Xinjiang Yihua circulating fluidized bed oxygen-rich oxidation furnace was successfully ignited

China Daily, May 18 (Reporter Zhang Zhihao) On May 18, my country's first atmospheric pressure circulating fluidized bed gasifier used in the field of synthetic ammonia was successfully ignited at Guizhou Hongsheng Chemical Co., Ltd. and entered the hot debugging and operation stage. This gasifier is also my country's first circulating fluidized bed gasification device using anthracite as raw material. The gasifier adopts circulating fluidized bed coal gasification technology (CGAS technology) developed by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, and is contracted by the EPC General Contractor of Hefei Coal Gasification Co., Ltd. ； It is the first phase of the upgrading project of the gas production section of the 300,000-ton synthetic ammonia system of Guizhou Hongsheng Chemical Co., Ltd. The company's original annual production capacity of synthetic ammonia was 150,000 tons. It used an intermittent fixed-bed gasifier to produce syngas. The production process was high in energy consumption, heavy in pollution, and low in efficiency. In order to solve this problem that plagues the development of the enterprise, after technical feasibility demonstration, the company decided to replace the original fixed bed gas furnace with a large atmospheric pressure circulating fluidized bed gasifier, and complete the transformation of the synthetic ammonia gas source in two phases.

In order to solve this problem that plagues the development of the enterprise, after technical feasibility demonstration, the company decided to replace the original fixed bed gas furnace with a large atmospheric pressure circulating fluidized bed gasifier, and complete the transformation of the synthetic ammonia gas source in two phases. In the first phase of the project, a new 60,000 Nm3/h atmospheric-pressure circulating fluidized bed oxygen-enriched gasifier was built, replacing the original 24 intermittent fixed-bed gasifiers with carbonized briquettes. It not only eliminates dust emissions from briquette preparation and phenolic wastewater emissions from fixed-bed gasifiers, and tar pollution, but also uses local powdered anthracite as raw material, saving a lot of coal costs for the company. After the transformation is completed, the company's cost per ton of ammonia will be significantly reduced. The first phase of the project alone can save the company more than 66 million yuan in operating costs every year. After the second phase of the project is completed, the company's total production capacity will be expanded to 300,000 tons/year, achieving comprehensive technological transformation and upgrading, energy conservation and consumption reduction.

The gasifier uses local powdered anthracite coal from Guizhou as raw material. The coal quality is characterized by low activity and high ash content. It is difficult to fully gasify using entrained bed gasification technology and bubbling fluidized bed gasification technology. With the support of the "Industrialization of Circulating Fluidized Bed Coal Gasification Technology" project of the Chinese Academy of Sciences' Scientific and Technological Achievements Transfer and Transformation (Hongguang Special Project), the technology research and development unit, the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, has built a high-rate circulation loop to significantly increase the carbon concentration in the gasifier furnace and strengthen the gasification reaction. It has broken through the technical bottleneck of low-activity, high-ash powdery anthracite gasification and provided an economically feasible solution for the clean and efficient conversion and utilization of this type of coal. Zhongke Hefei Coal Gasification Technology Co., Ltd., a professional coal gasification industrialization company established with technology investment from the institute, has transformed the technology into products with high standards based on its rich engineering experience in circulating fluidized bed coal gasification to produce industrial gas technology. ； It also overcame many unfavorable conditions such as the tight project schedule, complex geological conditions, humid construction environment, and the impact of the epidemic, and pushed the project forward as scheduled.

At present, the production capacity of my country's small and medium-sized ammonia plants is about 30 million tons per year, which still accounts for more than half of my country's total ammonia production capacity. Most of their gas production processes use intermittent fixed-bed gas generators. There are about 3,000 units in operation across the country. There are common problems such as high energy consumption and heavy pollution. many places * * Policies have been introduced to expedite the elimination of a number of fixed-bed intermittent coal gasifiers in the fertilizer industry. The transformation and upgrading of technology has become an urgent need for small and medium-sized synthetic ammonia companies to survive and develop. However, entrained bed gasification technology generally requires high investment and large scale, which is difficult to match the actual needs of small and medium-sized ammonia synthesis companies. CGAS technical equipment is compatible with the original process equipment of small and medium-sized ammonia synthesis, with low initial investment. It is especially suitable for the transformation and upgrading of small and medium-sized ammonia synthesis enterprises. Therefore, this project will provide economical and applicable solutions for the technological transformation and upgrading of small and medium-sized ammonia enterprises, and will help improve the environmental protection level of my country's synthetic ammonia field.

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“This device is the most advanced new coal gasification process in the country's industry adapted to the coal quality of Zhundong Development Zone. At the same time, to produce ammonia and urea, coal gas production is the first step and the leader of the entire process. ”Yang Xiaoqin said that the circulating fluidized bed oxygen-enriched gasification furnace equipment uses coal as raw material, steam and oxygen as gasification agents, and undergoes high-temperature continuous oxygen-enrichment to produce semi-water gas. As the raw material gas for the post-process, it undergoes compression, transformation, low-temperature methanol washing, desulfurization and decarbonization, acid gas sulfur recovery, alcohol hydrocarbonization and refinement, and then ammonia synthesis to obtain the intermediate product liquid ammonia, and then the ammonia reacts with carbon dioxide to produce the final product urea granules. Through some ingenious processing, the equipment has solved the special problems of Zhundong sub-bituminous coal such as high sodium and potassium, high moisture, low ash content, low ash melting point, oil content, special viscosity-temperature characteristics, and poor slurry-forming properties, making it the most suitable choice for large-scale new coal gasification using Zhundong sub-bituminous coal as raw material.