Evaluation of the effectiveness of coal dewatering in filter centrifuges. [Formulae for efficiency]

Journal Article · Sat Jan 01 04:00:00 EST 1977 · Coke Chem., USSR (Engl. Transl.); (United States)

OSTI ID:5631377

Shlau, A V; Gizunterman, V V

This article proposes a new criterion for evaluating the effectiveness of coal dewatering in filter centrifuges. The operation of filter centrifuges is generally evaluated from the total moisture content of the residue and the solid-phase content of the centrifugate. However, the total moisture content of the dewatering product does not indicate the technological efficiency of a specific unit with respect to the theoretical maximum degree of mechanical dewatering. The effectiveness of coal dewatering is evaluated abroad from the surface moisture defined as the difference between the total moisture content and the moisture content of the air-dry coal (internal, or hygroscopic moisture). The hygroscopic moisture is considered to represent the limit for mechanical dewatering, an unwarranted assumption, since coal also contains capillary water, most of which can be removed only by thermal method. In our opinion, it would be better to evaluate the effectiveness of mechanical dewatering by using the maximum molecular moisture content which takes capillary water into account and represents the limit for mechanical dewatering techniques. Unfortunately, this proposed efficiency criterion ignores the slurry entrained in the centrifugate. The well-known equation of Pavlovich et al. takes into account the physical nature of the process and makes it possible to evaluate the extent to which the mixture to be dewatered has been separated into solid and liquid phases. The efficiency of the dewatering process, determined from the proposed formulas, is then the extent to which the practical efficiency approximates to the maximum possible theoretical efficiency, taking into account the physical properties of the coal to be dewatered and the technological ideality of the equipment used. (LTN)

• OSTI ID: 5631377
• Journal Information: Coke Chem., USSR (Engl. Transl.); (United States), Journal Name: Coke Chem., USSR (Engl. Transl.); (United States) Vol. 10; ISSN COKCA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
ASIA
CENTRIFUGES
COAL PREPARATION
COMMINUTION
CONCENTRATORS
DISPERSIONS
EFFICIENCY
EUROPE
MIXTURES
PERFORMANCE TESTING
REMOVAL
SLURRIES
SUSPENSIONS
TESTING
USSR
WATER REMOVAL