File:The manufacture of pulp and paper - a textbook of modern pulp and paper mill practice (1921) (14598208359).jpg

Identifier: manufactureofpul03join (find matches)
Title: The manufacture of pulp and paper : a textbook of modern pulp and paper mill practice
Year: 1921 (1920s)
Authors: Joint Textbook Committee of the Paper Industry Stephenson, J. Newell
Subjects: Papermaking Wood-pulp
Publisher: New York : McGraw-Hill Book Company
Contributing Library: NCSU Libraries
Digitizing Sponsor: NCSU Libraries

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that at 30, provision has been made to use fresh wateron grinder showers; this is usually done during the warm weather,to reduce temperatures in the system. Under these conditions,there is a surplus of water circulating in the system, and provisionis usually made for reclaiming some of the stock, which wouldotherwise be wasted in the white water discharged from thesystem. The save-all 33 is used for straining the fiber out of thiswhite water before passing to waste, as clarified white water,through outlet 34. The reclaimed stock, which is discharged at35, is mixed with the fiber strained out at 25. 87. Grinder Room and Wheel Pit.—Fig. 41 shows a cross sec-tion of a grinder room and wheel pit in a typical mechanical-pulp mill. The numbers up to 36 have the same significance asfor Fig. 40. In addition to these common items, Fig. 41 shows:A, a horizontal, double-runner, low head, reaction hydraulicturbine, which supplies the power for driving the grindstones THE.MECHANICAL-PULP MILL 69
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70 MANUFACTURE OF MECHANICAL PULP §3 connected to the turbine shaft at 77. B, C are guide vanes; thewater from wheel pit D passes through the guide vanes B and C,which direct the water against the turbine runners, located justinside the points marked B and C. The passing of the waterthrough runners causes them to rotate and deliver power to thegrinder shaft at H. The circulation of water currents in the wheelpit is shown by solid arrows. D is the wheel pit, which, duringoperation of the turbine, is filled with water. E is a gate for thewheel pit; during operation this is open, but if the wheel pit is tobe emptied, the gate is closed and water is drained out at V.F is the water level above the dam (forebay). G indicates ironracks, which are used to strain logs or other materials out of thewater before it is allowed to pass through the turbines. H is acoupling, connecting the hydraulic turbine with the grinder shaft;K is the tailrace; and L is a draft tube. The water, after passingthro

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