Heavy metal polluted farmland restoration straw gasification combustion and heat energy grain drying coupling technology

Abstract

The invention discloses a heavy metal polluted farmland restoration straw gasification combustion and heat energy grain drying coupling technology, and belongs to the technical field of biomass thermal conversion. The method comprises the following steps of (1) selecting to establish a straw gasification combustion furnace and grain drying coupling type base near a phytoremediation project; (2) mechanically packaging rice straws subjected to phytoremediation on site, and transporting the packaged rice straws to the grain drying base; (3) directly feeding the straw packages into a gasificationcombustion furnace to be gasified in a gasification chamber, enabling generated combustible gas to enter a combustion chamber to be fully combusted, and generating hot smoke gas; and (4) enabling thehot smoke gas to exchange heat with external air in a heat exchanger, heating the external air to form clean hot air, and feeding the hot air into a grain dryer through a pipeline to dry grains. According to the method, mechanization is completely achieved, and the rice drying cost of farmers can be saved on; and smoke gas after gasification combustion is discharged after dust removal treatment, charcoal ash is recovered in a unified mode, and therefore, the problem of secondary pollution of rice straws polluted by heavy metal is solved.

Description

technical field [0001] The invention relates to the technical field of post-production disposal of heavy metal-contaminated farmland phytoremediation straw and biomass thermal energy conversion and utilization, in particular to an integrated technical method of mechanical packaging of heavy metal-contaminated farmland crop straw-whole package pyrolysis gasification combustion-thermal energy drying of rice. Background technique [0002] At present, my country's soil heavy metal pollution situation is grim. Unlike other organic pollutants, heavy metals are non-biodegradable and will exist in the soil for a long time. Due to their high toxicity and bioaccumulation, heavy metals will be absorbed and enriched by plants and other organisms, and will pass through the food chain in humans and animals. accumulation, causing serious damage to ecosystems and food security, and ultimately endangering human health. [0003] In recent years, phytoremediation technology, as an in-situ eff...

AI Technical Summary

Problems solved by technology

However, due to the low calorific value of heavy metal-contaminated farmland rice straw itself, high content of ash, moisture and heavy metals, and low bulk density leading to high transportation costs, these technologies are directly used for repaired crop straw. High energy, secondary pollution to the environment, unable to realize industrialization

[0005] At the same time, the annual drying of agricultural products consumes a large amount of fossil energy. The consumption of these energy not only increases the economic burden of farmers but also causes some pollution to the environment.

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