KR101464919B1 - Hybrid sludge-liquid type biomass mixed fuel, apparatus and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a hybrid sludge-liquid biomass mixed fuel, a device for producing the same, and a method for producing the same. More specifically, the present invention relates to a hybrid sludge-liquid biomass mixed fuel, a device for producing the same, and a method for producing the same, wherein sewage sludge including organic or inorganic components is mixed with hydrophilic or hydrophobic liquid biomass in order to be dried and carbonized according to the kind of liquid biomass, so that combustion properties and heat generation rates are improved. Accordingly, problems such as moisture re-adsorption can be solved.

Description

Technical Field [0001] The present invention relates to a hybrid sludge mixed fuel including a liquid biomass, a manufacturing method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid sludge-liquid biomass mixture fuel, a production apparatus and a production method thereof, and more particularly to a hybrid sludge- To a hybrid sludge-liquid biomass mixed fuel, which is improved in combustion characteristics and calorific value through a drying and carbonization process depending on the type of the sludge-liquid biomass fuel.

Interest in coal as an energy source is rising again due to rising oil prices and distrust of nuclear energy stability. However, coal is the largest source of carbon dioxide in fossil fuels, which is a poor source of competitiveness given the global warming issue. As a result, the use of renewable energy is one of the issues that are currently being addressed globally as an energy source. This is due to the fact that the emission of carbon dioxide is reduced compared to conventional fossil fuels such as petroleum and coal, This is because it is attracting attention as an energy source. However, in Korea, when new or renewable energy sources such as solar or wind power are used for power generation or heating, land use and diffusion are limited due to differences in generation cost compared to fossil fuels.

On the other hand, the use of renewable energy is one of the issues that have been raised in the world as an energy source. This means that the emission of carbon dioxide is reduced compared to existing fossil fuels such as petroleum and coal, This is because it is attracting attention as an energy source. However, in Korea, when new or renewable energy sources such as solar or wind power are used for power generation or heating, land use and diffusion are limited due to differences in generation cost compared to fossil fuels.

Renewable Portfolio Standard (RPS) has been introduced since 2012, as Korea has been dealing with depletion of fossil fuels and the reduction of greenhouse gas emissions due to the international treaty, the Climate Change Convention. It is a burden to energy providers.

The amount of sewage sludge generated is about 2.9 million tons of organic sewage sludge generated in 2008, and 2.57 million tons of organic waste sludge is generated. In addition, the amount of inorganic sewage and wastewater sludge not containing organic matter is about 2,610,000 tons, and most of the discharged amount of sewage and wastewater sludge is dumped into the sea causing various marine pollution.

However, the standards for the emission of waste including sewage sludge have been significantly strengthened. In particular, since the London Convention, marine discharges are prohibited in 2012.

Since 2009, the government has decided to implement organic sewage sludge after drying and mixed combustion with coal. However, due to low calorific value and high water content of heavy metals and dry sludge contained in wastewater sludge, And mixed combustion is not actively performed.

In addition, in the case of biomass coexistence, there is a problem such as reduction in power generation efficiency due to combustion of biomass having a relatively low calorific value as compared with coal. That is, in the case of a fuel simply mixed with coal and oil-based biomass, the surface of the coal is coated with oil or oil is impregnated into the pores. However, due to the low surface tension of the oil itself and the lack of coupling between the oil-based biomass and the coal surface, the respective fuels, namely coal and biomass, maintain their original combustion characteristics and eventually exhibit different combustion characteristics. When this is applied to a power plant, oxygen is preferentially consumed excessively due to the low-temperature combustion pattern of the oil at the front of the burner. As a result, the amount of unburned carbon increases and the power generation efficiency is reduced do.

Korean Patent Publication No. 2010-0018818 discloses that sludge having a moisture content of 80% or more is used as a mixed fuel of coal-fired power plant by applying microwave heat source and hydrophobic bituminous coal and anthracite- At a temperature of 150 DEG C or lower which is lower than the melting point of the coal-fired power plant, and a manufacturing apparatus for carrying out the method.

Korean Patent Publication No. 2010-0032664 discloses that at least 80% of the humidified sewage sludge can be dried at a low temperature of 105 ° C in a short time of about 30 minutes in the case of using dry sludge charcoal which can utilize humidified sewage sludge. And a microwave drying device including a wet sludge feed input part and a discharge part for discharging dry sludge charcoal and microwave application means for applying a microwave to the wet sludge to generate dry sludge charcoal, A cylindrical inner cylinder having a screw vane in which the dry sludge char is dried to be supplied with the discharge portion while rotating the supplied moist sludge at a predetermined speed and an outer cylinder equipped with a microwave applying means for applying a microwave to the wet sludge And the wet sludge supply and input portion is located at one end side of the cylindrical inner cylinder, Has a device is disclosed for the preparation of a wet sludge that is located at the other end side that is opposite of the inner tube into the sludge burnt for thermal power plant mixed combustion.

In Korean Unexamined Patent Publication No. 2002-0027623, the water content of the sludge is further ultrasonically treated to lower the water content of the dehydrated sludge to adjust the water content from 85% to 72%, and a heat exchanger is installed for the heat source circulated to the atmosphere for energy recovery Reduction of the latent heat of the sludge itself due to the loss of organic matter during pyrolysis reduces the operating conditions of the furnace from around 400 ° C to 345 ° C and reduces the contact time by using a rotary rotary kiln system instead of operating the dewatered sludge by ultrasonic treatment Discloses an apparatus for producing carbonized fuel of sewage sludge which is carried through a carbonization apparatus having a carry-in hopper, a dehydrated sludge conveyor, a quantitative feeder, a drier, and a rotary kiln.

Korean Patent Publication No. 10-1195416 discloses that the hydrophilic surface present in the lower carbon is coated with the carbon component of the biomass-derived material and is modified to be hydrophobic so that the natural carbon component inherent to the coal and the artificial carbon And a method of producing the hybrid coal, comprising the steps of: kneading a coal with a solution of a biomass-derived material to form a paste; ii) feeding the paste into a carbonization furnace to dry and carbonize the biomass- Wherein the step (ii) is carried out at room temperature and under an atmospheric pressure to prepare a paste. The method comprises the steps of: (i) mixing the paste with a biomass-derived carbon component; ≪ / RTI > to < RTI ID = 0.0 > 240 < Discloses a method for producing lead coal.

Korean Patent Publication No. 1984-0001778 discloses a method of pulverizing raw coal to a size of about 40 microns or less in the air-free state to form a hydrophobic coal portion and a hydrophilic dust portion, bringing the aqueous solution and the portions into contact with each other, A method of producing a particulate coal-liquid mixture comprising providing a hygroscopic and leaving the coal-containing particles substantially dry, separating the coal portion and the dust, and mixing the coal portion and the liquid.

In Korean Patent Publication No. 10-1210928, glycerol, which is a by-product of the biodiesel production process, is impregnated into the hydrophilic pores and hydrophilic surfaces of raw coal or dry coal containing moisture, and then dried and hydrophobically modified so that reabsorption of moisture remarkably occurs even after drying Suppressed

The high heating capacity hybrid coal impregnated with glycerol produced by the present invention produced by the present invention remarkably suppresses reabsorption of moisture and can keep the high calorific value of dry coal as it is, It is known that glycerol impregnated with coal has an effect of reducing the amount of carbon dioxide emitted by a power plant.

In order to promote the utilization and diffusion of renewable energy and secure the supply stability of biomass fuel, there is a demand for development of a breakthrough technology that can utilize various biomass-derived materials. Therefore, various methods of sludge treatment and environmentally friendly and economical treatment methods are desperately required.

However, no fuel, fuel manufacturing apparatus and fuel manufacturing method technology meeting these requirements have been proposed yet.

Korea Patent Publication No. 2010-0018818 Korean Patent Publication No. 2010-0032664 Korea Patent Publication No. 2012-0027623 Korean Patent Publication No. 10-1195416 Korean Patent Publication No. 1984-0001778 Korean Patent Publication No. 10-1210928

The present invention has been devised to carry out the above-mentioned researches, and it is an object of the present invention to provide a hybrid sludge-liquid phase biomass mixed fuel, a manufacturing apparatus and a manufacturing method thereof, and more particularly to a hybrid sludge- Liquid biomass mixed fuel, a manufacturing method thereof, and a method of manufacturing the hybrid sludge-liquid biomass mixed fuel, wherein the combustion characteristic and the calorific value are improved through the drying and carbonization processes depending on the kind of the liquid biomass after mixing the hydrophilic or hydrophobic liquid biomass with the sewage sludge To provide.

In order to achieve the above object, there is provided a method for producing a sewage sludge blended fuel comprising at least one of liquid hydrophilic biomass and hydrophilic liquid biomass, wherein the hydrophilic or hydrophobic liquid biomass is mixed with sewage sludge to form a mixture A first step; A second step of adding a binder to the mixture to form a mixed fuel; A third step of drying the mixed fuel; A fourth step of carbonizing when the vaporization temperature of the liquid biomass contained in the mixed fuel is higher than 105 ° C; Wherein the liquid biomass is at least one of hydrophilic and hydrophobic liquid biomass.

In the first step, the liquid biomass may include more than 0 to less than 100% by weight of the liquid biomass, and more than 0 to less than 100% by weight of the sewage sludge.

The liquid biomass may be selected from the group consisting of ligno-cellulose and saccharides including enzymes of sucrose, maltose, lactose and starch, glucose and fructose, Characterized in that it comprises at least one of monosaccharide, glycerol and crude glycerol, which contains fructose and galactose, or a hydrophilic biomass or palm oil, rapeseed oil, soybean oil, And may include any one or more of all vegetable oils and their residues, including canola oil, corn oil, coconut oil, sunflower oil, canola oil, all animal oils such as tallow and fish oil, and all the waste oil.

And a fifth step of mixing coal powder with the mixed fuel.

In the fifth step, coal powder may be added in an amount of more than 0 to 50% by weight with respect to the mixed fuel.

The sludge may comprise any one or more of organic sewage sludge, organic wastewater sludge, inorganic sewage sludge, and inorganic wastewater sludge.

In the second step, more than 0 to 50% by weight of the binder may be added to the mixture.

In the third step, the drying may be performed in a temperature range of 80 ° C or more to 105 ° C or less.

In the fourth step, the carbonization temperature may be higher than 105 ° C and lower than 300 ° C.

The binder may be an aqueous solvent such as pure water, fresh water, nordic acid, brine, or a mixture of alcohol and water in the form of water, and aliphatic hydrocarbons such as hexane; Aromatic hydrocarbons such as benzene, toluene, xylene and methylnaphthalene; Heterocyclic compounds such as quinoline and pyridine, ketones such as acetone, methyl ethyl ketone and cyclohexanone; Esters such as methyl acetate and methyl acrylate; Amines such as diethylenetriamine and N, N-dimethylaminopropylamine; Ethers such as diethyl ether, propylene oxide and tetrahydrofuran (THF); amides such as N-methylpyrrolidone (NMP), dimethylformamide and dimethylacetamide; And an organic solvent such as an aprotic polar solvent such as hexamethylphosphoramide, dimethylsulfoxide, and the like.

The coal may be any one or two or more selected from among peat, lignite, sub-bituminous coal, bituminous coal and anthracite coal.

The mixed fuel may be formed under a pressure condition of atmospheric pressure to 10 MPa.

The present invention also provides a sewage sludge mixed fuel comprising at least one liquid biomass of hydrophilic or hydrophobic liquid biomass, which is produced by any one of the above methods.

The combustion characteristics of the sewage sludge mixed fuel including the liquid biomass show the combustion characteristics of a single fuel rather than the independent combustion characteristics due to the mixing of the fuel having different reactivity.

Further, the present invention is characterized in that the first step and the second step are carried out in a mixer, the third step is carried out in a drier, and the fourth step is carried out in a carbonizer. The liquid biomass of any one of hydrophilic or hydrophobic liquid biomass The present invention also provides a sewage sludge mixed fuel producing apparatus comprising the above-

The mixer is for mixing fluids and is not particularly limited in its form. But not limited to, a mixer such as a Tumbling mixer, a Convective mixer, a Fludized mixer, and a High shear mixer.

The dryer is for drying the fluid and is not particularly limited in its form. A convection drier, a radiation dryer, a contact drier, a hot air drier, and a freeze drier may be applied, but the present invention is not limited thereto.

The carbonization is for carbonization of the mixed fluid, and there is no particular limitation on the conditions of carbonization and the form of the apparatus. The non-oxidizing fluid for carbonization may be at least one of gas phase fluids such as nitrogen and argon. The temperature and pressure conditions are not particularly limited as long as they are determined according to the carbonization conditions of the target fluid.

According to the hybrid sludge mixed fuel including the liquid biomass of the present invention, the manufacturing apparatus and the manufacturing method thereof, the hydrophilic and hydrophobic liquid biomass is impregnated into the pores of the sludge to improve the binding force between the sludge and the liquid biomass have. Therefore, sludge impregnated with liquid biomass, that is, hybrid sludge, can improve fuel efficiency due to an increase in calorific value compared to conventional sludge.

Further, since the hybrid sludge according to the present invention can burn the combustion pattern of the liquid biomass substantially in the same pattern as the combustion pattern of the sludge, the generation amount of unburned carbon can be reduced, do. In addition, in the case of hybrid sludge using liquid biomass such as molasses, it is possible to reduce transportation costs due to reduction of moisture adsorption due to hydrophobicity of the surface.

The hybrid sludge according to the present invention exhibits a combustion characteristic of a two-in-one fuel together with an increase in a calorific value, so that the hybrid sludge can be used for a power plant or the like by using the hybrid sludge as its own fuel.

1 is a flowchart illustrating a method of manufacturing a hybrid sludge according to the present invention.
FIG. 2 is a graph showing the pore size distribution of hybrid sludge impregnated with molasses and sewage sludge; FIG.
3 is a graph showing pore size distribution of hybrid sludge and sewage sludge impregnated with glycerol.
FIG. 4 is a graph showing a van Krevelen diagram of hybrid sludge impregnated with molasses and sewage sludge; FIG.
5 is a graph showing the van Krevelen diagram of hybrid sludge and sewage sludge impregnated with glycerol.
6 is a graph showing the combustion pattern of the dried sewage sludge and the carbonated sewage sludge.
FIG. 7 is a graph showing the combustion pattern of dried molasses and carbonized molasses.
8 is a graph showing the combustion patterns of glycerol, dried sewage sludge, and glycerol impregnated hybrid sludge.
9 is a graph showing the combustion pattern of a hybrid sludge impregnated with an excessive amount of glycerol.
10 is a graph showing a combustion pattern of hybrid sludge mixed with molasses.
11 is a graph showing the combustion pattern of simple molten molasses and sewage sludge.
12 is a graph showing the chemical structure change of hybrid sludge and sewage sludge impregnated with glycerol.
13 is a graph showing a chemical structure change of hybrid sludge impregnated with molasses and sewage sludge;
14 is a photograph showing a contact angle of a hybrid sludge impregnated with molasses and a contact angle of dried sewage sludge.
15 is a graph comparing moisture reabsorption rates of hybrid sludge using molasses and dried sewage sludge.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout.

Also, the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should properly define the concept of the term to describe its invention in the best way The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention. Therefore, the constitutions described in the embodiments described herein are merely the most preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention. Therefore, various equivalents which can be substituted at the time of application It should be understood that variations can be made.

The present invention provides a hybrid sludge for a high-quality fuel and a two-in-one fuel combustion pattern and a method of manufacturing the same, by preparing hydrophilic and hydrophobic liquid biomass into the pores of the sludge through impregnation have. The present invention also provides a hybrid sludge comprising sludge and hydrophilic and hydrophobic liquid biomass. In addition, in the hybrid sludge according to the present invention, the hydrophilic and hydrophobic liquid biomass may be prepared through mixing with the sludge and drying (80-105 degrees). In the case of liquid biomass like molasses, it is possible to dramatically increase the carbon content through the carbonization process (200-300 ° C), mixing the hydrophilic and hydrophobic liquid biomass with the sludge , Impregnating a mixture of the liquid biomass and sludge into the pores of the sludge through drying (80-105 degrees), and carbonizing (200-300 degrees) in the case of liquid biomass such as molasses The present invention also provides a method for producing a hybrid sludge. In the method of manufacturing hybrid sludge according to the present invention, in the mixing step, the hydrophilic and hydrophobic liquid biomass may be mixed with 0.1 to 100% by weight of the sludge.

The coal used in the present invention may be any one selected from peat, lignite, bituminous coal, bituminous coal and anthracite.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the drawings, in which the hydrophobic coal-biomass granular fuel and the method for its preparation are described in detail.

The hybrid sludge according to the present invention comprises sludge and hydrophilic and hydrophobic liquid biomass. At this time, the sludge includes all sludge of raw sludge and sludge cake. The sludge includes, but is not limited to, organic sewage sludge, organic wastewater sludge, inorganic sewage sludge, and inorganic wastewater sludge.

Biological liquids are hydrophilic and hydrophobic liquid biomass, for example, hydrophilic biomass includes ligno-cellulose and enzymes of sucrose, maltose, lactose, and starch. All hydrophilic biomass, including saccharide, glucose and fructose, and galactose, including monosaccharides, glycerol, and glycerol residues, But are not limited thereto.

In addition, the hydrophobic biomass may be any animal oil such as palm oil, rape oil, soybean oil, jatropha oil, corn oil, coconut oil, sunflower oil, canola oil and all vegetable oils and their residues, all animal oils such as tallow and fish oil, Including, but not limited to, all hydrophobic families of biomass.

The method of manufacturing the hybrid sludge according to the present invention will now be described with reference to FIG. 1 is a flowchart illustrating a method of manufacturing a hybrid sludge according to the present invention.

First, in step S10, sludge and hydrophilic and hydrophobic liquid biomass are prepared, and a mixture of the sludge and the liquid biomass is prepared. For homogenous mixing of the liquid biomass and the sludge, the liquid biomass is mixed with some water and mixed with the sludge. The liquid biomass may be used in an amount of 0.1 to 100% by weight based on sludge.

The hybrid sludge can be prepared by mixing the hydrophilic and hydrophobic liquid biomass into the pores of the sludge so that the liquid biomass can be impregnated, and then drying the slurry at 80 to 105 deg. In this state, the hybrid sludge carbonized at 200 to 300 deg., Which is the step S30, uses liquid biomass such as sugar.

Here, the manufacturing process is divided according to the difference in shape of the liquid biomass (step S20, step S30), so that evaporation of the liquid biomass differs.

The hybrid sludge produced by the method according to the present invention exhibits combustion characteristics of a two-in-one fuel. At this time, the liquid biomass as much as the pore volume of the sludge is converted into the combustion pattern of the sludge, and the excess liquid biomass, that is, the liquid biomass bonded to the surface of the sludge, shows an existing combustion pattern. Thus, only the liquid biomass impregnated into the pores of the sludge shows almost the same combustion pattern as the sludge.

In order to evaluate the characteristics of the hybrid sludge according to the present invention, the hybrid sludge according to the embodiment was manufactured as follows.

The sludge used in the wastewater treatment plant (Daejeon, Korea) was a sludge cake with a water content of 70% or more. Molasses and pure grade glycerol (Duksan) were used as the liquid biomass. Respectively.

In the manufacturing process of the hybrid sludge according to this embodiment, a certain amount of the liquid biomass is added to the sludge by wet impregnation with a small amount of water. Next, 80-105 also allows the liquid biomass to be sufficiently impregnated into the pores of the sludge through drying. Hybrid sludge using glycerol can be completed in 80-105 degree drying process.

In this case, the hybrid sludge using molasses is further pre-carbonized in a nitrogen (N 2) atmosphere at a temperature of 200-300 ° C. The produced hybrid sludge has different characteristics depending on the kind of the liquid biomass.

Changes in pore structure, fuel and combustion characteristics, chemical structural changes, and hydrophobicity of the hybrid sludge were analyzed.

The results of the analysis as described above are as follows.

Pore structure change of hybrid sludge

Sewage sludge has a very wide range of pores ranging from 10 to 200 nm, and pore volume decreases as hydrophilic and hydrophobic liquid biomass is impregnated with these pores. In addition, after the liquid biomass is impregnated, the mesopores of 5-10 nm of the sewage sludge are generated through the drying process. This is because the liquid biomass is produced by the occurrence of blood coagulation of cell walls existing in the inside of the sewage sludge during the drying process. As a result, the liquid biomass is filled with the liquid biomass instead of the water existing in the mesopores of the sewage sludge, Of fuel. (Figs. 2 and 3, Table 1)

&Quot; SD " represents a dried sewage sludge, and " HSK " represents a hybrid sludge. &Quot; SD / *** " indicates SD dried at *** C. &Quot; HSK / *** / M ## " indicates HSK prepared by impregnating ## SD by molybdenum (M) relative to SD and SD dried at *** C. &Quot; HSK / *** / G ## " indicates HSK prepared by impregnating ## SD by Glycerol (G) relative to SD and SD dried at *** C.

Fuel Characteristics of Hybrid Sludge

Sewage sludge has a very low calorific value due to its high moisture content. Therefore, it is impossible to use the fuel as a single fuel in a power plant and the efficiency is very low. However, in the case of hybrid sludge, the combination of hydrophilic and hydrophobic liquid biomass leads to an increase in calorific value and carbon. In the case of the hybrid sludge based on the glycerol-based hybrid sludge, in the case of the hybrid sludge produced by the glycerol composed of the volatile substance, the content of the volatile component increases as the glycerol content increases . In case of molasses - based hybrid sludge, molybdenum content is increased due to carbonization process of molasses, and carbon content is increased in molybdenum - based hybrid sludge. Compared to sewage sludge before treatment, carbon and volatile components are increased and calorific value is rapidly increased regardless of the type of biosol. (Tables 2 and 3)

As shown in FIG. 4 and FIG. 5, when applied to the van Krevelen diagram, it can be seen that the sludge was moved to the lower side of the sewage sludge before the treatment. This is due to the decarboxylation, dehydration and demethanation of coal sludge in the course of the production of hybrid sludge.

It is also an important feature of the hybrid sludge that the increase in the calorific value, the high quality of the fuel and the characteristics of the fuel according to the liquid biomass are different from those of the sewage sludge.

Combustion Pattern of Hybrid Sludge

6 to 11 are graphs showing combustion patterns of hybrid sludge, FIG. 6 is a graph showing combustion patterns of sewage sludge carbonized at 250 degrees with dried sewage sludge, FIG. 7 is a graph showing combustion patterns of dried molasses and 250 degrees Shows the combustion pattern of carbonized molasses. Figure 8 shows the combustion pattern of glycerol, dried sewage sludge, and hybrid sludge with 5% glycerol in sewage sludge. Referring to FIG. 8, the combustion pattern of glycerol starts to evaporate at about 150 degrees, and when it goes beyond 200 degrees, it is burned. Hybrid sludge impregnated with 5% glycerol showed a combustion pattern similar to that of dried sewage sludge, but it can be seen that the combustion pattern of glycerol is shown in FIG. 9 in which excess (5% or more) of glycerol is contained. This is due to the different surface area of the pores of the sewage sludge, which can impregnate a larger amount of the liquid biomass in the case of sewage sludge having a large surface area.

Fig. 10 shows the combustion pattern of the hybris sludge impregnated with dried sewage sludge and molasses. Unlike hybrid sludge impregnated with glycerol, hybrid sludge impregnated with molasses is not only impregnated with excessive amount but also maintains the combustion pattern of sewage sludge. In the case of molasses, molasses is transformed from liquid to solid phase through carbonization at around 200-300 ° C. Carbonized molasses is fixed in the pores of sewage sludge to form artificial carbon, A two-in-one fuel combustion pattern will be seen. However, when the blend is burned rather than in the pore, the combustion pattern of molasses appears as shown in FIG.

Thus, the combustion pattern of the hybrid sludge according to the type of the liquid biomass shows various results. However, only when the liquid biomass is combined with the pores, the combustion characteristics of the two-in-one fuel .

Chemical Structure Change of Hybrid Sludge

When the hybrid sludge is produced, the chemical structure varies depending on the kind of the liquid biomass and the treatment temperature. First, in the case of the glycerol-based hybrid sludge shown in FIG. 12, OH functional groups of the hydroxyl groups rise in the range of 3,600 to 3,200 cm -1 as the content of glycerol increases, This is the effect of hydrogen. However, in the case of the molasses-based hybrid sludge shown in FIG. 13, OH functional groups of hydroxyl groups in the range of 3,600 to 3,200 cm-1 and 2,960 to 2,840 cm-1 Of the CH functional groups. In addition, the P = O phosphonic acid in the range of 2,400 to 2,300 cm -1 increases and the amine group (NH 2) in the range of 1,650 to 1,600 cm -1 decreases. Thus, the glycerol-based hybrid sludge shows a hydrophilic state and the molasses-based hybrid sludge turns into a hydrophobic form.

Hydrophobicity of hybrid sludge

In case of producing hybrid sludge, the method of treatment is different according to the type of the liquid biomass, and in the case of the molasses-based hybrid sludge, the moisture adsorption and the transportation cost are reduced due to the strong hydrophobicity of the surface.

In the case of the contact angle measurement shown in FIG. 14, the hydrophobicity of the surface was visualized. As a result, it can be seen that, in the case of the molasses-based hybrid sludge, the water is not absorbed and the shape of the water droplet is maintained as compared with the sewage sludge in which water is absorbed. Here, when the contact angle exceeds 70 degrees, it is said to be hydrophobic, and when the contact angle exceeds 150 degrees like a lotus leaf, it is called a super water-repellent surface. This hybrid sludge is characterized by strong hydrophobicity similar to lotus leaf. In addition, in the case of the extreme conditions shown in Fig. 15 (measurement of the internal moisture absorption rate of water) in the case of immersing in excess water (stirring after 20 minutes or more)), And shows the re-adsorption rate of water.

Therefore, the hybrid sludge according to the present embodiment can prevent the efficiency of the power plant due to moisture and the transportation cost from being increased.

It should be noted that the embodiments disclosed in the drawings are merely examples of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

Claims (15)

A method for producing a sewage sludge mixed fuel comprising a liquid biomass of any one of hydrophilic or hydrophobic liquid biomass,
Mixing a hydrophilic or hydrophobic liquid biomass with sewage sludge to form a mixture;
A second step of adding a binder to the mixture to form a mixed fuel;
A third step of drying the mixed fuel;
A fourth step of carbonizing when the vaporization temperature of the liquid biomass contained in the mixed fuel is higher than 105 ° C;
Wherein the liquid biomass comprises at least one of hydrophilic or hydrophobic liquid biomass.
The method according to claim 1,
Wherein in the first step, the liquid biomass comprises more than 0 to less than 100% by weight of the liquid biomass, and more than 0 to less than 100% by weight of the sewage sludge, and the hydrophilic or hydrophobic liquid biomass Wherein the method comprises the steps of:
The method according to claim 1,
The liquid biomass may be selected from the group consisting of ligno-cellulose and saccharides including enzymes of sucrose, maltose, lactose and starch, glucose and fructose, Characterized in that it comprises at least one of monosaccharide, glycerol and crude glycerol containing fructose and galactose, or hydrophilic biomass or palm oil, rapeseed oil, soybean oil, Which comprises at least one of all of vegetable oils including vegetable oil, jatropha oil, corn oil, coconut oil, sunflower seed oil, canola oil and all of its vegetable oil and its residues, all animal oils such as tallow and fish oil, Wherein the biomass comprises one or more liquid biomass.
The method according to claim 1,
And a fifth step of mixing coal powder with the mixed fuel. The method for producing a sewage sludge blended fuel according to claim 1, wherein the liquid biomass is at least one of hydrophilic and hydrophobic liquid biomass.
5. The method of claim 4,
The method according to claim 1, further comprising, in the fifth step, a coal powder in an amount of more than 0 to 50% by weight with respect to the mixed fuel, and the hydrophilic or hydrophobic liquid biomass Gt;
The method according to claim 1,
Characterized in that the sludge is a sludge containing any one or more of organic sewage sludge, organic wastewater sludge, inorganic sewage sludge, inorganic wastewater sludge, and / or hydrophilic or hydrophobic liquid biomass. Wherein the method comprises the steps of:
The method according to claim 1,
The method for producing a sewage sludge mixed fuel according to any one of claims 1 to 3, wherein the liquid biomass is at least one of hydrophilic and hydrophobic liquid biomass. .
The method according to claim 1,
Wherein the drying is performed at a temperature ranging from 80 ° C to 105 ° C in the third step. The method according to claim 1, wherein the liquid biomass is at least one of hydrophilic and hydrophobic liquid biomass.
The method according to claim 1,
Wherein the carbonization temperature in the fourth step is higher than 105 ° C and lower than 300 ° C. 2. The method according to claim 1, wherein the liquid biomass is at least one of hydrophilic and hydrophobic liquid biomass.
The method according to claim 1,
The binder may be an aqueous solvent such as pure water, fresh water, nordic acid, brine, or a mixture of alcohol and water in the form of water, and aliphatic hydrocarbons such as hexane; Aromatic hydrocarbons such as benzene, toluene, xylene and methylnaphthalene; Heterocyclic compounds such as quinoline and pyridine, ketones such as acetone, methyl ethyl ketone and cyclohexanone; Esters such as methyl acetate and methyl acrylate; Amines such as diethylenetriamine and N, N-dimethylaminopropylamine; Ethers such as diethyl ether, propylene oxide and tetrahydrofuran (THF); amides such as N-methylpyrrolidone (NMP), dimethylformamide and dimethylacetamide; A hydrophilic or hydrophobic liquid biomass characterized by containing at least one of an organic solvent such as an amphoteric polar solvent such as hexamethylphosphoric acid, A method of manufacturing a fuel.
6. The method of claim 5,
The method for producing a sewage sludge mixed fuel according to any one of claims 1 to 3, wherein the coal is any one or more selected from among peat, lignite, bituminous coal, bituminous coal, and anthracite coal or a hydrophilic or hydrophobic liquid biomass .
The method according to claim 1,
Wherein the mixed fuel is formed under a pressure condition of atmospheric pressure to 10 MPa. The method according to claim 1, wherein the liquid biomass is a hydrophilic or hydrophobic liquid biomass.
13. A sewage sludge blended fuel comprising at least one liquid biomass of hydrophilic or hydrophobic liquid biomass, which is produced by the method of any one of claims 1 to 12.
Characterized in that the combustion characteristics of the sewage sludge blended fuel are not independent combustion characteristics due to the mixing of the fuel with different reactivity, Wherein the liquid biomass comprises at least one of hydrophilic or hydrophobic liquid biomass, characterized by exhibiting combustion characteristics of a single fuel.
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