Dust and flue gas processing method in carbon product kneading and compacting procedure

Abstract

The invention relates to a processing method for collecting dusty gas in carbon products kneading molding process. The invention is characterized by processing procedures which are as follows: after carbonaceous dust and asphalt fume are collected, which are formed in the process of asphalt melting, kneading, pasting, molding and cooling; the formed carbonaceous dust and the formed asphalt fume are collectedly sent to an air inlet of a calciner or a rotary kiln to serve as air distribution of the refinery coke calciner or the rotary kiln, and then are led into the calciner or the rotary kiln to perform full combustion in the temperature of between 1150 to 1350DEG C in the calciner or the rotary kiln; through combustion, organic substances in flue gases of the asphalt are decomposed and hazard of the gases can be consequently eliminated. The processing method for collecting dusty gas in carbon product kneading molding process has the advantages of simple process, reliable technology and low operating cost, and can effectively and completely process the flue gas of the asphalt and eliminate secondary pollution; at the same time, the processing method can fully utilizes the heat formed through combustion of the fuel gas to save fuel or provide more afterheat and reduce production cost of the carbon products, thus the processing method has great economic benefit and environment protection benefit.

Description

A treatment method for dust collection and flue gas in the kneading and molding process of carbon products technical field The invention relates to a treatment method for dust collection and flue gas in the kneading and forming process of carbon products. Background technique At present, the raw materials used in the production process of carbon products factory are mainly petroleum coke and coal tar pitch. In the manufacturing process of carbon products, it mainly completes the processes of secondary crushing and screening, asphalt melting, batching, kneading, molding, and paste cooling. The kneading and molding section emits a large amount of harmful fumes, the main components of which are carbon dust and asphalt fumes. The harmful chemical substance 3,4-benzopyrene contained in asphalt smoke and dust is a carcinogen, and its emission seriously endangers health. Generally speaking, the flue gas containing only coke dust and particles can be effectively treated by bag d...

AI Technical Summary

Problems solved by technology

Once the temperature fluctuates, it will affect the treatment effect

②The carbon powder adsorption method consumes a large amount of carbon powder, the process is complicated, the replacement and treatment of the adsorbent is difficult, and the use of the adsorbent has an impact on the quality of the anode

③The asphalt fume containing carbon powder generated during the kneading process can also be treated with a bag filter. The problem is that after the asphalt fume solidifies and the carbon powder particles are easy to adhere to the surface of the dust bag, it is difficult to clean and block Dust bag, and affected by temperature

This method has some shortcomings: complex process, large investment and high energy consumption; the carbon powder adsorbed by asphalt fume is returned to use, which affects the accuracy of the formula; the final exhaust gas also contains part of dust and asphalt fume

However, during the manufacturing process of raw anodes, the asphalt fume discharged under the melting condition of asphalt is collected by dust collection pipes and has a low concentration (about 100-500mg / Nm3), so it cannot be directly burned

Although some large-scale carbon plants and new carbon plants have built flue gas treatment and purification devices, due to high equipment operating costs, poor reliability of long-term system operation, and high difficulty in system maintenance, these purification systems have poor operating effects and abnormal operation. It is commonplace, and the governance effect is difficult to maintain for a long time