JPH0127762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for effectively discharging a gas phase from a phase separation device installed in a transfer line for a viscous multiphase flow. The present invention relates to a phase separation system that is equipped with a mechanism to detect a liquid phase, actuate a valve mechanism, and close a gas phase discharge line when the liquid phase is mixed into the discharged gas phase.

Coal and heavy oil mixed fuel (hereinafter referred to as COM) is a two-phase flow consisting of a mixture of coal powder and heavy oil, but it is actually a three-phase flow with air bubbles mixed in. When combusting such COM, the coal powder is limited to a predetermined size or less in order to pass through the burner nozzle. Also
When shipping and receiving COM, the flow rate is always measured, and the presence of gas phase in this process reduces the accuracy of flow measurement, so the gas phase must be removed before it flows into the flow meter. A phase separation device is generally provided for this purpose. An example of this phase separator is a method of detecting the liquid inside the phase separator and discharging the gas phase, such as in Japanese Patent Application No. 57-4539 "Strainer with Gas-Liquid Separation Function." However, conventionally, a liquid level detector is not provided in the phase separator, so the phase separator 1 shown in FIG. 1 alone cannot fulfill the exhaust function, and it is necessary to separately install a device with the above function. An object of the present invention is to realize a more effective gas phase discharge function by separately disposing a phase separation device and a gas phase discharge mechanism.

This will be explained below with reference to FIG.

The viscous multiphase flow flows in from the inlet of the phase separation device 1, and the phase separation device separates and removes the gas phase content and solid content exceeding a predetermined amount contained in this viscous multiphase flow.
It has a built-in strainer 6 that functions as an air separator and a strainer and has a filtering surface that allows solid particles of a predetermined size or less contained in the viscous multiphase flow to pass through. This filtration surface also has the function of attaching or trapping air bubbles and levitating them. In this phase separation device, by sliding relative to the filtration surface of the strainer 6 and the outlet 3 through which the viscous multiphase flow flows out after filtration and gas phase removal, the viscous multiphase flow is attached to or captured on the filtration surface as described above. It has a discharge port 5 that aggregates the gas phase to help float it and eliminates the thus floated gas phase, a scraper 7 that removes the captured coarse solid particles, and a coarse particle discharge port 4 that eliminates the coarse solid particles. are doing. A liquid phase detector 8 is disposed at the gas phase outlet 5 . The liquid phase detector is installed at the gas phase discharge port 5 of the phase separation device and the gas phase discharge line 9 of the air vent, and is used to detect the presence of a liquid phase in the discharged gas phase. Physical quantities that change due to the mixing of phases, such as liquid phase level caused by ultrasonic waves, changes in acoustic impedance of ultrasonic waves, or changes in sound speed may be used. This signal is sent to the control unit 11 which activates the valve mechanism 10 to close the gas phase exhaust line 9 due to the presence of the liquid phase. However, due to the time delay in the valve closing operation, the liquid phase may be discharged into the atmosphere if this continues, so a vent tank 12 is installed in the gas phase discharge line 9 to capture it.
When a constant liquid level is reached, the viscous multiphase flow is returned to the viscous multiphase flow source from the bottom of the vent tank 12 via the drain discharge valve 13.

When a liquid phase is detected and the valve is closed, it remains closed while the liquid phase is detected in the liquid phase detector, but it opens immediately when the liquid phase falls below a predetermined level. Therefore, if the transfer line is at high pressure, the multiphase flow will flow out at high speed. Therefore, a certain delay time is set in the control unit according to the amount of gas phase contained in the transfer line, and this delay time is We are planning to open the valve later. This allows a certain amount of gaseous phase to accumulate in the phase separator, thereby solving the above-mentioned problem.

In addition, if the liquid phase component in the liquid phase detector suddenly increases, the valve device must also operate rapidly, so by closing the valve when the rate of change in the liquid phase component exceeds a predetermined value, it is possible to prevent changes in the situation. Control can be performed accordingly.

As described above, according to the present invention, by adding a mechanism with a phase separation function to the phase separation device without newly installing a liquid level detector, multiphase flow can be achieved at high speed when the transfer line is under high pressure. Therefore, a certain delay time is set in the control unit depending on the amount of gas phase contained in the transfer line, and the valve is opened after this delay time. This allows a certain amount of gaseous phase to accumulate in the phase separator, thereby solving the above-mentioned problem.

In addition, if the liquid phase component in the phase detector suddenly increases, the valve device must also operate rapidly, so the valve can be closed when the rate of change in the liquid phase component exceeds a predetermined value to respond to changes in the situation. control can be performed.

As described above, according to the present invention, phase separation can be easily performed by adding a mechanism with a phase separation function without installing a new liquid level detector in the phase separation device, and furthermore, it is possible to easily perform phase separation without installing a new liquid level detector in the phase separation device. The valve mechanism inside the phase separation device has to be operated repeatedly, as in the case of separation by a method, which results in a small valve mechanism, which poses a problem in durability. There are advantages. Furthermore, since the liquid level between the multiphase fluid level in the phase separator and the discharge port can be kept high, it has the advantage of increasing separation performance.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram regarding the phase separation system of the present invention. 1... Phase separation device, 8... Liquid phase detector, 10...
... Valve device, 12 ... Vent tank, 11 ... Control unit.

Claims (1)

[Scope of Claims] 1. A phase separation device that is disposed in a flow path of a viscous multiphase flow and separates the viscous multiphase flow into solid, liquid, and gas phases, and a gas discharged from the phase separation device. a vent tank that stores mist contained in the gas phase in a discharge line communicating with the gas phase and separates the gas from liquid; and a liquid that detects the amount of liquid phase components contained in the mist between the vent tank and the phase separation device. A phase detector and a valve mechanism for opening and closing the discharge line are installed, and the valve mechanism is closed when the mist component of the signal from the liquid phase detector is greater than a predetermined amount, and the valve mechanism is closed in the gas phase discharged from the vent tank. A phase separation system characterized by being controlled so as not to contain mist. 2. The phase separation device includes an inlet for the viscous multiphase flow, a built-in strainer having a filter surface through which solid particles of a predetermined size or less contained in the viscous multiphase flow pass, an outlet for the viscous multiphase flow to flow out, and an outlet for the viscous multiphase flow to flow out. a scraper that slides relative to the upper surface of the strainer to remove the gas phase condensed on the upper surface and removes coarse solid particles captured on the upper surface; and a gas phase outlet that discharges the gas phase. 2. The phase separation system according to claim 1, further comprising a coarse particle outlet for removing coarse solid particles trapped on the filtration surface.