CN112538392A - Smoldering smokeless medium-high temperature ignition charcoal and preparation method thereof - Google Patents
Smoldering smokeless medium-high temperature ignition charcoal and preparation method thereof Download PDFInfo
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- CN112538392A CN112538392A CN202011411326.5A CN202011411326A CN112538392A CN 112538392 A CN112538392 A CN 112538392A CN 202011411326 A CN202011411326 A CN 202011411326A CN 112538392 A CN112538392 A CN 112538392A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L11/00—Manufacture of firelighters
- C10L11/04—Manufacture of firelighters consisting of combustible material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2230/00—Function and purpose of a components of a fuel or the composition as a whole
- C10L2230/22—Function and purpose of a components of a fuel or the composition as a whole for improving fuel economy or fuel efficiency
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/24—Mixing, stirring of fuel components
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/32—Molding or moulds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention relates to smoldering smokeless and medium-high temperature ignition carbon, which contains carbon powder, a combustion improver, a smoke suppressor and an adhesive; the carbon powder is formed by mixing semi-coke powder and charcoal carbon powder; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide; the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the adhesive is one or a composition of more of pregelatinized starch, CMC and dextrin. The smoldering smokeless and medium-high temperature ignition carbon of the invention is tested by ignition: the smoldering smokeless ignition carbon is ignited within 3 seconds, the whole ignition carbon is ignited within 15 seconds, and the ignition carbon has no open fire and no smoke stain in the whole combustion process. The ignition carbon prepared by the method belongs to a medium-high temperature type carbon product, has no open fire when being combusted, is safer and safer compared with open fire combustion, has no smoke stains when being combusted by adding an auxiliary agent, has no harm to human bodies when being combusted, and is environment-friendly and healthy.
Description
Technical Field
The invention relates to the technical field of ignition carbon, in particular to smoldering smokeless middle-high temperature ignition carbon and a preparation method thereof.
Background
At present, common ignition carbon mainly burns by open fire, and has the problems of too high burning rate, too short burning time and too low temperature in the burning process. For example, CN105695037A provides a method for preparing a smoke-eliminating combustion-supporting ignition carbon rod, which is prepared from carbon powder, sawdust, semi-refined paraffin, light calcium carbonate, potassium permanganate, potassium chlorate, sodium chloride, polyvinyl alcohol, sodium humate, clear water and the like. Potassium permanganate and potassium chlorate are strong oxidizers, and can release a large amount of oxygen at the temperature of 200 ℃ or above 400 ℃, so that the combustion temperature is increased, and the complete combustion of volatile matters is promoted, thereby reducing the generation of smoke. Light calcium carbonate is used for combustion supporting, sodium chloride is used for combustion supporting, and chemical reaction is kept stable. It can be seen that the pyrophoric carbon of the art is also open flame combustion, which promotes the completion of the combustion reaction to reduce the amount of smoke mainly by increasing the temperature by adding a large amount of oxidant, but this practice, although increasing the reaction temperature, further aggravates the combustion and results in too short a combustion time of the pyrophoric carbon.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a smoldering smokeless, medium-high temperature pyrophoric charcoal and a preparation method thereof, which solves the problems of open-fire combustion, too short combustion time and obvious smoke generation of the existing pyrophoric charcoal.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
on one hand, the invention provides smoldering smokeless and medium-high temperature ignition carbon, which contains carbon powder, a combustion improver, a smoke suppressor and an adhesive; the carbon powder is formed by mixing semi-coke powder and charcoal carbon powder; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide; the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the adhesive is one or a composition of more of pregelatinized starch, CMC and dextrin.
On the other hand, the invention provides smoldering smokeless medium-high temperature ignition carbon and a preparation method thereof, wherein the method comprises the following steps: taking a carbon powder mixture of semi-coke and charcoal as a carbon raw material, adding a binder, a combustion improver, a smoke suppressor and water, stirring and mixing to prepare carbon mud, then forming a blank body from the carbon mud by adopting any one of spiral extrusion, stamping and roll forming, and drying the blank body to prepare smoldering smokeless middle-high temperature ignition carbon; wherein the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide.
According to a preferred embodiment of the present invention, the binder is one or a combination of pregelatinized starch, CMC and dextrin, or a mixture of pregelatinized starch as a main component and CMC or dextrin or other binders as additives.
According to a preferred embodiment of the present invention, the amount of water is 25-40% of the mass of the carbon powder mixture.
According to a preferred embodiment of the present invention, wherein the binder is pregelatinized corn starch.
According to a preferred embodiment of the present invention, in the carbon powder mixture, the mass ratio of the semi-coke to the charcoal is 1:1 to 2, preferably 1: 1.
According to a preferred embodiment of the present invention, wherein the particle size of the carbon powder mixture is 70-100 mesh.
According to a preferred embodiment of the invention, the charcoal is one or a mixture of more of apple charcoal, jujube wood charcoal, lychee charcoal, bamboo charcoal and chrysanthemum charcoal.
According to a preferred embodiment of the present invention, the preparation method comprises the steps of:
s1, grinding the semi-coke and the charcoal, and sieving to obtain a carbon powder mixture of the semi-coke and the charcoal with the particle size of 70-100 meshes;
s2, dissolving the combustion improver and the smoke suppressor in a certain mass ratio in water, and stirring to obtain a water-containing material;
wherein the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide;
s3, taking the carbon powder mixture and the binder, stirring and mixing according to the mass ratio of 50-60:1-5, adding the water-containing material prepared in the step S2, and continuously stirring and mixing until the mixture is uniform to obtain carbon mud; the binder is one or a composition of more of pregelatinized starch, CMC and dextrin;
s4: and (3) forming the carbon mud into a blank body by adopting any one of spiral extrusion, stamping and roll forming, and drying the blank body to obtain the smoldering smokeless middle-high temperature ignition carbon.
According to a preferred embodiment of the present invention, wherein the carbon powder mixture: adhesive: combustion improver: smoke suppressor: the water mass ratio is 50-60:1-5:1-4:1-5: 25-40.
According to the preferred embodiment of the present invention, in step S4, a prismatic, cylindrical or thumb-shaped blank is prepared by using a spiral extrusion molding method; preparing a cylindrical or prismatic blank by adopting a punch forming mode; and preparing an ellipsoidal, heart-like or pentagram-shaped blank by adopting double-roll forming.
According to the preferred embodiment of the present invention, in step S4, the drying temperature is 50-80 ℃ for 3-5 hours.
According to a preferred embodiment of the invention, in step S1, the mass ratio of the semi-coke to the charcoal is 1: 1-2, preferably 1: 1.
(III) advantageous effects
(1) The invention selects semi-coke and charcoal to grind into carbon powder mixture according to proportion, adds combustion improver, smoke suppressor, adhesive and water to make into carbon mud, then adopts the modes of screw extrusion, punching and double-roll forming to make into blank body with specific shape and size, then dries to make into smoldering smokeless, middle-high temperature ignition carbon, tests by ignition: the smoldering smokeless ignition carbon is ignited within 3 seconds, the whole ignition carbon is ignited within 15 seconds, and the ignition carbon has no open fire and no smoke stain in the whole combustion process.
(2) In the prior art, a strong oxidant is mainly used as a combustion improver to improve the combustion temperature, promote the complete combustion of volatile matters and reduce the smoke yield. However, this method still belongs to open fire combustion in spite of the smoke amount, and the combustion time of the ignition coal is too short due to the over-intense combustion caused by adding a large amount of combustion improver. In addition, some technologies use potassium nitrate and red phosphorus as combustion promoters, and potassium nitrate is easily deliquesced, and the deliquescence and red phosphorus form a "smoking material", which also causes a problem of increased smoke generation.
(3) The smoke suppressor of the invention mainly uses aluminum hydroxide, and the aluminum hydroxide as the smoke suppressor not only has the function of controlling the burning rate, but also can prevent smoke generation, does not produce drippings and does not produce toxic gas.
(4) The semi-coke and the charcoal are mixed for use, so that the production cost of the charcoal can be reduced, and the stacking density of the charcoal and the semi-coke can be improved (the stacking density is increased) so as to solve the problem that the burning time of the existing ignition charcoal is too short.
The semi coke is a solid byproduct obtained by taking weak-viscosity coal and long-flame coal as raw materials, performing dry distillation carbonization at a medium-low temperature (500-. In recent years, the actual yield of the semi coke is about 2500 ten thousand tons/year, and the price of the semi coke is between 650 and 800 yuan. The semi-coke has the characteristics of high fixed carbon, high heat value, high chemical activity, low ash content, low aluminum, low volatile content, low sulfur and low phosphorus, has the characteristic of a certain amount of porosity, can be widely applied to the preparation of energy supply materials and adsorption materials, and is a carbon material with high added value. Therefore, the semi-coke and the charcoal are mixed to prepare the pyrophoric carbon, and the common advantages of the two raw materials can be integrated. The method can save forest resources, reduce tree felling, clean use of coal chemical by-product semi-coke, and reduce the pollution and high energy consumption problems of the environment caused by the discharge of by-products in the charcoal production process.
(5) The semi-coke has a certain specific surface area and a microporous structure, can be used for flue gas adsorption, not only has the physical adsorption advantage of charcoal, but also has oxygen-containing functional groups such as carbonyl, hydroxyl and the like on the surface of the semi-coke, which are beneficial to the chemical adsorption of the flue gas in the combustion process.
(6) The ignition carbon prepared by the method belongs to a medium-high temperature type carbon product, has no open fire when being combusted, is safer than open fire combustion, has no smoke stains in the combustion process of the added auxiliary agent, has no harm to human bodies due to ash content after being combusted, and is environment-friendly and healthy.
(7) The invention takes hydrogen peroxide, potassium permanganate or chloroformic acid and the like as combustion improvers, aluminium hydroxide as a smoke suppressor, and products after combustion mainly comprise sodium chloride, water and aluminium oxide, thus being environment-friendly and healthy to human bodies; and nitrogen oxides, sulfur oxides, and nuclear mode and accumulation mode particles are not generated in the combustion process of the auxiliary agent.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail below with reference to specific embodiments.
Example 1
S1, mixing 1Kg of semi-coke and 1Kg of charcoal, grinding, sieving, grinding the oversize part again, sieving to obtain 2.0Kg of charcoal powder mixture of semi-coke and charcoal with the particle size of 100 meshes.
S2, dissolving 50g of potassium chlorate, 30g of potassium permanganate and 60g of aluminum hydroxide in 1Kg of water, and stirring to obtain a water-containing material.
And S3, taking the carbon powder mixture and the pre-gelatinized corn starch, stirring and mixing for 30min according to the mass ratio of 50:2, adding the water-containing material prepared in the step S2, and continuously stirring and mixing uniformly to obtain carbon mud.
S4: preparing a cylindrical blank body from the carbon mud by adopting a spiral extrusion forming mode, drying for 4 hours at 50 ℃ to obtain a smoldering smokeless and medium-high temperature ignition carbon product (with the diameter of 30mm and the length of 100mm), and sealing and packaging.
Example 2
S1, mixing 1Kg of semi-coke and 2Kg of charcoal, grinding, sieving, grinding the oversize part again, sieving to obtain 3.0Kg of charcoal powder mixture of semi-coke and charcoal with the particle size of 100 meshes.
S2, dissolving 100g of potassium chlorate, 50g of potassium permanganate and 100g of aluminum hydroxide in 1.5Kg of water, and stirring to obtain a water-containing material.
And S3, taking the carbon powder mixture and CMC according to the mass ratio of 50:2.5, stirring and mixing for 30min, adding the water-containing material prepared in the step S2, and continuously stirring and mixing until the mixture is uniform to obtain carbon mud.
S4: the carbon mud is made into a prismatic blank by adopting a stamping forming mode, and is dried for 4 hours at the temperature of 50 ℃ to obtain a smoldering smokeless and medium-high temperature ignition carbon product (with the diameter of 30mm and the length of 100mm), and the product is sealed and packaged.
Example 3
S1, mixing 1Kg of semi-coke and 2Kg of charcoal, grinding, sieving, grinding the oversize part again, sieving to obtain 3.0Kg of charcoal powder mixture of semi-coke and charcoal with the particle size of 100 meshes.
S2, dissolving 100g of 50% hydrogen peroxide, 100g of potassium permanganate and 100g of aluminum hydroxide in 1.5Kg of water, and stirring to obtain the water-containing material.
And S3, taking the carbon powder mixture and dextrin, stirring and mixing for 30min according to the mass ratio of 50:3, adding the water-containing material prepared in the step S2, and continuously stirring and mixing until the mixture is uniform to obtain carbon mud.
S4: the carbon mud is made into a prismatic blank by adopting a stamping forming mode, and is dried for 4 hours at the temperature of 60 ℃ to obtain a smoldering smokeless and medium-high temperature ignition carbon product (with the diameter of 30mm and the length of 100mm), and the product is sealed and packaged.
The pyrophoric carbon products prepared in examples 1-3 were tested for performance and the results are given in the following table:
the detection methods of the items in the table are carried out according to the measurement methods specified in the national standards, namely the industrial analysis method of GB/T212 coal, the calorific value measurement method of GB/T213 coal, the measurement method of total sulfur in GB/T214 coal, the preparation method of GB/T474 coal sample and the GB/T483 coal analysis test method are generally specified.
The calorific value of the ignition carbon product is more than or equal to 5736Kcal/Kg, the total sulfur is less than or equal to 0.50, and the ignition carbon product meets the technical requirements of GB34170-2017 commercial coal quality-molded coal No. 1 in civil molded coal, and shows that the ignition carbon has high heat radiated to the outside in the combustion process and is beneficial to igniting other carbon products. The higher volatile content of the dry base indicates that the pyrophoric carbon is more easily ignited. The dry base ash is mainly composed of inorganic matters in the carbon mixture, and the content is low, which shows that the ash after the ignition carbon is burnt is less, the container opening is not easy to block, and the coking of combustion equipment can be reduced to a certain extent.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A smoldering smokeless and medium-high temperature ignition carbon is characterized in that the ignition carbon contains carbon powder, a combustion improver, a smoke suppressor and an adhesive; the carbon powder is formed by mixing semi-coke powder and charcoal carbon powder; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide; the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the adhesive is one or a composition of more of pregelatinized starch, CMC and dextrin.
2. A smoldering smokeless and medium-high temperature ignition carbon and a preparation method thereof are characterized in that the method comprises the following steps: taking a carbon powder mixture of semi-coke and charcoal as a carbon raw material, adding a binder, a combustion improver, a smoke suppressor and water, stirring and mixing to prepare carbon mud, then forming a blank body from the carbon mud by adopting any one of spiral extrusion, stamping and roll forming, and drying the blank body to prepare smoldering smokeless middle-high temperature ignition carbon; wherein the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide.
3. The preparation method of claim 2, wherein the binder is one or more of pregelatinized starch, CMC and dextrin, or a mixture of pregelatinized starch as a main component and CMC, dextrin or other binders as additives.
4. The method according to claim 2, wherein the amount of water is 25-40% of the amount of the carbon powder mixture.
5. The preparation method of claim 2, wherein the mass ratio of the semi-coke to the charcoal in the carbon powder mixture is 1: 1-2.
6. The method of claim 2, wherein the carbon powder mixture has a particle size of 70-100 mesh.
7. The preparation method according to claim 2, wherein the charcoal is one or more selected from apple charcoal, date wood charcoal, lychee charcoal, bamboo charcoal and chrysanthemum charcoal.
8. The method of claim 2, comprising the steps of:
s1, grinding the semi-coke and the charcoal, and sieving to obtain a carbon powder mixture of the semi-coke and the charcoal with the particle size of 70-100 meshes;
s2, dissolving the combustion improver and the smoke suppressor in a certain mass ratio in water, and stirring to obtain a water-containing material;
wherein the combustion improver is one or a mixture of more of hydrogen peroxide, manganese dioxide and potassium perchlorate; the smoke suppressor is aluminum hydroxide or a smoke suppressor composition containing aluminum hydroxide;
s3, taking the carbon powder mixture and the binder, stirring and mixing according to the mass ratio of 50-60:1-5, adding the water-containing material prepared in the step S2, and continuously stirring and mixing until the mixture is uniform to obtain carbon mud; the binder is one or a composition of more of pregelatinized starch, CMC and dextrin;
s4: and (3) forming the carbon mud into a blank body by adopting any one of spiral extrusion, stamping and roll forming, and drying the blank body to obtain the smoldering smokeless middle-high temperature ignition carbon.
According to a preferred embodiment of the present invention, wherein the carbon powder mixture: adhesive: combustion improver: smoke suppressor: the water mass ratio is 50-60:1-5:1-4:1-5: 25-40.
9. The method of claim 8, wherein in step S4, a prismatic, cylindrical or thumb-shaped blank is prepared by screw extrusion; preparing a cylindrical or prismatic blank by adopting a punch forming mode; and preparing an ellipsoidal, heart-like or pentagram-shaped blank by adopting double-roll forming.
10. The preparation method according to claim 8, wherein in step S1, the semi-coke and the charcoal are mixed at a mass ratio of 1: 1-2; in step S4, the dried product is dried for 3-5 hours at the drying temperature of 50-80 ℃.
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| CN87216403U (en) * | 1987-12-21 | 1988-07-20 | 刘志星 | Firing charcoal |
| CN1058227A (en) * | 1991-08-23 | 1992-01-29 | 沈阳市三明应用技术研究所 | The making method of touch charcoal |
| FR2711668A1 (en) * | 1993-10-26 | 1995-05-05 | Poudres & Explosifs Ste Nale | Solid fuel material. Firelighters. Manufacturing process. |
| CN103540380A (en) * | 2013-07-22 | 2014-01-29 | 方新成 | Refuse-derived fuel for smoldering furnace |
| CN105695037A (en) * | 2014-11-26 | 2016-06-22 | 罗福仲 | Smoke-abating combustion-supporting igniting carbon rod and preparation method thereof |
| CN111996057A (en) * | 2020-08-31 | 2020-11-27 | 陕西煤业星炭能源有限公司 | Preparation method of roasted tea charcoal for tea baking |
-
2020
- 2020-12-03 CN CN202011411326.5A patent/CN112538392A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87216403U (en) * | 1987-12-21 | 1988-07-20 | 刘志星 | Firing charcoal |
| CN1058227A (en) * | 1991-08-23 | 1992-01-29 | 沈阳市三明应用技术研究所 | The making method of touch charcoal |
| FR2711668A1 (en) * | 1993-10-26 | 1995-05-05 | Poudres & Explosifs Ste Nale | Solid fuel material. Firelighters. Manufacturing process. |
| CN103540380A (en) * | 2013-07-22 | 2014-01-29 | 方新成 | Refuse-derived fuel for smoldering furnace |
| CN105695037A (en) * | 2014-11-26 | 2016-06-22 | 罗福仲 | Smoke-abating combustion-supporting igniting carbon rod and preparation method thereof |
| CN111996057A (en) * | 2020-08-31 | 2020-11-27 | 陕西煤业星炭能源有限公司 | Preparation method of roasted tea charcoal for tea baking |
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Application publication date: 20210323 |