A closed-circuit adjustment process for calcining needle coke in a rotary kiln and a flue gas treatment system

Abstract

The invention provides a process for closed-circuit adjustment of rotary kiln calcining needle coke and a flue gas treatment system. The coking dry gas is fed into the place; feeding, calcining, and controlling the calcining temperature; the calcined needle coke is cooled by the cooling kiln, and then carried into the calcined warehouse through the bucket, collected and detected; in this system, the flue gas outlet at the end of the rotary kiln It is connected with the ash accumulation chamber, the flue gas outlet of the ash accumulation chamber is connected with the ash settling chamber, the flue gas outlet of the ash settling chamber is connected with the waste heat boiler, and the waste heat boiler is connected with the desulfurization and denitration tower; the kiln head is connected with the cooling kiln, and the smoke from the cooling kiln The gas outlet is connected to the dust removal device, and the flue gas outlet of the dust removal device is connected to the flue gas inlet of the ash accumulation chamber. Using this process to calcine needle coke has the advantages of high yield and uniform particle size after calcination; the system has the advantages of reasonable design, convenient use, less equipment, and can effectively reduce processing costs and avoid air pollution.

Description

technical field [0001] The invention relates to the technical field of needle coke calcination, in particular to a closed-circuit regulating process for calcining needle coke in a rotary kiln and a flue gas treatment system. Background technique [0002] Needle coke is a raw material for the production of high-end carbon products such as ultra-high-power electrodes, special carbon materials, and carbon fibers. With the application of excellent performance, the production volume of needle coke is gradually increasing. Using a rotary kiln to calcine needle coke, the flue gas produced is mainly divided into two processes: one is the flue gas treatment of the rotary kiln, that is, the flue gas preheats the raw materials at the tail of the rotary kiln, and the preheated flue gas is processed The other way is that the flue gas enters the cooling kiln for treatment and then is discharged; in the actual use process, the above treatment process mainly has the following problems: firs...

AI Technical Summary

Problems solved by technology

Using a rotary kiln to calcine needle coke, the flue gas produced is mainly divided into two processes: one is the flue gas treatment of the rotary kiln, that is, the flue gas preheats the raw materials at the tail of the rotary kiln, and the preheated flue gas is processed The other way is that the flue gas enters the cooling kiln for treatment and then is discharged; in the actual use process, the above treatment process mainly has the following problems: first, the two-way flue gas treatment adds a lot of equipment, resulting in high investment costs; second, cooling The flue gas from the kiln is directly discharged into the atmosphere without desulfurization and denitrification, causing air pollution

[0003] Needle coke is mainly used in the preparation of ultra-high-power graphite electrodes. The current market demand is tight. The needle coke calcination processes are mainly rotary kiln and tank furnace processes. However, these calcination processes cannot meet market demand, such as rotary kiln In the calcination process, there are problems such as the low yield of needle coke, such as the yield is generally 70-75%, and the poor particle size of the calcined coke; although the tank furnace calcination process can solve the problem of small particle size after calcination, it still has the problem of processing The quantity is low, such as the processing capacity of a single tank is 75-80kg / h, which cannot keep up with the market demand, and the calcined quality is uneven, such as the difference between the side tank and the middle, the front and the back of the furnace, and the true density is about 0.05-0.1g / cm 3 , poor operating environment and high investment costs, therefore, the new calcination process is of great significance to improve the output and particle size uniformity of needle coke

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