KR20220147172A - A pyrolysis petrolizing system capable of purifying exhaust gas - Google Patents

Abstract

The present invention provides a system for emulsifying a waste synthetic resin having excellent ability of purifying exhaust gas such as sulfur dioxide and chlorine gas generated during emulsification of the waste synthetic resin. The present invention includes a pyrolysis furnace (100), a condenser (200) for condensing oil vapor flowing out of the pyrolysis furnace (100) to generate pyrolysis oil, and a first purifier (300) for purifying exhaust gas.

Description

A waste synthetic resin emulsification system capable of purifying exhaust gas

The present invention relates to a waste synthetic resin emulsification system for pyrolyzing waste synthetic resins such as waste plastics and waste vinyl to produce pyrolyzed oil. It relates to a waste synthetic resin emulsification system that not only purifies residual gas discharged after being heat-exchanged in oil vapor and produced as pyrolysis oil, but also purifying exhaust gas that facilitates the treatment of ash inside the pyrolysis furnace.

There are two types of emulsifying devices: a batch type in which waste is heated and melted from the outside in a state in which it is put into a pyrolysis furnace, and a continuous type in which waste is continuously put into the pyrolysis furnace and heated from the outside.

The emulsification system of the prior art was equipped with a condenser for cooling and liquefying the oil vapor generated in the rotary pyrolysis furnace for heating and rotating the waste. The condenser is manufactured in an approximately cylindrical shape. The pyrolysis oil generated in the heat exchange process is stored in a separate storage tank.

Sulfur dioxide and chlorine gas generated during the heat exchange process must be purified and discharged because it can cause environmental problems and can have harmful effects on the human body when discharged into the atmosphere without permission.

Registered Patent No. 10-2071339 (Registered as 2020122; Waste Energy Solution Co., Ltd.; Continuous pyrolysis emulsification device for stable discharge of gas and sludge)

An object of the present invention is to provide a waste synthetic resin emulsification system having excellent purification ability of exhaust gases such as sulfur dioxide and chlorine gas generated during emulsification of waste synthetic resin.

The present invention provides a firebox 110 having an exhaust gas outlet 112 through which gas generated with combustion of the burner 111 is discharged; and a pyrolysis furnace 100 including a drum 120 in which oil vapor is generated by heating the inputted waste synthetic resin by the heat generated by the burner 111; a condenser 200 that heat-exchanges with the internally circulated cooling water to condense the oil vapor flowing out of the pyrolysis furnace 100 to generate pyrolysis oil and discharge the remaining oil vapor; and sodium hydroxide (NaOH) as a crystalline solid; and a first purifying device 300 including a; and a plurality of perforated plates 310 for loading the sodium hydroxide and allowing the exhaust gas to pass between the sodium hydroxide.

The present invention is zinc (Zn); and a temperature control device 410 for controlling the internal temperature, wherein the exhaust gas passing through the first purification device 300 flows between the zinc and the second purification device 400 is discharged; may include.

The second purifier 400 of the present invention may further include a water vapor supply unit 420 for supplying water vapor into the second purifier 400 .

The present invention may further include an activated carbon dust collector 500 disposed at the rear end of the second purification device 400 and configured to collect dust contained in the exhaust gas that has passed through the second purification device.

The present invention may further include a bag filter dust collector 600 disposed at the rear end of the second purifying device 400 and configured to collect dust of the exhaust gas that has passed through the second purifying device.

The present invention further includes a cyclone dust collector 700 through which carbonized ash is sucked into the drum 120 for purification, and the gas passing through the cyclone dust collector 700 may be introduced into the bag filter dust collector.

By the waste synthetic resin emulsification system capable of purifying exhaust gas according to the present invention, it is possible to provide an excellent waste synthetic resin emulsification system not only in desulfurization and desalination, but also in air purification by reducing discharged dust.

1 is a schematic diagram of a waste synthetic resin emulsification system capable of exhaust gas purification according to the present invention;
Figure 2 is a flow chart of air purification in the waste synthetic resin emulsification system capable of exhaust gas purification according to the present invention;
3 is a conceptual diagram illustrating a first purifying device in the present invention;
4 is a conceptual diagram illustrating a second purifying device in the present invention;
5 is a conceptual view showing an activated carbon dust collector in the present invention;
6 is a conceptual diagram illustrating a bag filter dust collector in the present invention;
7 is a conceptual diagram illustrating a bag filter dust collector in the present invention;

It will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram of a waste synthetic resin emulsification system capable of exhaust gas purification according to the present invention. With reference to this, the pyrolysis oil production process will be described. The waste synthetic resin is put into the pyrolysis furnace 100 . The waste synthetic resin injected into the drum 120 is heated by the heating of the burner 1110 in the firebox 110 . During initial heating, water vapor is generated. The generated steam is supplied to the steam flow line in the firebox 110, heated by the burner 111, and then purified and discharged. Close the valves (V2, V3) to facilitate the discharge of water vapor. When the water vapor discharge is complete, close the valve (V1). oil vapor is generated. The generated oil vapor flows toward the condenser 200 . The cooling water stored in the cooling water storage tank CS1 flows inside the condenser 200 . Inside the condenser 200, high-temperature oil vapor and low-temperature cooling water exchange heat with each other. Oil vapor becomes pyrolysis oil by heat exchange. The generated pyrolysis oil flows from the condenser 200 to the pyrolysis oil storage tank OS along the oil line OL1. The pyrolysis oil generated in the lower part of the condenser 200 and not exhausted flows through the oil line OL2 to the pyrolysis oil storage tank OS. The remaining oil vapor that has not been condensed flows to the cooling tower (CT) side. The cooling water of the cooling water storage tank CS1 flows inside the cooling tower CT. Even inside the cooling tower (CT), residual oil vapor and cooling water are exchanged heat. Thermal cracking oil is produced by heat exchange. The generated pyrolysis oil is directed to the pyrolysis oil storage tank (OS). The oil vapor that is not condensed inside the cooling tower (CT) is directed toward the service tank (ST). Oil vapor is supplied to the bottom side of the service tank (ST). As saturated inside the service tank (ST), oil vapor may be generated as pyrolysis oil. The generated pyrolysis oil flows to the pyrolysis oil storage tank (OS). A vacuum pump (VP) is disposed at the rear end to suck the oil vapor of the service tank (ST). By the operation of the vacuum pump (VP), the oil vapor flows in the order of the pyrolysis furnace 100, the condenser 200, the cooling tower (CT), and the service tank (ST) and heat exchanges to generate pyrolysis oil. The residual oil vapor flows into the vacuum water storage tank (WS) and then is supplied to the burner side. The residual oil vapor may be supplied to the burner 111 and used as a main heat source. A refrigerant storage tank CS2 is provided on one side of the vacuum water storage tank WS, and an internal refrigerant (which may be R-22) flows inside the vacuum water storage tank WS. The internal vacuum water and the refrigerant (R-22) exchange heat with each other, so that the vacuum water can be maintained at a predetermined temperature (preferably 30 degrees C or less) or less. This is to improve the durability of the vacuum pump (VP). Preferably, a water-sealed vacuum pump may be used. When the main valve (MV) is closed to discharge the residual pyrolysis oil inside the condenser 200 and the vacuum pump (VP) is operated with the bypass valve (BV) opened, the pyrolysis oil storage tank along the oil line (OL2) (OS) flows into The residual oil vapor rides the bypass pipe (BP) and flows into the vacuum water storage tank (WS) along the bypass valve (BV).

The residual gas passing through the vacuum water storage tank WS is supplied to the burner 111 and used as a main heat source. Since the residual gas may include ethane, butane, propane, and the like, it is suitable to be used as a main heat source.

The residual gas burned by the burner 111 flows inside the firebox 110 and then flows into a purification system to be described later. The residual gas includes sulfur dioxide (SO2), chlorine gas (Cl2) and carbon dioxide (CO2).

Sulfur dioxide is an inorganic compound with the chemical formula SO2. Also called sulfurous acid gas, sulfurous anhydride. Two oxygen atoms and one sulfur atom are bonded. It is a colorless, toxic gas with a pungent odor. Occurs naturally when organic matter decomposes. If the sulfur dioxide level is higher than the standard, it can cause eye irritation or respiratory problems. It can also cause allergies and, in severe cases, even death.

Chlorine is a chemical element belonging to halogen. Chlorine is a yellow-green gas that exists as a diatomic molecule in the standard state, has an unpleasant odour, and is 2.5 times heavier than air. It has the highest electron affinity among elements and the fourth highest electronegativity. It is also the second most abundant halogen element. Chlorine gas is very toxic and dangerous to living things. It reacts with hydrogen in the presence of ultraviolet light to produce hydrogen chloride.

A configuration for purifying residual gas discharged from the firebox 110 will be described with reference to FIGS. 1 and 2 .

Referring to FIGS. 2 and 3 , in the first purification device 300 , sodium hydroxide (solid state) grains are placed on a plate 310 provided with a number of holes 311 . As shown, the plates 310 are spaced apart so that a plurality of layers can be formed. A partition wall 320 is disposed in the middle of the first purifying device 300 . This is to increase the reaction time by increasing the residence time of the gas flowing inside.

2 and 4 , the gas that has passed through the first purifier 300 flows into the second purifier 400 . A temperature control device 410 for regulating the temperature inside the second purification device 400 from the outside of the second purification device 400 is provided. The temperature controller 410 may be a burner. This is to keep the internal temperature constant at 40 to 60 degrees Celsius. Zinc (Zn) is provided inside. On the other hand, at the inlet side of the second purifying device 400, a water vapor 420 supply unit for supplying water vapor (H 2 O steam) therein is provided. Water vapor and the gas that has passed through the first purifier 300 are mixed together.

2 and 5 , the gas that has passed through the second purification device 400 flows through the activated carbon dust collector 500 . Activated carbon dust collector is a dust collector that removes and collects various harmful gases by passing the activated carbon in the dust collector by using the properties of activated carbon to adsorb and remove various harmful odors, odors and smoke.

2 and 6 , the gas that has passed through the activated carbon dust collector 500 passes through the bag filter dust collector 600 . A bag filter dust collector (filter cloth dust collector) is a device that filters out dust by passing exhaust gas through a bag filter. A filter cloth dust collector is a device that attaches and collects dust by passing a dust stream through a glass or ceramic fiber filter cloth. As shown, a gas inlet is provided at one side of the bag filter, and air is sucked in and discharged by the flow of compressed air into the bag filter 610 . The dust is filtered through the filter and separated and discharged downward. The gas that has passed through the bag filter dust collector 600 is discharged to the outside air.

2 and 7, the ash in the drum 120 inside the pyrolysis furnace 100 is sucked and supplied to a separately provided cyclone dust collector 700, and the dust is separated and discharged. The air that has passed through the cyclone dust collector 700 is supplied to the aforementioned bag filter dust collector 600 to more precisely remove dust.

When air containing ash is introduced from one side of the cyclone dust collector 700, heavy ash falls to the floor by spiral rotation, and the relatively light purified air is separated and discharged upward.

Hereinafter, the chemical reaction mechanism will be described.

The initial exhaust gas includes chlorine (Cl2), sulfur dioxide (SO2), and carbon dioxide (CO2). Sulfur dioxide reacts as shown in the following formula while passing through the first purification device in which sodium hydroxide (NaOH) grains are disposed.

[Formula 1]

Relatively stable carbon dioxide is predicted to be difficult to react. Also, sulfur dioxide will react more easily and faster than chlorine gas (Cl2) due to its instability. In addition, since sodium hydroxide (NaOH) is a solid particle, the reaction of relatively fast and light chlorine gas (Cl2(g)) will be weak.

While passing through the first purifier 300, sulfur dioxide reacts with sodium hydroxide grains, and is changed into sodium sulfite and water. On the other hand, carbon dioxide and chlorine gas are introduced into the second purification device 400 .

Referring to Chemical Formula 2, chlorine gas is dissolved by water vapor supplied together with the second purifier 400 to become hypochlorous acid and hydrogen chloride.

[Formula 2]

As can be seen in Chemical Formula 3 below, the hydrogen chloride gas introduced into the second purifier 400 reacts with zinc to become zinc chloride and hydrogen gas.

[Formula 3]

The gas that has passed through the second purifier is discharged to the outside air when it passes through the activated carbon dust collector 500 and the bag filter dust collector 600 as described above.

100: pyrolysis furnace 200: condenser
300: first purifying device 400: second purifying device
500: activated carbon dust collector 600: bag filter dust collector
700: cyclone dust collector

Claims (6)

a firebox 110 having an exhaust gas outlet 112 through which gas generated with combustion of the burner 111 is discharged; and a pyrolysis furnace 100 including a drum 120 in which oil vapor is generated by heating the inputted waste synthetic resin by the heat generated by the burner 111;
a condenser 200 that heat-exchanges with the internal circulating cooling water to condense the oil vapor flowing out of the pyrolysis furnace 100 to generate pyrolysis oil and discharge the remaining oil vapor; and
sodium hydroxide (NaOH) as a crystalline solid; and a first purifying device 300 including; and a plate 310 perforated for loading the sodium hydroxide and allowing the exhaust gas to pass between the sodium hydroxide. Possible waste synthetic resin emulsification system. The method of claim 1,
zinc (Zn); and a temperature control device 410 for adjusting the internal temperature, wherein the exhaust gas passing through the first purification device 300 flows between the zinc and the second purification device 400 is discharged; A waste synthetic resin emulsification system capable of purifying exhaust gas, characterized in that it comprises a. 3. The method of claim 2,
The second purification device (400) is a waste synthetic resin emulsification system capable of purifying exhaust gas, characterized in that it further comprises a; a steam supply unit (420) for supplying steam into the interior of the second purification device (400). 3. The method of claim 2,
An activated carbon dust collector 500 disposed at the rear end of the second purification device 400 to collect dust contained in the exhaust gas that has passed through the second purification device; Synthetic resin emulsification system. 3. The method of claim 2,
Waste synthetic resin emulsification capable of exhaust gas purification, characterized in that it is disposed at the rear end of the second purification device 400 and further includes a bag filter dust collector 600 for collecting dust of the exhaust gas that has passed through the second purification device system. 6. The method of claim 5,
It further includes a cyclone dust collector 700 for purifying the carbonized ash is sucked in and introduced into the drum 120,
The waste synthetic resin emulsification system capable of purifying exhaust gas, characterized in that the gas that has passed through the cyclone dust collector (700) flows into the bag filter dust collector.

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