Lignite Dryer

Introduction to Lignite Dryer

Lignite dryer is a type of rotary equipment designed specifically for dewatering lignite coal. It is also known as brown coal dryer or wood coal drying machine. The lignite dryer enables continuous, industrial-grade, and automatic operation. It is specifically tailored to the unique characteristics of lignite coal.

Zoneding Machine has developed advanced lignite drying technology to ensure that the quality of lignite and coal slime remains unchanged after the drying process. Our engineers focus on controlling the temperature of the scorching wind and the rotating speed of the dryer to achieve higher drying efficiency.

By using Zoneding’s lignite coal dryer machine, the moisture content of coal slime can be reduced to below 13%, which in turn improves its combustion efficiency.

There are several reasons why lignite needs to be dried:

1. Volatile content and smoke generation: Lignite contains a high level of volatile elements, which makes it prone to burning and generating smoke. Drying lignite helps reduce its volatile content, improving its combustion efficiency and reducing smoke emissions.
2. Environmental pollution: Lignite has a high ash content of about 6-19%, which can lead to significant environmental pollution when burned. Drying lignite can help remove moisture and impurities, reducing its ash content and minimizing environmental pollution.
3. Storage and transportation: Lignite has a high moisture content, which makes it prone to self-ignition and difficult to store and transport. By drying lignite, its moisture content is reduced, allowing for easier and safer storage and transportation.
4. Alternative fuel: In cases where traditional coal cannot meet the fuel requirements, lignite is often used as an alternative. Drying lignite improves its heating value and suitability as a fuel source.

The applications of dried lignite are wide-ranging. It is commonly used in thermal power plants, chemical industries, metal recycling, and as catalyst supports, adsorbents, and for sewage purification. Additionally, lignite dryer machines can also be used to dry other materials such as fly ash, coke, coal, and various granular, paste, and powder materials.

Please keep in mind that the information provided is based on general knowledge, and specific applications and requirements may vary. It is always recommended to consult with professionals to determine the best drying process for your specific needs.

Lignite Dryer

The lignite rotary dryer has various applications in different industries, including:

1. Coal industry: It can effectively dry coal slime, raw coal, and various fine coal materials.
2. Ore processing and mining: The lignite dryer can be used for drying iron powder, copper powder, zinc powder, and other metal granular materials.
3. Building materials: It is suitable for drying materials such as clay, limestone, sand, silica/quartz sand, bentonite, and slag, which are commonly used in the construction industry.
4. Metallurgy: The lignite rotary dryer can be used to dry non-thermally sensitive materials in metallurgical processes.
5. Other materials: It is also suitable for drying various other powder and particle materials that require special drying treatment.

Please note that the specific applications may vary depending on the characteristics of the material and the requirements of the industry. It is always advised to consult with professionals to determine the suitability of the lignite dryer for your specific needs.

Liginite Dryer Application

The lignite dryer works in the following manner:

1. Wet lignite is fed into the crushing equipment: The initial step in the drying process is to feed the wet lignite into the crushing equipment. This helps to break down the larger chunks of lignite into smaller pieces, facilitating the drying process.
2. Low-temperature four-stage drying process: The lignite is subjected to a low-temperature four-stage drying process. In each stage, heat is applied to the lignite to effectively evaporate the moisture. The low-temperature drying process is designed to prevent the lignite from overheating or undergoing combustion.
3. Drying to the desired humidity: The aim of the drying process is to reduce the moisture content of the lignite to the desired level, typically 13% or below. This level of humidity is suitable for various applications and storage.
4. Industrialization, automation, and continuous production: The lignite dryer is designed to support industrial-level drying operations. It incorporates advanced technologies to ensure automation and continuous production, allowing for efficient and uninterrupted drying of the lignite.

It’s important to note that the specific operation and design of a lignite dryer can vary depending on the manufacturer and the specific requirements of the drying process.

Working Principle of Lignite Dryer

The lignite dryer typically incorporates four drying stages, each serving a specific function in the drying process:

1. First Level (400 ℃): In this stage, high temperatures are employed to remove a significant portion of the moisture from the lignite. The aim is to reduce the moisture content without causing significant changes to the lignite’s chemical composition.
2. Second Level (300 ℃): This stage utilizes a strong wind or airflow to ensure efficient drying of the lignite. The high-temperature airflow helps prevent the lignite from coking, which can occur when excessive heat causes the formation of solid carbonaceous residue.
3. Third Level (120-210℃): The third stage involves the use of cleaning devices inside the drying cylinder. Wet lignite flows into the cylinder, where it is dried further. The cleaning devices help to break down larger lignite particles, exposing more surface area for efficient drying.
4. Fourth Level (60-80℃): The fourth stage is characterized by low-temperature drying. The induced draft system generates a low-temperature current or airflow, which aids in the removal of remaining moisture from the lignite. This stage helps to achieve the desired level of humidity in the dried lignite.

By incorporating these four drying stages, the lignite dryer ensures effective and gradual removal of moisture from the lignite while maintaining its properties and preventing problems such as coking. It is worth noting that the specific temperature ranges and functions of each stage may vary depending on the design and specifications of the lignite dryer.

The Zoneding Lignite Drying Machine offers several advantages:

1. Stable and Reliable Operation: The design of the machine includes zero horizontal thrust, reducing the bearing load on the retaining wheels. This ensures stable and reliable operation of the cylinder, enhancing its overall performance.
2. High Overload Capacity: The lignite dryer has a high capacity to bear overload, enabling it to handle large production volumes. This capability not only improves efficiency but also helps save fuel and reduce costs associated with lignite drying.
3. Improved Cleaning and Heat Transformation: The machine is equipped with a new structure that enhances the cleaning of lignite and promotes efficient heat transfer. This feature is particularly important for removing sticky slime from the inner wall of the dryer, ensuring optimal drying performance.
4. Energy-saving and Environmentally Friendly: By efficiently utilizing coal resources and reducing the emission concentration, the lignite dryer contributes to energy-saving and emission reduction objectives. It helps minimize the environmental impact associated with lignite drying processes.

In summary, the Zoneding Lignite Drying Machine offers reliable operation, high overload capacity, improved cleaning and heat transformation, and supports energy-saving and environmentally friendly lignite drying.

Lignite Dryers at Customer Sites

Zoneding Machine is a reputable manufacturer of lignite dryers and a prominent supplier of mining machines in China. With over 40 years of research and development experience, Zoneding has developed its own production series for lignite dryers. Since its establishment in 1982, Zoneding has formed strong partnerships with renowned universities, including Zhejiang University and Tsinghua University. These collaborations have contributed to the expertise and knowledge of Zoneding’s team.

Zoneding boasts a dedicated team of over 360 professional engineers who are available 24/7 to provide free and customized solutions. Whether you need assistance with lignite dryer pricing, specific solutions, or flow charts, you can connect with their engineers through online chat or by leaving an online message.

Zoneding Machine’s commitment to quality and customer satisfaction has made it a reliable choice for lignite dryer manufacturing.

General Specification

Spec./m (Dia.×Length)	Shell Cubage (m³)	Capacity (t/h)	Installation Obliquity (%)	Highest Inlet Air Temperature (℃)	Main Motor (kw)	Weight (t)
Φ1.2×8.0	9.0	1.9～2.4	3～5	700～800	7.5	9
Φ1.2×10	11.3	2.4～3.0	3～5	700～800	7.5	11
Φ1.5×12	21.2	4.5～5.7	3～5	700～800	15	18.5
Φ1.5×14	24.7	5.3～6.6	3～5	700～800	15	19.7
Φ1.5×15	26.5	5.7～7.1	3～5	700～800	15	20.5
Φ1.8×12	30.5	6.5～8.1	3～5	700～800	18.5	21.5
Φ1.8×14	35.6	7.6～9.5	3～5	700～800	18.5	23
Φ2.2×12	45.6	9.7～12.2	3～5	700～800	22	33.5
Φ2.2×14	53.2	11.4～14.2	3～5	700～800	22	36
Φ2.2×16	60.8	13.0～16.2	3～5	700～800	22	38
Φ2.4×14	63.3	13.5～16.9	3～5	700～800	37	45
Φ2.4×18	81.4	17.4～21.7	3～5	700～800	37	49
Φ2.4×20	90.4	19.3～24.1	3～5	700～800	45	54
Φ2.4×22	99.5	21.2～26.5	3～5	700～800	45	58
Φ2.6×24	127.4	27.2～34.0	3～5	700～800	55	73
Φ3.0×20	141.3	30.1～37.7	3～5	700～800	75	85
Φ3.0×25	176.6	37.7～47.1	3～5	700～800	75	95
Φ3.2×25	201	42.9～53.6	3～5	700～800	90	110
Φ3.6×28	285	60.8～76.0	3～5	700～800	160	135

Technical parameters of indirect heat dryer:

Shell  diameter ×shell  Length   Items	Inside  diameter  of outer  shell (mm)	Inside  diameter  of inner  shell (mm)	Shell  Length (m)	Shell  cubage (m³)	Shell  obliquity	Lifting  blade  form	Highest  inlet air  temperature (℃)	Dimensions (m)
Φ1.5×15m	1500	500	15	20.27	3-5%	Lifting form	850	16.2×2.7×2.7
Φ1.5×17m			17	22.97				18.2×2.7×2.7
Φ1.5×19m			19	25.68				20.0×2.9×2.9
Φ1.8×21m	1800	650	21	35.91	3-5%	Lifting form	850	22.5×2.7×2.7
Φ1.8×23m			23	39.33				24.5×2.9×2.9
Φ1.8×25m			25	42.75				26.5×2.9×2.9
Φ2.2×21m	2200	800	21	58.10	3-5%	Lifting form	850	—-
Φ2.2×23m			23	63.61
Φ2.2×25m			25	69.15

Please note that the information provided is subject to change as technology evolves. Zoneding Machine reserves the right to change the data without prior notice. Machine performance may also vary depending on the specific application. For the most accurate and up-to-date details, it is recommended to chat online with Zoneding engineers. They will be able to provide you with the latest information, address any inquiries, and offer tailored solutions based on your requirements.