“At the end of this month, the Shanghai Waigaoqiao Lignite Drying and Quality Improvement Demonstration Project, which was developed in cooperation with China Power Investment Group, will be hot-linked and the annual production will reach 150,000 tons, which indicates that China’s large-scale application of clean coal technology has been achieved. Substantive breakthrough.” On the 13th, when the Economic Herald reporter was interviewed by Shandong Tianli Drying Co., Ltd., a holding company of the Shandong Academy of Sciences (hereinafter referred to as “Tianli Company”), Dr. Li Sheng, the company’s deputy general manager, disclosed that Tianli’s Currently, it not only provides technology and products to China Power Investment Group and China Power Engineering Consulting Group, but also cooperates with Shandong Energy Group and plans to build a lignite drying and quality upgrading project with an annual output of 3 million tons in Inner Mongolia. In the context of China’s strategy of using coal as its main energy source, the Chinese government promised to reduce its CO2 emissions per unit of GDP by 40% to 45% in 2005 compared with 2005. At present, high-quality coal resources such as bituminous coal and anthracite coal have been fully utilized in China, and there is limited space for expansion. The large-scale development and utilization of lignite has only just begun. However, the lignite in China has the disadvantages of low ignition point and large amount of carbon dioxide emissions due to high humidity, which restricts the promotion and utilization of lignite. Tianli's original superheated steam low-quality coal drying upgrading technology and equipment with independent intellectual property rights have outstanding advantages in environmental protection, safety, energy saving and water saving compared with other lignite upgrading technologies. Once large-scale application will produce huge The economic and social benefits. "Steam Drying" instead of "Flue Drying"

In the pilot base of the Shandong Provincial Academy of Sciences located at Jingshi East Road in Jinan City, a huge machine with several floors was erected. Jiang Bin, manager of Tianli’s business, told the reporter that this was the company’s newly developed superheated steam. Low-quality coal drying experimental device.

“It is in this large machine that a series of reasonable drying processes can effectively reduce the water content of lignite and increase the energy density of lignite, and ultimately achieve the purpose of improving quality and energy saving.” Jiang Bin said that at present, domestic lignite power plants use high temperatures. The flue gas passes through the coal mill to achieve the purpose of drying the coal powder. However, the direct contact between high-temperature flue gas and pulverized coal has potential safety hazards, resulting in a decrease in furnace temperature and boiler efficiency, and the excessively high lignite moisture leads to complex adjustment, high power consumption and maintenance costs. Domestic lignite coal mining companies use pre-drying technology to improve quality. Most of them also use rotary drum dryers, air dryers, and chain-plate dryers that directly contact coal-fired flue gas. The single-processing capacity is small, the land occupation is large, and investment is high. , Pollution, does not meet the requirements of China's energy-saving emission reduction.

Superheated steam drying technology has enabled China's clean coal technology to achieve new breakthroughs. It utilizes the process innovation of using superheated steam as a drying medium, combined with exhaust gas waste heat recovery technology. Compared with other upgrading technologies, it has the outstanding advantages of environmental protection, safety, energy saving over 80%, and water saving. The production strength is higher than Germany's famous energy. Enterprise RWE technology. Appraised by the Shandong Provincial Department of Science and Technology, it has reached the international advanced level and has obtained more than 10 national patents. This environment-friendly and resource-saving clean coal technology project is applied to domestic lignite power plants, coal mines, and coal chemical projects. Through the technical transformation and upgrading of the lignite pretreatment process, fuel consumption can be significantly reduced by 5% or so and it is about 15%. The CO2 emission will reduce the loss of supporting systems, increase the overall efficiency of power plants and coal chemical systems, and provide financial support for the CDM (United Nations GHG emission reduction project). Taking the thermal coal accounting for about 90% of the brown coal output as a measure, through the dehydration and upgrading of the raw coal, China can reduce carbon dioxide emissions by about 15 million tons per year, strive for CDM support of nearly 800 million yuan, save 40 million tons of standard coal, and economic efficiency and society. The benefits are very significant. The use of lignite has unlimited potential. "The coal we usually use is bituminous coal and anthracite. Although there is less moisture and higher calorific value, due to the earlier development, the current resources are rapidly decreasing. There are few coal mines in our province. In this case, the effective utilization of lignite has shown great potential." Li Sheng said that China's lignite resources are relatively abundant, and its proven reserves account for 13% of the country's coal reserves, of which Inner Mongolia accounts for 77% of the country's total lignite reserves. And the mining cost is low, and the market price per ton is only about 1/3 to 1/4 of bituminous coal and anthracite. In recent years, the installed capacity of China's lignite power generation has developed at a geometric progression almost every year. Many power plants in our province are also adding brown coal to generate electricity. However, compared with bituminous coal and anthracite, China's lignite has the disadvantages of low ignition point and large amount of carbon dioxide emissions due to high humidity (30% to 50%). Direct burning of unmodified brown coal raw coal will produce serious high The problem of environmental pollution (carbon dioxide emissions is about 15% higher than that of ordinary bituminous coal) increases the construction and operating costs of power plants and coal chemical projects; at the same time, the higher water content and the vulnerability to spontaneous combustion also lead to increased lignite transport costs and difficulties in storage. It limits the space for the lending and utilization of abundant lignite resources in Inner Mongolia. In Tianli’s energy-saving engineering laboratory, the Herald reporter saw that there are dozens of large and small dryers and other equipment, and the brand name “Shanghai Electric Power Brown Coal Quality Improvement Industrial Demonstration Base” at the entrance of the laboratory is very eye-catching. According to reports, it is precisely to see the huge potential of lignite utilization and the use of its original technological advantages. Tianli Company started to develop clean coal technology for the use of lignite as early as 1999; in 2004, it developed a process for drying fluidized bed of superheated steam. , And successfully applied to the soda industry; after more than 10 years of continuous research and development, the company finally successfully launched superheated steam clean coal technology, and completed industrial validation experiments. At present, the technology is entering a stage of large-scale promotion and application, and huge business opportunities are blowing. As expert of the Expert Group on Drying Experts of the Engineering Committee of the China Chemical Engineering Society, Li Sheng believes that for the rapid growth of the proportion of brown coal power generation in China, the development trend of West-to-East power transmission and the increase in the input of high-efficiency and environment-friendly units, promotion of superheated steam and low-quality coal drying and upgrading A clean coal new technology meets the requirements of China's sustainable development strategy and energy conservation and emission reduction. Not only will it have a huge driving effect on the energy conservation and emission reduction of coal and power industries in China, but it will also play an important role in promoting the upgrading of green technologies in China's coal and power energy infrastructure industries. International advanced and even international leading level, realize leapfrog development.

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