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Method for preparing biomass briquette by virtue of lower-calorific-value coal

A low calorific value, biomass technology, applied in the direction of biofuels, waste fuels, solid fuels, etc., can solve the problem of ignoring the bonding effect, and achieve the effect of reducing production costs, being conducive to industrial utilization, and improving water resistance

Inactive Publication Date: 2013-04-03
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above patents all use local biomass resources to prepare biomass briquettes, but use bituminous coal and anthracite pulverized coal as the main raw materials, ignoring the wastes after coal mining and washing such as low calorific value coal gangue, coal slime, and washed medium coal. The conversion and utilization of corn stalks and other biomass (containing chemical components such as lignin)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Corn stalks are crushed to 3 mm, 40 g of corn stalk powder is added to 20% by mass fraction of calcium hydroxide solution for pre-soaking for 6 hours, after filtration, 3% by mass fraction of sodium hydroxide solution is added to cook at 90°C for 4 hours, and then crushed to 3 mm Coal slime 160g, coal gangue 20g, add briquette additive 20g composed of mass fraction 50% limestone, 40% kaolin, 10% sodium carboxymethyl cellulose, mix with 20ml water evenly, extrude at 120℃ with 15 MPa molding machine Dry for 1.5 hours to obtain biomass type coal. The calorific value of biomass briquette coal is 3004 kcal / kg, the compressive strength is 780N / piece, the drop strength is 91.8%, the sulfur fixation rate is 70%, and the strength after soaking in water and re-drying is 240N / piece.

Embodiment 2

[0021] Example 2: Corn stalks are crushed to 2mm, 45g of corn stalk powder is added to 10% by mass fraction of sodium hydroxide solution for presoaking for 8 hours, after filtration, 2% by mass fraction of sodium hydroxide solution is added to cook at 95°C for 6 hours, and then crushed to 3mm Coal slime 60g and washed medium coal 100g, add briquette additive 18g composed of mass fraction 45% limestone, 40% kaolin, 15% sodium carboxymethyl cellulose, mix with 25ml water evenly, extrusion molding machine 18 MPa 110 Drying at ℃ for 1.5 hours produced biomass briquettes. The calorific value of biomass briquettes was 3110 kcal / kg, the compressive strength was 820N / piece, the drop strength was 92.7%, the sulfur fixation rate was 72%, and the soaking and re-drying strength was 218N / piece.

Embodiment 3

[0022] Example 3: Corn stalks are crushed to 1 mm, and 40 g of corn stalk powder is added to 15% by mass fraction of calcium hydroxide solution for pre-soaking for 18 hours. 50g of coal gangue and 110g of washed medium coal, add 15g of briquette additive consisting of 40% limestone, 40% kaolin and 20% sodium carboxymethyl cellulose, mix evenly with 17ml of water, extrude at 20 MPa with a molding machine at 100°C The biomass briquettes were dried for 2.5 hours. The calorific value of the biomass briquettes was 2810 kcal / kg, the compressive strength was 860 N / piece, the drop strength was 90.0%, the sulfur fixation rate was 68%, and the soaking and re-drying strength was 163N / piece.

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Abstract

The invention discloses a method for preparing biomass briquette by virtue of lower-calorific-value coal. The method disclosed by the invention comprises the following steps of: after biomass is crushed, presoaking the crushed biomass in alkali liquor, and carrying out high-temperature stewing on the biomass in the alkali liquor; adding the crushed lower-calorific-value coal and a right amount of additives into the alkali liquor; and finally, uniformly mixing water with the obtained mixture, and forming the obtained product in a forming machine at a high pressure so as to obtain a biomass briquette product. According to the method, the lower-calorific-value coal and the biomass are mixed to produce the biomass briquette, the advantages of the coal and the biomass are fully utilized to improve the combustion characteristics and the heat utilization rates of the coal and the biomass, the efficient and clean utilization of limited coal resources, especially low-quality coal, in China is realized, and the resource and energy utilization of agricultural wastes, such as corn straws, is realized, therefore, the method has a great significance to the nearby efficient conversion of biomass resources such as lower-calorific-value coal resources and corn straws and the like and the improvement of the utilization efficiency of coal resources, and accords with the development of a clean coal technology of China.

Description

technical field [0001] The invention relates to a method for preparing biomass briquettes from low calorific value coal, and belongs to the field of resource utilization of coal mining and washing waste and agricultural waste. Background technique [0002] my country is a big country of coal production and consumption, and a large amount of low calorific value coal resources such as coal gangue, coal slime, and washed medium coal are produced in the process of coal production and washing. my country produces more than 300 million tons of low calorific value coal resources such as gangue, coal slime, and washed medium coal every year. The low calorific value coal power generation units that have been built can only consume more than 100 million tons of low calorific value coal resources each year, and there are still a large number of existing And the 200 million tons newly added every year have not been rationally and effectively utilized. A large amount of unused coal gangu...

Claims

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Application Information

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IPC IPC(8): C10L5/44
CPCY02E50/30Y02E50/10
Inventor 蔡禄马力通李珺
Owner INNER MONGOLIA UNIV OF SCI & TECH
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