NB/T 10737-2021Calculation method of drying intensity for slime drying system (English PDF)
煤泥干燥系统干燥强度计算方法
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Issued by
NEA
Level / Type
Industry · Recommended
Issue date
November 16, 2021
Implementation date
February 16, 2022
Scope
NB/T 10737-2021 is the English-translated version of 煤泥干燥系统干燥强度计算方法.
NB/T 10737-2021 gives the calculation of drying intensity for coal slime drying systems, defined as the mass of water evaporated per unit drying area of the equipment per unit time, in kilograms of water per square metre per hour.
Separate formulas are given for slime drum dryers and for slime fluidized bed dryers. The drum formula uses the mass of wet slime, the total moisture before and after drying, the effective drying area and the drying time, while the fluidized bed formula balances the water in the wet feed against the water leaving with each output stream.
It is a short calculation document limited to these two dryer types. Issued on 16 November 2021, it has applied since 16 February 2022.
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Document preview — NB/T 10737-2021
National Standard of the People's Republic of China
- Classification
- D 21
Issued by: National Energy Administration of the People's Republic of China
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Calculation method of drying strength
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted.
1 Scope
This document specifies the method for calculating the drying strength of the slime drying system.
This document applies to slime drum drying systems and slime fluidized bed drying systems.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.
GB/T 211 Determination method of total moisture in coal
GB/T 475 Manual method for commercial coal samples
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1 Drying intensity
The amount of water evaporated per unit of drying area of the coal slime drying equipment in unit time.
4 Calculation method of drying strength
4.1 Slime drum drying system
The drying strength of the slime drum drying system is calculated according to formula (1). m0(w0-w1) St(1-w1) (1) where.
X ---Dry strength, in kilograms per square meter hour [kg(H2O)/(m2·h)]; m0---the mass of wet slime, in kilograms (kg); w0---total moisture of wet slime, expressed in %; w1---total moisture of dry slime, expressed in %;
S --- Effective drying area of drying equipment, the unit is square meter (m2); t --- drying time, in hours (h).
4.2 Coal slime fluidized bed drying system
The drying strength of the fluidized bed drying system of coal slime is calculated according to formula (2). m0w0--miwi (2)
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 211-1996 — Determination of total moisture in coal
GB/T 211-2007 — Determination of total moisture in coal
GB/T 211-2017 — Determination of total moisture in coal
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