CN115873645A - Method for preparing cement kiln biomass alternative fuel from waste plants - Google Patents

Abstract

The invention relates to a method for preparing cement kiln biomass alternative fuel by adopting plants with lower hardness and waste plants with higher combustible value, which compresses and carbonizes branches of waste gas plants for multiple times, then compresses and molds the branches and the branches, greatly reduces the density of the plants, greatly improves the combustible value during combustion, can reduce fly ash, and is suitable for being used as cement kiln fuel; and particularly, a desulfurizer, a denitrifier and a dechlorinating agent for removing potassium ions and chloride ions are arranged, so that the biomass fuel can be conditioned and modified, and pollution and harm caused by combustion of the treated biomass fuel are avoided.

Description

Method for preparing cement kiln biomass alternative fuel from waste plants

Technical Field

The invention relates to the technical field of cement kiln fuels, in particular to a method for preparing a cement kiln biomass alternative fuel from waste plants.

Background

The alternative fuel is also called secondary fuel and auxiliary fuel, and can play a role in replacing part of natural fossil fuel in cement production, and generally comprises the following components: municipal solid waste, municipal sludge, agricultural solid waste (straw, etc.), hazardous waste, waste tires, waste leather, construction waste wood, wood chips, etc. Most of the alternative fuels come from wastes, so that the coal is saved, the wastes are consumed, and the economic and environmental benefits are good. The existing waste gas plants are used for replacing cement kiln biomass to replace fuel, but some plants have lower hardness and slightly lower fuel value, so the waste gas plants are not good choices for replacing fuel, and a new technology for improving the characteristics of the plant fuel is provided.

Disclosure of Invention

The invention solves the technical problems and provides a method for preparing cement kiln biomass alternative fuel by adopting plants with lower hardness and waste plants with higher fuel value.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a method for preparing cement kiln biomass alternative fuel from waste plants comprises the following steps:

s1, collecting branches and roots of waste gas plants, placing the branches and roots, stems and leaves of the waste gas plants on an air-drying rack, drying the branches and the roots, stems and leaves by using hot air in a circulating manner, and removing dust blown by the hot air by using a dust remover to finally enable the water content of the dust to be 20%;

s2, placing the dried branches and the dried roots into a double-roll crusher for primary crushing, placing the primarily crushed branches and the primarily crushed roots into a hot-pressing device for hot pressing, wherein the hot-pressing device is rapidly heated and rapidly cooled within 60 minutes, and pressing by using a continuous roller to form a blank;

s3, placing the blank in a room, and then carbonizing and drying the blank twice, wherein the primary carbonization temperature is 130 ℃, the time is 60 minutes, the primary drying temperature is 72 ℃, the time is 3 days, the secondary carbonization temperature is 100 ℃, the time is 80 minutes, and the secondary drying temperature is 62 ℃, and the time is 1 day;

s4, then putting the powder into a grinder for grinding until the particle size of the powder is less than or equal to 3mm, adding industrial vegetable oil and liquid wax into the powder, and mixing and stirring for 40min;

s5, stirring the powder, a desulfurizing agent, a denitrifying agent and a dechlorinating agent, uniformly stirring, and carrying out microwave treatment and drying to ensure that the water content is 1-5%;

and S6, adding high clay, quickly stirring for 5 minutes to obtain a mixed material, and moving the mixed material to a forming die or equipment for extrusion forming to obtain the granular fuel.

Further, in step S2, the pre-pressing pressure is 2.0MPa, and the pre-pressing time is 10min.

Further, the plant is a mixed type plant of trees, shrubs and vines.

Further, the desulfurizing agent, the denitrifying agent and the dechlorinating agent are according to 1.

Further, the industrial vegetable oil and the liquid wax are taken in the step S4 and are added into the mixture to be mixed and stirred at the temperature of 60-80 ℃.

The invention has the following advantages: the branches of the waste gas plants are compressed and carbonized for multiple times and then compressed and molded, so that the density of the plants is greatly reduced, the combustion value is greatly improved during combustion, the fly ash can be reduced, and the waste gas plant is suitable for being used as cement kiln fuel; and the desulfurizer, the denitrifier and the dechlorinating agent for removing potassium ions and chloride ions are particularly arranged, so that the biomass fuel can be conditioned and modified, and pollution and harm caused by combustion of the treated biomass fuel are avoided.

Drawings

FIG. 1 is a schematic structural diagram of a method for preparing cement kiln biomass alternative fuel by waste plants.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

With reference to the attached drawing 1, the method for preparing the cement kiln biomass alternative fuel by using the waste plants comprises the following steps:

s1, collecting branches and roots of waste gas plants, placing the branches, roots, stems and leaves on an airing rack, circularly airing by using hot air, and removing dust blown by the hot air by using a dust remover to finally enable the water content of the branches, the roots, the stems and the leaves to be 20%;

s2, placing the dried branches and the dried roots into a double-roll crusher for primary crushing, placing the primarily crushed branches and the primarily crushed roots into a hot pressing device for hot pressing, wherein the hot pressing device is rapidly heated and rapidly cooled within 60 minutes, the prepressing pressure is 2.0MPa, and the prepressing time is 10min; pressing by a continuous roller to form a blank, and simultaneously, the hot pressing at high temperature can kill ova and bacteria on the stems and the roots of the plants;

s3, placing the blank in a room, and then carbonizing and drying the blank twice, wherein the primary carbonization temperature is 130 ℃, the time is 60 minutes, the primary drying temperature is 72 ℃, the time is 3 days, the secondary carbonization temperature is 100 ℃, the time is 80 minutes, and the secondary drying temperature is 62 ℃, and the time is 1 day;

s4, then putting the mixture into a grinder, grinding the mixture until the particle size of the powder is less than or equal to 3mm, adding industrial vegetable oil and liquid wax into the mixture, mixing and stirring the mixture for 40min, mixing and stirring the mixture at 60-80 ℃ to ensure that the water content of the fuel is low and the fuel is fully combusted;

s5, stirring the powder, a desulfurizing agent, a denitrifying agent and a dechlorinating agent, wherein the desulfurizing agent, the denitrifying agent and the dechlorinating agent are mixed according to the ratio of 1; after being uniformly stirred, the mixture is dried by microwave treatment, so that the water content is 1-5%, and chlorine-containing waste gas generated by combustion is less;

and S6, adding high clay, quickly stirring for 5 minutes to obtain a mixed material, and moving the mixed material to a forming die or equipment for extrusion forming to obtain the granular fuel.

Preferably, the plant is a mixed plant of plants with higher density, such as trees, shrubs, vines, wood chips, straws, corncobs and the like.

When the method is specifically implemented, branches of the waste gas plants are subjected to cold pressing, hot pressing, compression and carbonization for multiple times, and then are subjected to compression molding, so that the prepared finished product is compact in particle, not loose and convenient to store, and the raw materials are renewable energy sources, so that the method has the characteristics of energy conservation, environmental friendliness, high heat productivity and no coking, and is suitable for being used as cement kiln fuel; and particularly, a desulfurizer, a denitrifier and a dechlorinating agent for removing potassium ions and chloride ions are arranged, so that the biomass fuel can be conditioned and modified, and pollution and harm caused by combustion of the treated biomass fuel are avoided.

The invention and its embodiments have been described above without limitation to the details of construction and practice. In summary, those skilled in the art should be able to conceive of the present invention without creative design of the similar structural modes and embodiments without departing from the spirit of the present invention, and all such modifications should fall within the protection scope of the present invention.

Claims (5)

1. A method for preparing cement kiln biomass alternative fuel by waste plants is characterized by comprising the following steps: the method comprises the following steps:

s1, collecting branches and roots of waste gas plants, placing the branches and roots, stems and leaves of the waste gas plants on an air-drying rack, drying the branches and the roots, stems and leaves by using hot air in a circulating manner, and removing dust blown by the hot air by using a dust remover to finally enable the water content of the dust to be 20%;

s2, placing the dried branches and the dried roots into a double-roll crusher for primary crushing, placing the primarily crushed branches and the primarily crushed roots into a hot-pressing device for hot pressing, wherein the hot-pressing device is rapidly heated and rapidly cooled within 60 minutes, and pressing by using a continuous roller to form a blank;

s3, placing the blank in a room, and then carbonizing and drying the blank twice, wherein the primary carbonization temperature is 130 ℃, the time is 60 minutes, the primary drying temperature is 72 ℃, the time is 3 days, the secondary carbonization temperature is 100 ℃, the time is 80 minutes, and the secondary drying temperature is 62 ℃, and the time is 1 day;

s4, then putting the powder into a grinder, grinding the powder until the particle size of the powder is less than or equal to 3mm, adding industrial vegetable oil and liquid wax into the powder, and mixing and stirring the mixture for 40min;

s5, stirring the powder, a desulfurizing agent, a denitrifying agent and a dechlorinating agent, uniformly stirring, and carrying out microwave treatment and drying to ensure that the water content is 1-5%;

and S6, adding high clay, quickly stirring for 5 minutes to obtain a mixed material, and moving the mixed material to a forming die or equipment for extrusion forming to obtain the granular fuel.

2. The method for preparing the cement kiln biomass alternative fuel from the waste plants as claimed in claim 1, is characterized in that: in step S2, the pre-pressing pressure is 2.0MPa, and the pre-pressing time is 10min.

3. The method for preparing the cement kiln biomass alternative fuel from the waste plants as claimed in claim 1, is characterized in that: the plant is mixed plant of tree, shrub and vine.

4. The method for preparing the cement kiln biomass alternative fuel from the waste plants as claimed in claim 1, is characterized in that: the desulfurizing agent, the denitrifying agent and the dechlorinating agent are in the following ratio of 1.

5. The method for preparing the cement kiln biomass alternative fuel from the waste plants as claimed in claim 1, is characterized in that: and in the step S4, the industrial vegetable oil and the liquid wax are added into the mixture and mixed and stirred at the temperature of 60-80 ℃.

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