Lignite Dryer

Industrial Low-Temperature Anti-Combustion Rotary Dryer for High-Moisture Brown Coal Upgrading

Our professional lignite dryer is specially developed for the physical characteristics of high-moisture, low-calorific, flammable and fragile lignite (brown coal). Adopting optimized low-temperature staged negative pressure drying technology, it completely solves the core industry pain points of lignite spontaneous combustion and pulverization during drying. It stably reduces raw lignite moisture from 35%-60% to standard 10%-18%, increases coal calorific value by more than 30%, and realizes safe, efficient and high-value upgrading of lignite resources.

Anti-Stick Host

Explosion-Proof

PLC Control

+86-19103863728

[email protected]

+86-19103863728

[email protected]

What is Lignite Dryer?

Lignite, also known as brown coal, is a low-rank coal with abundant reserves worldwide. It features ultra-high internal and surface moisture, loose texture, low combustion calorific value, and is extremely easy to oxidize, pulverize and spontaneously combust when exposed to air. Raw lignite cannot be stored for a long time, has poor transportation performance, and is difficult to burn fully, resulting in extremely low market value and serious resource waste.
What is Lignite Dryer?
Contents

Complete Equipment Composition of Lignite Dryer

Lignite Special Rotary Drum Host (Core Part)

The industrial heavy-duty rotary drum is optimized with multi-stage segmented temperature control structure and lignite-specific low-abrasion lifting plates. Different from ordinary coal dryers, the internal lifting and flipping track is designed for loose lignite texture, which gently lifts and scatters materials to form a uniform material curtain. It avoids violent collision and crushing of lignite particles, effectively prevents pulverization, and ensures full and uniform heat exchange without local overheating.

Low-Temperature Staged Hot Air Heating System

Equipped with graded temperature control heating system, divided into pre-drying, constant-temperature dehydration and cooling stabilization stages. The temperature is strictly controlled below 300℃ in the high-temperature section and gradually reduced in the later stage. It avoids lignite coking and spontaneous combustion caused by high-temperature baking, realizes scientific low-temperature gradual dehydration, and protects lignite combustion activity and calorific value.

Uniform Quantitative Feeding & Sealed Conveying Device

Customized sealed quantitative feeding equipment for loose lignite materials. It realizes uniform and continuous feeding, prevents material accumulation and local overheating caused by uneven feeding. The fully sealed conveying structure avoids lignite dust overflow and air contact oxidation in advance, ensuring stable drying quality and production safety.

Negative Pressure Dust Removal & Explosion-Proof System

The whole machine operates under slight negative pressure, equipped with multi-stage cyclone dust removal and bag dust collection dual system. It is matched with professional explosion venting and pressure relief devices for lignite flammable characteristics. It completely collects fine lignite dust, eliminates dust explosion risks, realizes zero dust pollution, and meets global coal mine safety and environmental protection standards.

Intelligent PLC Staged Temperature Control Cabinet

Intelligent automatic control system, supporting independent adjustment of temperature, wind speed and drum speed in each drying stage according to raw lignite moisture. Equipped with real-time temperature monitoring, over-temperature alarm and automatic power-off protection functions. It realizes 24-hour unmanned safe operation, effectively avoiding manual operation errors leading to lignite safety accidents.

Complete Equipment Composition of Lignite Dryer

Core Product Advantages of Lignite Dryer

1. Low-Temperature Staged Drying, No Spontaneous Combustion

Aiming at the flammable and oxidizable characteristics of lignite, the equipment adopts segmented low-temperature gradual drying technology. Step-by-step dehydration from low temperature to constant temperature avoids local high-temperature baking, thoroughly solves the industry pain point of lignite spontaneous combustion and caking during drying, and ensures 100% safe production.

2. Anti-Pulverization Design, Complete Particle Retention

Optimized low-abrasion lifting structure and gentle material flipping mode reduce material collision and friction. It effectively avoids lignite particle breakage and excessive fine powder generation caused by traditional high-speed drying. The finished lignite maintains complete particle shape, low dust content and higher market selling value.

3. Significant Calorific Value Upgrade

The low-temperature gradual drying mode will not damage the internal combustion structure of lignite. After thorough removal of internal and surface moisture, the combustion efficiency of lignite is greatly improved, and the calorific value is increased by more than 30%. The upgraded lignite has stable combustion performance and no waste combustion, realizing maximum resource value release.

4. Negative Pressure Closed Operation, Green & Safe

The whole drying process adopts negative pressure fully sealed design, which fundamentally suppresses lignite dust overflow and material loss. The matched explosion-proof and pressure relief device eliminates hidden dangers of dust explosion. It meets strict environmental protection and safety standards of modern coal mines, realizing clean and safe production.

5. Strong Material Adaptability & Stable Quality

It is fully adapted to various types of high-moisture lignite and weathered brown coal. The staged temperature control system can intelligently adjust parameters according to different raw coal moisture and texture. The finished lignite has uniform moisture, stable quality and no secondary moisture regain, solving the problem of difficult storage of raw lignite.

6. High Efficiency & Low Operating Cost

The optimized internal heat exchange track prolongs effective heat exchange time, improves thermal utilization rate, and reduces comprehensive energy consumption. The industrial heavy-duty body supports 24-hour long-term high-load continuous operation, with low failure rate and simple daily maintenance, suitable for large-scale lignite centralized upgrading projects.
Core Product Advantages of Lignite Dryer

Working Principle & Production Process of Lignite Dryer

Working Principle

The lignite dryer adopts industry-leading low-temperature staged negative pressure drying principle, specially designed for loose, high-moisture and flammable lignite materials. Wet raw lignite is evenly and quantitatively sent into the rotary drum through the sealed feeding system. With the slow rotation of the drum, the low-abrasion lifting plates gently lift and scatter lignite particles to form a uniform floating material curtain.
The materials pass through three professional drying stages in turn: low-temperature pre-drying stage to evaporate surface free water, medium constant-temperature deep dehydration stage to remove internal bound water, and low-temperature cooling stabilization stage to lock dryness. The whole process avoids high-temperature overheating and violent friction, effectively preventing lignite coking, pulverization and spontaneous combustion. Water vapor and fine dust are purified and discharged through the negative pressure dust removal system, and the high-quality upgraded lignite with stable moisture and complete particles is discharged to complete the safe and efficient drying and upgrading process.

Standard Production Flow

Wet Lignite Feeding → Sealed Uniform Conveying → Low-Temperature Pre-Drying → Medium-Temperature Deep Dehydration → Cooling & Moisture Stabilization → Explosion-Proof Dust Removal & Purification → Dry Upgraded Lignite Discharging → Storage / Power Generation / Sales
Working Principle & Production Process of Lignite Dryer
Working Principle & Production Process of Lignite Dryer 02

Application Scenarios of Lignite Dryer

This professional lignite dryer is exclusively used for drying and upgrading various high-moisture lignite (brown coal), widely applicable to large lignite mines, coal preparation plants, thermal power plants and lignite deep processing bases. It solves the pain points of raw lignite’s low calorific value, difficult storage, easy spontaneous combustion and low utilization rate. The upgraded lignite can be directly used for industrial boiler combustion, thermal power generation, commercial coal sales and coal blending processing, effectively activating low-value lignite resources and creating considerable economic benefits for coal enterprises.
Core Application Fields: Lignite resource upgrading, brown coal deep processing, power plant fuel pretreatment, lignite mine waste value-added utilization, large-scale coal green drying project
Application Scenarios of Lignite Dryer
Application Scenarios of Lignite Dryer 02

Real Project Cases of Lignite Dryer

Case 1: 15T/H Lignite Upgrading Project | Indonesia Lignite Mine

Project Info: The local lignite has extremely high moisture of 55%-60%, low calorific value and cannot be sold directly. The customer adopted our dedicated low-temperature lignite dryer, abandoning traditional high-temperature drying mode. After staged gradual drying, the lignite moisture is stably controlled at 15%, with no particle pulverization or spontaneous combustion. The coal calorific value is increased by 32%, and the finished lignite is sold as high-quality commercial coal, achieving a huge profit increase.

Case 2: 10T/H Brown Coal Drying Project | Mongolia Coal Mine

Project Info: Facing the problems of easy oxidation and spontaneous combustion of weathered lignite, the customer chose our negative pressure closed-loop lignite dryer. The fully sealed low-temperature operation completely eliminates safety hazards. The anti-pulverization design retains complete lignite particles, improves coal appearance and quality. The upgraded lignite is used for local power generation and industrial combustion, greatly reducing enterprise fuel procurement costs.

Case 3: 8T/H Lignite Deep Processing Project | Thailand Energy Plant

Project Info: The customer needs stable low-moisture lignite for deep coal processing. Our lignite dryer realizes precise moisture control and uniform drying effect. No caking, no pulverization, no quality damage. The stable and high-quality dried lignite provides reliable raw materials for subsequent deep processing, with stable equipment operation and zero safety accidents in long-term operation.
Real Project Cases of Lignite Dryer
Real Project Cases of Lignite Dryer 02

Technical Parameters of Lignite Dryer

Spec Inner diameter of cylinder (mm) Tube length (mm) Slope(°) Speed (r/min) Motor Power (Kw) Capacity (t/h) Inlet temperature (℃) Weight(t)
Ф1.0X10m 1000 10000 2.5 3.4 4 0.6~1.8 ≤700℃ 5.6
Ф1.2X12m 1200 12000 2.5 3.4 11 0.8~2.5 15
Ф1.5X14m 1500 14000 2.5 3.4 15 1.8～4 19.6
Ф1.8X15m 1800 15000 2.5 4.04 18.5 2.8～6.5 25
Ф1.8X20m 1800 20000 2.5 3.1 22 5～8 32.2
Ф2.0X18m 2000 18000 2.5 3.16 30 6～10 38.8
Ф2.2X20m 2200 20000 2.5 3.68 37 6.5～11 47
Ф2.2X22m 2200 22000 2.2 2.9 37 7～12 50
Ф2.4X22m 2400 22000 2.5 3.27 45 7.5～14 62
Ф2.6X24m 2600 24000 2.5 3.2 55 8～17 72.5
Ф2.8X22m 2800 22000 2.5 3.4 132 28～32 94
Ф3.0X28m 3000 28000 2.5 3.2 75 32～36 105
Ф3.2X30m 3200 30000 3-5 3.2 90 43～50 700-800℃ 118
Ф3.6X32m 3600 32000 3-5 3.0 160 60～76 143
Ф4.0X36m 4000 36000 3-5 3.0 200 82～90 189
Ф4.6X42m 4600 42000 3-5 3.0 280 100～110 290

Note: Production capacity will vary with product composition and water content.

Get Custom Lignite Drying Solution

Our professional lignite dryer is tailor-made for low-value high-moisture lignite resources. With core advantages of low-temperature anti-spontaneous combustion, anti-pulverization and calorific value upgrading, it solves various bottlenecks of traditional lignite drying. It helps global lignite mines and energy enterprises realize low-value coal resource upgrading, reduce safety risks, increase coal market value and create long-term stable economic benefits.
Contact us now to get free equipment quotation, customized model selection and professional lignite upgrading project solution!
Get Custom Lignite Drying Solution

FAQs of Lignite Dryer

Q1: Why can’t ordinary coal dryers dry lignite?
A: Lignite has loose texture, high internal moisture and extremely low ignition point. Ordinary dryers adopt high-temperature rapid drying and high wind speed flipping, which will cause lignite local overheating, coking, serious pulverization and even spontaneous combustion accidents. Our professional lignite dryer uses low-temperature staged gradual drying and anti-pulverization structure, which is the only safe and efficient drying solution for lignite upgrading.
Q2: Can the dryer completely avoid lignite spontaneous combustion?
A: Yes. The equipment adopts three major anti-combustion designs: low-temperature staged temperature control (no high-temperature baking), negative pressure closed operation (reducing air oxidation), and real-time over-temperature alarm protection. It fundamentally eliminates lignite spontaneous combustion and caking risks during drying, ensuring safe production.
Q3: How much calorific value can dried lignite be improved?
A: After professional low-temperature drying, the internal and surface moisture of lignite is completely removed without damaging its internal fuel structure. The combustion efficiency is significantly improved, and the calorific value can be steadily increased by more than 30%. The drier lignite burns fully with no residue, greatly improving industrial utilization value.
Q4: What is the best moisture range for upgraded lignite?
A: For commercial sales, power generation and industrial combustion, the optimal moisture of upgraded lignite is 10%-18%. Within this range, lignite has stable texture, no secondary moisture regain, no spontaneous combustion during storage and transportation, and fully meets international industrial coal standards.
Q5: Will drying cause lignite particle pulverization?
A: No. Different from ordinary dryers with violent flipping, our lignite-specific low-abrasion lifting structure realizes gentle material scattering and heat exchange. It avoids severe collision and friction of lignite particles, effectively reducing fine powder generation and retaining complete particle shape and high coal grade.

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