JP2010104866A - Dehydrating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dehydrating apparatus which can reduce cost required for dehydration treatment. <P>SOLUTION: A pressure pump 5 of the dehydrating apparatus 1 is driven to supply a liquid to be treated to a dehydrator 2 and also to an accumulator 3. When the internal pressure of the accumulator 3 reaches a predetermined high-pressure reference value, the pressure pump 5 is stopped, and the liquid to be treated in the accumulator 3 is discharged to the dehydrator 2. When the internal pressure of the accumulator 3 reaches a predetermined low-pressure reference value, the pressure pump 5 is driven to supply the liquid to be treated to the dehydrator 2 and the accumulator 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dehydrating apparatus including a dehydrator for dehydrating a liquid to be processed.

  Conventionally, a dehydration apparatus including a dehydrator (for example, a filter press) for dehydrating a liquid to be treated such as a slurry has already been proposed. A general-purpose pressurizing pump is generally used as a configuration for feeding the liquid to be treated to the dehydrator (see, for example, Patent Documents 1 and 2).

JP 2006-289149 A JP 2001-54704 A

However, when the dehydration operation proceeds in the dehydrator and the cake accumulates on the filter in the dehydrator and becomes clogged, the flow rate of the filtrate discharged per unit time decreases, and the power consumption of the pump is reduced. On the other hand, filtration efficiency will fall remarkably. As described above, since the conventional apparatus has a large energy loss, it is disadvantageous in terms of the cost required for the dehydration process, and improvement has been demanded.
Accordingly, an object of the present invention is to provide a dehydrating apparatus that can solve the above-described problems.

As a means for solving the above-described conventional problems, the present invention provides a dehydrator for dehydrating a liquid to be processed and the dehydration liquid from the outside via a liquid feed path to be processed connected to the dehydrator. A pump for feeding to the machine, and an accumulator that is connected to the liquid feed path to be treated and into which a liquid to be treated is introduced through the liquid feed path to be treated and is in a pressure accumulation state. A normal state in which the liquid to be treated is supplied to both the dehydrator and the accumulator, or only the accumulator when the pump is driven, and the accumulator in the pressure accumulation state is stopped while the pump is stopped. It is an object of the present invention to provide a dehydrating apparatus in which a processing liquid is discharged and an energy saving state in which the processing liquid is supplied to the dehydrator via the processing liquid feeding path is alternately switched.
Here, the accumulator itself is known, and when compressed air is contained and a liquid (a liquid to be treated in the present invention) is introduced from the outside, a so-called pressure accumulation state is obtained. On the other hand, when the accumulated pressure state is canceled, the introduced liquid (liquid to be processed) is pushed out by the compressed air and discharged.
With the above configuration using the accumulator, the liquid to be processed can be supplied to the dehydrator while the pump is stopped. Therefore, the cost required for the dehydration process while the drive of the pump is stopped. Can be reduced.

The dehydrator includes a filter, and dehydrates the liquid to be processed by the filter, and a check valve that prevents the liquid to be processed from flowing back to the pump is provided in the liquid supply path for the liquid to be processed. In the normal state where the pump is driven and the liquid to be treated is fed to the dehydrator, the filter of the dehydrator becomes clogged, and the flow resistance generated by the filter is reduced. As a result, a part of the liquid to be treated flows into the accumulator, and when the accumulator is in a pressure accumulation state and the internal pressure of the accumulator reaches a predetermined high pressure specified value, the pump stops driving. The accumulator in the pressure accumulation state enters an energy saving state in which the liquid to be processed is discharged to the dehydrator through the liquid supply path to be processed, and further, the energy saving in which the accumulator discharges the liquid to be processed to the dehydrator In state, the accum When the low-pressure specified value the internal pressure predetermined in Ta, the liquid to be treated from outside the pump is driven can be set to be the normal state is fed to the dehydrator.
In this way, by repeatedly changing the state based on the internal pressure of the accumulator, it becomes possible to feed a required amount of liquid to be processed to the dehydrator while temporarily stopping the pump.

Further, a three-way valve is disposed at an accumulator connection position of the liquid supply path to be processed, and the liquid to be processed between the accumulator and the dehydrator in a normal state by controlling the three-way valve. Supplying the liquid to be processed between the accumulator and the dehydrator in an energy-saving state so that the supply path is interrupted and the pump is driven to supply the liquid to be processed from the outside to the accumulator. The passage may be opened, and the accumulator in a pressure accumulation state may discharge the liquid to be processed to the dehydrator via the liquid supply path for the liquid to be processed.
With such a configuration, the accumulator can be forced to be in a pressure accumulation state.

In the above configuration, the pump is driven by being connected to a power source, and the liquid to be treated is supplied from the outside to both the dehydrator and the accumulator or only to the accumulator in the on state. It is desirable to stop the supply of the liquid to be processed in the off state.
With such a configuration, power consumption required for driving the pump can be saved.

  The present invention is a configuration in which a liquid to be treated is fed to a dehydrator using an accumulator. The longer the dehydration time is, the higher the energy saving effect is, and the cost for dehydration can be drastically reduced.

Embodiments of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the dehydrator 1 includes a dehydrator 2. The dehydrator 2 is composed of, for example, a filter press. When the liquid to be processed passes through a filter (not shown) provided in the dehydrator 2, cake is deposited on the filter and the filtrate is discharged. The dehydration process is performed.

The dehydrator 2 communicates with a pipe line (processed liquid supply path) 7, and a pressure pump 5 and a liquid tank 4 to be processed are disposed in the pipe line 7. The pressurizing pump 5 is connected to a power source (not shown).
In such a configuration, when the pressurizing pump 5 is turned on and driven, the liquid to be processed (external liquid to be processed) in the liquid tank 4 to be processed communicating with the pipe line 7 is transferred to the dehydrator 2. Be sent. On the other hand, when the pressurizing pump 5 is turned off, the feeding is stopped.

  An accumulator 3 is connected between the pressurizing pump 5 and the dehydrator 2 in the pipe line 7. The accumulator 3 is a known accumulator, and mainly includes a container in which air is contained. And when the said to-be-processed liquid is introduce | transduced into this accumulator 3 from the outside, the pressure of this to-be-processed liquid will be converted into the pressure energy of air, and this to-be-processed liquid will be stored (pressure accumulation state). The accumulator 3 is connected to an internal pressure gauge 31 for measuring the internal pressure of the accumulator 3, and is provided with an external air communication valve 32 for communicating the inside of the accumulator 3 with the external air.

  Further, a check valve 10 </ b> A is disposed in the pipe line 7 between the pressurizing pump 5 and the connection position of the accumulator 3. The check valve 10A prevents the liquid to be processed from flowing back to the pressurizing pump 5 side. In addition, a liquid to be processed discharge valve 6 that allows the liquid to be processed in the accumulator 3 to be discharged to the outside is attached to the pipe line 7.

Next, a procedure for dehydrating the liquid to be treated will be described.
First, the outside air communication valve 32 of the accumulator 3 is controlled so that an appropriate amount of outside air is sealed in the accumulator 3, and then the outside air introduction valve 32 is closed to make the accumulator 3 sealed.
In this state, as shown in FIG. 2, when the pressurizing pump 5 is driven, the liquid to be processed in the liquid tank 4 to be processed is fed to the dehydrator 2 through the pipe 7. Then, the dehydrator 2 starts the dehydration process.

  By the way, when the dehydration process proceeds and the filter of the dehydrator 2 becomes clogged, the liquid to be processed fed by the pressure pump 5 due to the flow resistance generated when passing through the filter A part of starts to flow into the accumulator 3. Then, the accumulator 3 is brought into a pressure accumulation state by increasing the internal pressure when the liquid to be treated is introduced. As described above, the state in which the pressure pump 5 is driven and the liquid to be processed is supplied to the dehydrator 2 alone or to the dehydrator 2 and the accumulator 3 is a normal state.

  Further, when the internal pressure of the accumulator 3 measured by the internal pressure gauge 31 rises to a predetermined high pressure specified value, as shown in FIG. 3, the pressurizing pump 5 is turned off to stop driving. At the same time, in the accumulator 3 in the pressure accumulation state, the liquid to be treated is pushed out into the compressed air and discharged to the dehydrator 2. Note that the liquid to be processed discharged from the accumulator 3 is not supplied to the pressurizing pump 5 side due to the function of the check valve 10A.

  Here, when the filter is clogged, the flow rate of the filtrate discharged per unit time is reduced, and the filtration efficiency is remarkably lowered with respect to the power consumption of the pressurizing pump 5, but as described above, the pressurizing pump Since 5 is stopped, power consumption is saved. On the other hand, it is conceivable that the supply of the liquid to be processed decreases due to the stop of the pressurizing pump 5, but the liquid to be processed discharged from the accumulator 3 compensates for this, so The total amount of the processing liquid is maintained at the same level as the flow rate before the filter is clogged. Thus, the state where the pressurization pump 5 stops driving and the liquid to be processed is discharged from the accumulator 3 is an energy saving state.

  Next, when the liquid to be treated is being supplied from the accumulator 3 to the dehydrator 2 and the internal pressure of the accumulator 3 is reduced to a predetermined low pressure value, the pressurizing pump 5 is driven. Resume (normal state). This is due to a decrease in the liquid to be processed discharged from the accumulator 3, and the entire amount of the liquid to be processed supplied to the dehydrator 2 is maintained by re-driving the pressure pump 5. Thereafter, the above-described pressurizing pump control is repeatedly executed.

  As shown in FIG. 4, the dehydrating apparatus 1 configured as described above can reduce the power consumption required for the dehydrating process as compared with the conventional configuration. Specific examples will be described below.

FIG. 4 is a graph showing the relationship between dehydration time and power consumption from the start of dehydration to the completion of dehydration. Experimental conditions are shown below.
A: Dehydration device of the present invention Pressure pump: Directly connected diaphragm pump (1.5 Kw)
B: Conventional dehydrator Pressurizing pump: Plunger pump (1.5Kw)
Dehydration pressure: 0.5 MPa
Treatment liquid concentration: 7500mg / L
In both apparatuses (A, B), the pressure pump was always driven to feed the liquid to be processed to the dehydrator until 7.5 hours after the start of dehydration. When 7.5 hours had elapsed, the power consumption was 3 KWH for both devices (A, B). On the other hand, when 7.5 hours have elapsed from the start of dehydration, only the dehydration apparatus (A) of the present invention starts supplying the liquid to be treated using the accumulator (the pressurization pump is stopped). In (B), the pressure pump was continuously driven. The increase in power consumption in the dehydrating apparatus (A) of the present invention thereafter decreased in inclination, and the power consumption was about 3.3 KWH when dehydration was completed. The power consumption of the conventional dehydrator (B) continued to increase, and the power consumption was about 5 KWH when the dehydration was completed.

  As described above, the dehydrating apparatus 1 including the accumulator 3 described above and alternately switching the driving and stopping of the pressurizing pump 5 has a higher energy saving effect as the dehydrating time becomes longer, and the dehydrating process while maintaining the dehydrating amount. The cost related to can be drastically reduced.

Moreover, the following modifications are proposed.
As shown in FIG. 5, in the dehydrating apparatus 1 </ b> A, a three-way valve 10 </ b> B is disposed at the connection position of the accumulator 3 in the pipe line 7 in addition to the configuration shown in FIG. 1.

  Here, when the three-way valve 10B is controlled to open and close, the dehydrator 2 and the accumulator 3 are shut off, and the dehydrator 2 and the pressure pump 5 are opened. The state is selectively changed to the second state where the pressure pump 5 is shut off and the dehydrator 2 and the accumulator 3 are opened.

  Then, as shown in FIG. 6, in the normal state, the accumulator 3 and the dehydrator 2 are shut off, and the pump 5 is driven so that the liquid to be treated is fed to the accumulator 3. When 10B is controlled, the liquid to be treated flows into the accumulator 3, so that the accumulator 3 can be forcibly brought into a pressure accumulation state. Further, when changing from the normal state to the energy saving state, the accumulator 3 and the dehydrator 2 are opened by controlling the three-way valve 10B as shown in FIG. The liquid to be processed is discharged from 3 to the dehydrator 2.

  In the configuration described so far, when the liquid to be processed in the accumulator 3 is to be discharged to the outside, the liquid discharge valve 6 to be processed is opened. Then, the liquid to be processed is discharged to the outside through the pipe line 7.

  The dehydrating apparatus of the present invention is not limited to the above-described embodiment, and can of course be changed as appropriate without departing from the gist of the present invention. For example, the type or performance of the accumulator 3 described so far can be appropriately selected based on the dehydration area of the dehydration chamber in the pressurization pump 5 and the dehydrator 2. The circuit shown in FIG. 1 and the like can be changed as appropriate. Further, the structure for introducing the outside air into the accumulator 3 and the structure for discharging the liquid to be treated to the outside may have other structures, or a structure in which the liquid discharge port and the outside air introduction port are made common. Good.

  The dehydrating apparatus of the present invention has a function of dehydrating the liquid to be processed and has a high energy saving effect, and thus can be used industrially.

Schematic diagram of dehydrator Schematic of dehydrator in normal condition Schematic of dehydrator in energy saving state Graph showing the relationship between dehydration time and power consumption Schematic of a dehydrating apparatus according to a modification Schematic of the dehydrator in the normal state in the modification Schematic of the dehydrator in a modified example and in an energy saving state

Explanation of symbols

1,1A Dehydrator 2 Dehydrator 3 Accumulator 4 Tank to be treated 5 Pressure pump 10A Check valve 10B Three-way valve

Claims (4)

A dehydrator for dehydrating the liquid to be treated;
A pump for feeding the liquid to be treated from the outside to the dehydrator via the liquid feed path to be treated connected to the dehydrator;
An accumulator that is connected to the liquid supply path to be processed, and in which a liquid to be processed is introduced through the liquid supply path to be processed to be in a pressure accumulation state;
With
A normal state where the pump is driven and the liquid to be treated is fed to both the dehydrator and the accumulator, or only to the accumulator,
The energy saving state in which the pump is stopped and the liquid to be processed is discharged from the accumulator in the pressure accumulation state, and the liquid to be processed is supplied to the dehydrator through the liquid supply path for the liquid to be processed is alternated. A dehydrating device characterized by switching to The dehydrator includes a filter and dehydrates the liquid to be processed by the filter, and a check valve for preventing the liquid to be processed from flowing back to the pump is disposed in the liquid supply path. In the configuration that was established,
In a normal state where the pump is driven and the liquid to be treated is fed to the dehydrator, the filter of the dehydrator becomes clogged, and a part of the liquid to be treated is caused by the flow resistance generated in the filter. Flows into the accumulator, and when the accumulator is in a pressure accumulation state and the internal pressure of the accumulator reaches a predetermined high pressure specified value, the pump stops driving and the accumulator in the pressure accumulation state is treated. It becomes an energy saving state in which the liquid to be processed is discharged to the dehydrator through the liquid supply path,
Furthermore, when the accumulator discharges the liquid to be processed to the dehydrator and the internal pressure of the accumulator reaches a predetermined low pressure value, the pump is driven to dehydrate the liquid to be processed from the outside. The dehydrating apparatus according to claim 1, wherein the dehydrating apparatus is in a normal state to be fed to the machine. A three-way valve is disposed at the accumulator connection position of the liquid supply path to be treated,
The three-way valve is controlled,
In a normal state, the processing liquid supply path between the accumulator and the dehydrator is shut off, and the pump is driven so that the processing liquid is supplied from the outside to the accumulator,
In an energy saving state, the processing liquid supply path between the accumulator and the dehydrator is opened, and the accumulator in a pressure accumulation state discharges the processing liquid to the dehydrator via the processing liquid supply path. The dehydrating apparatus according to claim 1 or 2, wherein the dehydrating apparatus is configured as described above. The pump is connected to a power source and is driven. When the pump is turned on, the liquid to be treated is supplied from the outside to both the dehydrator and the accumulator, or only to the accumulator, and when the liquid to be treated is fed in the off state. The dehydrator according to any one of claims 1 to 3, wherein the supply is stopped.