Carbonized tail gas processing system of external heated rotary carbonization furnace and application method thereof

Abstract

The invention relates to a carbonized tail gas processing system of an external heated rotary carbonization furnace. The system comprises a tail gas washing tower, a tail gas heat exchanger, an electric tar catcher, a cooler, and a settling basin. One side of the tail gas washing tower is provided with a driving water supply pipeline, a pipeline I, a washing water pipeline, and a drying carbonized tail gas pipeline, the other side is connected with the cooler, the top is connected with the tail gas heat exchanger, and the bottom is connected with a pipeline V; the cooler is connected with a cooling circulation water return pipeline I, and a cooling circulation water feeding pipeline; the top of the tail gas heat exchanger is connected with a cooling circulation water return pipeline II, the bottom is connected with the cooling circulation water feeding pipeline, and one side is provided with pipelines VII and VIII; the pipeline VII is connected with the electric tar catcher, the electric tar catcher is connected with a blowing nitrogen pipeline, a pipeline IX, and a crude gas pipeline; the pipelines IX is connected with the pipeline VIII and the settling basin, the settling basin is provided with pipelines XI and XII, a tar pipeline, and a coal slurry pipeline; and the pipeline XII is connected with the pipeline I. In addition, the invention discloses an application method for the system. The system and the method are capable of effectively improving the utilization efficiency.

Description

technical field [0001] The invention relates to the technical field of activated carbon production, in particular to an external heating type rotary carbonization furnace carbonization tail gas treatment system and an application method thereof. Background technique [0002] In the process of industrialized production of activated carbon, raw coal as a raw material must first go through the process of oxidation and carbonization, and then be further activated, so as to obtain activated carbon with practical application value. The carbonization treatment of raw coal generally adopts the process of roasting in an external heating rotary carbonization furnace, and the carbonization temperature is about 400~550°C. Under this condition, the raw coal will undergo severe physical and chemical changes, and some H 2 , CO, organic volatile matter, tar, etc. will be precipitated during the carbonization process. The temperature of the carbonization tail gas is about 200~300 °C, and its...

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Problems solved by technology

[0003] ⑴In industrial production, the height of the incinerator is generally higher, and the carbonization tail gas pipeline between the carbonization furnace and the incinerator is longer. Due to the high boiling point of tar, it is easy to condense into liquid, and the tail gas contains some coal powder. Therefore, the tail gas pipeline is prone to blockage, which brings great inconvenience to the entire industrial production.

[0004] (2) The components contained in carbonization tail gas are relatively complex, including combustible gas components and solid particles. The two different forms of components have completely different combustion mechanisms, which causes great difficulties in the design of incinerators. The gas components can be completely burned in the incinerator, but the pulverized coal in the tail gas can only be partially burned, and the remaining part of the pulverized coal will enter the subsequent waste heat boiler system along with the high-temperature flue gas. Long-term operation will cause waste heat in the waste heat boiler The accumulation of pulverized coal on the heat exchange tubes greatly reduces the heat exchange efficiency of the waste heat boiler

[0005] (3) Carbonization tail gas often contains a small amount of SO 2 , SO 3 Such as sulfur-containing substances, the temperature of high-temperature flue gas decreases after heat exchange in the waste heat boiler. When the working conditions change, the temperature of the flue gas after heat exchange may be lower than the sulfur dew point, resulting in water vapor and sulfur-containing substances in the flue gas. Condensation on the heat exchange tubes, causing corrosion of the heat exchange tubes

[0006] ⑷In the actual industrial production process of activated carbon, part of the steam generated by the waste heat boiler is used for the activation process of activated carbon, part is used for heat tracing and heat preservation of the whole plant, and the other part is used for power generation. Due to the low temperature of the steam, the power generation efficiency is not high. High, the waste of energy is serious

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