JPH0412000A - System for transporting dehydrated sludge under pressure through pipeline - Google Patents

Abstract

PURPOSE:To smoothly transport dehydrated sludge to an incinerator, etc., by providing a sludge transporting main pipe for collecting plural drain pipes and connecting the pipes at the initial and intermediate points, a header connected to the plural sludge transporting main pipes and extending to the incinerator, etc. CONSTITUTION:A specified time schedule is assigned to operate a controller 300, a solenoid valve 310 corresponding to the operation is opened, and compressed air is blown in from the corresponding ejector 140. A pressurizing device 100 for the dehydrator of the corresponding group is simultaneously opened, and dehydrated sludge is sent to a sludge collecting main pipe 130 through a check valve 110 and a discharge and feed pipe 120. The dehydrated sludge in the main pipe 130 forms a concd. plug flow by the compressed air continuously blown in from the ejector 140, smoothly flows downward in the header and is transported to an incinerator through a header 160.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pipe pumping system for transporting dehydrated sludge produced from a dehydrator in a sewage treatment plant or the like to a remote incinerator or the like.

[Conventional technology] Conventionally, in sewage treatment plants, the sewage sludge (dehydrated sludge) dehydrated by 10 to several dozen dehydrators is incinerated in the next process, such as an incinerator. Due to this, the dehydrator and incinerator were not necessarily located close to each other, and the incinerator was installed in a remote location quite far away from the dehydrator, and transport between them was generally carried out using a combination of belt conveyors. .

FIG. 3 is a belt conveyor layout system diagram showing one example of this, and in this conventional example, the dewatering machine LA.

The dehydrated sludge from IB, IC, and ID is collected on the chute IO by the belt conveyor 20, and similarly, the sludge is transferred to the chute 2A.

2B, 2C, 2D dehydrator groups, 3A to 3D dehydrator groups,
The sludge from the dehydrator groups 4A to 4D is also connected to the chute 10, collected on the belt conveyor 30 that connects these chutes 10 and 10, and then connected to the belt conveyor 40 and belt conveyor 50 at the end of the belt conveyor 30 to be transported remotely. Dehydrated sludge was being transported to incinerator 60 on the ground.

[Problems to be Solved by the Invention] However, when dehydrated sludge is transported using a belt conveyor, for example, even if a cover is provided on the belt conveyor, the odor leaks to the outside, causing not only the inside of the treatment plant but also the residences around the treatment plant. There were problems such as not only destroying the local living environment, but also contaminating the inside of the treatment plant and incurring a great deal of labor and expense to keep the surrounding area clean.

In addition, in order to efficiently transport dehydrated sludge from multiple dehydrators to the destination using fewer belt conveyors, for example, if a belt conveyor arrangement such as the embodiment shown in Fig. 3 is adopted, continuous operation can be achieved. In this case, the belt conveyor 30 is 4 times the transport capacity of the belt conveyor 20 (8 times the dewatering function), and the maximum transport capacity of the belt conveyor 40 and the belt conveyor 50 is 3002 times the belt conveyor (8 times the dehydration function).
16 times the dewatering function), and the equipment cost for the belt conveyor becomes excessive. On the other hand, considering that the dewatering machine can be operated intermittently to some extent, if we try to adopt intermittent operation of the belt conveyor and use a belt conveyor with a small transport capacity, the operation of the belt conveyor will stop for the discharge amount of each dehydrator. It has been extremely complex and difficult to control the transport capacity within its transport capacity, and has little practicality.

[Means for Solving the Problems] In order to simultaneously solve the above problems, the apparatus of the present invention collects dehydrated sludge obtained from a plurality of dehydrators and transfers it to the next process separated from the dehydrators. A transfer means for transporting to an incinerator or the like, comprising a pressurizing device and a discharge pipe on the discharge side of the dehydrator,
A slurry main pipe is provided that collects a plurality of the discharge pipes and connects them at a starting point and an intermediate point, and a collecting main pipe that is connected to the plurality of mud transport pipes and extends to the incinerator, etc. an ejector for feeding compressed air into the slurry main pipe immediately after the starting point of the slurry main pipe, and a check valve immediately before the intermediate point of the slurry main pipe; This is a dehydrated sludge pipe pumping system that is equipped with an electromagnetic on-off valve that supplies compressed air to an ejector and a control device that controls communication and cutoff of the itga on-off valve.

[Function] In the pipe pressure feeding system of the present invention, the dehydrated sludge dehydrated by the dehydrator is pressurized by the pressurizing device, transferred to the sludge collection main pipe via the discharge pipe, and blown through the ejector. The compressed air flows through the collecting main pipe as a plug flow, passes through the collecting main pipe, and is smoothly transported to the final destination, such as an incinerator.

During this time, a control device controls the electromagnetic switches installed in the pressure piping that supplies compressed air to each ejector based on the time-programmed operation commands to determine which dehydrators in each group are to be operated and which ones are not to be operated. Opening and closing operations are performed by electrical signals from the

[Example] Hereinafter, the present invention will be described in detail using examples shown in the drawings.

FIG. 1 is a layout diagram of a pipe pressure feeding system according to the present invention. FIG. 2 is an operation command diagram showing a time schedule for controlling the opening and closing of the electromagnetic on-off valve for the ejector.

In Fig. 1, LA, IB, IC, and ID indicate one group of dehydrators, and similarly 2A to 2D, 3A to 3D, 4A to 4D.
is the dehydrator of each flock.

Reference numeral 100 denotes a pressurizing device, which uses, for example, a pressure pump such as a centrifugal pump or a reciprocating pump, or a squeeze pump. 120 is a discharge pipe, and a check valve 110 is provided in the middle of the discharge pipe. One group of discharge pipes 120 converge at one point, and a mud collecting main pipe 130 is provided connected to this, and immediately after the starting point of the mud collecting main pipe 130, an electromagnetic air is supplied from compressed air supply equipment (for example, a compressor) 200. Ejector 1 for supplying compressed air to mud collection main pipe 130 via on-off valve 310
40 is provided obliquely in the transportation direction.

In addition, in the middle of the mud collection main pipe 130, there are other groups of discharge pipes 12 as appropriate.
A check valve 150 is provided immediately before the merging point, and an ejector 140 is provided immediately after the merging point. The plurality of mud collecting main pipes 130 arranged in this manner are further merged together, and thereafter connected to the incinerator 60 as a collecting main pipe 160. A check valve 150 is also provided in the mud collecting main pipe 130 immediately before this confluence point.

Note that 300 is a control device that controls opening and closing of the electromagnetic on-off valve 310.

In this way, in the embodiment shown in FIG.
The operation of the pipeline transportation system of the present invention in which a group of 16 dehydrators are connected by a pipeline consisting of two mud collecting main pipes 130 and one collecting main pipe 140 will be described.

First, the dehydrators 100 classified into a plurality of groups, that is, 1
Group (IA, IB, IC, ID), Group 2.

Of the 3rd and 4th groups, for example, as shown in Fig. 2, the 1st and 3rd groups are stopped at the same time, and on the contrary, the 2nd and 4th groups are stopped in the opposite manner to the 1st and 3rd groups. The control device 300 is operated by specifying a time schedule for the operation, and at that time, the electromagnetic on-off valve 310 corresponding to the operation is opened and compressed air is blown from the corresponding ejector 140. At the same time, the pressurizing device 100 of the group of dehydrators corresponding to the operation
When the sludge is put into operation, the dehydrated sludge is forced to flow through the discharge pipe 120 via the check valve 110 and reaches the sludge collecting main pipe 130. The dehydrated sludge that has entered the sludge collection main pipe 130 is transferred to the ejector 14
The compressed air that is continuously blown in from zero forms a highly concentrated plug flow that smoothly flows downstream through the collecting main pipe 140 and then to the incinerator via the collecting main pipe 140. transported to.

After a certain period of time has elapsed in this manner, and a predetermined operating time (for example, the time between times t1 and t2) ends, the solenoid valve 310 that has been in the open state is closed, and instead of the solenoid valve 310 that has been in the closed state until now. is in the open state, groups that have been inactive, for example, groups 2 and 4, are activated, and the pressurizing devices 100 and ejectors 140 of the dehydrators of groups 1 and 3 are stopped while they are inactive.
The dewatered sludge from the dehydrators of the group and the group 4 is transferred to the destination in the same manner as described above. 2 while the 2nd and 4th groups are running
Compressed air from the group and fourth group ejectors 140 is prevented from flowing back by a check valve 150 disposed just before the intermediate point. In addition, the mud collecting main pipe 13 immediately before the collecting main pipe 160
The check valve 150 provided at the 0 end is to prevent the compressed air flowing downstream of the sludge collecting main pipe 130 and the accompanying dewatered sludge from flowing back into the other sludge collecting main pipe 130.

As explained above, by transporting based on a transport plan based on a time schedule that alternately repeats intermittent operation as in this embodiment, the transport capacity of the mud collecting main pipe 130 is equal to or greater than that of the discharge pipe 120. A little more than 4 times the capacity is sufficient, and 8 times the capacity of the dewatering machine is
Since there is no need to double the amount, equipment costs are significantly reduced.

[Effects of the Invention] As described above, according to the pipe pressure feeding system of the present invention, not only can dehydrated sludge be pumped at a high concentration, but also it does not generate bad odor or contaminate the equipment installation location. , not only can we maintain an extremely good working environment (,
Fully automated intermittent operation allows efficient transportation, and equipment costs are significantly lower than traditional belt conveyor systems.

[Brief explanation of drawings]

1 and 2 relate to an embodiment of the present invention, in which FIG. 1 is a layout diagram of a pipe pressure feeding system, FIG. 2 is an operation command diagram showing an opening/closing control time schedule of an electromagnetic on-off valve for an ejector, FIG. 3 is a conventional belt conveyor layout system diagram. IA, IB, IC, LD...Dehydrator, 2A, 2B, 2
C, 2D... dehydrator, 3A, 3B, 3C, 3D...
Dehydrator, 4A, 4B, 4C, 4, D...Dehydrator, 10
...Shoot, 20.30,40,50. ...belt conveyor, 60
... Incinerator, 100 ... Pressure device, 110.
...Check valve, 120...Discharge pipe, 130...
Sludge collecting main pipe, 140... Ejector, 150...
Check valve, 160...Collecting main pipe, 200...Compressed air supply equipment, 300...Control device, 310...Solenoid opening/closing valve. Figure 2

Claims (1)

[Claims] (1) A transfer means for collecting dehydrated sludge obtained from a plurality of dehydrators and transporting it to the next process, such as an incinerator, separated from the dehydrators, which includes a pressurizing device and a pressure device on the discharge side of the dehydrators. A slurry transport pipe is provided, which is equipped with a discharge pipe, and connects a plurality of the discharge pipes together at a starting point and an intermediate point, and is connected to the plurality of mud transport pipes and extends to the incinerator, etc. An ejector for feeding compressed air into the slurry main pipe is installed immediately after the starting point of the slurry main pipe, and a back check is provided immediately before the intermediate point of the slurry main pipe. A dehydrated sludge pipe pressure feeding system comprising a valve, an electromagnetic on-off valve that supplies compressed air to each ejector, and a control device that controls communication and cutoff of the electromagnetic on-off valve.