JPS631470B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of operating a vertical hydrohoist for pumping a high temperature, high pressure, and highly viscous liquid or slurry.

[Conventional technology]

The conventional vertical hydro hoist was developed in 1977.
It is configured as described in Publication No. 32345. That is, as shown in FIG. 2, in the vertical hydro hoist, 1 to 3 are supply chambers for temporarily storing slurry;
SP is a slurry pump that sends the slurry in the slurry tank 4 into the supply chambers 1 to ₃ via the inflow pipe and check valves _B1 to B3, and _D1 to _D3 are the supply chambers 1 to 3.
A check valve is installed in the pipeline that leads the slurry in ~3 to the outflow pipe and the discharge pipe 5, 6 is a tank that stores the driving liquid for pumping the slurry, and LP is a check valve that stores the driving liquid in the driving liquid tank 6. Inflow pipe and switching valve
_A driving liquid pump that sends the driving liquid to the supply chambers 1 to ₃ via A 1 to A 3, C ₁ to _{C 3} are switching valves installed in the outflow pipes that return the driving liquid in the supply chambers 1 to 3 into the tank 6, and F ₁
~ _F3 is a float provided to float on the interface between the slurry and the driving liquid in each supply chamber 1 to 3;
SH ₁ ~ SH ₃ and SL ₁ ~ _{SL 3} are each float F ₁ ~ _{F 3}
A detector for detecting the upper and lower limits of , for example, a proximity switch is used. 7 is a flow rate adjustment valve that adjusts the opening degree of the valve in response to a signal detected by orifice 8 of the flow rate Q ₁ of the driving liquid when slurry is delivered; 9 is a flow rate adjustment valve through which slurry is sent into supply chambers 1 to 3; This is a flow rate control valve that adjusts the opening degree of the valve in response to a signal detected by an orifice 10 regarding the flow rate Q ₂ of the driving liquid at the time of the flow rate Q 2 . 11 is a switching device that switches Q ₂ between two types: slightly smaller than Q ₁ (for example, Q ₂ =0.95Q ₁ ) and slightly larger than Q ₁ (for example, Q ₂ =1.05Q ₁ ). 12 are detectors SH ₁ to SH ₃ and SL ₁ to _{SL 3}
This is a controller that switches the switching device in response to the signal. Reference numeral 13 denotes an external flow rate indication signal system for setting the slurry pumping flow rate required from the process side.

Next, the operation of the hydro hoist will be explained.

First, the pumping of slurry when only one supply chamber is used will be described.

Now, if the supply chamber 1 is filled with driving liquid, the check valve D ₁ and the switching valve A ₁ are closed, and the switching valve C ₁ is open, if the slurry pump SP is driven, the check valve B will be removed from the slurry tank 4. ₁ is pushed open and the slurry is sent into the supply chamber 1, and the driving liquid in the supply chamber 1 is discharged from the switching valve _C1 to the driving liquid tank 6. As a result, the interface between the driving liquid and the slurry rises, and accordingly, the float _F1 floating on the interface also rises at the same time. Float F ₁ rises,
Detector SH ₁ detects when the upper part of the supply chamber is reached.
Then, upon receiving that signal, the switching valve _C1 closes. Next, when switching valve A ₁ is opened (driving fluid pump LP
(assumed to be already in operation), check valve
Since B ₁ is hydraulically closed and check D ₁ is open,
The slurry is pushed down by the driving liquid and is forced into the discharge pipe ₅ from the lower part of the supply chamber 1 through the check valve D1. As a result, the interface between the driving liquid and the slurry descends, and accordingly, the float _F1 floating on the interface also descends at the same time. When the float F ₁ falls and the detector SL ₁ detects it, the switching valve A ₁ is closed in response to the signal. Next, when switching valve _C1 is opened,
Raise the boundary surface again in the same way as above.

By repeating the above operations, the slurry in the slurry tank 4 is temporarily stored in the supply chamber 1 and then is forced into the discharge pipe ₅ through the check valve D1.

Therefore, if the supply chambers 1 to 3 are operated according to a time schedule in which the phases of the operation cycles are appropriately shifted, the slurry can be continuously pumped.

However, in actual operation, the above flow rate _Q1 and
It is extremely difficult to match Q ₂ completely. If the flow rate Q ₂ is even slightly larger or smaller than the flow rate Q ₁ , the slight difference will accumulate and eventually, for example, the switching valve C will close before the switching valve A closes.
opens. It is impossible to continue driving under such conditions.

To avoid this, the flow rate Q ₁ of the driving liquid that pumps the slurry out of the supply chamber is used as a reference, and the flow rate Q ₂ that fills the slurry into the supply chamber is set slightly larger (for example,
Q ₂ = 1.05Q ₁ ) or slightly smaller (e.g. Q ₂ =
0.95Q ₁ ). In other words, if the time from when the switching valve A of one of the supply chambers closes to when the switching valve C of the same supply chamber opens is shorter than the preset time set by the timer, the slurry filling amount Q ₂ is Slightly larger (e.g. Q ₂ = 1.05Q ₁ )
Switch so that Next, continue operation in this state, and after the switching valve C of one of the supply chambers is closed,
If the time it takes for the switching valve A in the same supply chamber to open becomes shorter than the preset time, the slurry filling amount Q ₂ may be slightly reduced (for example, Q ₂
= _0.95Q1 ).

By continuously repeating this operation,
Control is performed so that Q ₂ =Q ₁ on average over a long period of time.

[Problem that the invention seeks to solve]

The above-mentioned operating method requires a flow rate detector such as an orifice to detect the amount Q ₂ of slurry to be filled into the supply chamber and the amount Q ₁ to be pumped. With this detector, it is extremely difficult to detect the flow rate of a special liquid that is high in temperature and high in viscosity, and it has been impossible to apply it there.
For example, the viscosity of flow rate detection values from orifices, flow nozzles, etc. changes due to changes in temperature, and the accuracy of flow rate detection changes significantly, and electromagnetic flowmeters have problems such as not being able to withstand high temperatures and high pressures.

An object of the present invention is to provide a vertical hydrohoist that enables slurry pumping using a high-temperature, highly viscous driving liquid without requiring flow rate detection.

[Means for solving problems]

In order to achieve the above purpose, when the detected descending speed of the float becomes larger or smaller than the set descending speed, the rotational speed of the driving fluid pump is controlled to be small or large, and the detected rising speed of the float is set. This is to control the rotation speed of the slurry pump to become smaller or larger when the speed becomes larger or smaller than the rising speed. [Function] If the detected falling speed of the float is smaller than the set falling speed, the drive pump's rotation speed is The driving liquid pump is controlled so that the detected lowering speed becomes large by increasing the number of revolutions and increasing the amount of driving liquid.

In addition, if the detected rising speed of the float is smaller than the set rising speed, the slurry pump is controlled so that the detected rising speed is increased by increasing the rotation speed of the slurry pump and increasing the slurry filling amount. This solves the problem of deterioration in detection accuracy due to changes in viscosity.

〔Example〕

An embodiment of the invention will be described below with reference to FIG.

In FIG. 1, the same parts as in FIG. 2 are designated by the same reference numerals. Floats F ₁ to F ₃ are provided to float on the interface between the slurry and the driving liquid in each of the supply chambers 1 to 3, and detectors SH ₁ to _{SH 3} are installed at the vertical movement limit positions of the floats, respectively. ,SL ₁ ~SL ₃
is located. The rising speed of the float is determined by valve C.
Float from open signal to detectors SH ₁ ~ _{SH 3} respectively
It is measured as the time until the detection signal arrives. Further, the descending speed is measured by the time from the valve A open signal to the detection signal when the float arrives at each of the detectors _SL1 to _SL3 . The detected rising speed signal and detected falling speed signal of the float detected by these detectors are introduced into the controller 14, and the driving fluid is The rotation speed of pump LP is controlled.

Further, the rotation speed of the slurry pump SP is similarly configured to be controlled by a deviation signal between the set rising speed signal and the detected rising speed signal.

13 is an external flow rate indication signal system, and this signal system 13
adjusts the opening degree of the flow rate control valve 7 using an electric signal to adjust the amount of slurry to be pumped requested from the process side.

The present invention is constructed as described above, and detects the rising speed and descending speed of the floats in each of the supply chambers 1 to 3, and controls the rising time and falling time within a range that does not cause abnormalities in the time schedule.

That is, the flow rate _Q1 can be changed according to the request from the process side, and when the external flow rate instruction signal 15 corresponding to the desired slurry pumping amount requested from the process side is input to the controller 14, the controller 14 14, it is converted into a set descending speed and becomes a reference value. On the other hand, the detected descending speed of the float is constantly taken into the controller 14, the detected descending speed is compared with the set descending speed, and the speed is converted into the rotational speed of the driving liquid pump LP according to the deviation speed. The liquid pump is controlled so that the float always operates at a set lowering speed. That is, when the detected descending speed of the float is smaller than the set descending speed, control is performed so that the rotational speed of the drive pump LP is increased to increase the drive liquid amount _Q1 to increase the detected descending speed.

Further, the flow rate Q ₂ of the slurry pump SP is also controlled in the same manner as the flow rate Q ₁ . External flow rate instruction signal 1
5 is input to the controller 14, and within the controller 14, this signal is converted to a set rising speed and becomes a reference value.
On the other hand, the detected rising speed is always stored in the controller 14, and the rotation speed of the slurry pump is converted according to the deviation between the detected rising speed and the set rising speed. That is, when the detected rising speed of the float is smaller than the set rising speed, the rotation speed of the slurry pump SP is increased to increase the slurry discharge amount _Q1 , so that the detected rising speed is controlled to be large. By controlling the rotation speeds of the driving liquid pump and the slurry pump in this way, the float is operated so that the rising speed and the descending speed of the float are equal.

〔Effect of the invention〕

According to the method of the present invention, the rotational speed of the drive liquid pump or slurry pump is controlled by detecting the rising and falling speed of the float, so it is possible to control the rotation speed of the driving liquid pump or slurry pump without the need to detect the flow rate. Moreover, it is possible to pump a highly viscous driving liquid or slurry.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a vertical hydrohoist using the operating method of the present invention, and FIG. 2 is a schematic diagram of a vertical hydrohoist using the conventional operating method. 1 to 3... Supply chamber, F ₁ to F ₃ ... Float, SH ₁
~SH ₃ ...Detector, SL ₁ ~SL ₃ ...Detector, LP...
...driving liquid pump, SP...slurry pump.

Claims (1)

[Claims] 1 Install multiple supply chambers, connect the driving liquid inflow and outflow pipes for pumping slurry to the top of each supply chamber, and the slurry inflow and outflow pipes to the bottom of each supply chamber, and connect them to the interface between the slurry and the driving liquid in each supply chamber. The position of the floating float is detected by a detector installed at the top/bottom/movement limit position of the float, and according to the command, the valves installed in the inflow/outflow pipes for the driving liquid and slurry are opened/closed to forcefully feed the slurry. type hydro hoist, when the detected descending speed of the float becomes larger or smaller than the set descending speed, the rotation speed of the driving liquid pump is controlled to be small or large,
A method for operating a vertical hydro hoist, characterized in that the rotation speed of the slurry pump is controlled to become smaller or larger when the detected rising speed of the float becomes larger or smaller than a set rising speed.