Cotton stalk core biomass compression fuel, method for preparing same and comprehensive utilization method of cotton stalks

Abstract

The invention belongs to the technical field of biomass fuel and preparation thereof, and particularly discloses cotton stalk core biomass compression fuel. In the fuel, the cotton stalk core content is 85 to 90 percent, the compressed density of the fuel is 1,100 to 1,400kg / m<3>, the relaxed density is 700 to 900kg / m<3>, and the water content is 8 to 12 percent. The preparation method comprises the following steps of: using the cotton stalks, of which the water content is below 12 percent, as a raw material; performing separating treatment by a cotton stalk skin-core separating machine; crushing the separated cotton stalk cores; molding the cotton stalk cores by compression under a pressure of 70 to 100MPa; and performing cooling and packaging to obtain the finished products, wherein thebyproducts of cotton stalk skin obtained by separation can also be used for spinning and paper-making, so that the comprehensive utilization of the cotton stalks is realized. The cotton stalk core biomass compression fuel has the advantages of high heat efficiency, low ash content, little pollution, no damage to a boiler, convenient transportation and storage and the like; and the process method has the advantages of high process efficiency, low equipment cost, low production cost, good product quality and the like.

Description

technical field [0001] The invention relates to a solid fuel and its preparation and a method for comprehensive utilization of plant materials, in particular to a solid fuel based on plant matter and its preparation and a method for comprehensive utilization of crop straw. Background technique [0002] Cotton is an annual semi-woody plant. Cotton stalks (hereinafter referred to as cotton stalks) refer to cotton stalks with leaves, roots and bolls removed. Cotton stalk is composed of cotton stalk skin and cotton stalk core, of which cotton stalk skin accounts for 25% and cotton stalk core accounts for 75%. From the industrial analysis of cotton stalk biomass, moisture is 6.87%, ash content is 3.97%, volatile matter is 68.54%, and fixed carbon is 20.71%. The ash content of cotton stalks is much lower than that of other crop straws (such as 13.86% for rice straw and 8.9% for wheat straw). The fixed carbon of cotton stalks is 20.71%, which is higher than that of other crop st...

AI Technical Summary

Problems solved by technology

Due to the structural characteristics of cotton stalks, there are the following problems and difficulties when they are directly used as boiler fuel: First, cotton stalks, like other crop straws, have low density and large volume, which brings many difficulties to their collection, transportation and storage. For example, the transportation cost is high, the storage area is large, and the fire prevention cost is high; secondly, the requirements for boiler equipment are relatively high; cotton stalks, like other crop straws, have high moisture and volatile content, low calorific value and ash melting point, and ash content at high temperatures After being lowered into a molten state, it will be bonded into large slag blocks that are difficult to eliminate. At the same time, the alkali metal content in the straw is high, which is easy to cause corrosion to the boiler; For thermal efficiency, the capacity of the boiler must be increased. At the same time, the structure of the fuel delivery system is complex and the technical requirements are high. The existing large-scale biomass power generation equipment in China needs to be imported, and the price is relatively expensive. Most of the fuel-fired power generation companies are in a state of loss. The reason is that the initial investment in the plant is large, the thermal efficiency of the unit is low, and the fuel cost is high. Fourth, the cotton stalks are directly crushed as fuel without fully considering the different characteristics and characteristics of different parts of the cotton stalks. function, not realizing the best use of everything, especially burning cotton stalks, a valuable raw material for industrial production, wasting resources; fifth, due to the existence of bast fibers in cotton stalks, this also makes cotton stalks It is difficult to crush and difficult to compress and form