Manufacturing method of anti-sintering biomass fuel

Abstract

The invention relates to the field of biological energy sources, in particular to an anti-sintering biomass fuel. According to the manufacturing method of the anti-sintering biomass fuel, biomass materials and an anti-sintering agent are adopted, and the biomass materials comprise straw and rice hulls; walnut shells and miscellaneous trees; the adding mass fraction of each substance is 25-50 parts of the straw; 15 to 25 parts of rice husk; 5-10 parts of walnut shells; 5-13 parts of weed tree; and 0.5-2 parts of an anti-sintering agent, wherein the anti-sintering agent is a water-containing aluminosilicate mineral. The biomass fuel disclosed by the invention is low in water content, high in combustion value, low in ash content, low in water content and capable of separating ash and slag. The combustion time is long, and when the temperature reaches about 450 DEG C, hydroxyl groups between layers of the anti-coking agent overflow in the form of water, so that the anti-coking agent is not easy to slag.

Description

Technical Field

[0001] The invention relates to the field of bioenergy, and in particular to a sintering-resistant biomass fuel. Background Art

[0002] During the combustion of biomass, because biomass contains more water and alkaline metal substances (especially crop straw), concrete residues in building templates, and glue residues in furniture plywood. During combustion, it is easy to cause ash accumulation and slagging to damage the combustion bed, and sintering may also occur. The high alkali metal content (K, Na) in biomass leads to a low ash melting point of biomass, which brings many problems to the combustion process. In the process of combustion and utilization, high alkali metal content is an important factor causing ash, slagging and corrosion on the heating surface of the boiler, which will directly reduce the life of the boiler and thermal efficiency. At the same time, high alkali metal content is also easy to cause the agglomeration of bed materials, slagging destroys the fluidization in the bed, and worsens the combustion conditions. It may even cause the accumulation of ash and slag on the grate bars and flameout. Summary of the invention

[0003] In view of the above problems, the present invention provides a method for producing sintering-resistant biomass fuel to solve the sintering-resistant problem.

[0004] The technical problem to be solved by the present invention is achieved through the following technical solutions: A method for manufacturing an anti-sintering biomass fuel comprises biomass materials and an anti-sintering agent, wherein the biomass materials comprise straw, rice husk, walnut shell, and miscellaneous wood; the added mass fraction of each substance is 25-50 parts of straw; 15-25 parts of rice husk; 5-10 parts of walnut shell; 5-13 parts of miscellaneous wood; and 0.5-2 parts of the anti-sintering agent, wherein the anti-sintering agent is a hydrated aluminum silicate mineral.

[0005] According to the method for producing the anti-sintering biomass fuel, the anti-sintering agent is composed of silicon-oxygen tetrahedrons and aluminum-oxygen octahedrons. The silicon-oxygen tetrahedrons are composed of silicate anions arranged, and the aluminum-oxygen octahedrons are composed of aluminum ions and hydroxide ions.

[0006] According to the method for producing the anti-sintering biomass fuel, the straw is corn straw.

[0007] According to the method for producing the anti-sintering biomass fuel, the moisture content of the straw and rice husk is ≦10%.

[0008] According to the method for producing the anti-sintering biomass fuel, the moisture content of the miscellaneous wood is ≤6%.

[0009] Compared with conventional biomass fuel particles formed by compression molding with straw, the biomass fuel of the present invention has low moisture content, high combustion value, low ash content, low moisture content, and ash-slag separation. The combustion time is long. When the temperature reaches about 450°C, the hydroxyl groups between the layers of the biomass fuel particles that are resistant to coking will overflow in the form of water and transform into an amorphous structure. The reaction formula is AI2SI2O5(OH)4→AI2SI2O7+2H2O; △H=773KJ / kg. The particles react chemically with oxygen in the air to release heat. The added anti-sintering agent can be converted into acidic oxides in situ, which can effectively adjust the properties of the biomass fuel particles, making them less likely to slag, and the biomass fuel particles do not emit harmful gases after combustion. DETAILED DESCRIPTION

[0010] The present invention is described in detail below with reference to the examples. The examples are only preferred embodiments of the present invention and are not intended to limit the present invention.

[0011] Unless otherwise specified, the anti-sintering agent of the present invention is prepared according to the following method.

[0012] The mass fraction of the added substances is 25-50 parts of straw, 15-25 parts of rice husk, 5-10 parts of walnut shell, 5-13 parts of miscellaneous wood, and 0.5-2 parts of anti-sintering agent, which is a hydrous aluminum silicate mineral. The hydrous aluminum silicate mineral is composed of silicon oxygen tetrahedron and aluminum oxygen octahedron, the silicon oxygen tetrahedron is composed of silicate anions, and the aluminum oxygen octahedron is composed of aluminum ions and hydroxide ions.

[0013] The anti-sintering agent is composed of silicon-oxygen tetrahedron and aluminum-oxygen octahedron. The silicon-oxygen tetrahedron is composed of silicate anions, while the aluminum-oxygen octahedron is composed of aluminum ions and hydroxide ions.

[0014] Hydrous aluminum silicate minerals are available on the market, have good plasticity, and have coal series, and can increase the melting temperature of the particles in accordance with the hierarchical structure described above. It has the characteristics in the following table. The organic matter that passes through is directly ground into a powder of about 300 meshes by a small ball mill with 1.2×1.4 particle balls, and the hydrous aluminum silicate minerals are added to the different raw material components, and the finished particles are squeezed into the pellet machine.

[0015] Properties of Hydrous Aluminosilicate Minerals In the following examples, the moisture content of straw, rice husk and miscellaneous wood is strictly controlled according to the content of the invention.

[0016] Example 1 The method for preparing anti-sintering biomass fuel comprises the following components in parts by weight: 35 parts of corn stalks, 18 parts of rice husks, 8 parts of walnut shells, 7 parts of miscellaneous wood, and 1 part of anti-sintering agent.

[0017] The invention uses a novel anti-sintering agent which is composed of inorganic and organic polymers and can be in situ converted into acidic oxide ZnO with large specific surface area and porous morphology during heating, thereby increasing the ash melting temperature and reducing slagging.

[0018] Example 2 The manufacturing method of the anti-sintering biomass fuel comprises the following components in parts by weight: 25 parts of corn stalks; 25 parts of rice husks; 10 parts of walnut shells; 10 parts of miscellaneous wood; and 0.5 parts of an anti-sintering agent.

[0019] Example 3 The method for producing anti-sintering biomass fuel is composed of the following components in parts by weight: 48 parts of corn stalks: 21 parts of rice husks: 5 parts of walnut shells: 5 parts of miscellaneous wood: 1.8 parts of anti-sintering agent.

[0020] Comparative Example 1 A sintering-resistant biomass fuel, comprising the following components in parts by weight: 48 parts of corn stalks: 21 parts of rice husks; 5 parts of walnut shells; 5 parts of miscellaneous wood.

[0021] Combustion value test The combustion value test adopts GB 213——2008 The combustion value of standard coal is 29.26 MJ / kg.

[0022] After testing, the combustion value of Example 1 is 16.10 MJ / kg; the combustion value of Example 2 is 16.50 MJ / kg; the combustion value of Example 3 is 17.50 MJ / kg; and the combustion value of Comparative Example 1 is 15.90 MJ / kg.

[0023] The biomass fuels of Example 3 and Comparative Example 1 of the present invention were used in two new boilers for one month. After one month, it was found that the boiler using the biomass fuel of Comparative Example 1 had no obvious slagging; while the boiler using Example 3 had no obvious change, indicating that the biomass fuel particles of the present invention have a good anti-sintering effect by adding a new anti-sintering agent.

[0024] The above-mentioned embodiments merely express the implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the patent scope of the present invention. Any technical solution obtained in the form of equivalent replacement or equivalent transformation shall fall within the protection scope of the present invention.

Claims

1. A method for producing anti-sintering biomass fuel, characterized in that: It includes biomass materials and anti-sintering agents, wherein the biomass materials include straw, rice husk, walnut shell, and miscellaneous wood; the added mass fraction of each substance is 25-50 parts for straw; 15-25 parts for rice husk; 5-10 parts for walnut shell; 5-13 parts for miscellaneous wood; and 0.5-2 parts for anti-sintering agent. In fact, the anti-sintering agent is a hydrated aluminum silicate mineral.

2. The method for producing the anti-sintering biomass fuel according to claim 1, characterized in that: The anti-sintering agent is composed of silicon-oxygen tetrahedron and aluminum-oxygen octahedron. The silicon-oxygen tetrahedron is composed of silicate anions, while the aluminum-oxygen octahedron is composed of aluminum ions and hydroxide ions.

3. The method for producing the anti-sintering biomass fuel according to claim 1, characterized in that: The straw is corn straw.

4. The method for producing the anti-sintering biomass fuel according to claim 1, characterized in that: The moisture content of the straw and rice husk is ≤10%.

5. The method for producing anti-sintering biomass fuel according to claim 1, characterized in that: The moisture content of the miscellaneous wood is ≤6%.

Images