A spiral seal continuous discharge filter for supercritical water treatment process

Abstract

The invention discloses a spiral sealing continuous discharging filter for the supercritical water treatment technology.The filter comprises a filter cavity and a motor arranged on the top of the filter cavity, wherein a feed inlet is formed in the upper end of the wall of the filter cavity, a filter net is arranged inside the filter cavity, a purified liquid outlet is formed in the outer side of the filter net, and a vertical discharging pipe is arranged on the bottom of the filter cavity; a driving rod driven by the motor to rotate is arranged on the center axis of the filter cavity, a plurality of electric scrape brushes are arranged on the driving rod, and a two-stage screw blade is arranged on the bottom of the driving rod.Due to the fact that the vertical discharging pipe is arranged on the bottom of the filter cavity, filter residues in the discharging pipe can be discharged more easily than filter residues in a horizontally arranged discharging pipe under the action of gravity and pressure; by arranging the two-stage screw blade on the bottom of the driving rod, squeezing and clustering caused by the large number of filter residues can be prevented, and filter residues can be pushed by the screw blade which has a sealing function and a filter residue pushing function so as to be discharged.

Description

technical field [0001] The invention belongs to the technical field of filtration and separation, and in particular relates to a spiral-sealed continuous discharge filter used in a supercritical water treatment process. Background technique [0002] At present, continuous filters are widely used in chemical production, and have many advantages such as simple structure, high filtration accuracy, automatic cleaning of filter screens, and PLC intelligent control of discharge. Due to the sensitive response, safe use and low price of the solenoid valve, the discharge device of the conventional continuous filter uses the solenoid valve as the switch of the discharge pipe, and the reliability of the solenoid valve in the vertical discharge pipe is very poor. The service life is greatly limited, so the discharge pipes of conventional continuous filters are installed horizontally. The normal discharge process of the continuous filter is: the filtrate enters the filter screen through...

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Problems solved by technology

However, the waste liquid or sludge used in the supercritical water treatment process generally has a high material content, and the material content after treatment is still high. The filter residue cleaned by the brush will accumulate in the discharge pipe and the inlet of the discharge solenoid valve, forming a relatively dense filter residue layer, which may agglomerate into blocks. At this time, even if the switch of the discharge solenoid valve is turned on, the pressure difference inside and outside the filter will be very It is difficult to achieve smooth discharge, and the filter residue in the filter will accumulate more and more, which will affect the normal operation of the filter. At this time, it is necessary to manually dredge the discharge pipe to assist the discharge. This method is time-consuming and laborious, and the efficiency is extremely high. Low

In addition, even if the material can be discharged smoothly, this intermittent discharge method that relies on pressure difference or time to automatically control the discharge has the biggest disadvantage: there will be pressure fluctuations inside the filter cavity during discharge, which will affect the pressure of the filter inlet pipeline , causing pressure fluctuations throughout the system

Because the cavity of the filter is connected to the atmosphere through the discharge pipe and the discharge solenoid valve during discharge, as the discharge process progresses, the pressure of the filter cavity will gradually decrease. When the discharge process ends, the discharge solenoid valve will Closed, the cavity pressure of the filter will gradually rise again, so the discharge valve is continuously opened and closed, and the pressure cannot be kept stable, which will inevitably affect the safety of the system

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