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Steam Tube Coal Dryer for Low-Rank Coal
Introduction
A steam tube coal dryer is an indirect thermal drying system designed to reduce high moisture levels in low-rank coals (such as lignite and sub-bituminous coal). By using steam circulating inside sealed internal tubes rather than direct flame contact, this dryer safely upgrades low-calorie coal into high-energy fuel with minimal volatile loss and low dust explosion risks.
Working Principle
Indirect Heating: High-pressure steam is piped into a rotating network of tubes running longitudinally inside the drum.
Conduction & Evaporation: Wet low-rank coal is fed into the drum shell, tumbling over the hot outer surfaces of the steam tubes as the drum rotates.
Moisture Discharge: Heat transfers via conduction, evaporating internal moisture from the coal without direct contact with flue gases or open flames.
Condensate Recovery: Water vapor is drawn off with a small sweep of air, while the steam inside the tubes condenses and is returned to the boiler system for closed-loop energy reuse.
Key Advantages
Superior Explosion Safety: Operating in a low-oxygen, indirect-heating environment eliminates open flames, drastically reducing dust explosion risks inherent to volatile low-rank coals.
Energy Recovery & Efficiency: Waste or low-pressure steam from nearby power plants or industrial boilers can be repurposed, driving down operational costs.
Minimal Coal Quality Degradation: Gentle indirect heat prevents volatile matter loss and over-cracking, preserving the coal's original structure and calorific upgrades.
Low Emissions: Because combustion gases do not touch the coal, exhaust volumes are tiny, making dust control and environmental compliance far easier.
Applications
Lignite & Sub-Bituminous Upgrading: Reducing moisture in low-rank coals from 30–50% down to market-ready levels prior to transport or combustion.
Mine-Mouth Power Plants: Pre-drying boiler feed coal using extraction steam to improve overall power plant efficiency and lower CO₂ intensity.
Coal Briquetting & Gasification: Preparing low-rank coal feedstock to meet strict moisture standards for gasifiers or briquetting operations.
Technical Specifications
Product Specs (m) |
Capacity(T/H) |
Main Motor Power |
Main Motor Mode1 |
Main Gearbox Model |
Ratio |
Weight (T) |
1.2x10m |
2.5 |
7.5 |
Y160M-R3 |
ZL50-16-1 |
13.5 |
|
1.5x12m |
3.3-4.9 |
10 |
Y160L-6B3 |
JZQ500-111-2F |
- |
18.9 |
1.5x15m |
4-6 |
18.5 |
Y200L-6 |
JZQ500-111-2F |
21 |
|
1.8x12m |
4-6 |
11 |
Y200L-6 |
ZQ50-1611-2 |
16.46 |
22.33 |
2.2x12m |
7-12 |
18.5 |
Y160L-6 |
JZQ650-111 |
31.5 |
37.6 |
2.2x14m |
7-12 |
18.5 |
Y160L-6 |
JZQ750-111 |
31.5 |
40 |
2.2x16m |
12 |
30 |
Y225M-6 |
JZQ750-11 |
31.5 |
45 |
2.4x14m |
12 |
30 |
Y250M-6 |
JZQ750-111 |
31.5 |
51 |
2.4x18m |
10-13 |
37 |
Y250M-6 |
ZL85-13-1 |
27.16 |
54 |
2.4x20m |
10-14 |
37 |
Y250M-6 |
ZL85-13-1 |
27.16 |
54.14 |
3x20m |
25 |
55 |
Y250M-4 |
ZL100-16-1 |
41.52 |
78 |
3x25m |
32-36 |
75 |
YR280M-4 |
ZL100-16-1 |
41.52 |
104.9 |
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