JPH0127763B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention provides a method for transporting a high viscosity fluid containing powder such as coal/heavy oil mixed fuel (hereinafter referred to as COM). The present invention relates to a phase separation system that removes powder, automatically separates and eliminates gas phase components, and efficiently discharges gas phase components in accordance with the transfer state of high viscosity fluid.

In order to save petroleum fuel and review coal resources, COM is a mixture of pulverized coal and heavy oil in an almost equal weight ratio, and a small amount of surfactant is injected to improve dispersion. For such a composition
COM has a very high viscosity, and the mixed gas phase is difficult to remove. However, improving fuel usage efficiency is paramount from the perspective of fuel conversion.
And accurate weighing for these COM transactions is an absolute problem.

Since positive displacement flowmeters are currently optimal for high-precision measurement of high-viscosity fluids, positive displacement flowmeters can also be considered for measuring COM. Various countermeasures have been taken for positive displacement flowmeters that are used with COMs, such as when they get stuck in the flowmeter and stop rotation, or when the COM exhibits Bingham-like behavior. However, even if a positive displacement flowmeter is equipped with countermeasures, it is not allowed to contain particles larger than a certain allowable size, so they must be removed. Furthermore, even when not measuring with a positive displacement flowmeter, it is necessary to remove the gaseous phase contained in the COM. A phase separation device is used for this purpose, but since large amounts of air are often mixed in when fuel is transferred to onshore storage tanks by tankers, etc., it is necessary to efficiently remove the gas phase. There is.

By the way, it is not a good idea to install a phase separator having a separation capacity corresponding to the amount of gas phase content each time according to the usage conditions. However, when fuel is transferred to a storage tank by a tanker, etc., the amount of gas phase contained in the high viscosity fluid varies depending on the tanker's loading capacity, the capacity of the transfer piping, the capacity of the phase separation device, etc. The state of change in the flow rate is almost constant. In view of this point, it is an object of the present invention to provide a phase separation system in which a phase separation device attached to a transfer pipe can be operated efficiently.

The configuration of the present invention will be described below based on an embodiment shown in FIG.

1 is a phase separation device. Reference numeral 2 denotes a processing tank having an inlet 3, an outlet 4, and an outlet 5 for taking out filtrate, and is provided in a flow path 6 for transferring high-viscosity fluid. 7 is a reservoir formed above the processing tank 2, and 8 is a discharge port. Reference numeral 9 denotes a motor attached to the outside of the upper part of the processing tank 2, and the rotating shaft 9a passes vertically through the center of the processing tank 2, and rotates the scraper 10 of the strainer mechanism A along the outside of the tube body 11 to remove the filter sieve. It is designed to remove coarse particles that stick to the eyes. The filter body 11 is a porous structure having a desired sieve mesh, and may be provided with a desired filtration surface such as a wire mesh, a punching board, or multi-stage annular slits between ring elements arranged in multiple stages. , its composition is not specified in any way. 12 is a gas phase separation device. Gas phase separator 1
2, a valve 17 connected to a valve stem 16 of a rotary rod 15 connected to a float 14 is connected in a tank 13 so that an exhaust port 18 can be opened and closed, and the float 14 is connected to a valve 17 connected to a valve stem 16 of a rotating rod 15 connected to a float 14 so that an exhaust port 18 can be opened and closed. It is equipped with a configuration that controls the opening and closing of the valve using the vertical movement of the valve. 19 is an exhaust flow path connected to the exhaust port 18;
0 is a control valve provided in the exhaust flow path. It is convenient if the control valve is equipped with a positioner because the valve opening degree can be set arbitrarily. Reference numeral 21 denotes a control device that applies an operation signal to the control valve to control the valve opening degree. Reference numeral 22 denotes a setting device for giving a setting signal to the control device 21, and uses, for example, a program timer.

The operation of the present invention will be explained based on the above configuration and the flow rate changes shown in FIG.

When the pump (not shown) is started and the valve (not shown) of the transfer piping is opened, the flow path 6 is filled with air immediately after the start of transfer. Therefore,
If the control valve 19 is set to be fully open at this initial stage of startup, the gas phase (mostly air) will pass through the phase separator 1 to the control valve 20 in the exhaust flow path 19.
It is actively excreted through the Then the fluid flows,
Since the time t ₁ for reaching the phase separation device is known empirically, by setting a program timer,
When time _t1 is reached, the opening degree of the control valve 20 is adjusted to 1/2, for example. In this state, processing tank 2
When COM is introduced to the outside of the filter cylinder 11 equipped with the strainer mechanism A through the inlet 3 of the
When the COM collides, coarse particles are captured by the filtration surface, and the COM that passes through the filtration surface contains particles smaller than the size specified by the size of the sieve mesh.
COM passes through and flows out to outlet 4. When the COM collides with the filtration surface, the gas phase contained in the COM is captured by the filtration surface and becomes bubbles.Furthermore, when the COM is slid on the filtration surface by the scraper 10, the bubbles are converged and moved along the scraper 10. It floats up, is stored together with the liquid phase in the storage section 7, and is transferred to the gas phase separation device 12. Then, when the gas phase is stored in the upper part of the gas phase separator and the liquid level decreases, the float 14 descends, and accordingly the valve 17 also descends, and the exhaust port 1
8 is opened, the gaseous phase is discharged to the exhaust passage 19, the liquid level rises, and the valve 17 closes the exhaust port 18 again. On the other hand, by rotating the scraper 10, the coarse particles captured on the filter surface fall downward due to the scratching action and are discharged from the discharge port 5.

Due to the above-described action, coarse particles in the COM are continuously removed, and the COM is used while keeping the filtration differential pressure at a low level at all times, and the gaseous phase is removed and exhausted from the control valve 20 of the exhaust flow path 19. Therefore,
The clean fluid obtained from the outlet 4 is accurately measured by a flow meter (not shown) and transferred to a storage tank (not shown).

Subsequently, at time _T2 , the liquid is fed at the maximum flow rate. Further, near the end of the transport operation, at time _T3 set in the program timer, the opening of the control valve 20 is adjusted to, for example, 1/2, and the opening of the control valve 20 is adjusted to 1/2.
The valve is closed at T ₄ .

The valve opening adjustment of the control valve 20 described above is generally determined for the purpose of eliminating electrostatic interference of the fluid and eliminating excess flow rate due to fluid inertia when transferring a set flow rate correctly in liquid transfer. Based on the same idea, the flow pattern shown in Fig. 2 is also applied to viscous multiphase flow such as COM. Therefore, in a viscous multiphase flow, bubbles in the gas phase are difficult to float due to their viscosity.
Therefore, separation is difficult. The above-mentioned phase separation device utilizes the principle of separating the gas phase by utilizing the flotation effect of promoting the bonding of air bubbles by injecting them into the tube body 11. In order to improve the effectiveness, we take advantage of the fact that the gas phase contained in the inflowing COM in the flow pattern is large when the flow rate is low and small when the flow rate is high. The control valve 20 is opened and closed according to the valve opening degree corresponding to the COM flow rate, allowing for satisfactory gas phase separation on a small phase separation device.

As described above, the phase separation system according to the present invention has a simple structure and can respond to the flow rate state of the transfer channel or the amount of gas phase when receiving fuel from a tanker or the like to a storage tank on land. Since the gas phase component is appropriately separated and removed, the separation function of the phase separator can be improved, and the measurement accuracy of the flowmeter can be improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure is an explanatory diagram of the operation of the present invention. 1... Phase separation device, 6... Transfer channel, 19...
Exhaust flow path, 20... control valve, 21... control device,
22...Setting device.

Claims (1)

[Claims] 1 A phase separation system that separately separates solid and gas phases from a viscous multiphase flow consisting of solid, liquid, and gas phases to obtain a liquid phase, which separates the liquid phase in the viscous multiphase flow that flows into the phase separation system. A cylindrical filter, a scraper for removing the solid phase adhering to the outer circumferential surface of the filter, a cylindrical phase separator that can store the gas phase floating from the outer circumferential surface of the filter, and a gas phase storage section in the upper part of the phase separator. The gas phase stored in the storage section is introduced into the reservoir, and the liquid phase contained in the gas phase is separated by gravity, and the gas is passed through a valve linked to a float that rises according to the liquid level of the liquid phase. A gas phase separator for discharging a gas phase, a control valve installed in an exhaust flow path for discharging a gas phase in the gas phase separator, a control device for controlling and driving the opening and closing of the control valve, and a viscous multiphase flow control device for controlling the opening and closing of the control valve. and a setting device that commands the valve opening of the control valve according to the time chart of the flow rate, and the setting device increases the valve opening when the flow rate of the viscous multiphase flow is small, and sets the valve opening when the flow rate is large. A phase separation system characterized by a small opening.