KR100407374B1 - the method of producing solid fuel, using of recycled paper sludges - Google Patents

Abstract

The present invention relates to a method for producing a recycled fuel using waste, which is pulverized and selected after the composite waste synthetic resin and waste paper discharged from the recycled paper mill, which has been dependent only on incineration. As a molded solid fuel (RDF), it has excellent combustion efficiency, does not discharge pollutants during combustion, and suppresses chlorine corrosion inside a boiler.

Looking at the manufacturing process of the present invention in detail by the process sequence, the first step is a shredding step (S1), the composite waste synthetic resin and waste paper to be a raw material flows into the shredder 10 through the conveyor 70 to continuously shredded The second step is a sorting step (S2), the combustibles that can be used as a raw material of the renewable fuel (RDF) using the crushed raw material using the magnetic separator 20 and the wind separator 21 is impossible to use. It is a process of sorting by a nonflammable substance, and a 3rd process is a process of drying the raw material with a high water content in the dehydration and drying machine 30 to which hot air of 105 degreeC is applied in a dehydration and drying process (S3).

In addition, the fourth process is a carbonization process (S4), and the composite composite resin and waste paper dried are introduced into the vacuum carbonization furnace 40, and when the temperature in the carbonization furnace 40 is controlled to 350 ~ 400 ℃ The waste synthetic resin is carbonized, and the waste paper is heated to be nested between the carbonized composite waste synthetic resins. The fifth process is a mixing / molding process (S5), where the carbonized composite waste synthetic resin and waste paper are the primary mixers (50). Sodium oxide (Na2O) is introduced into the mixture, mixed with the composite waste synthetic resin, and then introduced into the secondary mixer 51 through the conveyor 70, borax (Na ₂ B ₄ O ₇ · 10H ₂ O ) The powder is introduced and mixed with the composite waste synthetic resin, and then extruded and cut using minimal heat and strong pressure. Finally, the sixth step of the cooling process (S6) is a composite containing the cut waste paper. Since the waste synthetic resin is rapidly cooled, the renewable fuel of the present invention (RD Complete F).

As such, the present invention replaces insufficient energy resources by producing a large amount of high-efficiency recycled fuel (RDF) through a six-stage processing process of the composite waste synthetic resin and waste paper collected in the recycled paper mill, and produced renewable fuel (RDF). By operating the medium and large boilers using), heating of various facilities and hot water supply are possible.

In addition, most of the composite waste synthetic resins and waste papers discharged from the recycled paper mill are prevented from being incinerated or disposed of as wastes, which significantly reduces air and soil pollution, resulting in a pleasant living environment. It is possible to burn completely, so there is little emission of exhaust gas, and there is another effect that can maximize the utilization of the value of the existing resources.

In addition, it is possible to produce large quantities of renewable fuels (RDF) quickly by automating the facilities of the facility, and it is possible to use the existing coal use facilities without major changes, thus making it possible to use a wide range of heat utilization and reduce production costs and equipment costs. It works.

Since the produced Regenerated Fuel (RDF) has a uniform shape, there is little fluctuation in thermal conductivity and uniform combustion at high temperature results in no emission of pollutants, and control of density can improve storage and transport properties, and water content is 1%. There is no need for the prevention of smoke reduction, and there is another effect that the inside of the boiler is not corroded by chlorine by the use of chemical additives.

Description

Method for producing solid fuel, using of recycled paper sludges

The present invention relates to a method for producing a solid fuel using waste, and more particularly, after pulverizing and screening composite waste synthetic resin and waste paper discharged from a recycled paper mill, carbonization, compression and molding by adding various chemicals The present invention relates to a method for producing a solid fuel using recycled paper sludge that has excellent combustion efficiency as a regenerated fuel (RDF), does not discharge pollutants during combustion, and prevents chlorine corrosion inside a boiler.

Although resources are limited in today's world, energy resources are gradually being depleted due to population growth and accelerated consumption inclinations. Also, a large amount of waste is generated through various production and consumption activities, causing serious environmental pollution. .

In particular, the composite waste synthetic resin and waste paper produced at the recycled paper mill, which uses recycled paper to make recycled paper, are enormously large and mixed in various forms. It acts as a cause of pollution and measures for this are required.

Among the things currently being developed as alternative fuels, the most noticeable is the energy recovery system, that is, the processing of wastes and the use of them as recycled fuels (RDFs). Although partially commercialized through development, the inside of the conventionally manufactured recycled fuel (RDF) has a form in which crushed and dried waste is compressed as it is, and is heat-treated to maintain a constant shape only on the outside. It is difficult to ignite, the calorific value is only half of the existing fossil fuel, there is a problem that a large amount of sludge and environmental pollutants are generated and discharged.

In addition, the use of pollution-free energy, such as solar, geothermal, wind, tidal, etc. as a substitute fuel is subject to a lot of natural constraints, it is difficult to commercialize, and the initial installation cost also includes a huge problem.

Therefore, the present invention has been invented to solve the above problems, and because the complex waste synthetic resin and waste paper collected in the recycling paper mill produces a high-efficiency recycled fuel (RDF) in a large amount through a six-step processing process, energy is insufficient. It replaces resources, and uses the produced renewable fuel (RDF) to operate medium and large boilers, which have the purpose of heating and supplying hot water of various facilities.

In addition, most composite synthetic resins and waste papers discharged from recycled paper mills are prevented from being incinerated or disposed of as wastes, which significantly reduces air and soil pollution, promoting a pleasant living environment and maximizing the utilization of the value of resources. Another purpose.

In addition, the facility of the facility can be automated to quickly produce a large amount of renewable fuel (RDF), and the produced renewable fuel (RDF) has no emission of pollutants during combustion, and the inside of the boiler is not corroded by chlorine gas. It is another object to burn stably.

1 is a manufacturing process diagram of the present invention

2 is a block diagram of a manufacturing apparatus of the present invention

3 is a partially cutaway perspective view of a carbonization furnace used in the present invention.

[Explanation of symbols on the main parts of the drawings]

S1: Crushing Process S2: Sorting Process

S3: Dewatering and Drying Process S4: Carbonization Process

S5: Mixing and Molding Process S6: Cooling Process

10: crusher 20: magnetic separator

21: Wind sorter 30: Dewatering and drying machine

40: carbonization furnace 41: screw

42: heating device 43: hopper

50: 1st mixer 51: 2nd mixer

52 compression and molding machine 60 cooler

70: conveyor

The present invention relates to a method for producing a solid fuel using waste, and the composite waste synthetic resin and waste paper discharged from the recycled paper mill are pulverized and screened, carbonized, and compressed and molded by adding chemicals to recycle the solid state. As fuel (RDF), the combustion efficiency is excellent, and it does not discharge pollutants during combustion, and has the feature of suppressing chlorine corrosion in the boiler.

The raw materials used in the present invention are used to collect coated paper, various vinyls, synthetic resin strings, etc., which are not recycled at a factory that produces recycled paper using waste, and are discarded by landfill or incineration, and the like. In general, 90% of the composite waste synthetic resin and 10% of the waste paper are mixed.

The composite waste synthetic resin is used as a main raw material through the carbonization process, and the waste paper paper prevents the melting phenomenon of the composite waste synthetic resin to maintain the shape of the recycled fuel (RDF) formed until the final combustion, and serves as an auxiliary fuel. Do it. This has the advantage of shortening the process of directly mixing a certain ratio of paper or rice husk in the manufacturing process of the existing renewable fuel (RDF).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a manufacturing process diagram of the present invention, and a total of six steps are used to produce a solid fuel fuel (Refuse Derived Fuel; RDF), which is a crushing step (S1) or a sorting step ( S2), drying and dehydration process (S3), carbonization process (S4), mixing and molding process (S5) and cooling process (S6) and the details are as follows.

The first step is a shredding step (S1), the composite waste synthetic resin and waste paper to be a raw material is introduced into the shredder 10 through the conveyor 70 to have a structure that is continuously broken. The purpose of the crushing is not merely to reduce the weight, the ultimate purpose is to improve the efficiency of the post-treatment and to facilitate the selection of resources for the useful waste, and to increase the combustion efficiency and induce normal combustion.

The second step is a sorting process (S2), the combustibles that can be used as a raw material of the renewable fuel (RDF) using the crushed raw material using the magnetic separator 20 and the wind separator 21 and non-combustibles that can not be used as raw materials Screening process.

As the crushed raw material is transferred by the conveyor 70, the crushed raw material passes through a magnetic separator 20 installed at an end thereof, which is a representative method of separating and recovering a material having magnetic properties such as iron, and the magnetic body is a magnetic conveyor 70. Rotating the end of the container is loaded in a collecting container separately installed at the bottom, and the synthetic resin, paper, and non-ferrous metal, which are magnetic materials, are loaded in the collecting container connected to the next process at the end of the magnetic conveyor.

The raw material that has completed the primary sorting is conveyed by the conveyor 70 to the wind sorter 21 which is the secondary sorting process (S2), which is a sorting method using a difference in the speed at which an object falls in the air. By blowing air vertically, relatively heavy nonferrous metals and inorganic materials are loaded and recovered near the tuyeres, and synthetic resins and papers used as recycled materials are loaded at locations separated from the tuyeres. It is transferred to the drying step (S3).

The third process is the dehydration and drying process (S3), and the sludge discharged from the recycled paper mill functions a lot of moisture due to the process characteristics of the recycled paper mill. The moisture is dried by hot air at 105 ° C. in the dehydration / dryer 30. In this case, the carbonization process (S4) to be described later, the uniform carbonization occurs as a whole, prevents the phenomenon of raising the carbonization temperature by moisture, and has the effect of significantly reducing the occurrence of white lead.

The fourth process is a carbonization process (S4), and the dried composite waste resin and waste paper are put into a vacuum carbonization furnace 40 into which no air is introduced, and the temperature in the carbonization furnace 40 is controlled to 350 to 400 ° C. Then, the injected composite waste synthetic resin is carbonized, and the waste paper is formed between the carbonized composite waste synthetic resin. Hydrogen chloride (HCl) gas generated in the carbonization process is first exhausted to the outside of the carbonization furnace 40 to react with the alkali solution to be harmless and released to the atmosphere.

The carbonization furnace 40 is configured as shown in FIG. 3 of the present invention. In the carbonization furnace 40, two closed long screws 41 having a length of about 3 m are provided, and a heating device 42 is provided under the carbonization furnace 40. As the screw 41 rotates, the dried composite synthetic resin and waste paper are transported at the same time as heating, and amorphous carbon is produced by pyrolysis to deform to be very useful when used as fuel. Play a role.

On the other hand, a part of the heat recovered in the carbonization step (S4) is sent to the drying step (S3) and reused has a configuration that can obtain the effect of the overall fuel savings.

In addition, the fifth step is a mixing and molding step (S5), wherein the carbonized composite waste synthetic resin and waste paper are introduced into the primary mixer 50 through the conveyor 70, and when a predetermined amount is added, sodium oxide (Na2O) ) Is introduced into the primary mixer 50 and mixed with the composite waste synthetic resin. It is formed into renewable fuel (RDF) and reacts with sulfur oxides (SOx) during combustion to be discharged in the form of stable manganese, a hydrate of sodium sulfate (Na ₂ SO ₄ ), to prevent air pollution. do.

In addition, when the composite waste synthetic resin that has passed through the primary mixer 50 is introduced into the secondary mixer 51 through the conveyor 70, the borax (Na ₂ B ₄ O ₇ · 10H ₂ O) powder is added to the secondary mixer 51. ) Is mixed with the composite waste synthetic resin, which is formed into recycled fuel (RDF), and when heated to 350 ~ 400 ℃ during combustion, it loses crystal water and expands to become anhydride, and it is continuously heated to melt at 878 ℃ to become transparent glass. This is because it is thinly adsorbed on the entire inner surface of the combustion chamber of the boiler to prevent chlorine corrosion by hydrogen chloride (HCl).

After the two-step mixing process, a molding process is performed to have a predetermined shape by the compression / molding machine 52, which softens the composite waste synthetic resin material using minimal heat and then uses a strong pressure. By extruding and cutting into a shape similar to that of oval briquettes to have an alternative application to existing solid fuel combustion boilers.

Finally, the sixth step of the cooling step (S6) is to cool the composite waste synthetic resin containing the waste paper of the cut hot and flexible state rapidly by the cooler 60 to deform the shape and composition of the carbonized composite waste synthetic resin material This does not occur, and serves as a drying to release the contained moisture to the outside once the temperature is relatively low.

The recycled fuel (RDF) finally completed through the six steps is a form in which waste paper is contained in the carbonized composite waste synthetic resin material, and sodium oxide (Na ₂ O) and borax (Na ₂ B ₄ O ₇ · 10H ₂ O). Is mixed at a constant rate and a very dry good quality renewable fuel (RDF) having a water content of less than 1% can be obtained.

The present invention made by the above manufacturing process was analyzed by the applicant of the Renewable Fuel (RDF) at the Institute of Environmental Industry, Gyeongju, Korea. As a result, the following analysis results were obtained, and the calorific value averaged 6000 Kcal / It is characterized by high and stable weight of more than kg, very low moisture content, and heating temperature up to 800 ~ 1200 ℃.

▣ RDF Analysis Result

division Result division Result Calorific Value (Kcal / kg) Psalm A 6106.41 moisture(%) 0.20 Psalm B 6216.89 Solids (%) 99.80 Average 6161.65 Ignition loss (%) 91.24 Initial weight (kg) 15.18 Volatile Solids (%) 91.04 Weight after drying at 105 ℃ (kg) 15.15 Organic matter content (%) 91.22 Weight after Sintering at 605 ℃ (kg) 1.33

Gyeongju Seorabol University Environmental Industry Research Institute

Renewable fuel (RDF) manufactured as described above can be used as auxiliary fuel in existing cogeneration plants, can be used in existing boilers, such as dyeing or textile mills using solid fuel, And it can be used without significant changes to the existing solid fuel using facilities, such as heating in a plastic house and heating of a centralized multi-family house.

As such, the present invention replaces insufficient energy resources by producing a large amount of high-efficiency recycled fuel (RDF) through a six-stage processing process of the composite waste synthetic resin and waste paper collected in the recycled paper mill, and produced recycled fuel (RDF). By using the medium and large boilers, heating and hot water supply of various facilities are possible.

In addition, most of the composite waste synthetic resins and waste papers collected at the recycled paper mill are prevented from being incinerated or disposed of as wastes, which significantly reduces air and soil pollution, thus creating a pleasant living environment and having low fluctuations in heat generation. It is possible to burn completely, so there is little emission of exhaust gas, and there is another effect that can maximize the utilization of the value of the existing resources.

In addition, it is possible to produce large quantities of renewable fuels (RDF) quickly by automating the facilities of the facility, and it is possible to use the existing coal use facilities without major changes, thus making it possible to use a wide range of heat utilization and reduce production costs and equipment costs. It works.

Since the produced Regenerated Fuel (RDF) has a uniform shape, there is little fluctuation in thermal conductivity and uniform combustion at high temperature results in no emission of pollutants, and control of density can improve storage and transport properties, and water content is 1%. There is no need for the prevention of smoke reduction, and there is another effect that the inside of the boiler is not corroded by chlorine by the use of chemical additives.

Claims (4)

Shredding process (S1) of continuously crushing the composite waste synthetic resin and waste paper collected from the recycled paper mill by the shredder 10, Separation process (S2) of sorting the crushed raw material into a combustible and non-combustible that can be used as a raw material of the renewable fuel (RDF) using the magnetic separator 20 and the wind separator 21, Dehydration and drying step (S3) of drying the raw material having a high water content by dehydration and drying machine 30 to which hot air at 105 ° C. is applied, When the dried composite waste resin and waste paper are put into the vacuum carbonization furnace 40, and the temperature is controlled at 350 to 400 ° C., the injected composite waste resin causes a carbonization reaction, and the waste paper is nested between the carbonized composite waste resin. Heating carbonization process (S4), The carbonized composite waste synthetic resin and waste paper are introduced into the primary mixer 50, mixed with sodium oxide (Na2O), and introduced into the secondary mixer 51 through the conveyor 70 to form borax (Na ₂ B ₄ O _7). 10H ₂ O) mixing and molding process (S5), which is mixed with the powder and then extruded and cut with minimal heat and strong pressure Cooling step (S6) for rapidly cooling the composite waste synthetic resin containing the cut paper waste processing; Method for producing a solid fuel using the sludge of recycled paper, characterized in that consisting of. The method of claim 1, The carbonization process (S4) is a composite waste synthetic resin and waste paper dried along the two sealed long screw 41 provided in the carbonization furnace 40, while being transported, 350 ~ 400 ℃ by the heating device 42 When heated to 0%, amorphous carbon is produced by the pyrolysis reaction to show a high combustion efficiency upon ignition. The method of claim 1, Sodium oxide (Na 2 O) to be mixed in the primary mixer 50 of the mixing and molding process (S5) is molded into a regenerated fuel (RDF) to react with sulfur oxides (SOx) during combustion and sodium sulfate (Na ₂ SO ₄ Method for producing a solid fuel using the sludge of recycled paper, characterized in that discharged in the form of a 10-hydrate of the) to prevent air pollution. The method of claim 1, Borax (Na ₂ B ₄ O ₇ · 10H ₂ O) powder to be mixed in the secondary mixer 51 of the mixing and molding step (S5) is formed of a recycled fuel (RDF) when heated to 878 ℃ or more during combustion A method for producing a solid fuel using sludge from recycled paper, characterized by melting and adsorbing thinly in a combustion chamber of a boiler to prevent chlorine (HCl) corrosion.