Rationally develop Yunnan to build brown coal industry cluster

Yunnan is the second largest brown coal producing area in China, with reserves of more than 17 billion tons of brown coal. However, due to the characteristics of high moisture content, low calorific value, high volatile content, and poor thermal stability of lignite, deep processing industrialization technology has not yet achieved a breakthrough, resulting in a low degree of development and utilization. Combining the characteristics of brown coal resources in the province and the current state of development of the energy industry, from the perspective of building the Yunnan lignite industry chain and industrial clusters, the Yunnan Science and Technology Department has organized a multi-joint coal chemical industry strategic innovation alliance to start the implementation of the “efficient conversion of Yunnan brown coal”. “Resource utilization engineering technology development demonstration” major science and technology project, total investment of 445.27 million yuan, provincial science and technology special funds support 16 million yuan, set up six topics, carry out research and demonstration of lignite comprehensive utilization industrialization technology, and overcome the comprehensive utilization of lignite Key technologies to solve the major bottleneck problem of lignite utilization.

1. Developing advanced technologies for lignite gasification to increase comprehensive utilization of lignite resources LNG coal gasification and conversion is one of the main methods used in the development and utilization of lignite in China. Increasing the efficiency of lignite gasification and conversion is the most important in the technical route of lignite gasification conversion. problem.

The project of “Key technology and equipment development for fixed bed slag gasification and demonstration of equipment” was implemented to study and develop large-scale fixed-bed crushing liquid slagging brown coal gasifier technology, and to build 1200 tons of crushing coal slag pressurized gas for daily treatment of lignite. The demonstration project can directly evaporate coal with moisture below 40%; efficiently convert coal resources on site to clean fuel product gas, the content of combustible gas in the product gas reaches 80%, the efficiency of cold gas reaches 85%, liquid slag discharge The residual carbon content of ash residue is ≤0.2% for deep processing of follow-up products; in China, a new process of carbon dioxide as a coal lock press and multiple gasifiers are charged.

The project "Methanol Syngas LNG and CNG Process Technology Development and Engineering Demonstration" was carried out to study the crude gas obtained from the pulverized coal pressurized gasification technology and to study the purification gas developed after the low-temperature methanol scrubbing. , Separation coupling technology, twin-column coupling process technology and low-temperature twin-column coupling device, built an annual LNG and CNG demonstration project that deals with 1.487 billion standard cubic meters of purified gas and 200 million standard cubic meters per year (reduced gas).

Second, research and development of lignite direct liquefaction technology to increase the conversion rate of lignite resources Direct liquefaction is an important new direction for the development of high-efficiency and low-rank lignite conversion and resource utilization, and supercritical water direct liquefaction technology is currently the most used lignite utilization. One of the cutting-edge technologies. The Yunnan lignite represented by Zhaotong is a high-moist, low-rank lignite with a moisture content of more than 40% and a caloric value of less than 2000 kcal/kg. Development and utilization of it has always been a problem that has plagued China.

The key project of “Key Technology for Direct Liquefaction of Supercritical Water with High Humidity and Low-rank lignite” was implemented, and through key technologies, the pilot project “The direct liquefaction of high-moisture low-rank lignite with supercritical water in Yunnan” was completed with a pilot production line of 2 tons per day. The industrial installation process software package with a coal-fired amount of 100 tons per day was formed; the core technologies and key technologies in the field were formed with independent intellectual property rights and a complete technical system, and the overall technology reached the international leading level; and the carbon conversion rate was greater than 80%. The coal utilization rate is more than 85%, the total energy efficiency is more than 65%, and the added value of lignite is increased to more than 5 times of the raw coal.

Third, research and development of lignite into oil products technology, provide demonstration for the use of resources to industrialization China's energy structure is characterized by rich coal, low gas, lack of oil, from the perspective of energy security strategy, the development of oil alternative energy demand is urgent.

The "One-step Synthesis of Crude Gasoline by Methanol, Crude Gasoline Purification, Key Technology Development and Demonstration of Heavy Aromatic Hydrocarbon Extraction" was implemented, and a one-step process for the conversion of naphtha into methanol, a one-step synthesis reactor for methanol synthesis of naphtha, was developed. Synthetic crude gasoline refining and heavy aromatics fine chemical extraction technology, construction of a synthetic naphtha demonstration unit with a single reactor capable of handling 250,000 tons of methanol per year, construction of a demonstration unit with annual refining gasoline of 168,000 tons and an annual output of 1.3 Million tons of mesitylene production facilities. At the same time, the next step in the role of methanol in the molecular sieve catalyst conversion to produce clean oil products, after refining in addition to the main product of gasoline also get liquefied petroleum gas (LPG) and heavy fuel oil two * high-quality clean fuel. With continuous distillation and large-scale rectification-crystallization coupling technology, the content of mesitylene extracted from heavy fuel oil reaches 99%.

Fourth, research and development of key technologies for gas water, and improvement of utilization of gas water resources for recycling Gas water (ie, "coal gasification waste water") is produced in the coal gasification production process due to cooling, washing, purification, and other technological processes. The composition is very complicated, and the amount of water is large. As an organic wastewater that is difficult to biodegrade, it has become a difficult problem to be solved in water treatment.

Implemented the project of "Key gas resource recovery and treatment key technology development and engineering demonstration". Through research on the recovery and utilization of ammonia and phenolic substances in gas water, and key technology development and engineering demonstration of crude phenol finishing equipment, the gas and water Reuse after treatment to achieve near-zero emissions, energy saving and emission reduction, reduce equipment operating costs, operation and management costs, etc., improve the quality of recycled products and the recovery of utilization of gas water resources.

V. Developing clean coal technology and promoting the diversification of the energy industry Strategic development The development of clean coal technology is one of the strategies for implementing the national energy diversification strategy. Among them, the coal cryogenic retorting technology method is relatively simple, has less investment, and is highly competitive.

Implementation of the “Research and Engineering Demonstration on Low-Temperature Rapid Drying Technology of Lime Gas-Supported Thermal Fluidized Bed”. Developed rapid gasification technology and equipment for the hot-fluidized bed of brown gas, and obtained high-quality semi-coke, tar, and gas; The pilot pilot production line for processing 50,000 tons of lignite was initially formed, and a large-scale equipment package with independent intellectual property rights was initially formed to fully realize the lignite step conversion.

According to the major science and technology project of Yunnan Lignite High-Efficiency Transformation and Resource Utilization Engineering Technology Development and Demonstration Project and the implementation targets of the above six sub-projects, 10 domestic largest industrial demonstration production lines and pilot production lines such as lignite gasification facilities will be completed by the end of 2014. The annual processing capacity of brown coal is over 500,000 tons. The overall technological level of the industry will reach the international advanced level and the domestic leading level. The research and development of the large-scale petrol reactor for methanol conversion and the separation and purification crystallizer of mesitylene will fill domestic gaps; After the delivery, the annual sales income will reach 2.484 billion yuan and the total profit will be 300 million yuan. The implementation of this major science and technology project will realize the in-depth development of lignite and the efficient use of cascades, vigorously promote the leap-forward development of the lignite industry in Yunnan Province, and turn Yunnan into a province with a large coal-producing province and a large coal-producing province.