of the drying chamber is carried out in the incineration chamber. Since this is done through heat exchange with the exhaust gas from the exhaust gas, effective use of heat is achieved and thermal efficiency is high. Furthermore, since the dried exhaust gas after the drying process is burned as a jet in the incineration chamber, the foul odor of the dried exhaust gas is eliminated and no odor treatment device is required. Furthermore, since drying and incineration are carried out using a fluidized bed method, high moisture sludge can be incinerated efficiently.

In addition, an incinerator, a heat exchange section, and a drying chamber are installed in the upward direction in the furnace, and the sludge (ash) is dropped from the drying chamber to the incineration chamber through the first and second overflow pipes. Since the sludge is moved from the incineration chamber to the outside, there is no need for special equipment such as conveyors to move the sludge between the two devices or to the outside, unlike conventional systems in which the drying device and incineration device are separate. Furthermore, since the incineration chamber, heat exchange section, and drying chamber are connected, the entire processing device becomes compact.

[Brief explanation of the drawing]

FIG. 1 is a schematic cutaway front view of an embodiment of the organic sludge treatment apparatus of the present invention, and FIG. 2 is a cutaway plan view of the heat exchange section of FIG. 1. DESCRIPTION OF SYMBOLS 1... Furnace, 2... Drying chamber, 3... Incineration chamber, 4... Heat exchange part, 25... First overflow pipe, 30... Air duct, 31... Second overflow pipe.

Claims (1)

[Claims] 1. A drying chamber 2 into which dehydrated organic sludge is sent, an incineration chamber 3 into which sludge from the drying chamber 2 is sent, and a heat exchanger that exchanges heat between the air supplied to the drying chamber 2 and the exhaust air from the incineration chamber 3. The drying chamber 2 is continuously located above the incineration chamber 3 via the heat exchange section 4, and a jet air duct is provided from the upper part of the drying chamber 2 to the lower part of the incineration chamber 3. 30, and a first overflow pipe 25 for dropping sludge that communicates the incineration chamber 3 and the drying chamber 2 through the heat exchange section 4,
An organic sludge treatment device characterized in that a second overflow pipe 31 for removing ash is provided below the furnace 1 from inside the incineration chamber 3.