Research On The Catalytic Pyeolysis Of Waste Tire Using Waste Heat Of Blast-furnace Slag

How to achieve waste tire environment and efficient recycling has become the world's attention,at the same time,how to achieve the efficient recycling of metallurgical slag waste heat has become an important research area of steel production.In this paper,a new idea of the co-production of waste tires by using blast furnace slag waste heat is proposed.The high-temperature slag particles prepared by dry granulation of liquid blast furnace slag are used as heat carrier through direct contact heat transfer of tire powder to realize particle Between the efficient heat transfer.The effect of the powder particles in the slag heat carrier is rapidly warming up to achieve oil and gas co-production.The use of blast furnace slag waste heat as a tire pyrolysis heat source to waste treatment waste,both to achieve the waste tire recycling and reduction of treatment,but also to achieve the efficient recovery of blast furnace slag waste heat and use.In addition,due to the direct contact with the heating method,can significantly promote the tire cracking process of heat transfer efficiency,improve the high valueadded products-pyrolysis oil product quality and yield.In this paper,the influence factors such as cracking temperature,blast furnace slag and powder equivalent ratio,particle size and high particle size were investigated by the laboratory scale powder catalytic cracking experiment,which was influenced by the catalytic cracking of tire powder with blast furnace slag as heat carrier The slag particle size was studied systematically.The catalytic performance of blast furnace slag in the promotion of rubber powder cracking was analyzed and evaluated.The physical and chemical properties of the products were analyzed and tested to improve the efficiency of cracking and oil and gas Condition parameters.It was found that the thermogravimetric analysis showed that when the reaction temperature was higher than 460 ?,the cracking reaction of the powder was finished.With the increase of the reaction temperature,the yield of the cracked oil increased first and then decreased,and at 550 ? The oil reaches its maximum.The slag is mixed with the powder particles,the higher the proportion of slag,the better the heat transfer effect between the particles,the cleavage reaction in the same solid phase residence time,the higher the yield of pyrolysis oil,The lower the yield of black.Reducing the particle size of the powder can improve the gas yield in the lysate,but it can cause the decrease of the yield of pyrolysis oil and carbon black.The smaller the particle size of the blast furnace slag as a heat carrier,it contributes to the uniform heating of the powder and promotes the thermal cracking reaction of the powder and increases the yield of the cracked oil and gas.Blast furnace slag has a certain catalytic effect on the cracking of tire powder,which is beneficial to the formation of non-condensable gas,but the effect of improving the yield of cracked oil is not obvious.At the cracking temperature of 550 ?,the mass ratio of blast furnace slag and rubber powder is 2: 1,the particle size of powder is less than that of blast furnace slag,and the yield of pyrolysis oil is the largest.By analyzing the physical and chemical properties of the cracked oil,it was found that 44% of the total C of the waste tire raw material existed in the pyrolysis oil,and about 61.1% of the H existed in the pyrolysis oil,and about 41.8% of the S was present in the pyrolysis oil,Which is the waste tire pyrolysis oil S content is higher than the general crude oil reasons.In this paper,a set of pilot-scale tire cracking apparatus with blast furnace slag as heat carrier was developed,and a pilot test was carried out in the blast furnace production site of a steel mill in Qingdao.The field analysis of the blast furnace slag was carried out.The energy recovery rate was 15.96%,the energy recovery rate was 55.94%,and the energy consumption ratio was 3.14,which was based on the waste heat recovery of metallurgical slag.The results showed that the catalytic cracking system based on metallurgical slag waste heat recovery was 15.56% Of the catalytic cracking technology and equipment research and development to provide data support and theoretical support.