KR101367146B1 - A Device for air cooled bed soil in use with bottom ash - Google Patents

Abstract

The present invention relates to a dry particle size selection technology for agricultural top soil utilization of air-cooled coal-fired flooring, comprising: a primary screening unit for selecting bottom ash which is a residue of coal combustion; A first transfer device for transferring the bottom ash selected by the primary selection unit while cooling with air; A grinder for crushing the bottom ash transferred from the first transfer device; A second transfer device for transferring the bottom ash pulverized in the crusher while cooling with air; A first storage for storing the bottom ash transferred from the second transfer device; A second sorting unit to sort the bottom ash transferred to the first storage; A second storage unit having a dust collecting filter in the unit and storing the bottom ash selected by the secondary sorting unit; A granularity sorting unit for selecting a particle size by receiving a bottom ash stored in the second storage; An acidity treatment unit for adjusting the acidity of the bottom ash selected by the size selection unit to between 6 and 9; It provides bituminous coal bottom ash processing equipment for agricultural aggregates, including, because it does not use water as a coolant, there is no residual waste such as sludge, it is environmentally friendly, and complete sterilization through reversing process for agriculture, civil engineering It can be used as aggregate for building and construction, and because it goes through reversing process, it is possible to achieve maximum energy efficiency through heat recovery and reduce the amount of unburned carbon to achieve environmental pollution.

Description

Drying particle size sorting device for agricultural top-level application of air-cooled coal-fired flooring {A Device for air cooled bed soil in use with bottom ash}

The present invention relates to a dry particle size selection technology for agricultural top-level utilization of air-cooled coal-fired flooring.

At present, human beings are faced with problems such as water shortages due to global warming, abnormal climate, food crisis and energy exhaustion.

The explosion of energy demand due to industrialization and the mass use of coal fossil fuels led to environmental problems such as the mass production of coal combustion wastes, and techniques for treating or utilizing coal combustion wastes appeared.

Coal ash is generally divided into fly ash and bottom ash by the source of occurrence.

Bottom ash is attached to the boiler furnace wall, superheater, reheater, etc. of the power plant, and falls to the bottom of the boiler by its own weight.

Generally, the particle size of bottom ash is mostly less than 30 mm, most of which is discarded in Ash Pond, and the recycling rate is extremely low.

Bottom ash causes many problems such as disposal of landfill in landfill site through simple landfill. In particular, disposal through landfill is incompatible with the efficient use of land there is a problem.

Therefore, there is a growing need for recycling of bottom ash, which is increasing in quantity and amount of landfill each year.

In particular, agricultural aggregate refers to granular inorganic minerals such as sand, gravel, pearlite, vermiculite and the like used in agriculture.

Among the conventional technologies, the inflatable treatment technology naturally mines pearl rock, vermiculite, etc. As a technology used for agricultural aggregates, energy consumption is high and includes a large amount of harmful heavy metal materials, and particularly, there is a problem that can contain a large amount of asbestos.

In the past, there existed technologies for manufacturing expanded lightweight aggregate processed by pearl rock and vermiculite and particle size selection technology for washing water-cooled coal ash.However, in the manufacturing process, the discharge of harmful substances such as asbestos, which are fatal to the human body, and excessive energy input in manufacturing A problem existed.

Conventional coal ash treatment technology has different chemical characteristics of coal ash by coal type and mine, and the combustion method is different from fluidized bed combustion method or pulverized coal combustion method in the process of combustion. There was a problem that the mass production of recycled products and physical and chemically standardized coal ash is difficult because the back is not uniform.

Conventionally, there has been a water-cooled wet treatment technique as one of treatment techniques for using coal ash.

Conventional water-cooled wet method technology, water-cooled wet technology dumps the residue in the water during coal combustion, water cooled, transferred to landfill using sea water, washed with fresh water, and then separated by vibrating body using a particle size car for civil engineering, It was a technology used as aggregate for construction.

Since the conventional water-cooled wet method uses water for cooling the coal ash, the operation cost for the water treatment facility is excessive, and there is a problem of sludge generation through water treatment.

In other words, in the case of cooling by using sea water, coal ash contains salt and there is a problem that is not suitable for agriculture because sterilization is not performed.

In another conventional technology, pearlite, vermiculite, etc. were transported by ship after mining, transported by land, and then introduced into a expansion furnace heated to about 1,000 degrees Celsius to expand and commercialize, but this leads to products. The process was complicated and energy consumption, air pollutant emissions and asbestos emissions were many problems.

In particular, the conventional water-cooled coal ash desalination technology has a problem in that sludge is generated in the operation of water treatment facilities because water is used, various microbial weed seeds, etc. are introduced, and the treatment facilities are complicated and there are many disadvantages of using electricity. .

The conventional water-cooled coal ash desalination technology requires seawater separately because it uses seawater, and has a disadvantage of being unsuitable for agriculture due to the non-sterile output containing salt.

 Therefore, the present invention has been made to solve the above-mentioned problems, by providing a dry particle size selection technology for the agricultural top-level utilization of air-cooled coal-fired flooring materials to simplify the treatment facilities and recycle the coal waste to safe and secure food from meteorological natural disasters The objective is to provide stable production tools and provide agricultural aggregates, soil improvement and seedling tops and artificial culture soils or soil improvers that are bonded to agricultural aggregates in a completely sterilized state.

In order to solve the above problems, the present invention, the primary screening unit for selecting the bottom ash which is a residue of coal combustion; A first transfer device for transferring the bottom ash selected by the primary selection unit while cooling with air; A grinder for crushing the bottom ash transferred from the first transfer device; A second transfer device for transferring the bottom ash pulverized in the crusher while cooling with air; A first storage for storing the bottom ash transferred from the second transfer device; A second sorting unit to sort the bottom ash transferred to the first storage; A second storage unit having a dust collecting filter in the unit and storing the bottom ash selected by the secondary sorting unit; A granularity sorting unit for selecting a particle size by receiving a bottom ash stored in the second storage; An acidity treatment unit for adjusting the acidity of the bottom ash selected by the size selection unit to between 6 and 9; Bituminous coal bottom ash processing apparatus for agricultural aggregates, characterized in that it comprises a.

In addition, the particle size selection unit, the bottom ash supplied from the second reservoir according to the size of the particles, the first sieve for separating the particle size of the bottom ash supplied from the second reservoir exceeds 8 millimeters; A second sieve network for separating the particle size of the bottom ash supplied from the second reservoir more than 4 millimeters and not more than 8 millimeters; A third sieve network for separating the particle size of the bottom ash supplied from the second reservoir more than 1 millimeter and not more than 4 millimeters; A bottom portion guiding that the particle size of the bottom ash supplied from the second reservoir is 0.1 mm or more and 3 mm or less; Bituminous coal bottom ash processing apparatus for agricultural aggregates, characterized in that consisting of.

In addition, the second reservoir includes a bituminous coal bottom ash processing apparatus for agricultural aggregates, characterized in that it has a quantitative supply unit to quantitatively supply the bottom ash stored in the second reservoir to the particle size selection unit.

According to the present invention as described above, the following effects can be obtained.

First, since there is no residual waste such as sludge because water is not used as a coolant, there is an advantage that it is suitable for agriculture because it is environmentally friendly.

Second, because it is completely sterilized, there is no contamination of weed seeds or microorganisms, so additional disinfection is unnecessary, and it helps to improve plant immunity. It has the advantage that it can be used as aggregate for agriculture, civil engineering, and building.

Third, since the bottom ash from which unburned carbon is separated is separated by particle size, there is an advantage that it can be used as a suitable vulcanized aggregate according to the use place such as water clay, compost manufacturing water control agent, horticultural soil, hydroponic carrier and landscaping aggregate.

Fourth, the large porosity is more than 50% has the advantage of excellent ventilation and drainage performance.

Fifth, there is an advantage that the effective moisture content is excellent and excellent water retention.

Sixth, there is an advantage of excellent retention of fertilizer components.

1 is an overall view according to a preferred embodiment of the present invention.
2 is a view illustrating a particle size selection unit according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

1 is an overall configuration diagram according to a preferred embodiment of the present invention.

Bottom ash is produced after pulverized input combustion by mixing various kinds of coals with various calorific value, chemical composition, sulfur content, melting point, etc. in a boiler, and quality, that is, pH, physical properties, characteristics, etc. are varied.

The first screening unit 100 grasps the coal ash content 12 hours before the coal burns dry coal ash suitable for utilizing the bottom ash in the agricultural field, and predicts the coal ash quality according to the coal composition.

Mixed coal is injected into the furnace to combust and generate bottom ash.

The bottom ash is primarily loaded by the first conveying apparatus 110 and conveyed by air and enters the grinder 111 to be crushed.

The crushed bottom ash is again transferred to the second transfer device 120, and secondarily cooled by air and transferred to the first reservoir 121.

The first reservoir 121 also serves to absorb the impact so that the bottom ash transferred from the second transfer device 120 is less impacted.

The bottom ash that passed through the first reservoir 121 is visually inspected in the secondary sorting unit 123, that is, the color ash and melt state, pH test, specific gravity, etc. are not suitable for farming, and the bottom ash is a landfill. The transfer will be determined.

The bottom ash, which is determined to be suitable for farming, is transferred to the second storage 200 through the secondary screening unit 123.

The dust collecting filter 210 is installed above the second storage 200 to suppress dust generated when the bottom ash is transferred from the secondary sorting unit 123 to the second storage 200.

The fixed amount supply unit 220 is installed below the second reservoir 200 and consists of a rotary feeder.

The quantitative supply unit 220 serves to quantitatively supply the bottom ash stored in the second storage 200 to the particle size selection unit 300.

The particle size selection unit 300 selects the bottom ash in a total of four stages from 0.1 mm to 2 mm, 1 to 4 mm, 4 to 8 mm, and 8 mm or more according to the particle size of the bottom ash quantitatively supplied from the second reservoir 200. .

In more detail, Figure 2 is an enlarged view of the particle size selection unit 300 according to a preferred embodiment of the present invention.

The particle size selection unit 300 is provided with an inlet for receiving the bottom ash quantitatively supplied from the second reservoir 200 in the upper left.

A vibrator for vibrating the bottom ash is provided below the particle size selector 300.

A total of three manure screens are installed inside the particle size selection unit 300, and the first network, the second network, and the third network are installed at regular intervals from top to bottom.

The first network, the second network, and the third network are all through the bottom to have a certain diameter, the first network has a larger hole than the second network, the second network has a larger hole than the third network have.

In other words, the bottom ash that enters the inlet of the particle size selection unit 300 has the largest particle size in the first sieve network, is moved to the right side by the vibration of the vibrator, and discharged to the first discharge port, and the smallest particle size is the bottom. The ash passes through the third body network to the bottom surface and is discharged to the fourth discharge port by the vibration of the vibrator.

The right end of the particle size selection unit 300 has a first discharge port is connected to the right end of the first network so that the particles do not pass through the first network, the second to discharge particles that do not pass through the second network A second discharge port is provided to be connected to the right end of the body network.

The third discharge port is installed in the vertical lower direction at the lower right end of the particle size selection unit 300 so that particles that do not pass through the third sieve network are discharged, and the fourth discharge hole has the particle sifting unit 300 passing through the third sieve network. It is installed on the left side of the third discharge port so as to be discharged by the vibration of the barbator from the bottom surface of the.

In more detail, the first sieve filters out the particle size of the bottom ash exceeding 8 millimeters, and the second sieve filters out the particle size of the transferred bottom ash exceeding 4 millimeters and less than 8 millimeters.

The third network filters out the particle size of the transferred bottom ash exceeding 1 millimeter and less than 4 millimeters, and on the bottom surface, the bottom ash has a particle size of 0.1 millimeter or more and 3 millimeters or less.

Bottom ash selected according to the particle size in the particle size selection unit 300 is adjusted to pH 6 to 9 in the acidity control unit 400, wherein 1N (normal concentration) of phosphoric acid, nitric acid may be used.

The acidity-adjusted bottom ash is finally packaged on the ton mat in the packaging unit 500 and commercialized.

Next, a processing method according to a preferred embodiment of the present invention will be described in detail.

3 is a process diagram according to a preferred embodiment of the present invention.

First, in order to predict the quality of bottom ash generated after combustion by mixing various kinds of coals with different calorific value, chemical composition, sulfur content, melting point, etc. in a certain quality, the ash ash content before combustion and the bottom ash according to the mixture composition The prediction step (S1) to predict the quality of the.

Next, the dry bottom ash from the first reservoir 121 is collected and visually inspected for chromaticity or melting state, and pH, specific gravity, etc. are carefully selected, and the bottom ash of appropriate quality is carefully selected to transfer the inappropriate bottom ash to a landfill. Go through step S2.

Next, go through the weighing step (S3) for storing and loading the dry bottom ash.

Next, in the particle size selection section, it is selected that more than 8 millimeters and more than 8 millimeters, more than 4 millimeters and more than 4 millimeters, and more than 1 millimeter and less than 4 millimeters, and more than 0.1 millimeters and less than 3 millimeters, depending on the size of the bottom ash particles. To undergo the selection step (S4).

Next, the acidity adjustment step (S5) of adjusting the acidity of the bottom ash to 6-9 using 1N (normal concentration) phosphoric acid and nitric acid is performed.

Finally, the product goes through the packing step (S6) of packing on the ton mat.

The present invention is configured as described above, and the present invention is not necessarily limited to the following embodiments in view of the object and technical idea of the present invention, and the level of skill that can be easily created from the present invention is not limited to the present invention It is to be understood that the present invention is not limited by the scope of the present invention and that the present invention can be applied to various types of products, such as a level of commercial design change, a shape change, a material change, I do not mention anything about technology.

100: primary separation unit 110: first transfer device
111: grinder 120: second feeder
121: First storage 123: Secondary sorting unit
200: second storage 210: dust collecting filter
220: fixed-quantity supply unit 300: particle size selection unit
301: first discharge outlet 302: second discharge outlet
303: third discharge outlet 304: fourth discharge outlet
310: first network 320: second network
330: third network 340: floor surface
350: vibrator

Claims (3)

A primary screening unit for selecting bottom ash which is a residue of coal combustion;
A first transfer device for transferring the bottom ash sorted by the primary sorting unit while cooling with air;
A grinder for crushing the bottom ash conveyed from the first conveying apparatus;
A second transfer device which transfers the bottom ash pulverized in the crusher while cooling with air;
A first storage for storing the bottom ash transferred from the second transfer device;
A secondary sorting unit to sort the bottom ash transferred to the first storage;
A second storage unit having a dust collecting filter at an upper portion thereof and storing a bottom ash selected by the secondary sorting unit;
A granularity sorting unit for selecting a particle size by receiving the bottom ash stored in the second storage;
An acidity treatment unit for adjusting the acidity of the bottom ash selected by the particle size selection unit between 6 and 9;
Bituminous coal bottom ash processing apparatus for agricultural aggregates comprising a.

The method of claim 1,
The particle size selection unit,
The bottom ash supplied from the second reservoir is separated according to the size of the particles,
A first sieve separating the particle size of the bottom ash supplied from the second reservoir exceeding 8 millimeters;
A second sieve network for separating the particle size of the bottom ash supplied from the second reservoir more than 4 millimeters and not more than 8 millimeters;
A third sieve network for separating the particle size of the bottom ash supplied from the second reservoir more than 1 millimeter and not more than 4 millimeters;
A bottom portion guiding that the particle size of the bottom ash supplied from the second reservoir is 0.1 mm or more and 3 mm or less;
Bituminous coal bottom ash processing apparatus for agricultural aggregates, characterized in that consisting of.

The method of claim 1,
The second reservoir,
Bituminous coal bottom ash processing device for agricultural aggregates characterized in that it has a quantitative supply unit to quantitatively supply the bottom ash stored in the second reservoir to the particle size selection unit.

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