Pretreatment method for densifying rice and wheat straw solid briquette fuel

Abstract

The invention relates to a straw treatment process, in particular to a pretreatment method for densifying rice and wheat straw solid briquette fuel. The pretreatment method for densifying the rice and wheat straw solid briquette fuel comprises the following steps of: grinding straws with moisture content of less than or equal to 12 weight percent; adding a small amount of ammonia water or / and quick lime into water to prepare a spraying solution, wherein the amount of the ammonia water or / and the quick lime is 1 to 2 percent of the total amount of the spraying solution; spraying the prepared spraying solution on ground straw materials so as to wet the ground straw materials; placing the wet ground straw materials into a fermentation tank to ferment for 8 to 12 hours; and adding potassium chlorate or / and potassium nitrate into the fermented ground straw materials and uniformly stirring, wherein the adding amount of the potassium chlorate or / and the potassium nitrate is 2 to 3 percent of the total amount of the ground straw materials. Oxytolerant and alkaline-resisting cellulose decomposing brevibacterium domesticated manually can also be added into the spraying solution and the adding amount of the oxytolerant and alkaline-resisting cellulose decomposing brevibacterium is 0.5 to 1.5 percent of the total amount of the spraying solution. By the pretreatment method, original structural ingredients of a straw material can be effectively changed, the carbon element is kept, the caking property is improved, a hydrogen bond in the straws is destroyed (so that the straws are of a regular structure), cellulose in the straws is partly degraded and compact waxiness contained on the surfaces of the straws is decomposed, so that the straws are softened and are easy to process and form.

Description

technical field [0001] The invention relates to a straw treatment process, in particular to a pretreatment method for compacting rice straw solid molding fuel. Background technique [0002] Cellulose is the largest renewable resource on the earth, accounting for 35% to 50% of the dry weight of plants, and is the most widely distributed and abundant carbohydrate on the earth. For humans, it is the largest amount of renewable substances in nature. Crop straw is an important source of agricultural organic materials. At present, the annual output of crop straw in the country is more than 700 million tons, which can be converted into 660,000 tons of nitrogen fertilizer, 9.66 million tons of potassium fertilizer, and 960,000 tons of phosphate fertilizer, which is equivalent to 1 / 3 of the country's annual chemical fertilizer consumption. 4. However, with the improvement of social economy and living standards in recent years, the effective utilization rate of straw resources in my...

AI Technical Summary

Problems solved by technology

[0004] However, the problem of high-energy compression and compact solidification of straw has long been the bottleneck that limits the utilization of fuel straw, especially light rice and wheat straw, which not only has a low density, but also has a dense layer of wax on the surface. The equipment requirements are very high, and proper pretreatment can significantly reduce the difficulty of the process