KR102603124B1 - Multi-stage continuous pyrolysis reactor of molten salt type - Google Patents

Abstract

The present invention relates to a molten salt type multi-stage continuous pyrolysis reactor, and more specifically, to a molten salt type multi-stage continuous pyrolysis reactor that thermally decomposes polymer waste such as waste plastic in multiple stages continuously in an oxygen-free or diluted oxygen condition.
The molten salt type multi-stage continuous pyrolysis reactor according to the present invention has an inlet 110 through which polymer waste is introduced on one upper side, and an outlet 120 through which slag composed of ash and undissolved carbon is discharged on one side of the lower part. Reactor body (100); A pyrolysis furnace 200 of a multi-stage structure disposed horizontally inside the reactor body 100 and thermally decomposing polymer waste while moving in a zigzag shape; A drive sprocket 330 coupled to the drive shaft 310 installed on one side of the pyrolysis furnace 200; A driven sprocket 340 coupled to the driven shaft 320 installed on the other side of the pyrolysis furnace 200; A chain 350 connected between the drive sprocket 330 and the driven sprocket 340 and moved in an endless orbit; A plurality of transfer members 360 installed on the chain 350 at predetermined intervals to transport polymer waste while moving circularly with the chain 350; and a molten salt circulation unit 400 connected to the outside of the reactor main body 100 to circulate liquid molten salt, which is a heat transfer medium.

Description

Multi-stage continuous pyrolysis reactor of molten salt type}

The present invention relates to a molten salt type multi-stage continuous pyrolysis reactor, and more specifically, to a molten salt type multi-stage continuous pyrolysis reactor that thermally decomposes polymer waste such as waste plastic in multiple stages continuously in an oxygen-free or diluted oxygen condition.

In general, polymer waste, including waste synthetic resin, waste plastic, waste rubber, waste vinyl, waste tires, etc., is sorted and selected and used as recycled or recycled raw materials. However, most of them are incinerated or landfilled, which not only wastes resources but also causes air pollution. and causing serious environmental pollution of the soil.

Recently, due to the rise in oil prices of petroleum, which is a raw material for plastic raw materials and fuel oil, measures for circular use of resources are being sought. As part of this, pyrolysis emulsification is a method of obtaining fuel oil (oil) by pyrolyzing polymer waste. Technologies are constantly being developed.

Thermal decomposition emulsification of polymer waste is a technology that converts polymer waste into liquid fuel through a pyrolysis process that breaks the carbon chains that make up polymer raw materials by applying heat under oxygen-free or rarefied oxygen conditions to produce low molecules. The generated fuel oil (oil) is mainly used for industrial purposes. It is used as an alternative fuel or petrochemical raw material.

An example of this technology is disclosed in Document 1 below.

Patent Document 1 includes a cylindrical heating furnace that is arranged horizontally and rotates by a rotational force provided by a motor, and heats the input waste plastic and waste vinyl by stirring them with a solvent using a screw; A separation device that separates the gas discharged from the heating furnace into heavy oil gas and diesel gas; A cooling device that cools and liquefies the diesel gas separated by the separation device; a gas storage unit that stores and liquefies the cooling gas and diesel oil cooled by the cooling device; and a gas supply unit that re-supplies the cooling gas that has not been liquefied by the gas storage unit to the heating furnace. A comprehensive emulsification device for waste plastic and waste vinyl is disclosed.

However, the conventional technology as described above selects the so-called batch type in which continuous input of waste is not possible during the process due to reasons such as maintaining a vacuum inside the heating furnace. For this reason, only a certain amount of waste is processed in one process, which leads to a decrease in workability and productivity.

In addition, while the reaction progresses in the heating furnace, the oil vapor goes through a separation process based on specific gravity through a separation device. This separation process is not carried out smoothly, which not only reduces productivity, but also requires a large amount of waste to be removed during the pyrolysis melting process. There is a problem that economic feasibility and yield decrease as energy is consumed.

An example of a technology to solve the above problem is disclosed in Document 2 below.

Patent Document 2 includes an input unit provided with a hopper for inputting plastic; A heating furnace equipped with a burner to create a high-temperature environment inside and equipped with a combustion gas outlet; One end is connected to the input unit, and both ends penetrate the heating furnace to be exposed to the outside, and a transport compression means is installed to transport and compress the plastic in one direction along the internal longitudinal direction. a melting furnace provided with a steam outlet for melting and discharging water vapor resulting from compression and melting of the plastic; a first transfer unit connected to the other end of the melting furnace to transfer the melted plastic; One end is connected to the first transfer unit, it penetrates the heating furnace so that both ends are exposed to the outside, and a transfer means for transporting the melt in one direction along the internal longitudinal direction is installed to transport and thermally decompose the melt, A vacuum pyrolysis furnace equipped with an oil vapor outlet for transporting melt and discharging oil vapor resulting from pyrolysis; a second transfer unit connected to the other end of the vacuum pyrolysis furnace to transfer the pyrolysis residue of the melt; a discharge unit connected to the second transfer unit to discharge the pyrolysis residue; a first condenser connected to the steam outlet to condense water vapor; a second condenser connected to the oil vapor outlet to condense the oil vapor; a plurality of third condensers each connected to the second condenser via first, second, and third valves; Vacuum pumps each connected to a plurality of third condensers via fourth, fifth, and sixth valves; A thermal decomposition emulsification system for plastics is disclosed, which includes a fourth condenser connected to the vacuum pump.

However, in the conventional technology as described above, not only is the transfer of the melt not smooth during the process of transferring the melt by a transfer means consisting of a spiral screw structure that rotates inside the vacuum pyrolysis furnace, but also the melt is caught by foreign substances in the melt. A deterioration or sticking phenomenon occurs, which ultimately interferes with the transport operation of the transport means and causes a bottleneck phenomenon of the melt.

In addition, since the waste plastic is melted as it moves in one direction along the inner wall of the pyrolysis furnace due to the unidirectional rotation of the transport means, uneven heating of the waste plastic may cause coking, which may affect the lifespan of the equipment. , there is a problem of high energy consumption and processing costs.

Republic of Korea Registered Utility Model Publication No. 20-0452087 (announced on February 1, 2011) Republic of Korea Patent Publication No. 10-1910750 (announced on October 22, 2018)

The present invention was developed to solve the problems described above. It enables efficient operation and improves heat transfer efficiency by independently controlling the temperature of each stage of the pyrolysis furnace and the transfer speed of polymer waste and transfer members. The purpose is to provide a molten salt type multi-stage continuous pyrolysis reactor.

In addition, the purpose of the present invention is to provide a molten salt type multi-stage continuous pyrolysis reactor that can induce a uniform and stable flow of molten salt by disposing a plurality of overflow walls on the molten salt circulation passage.

In addition, the structure of drying and pyrolysis by scraping the polymer waste input into the pyrolysis reactor not only enables the smooth movement of the polymer waste, but also disperses it evenly and prevents the phenomenon of jamming or sticking (coking phenomenon) caused by foreign substances in the polymer waste. The purpose is to provide a molten salt type multi-stage continuous pyrolysis reactor that can prevent.

In addition, the purpose is to provide a molten salt type multi-stage continuous pyrolysis reactor that can be used for drying furnaces, carbonization furnaces, etc.

In order to achieve the above object, the molten salt type multi-stage continuous pyrolysis reactor according to the present invention is formed with an inlet 110 through which polymer waste is input on one side of the upper part, and an outlet through which slag consisting of ash and undissolved carbon is discharged on one side of the lower part. A reactor body (100) in which (120) is formed; A pyrolysis furnace 200 of a multi-stage structure disposed horizontally inside the reactor body 100 and thermally decomposing polymer waste while moving in a zigzag shape; A drive sprocket 330 coupled to the drive shaft 310 installed on one side of the pyrolysis furnace 200; A driven sprocket 340 coupled to the driven shaft 320 installed on the other side of the pyrolysis furnace 200; A chain 350 connected between the drive sprocket 330 and the driven sprocket 340 and moved in an endless orbit; A plurality of transfer members 360 installed on the chain 350 at predetermined intervals to transport polymer waste while moving circularly with the chain 350; and a molten salt circulation unit 400 connected to the outside of the reactor main body 100 to circulate liquid molten salt, which is a heat transfer medium, wherein the pyrolysis furnace 200 is located at the uppermost part, A drying stage 210 that removes moisture in the pores of the polymer waste in a temperature range of ℃; A melting stage 220 located below the drying stage 210 and melting and liquefying polymer waste in a temperature range of 100 to 300° C.; A decomposition stage 230 located below the melting stage 220 and vaporizing and decomposing the polymer waste melt in a temperature range of 200 to 400° C.; and a carbonization stage 240 located at the lower part of the decomposition stage 230, where slag composed of ash and undecomposed carbon is generated in a temperature range of 300 to 450° C., wherein the pyrolysis furnace 200 has a rectangular shape. It is made in the shape of a duct, and the transfer member 360 is made in the shape of a square plate, and moves while scraping polymer waste by the continuous circulation of the transfer member 360 together with the chain 350, and falls to the next stage. It has a structure in which thermal decomposition proceeds while moving again, and on the molten salt circulation passage 130 of the reactor main body 100, a plurality of overflow walls 500 are positioned in parallel without overlapping each other with respect to the flow direction of the molten salt. The overflow walls 500 are arranged in a series of alternating directions, and the overflow walls 500 are inclined at a predetermined angle with respect to the flow direction of the molten salt, and through passages 510 are formed between and at the ends of the overflow walls 500, respectively.

In addition, the transfer members 360 are formed in a plate shape, and are arranged to be staggered, with one end positioned close to the inner wall of the pyrolysis furnace 200.

delete

delete

delete

In addition, a plurality of weight reduction grooves 361 are formed on both sides and the center of the transfer member 360 to reduce the weight.

In addition, the molten salt circulation unit 400 includes a molten salt tank 410 in which molten salt is stored; A molten salt boiler 420 connected to the molten salt tank 410 to heat the molten salt; A molten salt supply line 430 that supplies high-temperature molten salt heated by the molten salt boiler 420 to the molten salt circulation passage 130 of the reactor main body 100; a molten salt discharge line 440 that discharges low-temperature molten salt from the molten salt circulation passage 130 of the reactor main body 100 to the molten salt tank 410; A plurality of valves 450 installed on the molten salt supply line 430 to control fluid flow in each line; Temperature sensors 460 installed in each of the pyrolysis furnaces 200 to detect the temperature of molten salt; And a control unit 470 that controls the temperature of the pyrolysis furnace 200 by adjusting the flow rate of molten salt by the valve 450 through the temperature value measured by the temperature sensor 460. do.

In addition, the molten salt circulation unit 400 includes a molten salt tank 410 in which molten salt is stored; A molten salt boiler 420 connected to the molten salt tank 410 to heat the molten salt; A molten salt supply line 430 that supplies high-temperature molten salt heated by the molten salt boiler 420 to the molten salt circulation passage 130 of the reactor main body 100; a molten salt discharge line 440 that discharges low-temperature molten salt from the molten salt circulation passage 130 of the reactor main body 100 to the molten salt tank 410; A plurality of valves 450 installed on the molten salt supply line 430 to control fluid flow in each line; Temperature sensors 460 installed in each of the pyrolysis furnaces 200 to detect the temperature of molten salt; a control unit 470 that controls the temperature of the pyrolysis furnace 200 by adjusting the flow rate of molten salt by the valve 450 through the temperature value measured by the temperature sensor 460; A preheater 491 installed on one side of the molten salt tank 410 to preheat the molten salt; a molten salt return line 492 that returns molten salt heated by the molten salt boiler 420 to the molten salt tank 410; and a molten salt drain line 493 connected between the molten salt tank 410 and the molten salt supply line 430 and provided with a drain valve 494 on one side.

As described above, the molten salt type multi-stage continuous pyrolysis reactor according to the present invention enables efficient operation by independently controlling the temperature of each stage of the pyrolysis furnace and the transfer speed of polymer waste, transfer members, etc., and improves heat transfer efficiency. It works.

In addition, by disposing a plurality of overflow walls on the molten salt circulation passage, a uniform and stable flow of molten salt is induced, which has the effect of increasing heat transfer efficiency in the lower region as well as the upper region of the circulation passage.

In addition, the structure of drying and pyrolysis by scraping the polymer waste input into the pyrolysis reactor not only enables the smooth movement of the polymer waste, but also disperses it evenly and prevents the phenomenon of jamming or sticking (coking phenomenon) caused by foreign substances in the polymer waste. It is effective in preventing.

In addition, it has the effect of improving quality by shortening the pyrolysis time, reducing pyrolysis costs, increasing pyrolysis yield, and reducing foreign substances (ash).

Figure 1 is a perspective view showing a molten salt type multi-stage continuous pyrolysis reactor according to the present invention.
Figure 2 is a front cross-sectional view showing a molten salt type multi-stage continuous pyrolysis reactor according to the present invention.
Figure 3 is a side cross-sectional view showing a molten salt type multi-stage continuous pyrolysis reactor according to the present invention.
Figure 4 is a plan view showing the transfer member of the molten salt type multi-stage continuous pyrolysis reactor according to the present invention.
Figure 5 is an exemplary diagram showing a conveying member of a molten salt type multi-stage continuous pyrolysis reactor according to the present invention.
Figure 6 is an exemplary diagram showing the overflow wall of a molten salt type multi-stage continuous pyrolysis reactor according to the present invention.
Figure 7 is a view showing another example of the molten salt circulation section in the molten salt type multi-stage continuous pyrolysis reactor according to the present invention.

Hereinafter, the most preferred embodiments of the present invention will be described in detail in order to enable those skilled in the art to easily practice the present invention.

As shown in Figures 1 to 3, the molten salt type multi-stage continuous pyrolysis reactor according to the present invention includes a reactor main body 100, a pyrolysis furnace 200, a drive shaft 310, a driven shaft 320, and a drive sprocket ( 330), a driven sprocket 340, a chain 350, a transport member 360, and a molten salt circulation unit 400.

The reactor main body 100 creates an atmosphere in which polymer waste can be thermally decomposed by heating the pyrolysis furnace 200 with molten salt supplied from the molten salt circulation unit 400.

The reactor main body 100 has an inlet 110 through which polymer waste is introduced on one side of the upper part, and an outlet 120 through which slag consisting of ash and undecomposed carbon is discharged is formed on one side of the lower part.

Polymer waste such as waste plastic introduced into the reactor main body 100 is gradually heated in a temperature range of 80 to 450° C. and undergoes moisture drying, polymer waste melting, pyrolysis, and slag processes. The results of the pyrolysis reaction are divided into mixed vapor consisting of water vapor and pyrolysis gas, and slag consisting of ash and trace amounts of undecomposed carbon.

The pyrolysis furnace 200 is arranged horizontally inside the reactor main body 100 and has a multi-stage structure in which polymer waste pyrolyzes while moving in a zigzag shape. This pyrolysis furnace 200 includes a drying stage 210, a melting stage 220, a decomposition stage 230, and a carbonization stage 240.

To elaborate, the drying stage 210 is located at the top and is an area that removes moisture in the pores of the polymer waste in a temperature range of 80 to 150°C.

The melting stage 220 is located below the drying stage 210 and is an area that melts and liquefies polymer waste in a temperature range of 100 to 300°C.

The decomposition stage 230 is located below the melting stage 220 and is an area that vaporizes and decomposes the polymer waste melt in a temperature range of 200 to 400°C.

The carbonization stage 240 is located below the decomposition stage 230, and is an area where slag composed of ash and undecomposed carbon is generated in a temperature range of 300 to 450°C.

In the present invention, drying and thermal decomposition of polymer waste is achieved under the above-described region and temperature conditions, but the present invention is not limited to this, and the thermal decomposition furnace 200 may be additionally configured and various temperatures may be applied.

Meanwhile, if a fire occurs in the pyrolysis furnace 200, the fire can be extinguished by nitrogen purging, and if the flow of molten salt is poor when draining the molten salt, nitrogen is supplied to improve the flow of the molten salt. Additionally, in cases where draining of molten salt is urgent due to valve failure, etc., the drain time can be shortened by pushing out the molten salt through nitrogen purging before the molten salt hardens.

Additionally, the pyrolysis zone must be deoxygenated before pyrolysis begins. There are two ways to remove oxygen: one is to supply nitrogen to push out oxygen, and the other is to supply water vapor to push out oxygen. In particular, in order to discharge oxygen from the pyrolysis zone before the start of pyrolysis, a method may be used in which water is supplied rather than injected, and as the pyrolysis furnace is heated, it evaporates to form water vapor, and this water vapor pushes out the oxygen.

In addition, if the molten salt is not drained and accumulates in the pyrolysis furnace and pipes, water vapor is sent to the molten salt area inside the pyrolysis furnace, pipes, etc. to melt the molten salt and prevent flow, thereby melting the molten salt and smoothing the flow.

The driving sprocket 330 is coupled to the driving shaft 310 installed on one side of the pyrolysis furnace 200.

The driven sprocket 340 is coupled to the driven shaft 320 installed on the other side of the pyrolysis furnace 200.

Here, the driving sprocket 330 receives power from the motor 370 and rotates. The motor 370 is installed outside the reactor main body 100, and a reducer 380 is installed on the axis of the motor 370. The reducer 380 and the drive shaft 310 are installed to be connected, so that when the motor 370 operates, the drive sprocket 330 rotates through the drive shaft 310.

The chain 350 connects the drive sprocket 330 and the driven sprocket 340 and moves in an endless orbit.

The installed number, diameter, gear ratio, etc. of each drive shaft 310, driven shaft 320, drive sprocket 330, driven sprocket 340, and chain 350 applied to the present invention depends on the characteristics of the device to which the drive unit is applied. Since it can be changed as much as necessary, there are no special restrictions.

A plurality of transfer members 360 are installed on the chain 350 at predetermined intervals and move in circulation with the chain 350 to transfer polymer waste. That is, the polymer waste is pyrolyzed while moving through the multi-stage pyrolysis furnace 200 by the continuous circulation of the transfer member 360 together with the chain 350.

According to the above configuration, the present invention moves the polymer waste input into the reactor main body 100 while scraping it, drops it to the next stage, and then moves it again to proceed with pyrolysis, enabling smooth movement of the polymer waste. In addition, it can be evenly dispersed and prevent jamming or sticking caused by foreign substances in polymer waste.

As shown in FIG. 4, the transfer members 360 are formed in a plate shape, and are preferably arranged to be staggered, with one end close to the inner wall of the pyrolysis furnace 200. Additionally, the transfer members 360 may be arranged to be partially staggered as needed.

In this way, as the plurality of transfer members 360 are arranged in an alternating manner, the polymer waste can be prevented from remaining in the space between the transfer members 360 and the wall by scraping close to the inner wall of the pyrolysis furnace 200. there is.

In particular, if all the transfer members 360 are placed close to the inner wall of the pyrolysis furnace 200, the motor will be overloaded due to friction with the wall, which will hinder normal operation. Therefore, the transfer members 360 are alternately placed close to the inner wall of the pyrolysis furnace 200 to scratch the wall, thereby minimizing friction with the wall, reducing the load on the motor, and maintaining the wall in normal operation. Scraping can prevent polymer materials attached to the wall from sticking.

As shown in FIG. 5, a plurality of weight reduction grooves 361 may be formed on both sides and the center of the transfer member 360 to reduce weight.

By reducing the weight of the transfer member 360 by forming the weight reduction groove 361, noise can be prevented while moving the transfer member 360 and the transfer load can be reduced.

Generally, the lower part of the pyrolysis zone is the area where heat transfer is needed the most and has the largest area, so it is very important to increase heat transfer to the lower part. In order to transfer heat to the lower part, there must be a lot of heat passing through the lower part, but since heat usually moves to the upper part, the heat passes through without heating the lower part. In other words, the heat heating the lower part is transferred through a vortex of heat rising to the upper part.

As shown in FIG. 6, on the molten salt circulation passage 130 of the reactor main body 100, a plurality of overflow walls 500, which do not overlap each other and are located in parallel, may be continuously arranged to alternate with each other with respect to the flow direction of the molten salt. there is.

The overflow wall 500 is preferably disposed inclined at a predetermined angle with respect to the flow direction of molten salt, and through passages 510 are formed between and at the ends of the overflow walls 500, respectively.

For example, when molten salt flows in a state other than full flow, heat transfer efficiency in the upper region of the circulation passage 130 is low. In order to solve this problem, in the present invention, a plurality of overflow walls 500 are arranged in succession to alternate with each other on the molten salt circulation passage 130.

The overflow wall 500 partially blocks the flow of molten salt, attenuates the kinetic energy of the molten salt, and induces a uniform and stable flow of the molten salt, thereby increasing the heat transfer efficiency of the upper region as well as the lower region of the circulation passage 130. .

The through passage 510 allows the molten salt to flow downstream without passing over the overflow wall 500 to maintain continuous fluidity of the molten salt.

As shown in Figures 1 and 2, the molten salt circulation unit 400 is connected to the outside of the reactor main body 100 and circulates liquid molten salt, which is a heat transfer medium.

For example, in the case of a hot air type pyrolysis reactor, the temperature of the entire pyrolysis reactor is determined by the hot air provided from the burner. At this time, as the temperature of the upper part is gradually set lower than the temperature of the lower part, the temperature of each layer is adjusted to a temperature appropriate for the characteristics. There are some difficulties in setting it up.

Accordingly, the present invention enables efficient operation by independently controlling the temperature of each stage of the pyrolysis furnace 200 through the molten salt circulation unit 400.

This molten salt circulation unit 400 includes a molten salt tank 410, a molten salt boiler 420, a molten salt supply line 430, a molten salt discharge line 440, a valve 450, and a temperature sensor 460. and a control unit 470.

The molten salt tank 410 stores molten salt to be supplied to the pyrolysis furnace 200 therein. The molten salt used in the pyrolysis reactor according to an embodiment of the present invention may be a fluid in which salts such as NaNO₃, KNO₃, NaNO₂, etc. are mixed in an appropriate ratio. These molten salts are substances that are solid but change phase into a liquid above the melting point.

The molten salt boiler 420 is connected to the molten salt tank 410 to heat the molten salt to the pyrolysis reaction temperature.

The molten salt boiler 420 can be heated using a heater, gas, liquid, solid fuel, etc. depending on the capacity.

A first pump 490 is installed between the molten salt tank 410 and the molten salt boiler 420, and the first pump 490 transfers the molten salt stored in the molten salt tank 410 to the pyrolysis furnace 200. It plays a role in supplying.

The molten salt supply line 430 supplies high-temperature molten salt heated by the molten salt boiler 420 to the molten salt circulation passage 130 of the reactor main body 100.

An ultrasonic flow meter 480 and a valve 450 may be installed on the molten salt supply line 430 to supply molten salt to the circulation passage 130.

Meanwhile, in order to reduce the temperature difference between the two ends of the molten salt circulation passage 130, the flow rate must be increased, the speed must be increased, and the flow must be supplied at an appropriate temperature. By setting the temperature of the upper layer lower than the temperature of the lower layer and sending the molten salt used in the lower layer to the upper layer, the temperature of the upper layer can be controlled to be lower than that of the lower layer. This means that when the flow rate is controlled in parallel, the flow rate is small and the flow rate is slow, resulting in a large temperature difference between both ends of the circulation passage 130. In this case, when the parallel flow rates are integrated to make the molten salt flow in the circulation passage 130 in series, the flow rate is low. As this becomes faster, the temperature difference between both ends of the circulation passage 130 decreases. Because of this, the temperature difference between both ends of the pyrolysis furnace 200 is also reduced. That is, in order to flow molten salt in series, the molten salt supply line 430 must be connected in series.

The molten salt discharge line 440 discharges low-temperature molten salt from the molten salt circulation passage 130 of the reactor main body 100 to the molten salt tank 410.

The valves 450 are installed in plural numbers on the molten salt supply line 430 to control the fluid flow in each line.

For example, by using the valve 450 as an electric valve, it can be controlled by the control unit 470, making work easy, and automatically controlling the temperature by inputting the set temperature. To this end, an ultrasonic flow meter 480 is installed to detect changes in flow rate due to the operation of the valve 450, and to detect temperature changes accordingly to operate the valve 450 appropriately for the set temperature.

The temperature sensor 460 is installed in each of the thermal decomposition furnaces 200 and detects the temperature of the molten salt.

The control unit 470 controls the temperature of the pyrolysis furnace 200 by adjusting the flow rate of molten salt by the valve 450 through the temperature value measured by the temperature sensor 460.

According to this configuration, the molten salt circulation unit 400 can operate efficiently by independently and precisely controlling the temperature of each stage of the pyrolysis furnace 200, and can improve heat transfer efficiency by molten salt.

Meanwhile, as shown in FIGS. 1 and 7, the molten salt circulation unit 400 is connected to a molten salt tank 410 in which molten salt is stored, and the molten salt tank 410 to heat the molten salt. A molten salt boiler 420, a molten salt supply line 430 for supplying high-temperature molten salt heated by the molten salt boiler 420 to the molten salt circulation passage 130 of the reactor main body 100, and the reactor. A molten salt discharge line 440 that discharges low-temperature molten salt from the molten salt circulation passage 130 of the main body 100 to the molten salt tank 410, and is installed on the molten salt supply line 430 to connect each line. Through a plurality of valves 450 that control the fluid flow, a temperature sensor 460 installed in the pyrolysis furnace 200 to detect the temperature of the molten salt, and the temperature value measured by the temperature sensor 460. A control unit 470 that controls the temperature of the pyrolysis furnace 200 by controlling the flow rate of molten salt by the valve 450, and a preheater 491 installed on one side of the molten salt tank 410 to preheat the molten salt. , a molten salt return line 492 that returns the molten salt heated by the molten salt boiler 420 to the molten salt tank 410, and a connection between the molten salt tank 410 and the molten salt supply line 430. It may include a molten salt drain line 493 provided with a drain valve 494 on one side.

The molten salt tank 410, molten salt boiler 420, molten salt supply line 430, molten salt discharge line 440, valve 450, temperature sensor 460, and control unit 470 are as described above. Since the configuration and operation of one embodiment are the same, detailed description thereof will be omitted.

In addition to the above configurations, a preheater 491, a molten salt return line 492, and a molten salt drain line 493 are additionally configured to allow the molten salt tank 410 to flow solid molten salt at room temperature. The stored molten salt can be preheated with a heater. For example, when the molten salt is partially fluidized and can be pumped, the molten salt boiler 420 is operated, and the heated molten salt is not supplied to the pyrolysis reactor, but is sent to the molten salt tank 410 to form the molten salt tank 410. Make the whole thing flow. In this case, the heater usage time is shortened, there is an advantage in being able to preheat the entire molten salt with low electricity costs, and the preheating time can be reduced by fluidizing the molten salt in a short period of time, thereby increasing the yield.

To elaborate, the molten salt circulation unit 400 operates the preheating heater 491, and when some of the molten salt in the molten salt tank 410 is melted, it operates the second pump 495. Then, the molten salt boiler 420 is operated to heat the molten salt and then circulated through the molten salt return line 492 to heat the molten salt in the molten salt tank 410. When the molten salt in the molten salt tank 410 is sufficiently heated, the drain valve 494 of the molten salt drain line 493 is closed, and the first pump 490 is operated to supply molten salt to the pyrolysis furnace 200. When stopping the operation of the thermal decomposition reactor, the molten salt boiler 420 is stopped, the first pump 490 and the second pump 495 are stopped, and the drain valve 494 is opened.

The present invention has been described with a focus on preferred embodiments with reference to the accompanying drawings, but it is clear to those skilled in the art that various modifications can be made without departing from the scope of the present invention from this description. Accordingly, the scope of the present invention should be construed by the appended claims to include examples of many such modifications.

100: reactor body 110: inlet
120: outlet 130: circulation passage
200: Pyrolysis furnace 210: Drying stage
220: melting stage 230: decomposition stage
240: Carbonization stage 310: Drive shaft
320: driven shaft 330: driving sprocket
340: driven sprocket 350: chain
360: Transfer member 361: Weight reduction groove
370: Motor 380: Reducer
400: molten salt circulation unit 410: molten salt tank
420: molten salt boiler 430: molten salt supply line
440: molten salt discharge line 450: valve
460: Temperature sensor 470: Control unit
480: ultrasonic flow meter 490: first pump
491: Preheater 492: Molten salt return line
493: molten salt drain line 494: drain valve
495: Second pump 500: Overflow wall
510: through passage

Claims (8)

A reactor body 100 in which an inlet 110 through which polymer waste is introduced is formed on one upper side, and an outlet 120 through which slag composed of ash and undigested carbon is discharged is formed on one lower side;
A pyrolysis furnace 200 of a multi-stage structure disposed horizontally inside the reactor body 100 and thermally decomposing polymer waste while moving in a zigzag shape;
A drive sprocket 330 coupled to the drive shaft 310 installed on one side of the pyrolysis furnace 200;
A driven sprocket 340 coupled to the driven shaft 320 installed on the other side of the pyrolysis furnace 200;
A chain 350 connected between the drive sprocket 330 and the driven sprocket 340 and moved in an endless orbit;
A plurality of transfer members 360 installed on the chain 350 at predetermined intervals to transport polymer waste while moving circularly with the chain 350; and
It includes a molten salt circulation unit 400 connected to the outside of the reactor main body 100 to circulate liquid molten salt, which is a heat transfer medium,
The pyrolysis furnace 200 includes a drying stage 210 located at the top, which removes moisture in the pores of the polymer waste in a temperature range of 80 to 150°C;
A melting stage 220 located below the drying stage 210 and melting and liquefying polymer waste in a temperature range of 100 to 300° C.;
A decomposition stage 230 located below the melting stage 220 and vaporizing and decomposing the polymer waste melt in a temperature range of 200 to 400° C.; and
It is located below the decomposition stage 230 and includes a carbonization stage 240 in which slag composed of ash and undecomposed carbon is generated in a temperature range of 300 to 450 ° C.
The pyrolysis furnace 200 is made of a square duct shape,
The transfer member 360 has a square plate shape,
The chain 350 and the transfer member 360 move while scraping the polymer waste through continuous circulation, drop it to the next stage, and then move again to undergo thermal decomposition.
On the molten salt circulation passage 130 of the reactor main body 100, a plurality of overflow walls 500, which do not overlap each other and are located in parallel, are continuously arranged in a staggered manner with respect to the flow direction of the molten salt,
The overflow wall 500 is disposed inclined at a predetermined angle with respect to the flow direction of the molten salt, and through passages 510 are formed between and at the ends of the overflow walls 500, respectively. Pyrolysis reactor.
delete delete delete In claim 1,
The transfer members 360 are formed in a plate shape and are arranged alternately with one end being close to the inner wall of the pyrolysis furnace 200. A molten salt type multi-stage continuous pyrolysis reactor.
In claim 1,
A molten salt type multi-stage continuous pyrolysis reactor, characterized in that a plurality of weight reduction grooves 361 are formed on both sides and the center of the transfer member 360 to reduce the weight.
In claim 1,
The molten salt circulation unit 400 includes a molten salt tank 410 in which molten salt is stored;
A molten salt boiler 420 connected to the molten salt tank 410 to heat the molten salt;
A molten salt supply line 430 that supplies high-temperature molten salt heated by the molten salt boiler 420 to the molten salt circulation passage 130 of the reactor main body 100;
a molten salt discharge line 440 that discharges low-temperature molten salt from the molten salt circulation passage 130 of the reactor main body 100 to the molten salt tank 410;
A plurality of valves 450 installed on the molten salt supply line 430 to control fluid flow in each line;
Temperature sensors 460 installed in each of the pyrolysis furnaces 200 to detect the temperature of molten salt; and
A control unit 470 that controls the temperature of the pyrolysis furnace 200 by controlling the flow rate of molten salt by the valve 450 through the temperature value measured by the temperature sensor 460. Molten salt type multi-stage continuous pyrolysis reactor.
In claim 1,
The molten salt circulation unit 400 includes a molten salt tank 410 in which molten salt is stored;
A molten salt boiler 420 connected to the molten salt tank 410 to heat the molten salt;
A molten salt supply line 430 that supplies high-temperature molten salt heated by the molten salt boiler 420 to the molten salt circulation passage 130 of the reactor main body 100;
a molten salt discharge line 440 that discharges low-temperature molten salt from the molten salt circulation passage 130 of the reactor main body 100 to the molten salt tank 410;
A plurality of valves 450 installed on the molten salt supply line 430 to control fluid flow in each line;
Temperature sensors 460 installed in each of the pyrolysis furnaces 200 to detect the temperature of molten salt;
a control unit 470 that controls the temperature of the pyrolysis furnace 200 by adjusting the flow rate of molten salt by the valve 450 through the temperature value measured by the temperature sensor 460;
A preheater 491 installed on one side of the molten salt tank 410 to preheat the molten salt;
a molten salt return line 492 that returns molten salt heated by the molten salt boiler 420 to the molten salt tank 410; and
A molten salt drain line 493 connected between the molten salt tank 410 and the molten salt supply line 430 and having a drain valve 494 on one side. Continuous pyrolysis reactor.