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Innovative Wastewater Technology for Industry and Community
Polymer and Chemical Systems - technical details
 DESCRIPTION The Hydro Polymer Preparation System has the capability to automatically prepare dry solution and emulsion polymers. Each type of polymer has a separate point of entry into the high energy disperser chamber. The second stage mixing tank employs a low shear, hollow bladed stainless steel impeller. The entire system is an integrated package pre-piped, pre-wired, skid-mounted system whose dimensions do not exceed 1950 high x 1200 wide x 2500 long. This configuration provides for a complete polymer preparation system occupying the smallest possible space. WETTING CHAMBER The wetting chamber consists of two integrated zones. The initial area, called an acceleration zone, is a machined stainless steel barrel with a tangential water connection and emulsion polymer injection fitting. Water introduced tangentially produces a deep vortex into the second stage mixer below. The second stage mixer, close-coupled to the first, encloses a high shear mixing impeller imparting additional energy to the vortex. The resultant vortex produces a suction force that insures a vacuum for pulling any airborne dry polymer particles into the water vortex. The polymer and water flows into the center of the impeller and discharge at the perimeter via centrifugal force generated by the rotating impeller. The wetting system volutes is constructed of machined stainless steel. The entire wetting system is enclosed in a single housing. The polymer/water initial wetting is clearly visible through an acrylic barrel that also serves to enclose the dry polymer as it is fed into the water vortex. MIXING TANK The mixing tank is constructed of stainless steel. The mixing tank has a square section from mid-height to top providing optimum mixing pattern without relying on interior baffling. The mix tank has a minimum 600L capacity and is mounted vertically above holding tank. Gravity is used for solution transfer. The mix tank is equipped with an electronic operated dump valve. Mixing time is adjustable by means of a panel mounted PLC timer. Cycle is based on high/low level controls in mixing tank. The mixer has a stainless steel impeller. The mixer diameter is large as possible to fit inside the tank diameter, guaranteeing the most uniform distribution of mixing energy. The mixer shaft is stainless steel with clear PVC sleeve to direct polymer slurry from the wetting device into hollow-bladed impeller. Centrifugal force generated by the rotating hollow impeller draws the slurry into the center of the impeller. The slurry travels radically the length of the impeller blades and exit continuously at the tips of the rotating impeller. This action also causes material in the tank to re-circulate through an opening in the center of the impeller, creating the maximum low shear turbulence. HOLDING TANK The holding tank will have a minimum 600L capacity and be constructed of material similar to mix tank (stainless steel). PROCESS CYCLE Sequential operation is initiated by low level in mix tank. This starts the tank mixer, disperser, water, and polymer feeder to begin in a timed sequence, preparing a batch of polymer at a preset concentration. Polymer batch concentration is selected via a panel mounted polymer at a preset concentration. Polymer batch concentration is selected via a panel mounted polymer feed timer PLC. A high level in mix tank initiates the shutdown sequence. The shutdown turns off polymer feeder (assuming it has not completed timing sequence) while allowing disperser water flow to flush disperser system and plumbing of activated polymer. WATER FLOW Dilution water flow is maintained at a constant rate of 80 or 120 Lpm by means of a flow control valve. A differential pressure indicator/switch is supplied to display water differential pressure. Low differential pressure switch shuts down system and energize panel mounted alarm light and audible alarm after delay. Water flow (on/off) is controlled by an electronic ball valve with spring to close for fail-safe operation. Total electrical service is 240v AC – 50 – 60 Hz – single phase – 20 amps. COMPONENTS PUMPS (OPTION) The system is available with a 88 or 140 Lphr motor-driven diaphragm pump to feed emulsion polymer. The optional pumping system fits within the perimeter of the disperser module. VOLUMETRIC FEEDER The volumetric feeder consists of the following components: a. A flexible vinyl hopper of 0.283m³ with a 1.0m³ extension hopper. Motor a 0.18m³ , 90v DC, 1800 RPM. The unit has a variable speed SCR with a 50:1 turndown ratio. The Helix delivery screw, the nozzle adapter and side panels is 304 stainless steel. b. The discharge port of the volumetric feeder is completely enclosed in an acrylic chamber. This prevents inadvertent driving of airborne polymer dust and protect feeder discharge from environment. The discharge port is fitted with a pneumatically operated valve to isolate dry polymer from the environment between cycles. The compressor and control valve to actuate this valve is included as part of the disperser package. c. Dry polymer relies on gravity to transfer from feed device to wetting device. This eliminates the need for any type of pneumatic conveying system. MOTORS/GEAR REDUCERS The impeller is driven by 1kW 240v, 1 Phase, 50-60 Hz, TEFC, wash down duty 56-C frame type motor, coupled with a right angle gear reducer. The gear reducer and motor is mounted on a channel crossing the mixing/holding tank. The impeller is coupled to the gear reducer. The wetting device is driven by a 0.75 kW, 240v AC, 1 Phase, 50-60 Hz, TEFC, wash down duty 56-C frame motor coupled to a right angle gear drive. CONTROL PANEL The system has a control panel for fully automatic control. Control panel construction is IP65 or NEMA 4X, door mounted power disconnect switch, adjustable feed timer, and programmable controller for sequencing control. Control devices shall include: a. Hand-off-auto switch for mixer motor, off/auto switch for disperser system and a dry/off/liquid switch for dry or liquid polymer feeders. b. An illuminated push button is supplied for alarm indication and alarm reset in an alarm condition. Push button is supplied for audible alarm silence. The push button is supplied for short batch which simulates mix tank high level and initiates shutdown sequence. c. A pilot light is supplied for power available at panel. d. The panel includes an adjustable timer to control polymer feed duration. e. The panel alos includes adjustable switches to control mix cycle time. f. Front panel mounted controls are to industrial duty. g. The panel includes an audible alarm for loss of water pressure, loss of water flow, motor overload, loss of air pressure and tank overflow. Fault indication is at PLC. h. The panel includes a counter to count number of cycles performed.
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