One Question per Day (February 12, 2018)
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This post was last edited by yangshaoj2005 on 2018-2-12 at 20:43. What are the technical requirements in the coal standards for fixed-bed furnaces operating at atmospheric pressure? Coal type, particle size, limit of lump coal content, gangue content, ash content, ash fusion temperature ST, total sulfur content, thermal stability, crush resistance, maximum thickness of the volatile matter layer in float coal, calorific value Qnet,ar
Coal type, particle size, limit of lump coal content, gangue content, ash content, ash fusion temperature ST, total sulfur content, thermal stability, crush resistance, maximum thickness of the volatile matter layer in float coal, calorific value
Technical requirements: Bituminous coal: 25–50 mm; Anthracite: 13–25 mm and 25–50 mm. The minimum proportion of lumps in the coal is as follows: for particles in the 25–50 mm size range, this proportion must be ≤18%; for particles in the 25–80 mm size range, it must also be ≤18%. The ash content is limited to <2.0% for grade 1, and 2.0–3.0% for grade 2. Ash content on a dry basis: ≤18.0% for grade 1, and >18%–24% for grade 2. Total sulfur content on a dry basis must be ≤2%. Coal ash softening temperature (ST): When the ash content on a dry basis is ≤18%, ST must be ≥1150°C; when it is 18–20%, ST must be ≥1250°C. Thermal stability (ST+6) must be >60%. Crushing strength (for particles >25 mm) must be >60%. Thickness of the gel layer (Y): Y must be <12 mm. Heat value (on a lower heating value basis): Anthracite must have a heat value of >6500 kcal/kg； ?Bituminous coal > 6000 kcal/kg
Particle size grading, minimum lump size percentage, ash content, ash fraction, total sulfur, ash softening temperature, thermal stability, crush resistance, cutin layer thickness, calorific value
Coal type, particle size, limit of lump coal content, gangue content, ash content, ash fusion temperature ST, total sulfur content, thermal stability, crush resistance, maximum thickness of the volatile matter layer in float coal, calorific value
Coal type, particle size, limit of lump coal content, gangue content, ash content, ash fusion temperature ST, total sulfur content, thermal stability, crush resistance, maximum thickness of the volatile matter layer in float coal, calorific value Qnet,ar
Coal type, particle size, limit of lump coal content, gangue content, ash content, ash fusion temperature ST, total sulfur content, thermal stability, crush resistance, maximum thickness of the volatile matter layer in float coal, calorific value
Coal type, particle size, limit of lump coal content, gangue content, ash content, ash fusion temperature ST, total sulfur content, thermal stability, crush resistance, maximum thickness of the volatile matter layer in float coal, calorific value
Particle size classification: Bituminous coal: 13–25, 25–50, 50–100, 25–80 mm; Anthracite: 6–13, 13–25, 25–50 mm. The maximum proportion of particles larger than 50–100 mm is ≤15%； Particle size range of 25–50 mm: ≤18% ； Particle size range of 25–80 mm: ≤18% MT 1; gangue content at grade 1: <2.0% ； Grade 2: 20.%–3.0% MT; Ash content (Ad): Grade 1 – Ad ≤ 18.0%; Grade 2 – 18.0% < Ad ≤ 24.0%. Total sulfur content (St.d): St.d ≤ 2.0% per GB 214. Coal softening temperature (ST): ST ≥ 1250°C; however, when Ad ≤ 18.0%, ST ≥ 1150°C. Thermal stability (ST+6): TS+6 > 60.0%. Crushing strength (>25 mm): >60.0%. Size of the gel layer (Y): In cases where there is no mixing device in the gasifier, Y < 12 mm ； The producer furnace is equipped with a stirring device; when Y<16mm, the heat generation value (Qnet.ar) is as follows: for anthracite, Qnet.ar>23.0 MJ/Kg, and for bituminous coal, Qnet.ar>21.0 MJ/Kg
Particle size grading, minimum lump size percentage, ash content, ash fraction, total sulfur, ash softening temperature, thermal stability, crush resistance, cutin layer thickness, calorific value
Coal type, limit of lump coal size, ash content, ash, total sulfur, thermal stability, crush resistance, vitrinite layer, calorific value, and ash content