Screening and drying method for wood chips in production of phosphoric acid method activated carbon

Abstract

The invention discloses a screening and drying method for wood chips in the production of phosphoric acid method activated carbon. Devices used in the method comprise a belt conveyor, a first-stage drum screen, a spiral conveying auger, a blast stove, a first-stage dryer, a second-stage dryer, a third-stage dryer, a cyclone separator, a cloth bag deduster, a draught fan and a second-stage drum screen; the wood chips fall into the first-stage drum belt screen from the belt conveyor, then screened qualified wood chips are fed into an air flow drying system by the spiral conveying auger, hot air generated by the blast stove is led into a hot air pipe by the draught fan and enters the second-stage drum screen after passing the cyclone separator, and the cloth bag deduster is connected behind the cyclone separator; wooden fuel used in the blast stove is burnt with limited oxygen, and 15-20 percent of charring materials can be obtained while heat is generated, so the energy is comprehensively used; the hot air can be fully contacted with the wood chips by the three stages of dryers, so the heat utilization efficiency is high; thinner particles can be removed by the two stages of drum screens, so the consumption of ash content and phosphoric acid in the activated carbon can be reduced.

Description

technical field [0001] The invention relates to a method for drying and screening powdery activated carbon wet materials by phosphoric acid process by air flow. technical background [0002] At present, manufacturers of phosphoric acid-based powdered activated carbon use waste wood as fuel for hot blast stoves for drying wood chips, which are completely burned and resources cannot be fully utilized; and wood chips are only screened once to make finer powder particles Sand, fine stones, fine wood chips, etc.) enter the batching system, which not only increases the ash content in the finished activated carbon, but also the fine wood chips will be taken away by water during recycling, rinsing and filtration, resulting in waste of products and consumption of phosphoric acid. Contents of the invention [0003] The technical problem solved by the invention is to provide a method for screening and drying sawdust in the production of activated carbon by phosphoric acid method,...

AI Technical Summary

Problems solved by technology

[0002] At present, manufacturers of phosphoric acid-based powdered activated carbon use waste wood as fuel for hot blast stoves for drying wood chips, which are completely burned and resources cannot be fully utilized; and wood chips are only screened once to make finer powder particles Sand, fine stones, fine wood chips, etc.) enter the batching system, which not only increases the ash content in the finished activated carbon, but also the fine wood chips will be taken away by water during recycling, rinsing and filtration, resulting in waste of products and consumption of phosphoric acid

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