Factors affecting the thermal strength of coke
Thread Content
Sir, may I ask what aspects should be considered in order to effectively control the thermal strength of coke? What factors influence the thermal strength of coke?
At present, the heat strength cannot be determined; what is mainly measured is the cold strength.
Since the cold strength of coke is related to the pore size and distribution of its pores, its high-temperature strength CSR is closely associated with the thickness of the coke pore walls. Therefore, coke has high cold strength, but its high-temperature strength is not necessarily good.
Mainly in line with the composition of the coal, and based on the requirements regarding thermal intensity, more coking coal and fat coal are used, while 1/3 less coking coal is utilized.
The factors affecting coke strength generally include raw coal characteristics and process conditions. Raw coal plays a decisive role, being closely related to the type of coal used. Process conditions include the bulk density of the raw coal, particle size distribution, moisture content, and the final temperature at which coking occurs
Could you explain in detail which factors are related to both CSR and CRI? Factors such as the properties of individual coal types and coking temperatures, for example. How can these indicators be improved?
The thermal strength of coke mainly depends on the quality of coal: 1. The volatile matter content in the blended coal should not be too high, generally kept between 25 and 28. 2. The ash content of the blended coal. 3. The uniformity of temperature control during coking. It is also related to the coking time, especially the holding time at the end of the coking process.
Agree with the opinion above; additionally, attention should be paid to the inherent properties of individual coal types
The indicator of coke thermal strength is receiving increasing attention in blast furnace ironmaking, which undoubtedly increases the pressure on coke production. Improving coke quality is the main task in coking, but some ironmaking plants attribute any production problems to poor coke quality. This is difficult to accept
Optimal coal blending range: Vdaf=28-32%, bonding index 58-72.
The current methods for testing heat intensity do not adequately reflect the behavior of coke in blast furnaces; there is a strong call for **the relevant authorities to revise the testing standards**