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To prevent accidents and shorten construction timelines, automated cement-hopper cleaning equipment is here!
Release time:2022-09-14
[Internal Cement Report] On January 9, a cement enterprise in Hebei experienced a severe collapse of the silo wall during inventory clearance operations, resulting in a major safety accident that claimed six lives. This incident has promptly brought the issue of safety in inventory-clearing operations at cement enterprises to the forefront of public attention. According to information obtained by the Internal Cement Report, in recent years, there have been numerous accidents involving casualties caused by inventory-clearing activities in China’s cement industry. For example:
Cement Silo Cleaning Accident at a Cement Company in Yakeshi: On January 21, 2008, a worker from the company fell while cleaning the walls of a cement silo and was buried under cement. Three other workers who attempted to rescue him were also buried in the process. After being rescued, all four individuals succumbed to their injuries despite emergency medical efforts, resulting in four fatalities.
Cement Silo Cleaning Accident at a Cement Plant in Liangping: On October 10, 2008, several workers were cleaning inside a clinker silo when a large chunk of cement weighing about 2 tons collapsed, resulting in two deaths and one injury.
Accident in a Xinjiang Cement Workshop: On the afternoon of July 18, 2008, a batching worker from the company’s cement workshop entered the cement blending warehouse alone to address a problem with the smooth flow of blended materials. While working, he accidentally fell into a steel silo. After more than 40 minutes of rescue efforts by personnel at the scene, he was pulled out and taken to the hospital, where he was pronounced dead.
One person died in an accident at a homogenization silo at a certain factory on Mount Tai: On November 26, 2008, the shift supervisor of the kiln workshop led workers to clean Silo No. 6 for pyrophyllite. During the work, they used oxy-acetylene cutting to open the discharge port and manhole. After dismantling the discharge valve, the first worker who descended into the silo was found dead, as confirmed by paramedics from the 120 emergency service.
Accident at a Cement Plant in Fuzhou: On May 4, 2009, five workers who were cleaning waste residue from the inner walls of a slag storage bin were buried by collapsing waste residue and died of asphyxiation.
Accident at a Cement Plant in Chaohu: On June 27, 2009, Ding, a member of the slag-drying crew, attempted to clear a blockage at the bottom of the slag discharge hopper (discharge funnel). His efforts were unsuccessful. Subsequently, Ding climbed down from the top of the ground-level storage bin and began manually clearing the blocked material from above. Since there was no one on site to supervise him, Ding was swept into the storage bin along with a stream of slag pushed by a bulldozer. It wasn't until noon—12:00 p.m.—that Ding was finally found, but he had already died of asphyxiation.
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The tragedies caused by various safety accidents remain vividly etched in our memories, yet they consistently fail to elicit serious attention from major cement companies and contractors responsible for silo-cleaning operations, leading to frequent safety incidents during silo-cleaning. So, how can cement companies ensure safe silo-cleaning practices? To address this question, we conducted an in-depth discussion with the head of Guangzhou Daisler Industrial Equipment Co., Ltd. (hereinafter referred to as “Daisler”), a well-known domestic company that is actively involved in the research and development of silo-cleaning equipment.
According to Mr. Deng Youquan, Technical Manager at Daisler, various factors cause powdered materials inside silos to easily adhere to the inner walls and accumulate at the bottom of the silo, thereby reducing the silo’s capacity and leading to poor or even impossible discharge. To ensure continuous system production, companies must carry out scheduled and regular silo-cleaning operations. However, currently, many problems exist in silo-cleaning practices within China’s cement industry.
First, many cement companies still rely on manual labor to clear stockpiles, a practice that inherently carries significant risks. Analysis of past safety accidents in the cement industry shows that stockpile-clearing operations are the leading cause of worker fatalities.
Second, the labor costs involved in manual warehouse cleaning will be extremely high. Currently, the industry’s standard fee for warehouse cleaning is roughly between 60,000 and 120,000 yuan per warehouse. As people’s awareness of safety continues to rise, fewer and fewer workers are willing to enter warehouses to carry out cleaning operations, meaning that labor costs will steadily increase year after year in the future.
In addition, traditional manual cleaning of storage bins is time-consuming. Cleaning storage bins is a challenging and complex task. To ensure safety, manual cleaning must be carried out from top to bottom; therefore, the time required to clean a single bin can range from several weeks to even several months, depending on the amount of material accumulated inside the bin.
Recognizing the various hazards that manual bin-cleaning practices pose to both cement companies and the workers involved, as well as the substantial costs that cement plants incur as a result, Daisler has stepped up its efforts in researching, developing, and introducing automated bin-cleaning equipment. According to Mr. Deng Youquan, pneumatic bin-cleaning equipment is already widely used overseas for cleaning storage bins of various materials—including cement, steel, energy, minerals, lime, food, and other industries—and has become the safest and most efficient bin-cleaning equipment currently in widespread global use.
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