阅读说明：本技术 一种无烟生物质燃料颗粒的制备方法 (Preparation method of smokeless biomass fuel particles ) 是由 戈星 王德堂 马海刚 张鑫 赵明杰 于 2020-12-08 设计创作，主要内容包括：本发明提供一种无烟生物质燃料颗粒的制备方法,属于生物质燃料技术领域,具体的,将回收的生物质干燥粉碎成粉末,以聚乙烯醇为粘结剂,沸石为骨架。本发明制备的生物质燃料,在低氧燃烧过程中,没有充分燃尽的碳和灰烬被吸附在沸石上,沸石的多孔结构结构促进了燃烧面积,最终燃烧时间长,燃烧充分,无烟无尘。沸石还可以经过清洗二次利用。(The invention provides a preparation method of smokeless biomass fuel particles, belongs to the technical field of biomass fuels, and particularly relates to a method for drying and crushing recycled biomass into powder, wherein polyvinyl alcohol is used as a binder, and zeolite is used as a framework. In the low-oxygen combustion process of the biomass fuel prepared by the invention, carbon and ash which are not fully combusted are adsorbed on the zeolite, the porous structure of the zeolite promotes the combustion area, the final combustion time is long, the combustion is full, and the biomass fuel is smokeless and dustless. The zeolite can also be washed for secondary use.)

1. a preparation method of smokeless biomass fuel particles is characterized by comprising the following steps:

1) drying and crushing the recovered biomass;

2) uniformly mixing the crushed dry biomass and polyvinyl alcohol to form slurry;

3) spraying the slurry obtained in the step 2) on zeolite by adopting high-pressure spraying to obtain the smokeless biomass fuel particles.

2. The method of claim 1, wherein the biomass is selected from the group consisting of crop straw, peanut hulls, and tree trunks.

3. The method of claim 1, wherein the zeolite has a particle size of 1-5 cm.

4. The preparation method according to claim 1, wherein in the step 2), the components are specifically: 100 parts of crushed dry biomass, 3-6 parts of zeolite and 5-10 parts of polyvinyl alcohol.

5. The method according to claim 1, wherein the polyvinyl alcohol has a molecular weight of 8 to 12 ten thousand and is added in the form of an aqueous solution having a concentration of 70 to 80 wt%.

6. The method of claim 1, wherein the zeolite is washed with water and recycled.

Technical Field

The invention relates to the technical field of biomass fuels, in particular to a preparation method of smokeless biomass fuel particles.

Background

In recent years, with the gradual increase of environmental awareness, the rural area is not allowed to burn straws in a large scale, and most of the straws are treated by composting fermentation at present. However, the fermentation is far from meeting the recovery amount of the straws, so the market demand for the concentrated recovery and combustion of the straws as fuel is increasing, but the straw combustion has the following problems: the combustion is not sufficient, even dry straws can not be completely burnt out.

Therefore, in order to fully combust the biomass fuel, the biomass fuel combustion furnace in the prior art mostly adopts air blowing and air intake, and simultaneously, straws are crushed and granulated, so that the biomass fuel combustion furnace is porous and increases the contact surface area.

However, in the combustion furnace, even if the air intake is sufficient, the main combustion mode is low-oxygen combustion, which results in insufficient final combustion, and during the combustion process, a large amount of smoke is generated due to the floating of hot gas, the main components of the smoke are solid particles (unburned carbon and ash left after burning), high-altitude smoke exhaust is needed, air is polluted, and human use is disturbed.

Disclosure of Invention

Aiming at the problem that a large amount of smoke is generated due to insufficient biomass combustion in the prior art, the invention provides a simple and effective preparation method of smokeless biomass fuel particles.

A method of making smokeless biomass fuel particles, comprising the steps of:

1) drying and crushing the recovered biomass;

2) uniformly mixing the crushed dry biomass and polyvinyl alcohol to form slurry;

3) spraying the slurry obtained in the step 2) on zeolite by adopting high-pressure spraying to obtain the smokeless biomass fuel particles.

Wherein the biomass is crop straw, peanut shell or tree stalk.

Wherein the particle size of the zeolite is 1-5 cm.

Wherein in the step 2), the components are as follows: 100 parts of crushed dry biomass, 3-6 parts of zeolite and 5-10 parts of polyvinyl alcohol.

Wherein, the molecular weight of the polyvinyl alcohol is 8-12 ten thousand, and the polyvinyl alcohol is added in the form of aqueous solution, and the concentration of the aqueous solution is 70-80 wt%.

Wherein, the zeolite can be recycled after being washed by water.

The invention creatively applies the zeolite to the preparation of biomass fuel as a supporting framework, adopts polyethylene glycol as a binder, forms slurry with crushed dry biomass, wraps the slurry on the zeolite, takes the zeolite as a gasification center in the combustion process, and locally heats and disperses the zeolite into a plurality of points, and the dispersed points heat, so that the zeolite can fully combust, and unburned carbon and ash remained after the combustion in the low-oxygen combustion can be adsorbed by the zeolite.

The invention has the beneficial effects

The recovered biomass is fully combusted, and the combustion is smokeless and does not pollute air.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention

Example 1

Drying the recovered straws after exposure to the sun, and crushing the straws into powder by using a crusher for later use;

preparing polyvinyl alcohol into 80wt% aqueous solution for later use;

100kg of straw is taken as a substrate, 10kg of polyvinyl alcohol aqueous solution (containing about 8kg of polyvinyl alcohol) is mixed to form slurry, and the slurry is sprayed on 6kg of zeolite to obtain smokeless biomass fuel particles with the particle size of about 5 cm.

Example 2

Drying the recovered straws after exposure to the sun, and crushing the straws into powder by using a crusher for later use;

preparing polyvinyl alcohol into a 70wt% aqueous solution for later use;

100kg of straw is taken as a substrate, 10kg of polyvinyl alcohol aqueous solution (containing about 8kg of polyvinyl alcohol) is mixed to form slurry, and the slurry is sprayed on 3kg of zeolite to obtain smokeless biomass fuel particles with the particle size of about 4 cm.

Comparative example 1

Drying the recovered straws after exposure to the sun, and crushing the straws into powder by using a crusher for later use;

preparing polyvinyl alcohol into 80wt% aqueous solution for later use;

100kg of straw is taken as a substrate, 5kg of polyvinyl alcohol aqueous solution (containing about 3kg of polyvinyl alcohol) is mixed to form semi-dry material, and the semi-dry material is sent to a granulator to be kneaded into granules with the grain diameter of about 6 cm.

Test of Combustion Effect

Examples 1 and 2, comparative example 1 were added to a biomass pellet real fire fireplace of this company to perform a combustion process.

The refiring process is performed on the burning ash of each embodiment to detect whether the burning is sufficient.

Summary data are as follows: