Contrastive analysis of exergy in carbon black process of plasma method and furnace method

doi:10.11949/j.issn.0438-1157.20171694

Abstract

Abstract:

Traditional process of carbon black (CB) by furnace method suffers from some shortcomings such as low energy efficiency, amount of CO₂ and NO_x emissions, and low yield of carbon. The plasma method instead of furnace CB could improve energy efficiency greatly, and eliminate CO₂ and NO_x emissions produced by combustion, and the ideal conversion rate of carbon could reach 100%. This paper aims at analysis energy efficiency by the plasma method comparing to that by the furnace method for producing CB. The processes of two methods were simulated based on Aspen Plus software. The process exergy rates of furnace CB were calculated for five kinds of CB (N110, N220, N330, N440 and N550) respectively, and two feedstocks of methane and tar were calculated in plasma method. The contrastive analysis of the processes of two methods was made, including the yield of carbon, the exergy rate of input and output materials, the exergy efficiency of product and process. The results indicate that the carbon yield of the furnace method is between 47.6%-66.6%, which is significantly lower than 94% ideal carbon yield of the plasma method. The exergy efficiency of product and process of the plasma CB are higher than that of furnace CB when tar is used as a feedstock. The exergy efficiency of product using tar as a feedstock is higher than that using methane as a feedstock in plasma CB process.

Key words: plasma carbon black, furnace carbon black, chemical processes, exergy, numerical simulation

摘要：

传统炭黑生产过程热能效率低，存在大量NO_x和CO₂排放，炭黑收率低。等离子体法生产炭黑能大幅提高能量利用效率，理想状况下可以完全收获原料中的碳，并消除由于燃烧产生的CO₂和NO_x排放。基于Aspen Plus软件模拟了炉法炭黑和等离子体法炭黑工艺过程。计算分析了等离子体法炭黑工艺相对于炉法炭黑工艺的节能效果：对于炉法炭黑分别计算了N110、N₂20、N330、N440和N550五种炭黑品种的过程(火用)流，等离子体法炭黑计算了甲烷和焦油两种原料的过程(火用)流；对比分析了两种工艺过程炭黑收率、进出料(火用)流、产品(火用)效率以及工艺过程(火用)效率。结果表明：以焦油为原料的炉法炭黑收率在47.6%～66.6%之间，与实际值吻合，明显低于等离子体法94%的理想炭黑收率；以焦油为原料的理论计算表明，等离子体法炭黑产品(火用)效率和工艺过程(火用)效率显著高于炉法炭黑；以焦油为原料的等离子体法炭黑产品(火用)效率高于以甲烷为原料的产品(火用)效率。

关键词: 等离子体法炭黑, 炉法炭黑, 化学过程, (火用), 数值模拟

CLC Number:

TQ127.1⁺1

CUI Haichao, CHEN Xianhui, WANG Cheng, XIA Weidong. Contrastive analysis of exergy in carbon black process of plasma method and furnace method[J]. CIESC Journal, 2018, 69(7): 2815-2821.

崔海超, 陈仙辉, 王城, 夏维东. 等离子体法炭黑工艺与炉法炭黑工艺的(火用)对比分析[J]. 化工学报, 2018, 69(7): 2815-2821.

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