Evolution of Our Expertise in Anti-Blocking

Datong Longyuan has pioneered solutions for material flow obstruction challenges in fuel conveying systems at coal-fired power plants, accumulating extensive experience and profound technical expertise in this field. In 2012, the company partnered with Shenhua Guohua Electric Power Research Institute to conduct groundbreaking research on flow obstruction caused by high-moisture lignite in Indonesia. This collaboration yielded specialized unblocking technologies, resulting in co-patented innovations and published research papers.

Currently, the company's anti-clogging systems provide end-to-end coverage for bulk material handling processes in coal-fired power plants and industrial coal utilization systems. Our solutions effectively eliminate blockages throughout the entire material flow chain—from large-scale coal storage silos and unloading terminal bunkers, through transfer chutes and crusher systems, to raw coal bunkers, feeder outlets, and CFB boiler feed chutes.

Analysis of Coal Blockage Causes in Power Plant Raw Coal Bunkers

Extensive field observations indicate that blockages in boiler raw coal bunkers predominantly occur within a 3-meter zone above the discharge outlet, typically spanning less than 2 meters in width. Ensuring smooth fuel flow requires effective mitigation of obstructions in this critical region. Detailed analysis reveals that coal bunker blockages in thermal power plants primarily result from three key factors:

1.Coal Composition Factors: Some power plants co-fire sludge with coal, and this complex fuel composition significantly increases the risk of clogging.

2.Bunker Structural Design Flaws: Non-standard bunker geometries (e.g., irregularly shaped bunkers) are more prone to blockages compared to conventional designs due to their unique structural characteristics.

3.Coal Flow Rate Mismatch: The gravitational flow rate of coal inside the bunker often exceeds the feed rate of the downstream coal feeder.

Excess coal begins to compact at the feeder inlet and gradually propagates upward, eventually leading to complete bunker blockage. This occurs because the bunker and coal chute lack flow control capability, while the coal feeder adjusts its discharge rate to meet varying mill system demands. As a result, not all gravitationally discharged coal can be conveyed downstream, causing accumulation and compaction at the tail end of the feeder inlet chute. This process forms a "rat hole" (funnel flow pattern) until the bunker becomes fully obstructed.

Innovative Solution: Dual Rotary Blade Anti-Clogging System for Slide Gates

During routine operations in coal-fired power plants, material flow obstruction represents a persistent operational challenge. Coal blockages not only reduce unit load capacity but may also trigger flameout-induced trip events. To address this problem, the dual  rotary blade anti-clogging system for slide gates has been developed. With its high efficiency, leak-proof sealing, and thorough clogging resolution, it has become a reliable solution for ensuring smooth material flow.

The system employs an externally mounted geared motor to drive rotating blades. As the blades rotate relative to the bunker wall, they separate the coal flow from the wall surface while simultaneously agitating the bulk material. During this process, the rotating blades generate downward propulsion force, activating material flow in prone-to-clog zones. This mechanism eliminates coal-wall adhesion while creating downward disturbance, effectively destroying material bridging, arching, and blockages.

Operational experience shows that blockages in boiler raw coal bunkers primarily occur within 3 meters above the outlet and span less than 2 meters in width. Only by resolving clogs in this critical zone can uninterrupted fuel discharge be ensured.

Based on the third clogging cause analysis, maintaining continuous material flow in the slide gate-to-feeder inlet segment is essential for preventing bunker blockages. Our engineered solution implements:The section from the coal bunker outlet to the coal feeder is a key part of coal bunker anti-blocking. According to the analysis of the coal blocking causes in the third point above, we know that to ensure that the coal bunker is not blocked, the section from the shutter door to the inlet of the coal feeder must maintain a continuous flow state of materials. For this reason, within the range of 3 meters upward from the inlet of the coal feeder, we have designed a rotary blockage removal device with upper and lower scrapers for the shutter door + a pneumatic blowing blockage removal device for the upper coal bunker. The system runs automatically on a regular basis to activate the materials in the easily blocked section. The rotary blockage removal device with the lower scraper of the shutter door is mainly used to ensure that the bottleneck section from the coal bunker to the inlet of the coal feeder is not blocked. The upper scraper of the shutter door and the pneumatic blowing blockage removal device ensure that no agglomeration and blockage occur below a certain cross-sectional diameter of the coal bunker, so as to ensure that the upper coal bunker does not form an arch under the action of its own weight, and finally ensure that the coal bunker system is completely free of coal blockage.

Technical Features

No powder leakage: Datong Longyuan's latest rotary blade clearing system completely resolves dust leakage issues prevalent in the industry. The equipment can operate continuously throughout an entire maintenance cycle without any powder leakage.

On-line seal replacement: The latest rotary scraper blockage removal device independently developed by Datong Longyuan realizes on-line seal replacement. The seal can be replaced without disassembling the equipment.

Complete Clogging Resolution: Datong Longyuan's integrated blade-airknife unblocking system provides definitive solutions for coal blockage issues in coal-fired power plants, including those caused by co-firing sludge and coal slurry. The system thoroughly addresses persistent clogging problems that remain unresolved by traditional methods such as bunker rotation technology or shrimp-bend modifications.

Market Recognition and Future Outlook

Datong Longyuan's Rotary Unblocking System has earned widespread recognition from domestic and international clients through its exceptional performance and high-efficiency service. Their trust serves as the driving force for our continuous advancement.

With ongoing technological innovation and growing market demands, Datong Longyuan remains committed to expanding R&D investments in rotary unblocking technology. We strive to deliver more efficient and intelligent bulk material handling solutions, empowering industrial production to reach higher standards. Our mission is to provide reliable and innovative clogging prevention systems, contributing to seamless material flow in industrial processes worldwide.