KR102354455B1 - Method for producing pellets for fuel using mushroom waste media - Google Patents

Abstract

The present invention provides a method for producing pellets for fuel using a mushroom waste medium, including drying, forming formulations containing additives, drying formulations, primary molding and secondary molding to produce environmentally friendly pellets for fuel with excellent calorific value by using a large amount of waste medium that is discarded after being used for culturing various kinds of mushrooms. Accordingly, the present invention maximizes reusability, can greatly contribute to energy saving due to high calorific value over a stable period of time, and has high utility value as new renewable energy.

Description

Method for producing pellets for fuel using mushroom waste media {Method for producing pellets for fuel using mushroom waste media}

The present invention relates to a method for producing pellets for fuel, and more particularly, using a mushroom waste medium for producing pellets for fuel that is eco-friendly and has excellent calorific value by using a large amount of waste medium discarded after being used for culturing various kinds of mushrooms. It relates to a method for manufacturing pellets for fuel.

In general, although the waste medium after culturing various types of mushrooms has a high re-use value as a fuel, it is common to use most of them only as an additive to be mixed in fertilizer or compost production. Alternatively, it is mixed with the contents for diluting the salt concentration during food treatment and used as feed, but it has a disadvantage in that it is difficult to digest and absorb, so that it is not realistic.

In addition, mushroom production has steadily increased in the era of well-being, and the production of waste media in Korea alone in 2011 was 1,500,000 tons.

The present invention provides a technique for using the waste medium of the above enormous amount of mushrooms as pellets for fuel.

In the prior art that utilizes the above-mentioned waste medium of mushrooms to be used as fuel, Korean Patent Publication No. 10-1609696, Republic of Korea Patent Publication No. 10-1728233, Republic of Korea Patent Publication No. 10-1953361, Republic of Korea It has been published in Korean Patent Publication No. 10-2078958 (hereinafter referred to as 'prior art documents').

Republic of Korea Patent Publication No. 10-1609696 Republic of Korea Patent Publication No. 10-1728233 Republic of Korea Patent Publication No. 10-1953361 Republic of Korea Patent Publication No. 10-2078958

A specific technical solution of the present invention for solving the various problems of the prior art is a method for producing pellets for fuel that is eco-friendly and has excellent calorific value by using a large amount of waste media that is discarded after being used for culturing various kinds of mushrooms. is to provide

Another specific technical problem of the present invention is to enable it to have an even better calorific value.

The present invention comprises the steps of drying the mushroom waste medium to a moisture content of 20% by weight or less in a dryer through a foreign material removal process; A mixing step of mixing 100 to 200 parts by weight of the dried mushroom waste medium and 50 to 100 parts by weight of an additive in a mixer to form a mixture; Drying step of drying the formulation to a water content of 2 wt% or less by hot air heating while stirring after processing the formulation in a powder form; a primary molding step of putting the dried compound into a molding machine and drying and molding it using compression heat and friction heat generated through the compression process to form primary pellets; and a secondary molding step of putting the primary pellets into a molding machine and drying and molding using compression heat and frictional heat generated through a high-pressure compression process to form secondary pellets; provide a way

In addition, the additive is a first additive comprising at least one selected from the group consisting of charcoal, activated carbon, and combinations thereof, dried sludge, dried coffee sludge powder, and a first additive comprising at least one selected from the group consisting of a combination thereof 2 It is characterized in that it comprises a third additive including at least one selected from the group consisting of additives, adhesives, lignin, and combinations thereof.

In addition, the additive is characterized in that it contains the first additive, the second additive, and the third additive in a weight ratio of 1:0.2 to 0.8:0.2 to 0.8.

In addition, the mixing step is a step of mixing 120 to 170 parts by weight of the dried mushroom waste medium and 70 to 90 parts by weight of the additive, and the additive is a first additive, a second additive, and a third additive 1:0.4 ~ It is characterized in that it is included in a weight ratio of 0.6:0.4 to 0.6.

The present invention provides a method for producing pellets for fuel that is eco-friendly and has excellent calorific value using a large amount of waste media that is discarded after being used for culturing various kinds of mushrooms, stably with the effect of maximizing reusability It not only has an effect that can greatly contribute to energy saving due to the high calorific value for a long time, but also has a high utility value as a new and renewable energy.

In addition, by allowing it to have an even more excellent calorific value, it also has an effect of providing excellent thermal power.

1 is a block diagram for explaining the process of manufacturing pellets for fuel using the mushroom waste medium of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, and the present invention is not limited or limited by the embodiments.

1 is a block diagram for explaining the process of manufacturing pellets for fuel using the mushroom waste medium of the present invention.

As shown, a technology capable of manufacturing pellets that can be used as fuel for combustion in each field is prepared using a large amount of mushroom waste medium with high reuse value as a fuel, as described in the background technology of the invention.

An object of the present invention is to provide a fuel pellet manufacturing method comprising a mushroom waste medium for producing eco-friendly and excellent calorific value pellets using a large amount of waste medium discarded after being used for culturing various kinds of mushrooms.

A preferred embodiment of producing pellets for fuel using the mushroom waste medium according to the present invention is as follows.

First, a plurality of removal bars are provided on the outer surface of a sieve or a rotating drum in the process of transporting various foreign substances, vinyl, tree branches, iron, etc., contained in the collected mushroom waste medium by a conventional conveyor belt to remove foreign substances or Remove foreign substances using a magnetic separator, etc.

Mushroom waste media also contains a lot of moisture from mushroom cultivation, so in the process of transferring the waste mushroom media from which foreign substances have been removed to a conventional conveyor belt, it is dried by supplying hot air or by supplying hot air from a drum-type dryer to provide moisture content. A step of drying to 20% by weight or less is performed.

When direct heat is applied to drying the mushroom waste medium, it is preferable to dry the mushroom waste medium with hot air, which is indirect heat, since the mushroom waste medium may be carbonized. In order to lower the moisture content, a general input including drying, for example, may be mixed with an input such as a solid or sawdust to lower the moisture content. These inputs can further improve the formability and combustion efficiency in pellet manufacturing.

In the above, drying the moisture of the mushroom waste medium to 20% by weight or less takes into account the moisture content when mixing with other additives while preventing the moldability of the pellet form from being deteriorated when the moisture content is high.

Then, a mixing step of mixing the dried mushroom waste medium and additives in a mixer to form a mixture is performed.

The additive includes a first additive including at least one selected from the group consisting of charcoal, activated carbon, and combinations thereof, and a second additive including at least one selected from the group consisting of dried sludge, dried coffee sludge powder, and combinations thereof. and a third additive including at least one selected from the group consisting of additives, adhesives, lignin, and combinations thereof.

The ligrin refers to a fat-soluble phenolic polymer among various constituents constituting the wood part such as conifers or broadleaf trees, and has heterogeneous and amorphous characteristics. Therefore, when the lignin is used alone among the third additives, the strength and calorific value of the pellets can be controlled without a separate adhesive and additives by controlling the added content. The lignin more specifically includes sodium lignosulfonate or calcium lignosulfonate.

In the above, the additive serves to enhance the formability of the formulation as well as to reinforce the strength and, in particular, to enhance the calorific value during combustion after being finally molded into the second pellet, so that it can have excellent calorific value as well as excellent combustion efficiency.

The mixing step in the above is a step of mixing 100 to 200 parts by weight of the dried mushroom waste medium and 50 to 100 parts by weight of the additive in a mixer to form a mixture. The additive includes the first additive, the second additive, and the third additive in a weight ratio of 1:0.2 to 0.8:0.2 to 0.8.

Preferably, 120 to 170 parts by weight of the dried mushroom waste medium and 70 to 90 parts by weight of the additive are mixed, and the additive includes the first additive, the second additive and the third additive from 1:0.4 to 0.6:0.4 to It is preferable to include it in a weight ratio of 0.6.

The above-mentioned weight ratio is in order to ensure that the produced pellets have an excellent calorific value measured during combustion, and refer to the calorific value measured through Examples and Comparative Examples to be described later.

Then, after processing the compound in a powder form for molding in a conventional grinder, a drying step of drying the compound to a moisture content of 2% by weight or less by hot air heating while stirring is performed.

In the above, processing the formulation into powder form is to facilitate handling as well as logistics with excellent moldability during pellet molding.

In addition, the drying while stirring the mixture is to have a moisture content of 2% by weight or less so that it can be dried quickly within a short time, and to have excellent moldability due to being processed into a powder form.

This is to minimize the moisture content as much as possible immediately before molding into pellets, and when there is no moisture completely, it contains a small amount of moisture as the moldability deteriorates.

Next, the process for forming into pellets is divided into primary and secondary.

First, the dried compound is put into a molding machine and dried and molded using heat of compression and friction heat of 100 to 130° C. generated through the compression process to perform a primary molding step of forming primary pellets.

This primary forming step is a primary temporary forming process for forming pellets, and some moisture contained in the formulation is evaporated while taking the shape of a pellet. At this time, the primary molded pellets are softer than secondary molded pellets to be described later.

In this way, when the primary pellets are molded, the primary pellets are put back into the molding machine and dried and molded using the compression heat and friction heat of 130 to 160° C. generated through the high-pressure compression process to form secondary pellets. includes steps.

In the above, the secondary pellets can be used immediately for fuel, and are drier than the primary pellets to prevent cracks or breakage during handling, and have high strength due to high cohesion.

In particular, as the air in the mixture of the primary pellets is completely exhausted by compression at high pressure at 160° C., that is, the secondary pellets are molded to have a high density, so that the combustion can be made stably for a long time.

<Examples and Comparative Examples>

First, the mushroom waste medium was dried to a moisture content of 20% by weight or less after going through a foreign material removal process, and then blended into a formulation as shown in Table 1 below. After processing this formulation in a powder form in a pulverizer, the mixture was dried to a moisture content of 2 wt% or less by hot air heating while stirring, and the dried formulation was first molded and secondary molded to prepare pellets.

(Unit: kg) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 dried mushroom waste medium 100 120 170 200 90 210 150 additive charcoal 32 20 - - 10 - 10 activated carbon - 20 40 48 10 20 10 dry sludge 3.2 - 9.6 - - 4.8 10 dry coffee sludge powder 3.2 20 10.4 32 10 5.2 10 glue 12.8 - 9.6 - 10 4.8 10 Sodium lignosulfonate 6.4 10 5.2 16 - 5.2 10 Calcium lignosulfonate 6.4 10 5.2

<Measurement of calorific value>

The calorific value and exothermic time per unit weight of the pellets prepared according to the Examples and Comparative Examples were measured.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Calorific value (kcal/kg) 4602 4885 4913 4218 3965 3910 4011 Heating time (hr) 11 12 12 11 10 10 8

As shown in Table 2, it can be seen that the pellets according to Examples have a higher calorific value and a longer exothermic time than Comparative Examples, and in particular, it can be confirmed that the calorific value and exothermic time of the pellets according to Examples 2 and 3 are excellent.

Accordingly, the present invention can provide a pellet having an excellent calorific value using a mushroom waste medium without going through a complicated process.

Claims (2)

drying the mushroom waste medium to a moisture content of 20% by weight or less in a dryer through a process of removing foreign substances;
A mixing step of mixing 100 to 200 parts by weight of the dried mushroom waste medium and 50 to 100 parts by weight of an additive in a mixer to form a mixture;
a drying step of drying the mixture to a moisture content of 2 wt% or less by heating with hot air while processing the mixture in a powder form in a grinder;
a primary molding step of putting the dried compound into a molding machine and drying and molding it using compression heat and friction heat generated through the compression process to form primary pellets; and
A secondary molding step of putting the primary pellets into a molding machine and drying and molding them using compression heat and friction heat generated through a high-pressure compression process to form secondary pellets;
The additive includes a first additive including at least one selected from the group consisting of charcoal, activated carbon, and combinations thereof, and a second additive including at least one selected from the group consisting of dried sludge, dried coffee sludge powder, and combinations thereof. an additive and a third additive comprising lignin;
The lignin comprises sodium lignosulfonate (sodium lignosulfonate) or calcium lignosulfonate (calcium lignosulfonate),
The additive is the first additive, the second additive, and the third additive 1:0.2 ~ 0.8: A method for producing pellets for fuel using a mushroom waste medium comprising a 0.2 ~ 0.8 weight ratio.
According to claim 1,
The mixing step is a step of mixing 120 to 170 parts by weight of the dried mushroom waste medium and 70 to 90 parts by weight of the additive,
The additive is a first additive, a second additive and a third additive 1:0.4 to 0.6: a method for producing pellets for fuel using a mushroom waste medium comprising a 0.4 to 0.6 weight ratio.

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