University of Science and Technology Beijing

Soochow University

Beijing Kemi Rongcheng Energy Technology Co., Ltd.

Shaoyan Hu

Rong Zhu

Kai Dong

Guangsheng Wei

Chao Feng

Weifeng Li

Rongfang Su

Wenhe Wu

Xueliang Wang

Yun Zhou

Baochen Han

Chunyang Wang

Yun Bj Wang

Zhihui Li

Juanjuan Jiang

Tianping Tang

Xuetao Wu

Jingxin Zhao

Haoran Ma

Jianfeng Dong

Dong Hou

Jun Tian

Tianpeng Qu

Deyong Wang

Shizhan Sheng

Yingjun Xu

Huihua Wang

Xin Ren

Zhitao Xue

Linghui Meng

A converter bottom blowing system comprises a first gas source connected in parallel with a lime powder silo, a lime powder blowing tank and a first injector, where a first cut-off valve is arranged between the lime powder blowing tank and the first injector; a second gas source connected in parallel with the biochar powder silo, the biochar powder blowing tank and the second injector, where a second cut-off valve is arranged between the biochar powder blowing tank and the second injector; a converter, where a plurality of bottom blowing lances are arrayed at a bottom of a converter, the bottom blowing lances are connected with the first injector and the second injector through a three-way valve, a third cut-off valve is arranged between the first injector and the three-way valve, and a fourth cut-off valve is arranged between the second injector and the three-way valve.

Converter bottom blowing system capable of allowing multiple media to share bottom blowing lances and method for using same

The present invention provides an in-situ method for synthesizing a Ni&#x2014;W&#x2014;WC composite coating, which includes the following steps: immersing a carbon steel substrate to be coated in an electroplating solution and electroplating, to obtain a Ni&#x2014;W&#x2014;C alloy coating on the surface of the carbon steel substrate; and then subjecting the alloy coating to high temperature heat treatment to obtain the Ni&#x2014;W&#x2014;WC composite coating. The electroplating solution comprises the following components: a nickel salt, a tungstate, citric acid, a citrate, a recarburizer, and a wetting agent. The present invention shows merits of simple operation, high current efficiency, simple electroplating process, and is clean and causes no pollution, thus meeting the requirements of environment protection.

In-situ method for synthesizing Ni&#x2014;w&#x2014;Wc composite coating

The present disclosure provides a converter CO&#x2014;Omixed injection smelting method and a fire point area temperature dynamic control method. The method realizes online monitoring through an infrared temperature sensor installed inside an oxygen lance, dynamically adjusts the mixing ratio of COand Oand the height of the oxygen lance position according to the fire point area temperature changes and process requirements in different smelting stages, so that the secondary smelting system interlockingly and dynamically controls the fire point area temperature and the molten pool heating rate.

Converter CO2&#x2014;O2 mixed injection smelting method and method of dynamically controlling fire point area temperature

A long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick belongs to the field of steelmaking technologies using powder-bottom-injecting converters. According to equipment characteristics, process characteristics, and erosion characteristics of the powder-bottom-injecting converter, the design, arrangement, installation, use, maintenance, and replacement of the bottom purging/powder injection bricks are systematically optimized and improved, a technology of automatically detecting the erosion height of bottom purging bricks is adopted, and hot replacement of bottom purging/powder injection bricks and hot replacement of the converter furnace bottom are used collaboratively, which not only can prolong the service life of a single bottom purging/powder injection brick, but also can greatly prolong the overall life of the powder-bottom-injecting converter from 1000-3000 heats in the prior art to 6000-10000 heats. Hence, the life of the powder-bottom-injecting converter is as long as that of a conventional converter.

Long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick

An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO&#x2014;Nmixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO&#x2014;Nmixed gas through the decarburization converter flue gas; obtaining O&#x2014;CO&#x2014;Nmixed gas through the decarburization converter flue gas; obtaining first-purity COgas through the second-purity CO&#x2014;Nmixed gas; and using the first-purity CO&#x2014;Nmixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO&#x2014;Nmixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O&#x2014;CO&#x2014;Nmixed gas and the first-purity COgas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.

Efficient long-service-life blowing method and system for vanadium extraction-decarburization duplex converters

A clean and rapid smelting method in an electric arc furnace with full scrap steel, is suitable for smelting process of 30-300 t electric arc furnace with full scrap steel. In the smelting process of the electric arc furnace with full scrap steel, different kinds of mediums are injected by an injection lance which is installed inside refractory material of sidewall at the bottom of the electric arc furnace in different stages of smelting. Carburization is utilized in molten pool to accelerate melting down and improve carbon content of the molten pool at the stage of recarburizing and fluxing. A reaction in the molten pool is intensified at the stage of high efficiency dephosphorization and deep denitrogenation, to enhance efficient dephosphorization and deep denitrification of the reaction in the molten pool, thereby accelerating the smelting speed of the electric arc furnace with full scrap steel, improving effect of dephosphorization and denitrification.

Clean and rapid smelting method in an electric arc furnace with full scrap steel

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Beijing, China

Shaoyan Hu