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Show THE SALT LAKE TIMES FRIDAY, APRIL 20, 1973 Utah Power fir Light Uses Thales' Theory, Electrostatic Precipitator RAPPER COLLECTION PLATE, FIELD v QIo GROUND (O coal burning units beginning with operation of the second unit in 1952, and the plant has essentially clear stacks without visible emission. The ordered precipitators for Carbon and Naughton, working in tandem with the mechanical precipitators already installed on four units of these plants, are designed to remove 98 per cent of particulate matter from the stack. And at UP&Ls initial unit of the Huntington plant, now under construction and scheduled for operation in 1974, an electrostatic precipitator designed for 99.5 per cent patriculate removal will be installed and provide an essentially clear stack. A precipitators components include wires of electrodes carry ing high voltage direct current and collector plates having a positive charge. When voltage is applied, an electrostatic field is created. As combustion products enter the field from the power plant furnace, the solid particles are given a negative charge by the electrostatic action of the field. The negatively charged particles are attracted to the positive collector plate. The gasses, now free of virtually all of the par- - Page Five National PTA Selects concerned with new and broader dimensions of effective involv-xnen- t, she added. The convention program this year has been designed to stimulate and motivate PTA delegates to become involved in all issues affecting children and youth. Topics for Ideashops range from building more effective PTAs to education legislation in Washington, D.C. These popular sessions, featuring nationally known educators as well as PTA leaders, will also focus on such vital subjects as the dilemma of financing education; health education; big city problems; home-schorelationships; and shared decision-makin- g in education. One of PTAs priority projects which has gained national. recognition is PTSA Associations). A special workshop, PTSA: Developing and Sustaining a Real Partnerwill involve the youth ship members of the National PTA Board of Managers. Other National PTA projects to be the subject of workshops . are: Al- St. Louis for 77th Annual Meeting Dimensions of Involvement is the theme for the National PTA at its 77th annual convention, to be held May 20-2- 3 at the Chase-Par- k Plaza Hotel in St. Louis, multi-million-memb- er Missouri. Our theme emphasizes that, in todays world, there are persuasive reasons for expanding concerns beyond the limits of ones neighborhood, said National PTA President, Mrs. Elizabeth Mallory. As more and more decisions which influence our lives today are being made by state and national governments, Mrs. Mallory explained, any attempt by individuals to retreat to the isolation of local action and concern becomes shortsighted and restrictive. Experience proves that isolating ourselves is This is why the National PTA is self-defeatin- ol (Parent-Teacher-Stude- g. particles tend to form a mass as tides, pass to the stack. The they cover the collector plates. The plates are rapped and the mass of particles fall to a hopper below. cohol: A Family j Affair; ns dial Where thousands of listeners enjoy concert music and news every day! D o Is) The caboose of a railroad train is as far back as you can go, and thats where youll find Ray. Hes a Union Pacific Railroad conductor, responsible for the safe operation of all the cars that roll ahead of him. Ray receives and dispenses orders from the dispatcher, manages the train crew and regulated the speed of the train in conjunction with the engineer. When your goods get delivered, on time and intact, its because of back-sedrivers like Ray Humerick, just one of the twenty-seve-n thousand railroad Union at Pacific. of them the Because and professionals job they do, were not just another railroad. Were the railroad that can handle it. at Chi- ldrens Emotional Health; RISE Reading Improvement Services Everywhere; and To Make a Difference Volunteers in the Juvenile Courts. Principle of Electrostatic Precipitator Heres how electrostatic precipitators employ an elementary role of science: (1) A precipitator includes wires of electrodes carrying high voltage direct current and collector plates with a positive charge. Voltage is applied and an electrostatic field is created. (2) As combustion products enter the field from the furnace, the solid particles are given a negative charge by the electrostatic action of the field. (3) The negatively charged particles are attracted to the positive collector plate, and the gases, now virtually free of all the particles,, pass to the stack. (4) Periodically, the plates are rapped and the particles fall to a hopper. Good old Thales. 2500 years ago: an electrostatic Some 600 years before Christ, precipitator. this Greek philosopher recorded This device based on Thales strange phenomena that prove observation is a huge steel box to be one of the principal weap- that weighs upwards of 600 tons ons fighting air pollution. and stands upwards of 80 feet But to get back to Thales. Leg- tall. The first one at Huntington end has it that while playing Plant will cost $5.5 million. Utah Power & Light has inwith some stones called eleck-trohe. noted the stones at- stalled precipitators at most of , tracted lint and other light ob- its units since 1949; moreover, jects after being rubbed. Later the utility is spending millions these stones became known as of dollars to upgrade the existamber. ing electrostatic precipitators Generations of school children and ordering new precipitators have been shown the same ex- at its Carbon and Naughton periment by rubbing a piece of units. Electrostatic precipitators work glass rod with silk thereby making the rod capable of picking on the principle that opposites up light objects because of static attract and operate so efficiently electricity induced in the glass that some 99 percent of particulate matter entering the device rod. & Power Utah Light can be removed from the gases Today, Co. and other utilities are put- before they reach the stack. The first precipitators built in ting this basic principle to use never contemplated by the anci- the late teens and early 20s were able to capture close to 80 per ent Greeks. One f the knottiest challenges cent of the matter, but continued for any industry that burns coal research and development has is to effectively trap unburned increased their efficiency. Evidence of electrostatic preparticles (fly ash) that leaves a plants furnace and otherwise go cipitators efficiency is pointed up the stack and out into the up by two coal burning units of UP&Ls Gadsby Plant in west atmosphere. The solution came by applica- Salt Lake City. The utility intion of Thales observation over stalled precipitators in the two nt |