Method for preparing coal gas, top-grade active carbon, water glass and silicate phosphate from rice hulls

Abstract

The invention relates to a method for preparing coal gas, high-grade active carbon, water glass and silicate phosphate from rice hulls, which comprises the following steps of: smouldering, carbonizing and activating the rice hulls to produce the coal gas for power generation and to obtain rice hull carbon; activating the rice hull carbon with acid and alkaline to obtain low-grade active carbon, packaging the low-grade active carbon in a dust-proof explosion-proof sealed mode, and activating at moderate temperature, secondary high temperature and high temperature to finally obtain the high-grade active carbon and produce the water glass and the silicate phosphate simultaneously. The defect of low-grade active carbon prepared from the rice hull carbon in the prior art is overcome. The invention has reasonable technological method and technological process, and solves the technical obstacles on moderate temperature and high temperature activation of the rice hull carbon. The rice hull carbon obtained after preparing the coal gas from the rice hulls can be directly used for producing the high-grade active carbon, the water glass and the silicate phosphate, and the economical benefits and the social benefits of the rice hulls are effectively increased. Large-scale industrial production can be realized, and a new approach is provided for realizing a complete industrial chain of agriculture industrialization and rice processing.

Description

technical field [0001] The invention relates to a comprehensive development and utilization method of rice husks, in particular to a method for preparing gas, high-grade activated carbon, water glass and silicon phosphate from rice husks. Background technique [0002] Although the utilization of rice husk has existed since ancient times, such as heating as fuel, making toothbrush powder, cosmetic face whitening powder, heat preservation ash, etc., it is basically burned, which not only has a low utilization rate, but also pollutes the environment. In the past 30 years, due to the lack of non-renewable resources, the demand for environmental protection and the development of science and technology, people have made research on the utilization of renewable rice husks, especially the comprehensive utilization, and some progress has been made in the past 10 years. For example, use rice husks to prepare activated carbon or water glass or white carbon black (SiO2), and some have a...

AI Technical Summary

Problems solved by technology

Its advantages are relatively simple equipment, low cost, and easy construction. The disadvantage is that the gas utilization rate is low (generally about 30%), and it is not easy to connect to the grid for power supply; for large-scale power plants (installed capacity ≥ 100 MW), gas turbines are commonly used for power generation. Its biggest advantage That is, the gas utilization rate is high (about 40%), and it is easy to connect to the grid for power supply; for medium-sized power plants, supercritical steam turbines are commonly used to generate electricity, and the gas utilization rate is about 25%. Although it is easy to build, it works in an ultra-high pressure environment. Security issues cannot be ignored

Although the advantages of rice husk power generation are prominent, the biggest problem is that the carbon and silicon in the large amount of rice husk charcoal discharged from the gasifier cannot be effectively separated, and the rice husk carbon cannot be deeply processed, and it can only be used as waste. It not only pollutes the environment, but also wastes resources, and brings great economic and social pressure to power plants.

Images