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Sand Cooler Classifiers.

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EFFECTIVE SAND COOLING

The cooling section cooling surfaces are generously designed to accommodate even the most demanding application. Either plain or finned steel cooling tubes are employed as may be most expedient. When finned tubes are used, direct attention is given to the 'finning factor' i.e. the reduced rate of heat exchange from the periphery of the fins when the temperature difference between sand and water is high.

Fluidised cooling surfaces do not suffer noticeable wear as a result of the fluidized sand but it is recommended that the circulating cooling water is treated, to prevent scale build-up. Units currently installed have not evidenced trouble after many years in service.

CHILLING

Sand cooling possibilities are limited by the temperature of the circulating cooling water and coolers can reasonably be designed to provide sand temperatures to within about 5'C of the incoming cooling water.

Frequently the most convenient water cooling device used is the evaporative tower, which is capable of cooling water to within some 3'C of the atmospheric local wet bulb temperature. If sand temperatures are required below these figures, water chilling units can be fitted to provide lower incoming water temperatures.

Under humid hot summer conditions in the United Kingdom this can mean that sand temperatures below some 28'C may be difficult to ensure without the use of a water chiller. In warmer regions it may be impractical to offer even this temperature.

With the foregoing in mind Richards will advise on the use of water from any other source - underground springs, rivers, ponds, canals or even sea water. When it becomes evident that simple, single stage cooling will not be sufficient, a small battery of chill water tubes can be included to provide a cooler-chiller unit.

ELUTRIATING - "FINES" - EXTRACTION

An essential feature of a sand reclamation system is the effective removal of unwanted fines - material generally below  90 MU. Dependent upon the packing density & sg of the sand in the system, elutriating velocities can vary. These variations in requirement are all part of the design calculation in evaluating your requirement.

FLEXIBLE DESIGN

Reclamation plants must sometimes be custom designed to fit into the available space. With this in mind Richards have frequently tailored cooler design to maximize convenience of installation.

SCREENING

Richards claim to have pioneered single discharge reclamation systems - i.e. with no requirement for continuous removal of oversize material This has been achieved by careful attention to the selection and design of the screening arrangements in the Vibrader range of sand attrition units. (Mechanical sand reclamation)

However a small proportion of oversize material and flakes of metal flash may present to the sand stream.

In our standard cooler classifiers these are collected by a novel system of 'upside down' screening to be retained in a readily cleaned tramp section in some custom designed units by mesh trays at the inlet to the cooling section.

CONSTRUCTIONAL FEATURES

  • All steel construction giving long, trouble free life. The finned steel tubes have fin pitches of 10mm, allowing the cooling surfaced to remain free of any large agglomeration that could be passed into the cooler if the attrition screens breach.
  • Low pressure drop fluidizing elements. Fluidizing elements take the form either of uniquely designed all steel bed developed by Richards, or of simple sparge tubes. Pressure drop across the elements is generally less than 5 m Bar (2" wg.).
  • Economical Operation Low pressure drop, fluidizing elements combine with low velocity fluidization across the cooling elements to ensure the need for minimal power.
  • Serpentine and contra flow sand & water paths The sand is made to flow in a serpentine path over & under weirs and left to right across the cooling elements. At the same time the cooling water is contra-flowed against this sand stream, providing effective heat transfer without the need to use fragile copper tubes.
  

Mechanical sand reclamation

Nominal sand inlet temperatures of 300'C or 500'C
Model 3 5 10 15 20 25 30
Capacity T/Hr 3 5 10 15 20 25 30

Richards Expertise ~ is ~ Backed by Experience

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Richards Engineering Ltd. 7 & 9 New Star Road, Leicester, England. LE4 9JD.

Tel No. +44 (0) 116 246 0055 --------- Fax +44 (0) 116 246 1142

Last updated 01 April 2009

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