Circulating utilization device and method for preparing charcoal-based organic fertilizer by fixed bed straw carbonizing

Abstract

The invention provides a circulating utilization device and method for preparing charcoal-based organic fertilizer by fixed bed straw carbonizing. A straw forming device is connected with a fixed bedstraw carbonizing device; the upper part of the fixed bed straw carbonizing device is connected with an air heat exchanger, and the center of the fixed bed straw carbonizing device is connected with asteam heat exchanger through a pipeline; the bottom part of the fixed bed straw carbonizing device is connected with a mixing device; the back part of a biomass extracting liquid collecting device isconnected with a gas combustion chamber; the back part of the gas combustion chamber is sequentially connected with the steam heat exchanger and the air heat exchanger; the back part of the air heatexchanger is connected with a drying device. The circulating utilization device has the advantages that a small amount of high-temperature air is uniformly led into the fixed bed straw carbonizing device, so as to meet the requirement on energy required by the pyrolysis gasifying reaction of straw, and carbonize the straw into straw charcoal under a low-oxygen environment; the reaction temperatureis controlled by water steam, the gap structure of the straw charcoal is improved, the quality of the charcoal is improved, and the content of carbon in the straw charcoal can reach 45% or above.

Description

technical field [0001] The invention relates to the technical field of biomass utilization, in particular to a recycling device and method for preparing carbon-based organic fertilizers by carbonizing fixed-bed straws. Background technique [0002] my country produces more than 900 million tons of agricultural straw every year, but less than 40% of the existing straw is used, and most of the remaining straw is discarded and burned at will, causing a large area of ​​pollution. The traditional method of returning straw to the field will cause problems such as soil compaction, intensified pests and diseases, and greenhouse gas emissions. The government put forward the concept of "recycling, full-value utilization, and step-by-step utilization", and increased the utilization rate of straw through subsidies and other means. However, due to the special characteristics of raw materials of straw, its biomass ash melting point is low, it is easy to mildew and rot, and the cellulose c...

AI Technical Summary

Problems solved by technology

[0002] my country produces more than 900 million tons of agricultural straw every year, but less than 40% of the existing straw is used, and most of the remaining straw is discarded and burned at will, causing large-scale pollution

The traditional method of returning straw to the field will cause problems such as soil compaction, aggravated pests and diseases, and greenhouse gas emissions

The government put forward the concept of "recycling, full-value utilization, and step-by-step utilization", and increased the utilization rate of straw through subsidies and other means. However, due to the special characteristics of raw materials of straw, its biomass ash melting point is low, it is easy to mildew and rot, and the cellulose content is low. The characteristics of high lignin content and low content make it difficult to effectively use it in the existing industrial methods. As a fuel, the combustion temperature is low and the efficiency is low; as a structural product, it has low strength and is easy to deform; as a biochar product, the charcoal quality is low and the price is lower than that of bamboo charcoal. Other biochar prices are low

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