1. Overview

In the field of energy production, coal serves as a critical energy carrier, and its efficient and clean conversion relies heavily on reliable grinding equipment. However, traditional coal mills suffer from numerous drawbacks and limitations in practical application, restricting the improvement of energy utilization efficiency and production stability.

DaTongLongYuan has established in-depth cooperation with Beijing Power Equipment Group. The two parties jointly launched the independently developed ZGM Series Medium-speed Coal Mill by Beijing Power Equipment Group. Developed based on core industry demands and integrating the technical strengths of both sides, the series features profound technological accumulation, innovative design concepts and reliable performance. It addresses industry pain points with advanced technologies and provides efficient and reliable solutions for energy production. Currently, the ZGM Series Medium-speed Coal Mill has become a mainstream choice for coal-fired power stations, industrial boilers and other fields.

2. Drawbacks and Limitations of Traditional Grinding Technology

（1）In the process of coal grinding and energy conversion, traditional equipment faces multiple challenges. In terms of material adaptability, coal types on the market are diverse with fluctuating quality. Some equipment shows poor adaptability to varying coal qualities, resulting in low grinding efficiency and unstable output.

（2）Small and medium-sized iron impurities mixed in coal materials cannot be effectively discharged, which not only impairs grinding performance but also may cause equipment damage.

（3）In terms of operating costs, traditional fixed loading modes cannot be flexibly adjusted according to load changes. This leads to excessive power consumption under medium and low load conditions, accelerated wear of wear-resistant parts, shortened service life, and increased equipment maintenance costs and shutdown frequency.

（4）In terms of safety and environmental protection, some equipment suffers from poor sealing performance, prone to dust leakage that pollutes the working environment. Insufficient explosion-proof capability poses hidden dangers to production safety, and leakage of traditional slag discharge systems further undermines production safety and civilized operation.

（5）In addition, complicated equipment maintenance procedures and time-consuming spare parts replacement seriously affect the continuity of production.

3. Solutions

Targeting the above pain points of traditional grinding technology, the ZGM Series Medium-speed Coal Mill delivers a comprehensive set of solutions.

（1）Material Adaptability and Grinding Efficiency Improvement

Adopting differentiated roller profile design combined with hydraulic variable loading technology, the mill automatically adjusts operating conditions according to coal characteristics and load changes. It achieves high-efficiency adaptation to various coal qualities and enhances the self-discharge capability of impurities in coal materials.

（2）Operating Cost Reduction

The hydraulic variable loading technology dynamically adjusts the loading force to reduce energy consumption and wear of wear-resistant parts under medium and low loads. Equipped with multiple high-hardness wear-resistant component options, it greatly extends equipment service life and cuts maintenance costs.

（3）Safety and Environmental Protection

The optimized sealing structure, together with patented dynamic rotary separator and specially designed nozzle ring, reduces dust leakage. The upgraded explosion-proof grade of the mill body ensures production safety. The innovative isobaric sealed slag discharge system fundamentally eliminates slag discharge leakage and dust pollution, realizing clean production.

（4）Maintenance Optimization

Adopting the flip-roller structural design simplifies spare parts replacement procedures, shortens maintenance shutdown time, and guarantees production continuity.

（5）Full-cycle Engineering Services

Based on on-site actual conditions and personalized customer requirements, DaTongLongYuan provides full-lifecycle services covering scheme design, engineering design, installation, commissioning and after-sales maintenance. The professional technical team formulates customized solutions according to actual working conditions, capacity demands and environmental protection standards. Construction is undertaken by certified professional personnel with complete professional tools to ensure safe, accurate, efficient and orderly installation. Upon completion of installation, comprehensive no-load and load commissioning is conducted to ensure all performance indicators meet production and user requirements.

（6）Comprehensive After-sales Service System

DaTongLongYuan has established a sound after-sales service system, providing continuous support including equipment maintenance training, spare parts supply and emergency fault handling. It offers 24-hour rapid response to user demands to ensure long-term continuous and stable equipment operation. Leveraging rich industry experience and technological accumulation, the company provides professional technical consultation and guidance to help users optimize equipment efficiency.

4. Unique Technical Advantages of ZGM Series Medium-speed Coal Mill

Inheriting advanced technological genes from Germany and Babcock of the United States, the ZGM Series Medium-speed Coal Mill boasts outstanding advantages after innovative upgrading, featuring large-diameter grinding rollers with independent roller sleeves, high loading force, low peripheral linear speed of the grinding ring, and foundation bolt borne loading force design. Its specific strengths are as follows:

（1）High-efficiency and Intelligent Core Technology

● Hydraulic Variable Loading Regulation

It dynamically adapts to load variations with high loading under high load and low loading under low load via online automatic control. The technology expands the unit peak regulation capacity, significantly reduces pulverizing power consumption, extends the service life of wear-resistant parts, and features easy operation. Under medium and low load conditions, pulverizing power consumption is reduced by about 30% compared with traditional fixed-loading coal mills (actual energy saving varies with working conditions), while effectively lowering wear of roller sleeves and liners and greatly prolonging service life.

● Differentiated Grinding Roller Profile

The differentiated grinding profile design precisely adapts to various coal characteristics, improving grinding efficiency and reducing energy consumption. It flexibly copes with coal quality fluctuations in the market with stronger coal adaptability and better grinding effect.

● Patented Rotary Separator

Specially designed and nationally patented, the separator flexibly matches boiler primary air ratio, coal combustion volume and pulverized coal fineness requirements. It greatly improves the uniformity and efficiency of pulverizing and optimizes the pulverizing performance of the coal mill.

（2）Reliable and Durable Structural Design

● Large-diameter Independent Grinding Roller

With loading force borne by foundation bolts, it delivers high operational stability. Three optional roller diameters are available, exceeding similar models in dimensional specification. The output decline rate shall not exceed 5% after wear of wear-resistant parts.

● Special Rotary Nozzle Ring

Dual horizontal and vertical gaps are arranged between the stationary ring and moving ring, effectively avoiding scouring and wear of the stationary ring by primary hot air, greatly extending the service life of the nozzle ring and facilitating easy maintenance.

● Enhanced Safety and Efficiency Design

The mill body explosion-proof grade is upgraded from 0.1MPa to 0.35MPa to ensure safe and stable operation. Slag discharge volume is reduced by 15%-25% compared with peer products, effectively lowering energy waste and further improving overall operational efficiency.

（3）Strong Wear Resistance and Adaptability

● Diversified Wear-resistant Options

Three types of roller sleeves are available: casting, surfacing welding and ceramics, with maximum hardness up to HRC66. They adapt to different coal quality demands and feature long service life of wear-resistant parts.

● Local Anti-wear Reinforcement

Vulnerable parts are protected by high-chromium surfacing plates or wear-resistant ceramics, with a service life over 2.5 times that of ordinary materials, further extending the overall service cycle of equipment.

● Outstanding Impurity Self-discharge Capability

Grinding rollers swing flexibly during operation to efficiently discharge small and medium-sized iron impurities in materials. It is especially suitable for complex scenarios with drastic coal quality fluctuations and features wide material adaptability.

（4）Remarkable Operation, Maintenance and Energy-saving Advantages

● Rapid Maintenance Design

The flip-roller structure eliminates the need to dismantle the separator. Roller replacement can be completed within one day, greatly shortening shutdown time and reducing operation and maintenance costs.

● Fast Load Response

It quickly adapts to dynamic changes in working conditions and timely matches boiler coal demand to ensure production continuity.

● Eco-friendly and Compliance Performance

Equipped with an isobaric sealed slag discharge system, it achieves excellent sealing with zero dust leakage, realizing safe and civilized operation of the boiler system, protecting on-site personnel safety and meeting environmental protection standards.

（5）Rich Optional Renovation Solutions

A variety of customized solutions are supported, including wear-resistant component renovation, mill body and local purging anti-wear renovation, flip-roller renovation, and isobaric slag discharge renovation. Solutions can be flexibly selected according to actual working conditions and demands to further optimize equipment performance and application experience.

5. Future Outlook

Against the future development trend of green low-carbon, high-efficiency and intelligent energy industry, the ZGM Series Medium-speed Coal Mill will continue to deepen technological innovation.

（1）Intelligent Upgrading

More intelligent perception and data analysis functions will be integrated to realize real-time operation monitoring, fault early warning and intelligent regulation, further improving operational efficiency and reliability.

（2）Energy Saving and Consumption Reduction

The hydraulic variable loading system and grinding structure design will be continuously optimized, and new energy-saving materials will be explored to further reduce unit energy consumption and support the realization of carbon peaking and carbon neutrality goals. To meet diversified energy demands, the product application scope will be expanded with customized models adapting to more fuel types and application scenarios to satisfy grinding needs across various industries.

（3）Environmental Protection and Safety Improvement

Further upgrade equipment sealing performance and environmental indicators, explore more efficient dust collection and solid waste treatment solutions, and promote full greening of the production process.

（4）Full-lifecycle Service Optimization

Continuously optimize equipment structural design and simplify maintenance procedures. Combined with digital technology, a full-lifecycle service system will be built to provide more convenient and efficient operation and maintenance support, facilitating high-quality and sustainable development of the energy production industry.