KR102321056B1 - Sand production method for mortar using a sintering furnace combined with a rotary kiln furnace and a fluidized bed furnace - Google Patents

Abstract

The present invention relates to a sand production method for mortar using a sintering furnace in which a rotary kiln furnace and a fluidized bed furnace are combined, which comprises: a recycled fine aggregate supply step; a mixed waste supply step; a recycled aggregate and mixed waste supply step; a primary sintering step; a secondary sintering step; a sintering step; a waste heat supply step; a heat exchange step; a dust collection step; a gas dust collection step; a white smoke prevention step; and a discharge step. According to the present invention, sand for mortar having excellent quality can be produced.

Description

TECHNICAL FIELD [0002] Sand production method for mortar using a sintering furnace combined with a rotary kiln furnace and a fluidized bed furnace

The present invention relates to a method for manufacturing sand for mortar using a calcination furnace in which a rotary kiln furnace and a fluidized bed furnace are combined. After drying and gasification at an operating temperature exceeding the ignition temperature of the waste to be combusted by maintaining the interior at about 600-800°C, the rotary kiln furnace is combined with the fluidized bed furnace on the side of the fluidized-bed furnace with circulating fine aggregates of 4.5 mm or less in the calcination furnace. Combustible waste crushed to a size of 20 mm or less is continuously input as a heat source fuel for calcination, and recycled fine aggregates of 4.5 mm or less in the primary rotary killer furnace also act as a fluid medium, and primary heating and calcination for mortar sand products Combustible waste crushed to a size of less than 20mm is burned and incinerated to become a heat source for firing. The ash and fine dust remaining in the secondary fluidized bed furnace for circulating fine aggregates of 4.5 mm or less heated and calcined in the rotary killer furnace are all together with the exhaust gas at the top by the equal flow effect of the fluidized medium (circulated fine aggregates of 4.5 mm or less). It is discharged to the gas flow path, and at this time, urea water is sprayed and sprayed to treat nitrogen oxides inside the fluidized bed furnace, so it has a SNCR (nitrogen oxide treatment facility) function. Circulating fine aggregate of 4.5mm or less is accumulated on the diffuser plate and flows by the pressure and speed of the heated pressure air ejected from the fluidized air nozzle. Continuously discharged, rapid cooling, grinding, pumping, crushing, sorting, re-grinding, classification, washing, dewatering, water treatment, dewatering, sludge cake formation, and waste heat recycling to dry cakes to recover cement and produce sand for recycling and mortar It relates to a method for producing sand for mortar using a kiln in which a rotary kiln furnace and a fluidized bed furnace are combined.

Korea’s construction waste generation amounted to 414,626 tons/day in 2017, of which 53,490 tons/day, domestic waste, 164,874 tons/day, construction waste, 196,262 tons/day, construction waste, 12.9% of household waste, 12.9% of industrial waste 39.8% of facility waste and 47.3% of construction waste.

The amount of household waste generated per person is 1.01kg/day. Industrial waste is the largest in the manufacturing industry at 98,477 tons/day. Among household wastes, combustible waste was generated 24,638 tons/day in 2017, combustible wastes from the plant discharge system generated 40,137 tons/day in 2017, and combustible wastes among construction wastes were generated at 2,614 tons/day in 2017, and the status of waste treatment As of 2017, the landfill rate was 7.8%, the incineration rate was 5.8%, and the recycling rate was 86.4%, an increase of 0.7% compared to the previous year.

Disposal status by subject of waste treatment In 2017, local governments 9.6%, treatment companies 81.7%, self-treatment 8.7%, among which, the status of treatment by subject of household waste was 64.9% by local governments, 34.5% treatment companies, 0.6% self-treatment, and plant discharge system Waste is 1.5% by local governments, 77.4% by processing companies, 21.1% by self-treatment, 1.4% by municipalities for construction waste, 98.2% by processing companies, and 0.41% by self-treatment.

There are a total of 395 incineration facilities as of 2017, with a capacity of 32,083 tons of incineration per day. The composition of waste plastic products is thermoplastic resin, and as of 2001, more than 4 million tons were generated annually.

Combustible waste generated from construction waste is waste wood, waste synthetic resin, waste fiber, rubber, and waste wallpaper, and non-combustible waste is waste concrete, waste brick, waste asphalt, waste blocks, waste waste, construction waste soil, construction sludge, and waste metals. , waste glass, waste tiles, and waste ceramics, and combustible and non-combustible mixed wastes are classified as waste boards, waste panels, other combustible domestic and industrial wastes, and other wastes from construction work.

The amount of combustible waste recycling is increasing because it is used as an auxiliary fuel when burning raw materials in cement plants.

Although there are environmental controversies, incineration ash is also recycled as an auxiliary material for cement, and there are various recycling studies.

However, recycled aggregate recycling treatment of crushed construction waste does not follow the throughput, so recycled aggregate is accumulated, exceeding the allowable storage amount, resulting in lower economic feasibility of the company, and the problem of recycling, but there is no clear alternative.

However, the recycling of recycled aggregates generated from these construction wastes and the recycling of combustible mixed waste, combustible household waste, and industrial waste as fuel to solve environmental problems and to increase economic value by turning energy resources into energy resources expand the scope of industrial use and recycling. We aim to solve environmental problems by securing diversity in technology.

[Patent Document 1] Patent Publication No. 2017-0004241 (published on Jan. 11, 2017) [Patent Document 2] Patent Registration No. 0529690 (Registered on November 11, 2005) [Patent Document 3] Patent Registration No. 0383569 (Registered on April 29, 2003) [Patent Document 4] Patent Registration No. 1005622 (Registered on December 27, 2010)

Therefore, it was devised to solve these conventional drawbacks, and the solution of the present invention is to produce recycled fine aggregates of 4.5 mm or less from crushed waste concrete in the characteristic of a kiln in which a rotary kiln furnace is combined with a fluidized bed furnace on the side of the fluidized bed furnace. It acts as a fluidized medium and is recycled as sand for mortar, and at the same time, combustible waste crushed to 20mm or less is recycled as an auxiliary fuel. The purpose of this is to recover and recycle cement by using recycled fine aggregates of 4.5 mm or less as a fluid medium and firing them at the same time to produce sand for mortar.

Another problem to be solved in the present invention is that, in a general fluidized bed furnace, when the fluidized medium is filled, it is necessary to prevent the fluidized medium from being lost in the fluidized bed area, but, unlike this, it also functions as a fluidized medium and recycled fine aggregates of 4.5 mm or less are fired and recycled as sand for mortar. Since it is a reproductive product, it is a characteristic that it must be continuously input and continuously discharged, so it aims to provide a kiln composed of a primary rotary kiln furnace and a fluidized bed furnace on the side of the fluidized bed furnace.

Another solution to the present invention is to recycle fine circulating aggregates of 4.5 mm or less from crushed waste concrete as a fluid medium, and at the same time recycle combustible waste crushed to 20 mm or less as an auxiliary fuel so that the rotary kiln furnace is placed on the side of the fluidized bed furnace. For mortar with excellent quality by recycling and using recycled fine aggregates of 4.5 mm or less as a fluid medium function as a fuel, which is the heat source of a kiln constructed in combination with a fluidized bed furnace, and simultaneously calcining to recover and recycle cement and produce sand for mortar. The purpose is to provide sand.

The present invention comprises: a recycled fine aggregate supply step in which a recycled fine aggregate of 4.5 mm or less is stored and supplied;
A mixed waste supply step of storing and supplying combustible waste crushed to a size of 20 mm or less;
a recycled aggregate and mixed waste supply step of receiving and mixing the recycled fine aggregate and combustible waste;
a primary firing step of recycling fine circulating aggregates of 4.5 mm or less from the supply tank as a fluid medium, and heating and firing combustible waste crushed to 20 mm or less into recycled fuel as auxiliary fuel;
The rotary kiln furnace of the first firing step is connected, and an acid substrate is installed on the lower side, and heating pressure air is supplied from the multi-step centrifugal blower, so that combustible waste is burned and incinerated. a second firing step of firing;
a firing step of installing a combination of the first firing step and the second firing step to be fired;
a waste heat supply step of installing a waste heat boiler above the fluidized bed furnace of the secondary firing step;
a heat exchange step of installing a heat exchanger to supply steam heat and heat medium oil heat;
It is characterized in that it consists of a dust collection step of recovering ash and fine dust, a gas dust collection step of removing fine particles and acid gas, a white smoke prevention step and a discharge step.

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The present invention is a kiln in which a rotary kiln furnace is combined with a fluidized bed furnace on the side of the fluidized bed furnace. Combustible wastes that are recycled into sand and crushed to a size of 20 mm or less are recycled as auxiliary fuel, and the rotary kiln furnace is recycled as a fuel, which is the heat source of the kiln constructed in combination with the fluidized bed furnace on the side of the fluidized bed furnace, and recycled fine aggregates of 4.5 mm or less are flowed. As a medium function, it is fired at the same time as it is used, so that the cement is recovered and recycled, and the effect of manufacturing and supplying sand for mortar, a product, is provided.

According to the present invention, the general fluidized bed furnace must prevent the fluidized medium from being lost in the fluidized bed area when the fluidized medium is filled. However, unlike this, it is used as a fluidized medium and at the same time, recycled fine aggregates of 4.5 mm or less are fired and recycled. Since it is a characteristic that must be discharged, it is effective to provide a kiln in which the primary rotary kiln furnace is combined with the fluidized bed furnace on the side of the secondary fluidized bed furnace.

According to the present invention, recycled fine aggregates of 4.5 mm or less from crushed waste concrete act as a fluid medium, and recycled fine aggregates of 4.5 mm or less are fired as recycled products as sand for mortar, and at the same time, combustible waste crushed to 20 mm or less is used as an auxiliary fuel. By recycling the rotary kiln furnace as a fuel, which is the heat source of the kiln constructed in combination with the fluidized bed furnace on the side of the fluidized bed furnace, recycled fine aggregates of 4.5 mm or less are used as a fluid medium and fired at the same time to recover and recycle cement, and to use the product, sand for mortar. By manufacturing, there is an effect of manufacturing and providing sand for mortar with excellent quality.

1 is an installation state diagram showing a preferred embodiment of the present invention;
Figure 2 is a main part installation state diagram for Figure 1 of the present invention;
3 is an installation state diagram showing another embodiment of the present invention;
Figure 4 is a main part installation state diagram for Figure 3 of the present invention;
5 is an installation state diagram showing another embodiment of the present invention;
Figure 6 is a main part installation state diagram for Figure 5 of the present invention;
7 is a block diagram showing an embodiment of FIG. 1 of the present invention;
8 is a block diagram showing an embodiment of FIG. 3 of the present invention;
9 is a block diagram showing an embodiment of FIG. 5 of the present invention;

With respect to the embodiments of the present invention published in the text, specific structural or functional descriptions are only exemplified for the purpose of describing the embodiments of the present invention, and the embodiments of the present invention may be embodied in various forms. It should not be construed as being limited to the embodiments described in .

Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, similar reference numerals are used for components.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

When a component is referred to as being “connected” or “installed” with another component, it may be directly connected to or installed on the other component, but it is understood that other components may exist in between. it should be

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In this application, terms such as "comprises" or "have" are intended to designate the presence of the specified feature, number, step, action, component, part, or a combination thereof, but one or more other It is to be understood that this does not preclude the possibility of the presence or addition of features or numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

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

Recycling recycled fine aggregates of 4.5 mm or less from crushed waste concrete as a fluid medium, and at the same time recycling and recycling combustible waste crushed to 20 mm or less as auxiliary fuel in the firing process. It is to manufacture sand for mm mortar.

In the recycled aggregate manufacturing process, recycled fine aggregates of 4.5 mm or less produced dry or wet by mixing recycled aggregates of 13 mm or less, waste casting sand, and dried sewage sludge are used as raw materials for recovering and recycling cement and manufacturing sand for mortar. ) is sent to the supply tank 20 through the circulating fine aggregate supply step (S10) stored in the circulating aggregate and the mixed waste supply step (S20), and then the rotary kiln furnace 30 and the fluidized bed furnace 40 are combined on the side. It is made to be put into the calcination furnace 100,

At the same time, combustible mixed wastes, industrial wastes, combustible household wastes and non-combustible wastes mixed with some in the collection process and properties without classification and sorting processes (self-selection for scrap metal and manual selection for non-ferrous metals) After crushing to the standard, it is sent to the supply tank 20 through the mixed waste supply step (S20) that is stored in the waste fuel conversion tank 11, and then sent through the recycling aggregate and mixed waste supply step (S20) with the rotary kiln furnace 30 and It is to be put into the calcination furnace 100 combined with the side of the fluidized bed furnace 40 .

In order to perform the first firing step (S30), the rotary kiln furnace 30 is inclined and the inside of the cell (monthly) is circular refractory bricks are masonry, and the refractory has strength and wear resistance that protrudes in a spiral screw type. The lifting blades 39 made of bricks are assembled so that the objects to be incinerated and the objects to be burned are rotated, stirred and reversed toward the fluidized bed furnace so that the objects to be incinerated are combusted, and the object to be burned is 4.5mm or less, which also functions as a fluid medium. The recycled fine aggregate is heated and fired, and supplied to the fluidized bed furnace 40, which is the second and third firing steps (S40), and the first firing steps (S30) and 2 of the rotary kiln furnace 30 and the fluidized bed furnace 40 , providing a firing furnace 100 for performing a firing step (S100) capable of performing a third firing step (S40);

The inside of the cell (circular) is circular, and the refractory bricks are masonry, and the inlet side is intermittently strong and wear-resistant refractory bricks to protrude in a protruding manner, so that the lifting blades 39a are spirally formed. Through the structure in which the lifting blades 39a made of refractory bricks with strength and wear resistance that are masonry and protrude through the inlet in a spiral screw type are assembled so that the to-be-incinerated material and the to-be-fired material are rotated, stirred, and reversed toward the fluidized bed furnace. The to-be-incinerated material is burned, and the circulating fine aggregate of 4.5 mm or less, which is a material to be fired that also acts as a fluid medium, is heated and fired, and is supplied to the fluidized bed furnace 40, and the rotary kiln furnace 30 and the fluidized bed furnace 40 are mixed. A calcination furnace 100 having a single structure is provided;

The rotary kiln furnace 30 is installed horizontally, there is no inclination, and the lifting blades 39a are made of high-strength and abrasion-resistant refractory bricks as a material and protrude at a high height so that they are arranged and advanced in a spiral, so that they are incinerated with the sintered material. to discharge the water to the fluidized bed furnace 40 after moving toward the outlet while rotating, stirring, and inverting;

It is supplied to the fluidized bed furnace 40 after combustion through the inclined structure, and to provide the kiln 100 having a structure in which the rotary kiln furnace 30 and the fluidized bed furnace 40 are mixed.

Before inputting the recycled fine aggregate of 4.5mm or less produced by dry or wet method [Applicant's earlier application No. 10-2020-0052499, title of invention: Dry sorting type improvement strike mill and dry recycled aggregate manufacturing method using the same], rotary In the gas supply step (S31), the low-nox LP gas burner (31) maintains the inside of the rotary kiln furnace (30) at 700-800° C. or less to an operating temperature exceeding the ignition temperature of the waste to be burned. After dry gasification, combustible mixed waste, industrial waste, combustible household waste, and non-combustible waste partially mixed in the collection process and without classification and sorting process (self-selection of scrap iron and non-ferrous material are manually selected) to improve combustion efficiency For this purpose, the recycled fuel crushed to a size of 20 mm or less is started to be put into the rotary kiln furnace 30, and the internal temperature of the rotary kiln 30 is not to exceed 800° C. Recycled fine aggregates of mm or less and combustible waste recycled fuel crushed to a size of 20 mm or less are completely burned in the fluidized bed furnace 40 for the second and third times at 800° C. It was configured to serve as the SNCR (47) function for treating nitrogen oxides by spraying and spraying urea water.

Since the upper part of the fluidized bed tank 40 is a high temperature layer of 900 ° C. or higher, a waste heat boiler 48 is installed, and using steam heat and heat medium oil heat, it is used as a dryer heat source, a vacuum dryer heat source, and a smart farm heat source. It will also be possible, and the circulating fine aggregate of 4.5 mm or less serving as a fluid medium is composed of a calcination furnace 100 in which a rotary kiln furnace 30 is combined on the side of a fluidized bed furnace 40;

After being heated and fired in the first rotary kiln furnace 30, the second fluidized bed furnace 40 is dropped and piled up in a conical diffuser plate 43 having a fluidized bed region 42 installed to disperse air in the center of the fluidized bed furnace 40. ) At the bottom of the lower layer, heated pressure air having a static pressure of 1,500 to 3,500 mmAq is heated to 700-800° C. or less in the primary rotary kiln furnace 30 by a fluidized air nozzle through the fluidized air pipe of the multi-stage centrifugal blower (45). The calcined sand particles generate a flow effect as if water boils in the center of the fluidized bed furnace 40, and the original fluidized bed furnace 40 prevents the fluidized medium from going out of the fluidized bed furnace 40, but the primary rotary In the kiln furnace (30), recycled fine aggregates of 4.5 mm or less and combustible waste recycled as fuel are continuously input together, the combustible waste is burned and incinerated to become a heat source for firing, and recycled fine aggregates of 4.5 mm or less are not fired. 4.5mm heated and fired into the space between the inner wall of the fluidized bed furnace 40 and the conical diffuser plate 43 while being accumulated on the diffuser plate 43 and flowing by the pressure and speed of the heated pressure air ejected from the fluidized air nozzle. The following recycled fine aggregates are continuously discharged and discharged through the hopper 44 at the lower side of the fluidized bed furnace 40 .

The calcined recycled fine aggregate of 4.5 mm or less is transferred by the heat-resistant heat-resistant transfer conveyor 50 that is the discharge step (S50) through the hopper 44 and put into the water spray box 51 inlet of the watering step (S51). While spraying the coolant supplied from the tank, inject it into the aggregate scrap 53 of the scrip step (S52) (the heated circulating fine aggregate of 4.5 mm or less is rapidly cooled by water, and the difference between the incineration ash, cement and sand particles Cracks occur) If it falls into the cooling tank 70 in the cooling step (S70) by rubbing it together with the circulating fine aggregate, ash and water, and the sand pump attached to the outside of the cooling tank 70 is pumped and transported to the supply storage step (S72) ), after being supplied to the supply tank 72 in the sorting step (S73), the inflow and sorting along with the sewage into the trommel sorter 73, and 1.5 mm or less together with the sewage in the cyclone classifying step (S76) in the micro-solution integrated hydro It flows into the lower storage tank of the sand unit to which the multi-cyclone 76 is attached, and pumps it with a sand pump connected to the storage tank with a suction pipe. It flows into the line mix at the top of the settling tank through the integrated hydro multi-cyclone overflow manifold, and the sand for mortar less than 1.5 mm in the under-flower under the integrated hydro multi-cyclone falls into the protection box above the dewatering screen with sewage water. In the upper part of the vibrating dewatering screen 78 of the dewatering screen step (S78), sewage water and sand for mortar of 1.5 mm or less are dewatered and stored or shipped as products.

In the trommel sorter 73, 1.5 mm or more is input to the vertical standing mill 74 of the fine crushing step (S74) by the standing mill, re-crushed to 1.5 mm or less, and flows into the trommel sorter 73 and continues to circulate. It is re-grinded and selected.

The fine powder of 0.08 mm or less in the integral hydro multi-cyclone 76 lower overflower passes through the overflow manifold and flows into the line mix 115, which is the mixing step (S115) of the settling tank 116 upper part of the precipitation step (S116), In addition, the venturi scrip lower sedimentation sewage (ash sedimentation) for cleaning the exhaust gas is also pumped into the line mix 115, and chemical water is pumped from the tank in which water and organic polymer are dissolved and stored in the line mix 115 to pump the line mix. As it passes through (115), the sewage water and chemical water (polymer coagulant) are mixed well, and they flow into the center of the settling tank 115, which is the precipitation step (S115), and are gravity-separated, and fine particles form flocs and become heavy and settling as they are separated from water. Water is stored and recycled in a water tank through weir, and the insufficient water is supplemented with fresh water.

The settling tank 115 of the mixing step (S115) and the water tank 114 of the watering step (S114) are connected to the chemical tank 113 and the multi-hydro cyclone 76 of the chemical supply step (S113), and then gravity separate sedimentation. The settled slurry is accumulated under the settling tank 115, and a scraper connected to the center of the settling tank 115 with a speed reducer and a shaft driven scraper is rotated to scrape the settled slurry from the bottom of the settling tank 115 to the center, and this scraper is a settling tank The scraper rises and falls according to the load according to the increase or decrease of the amount of sludge inside, and the slurry collected in the center is pumped by a discharge pipe connected from the center of the settling tank 115 to the outer wall and a slurry pump connected to the discharge pipe on the outer wall. and sent to the thickening tank 120, which is the concentration step (S120), and the central part of the thickening tank 120 rotates at a low speed while the impeller connected to the reducer and shaft rotates at a low speed so that the slurry is not precipitated and solidified.

A discharge pipe and a sludge pressurizing pump connected to the discharge pipe are installed on the outer wall of the tank of the thickener 120 to send and pressurize the filter press 130, and the chamber between the filter plates of the filter press 130 is filled with sludge, so that the moisture content is less than 30% Until dehydration occurs, the pressurized pump continues to operate, and while the pressurized pump is in operation, the dewatering step (S130) is performed in the filter press 130, and the dehydrated water is recovered, stored in a water storage tank, and reused. The sludge is caked and separated and discharged.

The dehydrated water is recovered and recycled back to the water tank through the settling tank 113, and the caked sludge with a moisture content of less than 30% is dried in a dryer system that recovers waste heat and operates (it has been calcined in the previous process) as a raw material for cement. Recycled fine aggregates of 4.5 mm or less undergo plastic processing, re-grind to 1.5 mm or less, wash, sort, classify, and dehydrate water treatment processes to crush the waste concrete into clean, mortar sand products with good particle size and strength. It is to manufacture sand for recovery and recycling of cement and mortar of 1.5 mm or less by calcining recycled fine aggregate while recycling fine recycled aggregate of 4.5 mm or less as a fluid medium.

As the first example of a configurable process for discharging exhaust gas suitable for environmental regulations (refer to FIGS. 1, 2 and 7), the recycled aggregate 4.5 m or less from the recycled aggregate tank 10 in the recycled aggregate supply step (S10) In the mixed waste supply step (S11), combustible waste crushed to 20 mm or less from the mixed waste raw material tank 11 is supplied, and in the recycled aggregate and mixed waste supply step (S20), it is supplied to the tool bank 20 After being mixed, it is supplied to the rotary kiln furnace 30 and used and incinerated at 700 to 800° C. as a primary fuel in the first firing step (S30).

The fuel primary incinerated in the rotary kiln furnace 30 is secondarily burned in the fluidized bed of the secondary fluidized bed furnace 40, which is the secondary firing step (S40), and thirdly burned in the upper freeboard bed, the fluidized bed furnace In (40), the interior that rises to 800°C or more by the air that spreads evenly and reaches a high temperature causes secondary and tertiary complete combustion to oxidize incomplete combustion and refractory materials, and spray and spray urea water in the fluidized bed The SNCR (47) function for treating nitrogen oxides is also performed, and the gas outlet in the fluidized bed is a high temperature layer of 900°C or higher. If it is used as a heat source, vacuum dryer heat source, and smart farm heat source and can be operated continuously, power generation is possible, and the exhaust gas, which has dropped in temperature, is heated through the heat exchanger 80, which is the waste heat supply step (S80). The exhaust gas, which is sent to the air for the multi-stage centrifugal blower 45 and the low-nox LP gas burner 41 of (40), and whose temperature has dropped to around 150° C., passes through the dust collector 81 in the dust collection step (S81) to collect ash and fine dust. From the white smoke prevention step (S90) to the white smoke prevention heat exchanger 95 and the chimney 98 in the discharge step (S98) through the venturi screen 90 in the gas dust collection step (S89) in which the recovery and fine particles and acid gas are removed to be released.

In the second process flow, as shown in FIGS. 2, 3 and 8, in the recycled aggregate supply step (S10), the recycled aggregate of 4.5 m or less is supplied from the recycled aggregate tank 10, and the mixed waste supply step In (S11), the combustible waste crushed to a size of 20 mm or less is supplied from the mixed waste raw materialization tank 11, and the recycled aggregate and the mixed waste are supplied to the supply tank 20 in the supply step (S20) and then mixed and mixed in a rotary kiln furnace It is supplied to (30) and used as a primary fuel in the first firing step (S30) and incinerated at 700 to 800°C.

The fuel primary incinerated in the rotary kiln furnace 30 is secondarily burned in the fluidized bed of the secondary fluidized bed furnace 40, which is the secondary firing step (S40), and thirdly burned in the upper freeboard bed, the fluidized bed furnace In (40), the interior that rises to 800°C or more by the air that spreads evenly and reaches a high temperature causes secondary and tertiary complete combustion to oxidize incomplete combustion and refractory materials, and spray and spray urea water in the fluidized bed The high-temperature centrifugal separation step (S110) to prevent scaling of the waste heat boiler 111 in the upper layer inside the fluidized bed because the gas outlet side in the fluidized bed is a high-temperature layer that is 900°C or higher. ), a castable construction is installed inside so that the high-temperature centrifugal cyclone 110 can withstand high temperatures, and a waste heat boiler 111 is installed in the waste heat supply step (S111), which is the next step, to provide steam heat, dryer heat source, and vacuum dryer heat source. , if it is used as a heat source for a smart farm and can be operated continuously, power generation is possible, and the exhaust gas having a lower temperature is heated through the heat exchanger 112, which is the waste heat supply step (S112), in the multi-stage of the fluidized bed furnace 40 The exhaust gas, which is sent to the centrifugal blower 45 and the air for the low-nox LP gas burner 41, and whose temperature has dropped to around 150° C., passes through the dust collector 81 in the dust collection step (S81) to recover ash and fine dust, and It is to be discharged from the white smoke prevention step (S90) to the white smoke heat exchanger 95 and the chimney 98 in the discharge step (S98) through the venturi script 90 in the gas dust collection step (S89) from which the acid gas is removed.

As a third example, as shown in FIGS. 5, 6, and 9, in the recycled aggregate supply step (S10), the recycled aggregate of 4.5 m or less is supplied from the recycled aggregate tank 10, and the mixed waste supply step (S11) ), the combustible waste crushed to a size of 20 mm or less is supplied from the mixed waste raw materialization tank 11, and the recycled aggregate and the mixed waste are supplied to the supply tank 20 in the supply step (S20) and then mixed and mixed in the rotary kiln furnace (30). ) and used as the primary fuel in the first firing step (S30) and incinerated at 700 to 800°C.

The fuel first incinerated in the rotary kiln furnace 30 is secondarily burned in the fluidized bed of the fluidized bed furnace 40, which is the second and third firing step (S40), and thirdly burned in the upper freeboard bed, the fluidized bed furnace In (40), the air rises to 800°C or more by the uniformly diffused air, and the inside heated to a high temperature undergoes incomplete combustion and secondary and tertiary complete combustion to oxidize refractory materials, and the gas outlet in the fluidized bed is at 900°C. In the next step, the high-temperature exhaust gas flows into the combustion chamber of the SNCR (47) which is the nitrogen oxide treatment step (S47) in the next step, and urea water is sprayed and sprayed to treat the nitrogen oxides, and a separate burner is attached to the SNCR (47). ) Do not let the internal temperature drop below 850℃.

In the lower part of the SNCR (47), the fallen ash and fine dust are accumulated, stored, recovered, and reused as an auxiliary material for cement.

The exhaust gas that has passed through the SNCR 47 passes through the waste heat boiler 48, which is the waste heat supply step (S48) at the upper part of the SNCR 47, and uses steam and heat medium oil heat to generate steam heat and dryer heat source, vacuum dryer heat source, and smart farm heat source. If it is used as a furnace and can be operated continuously, power generation is possible and the exhaust gas having a lower temperature passes through the heat exchanger 80, which is a heat exchange step (S80), and the heated air is heated by a multi-stage centrifugal blower (45) of the fluidized bed furnace (40). ) and the low-nox LP gas burner 41, and the exhaust gas whose temperature has dropped to around 150° C. goes through the dust collector 81 in the dust collection step (S81) to recover ash and fine dust, and remove fine particles and acid gas. It is to be discharged from the white smoke prevention step (S90) to the white smoke heat exchanger 95 and the chimney 98 in the discharge step (S98) through the venturi screen 90 in the gas dust collection step (S89).

In Examples 2 and 3, the process from the discharging step (S50) partially overlapping with the first process to the dehydration step (S130) will be omitted.

In coupling the primary rotary kiln furnace 30 to the side surface of the secondary fluidized bed furnace 40, the discharge portion of the rotary kiln furnace 30 connected to the side surface of the fluidized bed furnace 40 is inclined by 2 to 5 degrees lower. Refractory bricks inside the primary rotary kiln furnace 30 are intermittently formed into a spiral during masonry, and a protrusion protruding in the form of a spiral screw is formed so as to induce the discharge of the burned material and the burned material toward the outlet and flow while rotating. Recycled fine aggregates of 4.5 mm or less as the medium and combustible waste crushed to 20 mm or less are put together and stirred and inverted to move toward the fluidized bed furnace 40 while heating, burning, and incineration, and the rotary kiln furnace 30 The combustion efficiency and the firing effect are increased through the calcination furnace 100 configured to be combined on the side surface of the fluidized bed furnace 40 .

In coupling the primary rotary kiln furnace 30 to the side of the secondary fluidized bed furnace 40,

The rotary kiln furnace 30 connected to the side of the fluidized bed furnace 40 is horizontally parallel to induce the discharging of the burned material and the burned material inside the primary rotary kiln furnace 30 toward the outlet;

When the internal fire bricks of the primary rotary kiln furnace (30) are masonry, the entrance side constitutes a refractory brick protrusion that protrudes in a spiral spiral, and a protrusion that protrudes in a screw-screw type past the entrance makes the rotary kiln furnace (30) rotate. The rotary kiln furnace 30 is moved to the fluidized bed furnace at the same time as heating, combustion, and incineration while stirring and reversing, while circulating fine aggregates of 4.5 mm or less and combustible waste crushed to 20 mm or less are put together as a fluidized medium. 40) to form the firing furnace 100 in combination with the side surface to increase the combustion efficiency and the firing effect.

In general, the incineration fluidized bed furnace 40 should not lose the fluidized medium. However, while recycling fine recycled aggregates of 4.5 mm or less from crushed waste concrete as fluid media, at the same time calcining recycled fine aggregates of 4.5 mm or less, and the calcined cement is recovered. In the process of recycling, separating, crushing, washing, classifying, and manufacturing and commercializing sand for mortar less than 1.5 mm in size, dehydrated,

Combustible waste crushed to a size of less than 20 mm from the recycled fine aggregate tank 10 and less than 4.5 mm from the recycled fine aggregate tank 11 from the waste fuel conversion tank 11 through the supply tank 20 into the primary rotary killer furnace 30, 700 Recycled fine aggregates of 4.5 mm or less at ~800 ° C are heated and fired, and combustible waste crushed to 20 mm or less is used as fuel in the primary rotary killer furnace (30) Primary incineration and combustion, the secondary fluidized bed furnace (40) The circulating fine aggregates of 4.5 mm or less continuously injected, heated and fired are accumulated in the central part of the diffuser plate 43 at the lower part of the fluidized bed furnace 40, so that the This is to continuously discharge into the space between the lower inner wall of the fluidized bed furnace 40 and the conical diffuser plate 43 .

Combustible waste crushed to a size of 25 mm or less in the primary rotary kiln furnace 30 is primary incinerated as a heat source, secondary combustion in the fluidized bed of the secondary fluidized bed furnace 40, and tertiary combustion in the upper freeboard layer, A waste heat boiler 48 is installed in the upper layer inside the fluidized bed, or a waste heat boiler 48 is installed in the next step after passing through the SNCR 47, or a waste heat boiler ( 111), to operate a hot water steam boiler or heat medium boiler, and use it as a heat source for a dryer or vacuum dryer that processes other types of waste, or as a heat source for electric power or a heat source for a smart farm.

The fine powder of 0.08 or less from the integrated hydro multi-cyclone (76) lower overflower flows into the line mix at the top of the settling tank 116 through the overflow manifold, and also the venturi scree lower sedimentation sewage (ash sedimentation) that cleans the exhaust gas. Also pumped and introduced into the line mix 115, pumping the chemical water from the chemical tank 113, which is a tank in which water and organic polymer are dissolved and stored in the line mix 115, and passing through the line mix 115, sewage and chemicals Water (polymer coagulant) is mixed well and flows into the center of the sedimentation tank 116. As gravity is separated, fine particles form flocs and become heavy and settling, separated from water, and the water is stored and recycled in the water tank 114 through the weir. At this time, the insufficient water is supplemented with fresh water.

The gravity-separated sedimented slurry is piled up under the sedimentation tank 116, and the scraper connected to the axis and connected to the shaft in the center of the sedimentation tank 116 rakes the sedimented slurry from the bottom of the sedimentation tank 116 to the center. The crepa rises and falls according to the load according to the increase or decrease of the amount of sludge inside the settling tank 116, and the slurry collected in the center is connected to the discharge pipe from the center of the settling tank 116 to the outer wall and the discharge pipe to the outer wall The mounted slurry pump pumps it and sends it to the thickening tank 120, and the central part of the thickening tank 120 rotates at a low speed with the impeller connected to the reducer and the shaft so that the slurry is not precipitated and solidified.

A discharge pipe and a sludge pressurizing pump connected to the discharge pipe are installed on the outer wall of the tank of the thickener 120 to send and pressurize the filter press 130, and the chamber between the filter plates of the filter press 130 is filled with sludge, so that the moisture content is less than 30% The pressurized pump is continuously operated and maintained until dehydration is performed until is discharged

The dehydrated water is recovered and recycled back to the water tank 111 through the settling tank 113, and the caked sludge having a moisture content of less than 30% is dried in a dryer system that recovers waste heat and operates to recover and recycle cement.

10: circulating fine aggregate tank 11: waste fuel conversion tank
20, 72: supply tank 30: rotary kiln furnace
31: low-nox LP gas burner 40: fluidized bed furnace
41: low-nox burner 43: conical acid substrate
44: hopper 47: SNCR
48, 48a, 111: waste heat boiler 50: heat-resistant transfer conveyor
51: watering box 53: aggregate script
70: cooling tank 73: trommel sorter
74: vertical mill 76: multi-hydro cyclone
78: dewatering screen 80: heat exchanger
81: dust collector 90: venturi script
95: white smoke heat exchanger 98: chimney
100: calcination furnace 113: chemical tank
114: water tank 115: line mix
116: settling tank 120: thickening tank
130: filter press

Claims (12)

A recycled fine aggregate supply step (S10) in which the recycled fine aggregate of 4.5 mm or less is stored and supplied;
A mixed waste supply step (S11) of storing and supplying combustible waste crushed to a size of 20 mm or less;
A recycled aggregate and mixed waste supply step (S20) of receiving and mixing the recycled fine aggregate and the combustible waste;
A primary firing step (S30) of recycling fine circulating aggregates of 4.5 mm or less from the supply tank 20 as a fluid medium and heating and firing combustible waste crushed to 20 mm or less into recycled fuel as auxiliary fuel;
The rotary kiln furnace 30 of the first firing step (S30) is connected, and the diffuser plate 43 is installed at the lower side, and heating pressure air is supplied from the multi-stage centrifugal blower 45, so that the combustible waste is burned and incinerated. A secondary firing step (S40) in which the recycled fine aggregate of mm or less is fired by secondary and tertiary combustion;
a firing step (S100) of combining and firing the first firing step (S30) and the second firing step (S40);
a waste heat supply step (S48) of installing a waste heat boiler (48) above the fluidized bed furnace (40) of the secondary firing step (S40);
a heat exchange step (S80) of installing a heat exchanger 80 to supply steam heat and heat medium oil heat;
A rotary kiln furnace, characterized in that it comprises a dust collection step (S81) of recovering ash and fine dust, a gas dust collection step (S89) of removing fine particles and acid gas, a white smoke prevention step (S90) and a discharge step (S98) A method for producing sand for mortar using a calcination furnace combined with a fluidized bed furnace.
A recycled fine aggregate supply step (S10) in which the recycled fine aggregate of 4.5 mm or less is stored and supplied;
A mixed waste supply step (S11) of storing and supplying combustible waste crushed to a size of 20 mm or less;
A recycled aggregate and mixed waste supply step (S20) of receiving and mixing the recycled fine aggregate and the combustible waste;
From the supply tank 20, circulating fine aggregates of 4.5 mm or less act as a fluid medium, and the circulating fine aggregates of 4.5 mm or less are calcined to be recycled as sand for mortar, and combustible waste crushed to 20 mm or less is recycled as a fuel for recycling. a first firing step of heating and firing (S30);
The rotary kiln furnace 30 of the first firing step (S30) is connected, and the diffuser plate 43 is installed at the lower side, and heating pressure air is supplied from the multi-stage centrifugal blower 45, so that the combustible waste is burned and incinerated. A secondary firing step (S40) in which the recycled fine aggregate of mm or less is fired by secondary and tertiary combustion;
a firing step (S100) of combining and firing the first firing step (S30) and the second firing step (S40);
By spraying and spraying urea water in the fluidized bed, it also serves as the SNCR (47) function to treat nitrogen oxides, to prevent the formation of scaling of the waste heat boiler 111 in the upper layer inside the fluidized bed, and to make the high-temperature centrifugal cyclone 110 withstand high temperatures. A high-temperature centrifugal separation step (S110) and;
a waste heat supply step (S111) of installing the waste heat boiler 111 and utilizing it as steam heat, a heat source for a dryer, a heat source for a vacuum dryer, and a heat source for a smart farm;
a heat exchange step (S112) of installing a heat exchanger 112 to supply steam heat and heat medium oil heat;
A rotary kiln furnace, characterized in that it comprises a dust collection step (S81) of recovering ash and fine dust, a gas dust collection step (S89) of removing fine particles and acid gas, a white smoke prevention step (S90) and a discharge step (S98) A method for producing sand for mortar using a calcination furnace combined with a fluidized bed furnace.
A recycled fine aggregate supply step (S10) in which the recycled fine aggregate of 4.5 mm or less is stored and supplied;
A mixed waste supply step (S11) of storing and supplying combustible waste crushed to a size of 20 mm or less;
A recycled aggregate and mixed waste supply step (S20) of receiving and mixing the recycled fine aggregate and the combustible waste;
A primary firing step (S30) of recycling fine circulating aggregates of 4.5 mm or less from the supply tank 20 as a fluid medium and heating and firing combustible waste crushed to 20 mm or less into recycled fuel as auxiliary fuel;
The rotary kiln furnace 30 of the first firing step (S30) is connected, and the diffuser plate 43 is installed at the lower side, and heating pressure air is supplied from the multi-stage centrifugal blower 45, so that the combustible waste is burned and incinerated. A secondary firing step (S40) in which the recycled fine aggregate of mm or less is fired by secondary and tertiary combustion;
a firing step (S100) of combining and firing the first firing step (S30) and the second firing step (S40);
The high-temperature exhaust gas flows into the SNCR (47) combustion chamber, urea water is sprayed and sprayed to treat nitrogen oxide, and a separate burner is attached to prevent the internal temperature of the SNCR (47) from falling below 850 ° C. S47) and;
A waste heat supply step (S48) in which the exhaust gas having passed through the SNCR (47) passes through the upper waste heat boiler (48) in the SNCR (47);
a heat exchange step (S80) of installing a heat exchanger 80 to supply steam heat and heat medium oil heat;
A rotary kiln furnace, characterized in that it comprises a dust collection step (S81) of recovering ash and fine dust, a gas dust collection step (S89) of removing fine particles and acid gas, a white smoke prevention step (S90) and a discharge step (S98) A method for producing sand for mortar using a calcination furnace combined with a fluidized bed furnace.
The method of claim 1,
In the first firing step (S30), the low-nox LP gas burner 31 maintains the rotary kiln furnace 30 at 700 to 800° C. to dry and gasify the waste to an operating temperature exceeding the ignition temperature of the waste to be combusted, followed by combustibility. A method for producing sand for mortar using a kiln combining a rotary kiln furnace and a fluidized bed furnace, characterized in that the recycled fuel crushed to a size of 20 mm or less is input and burned in order to improve combustion efficiency without the mixed waste and property classification and sorting process.
The method of claim 1,
In the secondary firing step 40, the recycled aggregate of 4.5 mm or less, which is a raw material of the product and serves as a fluid medium, and the combustible waste recycled fuel crushed to a standard of 20 mm or less are uniformly reached at 800 ° C. A method for producing sand for mortar using a calcination furnace combining a rotary kiln furnace and a fluidized bed furnace, characterized in that it is configured to serve as an SNCR (47) that treats nitrogen oxides by spraying and spraying urea water in the fluidized bed with secondary and tertiary complete combustion .
The method of claim 1,
In the secondary firing step (S40), a waste heat boiler is installed in a high temperature layer with an upper portion of 900° C. or higher in the fluidized bed, and steam heat and heat medium oil heat are used as a dryer heat source, a vacuum dryer heat source, and a smart farm heat source, characterized in that A method for producing sand for mortar using a calcination furnace that combines a rotary kiln furnace and a fluidized bed furnace.
The method of claim 1,
In the secondary firing step (S40), the diffuser plate 43 is installed, blowing is made by the multi-step centrifugal blower 45, and after primary heating and firing in the rotary kiln furnace 30 in the upper fluidized bed area, it is dropped and piled up. From the lower side, heated pressure air having a stop pressure of 1,500 to 3,500 mmAq is supplied to the fluidized air nozzle from the multi-stage centrifugal blower 45, and the sand particles that are first heated and fired are as water boils in the center of the fluidized bed on the upper side of the diffuser plate 43. A calcination furnace combining a rotary kiln furnace and a fluidized bed furnace, characterized in that the flow effect is generated, and the recycled fine aggregate of 4.5 mm or less acts as a fluid medium, and the recycled fine aggregate of 4.5 mm or less is fired and discharged to the outside, which is produced as sand for mortar. A method for producing sand for mortar using
The method of claim 1,
In the secondary firing step (S40), the fired fine recycled aggregate of 4.5 mm or less is transported by the heat-resistant heat-resistant transport conveyor 50 through the hopper 44 and put into the inlet of the water spray box 51 above the aggregate scrip. When the cooling water supplied from the water tank 52 is sprayed, it is put into the aggregate scrap 53 and processed as if rubbed together with the circulating fine aggregate, ash and water so that it falls into the cooling tank 70, and the supply tank 72 and A method for producing sand for mortar using a calcination furnace in which a rotary kiln furnace and a fluidized bed furnace are combined, characterized in that supplied to the trommel separator (73).
The method of claim 1,
In the secondary firing step (S40), the second combustion in the fluidized bed of the fluidized bed furnace 40, the third combustion in the upper freeboard layer, and the air evenly spreading in the fluidized bed furnace 40 to reach 800° C. or higher The inside, which rises to a high temperature and rises to a high temperature, performs secondary and tertiary complete combustion to oxidize incomplete combustion and refractory materials, and serves as a SNCR (47) function to treat nitrogen oxides by spraying and spraying urea water in the fluidized bed. , since the gas outlet side in the fluidized bed is a high temperature layer of 900℃ or higher, by installing a waste heat boiler 48 in the upper layer inside the fluidized bed, steam heat and heat medium oil heat are used as a dryer heat source, a vacuum dryer heat source, and a smart farm heat source. If this is possible, power generation is possible, and the exhaust gas, which has dropped in temperature, passes through the heat exchanger 80, which is the waste heat supply step (S80). The exhaust gas sent to the air for the burner 41 and the temperature of which has dropped to around 150° C. passes through the dust collector 81 in the dust collection step (S81) to recover ash and fine dust, and to remove fine particles and acid gas gas dust collection step (S89) ), through the venturi screen 90, to discharge the flue-preventing heat exchanger 95 from the white smoke prevention step (S90) and the chimney 98 in the discharging step (S98). A method for producing sand for mortar using
3. The method of claim 2,
In the secondary firing step (S40), the second combustion in the fluidized bed of the fluidized bed furnace 40, the third combustion in the upper freeboard layer, and the air evenly spreading in the fluidized bed furnace 40 to reach 800° C. or higher The inside, which rises to a high temperature and rises to a high temperature, performs secondary and tertiary complete combustion to oxidize incomplete combustion and refractory materials, and serves as a SNCR (47) function to treat nitrogen oxides by spraying and spraying urea water in the fluidized bed. , since the gas outlet side in the fluidized bed is a high temperature layer of 900 ° C or higher, it is intended to prevent the formation of scaling of the waste heat boiler 111 in the upper layer inside the fluidized bed so that the high temperature centrifugal cyclone 110, which is the high temperature centrifugation step (S110), withstands the high temperature and In the next step, waste heat supply step (S111), the waste heat boiler 111 is installed and used as steam heat, dryer heat source, vacuum dryer heat source, and smart farm heat source. The air heated while passing through the heat exchanger 112, which is the waste heat supply step (S112), is sent to the air for the multi-stage centrifugal blower 45 and the low-nox LP gas burner 41 of the fluidized bed furnace 40, and the temperature is 150 ° C. The exhaust gas that has fallen back and forth passes through the dust collector 81 in the dust collection step (S81) to recover ash and fine dust, and passes through the venturi screen 90 in the gas dust collection step (S89) where fine particles and acid gas are removed to prevent white smoke ( A method for producing sand for mortar using a calcination furnace in which a rotary kiln furnace and a fluidized bed furnace are combined, characterized in that they are discharged from the white smoke heat exchanger (95) and the chimney (98) in the discharge step (S98) from S90).
4. The method of claim 3,
In the secondary firing step (S40), the secondary combustion in the fluidized bed of the secondary fluidized bed furnace 40, the tertiary combustion in the upper freeboard bed, and the air that evenly spreads in the fluidized bed furnace 40 The inside, which rises above ℃ and high temperature, undergoes secondary and tertiary complete combustion to oxidize incomplete combustion and refractory materials. After entering the combustion chamber of the SNCR 47, which is a step (S47), urea water is sprayed and sprayed to treat nitrogen oxide, and a separate burner is attached to prevent the internal temperature of the SNCR 47 from falling below 850 ° C.
The exhaust gas that has passed through the SNCR 47 passes through the waste heat boiler 48, which is the waste heat supply step (S48) at the upper part of the SNCR 47, and uses steam and heat medium oil heat to generate steam heat and dryer heat source, vacuum dryer heat source, and smart farm heat source. If it is used as a furnace and can be operated continuously, power generation is possible and the exhaust gas having a lower temperature passes through the heat exchanger 80, which is a heat exchange step (S80), and the heated air is heated by a multi-stage centrifugal blower (45) of the fluidized bed furnace (40). ) and the low-nox LP gas burner 41, and the exhaust gas whose temperature has dropped to around 150° C. goes through the dust collector 81 in the dust collection step (S81) to recover ash and fine dust, and remove fine particles and acid gas. Rotary kiln, characterized in that it is discharged from the white smoke prevention step (S90) to the white smoke prevention heat exchanger 95 and the chimney 98 in the discharge step (S98) through the venturi screen 90 in the gas dust collection step (S90) A method for producing sand for mortar using a calcination furnace in which a furnace and a fluidized bed furnace are combined.
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