KR20230128708A - Continuous waste treatment system and method thereof - Google Patents

Abstract

The present invention is a waste pump for continuously supplying waste; a drying device that sprays the waste into contact with a heat source to dry the waste into particles; a pyrolysis device for thermally decomposing the particulate waste into pyrolysis sludge and pyrolysis gas; It relates to a continuous waste disposal system including a combustion device that burns the pyrolysis gas and a cooling device that rapidly cools the burned pyrolysis gas.

Description

Continuous waste treatment system and its process {CONTINUOUS WASTE TREATMENT SYSTEM AND METHOD THEREOF}

The present invention relates to a continuous waste disposal system and its process. Specifically, the present invention relates to a continuous waste treatment system and process capable of minimizing the amount of harmful compounds discharged during treatment by heat-treating and burning waste under specific conditions.

In general, various domestic wastes generated at home and industrial wastes generated at industrial sites are partially recycled through separate collection, etc. is being processed in a way that

In a conventional wastewater treatment process, wastewater is sludged through an aeration tank and a sludge settling unit, and then the sludge containing harmful substances is landfilled or incinerated.

However, industrial waste and wastewater generate harmful chlorine compounds such as dioxins as unwanted by-products in various product production processes such as chemical processes, pulp processes, and incineration processes. Dioxin contained in waste and sludge is released into soil, water and air.

In addition, the high-temperature exhaust gas generated in the process of incinerating the waste is gradually cooled in the air, causing a problem in that a small amount of decomposed dioxin is regenerated.

Korean Patent Publication No. 10-2011-0129845 Korean Patent Publication No. 10-2014-0039647

The present invention is to solve the problems of the prior art, and can completely decompose harmful compounds such as dioxin, suppress the resynthesis of harmful compounds, and does not require complicated equipment, so that it can be easily applied to existing processes. To provide a food waste treatment system and its process.

One embodiment of the present invention is a waste pump for continuously supplying waste; a drying device that sprays the waste into contact with a heat source to dry the waste into particles; a pyrolysis device for thermally decomposing the particulate waste into pyrolysis sludge and pyrolysis gas; It provides a continuous waste disposal system including a combustion device for burning the pyrolysis gas and a cooling device for rapidly cooling the burned pyrolysis gas.

In one embodiment of the present invention, there is provided a continuous waste treatment system further comprising a gas heating unit for heating and supplying gas to the drying device.

In one embodiment of the present invention, the gas provides a continuous waste treatment system that includes an inert gas.

In one embodiment of the present invention, there is provided a continuous waste disposal system further comprising a feeder for continuously supplying the particulate waste discharged from the drying device to the pyrolysis device.

In one embodiment of the present invention, the feeder is a measuring unit for measuring the size of the particle-shaped waste and a particle sorting unit for selecting the waste whose size is less than or equal to a pre-stored reference value and the waste exceeding the reference value It provides a continuous waste disposal system that includes.

In one embodiment of the present invention, there is provided a continuous waste disposal system further comprising a crushing unit for crushing the waste exceeding the reference value.

In one embodiment of the present invention, there is provided a continuous waste disposal system further comprising a transfer pipe for continuously transferring the pyrolysis gas from the pyrolysis device to the combustion device.

In one embodiment of the present invention, the transfer pipe provides a continuous waste disposal system in which the pyrolysis gas is mixed with a carrier gas and the pyrolysis gas is moved to the combustion device.

Another embodiment of the present invention is spray-drying sludge-type waste to produce a particle form; Pyrolyzing the particles into pyrolysis sludge and pyrolysis gas in an oxygen-free atmosphere; It provides a continuous waste treatment process comprising the step of burning the pyrolysis gas generated in the pyrolysis step with air and the step of rapidly cooling the pyrolysis gas burned in the combustion step.

In another embodiment of the present invention, the particles are primary particles, and the average particle diameter of the primary particles is greater than 0 mm and less than or equal to 3 mm.

In another embodiment of the present invention, the step of preparing the particle form provides a continuous waste treatment process in which the waste in the form of sludge is dried at a temperature of 150 ° C. to 250 ° C. to be prepared in the form of particles.

In another embodiment of the present invention, there is provided a continuous waste treatment process further comprising the step of classifying the waste in the form of particles and selecting only the particles having an average particle diameter greater than 0 mm and less than or equal to 3 mm.

In another embodiment of the present invention, a continuous waste treatment process further comprising the step of pulverizing the particles having an average particle diameter of more than 3 mm is provided.

According to the continuous waste treatment system and process according to the embodiments of the present invention, the waste particle size supplied to the pyrolysis device is uniformly controlled so that harmful compounds such as dioxin in the waste can be completely decomposed, and the waste is properly disposed of. The efficiency of the overall waste treatment process can be improved by maximizing the efficiency of pyrolysis and combustion through pretreatment.

1 is a schematic diagram showing a continuous waste treatment system according to an exemplary embodiment of the present invention.
2 is a cross-sectional view showing a drying apparatus according to an exemplary embodiment of the present invention.
Figure 3 is a schematic diagram showing a continuous waste treatment system according to another embodiment of the present invention.

The detailed description of the present invention is intended to completely explain the present invention to those skilled in the art. Throughout the specification, when a part is said to “include” a certain component or to “characterize” a certain structure or shape, this excludes other components or excludes other structures and shapes unless otherwise stated. It does not mean that it does, but it can include other components, structures and shapes.

Since the present invention can apply various transformations and have various embodiments, specific embodiments will be presented and described in detail in the detailed description. However, this is not intended to limit the content of the invention by the examples, and should be understood to include all conversions, equivalents, or substitutes included in the spirit and technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings. However, the drawings are for illustrating the present invention, and the scope of the present invention is not limited by the drawings.

1 is a schematic diagram showing a continuous waste disposal system 100 according to an exemplary embodiment of the present invention.

The continuous waste treatment system 100 may include a waste pump 10 , a drying device 20 , a pyrolysis device 30 , a combustion device 40 and a cooling device 50 .

The waste pump 10 continuously moves the waste to the drying device 20, and may be located between a wastewater treatment plant or a waste storage unit in which the waste is stored and the drying device 20. That is, the waste pump 10 is located in the passage for supplying waste to the drying device 20, and can adjust the presence or absence of the waste in the passage, the movement speed, and the movement amount.

The waste pump 10 may be divided into a pump using centrifugal force, a pump using buoyancy of air, and a pump using rotation of a helical shaft.

Pumps in the form of rotary blades using centrifugal force include non-closed centrifugal pumps, bladeless centrifugal pumps, and suction screw centrifugal pumps, air lift pumps using air buoyancy, and single-screw pumps with a spiral rotation shaft ( mono pump) may be included.

In one embodiment, when the waste pump 10 is a single-screw pump, impeller blades are spirally provided on the outside of the rotating shaft, and waste is introduced between the impeller blades and rotated so that the impeller blades are folded and dried in the waste storage unit. The waste can be pushed in the direction of (20) and supplied.

The waste pump 10 may control the speed and amount of waste supplied to the drying device 20 by adjusting the rotational speed.

The drying device 20 is to dry the waste into particles (or waste particles) by spraying the waste and bringing it into contact with a heat source.

The drying device 20 may include a drying chamber 21, a spray nozzle 22 coupled to one surface of the drying chamber 21 to spray waste, and a heat source supply unit 23 supplying a heat source.

In one embodiment, the inside of the drying chamber 21 is hollow, and a space in which waste sprayed by the spray nozzle 22 can be dried is provided. The drying chamber 21 may have different diameters of one surface to which the spray nozzle 22 is coupled and the other surface facing the one surface. A diameter of one surface of the drying chamber 21 may be larger than that of the other surface.

The drying chamber 21 includes a cylindrical body portion (not shown) having a constant diameter and an inclined portion (not shown) coupled to an end portion of the body portion and having an inner diameter that decreases toward the other surface facing one side coupled to the body portion. can include

The spray nozzle 22 is coupled to the upper surface of the drying chamber 21, and the spray nozzle 22 may include one or more spray holes through which waste is discharged. In addition, the spray nozzle 22 may be positioned so that the spray hole is drawn into the drying chamber 21 . The upper surface of the drying chamber 21 means a surface provided perpendicular to the central axis of the drying chamber 21 .

The waste supplied to the spray nozzle 22 may be supplied in the form of sludge, and may be sprayed into the drying chamber 21 through the spray nozzle 22 as fine liquid particles.

The spray nozzle 22 forms a spray angle at which the waste is dispersed, and at this time, the spray angle may be 10° to 150°. Preferably, it may be 15 ° to 135 °. The spraying angle may refer to a spreading angle of the waste when the waste is sprayed.

The heat source supply unit 23 is coupled to the side of the drying chamber 21, and supplies a heat source to the inside of the drying chamber 21 and to the waste liquid particles sprayed by the spray nozzle 22.

For example, the heat source may include hot air, and a gas heating unit 24 may be further included to supply hot air to the inside of the drying chamber 21 . The gas heating unit 24 may heat gas and supply the heated gas to the heat source supply unit 23 .

Also, any one of the heat source supply unit 23 and the gas heating unit 24 may supply a pressure to the heated gas to impart a directionality to the heated gas.

The continuous waste disposal system 100 may further include a gas supply unit 25 supplying gas to the gas heating unit 24 . The gas supply unit 25 stores gas and may include inert gas (or non-reactive gas). For example, the inert gas may include nitrogen, helium, argon, and the like.

Waste liquid particles sprayed through the spray nozzle 22 may have a uniform particle size (or diameter of the liquid particle), and waste particles in the form of dry solids in which moisture is vaporized in contact with a heat source may also have a uniform particle size. there is. Waste particles refer to primary particles, and particle diameter refers to the average particle diameter of primary particles.

The drying device 20 may adjust the average particle diameter of the primary waste particles by replacing the spray nozzle 22 with a different spray nozzle size.

The pyrolysis device 30 pyrolyzes waste in the form of particles, that is, waste particles into pyrolysis sludge and pyrolysis gas. The pyrolysis device 30 continuously pyrolyzes waste at a low temperature to produce pyrolysis sludge and pyrolysis gas. The pyrolysis sludge may include either a solid and a liquid or a mixture of a solid and a liquid.

The pyrolysis device 30 may include a rotary kiln, a fluidized bed reactor, and the like, but is not particularly limited as long as it is capable of continuously pyrolyzing waste.

The thermal decomposition device 30 is characterized in that the inside maintains any one of an oxygen-free and low-oxygen atmosphere. Here, the oxygen-free atmosphere may include a nitrogen atmosphere, an inert atmosphere, and a vacuum atmosphere. That is, the oxygen-free atmosphere means an atmosphere in which oxygen does not substantially exist among gases constituting the atmosphere, and specifically refers to an atmosphere in which the concentration of oxygen is 5 vol% or less, preferably 3 vol% or less, and no oxygen is present at all. , that is, an atmosphere in which the oxygen concentration is 0 vol%.

The pyrolysis device 30 decomposes the waste into pyrolysis sludge and pyrolysis gas, and harmful compounds included in the waste may be transferred to the combustion device 40 in the pyrolysis gas.

The pyrolysis device 30 can be classified into a direct heating calcination furnace and an indirect heating calcination furnace according to the heating method, and the direct heating calcination furnace is classified into a countercurrent rotary calcination furnace and a rectification rotary calcination furnace according to the direction in which sludge is supplied and the flow direction of heat and gas It can be.

In the pyrolysis device 30, the central axis may form an angle with the ground, and the location where the pyrolysis sludge is discharged (the rear end of the pyrolysis device 30) is the location where the waste is supplied to the pyrolysis device 30 (the pyrolysis device 30) The distance from the ground may be shorter than the shear of the That is, in the pyrolysis device 30, the location where the pyrolysis sludge is discharged may be provided with a lower height than the location where the waste is supplied.

Therefore, the waste particles supplied to the pyrolysis device 30 can be moved from the front end to the rear end of the pyrolysis device 30 by gravity, and since the waste particles supplied to the pyrolysis device 30 have a uniform particle diameter, waste The particles may be moved from the front end to the rear end of the pyrolysis device 30 at a uniform moving speed.

In the continuous waste treatment system 100 according to the present invention, as the moving speed of the waste particles is uniform, the waste particles have a uniform residence time in the pyrolysis device 30, and the thermal decomposition proceeds in the same manner.

The continuous waste treatment system 100 continuously moves waste particles from the drying device 20 to the pyrolysis device 30, and the waste discharged from the drying device 20 while the waste particles are pyrolyzed in the pyrolysis device 30. A feeder 31 for storing particles may be further included.

The feeder 31 is coupled to a main body (not shown) for storing waste particles and supplying the waste particles to the pyrolysis device 30 and one surface of the main body, and receiving waste particles discharged from the drying device 20 to the main body. A sending hopper (not shown) may be included.

The main body may supply waste particles to the pyrolysis device 30. At this time, the main body may include a supply control unit (not shown) for adjusting the supply speed and amount of waste particles supplied to the pyrolysis device 30.

In addition, the feeder 31 may further include a measuring unit (not shown), a particle sorting unit (not shown), and a crushing unit (not shown) to uniformize the waste particles supplied to the pyrolysis device 30 .

The measurement unit measures the particle size of the waste particles supplied to the hopper or main body.

The particle sorting unit compares the particle size of the waste particles measured by the measurement unit with a pre-stored reference value, and sorts and classifies waste particles having a particle diameter exceeding the reference value and waste particles having a particle diameter of less than the reference value.

The particle sorting unit may supply waste particles having a particle size smaller than a reference value to the pyrolysis device 30 .

The crushing unit receives waste particles having a particle size exceeding the standard value from the particle sorting unit and crushes the waste particles to a particle size equal to or less than the standard value.

The combustion device 40 receives the pyrolysis gas discharged from the pyrolysis device 30 and burns the pyrolysis gas. The combustion device 40 burns the pyrolysis gas and decomposes it into low molecular weight substances. That is, the combustion device 40 decomposes harmful chlorine compounds included in the pyrolysis gas into carbon dioxide (CO ₂ ) and water (H ₂ O), which are difficult to re-synthesize.

The combustion device 40 is characterized in that an air atmosphere is maintained inside to increase the combustion efficiency of the pyrolysis gas. That is, the combustion device 40 may be supplied with pyrolysis gas and oxygen, or oxygen may be supplied from the outside to the combustion device 40 when the pyrolysis gas is supplied.

The air atmosphere refers to the state of being exposed to the colorless and transparent mixed gas that constitutes the lower atmosphere surrounding the earth. Air includes oxygen, nitrogen, etc., and the content of oxygen in the air inside the combustion device 40 of the present specification may be at least 10 vol% or more among the total air content.

The combustion device 40 may include a direct combustion method in which the pyrolysis gas and the heating material are in direct contact and an indirect combustion method in which the pyrolysis gas comes into contact with a member heated by the heating material and is burned.

The continuous waste disposal system 100 according to the present invention may further include a transfer pipe 41 for continuously moving pyrolysis gas from the pyrolysis device 30 to the combustion device 40 . The transfer pipe 41 may include a suction part (not shown) for sucking in the pyrolysis gas inside the pyrolysis device 30 and discharging it into the transfer pipe 41 . For example, the suction unit may include a blower, a ventilator, an air conveyor, and the like.

The continuous waste disposal system 100 may further include a carrier gas supply unit (not shown) for supplying carrier gas to the transfer pipe 41 .

The transfer pipe 41 may mix the pyrolysis gas supplied from the pyrolysis device 30 with the carrier gas and move the pyrolysis gas to the combustion device. The carrier gas may include a gas having low reactivity with the pyrolysis gas, and the carrier gas may include an inert gas.

Alternatively, since the carrier gas is supplied to the combustion device 40 together with the pyrolysis gas, and the combustion device 40 burns the pyrolysis gas in an air atmosphere, the carrier gas may include oxygen.

The cooling device 50 rapidly cools the pyrolysis gas discharged from the combustion device 40 .

In one embodiment, the cooling device 50 may have a structure in which a cooling pipe is wound around a container in which the pyrolysis gas is stored. The internal temperature of the cooling device 50 is lowered by the cooling pipe, and pyrolysis gas having a high temperature due to high-temperature combustion meets a low-temperature atmosphere and is rapidly cooled.

The cooling device 50 according to an exemplary embodiment may include a plurality of containers having different cooling pipe temperatures.

In another embodiment, the cooling device 50 may be located on the outer surface of the pipe through which the pyrolysis gas is discharged from the combustion device 40 . For example, when the cooling device 50 is provided in the form of a cooling pipe, the cooling pipe may be provided in a structure in which the cooling pipe is wound around the outer surface of the pipe through which the pyrolysis gas is discharged, and the pyrolysis gas may be rapidly cooled while being discharged into the pipe. there is.

Cooling water or gas such as carbon dioxide or helium may be supplied to the inside of the cooling pipe.

3 is a schematic diagram showing a continuous waste disposal system 100' according to another embodiment of the present invention.

A continuous waste treatment system 100' according to another embodiment includes a waste pump 10, a dewatering device 60, a drying device 20, a pyrolysis device 30, a combustion device 40, and a cooling device 50. , a dust collector 70 and a scrubber 80.

The continuous waste disposal system 100' according to another embodiment may refer to the description of the overlapped configuration among the continuous waste treatment system 100 according to one embodiment.

The dehydration device 60 separates liquid and solid using rotational force, and may include a screw decanter type centrifugal separator. The dehydration device 60 may adjust the water content of the waste by adjusting the rotational speed of the screw decanter.

The dust collector 70 primarily filters the pyrolysis gas cooled in the cooling device 50, including a bag filter.

It is connected to the scrubber 80 to receive filtered purified gas and remove fine particles included in the gas.

The scrubber 80 receives the pyrolysis gas primarily filtered by the dust collector 70 and secondarily filters it to discharge the purified gas from which fine particles are removed to the atmosphere. The scrubber 80 is a wet scrubber and may include an organic solvent scrubber and a base solution scrubber. At this time, one or more organic solvent scrubbers may be provided.

The scrubber 80 includes a measuring unit (not shown), and the measuring unit can measure the concentration of organic substances and harmful chlorine compounds in the waste liquid discharged after filtering.

The measuring unit may recover the waste liquid to the waste storage unit when the concentrations of organic substances and harmful chlorine compounds in the waste liquid are measured above a predetermined standard.

The continuous waste disposal system 100' according to another embodiment may further include a blower (not shown) for moving the purified air discharged from the scrubber 80 to the exhaust.

The scrubber 80 is provided with a discharge pipe for discharging the purified gas by proxy, and a blower may be located inside the discharge pipe.

Therefore, in the continuous waste disposal system 100', the components included between the transfer pipe 41 and the dust collector 70 can maintain a negative pressure state, and the pyrolysis gas can be continuously moved without the need for a separate transport process and configuration. can

The continuous waste disposal system 100, 100' according to the present invention includes a sensor (not shown) in all components, so that the entire process is automatically performed and monitored by data checked by the sensor.

The continuous waste treatment process according to the present invention includes spray drying the waste (S10), pyrolysis (S20), burning (S30) and cooling (S40).

The step of spray drying the waste (S10) is a step of spraying the waste in the form of sludge and contacting it with a heat source to dry the waste in the form of particles.

Waste to be treated in the present invention may be in the form of sludge having a moisture content of 40 to 99.5%. Wastes obtained in the field of chemical processing have a form of sludge in which solid particles and moisture generated during the process are mixed. chloride monomer), etc., may include solid precipitates generated while treating wastewater and wastewater generated during the manufacturing process. In addition, the waste contains harmful chlorine components such as polychlorinated biphenyl, polychlorinated dibenzo-p-dioxin, polychlorinated dibenzofuran, and chlorophenol. It may be included at a concentration of about 10,000 to 20,000 ppm. In addition, the waste may contain an organic material and an inorganic material in a ratio of approximately 1:1.

In the step of spray drying the waste (S10), when the waste is sprayed with fine liquid particles, the surface area of the fine liquid particles increases, and moisture can be evaporated within a short time. Thus, waste can be produced in the form of solid particles.

The waste is sprayed into liquid particles having a uniform particle size, and the dried waste particles may also have a uniform particle size.

The reason why the particle size of the waste particles is made uniform in this step is that the weight of the waste particles varies according to the particle size of the waste particles, and when the weight of the waste particles is different, the time the waste particles stay inside the pyrolysis device becomes different. can In other words, waste particles with a large particle size have a short residence time inside the pyrolysis device, so heat transfer to harmful compounds in the waste does not occur, and thermal decomposition does not occur. because it can

Therefore, when the particle size of the waste particles is uniform, the heat transfer to the harmful compounds in the waste is smooth and the thermal decomposition of the waste particles can be uniformly performed.

The average particle diameter (D ₅₀ ) of the waste particles, that is, the primary waste particles, may be greater than 0 mm and less than or equal to 3 mm, may be 0.45 mm to 2.2 mm, may be 0.55 mm to 1.8 mm, , can be made from 0.9 mm to 1.1 mm.

In the present specification, 'primary particle' means a single particle, that is, one particle, and 'secondary particle' means an aggregate in which a plurality of primary particles are aggregated by an intentional assembly or bonding process. do.

If the particle diameter of the waste particles exceeds 3 mm, the surface area is relatively small, making it difficult to smoothly transfer heat, and also difficult to transfer heat to the inner center of the particles. This is because, in particular, the effect of such a difference in particle size may be more significant based on the particle size of 3 mm.

In the step of spray-drying the waste (S10), waste particles may be produced by drying liquid particles of the sprayed waste at a temperature of 150° C. to 250° C. In other words, the internal temperature of the drying device may be 150 °C to 250 °C, preferably 180 °C to 200 °C.

If the drying temperature condition is less than the above range, the moisture content of the waste particles is high, and a problem in that the heat transfer rate to the waste particles is reduced in the subsequent thermal decomposition step (S20) may occur. And, if the drying temperature conditions exceed the above range, the waste particles may be thermally decomposed.

The thermal decomposition step (S20) is a step of thermally decomposing the waste particles into pyrolysis sludge and pyrolysis gas in an oxygen-free atmosphere.

The thermal decomposition step (S20) may be carried out in a low-temperature anoxic atmosphere. In low-temperature thermal decomposition and anoxic conditions, a dechlorination reaction in which the C-Cl bond of harmful chlorine compounds in waste is broken or a self-decomposition reaction of harmful chlorine compounds occurs smoothly. On the other hand, in conditions where oxygen is present in excess of 3%, oxygen reacts with organic matter and harmful chlorine compounds in the waste to form another harmful chlorine compound or the decomposed harmful chlorine compound may be resynthesized. am. The oxygen-free atmosphere may be specifically a nitrogen atmosphere, an inert atmosphere or a vacuum atmosphere. The inert atmosphere may be an argon atmosphere or a helium atmosphere. Among them, when a nitrogen atmosphere is applied as an oxygen-free atmosphere, it is economical because relatively cheap nitrogen can be used, and there is an advantage in that it is easy to create an atmosphere.

The temperature condition of the low-temperature thermal decomposition in the thermal decomposition step (S20) may be 350 to 500 °C, preferably 350 to 450 °C. When the temperature of the low-temperature pyrolysis is within the above-described range, the final harmful compound removal rate may be higher in view of the connection with the high-temperature combustion step described later. In particular, when the temperature of the low-temperature pyrolysis is lower than the above-mentioned range, sufficient removal of harmful compounds may not occur, and when the temperature of the low-temperature pyrolysis is higher than the above-mentioned range, the removal efficiency of harmful chlorine compounds is hardly improved. A significant increase may deteriorate the economics of the overall process.

The low-temperature thermal decomposition time in the thermal decomposition step (S20) may be 2 to 6 hours, preferably 3 to 5 hours. If the low-temperature thermal decomposition time is too short, harmful compounds cannot be sufficiently thermally decomposed, and if the low-temperature thermal decomposition time is too long, the effect of increasing the removal rate of harmful compounds is insignificant compared to the increase in energy consumption.

The burning step (S30) is a step of burning the pyrolysis gas generated in the pyrolysis step (S20) together with air.

In the thermal decomposition step, harmful compounds in the waste are decomposed to form gases, and some of the formed gas components may still have harmful properties. Therefore, it is necessary to additionally burn and remove gaseous harmful compounds. Hazardous compounds in the gaseous phase remaining through combustion in this step can be converted into harmless low-molecular compounds such as carbon dioxide or water.

In the combustion step, it is preferable to introduce air or oxygen together with the gas generated in the above-mentioned pyrolysis step.

According to one embodiment, the temperature in the combustion step may be 900 °C to 1,200 °C, preferably 1,000 °C to 1,200 °C. When the temperature in the combustion step is lower than the lower limit of the above range, the remaining gaseous hazardous compounds cannot be sufficiently oxidized, and when it is higher than the upper limit of the above range, the amount of energy used for combustion is excessive, which may deteriorate the economics of the overall treatment process. can

The time of the burning step may be 5 to 60 minutes, preferably 15 to 30 minutes. If the time of the combustion step is too short, sufficient oxidation cannot be performed, and if it is too long, the amount of energy used for combustion is excessive, as in the case of temperature, and thus the economic feasibility of the overall treatment process may be deteriorated.

The cooling step (S40) is a step of rapidly cooling the pyrolysis gas burned in the combustion step (S30).

Harmful compounds that are not completely decomposed and removed may remain even after the above-described pyrolysis step (S20) and combustion step (S30), and harmful compounds that are partially decomposed may be re-synthesized into harmful compounds thereafter. Therefore, in order to prevent such resynthesis, it is preferable to remove energy required for resynthesis by cooling the combustion gas in which undecomposed harmful compounds may remain.

The cooling may be performed through a commonly used process, for example, a process using low-temperature water or cooling water, and is preferably rapid cooling to minimize resynthesis. For example, cooling may be performed by passing low-temperature water or cooling water using a circulator around a tube through which exhaust gas passes.

The continuous waste treatment process may further include selecting particles (S11).

The step of sorting the particles (S11) is a step of sorting the waste particles produced in the step of spray drying the waste (S10) to select only particles having a particle diameter of 2 mm or less.

The waste particles produced in the step of spray drying the waste (S10) have a moisture content of 1 to 20%, and the waste particles exhibit a uniform size.

In the step of selecting particles (S11), when waste particles having a particle diameter of more than 2 mm are produced in the step of spray-drying the waste (S10), waste particles having a particle diameter of more than 2 mm among uniformly sized waste particles are selected. It is a step.

The continuous waste treatment process may further include crushing waste particles having a particle diameter of more than 2 mm (S12).

The crushing step (S12) may use a general process known to be used for crushing waste particles having a particle diameter exceeding 2 mm, and may be performed using, for example, a general crusher. Specifically, a jaw crusher or the like can be used. In the classifying step, a known method of separating particles by size may be used, and a process using a sieve may be used.

The continuous waste treatment process may further include a post-processing step (S50) to remove, when trace amounts of harmful and acidic gases still remain after the above-described cooling step (S40). For example, the waste treatment process may further include a scrubbing step (S51) of passing the combustion gas cooled in the cooling step through a scrubber and/or a dust collection step (S52) of passing the combustion gas cooled in the cooling step through a dust collector. can The scrubbing step (S51) and the dust collecting step (S52) may include either one or both.

Most of the harmful compounds can be removed through the post-treatment step.

The scrubber used in the scrubbing step (S51) may include at least one of an organic solvent scrubber for removing organic gas and a base solution scrubber for removing acid gas. The combustion gas may pass through an organic solvent scrubber and then a base solution scrubber. A toluene scrubber may be used as the organic solvent scrubber, and a sodium hydroxide scrubber may be used as the base solution scrubber. When using the above scrubber, the effect of removing harmful compounds can be maximized.

The dust collector used in the dust collection step (S52) may include a bag filter or the like.

In the post-processing step, when both the scrubbing step (S51) and the dust collection step (S52) are included, the order is not particularly limited, and the cooled combustion gas is passed through a dust collector, then passed through a scrubber, The cooled combustion gases can be passed through a scrubber and then through a dust collector. From the viewpoint of removing harmful gases, it may be more preferable to first pass through a dust collector among scrubbers and dust collectors.

The continuous waste treatment process may further include a step (S60) of recovering pyrolysis sludge generated by pyrolysis of the waste after the pyrolysis step (S20).

The sludge recovery step (S60) is a step of recovering the sludge in the pyrolysis device or the dust collector for the continuous performance of the pyrolysis step (S20), and the sludge can be recovered when the temperature of the sludge is reduced to room temperature or below room temperature. .

The sludge can be cooled naturally in the pyrolysis unit or rapidly cooled when discharged through the sludge outlet.

Hazardous compounds that are not completely decomposed and removed may remain in the sludge, and toxic compounds that are partially decomposed may be re-synthesized into toxic compounds later. Therefore, in order to prevent such resynthesis, it is preferable to remove the energy required for resynthesis by cooling the sludge in which undecomposed harmful compounds may remain.

The sludge recovery step (S60) may further include a step (S61) of re-supplying the sludge to the pyrolysis device.

Harmful compounds included in the waste may be completely decomposed through the pyrolysis step, or may be included in gas and sludge generated by pyrolysis of the waste. Therefore, after measuring the concentration of harmful compounds (toxic) in the sludge, if the concentration of harmful compounds exceeds the standard value, the sludge can be re-supplied to the pyrolysis device.

The continuous waste treatment process may refer to a description of a redundant configuration of the continuous waste treatment system 100 according to an embodiment.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the claims below. You will understand that it can be done.

100, 100': continuous waste disposal system
10: waste pump
20: drying device
21: drying chamber
22: injection nozzle
23: heat source supply unit
24: gas heating unit
25: gas supply unit
30: pyrolysis device
31: feeder
40: combustion device
41: transfer pipe
50: cooling device
60: dewatering device
70: dust collector
80: scrubber

Claims (13)

a waste pump continuously supplying waste;
a drying device that sprays the waste into contact with a heat source to dry the waste into particles;
a pyrolysis device for thermally decomposing the particulate waste into pyrolysis sludge and pyrolysis gas;
A combustion device that burns the pyrolysis gas, and
A cooling device for rapidly cooling the burnt pyrolysis gas
A continuous waste treatment system comprising a. The continuous waste disposal system according to claim 1, further comprising a gas heating unit for heating and supplying gas to the drying device. 3. The continuous waste disposal system according to claim 2, wherein the gas comprises an inert gas. The continuous waste disposal system according to claim 1, further comprising a feeder continuously supplying the particulate waste discharged from the drying device to the pyrolysis device. The method according to claim 4, wherein the feeder comprises a measuring unit for measuring the size of the particle-shaped waste and a particle sorting unit for sorting the waste whose size is less than or equal to a pre-stored standard value and the waste that exceeds the standard value Continuous waste disposal system. The continuous waste disposal system according to claim 5, further comprising a crushing unit for crushing the waste exceeding the reference value. The continuous waste disposal system according to claim 1, further comprising a transfer pipe for continuously transferring the pyrolysis gas from the pyrolysis device to the combustion device. The continuous waste disposal system according to claim 7 , wherein the transfer pipe mixes the pyrolysis gas with a carrier gas and transfers the pyrolysis gas to the combustion device. Spray-drying sludge-type waste to form particles;
Pyrolyzing the particles into pyrolysis sludge and pyrolysis gas in an oxygen-free atmosphere;
Combusting the pyrolysis gas generated in the pyrolysis step with air; and
Rapidly cooling the pyrolysis gas burned in the combustion step
Continuous waste treatment process comprising a. The continuous waste treatment process according to claim 9, wherein the particles are primary particles, and the average particle diameter of the primary particles is greater than 0 mm and less than or equal to 3 mm. The continuous waste treatment process according to claim 9, wherein the step of preparing the particles in the form of particles is performed by drying the waste in the form of sludge at a temperature of 150 ° C to 250 ° C. The continuous waste treatment process according to claim 9, further comprising the step of classifying the waste in particle form and selecting only the particles having an average particle diameter of greater than 0 mm and less than or equal to 3 mm. 13. The continuous waste treatment process according to claim 12, further comprising the step of grinding said particles having an average particle diameter greater than 3 mm.