CN115651691A

CN115651691A - High-temperature barbecue charcoal with high calorific value and preparation method thereof

Info

Publication number: CN115651691A
Application number: CN202211463074.XA
Authority: CN
Inventors: 袁鑫; 雷小英; 袁志业
Original assignee: Lanshan Xinwang Bamboo Industry Co ltd
Current assignee: Lanshan Xinwang Bamboo Industry Co ltd
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-01-31

Abstract

The invention discloses high-temperature barbecue charcoal with high calorific value and a preparation method thereof, wherein the preparation method comprises the following steps: 1) Pretreatment of raw materials: magnetic separation and activation of the gasified fine slag; 2) Coarse crushing of raw materials: conveying sawdust, plant straws and gasified fine slag subjected to magnetic separation and activation in the step 1) into a crusher for coarse crushing to obtain coarse powder raw materials with the particle size of 4-5 meshes; 3) Drying; 4) Gas-material separation; 5) Fine grinding; 6) Cooling; 7) Extrusion forming; 8) Carbonizing: and putting the extruded carbon rod into a carbonization furnace, carbonizing at 400-600 ℃ for 1-1.5h, and then carbonizing at 600-1200 ℃ for 0.5-1h. According to the invention, the gasified fine slag subjected to magnetic separation and activation is added, so that the resource recovery utilization rate of the gasified fine slag is improved, and the pollution of the gasified fine slag and landfill to the environment is prevented; and the specific surface area of the gasified fine slag can be increased through activation treatment, the mixture of the gasified fine slag, sawdust and straw is facilitated, and the yield and the combustion performance of the high-temperature barbecue charcoal are improved.

Description

High-temperature barbecue charcoal with high calorific value and preparation method thereof

Technical Field

The invention relates to the technical field of high-temperature barbecue charcoal preparation, in particular to high-temperature barbecue charcoal with a high calorific value and a preparation method thereof.

Background

The high-temperature barbecue charcoal belongs to a machine-made charcoal, and raw materials for preparing the high-temperature barbecue charcoal have wide sources, such as rice husks, peanut shells, cotton shells, corncobs, cornstalks, sorghum stalks and the like which can be used as raw materials for producing the rod charcoal, and sawdust, wood shavings and bamboo shavings are the best. The high-temp. charcoal is made up through such technological steps as baking in baking oven to obtain standard raw material with proper dry humidity, cooling, shaping, high-temp. high-pressure plasticizing, shaping to obtain semi-finished carbon rod, and charring in charring furnace.

There are many methods for preparing high temperature barbecue charcoal in the prior art, for example, patent application No. CN201510811208.6 discloses a method for preparing machine-made charcoal, which comprises the following steps: 1) Selecting materials: selecting 20-30 parts of cotton straw, 10-16 parts of cotton hull and 25-30 parts of rice hull; 2) And (3) light drying: placing cotton stalk and cotton hull in the sun and sun-drying for 4-5 days, placing rice hull in the sun and sun-drying for 1-2 days; 3) Crushing: respectively feeding the cotton straw, the cotton hull and the rice stick which are subjected to the light drying in the step 2) into a crusher for crushing treatment to respectively obtain cotton straw powder, cotton hull powder and rice flour; 4) Drying: feeding the cotton straw powder obtained after the crushing in the step 3) and cotton hulls into a dryer for drying treatment for 2-3h at the drying temperature of 140-150 ℃; 5) Preparing a bar: feeding the dried cotton straws, the cotton hulls and the crushed rice flour obtained in the step 3) into a mixer for mixing and stirring, and then extruding the mixed mixture to form a hollow firewood rod; 6) Carbonizing: and (3) carrying out carbonization reaction on the prepared firewood rod, wherein the carbonization reaction time is 6-7 days, and the temperature is 490-500 ℃. The machine-made charcoal utilizes cotton straws, cotton hulls and rice to replace wood chips or other high-cost raw materials in the traditional industry, reduces the production cost, solves the problem of overhigh cost of the machine-made charcoal, and improves the development space of enterprises.

Although the method for preparing the high-temperature barbecue charcoal (machine-made charcoal) can reduce the use cost of raw materials, the method does not relate to the yield, the calorific value and the burning time of the produced high-temperature barbecue charcoal, and the yield, the calorific value and the burning time of the high-temperature barbecue charcoal produced by the prior art are lower, so that the market demand can not be met, and the market value and the product quality of the high-temperature barbecue charcoal are reduced.

Therefore, how to provide a method which can not only reduce the use cost of raw materials, but also ensure that the prepared high-temperature barbecue charcoal has high yield and better combustion performance is a problem to be solved urgently.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the preparation method is simple and low in cost, and the preparation method not only improves the yield of the high-temperature barbecue charcoal, but also improves the combustion performance of the high-temperature barbecue charcoal.

The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of high-temperature barbecue charcoal with high calorific value comprises the following steps: 1) Pretreatment of raw materials: magnetic separation and activation of the gasified fine slag; 2) Coarse crushing of raw materials: conveying sawdust, plant straws and gasified fine slag subjected to magnetic separation and activation in the step 1) into a crusher for coarse crushing to obtain coarse powder raw materials with the particle size of 4-5 meshes; 3) Drying; 4) Gas-material separation; 5) Fine grinding; 6) Cooling; 7) Extrusion molding; 8) Carbonizing: and putting the extruded carbon rod into a carbonization furnace, carbonizing at 400-600 ℃ for 1-1.5h, and then carbonizing at 600-1200 ℃ for 0.5-1h.

The gasification fine slag is one of the coal gasification slag, and in a coal gasification technical system, most of carbon substances in coal are converted into gas, and simultaneously, inorganic mineral components, added catalyst and residual carbon substances which are not completely gasified in raw coal are discharged in the form of residue (coal gasification slag). Depending on the discharge mode, the gasified slag is divided into gasified coarse slag and gasified fine slag, wherein the gasified coarse slag is the residue discharged from the bottom of the coal gasifier, the gasified fine slag is the residue entrained by the gasified coal gas and separated in the purification process after the gasified coal gas leaves the coal gasifier, and the gasified fine slag has high carbon content, irregular-shaped particles and highly developed pore structure.

Further, a magnetic separator is adopted for magnetic separation to remove heavy metals in the gasified fine slag, the magnetic field intensity in the magnetic separation stage is 1-1.5T, the heavy metals comprise ferric oxide, titanium oxide, manganese oxide and chromium oxide, the content of the ferric oxide in the gasified fine slag after the magnetic separation treatment is controlled to be below 0.1%, and the content of other heavy metals is controlled to be below 0.02%.

Further, the specific operation steps of the activation are as follows: and (3) feeding the gasified fine slag subjected to magnetic separation into a modified solution according to a material-liquid ratio of 1.

Furthermore, the concentration of the potassium permanganate is 0.05-1g/L, and the concentration of the sodium dodecyl sulfate is 0.1-2g/L.

Further, the weight ratio of the sawdust to the plant straws to the gasified fine slag is 1.

Further, the drying temperature is 80-90 ℃, the drying time is 1-2h, and the moisture content in the dried raw material is 30%.

Further, the specific operation steps of the step 4) are as follows: and (4) separating gas and powder from the dried mixture in a cyclone separator.

Further, the specific operation steps of step 5) are as follows: and feeding the powder after gas-material separation into a pulverizer for fine pulverization to obtain a fine powder raw material with the particle size of 12-20 meshes.

Further, the specific operation steps of step 7) are as follows: and (3) sending the cooled fine powder raw material into a rod-making forming machine for forming and processing a semi-finished product to obtain the carbon rod, wherein the heating temperature in the machine is 300-400 ℃.

The invention also provides high-temperature barbecue charcoal with high calorific value, which is prepared by the preparation method.

The high-temperature barbecue charcoal with high calorific value and the preparation method thereof have the beneficial effects that:

(1) According to the invention, the magnetic separation and activation of the gasified fine slag are added into the raw materials for preparing the high-temperature barbecue charcoal, so that the resource recovery rate of the gasified fine slag is effectively improved, the pollution of the gasified fine slag on the environment due to direct landfill is prevented, and the application range of the gasified fine slag is expanded; the specific surface area and the dispersibility of the gasified fine slag can be improved through activation treatment, so that the gasification fine slag is favorably mixed with sawdust and straws, and the combustion heat value, the yield and the combustion time of the high-temperature barbecue charcoal are improved;

(2) The high-temperature barbecue charcoal is carbonized at low temperature and high temperature, after the high-temperature barbecue charcoal is carbonized at 400-600 ℃ for 1-1.5h, hemicellulose in the raw materials is basically and completely decomposed, cellulose and lignin are largely decomposed, and the structure of the product tends to be stable; after carbonization is carried out for 0.5-1h at the temperature of 600-1200 ℃, cellulose and lignin are completely decomposed, the yield of the high-temperature barbecue charcoal is stable, the whole carbonization time is 1.5-2.5h, and the carbonization time is effectively shortened.

Drawings

FIG. 1 is a schematic process flow diagram of a method for preparing high-temperature barbecue charcoal with high calorific value according to the present invention;

FIG. 2 is the effect of the ratio of the modifying solution to the gasified fine slag on the specific surface area of the gasified fine slag after activation;

FIG. 3 is a graph showing the effect of the ratio of the modifying solution to the gasified fine slag on the heat value of combustion of the high temperature roast carbon;

FIG. 4 is a graph showing the effect of the ratio of the modifying solution to the gasified fine slag on the yield of the high-temperature roast carbon.

Detailed Description

The invention is further illustrated with reference to the following figures and examples, which are not intended to limit the scope of the invention in any way.

Example 1

Referring to fig. 1, a method for preparing high-temperature barbecue charcoal with high calorific value includes the following steps:

1) Pretreatment of raw materials: magnetic separation and activation of the gasified fine slag:

the magnetic separation comprises the following specific operation steps: a magnetic separator is adopted to remove heavy metals in the gasified fine slag, the magnetic field intensity in the magnetic separation stage is 1.2T, the heavy metals comprise ferric oxide, titanium oxide, manganese oxide and chromium oxide, the content of the ferric oxide in the gasified fine slag after the magnetic separation treatment is controlled to be below 0.1 percent, and the content of other heavy metals is controlled to be below 0.02 percent;

the specific operation steps of the activation are as follows: feeding the gasified fine slag subjected to magnetic separation into a modified solution according to a material-liquid ratio of 1;

2) Coarse crushing of raw materials: the sawdust, the plant straws and the gasified fine slag subjected to magnetic separation and activation in the step 1) are sent into a pulverizer according to the weight ratio of 1.5 to be coarsely pulverized to obtain coarse powder raw materials with the particle size of 4.5 meshes, the plant straws can be one or more of corn straws, bamboo straws, rice straws and wheat straws, and the plant straws in the embodiment are the corn straws, the bamboo straws, the rice straws and the wheat straws according to the weight ratio of 1:1:1:1, mixing;

3) Drying; sending the coarse powder raw material into a drying roller for drying treatment, wherein the drying temperature in the drying roller is 85 ℃, the drying time is 1.5h, and the moisture content of the coarse powder raw material after drying treatment is 30%;

4) Gas-material separation; separating gas and powder from the dried mixture in a cyclone separator;

5) Fine grinding; feeding the powder subjected to gas-material separation into a pulverizer for fine pulverization to obtain a fine powder raw material with the particle size of 16 meshes;

6) And (3) cooling: cooling the finely ground fine powder raw material by adopting a fan;

7) Extrusion molding; sending the cooled fine powder raw material into a rod-making forming agent for carrying out semi-finished product forming processing to obtain a carbon rod, cutting the carbon rod into required length, and heating the carbon rod in the machine at 350 ℃;

8) Carbonizing: and (3) putting the extruded carbon rod into a carbonization furnace, carbonizing at 500 ℃ for 1.2h, and carbonizing at 1000 ℃ for 0.8h.

A high-temperature barbecue charcoal with high calorific value is prepared by the method.

Example 2

A preparation method of high-temperature barbecue charcoal with high calorific value comprises the following steps:

the specific operation steps of the magnetic separation are as follows: a magnetic separator is adopted to remove heavy metals in the gasified fine slag, the magnetic field intensity in the magnetic separation stage is 1T, the heavy metals comprise ferric oxide, titanium oxide, manganese oxide and chromium oxide, the content of the ferric oxide in the gasified fine slag after the magnetic separation treatment is controlled to be below 0.1 percent, and the content of other heavy metals is controlled to be below 0.02 percent;

the specific operation steps of the activation are as follows: feeding the gasified fine slag subjected to magnetic separation into a modified solution according to a material-liquid ratio of 1.

2) Coarse crushing of raw materials: the sawdust, the plant straws and the gasified fine slag subjected to magnetic separation and activation in the step 1) are fed into a pulverizer according to a weight ratio of 1.5: 1:1, mixing;

3) Drying; feeding the coarse powder raw material into a drying roller for drying treatment, wherein the drying temperature in the drying roller is 80 ℃, the drying time is 1h, and the moisture content of the coarse powder raw material after drying treatment is 30%;

5) Fine grinding; feeding the powder subjected to gas-material separation into a pulverizer for fine pulverization to obtain a fine powder raw material with the particle size of 12 meshes;

7) Extrusion molding; sending the cooled fine powder raw material into a rod-making forming agent for carrying out semi-finished product forming processing to obtain a carbon rod, cutting the carbon rod into required length, and heating the carbon rod in the machine at 300 ℃;

8) Carbonizing: and (3) putting the extruded carbon rod into a carbonization furnace, carbonizing at 400 ℃ for 1h, and carbonizing at 600 ℃ for 0.5h.

Example 3

the magnetic separation comprises the following specific operation steps: a magnetic separator is adopted to remove heavy metals in the gasified fine slag, the magnetic field intensity in the magnetic separation stage is 1.5T, the heavy metals comprise ferric oxide, titanium oxide, manganese oxide and chromium oxide, the content of the ferric oxide in the gasified fine slag after the magnetic separation treatment is controlled to be below 0.1 percent, and the content of other heavy metals is controlled to be below 0.02 percent;

the specific operation steps of the activation are as follows: feeding the gasified fine slag subjected to magnetic separation into a modified solution according to the material-liquid ratio of 1: 20, wherein the modified solution consists of potassium permanganate, sodium dodecyl sulfate and water, stirring and reacting for 30min, washing with water, filtering, and drying at the temperature of 60 ℃ for 1h, wherein the concentration of the potassium permanganate is 1g/L, and the concentration of the sodium dodecyl sulfate is 2g/L.

2) Coarse crushing of raw materials: feeding sawdust, plant straws and gasified fine slag subjected to magnetic separation and activation in the step 1) into a pulverizer according to the weight ratio of 1.5;

3) Drying; sending the coarse powder raw material into a drying roller for drying treatment, wherein the drying temperature in the drying roller is 90 ℃, the drying time is 2 hours, and the moisture content of the coarse powder raw material after drying treatment is 30%;

5) Fine grinding; feeding the powder subjected to gas-material separation into a pulverizer for fine pulverization to obtain a fine powder raw material with the particle size of 20 meshes;

7) Extrusion molding; sending the cooled fine powder raw material into a rod-making forming agent for semi-finished product forming processing to obtain a carbon rod, cutting the carbon rod into required length, and heating the carbon rod in the machine at 400 ℃;

8) Carbonizing: and (3) putting the extruded carbon rod into a carbonization furnace, carbonizing at 600 ℃ for 1.5h, and then carbonizing at 1200 ℃ for 1h.

Comparative example 1

This comparative example differs from example 1 in that: the specific operation steps of step 1) and step 2) are not included: sending the sawdust and plant straws into a pulverizer according to the weight ratio of 1:0.5 for coarse pulverization to obtain coarse powder raw materials with the particle size of 4.5 meshes, wherein the plant straws are corn straws, bamboo straws, rice straws and wheat straws according to the weight ratio of 1:1:1:1, mixing; the other steps were the same as in example 1.

Comparative example 2

This comparative example differs from example 1 in that: step 1) raw material pretreatment: magnetic separation of the gasified fine slag: a magnetic separator is adopted to remove heavy metals in the gasified fine slag, the magnetic field intensity in the magnetic separation stage is 1.2T, the heavy metals comprise ferric oxide, titanium oxide, manganese oxide and chromium oxide, the content of the ferric oxide in the gasified fine slag after the magnetic separation treatment is controlled to be below 0.1 percent, and the content of other heavy metals is controlled to be below 0.02 percent; step 2), conveying sawdust, plant straws and gasified fine slag subjected to magnetic separation in the step 1) into a pulverizer according to a weight ratio of 1.5: 1:1:1, mixing; the other steps were the same as in example 1.

Comparative example 3

This comparative example differs from example 1 in that: step 8) carbonizing: and (3) putting the extruded carbon rod into a carbonization furnace, carbonizing at 500 ℃ for 2h, and carbonizing at 1000 ℃ for 0.8h. The other steps were the same as in example 1.

Comparative example 4

This comparative example differs from example 1 in that: step 8) carbonizing: and (3) putting the extruded carbon rod into a carbonization furnace, and carbonizing for 2 hours at the temperature of 1000 ℃. The other steps are the same as in example 1.

The present invention measured the yield, burning time and heat value of the high temperature barbecue charcoal prepared in examples 1-3 and comparative examples 1-4, and the results are shown in the following table, referring to the national standard GB/T17664-1999 to measure the heat value of the high temperature barbecue charcoal:

as can be seen from the above table, the yield of the high-temperature barbecue charcoal prepared by the method of the invention is more than 75%, the burning time is more than 3.5h, the burning heat value is more than 7500kcal/kg, and the yield, the burning time and the burning heat value are all obviously higher than those of comparative examples 1-4, which shows that the preparation method of the invention can obviously improve the yield and the burning performance of the high-temperature barbecue charcoal.

Experimental example 1 influence of the ratio of the modification solution to the gasified fine slag (i.e., the feed-to-liquid ratio of the gasified fine slag to the modification solution) on the specific surface area of the gasified fine slag after activation and on the combustion calorific value and yield of the high-temperature barbecue charcoal.

The present invention also measured the effects of the different ratios (1, 5, 10, 15, 20, 25 and 30) of the modification solution to the gasified fine slag on the specific surface area of the gasified fine slag after activation and on the combustion calorific value and yield of the high-temperature roast carbon by using the method of example 1, and the results are shown in fig. 2 to 4.

As can be seen from figures 2 to 4, when the feed-liquid ratio of the gasified fine slag to the modification solution is 1 ² And when the feed-liquid ratio is 1.

Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A preparation method of high-temperature barbecue charcoal with high calorific value is characterized by comprising the following steps: the method comprises the following steps: 1) Pretreatment of raw materials: magnetic separation and activation of the gasified fine slag; 2) Coarse crushing of raw materials: conveying sawdust, plant straws and gasified fine slag subjected to magnetic separation and activation in the step 1) into a crusher for coarse crushing to obtain coarse powder raw materials with the particle size of 4-5 meshes; 3) Drying; 4) Gas-material separation; 5) Fine grinding; 6) Cooling; 7) Extrusion forming; 8) Carbonizing: the extruded carbon rod is put into a carbonization furnace, carbonized at the temperature of 400-600 ℃ for 1-1.5h and then carbonized at the temperature of 600-1200 ℃ for 0.5-1h.

2. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 1, wherein the method comprises the following steps: the magnetic separation adopts a magnetic separator to remove heavy metals in the gasified fine slag, the magnetic field intensity in the magnetic separation stage is 1-1.5T, the heavy metals comprise ferric oxide, titanium oxide, manganese oxide and chromium oxide, the content of the ferric oxide in the gasified fine slag after the magnetic separation treatment is controlled below 0.1%, and the content of other heavy metals is controlled below 0.02%.

3. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 1, wherein the method comprises the following steps: the specific operation steps of the activation are as follows: and (3) feeding the gasified fine slag subjected to magnetic separation into a modified solution according to the material-liquid ratio of 1-20, wherein the modified solution consists of potassium permanganate, sodium dodecyl sulfate and water, stirring and reacting for 20-30min, washing with water, filtering and drying.

4. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 3, wherein the method comprises the following steps: the concentration of the potassium permanganate is 0.05-1g/L, and the concentration of the sodium dodecyl sulfate is 0.1-2g/L.

5. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 1, wherein the method comprises the following steps: the weight ratio of the sawdust to the plant straws to the gasified fine slag is 1.5.

6. The method for preparing high-temperature barbecue charcoal with high calorific value according to claim 1, wherein the method comprises the following steps: the drying temperature is 80-90 ℃, the drying time is 1-2h, and the moisture content in the dried raw material is 30%.

7. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 1, wherein the method comprises the following steps: the specific operation steps of the step 4) are as follows: and (4) separating gas and powder from the dried mixture in a cyclone separator.

8. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 1, wherein the method comprises the following steps: the specific operation steps of the step 5) are as follows: and (3) feeding the powder after gas-material separation into a pulverizer for fine pulverization to obtain a fine powder raw material with the particle size of 12-20 meshes.

9. The method for preparing high-temperature barbecue charcoal with high calorific value as claimed in claim 8, wherein the method comprises the following steps: the specific operation steps of the step 7) are as follows: and (3) feeding the cooled fine powder raw material into a rod-making forming machine to perform semi-finished product forming processing to obtain the carbon rod, wherein the heating temperature in the machine is 300-400 ℃.

10. A high-temperature barbecue charcoal with high calorific value is characterized in that: prepared by the preparation method according to any one of claims 1 to 9.