How to Increase Slurry Concentration: A Brief Discussion on Fine Grinding Technology

Thread Content

This post was last edited by jensse on 2012-5-5 at 18:07. At present, the concentration of our coal slurry has not even reached its maximum level; improving this concentration is something that we all desire. Here, we introduce the fine grinding technology of the **Coal Slurry Center, as well as the process technologies for producing high-concentration coal slurry from lower-grade coal. The technology for producing high-concentration slurry through graded grinding of lower-grade coal is a new generation of coal slurry preparation technology with independent intellectual property rights, developed by the China National Coal Research Institute (**Coal Slurry Engineering Technology Research Center**). This technology successfully integrates the concepts of \"selective graded grinding\" and \"optimized gradation\" into the development of slurry preparation processes. By improving the packing efficiency of coal slurries and utilizing efficient water-coal slurry additives, it enables an increase in the concentration of water-coal slurries by 3–5 percentage points, representing a major breakthrough in water-coal slurry preparation technology! A total of **1 invention patent and 4 utility model patents** have been obtained for this technology and its key equipment. This process technology has been applied in 6 fuel slurry production enterprises located in Dongguan, Shantou, Hangzhou, Fujian, Jiangsu and other places, resulting in a production capacity of 10 million tons per year. Since 2009, in the field of gasified water-coal slurry production, patent implementation licenses have been signed successively with companies such as Shanxi Yangmei Fengxi Fertilizer Co., Ltd., Yankuang Lunan Fertilizer Factory, Datang Hulunbuir Fertilizer Co., Ltd., Yankuang Yulin Energy Chemical Methanol Plant, Inner Mongolia Rongxin Chemical Company, and Henan Xinlianxin Fertilizer Co., Ltd. The goal is to increase the slurry concentration by more than 3 percentage points through the application of this patented technology, compared to the one-grinder (rod mill) process. At present, the gasification slurry production lines using this technology at Yankuang Lunan Fertilizer Plant and Shanxi Yangmei Fengxi Fertilizer Co., Ltd. have been successively upgraded and put into operation. Industrial production practice has shown that the concentration of the modified water-coal slurry increases by more than 3 percentage points, and the fluidity and stability of the coal slurry are improved ； The addition of fine pulp significantly improves the grinding efficiency of the rod mill, increasing its production capacity by 30%. Therefore, the advantages of the process technology for producing high-concentration water coal slurry from low-rank coal are as follows: 1. Advanced technology – Based on the characteristics of low-rank coal, and through systematic research into the properties of the coal, its grinding characteristics, and those of the resulting water coal slurry, this technology was developed by applying double-peak or multi-peak grading techniques, in line with the theory of packing efficiency; it represents a technology with independent intellectual property rights. It addresses the issues of the traditional single-refiner pulping process, such as poor adaptability to different coal types, difficulty in adjusting the particle size of the coal slurry, and high electricity consumption for pulping. Compared to traditional processes, the concentration is increased by more than 3 percentage points. 2. Mature technology and reliable operation: The production line that utilizes low-grade coal to produce high-concentration water-coal slurry was put into operation in February 2008, and it has been operating stably for nearly three years now. Production practice has shown that the production system is stable, process parameters are easy to control, and product quality is guaranteed. The process technology and equipment are mature and reliable, meeting the requirements of the tenderer. 3. High slurry concentration and low operating costs: Compared with traditional processes, the concentration of water-coal slurry is increased by 3–5 percentage points, which not only significantly improves gasification efficiency and reduces oxygen and coal consumption, but also extends the service life of the gasifier nozzles, decreases the number of shutdowns in the entire production system, and thus markedly lowers the operational costs. Table 1 Application Status of Technologies for Producing High-Concentration Water Coal Slurry from Low-Rank Coal Sequence Number Manufacturer Name Coal Slurry Production Capacity (10,000 tons) Location Raw Coal Used Remarks 1 Dongguan Power Fuel Company 500 Dongguan Shenhua coal for water coal slurry; fuel coal slurry 2 Shishi Qingyuan Water Coal Slurry Company 50 Shishi Shenhua coal for water coal slurry; fuel coal slurry 3 Shantou Guiyu Water Coal Slurry Factory 50 Shantou Shenhua coal for water coal slurry; fuel coal slurry 4 Zhejiang Xinyuan Water Coal Slurry Company 400 Tongxiang Primarily Shenhua coal for water coal slurry; fuel coal slurry 5 Jiangsu Shenhua Derui New Energy Company 50 Zhenjiang Shenhua coal for water coal slurry; fuel coal slurry 6 Datang Hulunbuir Fertilizer Co., Ltd. 65 Hulunbuir Lignite (with 12% moisture content); gasification coal slurry 7 Shanxi Fengxi Fertilizer Company 35 Shanxi Primarily Shenfu coal; gasification coal slurry 8 Yuncheng Lunan Fertilizer Plant 100 Zaozhuang Shenfu coal; gasification coal slurry 9 Yuncheng Yulin Energy Chemical Methanol Plant 150 Yulin Yushuwan coal; gasification coal slurry 10 Henan Xinlianxin Fertilizer Company 100 Xinxiang Shenfu coal; gasification coal slurry 11 Inner Mongolia Rongxin Chemical Company 150 Ordos Ordos coal; gasification coal slurry **Water Coal Slurry Engineering Technology Research Center