Auxiliary equipment for filtration system (3)

(4) Other auxiliary equipment
The collection and delivery of the filtrate of the filter is accomplished by means of a filtrate cylinder, a water separator and a filtrate pump.
The filtrate is a cylinder closed metal container. A partition is provided therein to separate the air from the filtrate; the side wall is connected to the filter by a pipe, and the upper and lower ends are respectively connected to the steam separator and the filtrate pump. A safety valve is arranged on the upper part of the filtrate cylinder to prevent excessive water in the filtrate cylinder, causing water to enter the vacuum pump.
The size of the filtrate tank depends on the area of ​​the filter used. Corresponding to different filtration areas, a sufficient volume of the filtrate cylinder must be provided to sufficiently separate the water in the gas and water mixture extracted by the filter, and to flow away from the bottom of the filtrate tank along the pipeline into the water pump.
The steam separator is a closed metal container installed between the vacuum pump and the filtrate cylinder. After the water-inhaled air taken in from the upper part of the filtrate tank enters the steam-water separator having a height difference of 10.5 m, the water is sufficiently separated and flows down the gas pressure pipe. The air is pumped out by a vacuum pump.
The filtrate in the filtrate tank must be drained with a water pump. Since the pressure in the filtrate tank is less than 101 kPa (atmospheric pressure), a centrifugal sand pump with a suction stroke must be used, and the bearing and the casing must be sealed to prevent air from leaking. In order to prevent the centrifugal pump from working under negative pressure, a communication tube can be connected to the upper part of the pump cylinder at the inlet of the pump to balance the internal pressure. The filtrate amount and the required head of the filtrate pump are determined by calculation. When the filtrate is concentrated, a backup pump must be provided.

The new design of multi beneficiation plant using an automatic draining device, and there are float-type valve-regulated basic structure (electric) and the like, as shown in Figures 8 and 9. The improved float automatic liquid discharging device has large liquid discharging capacity, long service life and convenient maintenance. The valve-controlled automatic draining device replaces the two floats with a control valve with a transmission mechanism to control the two drain tanks, rotates the accumulated and discharges the filtrate outward, and the work is more reliable. In Fig. 9, the spool communicates the nozzles a and b, c and e, respectively. The pressure in the left drain tank is less than the atmospheric pressure, the left drain valve is closed under atmospheric pressure, the pressure on both sides of the left filtrate valve is balanced, and the filtrate is flushed by the left filtrate valve under the action of its own weight, and flows into the left drain tank to accumulate. At this time, the right drain tank is isolated from the steam separator, and is open to the atmosphere, the tank is at normal pressure, the right filtrate valve is closed under the action of the atmosphere, and the filtrate accumulated in the right drain flows out of the tank under the action of its own weight. After a certain period of time, the spool moves to connect the nozzles a and c, b and d. The left and right drain tanks exchange the above actions. [next]
The control valve can be used as a two-position five-way valve (as described above) or a rotary two-position four-way valve. Control spool also in the form of a number, such as machine control, used for rotary control valves, may be driven member moving filter; solenoid control level is available, the trip cam or switching timing of the electromagnet relay operation.
The discharge volume of the automatic drain device has a large range of expansion and contraction. The float type can change the drain interval by itself to accommodate the filter discharge. The valve-controlled type can change the discharge time interval or the amount of liquid discharge per time by the control mechanism to adapt to the discharge volume of the filter.
(5) Filtration Auxiliary Equipment System The combination of the filtering auxiliary equipment system is related to the type and terrain of the selected filter. The following are common:

Figure 10 is a mechanical discharge (filter cake), a filtrate pumped out of the filtrate, and a filter device with a high-profile steam separator (preventing the filtrate from entering the vacuum pump) in front of the piston type vacuum pump. The filtrate tube outlet is submerged in the water seal tank. It is also possible to replace the water seal pool with a one-way valve, which is more reliable. This system is a long-established conventional combination.

Figure 11 is a filtration combination of blast discharge and automatic discharge of filtrate. The water ring vacuum pump is used to eliminate the steam separator before the exhaust gas enters the pump. The air compressor in the process can also use a low pressure blower according to the discharge requirements.

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