JPH0351038Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a horizontal drum-shaped heating chamber, in which rotating blades that transfer and heat sludge in the longitudinal direction of the heating chamber are moved by a drive device to rotate the rotary blades, which are axially directed in the longitudinal direction. The present invention relates to a sludge dryer that is rotatably provided around the heating chamber and has a supply path for supplying sol-like sludge and a discharge path for discharging gel-like sludge, which are connected to the heating chamber.

[Conventional technology]

Conventionally, as shown in FIG. 4A, the sol-like sludge S in the heating chamber 3 is stored in a sufficient thickness by the action of the gel-like sludge G that normally accumulates on the discharge path 7 side, It was configured to contact and heat the sol-like sludge S with the rotating blades 8 and the like.

[Problem that the invention attempts to solve]

However, if the accumulation range of the gelled sludge G narrows from the normal range toward the discharge channel 7 side due to an increase in the water content of the sol-like sludge from the supply channel 5, for example, the sol-like sludge S in the heating chamber 3 becomes There is a risk that the upper surface level will drop considerably as shown in Figure 4 (b), and the contact area between the rotating blade 8 and the sol-like sludge S will decrease significantly, leading to a noticeable decrease in heating capacity. There was room for.

The purpose of the present invention is to maintain a large contact area between the sol sludge and the rotating blades even if the range of gel sludge accumulation narrows from the normal area to the discharge path side, and to create a configuration for this purpose. The purpose is to make it so that it does not adversely affect drying when the gel sludge is deposited in a normal range.

[Means for solving the problem] The characteristic configuration of the present invention is that sol-like sludge is stored at a level higher than a set level in a heating chamber equipped with rotating blades for transferring and heating sludge. The movable weir for causing overflow is provided so as to be freely movable between an active position and a non-active position, and its effects are as follows.

[Effect] In other words, as shown in Figure 3A, gel sludge G
When the sol-like sludge S is accumulated in a normal range and the sol-like sludge S is stored in a sufficient thickness, the movable weir 16 is placed at a sufficiently low non-working position so that the transfer of the sol-like sludge S is carried out by the movable weir 16. Sludge can be dried efficiently without any negative effects.

As shown in Figure 3B, when the accumulation range of gel sludge G narrows from the normal area toward the discharge channel 7 side and there is a risk that the upper surface level of sol sludge S decreases abnormally, sol sludge A movable weir 16 is arranged at a position where the sludge sludge S overflows at a set level L or above, and the thickness of the sol-form sludge S is maintained to be sufficient to contact the rotating heating blade 8, thereby fully demonstrating the sludge drying ability. I can do it.

[Effect of idea]

As a result, the sludge drying process can now be carried out efficiently and thermally efficiently by always reliably exhibiting a sufficiently large drying capacity without being adversely affected by the properties of the sludge.

〔Example〕

Next, examples will be shown.

As shown in FIGS. 1 and 2, the jacket 1
A horizontal drum-shaped heating chamber 3 is formed by a casing 2 provided with A rotating shaft 9a is formed with a discharge path 7 through which the gelled sludge overflows from the other end in the longitudinal direction against a weir plate 19 whose height can be changed and is discharged to a collection conveyor 6, and a rotating shaft 9a has a large number of rotating blades 8 arranged in parallel. , 9b are installed side by side in the heating chamber 3. A fluid chamber 10 is formed in each of the rotating blades 8, and a heated fluid supply path 11 and a discharge path 12 connected to each of the fluid chambers 10 are formed in each of the rotating shafts 9a and 9b.
A drive device 13 consisting of a transmission 13b, etc.
The two rotating shafts 9a and 9b are interlocked so that they rotate in opposite directions, and a high temperature fluid supply device 14 such as a boiler is connected to the jacket 1 of the casing 2 through the supply pipe 1.
5a, and is also connected to the supply path 11 of both rotating shafts 9a, 9b by a supply pipe 15b.
At the same time, the sol-like sludge S continuously introduced from the supply channel 5 is transferred to the discharge channel 7 side while being stirred by the rotating blades 8 of both rotating shafts 9a and 9b.
The sludge is heated and dried by the high-temperature fluid supplied to the jacket 1 and the fluid chamber 10 and dried into a gel-like state, and the sludge is continuously collected from the discharge path 7. In addition, 15c is the jacket 1 and the fluid chamber 10.
It is a fluid discharge path from.

A movable weir 16 is provided in a portion of the heating chamber 3 that accommodates the sol-like sludge S so that it can be slid up and down by a drive device 17, so that the sol-like sludge S is brought into sufficient contact with the rotary blades 8 at a setting level L or higher. The movable weir 16 is configured to be movable between an active position for causing overflow and a non-active position below from the inner bottom surface of the heating chamber 3. 18 is a case that accommodates the movable weir 16 in a non-operating position.

A sensor 20, such as a capacitive type, for detecting whether the upper surface level of the sol-form sludge S in the heating chamber 3 is equal to or higher than the set level L is provided on the upstream side of the movable weir 16, and the A controller 22 is provided to automatically operate the drive device 17 based on the information,
As shown in FIG. 3A, when the sludge level detected by the sensor 20 is equal to or higher than the set level L, the movable weir 16 is set to the non-operating position, and as shown in FIG. 3B, the sludge level detected by the sensor 20 is When the level is less than the set level L, the movable weir 16 is placed in the operating position for a set time, so that a reduction in heating capacity due to a decrease in the thickness of the sol-like sludge S can be prevented.

[Another example]

Next, another example will be shown.

To form the heating chamber 3, the shape can be freely changed, such as making it almost cylindrical when there is only one rotating shaft 9a, 9b equipped with the rotating blade 8, and various other configuration changes can be made in the specific structure. is possible.

When forming the rotary vane 8, the shape can be freely changed, for example, by making it into a continuous screw shape, and the specific configuration of the driving device 13 for the rotary vane 8 can be changed in various ways.

The configuration in which the movable weir 16 is movably mounted and the configuration in which it is moved can be changed as appropriate. For example, the movable weir 16 may be configured to be moved manually, or the movable weir 16 may be moved continuously or at a set level in accordance with the detection level by the sensor 20. It may be configured to automatically adjust the level in multiple stages, and the drive device 17 for the movable weir 16
For example, a torque motor, a hydraulic cylinder, or any other suitable device can be selected.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention,
FIG. 1 is a schematic sectional view of the dryer, FIG. 2 is a sectional view taken along the line -- in FIG. 1, and FIGS. 3A and 3B are explanatory views of the distribution of sol-like and gel-like sludge in the heating chamber, respectively. FIGS. 4A and 4B are explanatory diagrams of a conventional example. 3... Heating chamber, 5... Supply path, 7... Discharge path,
8... Rotating vane, 13... Drive device, L... Setting level, S... Sol sludge, G... Gel sludge.

Claims (1)

[Scope of utility model registration request] A rotary blade 8 that transfers and heats sludge in the longitudinal direction of the horizontal drum-shaped heating chamber 3 is provided rotatably around an axis extending in the longitudinal direction by a drive device 13, and supplies sol-like sludge S. The supply path 5 and the discharge path 7 for discharging the gelled sludge G,
A movable weir 16 that is a sludge dryer formed in communication with the heating chamber 3 and causes the sol-form sludge S to overflow at a set level L or higher in a portion of the heating chamber 3 that accommodates the sol-form sludge S. A sludge dryer that can be moved freely between working and non-working positions.