KR101445253B1 - Pulverized solid fuel comprising algae mass containing oil - Google Patents

Abstract

The present invention relates to an undifferentiated solid fuel, wherein undifferentiated algae masses containing oil have greater heating values during combustion, and can accordingly be used as an alternative economically friendly energy used in large boilers for plants requiring automatic control for combustion.

Description

PULVERIZED SOLID FUEL COMPRISING ALGAE MASS CONTAINING OIL <br> <br> <br> Patents - stay tuned to the technology PULVERIZED SOLID FUEL COMPRISING ALGAE MASS CONTAINING OIL

The present invention relates to a solid fuel which is obtained by micronizing an algae mass containing oil, more specifically, an oil-rich algae mass is pulverized, and an excellent calorific value during combustion is provided, thereby providing environmentally friendly alternative energy capable of replacing fossil fuels And to an undifferentiated solid fuel suitable for use in a large boiler for power generation that is undifferentiated and requires automatic control of combustion.

Alternative energy development is urgent due to the depletion of fossil fuels, rising energy demand, and high oil prices. Development of environmentally friendly alternative energy is a major global issue in response to global warming and various global environmental problems.

Renewable energy is being considered as the most realistic and promising alternative to solve these future energy shortages and greenhouse gas environmental problems at the same time. In particular, the Fukushima nuclear power plant accident caused by the Great East Japan Earthquake has emphasized the need for the development of clean and renewable energy more than ever.

There is a growing interest in marine biotechnology as a solution to these challenges.

Microalgae are photosynthetic underwater single-celled organisms, commonly referred to as phytoplankton. These microalgae are more than 220,000 species. If only water, sunlight, and carbon dioxide are supplied, they will be able to grow unlimitedly with photosynthesis. They can be mass-produced in a short time in various environments, and useful substances such as carbohydrates, proteins, and unsaturated fatty acids It is a rich eco-friendly resource.

Microalgae are currently considered as the most promising alternative sources with the following advantages: 1) Most microalgae varieties can be cultivated in salt-free land that can not be cultivated, and massive microalgae cultivation does not add any additional burden to food production . 2) Microalgae act as an effective carbon capture platform due to the high photosynthetic rate due to the unicellular structure and can accumulate up to 77% of dry cell mass in biomass. 3) According to conservative estimates, biodiesel production is 10 times smaller per unit area of land than in typical oil-bearing crops in microalgae.

Algae, on the other hand, refers to a group of lower plants that consist of proteins, carbohydrates, fats, etc. and are cultured in water. These algae are generally referred to as microalgae described above and are cultured through photosynthesis in the sunlight.

Studies are underway to produce alternative energy through the use of algae oil extracted from the algae, according to the characteristics of rapid growth and reproduction of these species and their ability to grow smoothly in freshwater or seawater, regardless of the culture place.

The prior art regarding fuels using these microalgae and biomass is as follows.

Korean Patent No. 1354176 discloses a first heating process (S10) for heating the microalgae until water contained in the microalgae is phase-changed into water vapor. A first biofuel producing process (S20) of reacting steam separated from the microalgae by the first heating process (S10) with hydrocarbons to produce hydrogen; A second heating step (S30) of heating the microalgae until the oil contained in the microalgae is vaporized after the first heating step (S10); And a second biofuel production process (S40) for producing biodiesel by reacting the vaporized oil separated from the microalgae with the alcohol by the second heating process (S30). In the second heating process (S30) Wherein the heat of the water vapor separated by the first heating step (S10) is used in the third biofuel production step (S50) of producing biodiesel and hydrogen by pyrolyzing the microalgae separated by the oil by the first heating step Discloses a biofuel production method using algae.

On the other hand, there are four methods of burning these fuels. Stoker, pulverized coal, fluidized bed, fluidized combustion system and so on.

In the case of the pulverized coal combustion method, the pulverized coal having a particle size of 200 mesh or less is injected into the combustion chamber together with the air, and the coal is burned. Due to the necessity of the large amount of coal combustion and the rapid automatic control, .

The prior art using this pulverized coal combustion system is as follows.

Korean Patent Publication No. 2000-0062699 discloses a pulverized coal combustion burner comprising a pulverized coal nozzle for pulverizing a mixture of pulverized coal and air, and an air nozzle for ejecting air, wherein a sufficient amount of air The pulverized coal is burned to rapidly burn the pulverized coal in the vicinity of the outlet of the burner to form a high temperature flame and rapidly consume oxygen so that the amount of air required to completely combust the components discharged as gas from the pulverized coal at high temperature And the air ejected from the air nozzle at the downstream side of the high-temperature reducing flame is mixed to form an oxidizing flame having a uniform gas composition distribution in the radial direction with respect to the central axis of the burner (Which completely burns the components emitted as gas from the pulverized coal A flame having a ratio of an actual amount of air to an amount of air required to be larger than 1) is formed.

The inventors of the present invention have developed a solid fuel which is not mentioned in the above-mentioned prior art and can be used as a substitute for fossil fuel, and can provide environmentally friendly alternative energy. And it is also suitable for pulverized coal combustion systems used in a large boiler, thus completing the present invention.

Accordingly, an object of the present invention is to provide an undifferentiated solid fuel that can be utilized as an environmentally friendly alternative energy that can meet energy demand by replacing fossil fuels.

Another object of the present invention is to provide an undifferentiated solid fuel suitable for a pulverized coal combustion system used in a large boiler for power generation.

In order to achieve the above object, the present invention provides an undifferentiated solid fuel having a particle size of 0.04 to 0.5 mm by micronizing the oil-containing algmith.

In the present invention, it is preferable to use algae which has an oil content of 60 to 80% extracted from algae as the oil containing algae mass.

The present invention provides an environmentally friendly and calorific amount of algae mass containing oil capable of mass production in a short time in a variety of environments with photosynthesis by supplying only carbon dioxide, It is possible to provide an undifferentiated solid fuel suitable for the pulverized coal combustion method of a large-sized power generating boiler.

Also, the material formed by burning the solid fuel in which the oil-containing algae mass according to the present invention is pulverized is rich in nitrogen, phosphorus, and potassium, and can be used as a raw material for the fertilizer.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and should be construed in accordance with the technical meanings and concepts of the present invention.

The embodiments and drawings described in the present specification are preferred embodiments of the present invention and are not intended to represent all of the technical ideas of the present invention, so that various equivalents and modifications may be substituted for them at the time of application of the present invention.

The particle size of the undifferentiated solid fuel according to the present invention is preferably milled to a size of 0.04-0.5 mm which is suitable for pulverized coal. More preferably, the pulverized coal is preferably pulverized to a particle size of 0.04 to 0.2 mm. And more preferably 0.04 to 0.08 mm. When the particle size of the pulverized coal is 0.04 mm or less, the particle size is too small and the energy efficiency is reduced by about 5% compared with the energy efficiency of 0.4 mm or more. When the particle size of the pulverized coal is 0.08 mm or less, the energy efficiency is about 3% The particle size of the pulverized coal is 0.04 mm to 0.08 mm, which is the optimum particle size.

The algae used in the present invention may be an oil-containing algae which is usually obtained in the technical field of the present invention.

The algae contain 30% to 80% of the body oil, and the algae oil used in the present invention refers to the algae oil extracted from such algae.

The algae mass of the present invention means a generic term for oil and algae produced by harvesting and drying algae containing carbon dioxide and light produced through photosynthesis . An algae mass is a state in which oil is contained in the agglomerates of the pre-stage before the oil is extracted from the dried algae mass.

The algae mass used in the present invention preferably has an oil content of 60 to 80%, which is preferable for a high calorific value.

The undifferentiated solid fuel according to the present invention can be produced according to the following steps.

The algae grown by supplying carbon dioxide, nutrients and sunlight is harvested and dried (step S1), and then the dried algae is extruded at a high temperature to produce a pellet (step S2) . The algae dried in step S1 or S2 preferably contains about 60 to 80% of oil, which is preferable for emitting a high heat source. The step (S2) may be followed by the step (S3) of pulverizing the produced pellets to produce a non-pulverized solid fuel.

Since the undifferentiated solid fuel according to the present invention is manufactured such that the particle size is 0.04-0.5 mm, it can exhibit a calorific value such that it can be used in a boiler for pulverized coal power generation using the bituminous coal. More preferably, the pulverized coal is preferably pulverized to a particle size of 0.04 to 0.2 mm. And more preferably 0.04 to 0.08 mm. When the particle size of the pulverized coal is 0.04 mm or less, the particle size is too small and the energy efficiency is reduced by about 5% compared with the energy efficiency of 0.4 mm or more. When the particle size of the pulverized coal is 0.08 mm or less, the energy efficiency is about 3% The particle size of the pulverized coal is 0.04 mm to 0.08 mm, which is the optimum particle size.

Example  One

1 kg of oil-containing algae mass (60% oil content) was dried in a dryer. Thereafter, the pellets were compressed at a pressure of 300 kgf / cm &lt; ² &gt; at 150 DEG C to produce pellets. The pellets were then charged into a crusher and crushed to a particle size of 0.04 to 0.5 mm to prepare undifferentiated solid fuel

Comparative Example  One

The size of the bituminous coal was pulverized to 0.04 to 0.5 mm to prepare a solid fuel.

Test Example  1 - Calorimetric test for undifferentiated solid fuel

The undifferentiated solid fuel produced in Example 1 was supplied to a pulverized coal-fired boiler together with air and burned. The temperature rise during the heating was measured using a bomb-type manual calorimeter, and the calorific value was measured by measuring kcal for 1 kg of the sample. Respectively.

Example 1 Calorific value (kcal / kg) 6,761

Referring to Table 1, it can be seen that the calorific value of the undifferentiated solid fuel produced according to Example 1 prepared according to the present invention significantly exceeds the standard of 4,500 kcal / kg of the quality standard.

Test Example  2 - Algiers  Measurement of calorific value by oil content

The caloric value according to the oil content of the algae was measured based on the caloric value of carbohydrate of 4.2 Kcal / g and the calories of lipid of 9.4 Kcal / g, and is shown in Table 2 below.

Algin oil content (%) 30% 40% 50% 60% 70% 80% Calorie value
(kcal / g) 5.8 6.3 6.8 7.3 7.8 8.4

Referring to Table 2, it can be seen that it is preferable to use aligmase having an oil content of 60% to 80% in terms of calorific value.

Test Example  3 - Calorific value measurement of undifferentiated solid fuel

The calorific value of the undifferentiated solid fuel prepared according to Comparative Example 1 was measured as in Test Example 1, and as a result, the calorific value of the undifferentiated solid fuel prepared according to Comparative Example 1 was 6,984 kcal / kg.

As described above, it can be seen that the calorific value of the undifferentiated solid fuel according to the present invention can show a calorific value similar to that of the pulverized coal made of the bituminous coal ordinarily used.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

Claims (11)

An undifferentiated solid fuel having an oil content in an oil content of 60 to 80% derived from algae and finely dividing the algae mass into 0.04 to 0.5 mm in particle size.
delete The method according to claim 1,
And a particle size of 0.04 to 0.2 mm.
The method according to claim 1,
And a particle size of 0.04 to 0.08 mm.
delete A fertilizer comprising ash remaining after burning the undifferentiated solid fuel according to any one of claims 1, 3 or 4.
Drying the aligmase containing oil having an oil content of 60 to 80% extracted from the algae (step S1);
A step of extruding the dried material at high temperature to produce a pellet (step S2); And
Crushing the pellet so as to have a particle size of 0.04 to 0.5 mm (step S3);
&Lt; / RTI &gt;
delete 8. The method of claim 7,
Wherein the pellet is pulverized so as to have a particle size of 0.04 to 0.2 mm.
8. The method of claim 7,
Wherein the pellet is pulverized so as to have a particle size of 0.04 to 0.08 mm.






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