JPH08126900A - Sludge dryer - Google Patents

Abstract

(57) [Summary] [Structure] The sludge drying device of the present invention comprises a plurality of centrifugal thin film dryers 1A and 1B which are installed in parallel with each other to dry the inflowing sludge 10 by hot air and to discharge the sludge, 1A,
A bleed air blower 7 connected to the bleed air outlets 2A, 2B of 1B for exhausting the treated air after drying the sludge 10, and a bleed air blower 7 and the centrifugal thin film dryers 1A, 1B installed to discharge the treated air. Manual dampers 3A and 3B for presetting capacity
And automatic dampers 4A, 4B which are connected in series to the manual dampers 3A, 3B and are opened halfway when the centrifugal thin film dryers 1A, 1B are started up by an open / close control signal from the outside and then fully opened thereafter. Is characterized by. According to the present invention, the operation of the centrifugal thin film dryer can be stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge drying device for sludge generated in a sewage treatment plant or a general wastewater treatment plant.

[0002]

2. Description of the Related Art Conventionally, in a sludge dryer having two or more centrifugal thin film dryers, the pressure loss generated in the extraction system is different when sludge is being supplied to the centrifugal thin film dryer and when it is not. Therefore, when it is necessary to change the number of operating centrifugal thin film dryers, an extraction blower is provided for each centrifugal thin film dryer in order to stabilize the extraction air amount.

[0003]

Therefore, when a large number of centrifugal thin film dryers are installed, there is a problem in that the extraction blowers must be installed for that number.

Therefore, the present invention provides a sludge drying device capable of extracting air with two extraction blowers for two or more centrifugal thin film dryers.

[0005]

The sludge drying apparatus of the present invention comprises a plurality of centrifugal thin film dryers which are installed in parallel with each other and dry the inflowing sludge by hot air drying, and a hot air outlet side of the centrifugal thin film dryer. Connected to the air extraction blower that exhausts the treated air after drying the sludge, a manual damper installed between the extraction blower and the centrifugal thin film dryer to preset the discharge capacity of the treated air, and in series with the manual damper. It is characterized in that it is provided with an automatic damper which is connected to the semi-open type and is opened halfway when the centrifugal thin-film dryer is started up by an open / close control signal from the outside and then fully opened. Further, in the sludge drying device according to claim 2, the operation of the extraction blower is of a rotation speed adjusting type, and an extraction blower outlet pressure detector is provided at a stage subsequent to the extraction blower, and the extraction blower outlet detected by the extraction blower outlet pressure detector is provided. It is characterized in that the rotation speed of the extraction blower is adjusted so that the detected pressure value is within a predetermined extraction blower outlet pressure set value. In the sludge drying device according to claim 3, a dryer outlet pressure detector is provided on the hot air outlet side of the centrifugal thin film dryer, and the dryer outlet pressure detection value detected by the dryer outlet pressure detector is predetermined. The feature is that the opening / closing degree of the automatic damper is adjusted so that it is within the dryer outlet pressure set value.
Further, in the sludge drying device according to claim 4, a bleed air blower inlet pressure detector is provided in front of the bleed air blower, and the bleed air blower inlet pressure detection value detected by the bleed air blower inlet pressure detector is a predetermined bleed air blower inlet pressure. The feature is that the rotation speed of the extraction blower is adjusted so as to be within the set value.

[0006]

In the sludge drying apparatus of the present invention, a plurality of centrifugal thin film dryers are installed in parallel with each other, the inflowing sludge is dried by hot air and discharged, and an extraction blower is connected to the sludge outlet side of the centrifugal thin film dryer. Exhaust the treated air after drying the sludge and set a manual damper between the extraction blower and the centrifugal thin film dryer to set the discharge capacity of the treated air in advance and connect the automatic damper in series with the manual damper. It is characterized in that the centrifugal thin film dryer is half-opened when it is started up by an open / close control signal from the outside and then fully opened. In addition, claim 2
In the sludge drying device described in, the operation of the extraction blower is a rotation speed adjustment type, the extraction blower outlet pressure detector is provided in the subsequent stage of the extraction blower, and the extraction blower outlet pressure detection value detected by the extraction blower outlet pressure detector is set in advance. It is characterized in that the rotation speed of the extraction blower is adjusted so as to be within the set extraction air blower outlet pressure setting value. In the sludge drying device according to claim 3, a dryer outlet pressure detector is provided on the hot air outlet side of the centrifugal thin film dryer, and the dryer outlet pressure detection value detected by the dryer outlet pressure detector is predetermined. The feature is that the opening / closing degree of the automatic damper is adjusted so that it is within the dryer outlet pressure set value. Further, in the sludge drying device according to claim 4, a bleed air blower inlet pressure detector is provided in front of the bleed air blower, and the bleed air blower inlet pressure detection value detected by the bleed air blower inlet pressure detector is a predetermined bleed air blower inlet pressure. The feature is that the rotation speed of the extraction blower is adjusted so as to be within the set value.

[0007]

EXAMPLES Next, examples of the sludge drying apparatus of the present invention will be described. In FIG. 1, centrifugal thin film dryers 1A and 1B are installed in parallel with each other and dry the inflowing sludge 10 and discharge it. The extraction blower 7 is connected to the extraction outlets 2A, 2B on the hot air outlet side of the centrifugal thin film dryers 1A, 1B and discharges the treated air after drying the sludge 10. Manual damper 3A, 3
B is the extraction blower 7 and the centrifugal thin film dryers 1A and 1B, respectively.
It is installed between and to preset the discharge capacity of the processing air. The automatic dampers 4A and 4B are the manual dampers 3A and 4A, respectively.
The centrifugal thin film dryers 1A and 1B are connected to each other in series and half opened when the centrifugal thin film dryers 1A and 1B are started up, and fully opened after that, and fully opened when the centrifugal thin film dryers 1A and 1B are not used. The automatic dampers 4A and 4B are connected to the extraction pipe 5, and a scrubber 6 is connected to the extraction pipe 5 in front of the extraction blower 7 to cool the discharged air and wash the exhausted air.

FIG. 2 is a block diagram of the sludge drying device according to the second aspect of the present invention, in which the operation of the extraction blower 7 is a rotation speed adjustment type, and the extraction blower outlet pressure detector 1 is provided at the subsequent stage of the extraction blower 7.
1 is provided, and the rotation speed of the extraction blower 7 is adjusted by the control device 8 so that the detected value of the extraction blower outlet pressure detected by the extraction blower outlet pressure detector 11 is within the predetermined extraction blower outlet pressure set value.

FIG. 3 is a block diagram of a sludge drying device according to a third aspect of the present invention, in which a dryer outlet pressure detector 9 is provided on the hot air outlet side of the centrifugal thin film dryer 1A, and the dryer outlet pressure detector 9 is provided.
The opening / closing degree of the automatic damper 4A is adjusted by the control device 8 so that the dryer outlet pressure detection value detected by A is within a predetermined dryer outlet pressure set value.

FIG. 4 is a block diagram of the sludge dryer according to the fourth aspect of the present invention, in which a bleeder blower inlet pressure detector 9 is provided in front of the bleeder blower 7, and a bleeder blower inlet detected by the bleeder blower inlet pressure detector 9 is detected. The rotation speed of the extraction blower 7 is adjusted by the control device 8 so that the detected pressure value is within the predetermined extraction blower inlet pressure setting value.

That is, as shown in FIG. 1, a manual damper 3 is provided at each of the extraction outlets 2A and 2B of the centrifugal thin film dryers 1A and 1B, and automatic dampers 4A and 4 capable of intermediate opening are provided on the downstream side thereof.
B is provided, and a scrubber 6 and an extraction block 7 are provided in the combined extraction pipe 5.

Next, referring to FIG. 2, the centrifugal thin film dryer 1
A manual damper 3A is designed at the extraction outlet 2A of, and the extraction pipes are joined to each of the centrifugal thin film dryers 1A and 1B on the downstream side,
A scrubber 6 and a bleed block 7 are provided in the bleed pipe 5 that merges with the automatic dampers 4A and 4B capable of intermediate opening, and the bleed blower 7 depends on the number of operating centrifugal thin film dryers 1A and 1B.
A control device 8 for controlling the number of rotations is provided.

In FIG. 3, a manual damper 3A is provided at the extraction outlet 2A of the centrifugal thin film dryer 1A, an automatic damper 4A capable of intermediate opening is provided at the downstream side thereof, and the combined extraction pipe 5 is joined.
The scrubber 6 and the extraction blower 7 are designed and the extraction outlet 2
A pressure gauge 9A is installed between A and the manual damper 3A, and
A control device 8 for adjusting the opening degree of the automatic damper 4A based on the pressure gauge signal is provided.

In FIG. 4, a manual damper 3A is provided at the extraction outlet 2A of the centrifugal thin film dryer 1A, an automatic damper 4A with an intermediate opening degree is provided at the downstream side thereof, and the combined extraction pipe 5 is joined.
The scrubber 6 and the bleeding blower 7 are provided, the pressure gauge 9 is installed on the suction side of the bleeding blower 7, and a control device for adjusting the rotation speed of the bleeding blower 7 is provided by the pressure gauge signal. To do.

The centrifugal thin film dryer 1 having the above structure
The sludge 10 is dried by A to be dried sludge. on the other hand,
Evaporated water generated during drying is sent to the scrubber 6 through the extraction outlet 2A, cooled and dehumidified, and sent out of the system such as a deodorizing device by the extraction blower 7.

Since the extraction air volume of the centrifugal thin film dryer 1A greatly affects the drying function, manual dampers 3A and 3B are provided to balance the extraction air volumes of the centrifugal thin film dryers 1A and 1B. In addition, when there are multiple centrifugal thin film dryers 1A and 1B, and any one of them is in suspension, the pressure loss of the extraction system is smaller than that of the centrifugal thin film dryer in operation. However, the amount of air extracted from the centrifugal thin-film dryer during operation decreases, and the drying capacity decreases. Therefore, automatic dampers 4A and 4B for adjusting the amount of air extracted are installed, and the centrifugal force during suspension is reduced. The amount of air extracted from the thin film dryer can be controlled.

In FIG. 2, centrifugal thin film dryers 1A and 1B are provided.
One automatic damper 4 is installed for each of the two units, and the operation is controlled for each of the two units. Furthermore, since the total amount of extracted air changes depending on the operating number of the centrifugal thin film dryers 1A and 1B, the rotation speed of the extracting blower 7 can be controlled by the inverter according to the operating number.

In FIG. 3, the bleed pressure is detected by a pressure gauge 9A provided at the bleed outlet 2A, and the bleed pressure is kept constant by adjusting the opening of the automatic damper 4A.

In FIG. 4, the pressure gauge 9 provided on the suction side of the extraction blower 7 detects the extraction pressure, adjusts the number of revolutions of the extraction blower 7, and keeps the extraction pressure constant. There is.

In FIG. 2, four centrifugal thin film dryers are each provided with a manual damper, and two are provided with an automatic damper 4A. A scrubber 6 is installed in the extraction pipe 5.
And one bleed blower 7 is installed. Further, the extraction blower 7 is driven by an inverter, and the flow rate controller 11 is installed on the discharge side of the extraction blower 7.

The sludge 10 is dried by the centrifugal thin film dryer 1A to be dried sludge. On the other hand, evaporated water generated during drying is sent from the extraction outlet 2A to the scrubber 6, cooled and dehumidified, and sent to an external device such as a deodorizing device by the extraction blower 7. The manual damper 3A provided at the extraction outlet 2A of the centrifugal thin film dryer 1A makes the extraction air amounts of the four centrifugal thin film dryers uniform. In addition, since this sludge drying device is designed to collectively control the operation of two centrifugal thin film dryers, one automatic damper 4A is provided for every two centrifugal thin dryers.
It is installed at the rate of a stand.

The automatic damper 4A supplies the sludge to the centrifugal thin film dryer which is in the drying step and the centrifugal thin film dryer which is not supplied with the sludge and is in the resting state or the centrifugal thin film dryer which is starting up. It's designed to be balanced. Further, the number of revolutions of the extraction blower 7 can be controlled by the number of operating centrifugal thin film dryers 1A so that the extraction air amount per one centrifugal thin film dryer can be kept constant. At this time, a flow rate controller 11 is installed in this embodiment to check whether or not the amount of extracted air per centrifugal thin film dryer is at a set value.

According to this embodiment, the centrifugal thin film dryer 1 is conventionally used.
Although it was necessary to install an extraction blower for each stand, only one extraction blower is required for four centrifugal thin film dryers, and it is possible to provide an efficient sludge drying device that saves space.

In this embodiment, an extraction system may be constituted by a scrubber and an extraction blower, or a condenser may be used instead of the scrubber, and a vacuum pump or an ejector may be used instead of the blower.

[0025]

According to the present invention, the extraction system of a centrifugal thin film dryer can be simplified and stable extraction can be performed, and an efficient sludge drying device can be provided.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a sludge drying device showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a sludge drying device showing an embodiment of claim 2.

FIG. 3 is a configuration diagram of a sludge drying device showing an embodiment of claim 3.

FIG. 4 is a configuration diagram of a sludge drying device showing an embodiment of claim 4;

[Explanation of symbols]

 1A, 1B1 ... Centrifugal thin film dryer 3A, 3B ... Manual damper 4A, 4B ... Automatic damper 7 ... Ventilation blower 8 ... Control device 9 ... Pressure gauge

Claims (4)

[Claims] 1. A plurality of centrifugal thin film dryers which are installed in parallel with each other and dry with hot air of discharged sludge and discharge, and after drying the sludge by being connected to hot air outlets of these centrifugal thin film dryers. A blower for exhausting the treated air, a manual damper installed between the extracted blower and the centrifugal thin film dryer to preset the discharge capacity of the treated air, and connected in series to the manual damper to externally A sludge drying device comprising an automatic damper which is half-opened when the centrifugal thin-film dryer is started up and half-opened thereafter by the opening / closing control signal from 2. The operation of the bleed air blower is a rotation speed adjustment type, and a bleed air blower outlet pressure detector is provided at a subsequent stage of the bleed air blower, and a bleed air blower outlet pressure detection value detected by the bleed air blower outlet pressure detector is previously set. A sludge drying device, characterized in that the rotation speed of the extraction blower is adjusted so as to be within a set outlet pressure setting value of the extraction blower. 3. The dryer outlet pressure detector is provided on the hot air outlet side of the centrifugal thin film dryer, and the dryer outlet pressure detection value detected by the dryer outlet pressure detector is a predetermined dryer outlet pressure set value. A sludge drying device, characterized in that the opening / closing degree of the automatic damper is adjusted so as to be inside. 4. A bleed air blower inlet pressure detector is provided in the preceding stage of the bleed air blower so that the bleed air blower inlet pressure detection value detected by the bleed air blower inlet pressure detector is within a predetermined bleed air blower inlet pressure set value. A sludge drying device, characterized in that the rotation speed of the extraction blower is adjusted.