JPS6236051Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides rotating blades for transferring sludge in the longitudinal direction of the horizontal drum-shaped heating chamber, which are rotatable around an axis in the longitudinal direction by a drive device. A supply channel for supplying sludge and a discharge channel for discharging gel-like sludge are formed in communication with the heating chamber, and various sludges such as water treatment sludge such as sewage sludge and industrial waste sludge are continuously treated. Regarding dryers.

When drying sludge using the dryer described above, in order to fully utilize the dryer's ability and obtain appropriately dried and finely divided gel-like sludge,
As shown in FIG. 3A, it is necessary to form a weir of gel-like sludge over an appropriate area on the discharge path side of the heating chamber.

On the other hand, in conventional dryers, it is impossible to detect the distribution of gelled sludge inside the heating chamber without visually inspecting the interior, and the only way to get an idea is by looking at the state of the gelled sludge collected from the discharge channel. Ta.
However, in reality, as the amount and moisture content of the gelled sludge supplied to the heating chamber increase, the weir of the gelled sludge G moves toward the discharge path 7, as shown in FIG.
Sludge that has not been dried sufficiently or sludge that is too large is discharged, and the amount of sludge in the heating chamber 3 decreases, reducing the processing capacity.
As shown in Figure C, the weir of gelled sludge G is connected to the supply channel 5.
If the gelled sludge G moves to the side, it is easy to cause problems such as overdrying and excessive fragmentation by the rotating blades 8, such as pulverization. The disadvantage was that it took a long time to restore the drying process, and the amount of drying was significantly reduced during that time.

In view of the above-mentioned circumstances, an object of the present invention is to enable reliable detection of the gelled sludge distribution state within the heating chamber.

The characteristic structure of the dryer according to the present invention is that contact or non-contact sensors are arranged in parallel in the longitudinal direction of the heating chamber to detect the upper surface level of sludge in the horizontal drum-shaped heating chamber. The purpose of this invention is to provide a device for determining the distribution state of gel-like sludge, and its effects are as follows.

In other words, as shown in Figure 3 A to C, the sludge in the heating chamber is higher on the sol-like sludge S side of the gel-like sludge G, and it depends on which sensor detects the higher sludge top surface. Therefore, it becomes clear which range the gelled sludge G exists in. By automatically making such a judgment using the determination device, it is possible to determine whether the gelled sludge distribution state in the heating chamber 3 is appropriate. It is possible to know for sure whether it is there or not.

Therefore, for example, the gelled sludge distribution state can be determined manually based on a gelled sludge distribution display device operated by a determination device, or automatically by a controller linked to the determination device. operations to restore the sludge to its proper state, such as increasing or decreasing the amount of sol-like sludge input, changing or reversing the speed of the rotary blade for sludge transfer, changing the inclination angle of the casing that forms the heating chamber, or changing the supply position of the sol-like sludge. By doing the following, it is now possible to easily and reliably maintain an appropriate gel-like sludge distribution state, and while making full use of the dryer's ability, the gel-like sludge is properly dried and finely divided. It has become possible to reliably and easily continue good operation that yields sludge over a long period of time.

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. . Axis 9a, 9
A drive device 1 is formed in each of b and includes an electric motor 13a, a transmission 13b that can be freely switched between forward and reverse directions, and the like.
3 is interlocked with two rotating shafts 9a and 9b 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 a supply pipe 15a, and both rotating shafts 9a ，
Connected to the supply path 11 of 9b by a supply pipe 15b,
As a result, the sol-like sludge continuously introduced from the supply path 5 is transferred to the discharge path 7 side while being stirred by the rotating blades 8 of the rotating shafts 9a and 9b that rotate normally, and the jacket 1 and the fluid are The sludge is heated and dried by the high-temperature fluid supplied to the chamber 10 and dried into a gel-like state, and the sludge is continuously collected from the discharge path 7. Note that 16 is a fluid discharge path from the jacket 1 and the fluid chamber 10.

A large number of contact sensors 17 for detecting the upper surface level of sludge in the heating chamber 3 are arranged in parallel in the longitudinal direction of the heating chamber, and based on the information from these sensors 17, the distribution state of gelled sludge in the heating chamber 3 is determined as follows: A device 25 is provided for determining whether the state is proper as shown in FIG. 3A or is in a defective state as shown in FIG.
When the weir of gelatinous sludge G moves toward the discharge path 7 as shown in Figure B, the transmission 1 rotates the rotary blades 8 in the opposite direction.
3b is automatically operated, and when the weir of gelatinous sludge G moves toward the supply path 5 side as shown in FIG.
A controller 18 is provided to automatically operate the controller 18, so that the proper gelled sludge distribution state shown in FIG. 3A is automatically maintained. In addition, the determination device 2
A suitable type of display device 26 operated by the heating chamber 3 is provided so that the state of gel sludge distribution within the heating chamber 3 can be seen at a glance.

In other words, if the condition shown in Fig. 3B occurs, the gel sludge G may be discharged without being sufficiently dried, the sol sludge S may flow into the discharge channel 7, or the gel sludge G may form large clumps due to insufficient drying. However, if the gelatinous sludge G becomes too dry and is shredded by the rotary blades 8, it becomes fine powder. The system is configured to automatically prevent such inconvenient situations, and is also configured to easily and reliably determine whether or not the vehicle is operating properly.

To configure the sensor 17, as shown in FIGS. 2 and 4, a pressure receiving plate 17b for sludge is attached to a bracket 17a fixed to the casing 2.
It is mounted so that it can swing freely using pins 17c that are substantially parallel to the rotating shafts 9a and 9b, and that it assumes a substantially vertical posture due to its own weight. The detection part 17e, which is bent to work well and linked to the pressure receiving plate 17b by a wire 17d, is connected to the heating chamber 3.
It is provided outside the pressure receiving plate 17b and is configured to detect the sludge upper surface level based on the swing angle of the pressure receiving plate 17b.

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.

The shape of the rotary vanes 8 can be freely changed, for example to a continuous spiral shape, and the specific configuration of the drive device 13 for the rotary vanes 8 can be freely changed in various ways.

To configure the sensor 17 for detecting the upper surface level of sludge, for example, the detection section 17e may be of a limit switch type, a proximity switch type, a foot switch type, a variable resistance type, an induced current type, or a light projection type or an ultrasonic projection type. Various other configuration changes are possible, such as a non-contact configuration.

Various changes can be made in how the information from the device 25 for determining the gelled sludge distribution state is used. For example, by simply adding the display device 26, the operation of the rotary vane transmission 13b, the casing 2 Countermeasure operations such as operating a device to change the inclination angle of the heating chamber 3 and operating a device to change the position of supplying sol-form sludge to the heating chamber 3 may be performed manually, or these countermeasure operations may be performed independently using a controller. It may be carried out either by itself or by a suitable combination.

The method and specific structure for heating the sludge in the heating chamber 3 can be changed as appropriate depending on the properties of the sludge, the installation status of the dryer, and the like.

[Brief explanation of the drawing]

Figure 1 is a schematic vertical cross-sectional view of the dryer, Figure 2 is the
3A to 3C are explanatory diagrams of the gelled sludge distribution state in the heating chamber, respectively, and FIG. 4 is a view taken along the - line in FIG. 2. 3... Heating chamber, 5... Supply path, 7... Discharge path,
8... Rotating vane, 13... Drive device, 17... Sensor, 25... Judgment device, S... Sol-like sludge, G... Gel-like sludge.

Claims (1)

[Scope of utility model registration request] In the horizontal drum-shaped heating chamber 3, a rotary blade 8 for transferring sludge in the longitudinal direction is provided rotatably around an axis in the longitudinal direction by a drive device 13, and a supply path 5 for supplying the sol-like sludge S. , and the discharge passage 7 for discharging the gelled sludge G is connected to the heating chamber 3.
A sludge dryer formed in communication with a sludge dryer, in which sensors 17 for detecting the upper surface level of sludge S and G in the heating chamber 3 are arranged in parallel in the longitudinal direction of the heating chamber,
A device 25 that determines the gelled sludge distribution state within the heating chamber 3 based on information from the sensors 17
A sludge dryer equipped with