Preparation method of straw coal

A technology for straw coal and preparation steps, applied in the field of straw coal, can solve the problems of low effective utilization rate of straw coal, direct carbonization of the central part, collision or accumulation and crushing, etc., and achieves a promising market prospect, strong mechanical strength, and a wide range of uses. Effect

Inactive Publication Date: 2017-05-10
CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: the traditional straw coal is easy to be broken due to collision or accumulation after a long storage time, and it is easy to cause the central part to be directly carbonized when burning, and the heat cannot be released to the maximum extent, causing the straw coal to be damaged. For the defect of low effective utilization rate, the present invention infiltrates the straw particles with ethanol, and then performs gas explosion treatment to make the straw structure fluffy, and then performs dry carbonization treatment on the straw particles after gas explosion to remove the papermaking and increase the carbon value , and then mix the carbonized particles with iron nitrate and aluminum isopropoxide to make the surface of the carbonized particles adsorb iron-based oxygen carriers to promote combustion, then mix with peat, etc., and extrude to obtain straw coal
The straw coal prepared by the invention has a fluffy structure, loads an oxygen carrier, promotes combustion, and completely burns heat, and uses extrusion molding to make the internal structure tightly combined, thereby effectively solving the problem of the traditional straw coal being prone to collisions after a long storage time. or pile up broken, and it is easy to cause the central part to be directly carbonized when burning, and the heat cannot be released to the greatest extent, resulting in the defect that the effective utilization rate of straw coal is not high. The present invention crushes corn straw and wheat straw and collects them through sieving Sieve the particles, then mix it with ethanol solution to obtain a mixture, heat the mixture, keep the pressure and collect the mixture to filter, and obtain an extruded product after extrusion, then heat up the extruded product, carbonize it, crush it, and sieve it , collect the sieved particles, then stir and filter them with ferric nitrate and aluminum isopropoxide, etc., and stir the obtained filtrate with peat and paraffin, dry after compression molding, and collect the dried molded product. Straw coal is obtained. The straw coal prepared by the present invention is integrated with straw scraps. The combustion enhancer in the straw matrix not only enhances the bonding strength of the straw coal, but also plays the role of ignition and combustion support. The special structure of the air hole can When the straw coal is in full contact with the air during combustion, the whole straw coal can be completely and fully burned, which improves the effective utilization rate of the straw coal

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0016] According to the mass ratio of 1:1, take corn stalks and wheat stalks, dry them naturally for 1 day, put the air-dried corn stalks and wheat stalks into a pulverizer and grind them, pass through a 50-mesh sieve, and collect the sieved particles, according to the mass ratio of 1: 2. Put the sieved particles and the ethanol solution with a mass fraction of 8% into the mixer, stir at 150r / min for 20min, and collect the stirred mixture; put the above stirred mixture into the steam explosion device, and set the gas explosion pressure to 1.3MPa , the temperature is 43°C, the pressure holding time is 50s, then gas explosion, the mixture after gas explosion is collected, and the mixture after gas explosion is filtered, the filtered material is collected, put into a press, and squeezed for 10min at 10MPa, Collect the extrudate; put the above extrudate into the carbonization furnace, use nitrogen protection, heat up to 190°C at 10°C / min, pre-carbonize for 50min, then raise the tem...

example 2

[0019] According to the mass ratio of 1:1, take corn stalks and wheat stalks, let them dry naturally for 2 days, put the air-dried corn stalks and wheat stalks into a pulverizer and grind them, pass through a 50-mesh sieve, and collect the sieved particles, according to the mass ratio of 1: 2. Put the sieved particles and the ethanol solution with a mass fraction of 8% into the mixer, stir at 150r / min for 25min, and collect the stirred mixture; put the above stirred mixture into the steam explosion device, and set the gas explosion pressure to 1.5MPa , the temperature is 48°C, the holding time is 60s, and then gas explosion, the mixture after gas explosion is collected, and the mixture after gas explosion is filtered, the filtered material is collected, put into a press, and squeezed for 15min at 15MPa, Collect the extrudate; put the above extrudate into the carbonization furnace, use nitrogen protection, heat up to 220°C at 10°C / min, pre-carbonize for 70min, then raise the tem...

example 3

[0022] According to the mass ratio of 1:1, take corn stalks and wheat stalks, let them dry naturally for 2 days, put the air-dried corn stalks and wheat stalks into a pulverizer and grind them, pass through a 50-mesh sieve, and collect the sieved particles, according to the mass ratio of 1: 2. Put the sieved particles and the ethanol solution with a mass fraction of 8% into the mixer, stir at 150r / min for 23 minutes, and collect the stirred mixture; put the above stirred mixture into the steam explosion device, and set the gas explosion pressure to 1.4MPa , the temperature is 45°C, the holding time is 55s, and then gas explodes, collect the mixture after gas explosion, and filter the mixture after gas explosion, collect the filtrate, put it into a press, and squeeze it at 12MPa for 12min, Collect the extrudate; put the above extrudate into the carbonization furnace, use nitrogen protection, heat up to 210°C at 10°C / min, pre-carbonize for 60min, then raise the temperature to 350...

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Abstract

The invention relates to a preparation method of straw coal and belongs to the technical field of straw coal. The preparation method comprises the following steps: crushing maize straws and wheat straws, sieving and collecting sieved grains; then mixing the sieved grains with an ethanol solution to obtain a mixture; carrying out heating and pressure maintenance on the mixture, filtering a collected mixture, and extruding to obtain an extruded material; heating, carbonizing, crushing and sieving the extrude material, collecting the sieved grains, and subsequently carrying out stirring and filtering on the sieved grains, ferric nitrate, aluminum isopropoxide and the like; stirring obtained filtrate with peat and paraffin; carrying out compression molding, drying, and collecting a dried molded substance, thus obtaining the straw coal. The straw coal prepared by the preparation method disclosed by the invention is integrally formed by adopting crushed straw materials; by means of a combustion improver in a straw matrix, the bonding strength of the straw coal is enhanced, and the effects of igniting and supporting combustion are realized; by using air holes with special structures, the straw coal can make sufficient contact with air during combustion; the whole straw coal can be completely and sufficiently combusted, and the effective utilization rate of the straw coal is improved.

Description

technical field [0001] The invention relates to a method for preparing straw coal and belongs to the technical field of straw coal. Background technique [0002] With the rapid development of my country's agriculture and the change of planting structure and mode, the output of straw of agricultural products has increased significantly. Lots of leftovers. In some places, there is even a disaster caused by surplus. Every autumn harvest, a large amount of straw is burned on the spot in the field, which not only wastes precious resources, but also seriously pollutes the environment, and even causes fire disasters. In recent years, crop straws have been made into straw coal as fuel. Straw coal is formed by hot-pressing straw to a certain density to form a stick-shaped material that can be burned. [0003] Straw is a common agricultural production waste, and wheat straw is one of the most common crop straws. Wheat is one of the most important food crops in my country. It is plan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/44
CPCY02E50/10Y02E50/30C10L5/445
Inventor 宋昊赵成浩
Owner CHANGZHOU DINGRI ENVIRONMENTAL PROTECTION TECH
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