阅读说明：本技术 一种烟煤型煤及其制备方法 (Bituminous coal briquette and preparation method thereof ) 是由 王富奇 许文波 陈勇 王超 魏永启 赵慧杰 王自祥 宋瑞领 于 2020-04-22 设计创作，主要内容包括：本发明提供了一种烟煤型煤及其制备方法,所述的烟煤型煤包括烟煤煤粉、粘结剂、固硫剂和水。所述的制备方法具体包括如下步骤：粉碎后的烟煤煤粉与粘结剂、固硫剂和水按比例搅拌,在搅拌过程中加水混匀制成混合浆液,混合浆液压制成型后烘干得到所述的烟煤型煤。采用烟煤作为煤粉原料,可显著增强型煤的强度,降低了型煤的加工成本,配合市面上优质的节能环保炉具使用,实现了型煤燃烧全程无烟的有益效果,利于型煤的大规模推广利用。(The invention provides a bituminous coal briquette and a preparation method thereof. The preparation method specifically comprises the following steps: the pulverized bituminous coal is stirred with the binder, the sulfur-fixing agent and water in proportion, water is added in the stirring process and mixed evenly to prepare mixed slurry, and the mixed slurry is hydraulically molded and dried to obtain the bituminous coal molded coal. The bituminous coal is used as the pulverized coal raw material, so that the strength of the molded coal can be obviously enhanced, the processing cost of the molded coal is reduced, the smokeless beneficial effect of the whole combustion process of the molded coal is realized by matching with a high-quality energy-saving environment-friendly stove on the market, and the large-scale popularization and utilization of the molded coal are facilitated.)

1. The bituminous coal briquette is characterized by comprising bituminous coal powder, a binder, a sulfur-fixing agent and water.

2. The bituminous coal briquette according to claim 1, characterized in that the bituminous coal briquette comprises the following components in percentage by mass:

the mass percentages of the bituminous coal powder, the binder, the sulfur-fixing agent and the water are 100 wt% in total.

3. The bituminous coal briquette according to claim 1 or 2, characterized in that the bituminous coal briquette comprises the following components in percentage by mass:

the mass percentages of the bituminous coal powder, the binder, the sulfur-fixing agent and the water are 100 wt% in total.

4. A bituminous coal briquette according to any one of claims 1 to 3, characterised in that the binder is bentonite and/or pregelatinized starch;

preferably, the binder is a mixture of bentonite and pregelatinized starch;

preferably, the bentonite accounts for 1-5 wt% of the total mass of the bituminous coal briquette, and further preferably, the bentonite accounts for 1-2 wt% of the total mass of the bituminous coal briquette;

preferably, the pre-gelatinized starch accounts for 1-5 wt% of the total mass of the bituminous coal briquette, and further preferably, the pre-gelatinized starch accounts for 2-5 wt% of the total mass of the bituminous coal briquette;

preferably, the bentonite is sodium bentonite;

preferably, the sulfur fixing agent comprises calcium hydroxide and/or calcium carbonate, and further preferably, the sulfur fixing agent is a mixture of the calcium hydroxide and the calcium carbonate, and the mass ratio of the calcium hydroxide to the calcium carbonate is (1-2): 1.

5. A bituminous coal briquette according to any one of claims 1 to 4, characterized in that the particle size of the bituminous coal fines is less than or equal to 3 mm.

6. A method for preparing a bituminous coal briquette according to any one of claims 1 to 5, characterized in that the method comprises the steps of:

mixing bituminous coal powder, a binder, a sulfur-fixing agent and water in proportion to prepare mixed slurry, and molding and drying the mixed slurry to obtain the bituminous coal briquette.

7. The preparation method according to claim 6, wherein the preparation method specifically comprises the following steps:

the pulverized bituminous coal is stirred with the binder, the sulfur-fixing agent and water in proportion, water is added in the stirring process and mixed evenly to prepare mixed slurry, and the mixed slurry is hydraulically molded and dried to obtain the bituminous coal molded coal.

8. The method according to claim 6 or 7, wherein the pulverized bituminous coal is pulverized to a particle size of 3mm or less.

9. The preparation method according to any one of claims 6 to 8, wherein the pulverized bituminous coal accounts for 70 to 80 wt% of the total mass of the mixed slurry, and more preferably, the pulverized bituminous coal accounts for 72 to 75 wt% of the total mass of the mixed slurry;

preferably, the binder accounts for 2-10 wt% of the total mass of the mixed slurry, and more preferably, the binder accounts for 3-7 wt% of the total mass of the mixed slurry;

preferably, the binder is a mixture of bentonite and pregelatinized starch;

preferably, the bentonite accounts for 1-5 wt% of the total mass of the mixed slurry, and further preferably, the bentonite accounts for 1-2 wt% of the total mass of the mixed slurry;

preferably, the pre-gelatinized starch accounts for 1-5 wt% of the total mass of the mixed slurry, and further preferably, the pre-gelatinized starch accounts for 2-5 wt% of the total mass of the mixed slurry;

preferably, the bentonite is sodium bentonite;

preferably, the sulfur-fixing agent accounts for 10-15 wt% of the total mass of the mixed slurry, and further preferably, the sulfur-fixing agent accounts for 12-13 wt% of the total mass of the mixed slurry;

preferably, the sulfur fixing agent comprises calcium carbonate and/or calcium hydroxide, and further preferably, the sulfur fixing agent is a mixture of calcium hydroxide and calcium carbonate, and the mass ratio of the calcium hydroxide to the calcium carbonate is (1-2): 1;

preferably, the water accounts for 5-15 wt% of the total mass of the mixed slurry, and more preferably, the water accounts for 8-12 wt% of the total mass of the mixed slurry.

10. The preparation method according to any one of claims 6 to 9, wherein the drying temperature is 80 to 120 ℃;

preferably, the drying temperature is 90-105 ℃;

preferably, the drying time is 2-5 h, and further preferably, the drying time is 3-4 h.

Technical Field

The invention belongs to the field of coal product processing, relates to a bituminous coal briquette and a preparation method thereof, and particularly relates to a high-strength bituminous coal briquette and a preparation method thereof.

Background

Most of the products popularized by clean coal enterprises mainly comprise smokeless lump coal, smokeless coal and semi coke, the price is relatively high, the dependence on government subsidies is strong, and the economic burden of users is heavy. The bulk coal heating technologies such as coal-to-electricity, coal-to-gas, semi-coke, anthracite briquette, biomass fuel substitution and the like are widely popularized in part of regions, and due to different technical principles, great differences exist in the aspects of use cost, use effect and pollutant emission reduction.

At present, the types of briquette formulas are more, most briquettes are briquettes taking anthracite fine coal, humic acid and the like as raw materials, and the problems of short combustion time, no moisture resistance, low strength, difficult transportation and the like exist in the use process.

CN109628189A discloses a briquette and a preparation method and a preparation system thereof, wherein the briquette is mainly prepared from the following raw materials in parts by weight: 70-80 parts of semi-coke foam, 20-30 parts of smokeless foam coal, 2-3 parts of adhesive and 6-10 parts of water; the adhesive comprises pre-hydrolyzed potato dregs and pre-gelatinized starch.

CN110272773A discloses a civil high-strength sulfur-fixing briquette and a preparation method thereof, wherein the briquette is prepared by mixing the following components in parts by weight: 65-70 parts of anthracite powder, 12-15 parts of fertilizer coal powder, 1-2 parts of sodium bentonite, 1-2 parts of calcium oxide, 0.5-1.0 part of corn pregelatinized starch, 0.2-0.5 part of silicon dioxide, 0.2-0.5 part of sodium chloride, 0.1-0.2 part of sodium dodecyl benzene sulfonate and 13-15 parts of water. The preparation method of the briquette comprises the following steps: firstly, anthracite and fat coal powder are crushed to the particle size of less than 3mm, and then the crushed anthracite and fat coal powder and solid powder of sodium bentonite, calcium oxide, corn pregelatinized starch, silicon dioxide, sodium chloride and sodium dodecyl benzene sulfonate are added into a stirrer according to a proportion and are mixed uniformly, and then water is added according to a proportion and is mixed uniformly and placed to prepare a mixed material; and finally, pressing and molding the mixed material, and drying to obtain a molded coal product.

CN107523369A discloses a retting-free semi-coke briquette production method, which comprises the following steps: the semi coke is crushed to be less than 3mm and then is sent to a raw material bin, the crushed semi coke and prepared additives are mixed and stirred at normal temperature according to the raw material components and the weight percentage, and then the semi coke is sent to a mixing mill and added with water to be prepared into wet materials. And (3) feeding the wet material after mixing and grinding into a forming machine for compression forming without retting (rotting), feeding the wet molded coal from the forming machine into a closed drying furnace for drying treatment, and directly loading or packaging the dried molded coal.

The anthracite coal has high raw material coal cost, less anthracite resources, poor combustion performance of the coal (problems of high ignition temperature, difficult ignition, poor burnout and the like), and secondary pollution to the environment can be caused by organic matters and heavy metals generated in the production process of the semi coke. The bituminous coal briquette has the advantages of low production cost, wide raw materials and the like, can supplement the market, effectively improves the clean utilization of the bituminous coal and the like.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the bituminous coal briquette and the preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a bituminous coal briquette, which comprises bituminous coal powder, a binder, a sulfur-fixing agent and water.

The invention breaks through the traditional concept in the field, creatively adopts bituminous coal as the coal powder raw material, can obviously enhance the strength of the briquette, reduces the processing cost of the briquette, is favorable for fully applying the bituminous coal resource with rich yield in China, is matched with high-quality energy-saving environment-friendly stoves on the market for use, realizes the beneficial effect that the whole combustion process of the briquette is smokeless, and is favorable for large-scale popularization and utilization of the briquette.

As a preferable technical scheme of the invention, the bituminous coal briquette comprises the following components in percentage by mass:

the mass percentages of the bituminous coal powder, the binder, the sulfur-fixing agent and the water are 100 wt% in total.

Wherein the mass fraction of the pulverized bituminous coal may be 70 wt%, 71 wt%, 72 wt%, 73 wt%, 74 wt%, 75 wt%, 76 wt%, 77 wt%, 78 wt%, 79 wt% or 80 wt%, the mass fraction of the binder may be 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt% or 10 wt%, the mass fraction of the sulfur-fixing agent may be 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt% or 15 wt%, and the mass fraction of the water may be 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt% or 15 wt%, but is not limited to the recited values, and other non-recited values within the range are also applicable.

As a preferable technical scheme of the invention, the bituminous coal briquette comprises the following components in percentage by mass:

the mass percentages of the bituminous coal powder, the binder, the sulfur-fixing agent and the water are 100 wt% in total.

In a preferred embodiment of the present invention, the binder is a mixture of bentonite and pregelatinized starch.

Preferably, the bentonite accounts for 1-5 wt% of the total mass of the bituminous coal briquette, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%, but not limited to the listed values, and other values within the range are also applicable, and more preferably, the bentonite accounts for 1-2 wt% of the total mass of the bituminous coal briquette.

Preferably, the pregelatinized starch accounts for 1-5 wt% of the total mass of the bituminous coal briquette, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%, but not limited to the listed values, and other values within the range are also applicable, and further preferably, the pregelatinized starch accounts for 2-5 wt% of the total mass of the bituminous coal briquette.

Preferably, the bentonite is sodium bentonite.

In the invention, the briquette coal adopting the composite binder has higher thermal stability, can play a better role in fixing ash in the combustion process, reduces the generation of fly ash and reduces the secondary pollution degree of the combustion of the briquette coal.

Preferably, the sulfur-fixing agent comprises calcium hydroxide and/or calcium carbonate, more preferably, the sulfur-fixing agent is a mixture of calcium hydroxide and calcium carbonate, the mass ratio of calcium hydroxide to calcium carbonate is (1-2): 1, for example, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, but not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.

In a preferred embodiment of the present invention, the pulverized bituminous coal has a particle size of 3mm or less, and may be, for example, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm or 3.0mm, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In a second aspect, the present invention provides a method for preparing a bituminous coal briquette according to the first aspect, comprising the steps of:

mixing bituminous coal powder, a binder, a sulfur-fixing agent and water in proportion to prepare mixed slurry, and molding and drying the mixed slurry to obtain the bituminous coal briquette.

As a preferred technical scheme of the present invention, the preparation method specifically comprises the following steps:

the pulverized bituminous coal is stirred with the binder, the sulfur-fixing agent and water in proportion, water is added in the stirring process and mixed evenly to prepare mixed slurry, and the mixed slurry is hydraulically molded and dried to obtain the bituminous coal molded coal.

In a preferred embodiment of the present invention, the pulverized bituminous coal is pulverized to a particle size of 3mm or less, for example, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm or 3.0mm, but the pulverized bituminous coal is not limited to the above-mentioned values, and other values not shown in the above-mentioned range are also applicable.

In a preferred embodiment of the present invention, the pulverized bituminous coal accounts for 70 to 80 wt% of the total mass of the mixed slurry, and may be, for example, 70 wt%, 71 wt%, 72 wt%, 73 wt%, 74 wt%, 75 wt%, 76 wt%, 77 wt%, 78 wt%, 79 wt%, or 80 wt%, but is not limited to the above-mentioned values, and other values not shown in the above-mentioned value range are also applicable, and more preferably, the pulverized bituminous coal accounts for 72 to 75 wt% of the total mass of the mixed slurry.

Preferably, the binder accounts for 2 to 10 wt% of the total mass of the mixed slurry, for example, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, or 10 wt%, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable, and more preferably, the binder accounts for 3 to 7 wt% of the total mass of the mixed slurry.

Preferably, the binder is a mixture of bentonite and pregelatinized starch.

Preferably, the bentonite accounts for 1 to 5 wt% of the total mass of the mixed slurry, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable, and more preferably, the bentonite accounts for 1 to 2 wt% of the total mass of the mixed slurry.

Preferably, the pregelatinized starch accounts for 1-5 wt% of the total mass of the mixed slurry, for example, 1 wt%, 2 wt%, 3 wt%, 4 wt% or 5 wt%, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable, and more preferably, the pregelatinized starch accounts for 2-5 wt% of the total mass of the mixed slurry.

Preferably, the bentonite is sodium bentonite.

Preferably, the sulfur-fixing agent accounts for 10-15 wt% of the total mass of the mixed slurry, for example, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt% or 15 wt%, but not limited to the recited values, and other values within the range are also applicable, and more preferably, the sulfur-fixing agent accounts for 12-13 wt% of the total mass of the mixed slurry.

Preferably, the sulfur-fixing agent comprises calcium carbonate and/or calcium hydroxide, more preferably, the sulfur-fixing agent is a mixture of calcium hydroxide and calcium carbonate, the mass ratio of the calcium hydroxide to the calcium carbonate is (1-2): 1, for example, 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, 1.6:1, 1.7:1, 1.8:1, 1.9:1, 2:1, but not limited to the enumerated values, and other non-enumerated values in the numerical range are also applicable.

Preferably, the water accounts for 5 to 15 wt% of the total mass of the mixed slurry, for example, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt% or 15 wt%, but not limited to the enumerated values, and other non-enumerated values within the range are also applicable, and more preferably, the water accounts for 8 to 12 wt% of the total mass of the mixed slurry.

In a preferred embodiment of the present invention, the drying temperature is 80 to 120 ℃, and may be, for example, 80 ℃, 82 ℃, 84 ℃, 86 ℃, 88 ℃, 89 ℃, 90 ℃, 92 ℃, 94 ℃, 96 ℃, 98 ℃, 100 ℃, 102 ℃, 104 ℃, 106 ℃, 108 ℃, 110 ℃, 112 ℃, 114 ℃, 116 ℃, 118 ℃ or 120 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the drying temperature is 90 to 105 ℃, for example, 90 ℃, 91 ℃, 92 ℃, 93 ℃, 94 ℃, 95 ℃, 96 ℃, 97 ℃, 98 ℃, 99 ℃, 100 ℃, 101 ℃, 102 ℃, 103 ℃, 104 ℃ or 105 ℃, but not limited to the recited values, and other values not recited in the range of the values are also applicable.

Preferably, the drying time is 2 to 5 hours, for example, 2.0 hours, 2.2 hours, 2.4 hours, 2.6 hours, 2.8 hours, 3.0 hours, 3.2 hours, 3.4 hours, 3.6 hours, 3.8 hours, 4.0 hours, 4.2 hours, 4.4 hours, 4.6 hours, 4.8 hours or 5.0 hours, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable, and more preferably, the drying time is 3 to 4 hours.

The recitation of numerical ranges herein includes not only the above-recited numerical values, but also any numerical values between non-recited numerical ranges, and is not intended to be exhaustive or to limit the invention to the precise numerical values encompassed within the range for brevity and clarity.

Compared with the prior art, the invention has the beneficial effects that:

the invention adopts bituminous coal as the coal powder raw material, can obviously enhance the strength of the molded coal, reduces the processing cost of the molded coal, is used by matching with high-quality energy-saving and environment-friendly stoves on the market, realizes the beneficial effect that the molded coal is smokeless in the whole combustion process, and is beneficial to large-scale popularization and utilization of the molded coal.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments.