Abstract
Take plastic waste and dried sludge as raw materials, use pressure testing machine and high temperature hot pressing mold to test under different parameters. The effect of raw material ratio, low-temperature pyrolysis temperature, molding pressure and heating time on the physical properties of the molded fuel after low-temperature pyrolysis, such as relaxation density, fall strength, compressive strength and water permeability, are studied. Single factor tests show that the general range of mixed molding parameters is: mixture ratio (dry sludge: composite plastics) 85:15~75:25, temperature 150~250°C, heating time 20~40min, compaction pressure 2~6MPa. Orthogonal test is designed on the basis of single factor test. The results show that the most important factor affecting the relaxation density of molding fuel is molding pressure, the most important factor affecting compressive strength is the ratio of raw materials, and the most important factor affecting water permeability is heating time. The fall strength is less affected by various factors. It is due to the stickiness of the molded plastic after softening, which strengthens the “cohesion” between the raw materials, and will not be explored in the orthogonal experiment. The optimal combination of relaxation density molding parameters is the ratio (dry sludge: composite plastics) 80:20, temperature 250°C, heating time 30min, compaction pressure 6MPa; the optimal combination of compressive strength molding parameters is 75:25, 250°C, 30min, 6MPa; the optimal combination of anti-moisture absorption performance molding parameters is 85:15, 150°C, 30min, 2MPa.
Highlights
With the rapid economic development, my country’s urban sewage treatment volume has been increasing year by year, and the sludge output has increased [1]
Dry sludge and composite plastics are used to prepare formed fuels, and the physical properties of formed fuels are evaluated with relaxation density, moisture absorption resistance, fall strength, and compressive strength as indicators
The general range of the mixing molding parameters of dry sludge and composite plastic obtained through single factor experiment is: ratio 85:15~75:25, temperature 150~250°C, time 20~40min, The compaction pressure is 2~6MPa
Summary
With the rapid economic development, my country’s urban sewage treatment volume has been increasing year by year, and the sludge output has increased [1]. How to effectively use sludge and eliminate the pollution caused by its utilization process to the environment has become the focus of people's research. In order to reduce pollution, low-temperature pyrolysis technology as a waste utilization method has attracted widespread attention [10,11], but most of the current research focuses on the use of low-temperature pyrolysis technology to prepare liquid fuels. The obtained fuel has the advantages of high calorific value, good drop resistance, compression resistance, moisture absorption resistance, and convenient transportation and storage
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