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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

Example Embodiment

[0021] Example 2: Corn stalks were crushed to 2 mm, 45 g of corn stalk powder was added to 10% by mass sodium hydroxide solution for pre-soaking for 8 hours, after filtration, 2% by mass sodium hydroxide solution was added for cooking at 95°C for 6 hours, and then crushed to 3 mm 60g of coal slime and 100g of washed coal, add 18g of coal briquette additives consisting of 45% limestone, 40% kaolin, and 15% sodium carboxymethyl cellulose, mixed with 25ml of water uniformly, forming machine 18 MPa extrusion molding 110 The biomass briquette was dried at ℃ for 1.5 hours. The biomass briquette has a calorific value of 3110 kcal / kg, a compressive strength of 820N / piece, a drop strength of 92.7%, a sulfur fixation rate of 72%, and a water re-drying strength of 218N / piece.

Example Embodiment

[0022] Example 3: Corn stalks were crushed to 1 mm, 40 g of corn stalk powder was pre-soaked with 15% by mass calcium hydroxide solution for 18 hours, after filtration, 2% by mass calcium hydroxide solution was added for cooking at 100°C for 2 hours, and then crushed to 1 mm Coal gangue 50g and washing coal 110g, adding 15g of coal briquette additives composed of 40% limestone, 40% kaolin and 20% sodium carboxymethyl cellulose, mixed with 17ml water uniformly, molding machine 20 MPa extrusion molding 100 ℃ After drying for 2.5 hours, the biomass briquette has a calorific value of 2810 kcal / kg, a compressive strength of 860 N / piece, a drop strength of 90.0%, a sulfur fixation rate of 68%, and a water re-drying strength of 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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