TWI826176B - The thermal oxidation apparatus and method for volatile organic compounds - Google Patents

Abstract

A volatile organic compound thermal oxidation equipment comprising a porous medium combustion chamber, an igniter, a heat exchanger and a blower wherein the porous medium combustion chamber comprising a housing, a small-pore heat storage ceramic and a large-pore heat storage ceramic, the igniter comprising a nozzle, an ignition operation unit and a fuel tank, the heat exchanger comprising a gas treatment inlet, a gas treatment outlet, a cooling gas inlet, and a cooling gas outlet, the blower comprising a blast inlet and a blast outlet. The heat storage ceramic of porous media combustion chamber is heated by the igniter, and the airflow with the volatile organic compounds is driven to the porous media combustion chamber to be oxidized by the blower, after the volatile organic compounds is completely oxidized to clean gas, which is cooled by a heat exchanger and then discharged.

Description

Equipment and methods for high-temperature oxidation of volatile organic compounds

The present invention relates to an oxidation equipment, and in particular to a high-temperature oxidation equipment for volatile organic compounds.

Most volatile organic compounds are highly toxic, carcinogenic and harmful, posing serious threats to the ecological environment and human health.

The treatment of volatile organic compounds is considered an important issue in both the chemical materials manufacturing industry and the electronic product manufacturing industry. Generally speaking, equipment to control process exhaust emissions and volatile organic compound oxidation treatment equipment will be installed to discharge them into the environment. The amount of volatile organic compounds is reduced to a minimum.

However, conventional volatile organic compound oxidation treatment equipment usually requires a plurality of furnaces to operate in turn, which consumes a large amount of fuel to provide the temperature required for high-temperature oxidation. At the same time, the requirements for space and control procedures are also high.

In view of the above problems, the inventor of the present case intends to simplify the structure of the oxidation equipment and reduce energy consumption by using a single-furnace regenerative combustion device with a simple structure.

In order to achieve the above object, the present invention provides a high-temperature oxidation equipment for volatile organic compounds, which is used for high-temperature oxidation treatment of air containing volatile organic compounds, including: a porous medium combustion chamber, including a shell and a pore heat storage Ceramics and a coarse-pore heat storage ceramic, the shell has a flow path space inside, and an air flow path containing volatile organic compounds is from the first side of the flow path space to the second side of the flow path space, and the fine The pore heat storage ceramics and the coarse pore heat storage ceramics are arranged in sequence in the flow path direction of the air flow path containing volatile organic compounds. There is an ignition space between the fine pore heat storage ceramics and the coarse pore heat storage ceramics. The flow path space The first side is connected to an air inlet pipe for the air containing volatile organic compounds to flow into the flow path space, and the second side of the flow path space is connected to the first end of an exhaust pipe, an igniter, and includes an A nozzle, an ignition operating unit and a fuel tank. The nozzle is arranged in the ignition space. The ignition operating unit is arranged between the nozzle and the fuel tank and is used to supply fuel in the fuel tank to the nozzle so that the nozzle The combustion gas is ejected to heat the fine-pore heat storage ceramics and the coarse-pore heat storage ceramics, thereby causing the volatile organic gas flowing in from the air intake pipe to flow through the heated fine-pore heat storage ceramics and the coarse-pore heat storage ceramics. A high-temperature clean gas is formed and flows out through the exhaust pipe. A heat exchanger has a processing gas inlet end, a processing gas outlet end, a cooling air inlet end and a cooling air outlet end. The processing gas inlet end is connected At the second end of the exhaust pipe, the cooling air inlet end is connected to an ambient cold air, and the ambient cold air passes through the heat exchanger to cool the high-temperature clean gas flowing through the heat exchanger into a Cooling clean gas, the ambient cold air is discharged from the cooling air outlet after heat exchange, the high-temperature clean gas is discharged from the treatment gas outlet after heat exchange, and a blower having a blowing inlet and a blowing outlet , the blast inlet is connected to the processing gas outlet end, so that the cooled clean gas that has been heat exchanged by the heat exchanger is discharged from the blast outlet.

In one embodiment of the present invention, a high-temperature oxidation device for air containing volatile organic compounds is provided, which further includes a refractory layer disposed on the inner surface of the casing.

In one embodiment of the present invention, a high-temperature oxidation equipment for volatile organic compounds is provided, which further includes an insulation layer disposed on the outer surface of the housing.

In one embodiment of the present invention, a high-temperature oxidation equipment for volatile organic compounds is provided, wherein the ignition controller includes a fuel control valve disposed between the nozzle and the fuel tank to control the flow of ignition fuel.

In one embodiment of the present invention, a high-temperature oxidation equipment for volatile organic compounds is provided, wherein the ignition controller includes a control element and a temperature sensing element, the control element is connected to the temperature sensing element, and the temperature sensing element is configured in the interior of the housing to obtain the temperature in the flow path space

In one embodiment of the present invention, a high-temperature oxidation equipment for volatile organic compounds is provided, wherein the control element is connected to the fuel control valve and the ignition operating unit to control the ignition operation of the igniter and the fuel supply to the igniter. supply.

In one embodiment of the present invention, a high-temperature oxidation device for volatile organic compounds is provided, in which the fine-pore heat-storage ceramics and the coarse-pore heat-storage ceramics can be spherical ceramics, foam ceramics or honeycomb ceramics.

In one embodiment of the present invention, a high-temperature oxidation device for volatile organic compounds is provided, wherein the fuel can be a gaseous fuel.

In one embodiment of the present invention, a method for high-temperature oxidation of volatile organic compounds is provided, which uses the high-temperature oxidation equipment of volatile organic compounds as mentioned above, including: a starting ignition step, turning on the blower, and waiting for the fuel in the fuel tank to Entering the nozzle and mixing with air, the ignition operating unit is started to ignite the fuel, and the combustion gas is injected into the porous medium combustion chamber through the nozzle and the flame area is concentrated on the coarse-pore thermal storage ceramic to heat the coarse-pore thermal storage ceramic to specified operating temperature, a concentrated In the self-ignition step of volatile organic compounds, when the coarse-pore heat storage ceramic reaches the specified operating temperature, the fuel supply is stopped, and the concentrated volatile organic compounds enter the porous media combustion chamber and contact the high-temperature coarse-pore heat storage ceramic to produce a self-ignition reaction. , completely oxidizing volatile organic compounds, when the temperature of the coarse-pore heat storage ceramic is lower than the operating temperature, the fuel supply is restored again, and a stable operation step, when the heat capacity of the coarse-pore heat storage ceramic is large, the porous medium combustion chamber The heat loss is small, so that the supply of concentrated volatile organic compounds can maintain the temperature of the coarse-pore heat storage ceramics and use the heat exchanger to heat the cold air while stopping the supply of fuel. .

According to the high-temperature oxidation equipment of volatile organic compounds of the present invention, the oxidation of volatile organic compounds can be performed with a single-tank regenerative combustion furnace structure to reduce the heat energy dissipated by the movement of volatile organic gases in multiple tanks as in the conventional technology. In addition, the heating position is concentrated in a single position, so that the energy efficiency is high, and the space required for installation is smaller than that of conventional equipment.

100, 101, 102, 103, 104: High temperature oxidation equipment for volatile organic compounds

1: Porous media combustion chamber

11: Shell

11a: Fireproof layer

11b: Insulation layer

12: Fine pore heat storage ceramics

13: Coarse pore heat storage ceramics

14:Intake pipe

15:Exhaust pipe

16: The first side of the flow path space

17: Ignition space

18: The second side of the flow path space

2: Igniter

21:Nozzle

22: Ignition operating unit

23:Fuel tank

24:Fuel control valve

25:Control components

251: Temperature sensing element

3:Heat exchanger

31: Process gas inlet end

32: Process gas outlet end

33: Cooling air inlet end

34: Cooling air outlet end

4: Blower

41:Blast entrance

42: Blower outlet

Figure 1 is a schematic diagram showing an embodiment of a high-temperature oxidation equipment for volatile organic compounds according to the present invention.

Figure 2 is a schematic diagram showing another embodiment of the high-temperature oxidation equipment of volatile organic compounds according to the present invention.

Figure 3 is a schematic diagram showing another embodiment of the high-temperature oxidation equipment for volatile organic compounds according to the present invention.

Figure 4 is a schematic diagram showing another embodiment of the high-temperature oxidation equipment of volatile organic compounds according to the present invention.

Figure 5 is a schematic diagram showing another embodiment of the high-temperature oxidation equipment for volatile organic compounds according to the present invention.

Figure 6 is a schematic diagram showing another embodiment of the high-temperature oxidation equipment for volatile organic compounds according to the present invention.

Figure 7 is a schematic diagram showing another embodiment of the high-temperature oxidation equipment of volatile organic compounds according to the present invention.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 7 . This description is not intended to limit the implementation of the present invention, but is one example of the present invention.

As shown in Figure 1, the high-temperature oxidation equipment 100 of volatile organic compounds is used to oxidize a volatile organic compound, and includes: a porous medium combustion chamber 1, including a shell 11, a fine-pore heat storage ceramic 12 and A coarse-pore heat storage ceramic 13 has a flow path space inside the shell 11, and from the first side 16 of the flow path space to the second side 18 of the flow path space is an air flow path containing volatile organic compounds, The fine-pore heat storage ceramic 12 and the coarse-pore heat storage ceramic 13 are sequentially arranged in the flow path direction of the air flow channel containing volatile organic compounds. There is an ignition point between the fine-pore heat storage ceramic 12 and the coarse-pore heat storage ceramic 13. Space 17, the first side of the flow path space is connected to an air inlet pipe 14 for the volatile organic gas to flow into the flow path space, and the second side of the flow path space is connected to the first end of an exhaust pipe 15 , the igniter 2 includes a nozzle 21, an ignition operating unit 22 and a fuel tank 23. The nozzle 21 is arranged in the ignition space, and the ignition operating unit 22 is arranged between the nozzle 21 and the fuel tank 23. The gaseous fuel in the fuel tank 23 is supplied to the nozzle 21, and the nozzle 21 is ignited to eject a mixture of gaseous fuel and air to heat the coarse-pore heat storage ceramic 13, thereby causing the gas flowing in from the air intake pipe 14 to The volatile organic gas flows through the heated fine-pore regenerative ceramics 12 and the coarse-pore regenerative ceramics 13 to form a high-temperature clean gas that flows out through the exhaust pipeline 15. A heat exchanger 3 has a processing gas inlet end. 31. One treatment gas outlet end 32. A cooling air inlet port 33 and a cooling air outlet port 34. The processing gas inlet port 31 is connected to the second end of the exhaust pipe 15. The cooling air inlet port 33 is connected to an ambient cold air. The environment The cold air cools the high-temperature clean gas flowing through the heat exchanger 3 into a cooling clean gas by passing through the heat exchanger 3. The ambient cold air is heated up by heat exchange and discharged from the cooling air outlet end 34. The high-temperature clean gas is discharged from the processing gas outlet end 32 after heat exchange, and a blower 4 has a blowing inlet 41 and a blowing outlet 42. The blowing inlet 41 is connected to the processing gas outlet end 32 to blow The cooled clean gas that has been heat exchanged through the heat exchanger 3 is discharged from the blast outlet 42 .

With such a structure, the igniter 2 heats the coarse-pore regenerative ceramic 13 to a specified temperature, and at the same time the blower 4 provides air flow driving pressure to drive the gas flow in the high-temperature oxidation equipment 100 of volatile organic compounds, thereby containing volatile compounds. When the air containing organic compounds enters the flow path space from the air inlet pipe 14 and contacts the coarse-pore heat storage ceramics 13, a self-ignition reaction occurs, so that the volatile compounds in it are oxidized and removed, forming a high-temperature clean that does not contain volatile organic compounds. The gas flows out from the exhaust pipe 15, and the fine-pore heat storage ceramics 12 can prevent the gas containing volatile organic compounds in the first side and the intake pipe 14 from burning.

The high-temperature clean gas flowing out from the exhaust pipe 15 then enters the heat exchanger 3 from the process gas inlet end 31. Through the heat exchanger 3, the high-temperature clean gas exchanges heat with the cold air flowing in through the cooling air inlet end 33. The clean gas cools down to become cooled clean gas, flows out from the processing gas outlet end 32 , and is discharged through the blower 4 .

The air that has taken away heat after heat exchange can be further utilized by the volatile organic compound high-temperature oxidation equipment 100. For example, the volatile organic compounds before entering the volatile organic compound high-temperature oxidation equipment 100 are pre-heated and the heat storage is recovered and reused. Achieve the effect of reducing fuel consumption.

As shown in Figure 2, in one embodiment of the present invention, a high-temperature oxidation equipment 101 for volatile organic compounds is provided, in which the porous medium combustion chamber 1 further includes a refractory layer 11a, which is disposed inside the housing 11 surface.

As shown in Figure 3, in one embodiment of the present invention, a high-temperature oxidation equipment 102 for volatile organic compounds is provided, in which the porous medium combustion chamber 1 further includes an insulation layer 11b, which is disposed outside the shell 11. surface.

Through the above structure, the durability of the high-temperature oxidation equipment of volatile organic compounds can be improved, and the ability to block temperature conduction can be improved, preventing the loss of heat energy from the flow path space and further improving the effect of reducing fuel consumption.

As shown in Figure 4, in one embodiment of the present invention, a high-temperature oxidation equipment 103 for volatile organic compounds is provided, in which the ignition controller 2 includes a fuel control valve 24, which is disposed between the nozzle 21 and the fuel tank. 23 to control the flow of ignition fuel.

With the above structure, the combustion of the ignition controller 2 in the nozzle 21 can be indirectly controlled by controlling the supply of ignition fuel. By thus determining whether to heat the flow path space, the temperature in the flow path space can be controlled to avoid unlimited continuation. Heating causes device damage and can improve fuel efficiency, further enhancing the effect of reducing fuel consumption.

As shown in Figure 5, in one embodiment of the present invention, a high-temperature oxidation device 104 for volatile organic compounds is provided, in which the ignition controller includes a control element 25 and a temperature sensing element 251. The control element 25 is connected to The temperature sensing element 251 is disposed inside the housing 11 to obtain the temperature in the flow path space.

With the above structure, the temperature in the flow path space can be obtained through the temperature sensing element 251, and by comparing it with the temperature required to oxidize the volatile organic compound, the time point for controlling ignition and stopping combustion can be known.

As shown in Figure 5, in one embodiment of the present invention, a high-temperature oxidation device 104 for volatile organic compounds is provided, in which the control element 25 is connected to the fuel control valve 24 and the nozzle 21 to control the igniter 2 ignition operation and fuel supply to the igniter 2.

With the above structure, the temperature in the flow path space can be obtained through the temperature sensing element 251 and at the same time, the ignition operation of the igniter 2 and the fuel supply to the igniter 2 can be automatically controlled through the control element 25 to achieve precise temperature control. The effect within the specified range further enhances the effect of reducing fuel consumption.

As shown in Figure 6, the high-temperature oxidation equipment of volatile organic compounds of the present invention can also be combined with the conventional double adsorption concentration tank system to further improve the treatment efficiency. When the first adsorption concentration tank structure connected by a solid line in Figure 6 performs an adsorption process on air containing volatile organic compounds, the ambient cold air is heated into hot air and then enters the second adsorption concentration tank connected by a dotted line in the figure. The structure undergoes a desorption process and becomes concentrated volatile organic compounds, and then enters the porous medium combustion chamber 1, contacts the high-temperature coarse-pore heat storage ceramics 13, and undergoes a self-ignition reaction.

In one embodiment of the present invention, a high-temperature oxidation device for volatile organic compounds is provided, in which the fine-pore heat-storage ceramics and the coarse-pore heat-storage ceramics can be spherical ceramics, foam ceramics or honeycomb ceramics.

Through the above characteristics, ceramic components with holes of different pore sizes and structures can be selected for processing according to the characteristics of different volatile organic compounds to facilitate the oxidation process. The coarse-pore heat storage ceramics store thermal energy and reduce the content of volatile organic compounds in the exhaust gas. To a minimum, fine-pore heat storage ceramics can resist Prevents backfire and prevents the combustion of air containing volatile organic compounds in the first side and the air intake duct to avoid danger.

In one embodiment of the present invention, a high-temperature oxidation device for air containing volatile organic compounds is provided, wherein the fuel can be a gaseous fuel.

Through the above characteristics, the gaseous fuel can be quickly and fully mixed with the air containing volatile organic compounds, so as to further achieve the effect of reducing fuel consumption.

As shown in Figure 7, the high-temperature oxidation equipment of volatile organic compounds of the present invention can also be combined with the conventional double adsorption concentration tank system to further improve the treatment efficiency. When the second adsorption concentration tank structure connected by the solid line in Figure 7 performs the adsorption process, the ambient cold air is heated into hot air and then enters the first adsorption concentration tank structure connected by the dotted line in the figure to perform the desorption process, and It becomes concentrated volatile organic compounds, and then enters the porous medium combustion chamber 1, contacts the high-temperature coarse-pore heat storage ceramics 13, and undergoes a self-ignition reaction.

In one embodiment of the present invention, a method for high-temperature oxidation of volatile organic compounds is provided, which uses the high-temperature oxidation equipment of volatile organic compounds as described in claim 6, including: an ignition step, turning on the blower, and waiting for the fuel The fuel in the tank enters the nozzle and mixes with the air. The ignition operating unit is started to ignite the fuel. The combustion gas is injected into the porous medium combustion chamber through the nozzle and the flame area is concentrated on the coarse-pore regenerative ceramic for heating. When the coarse-pore heat-storage ceramics reaches the specified working temperature, a step of spontaneous combustion of concentrated volatile organic compounds is performed. When the coarse-pore heat-storage ceramics reaches the specified working temperature, the fuel supply is stopped, and the concentrated volatile organic compounds are allowed to enter the porous medium combustion chamber and Contact with the high-temperature coarse-pore heat-storage ceramics to produce a self-ignition reaction, completely oxidizing volatile organic compounds. When the temperature of the coarse-pore heat-storage ceramics is lower than the operating temperature, the fuel supply is restored again, and a stable operation step is performed. The heat capacity of coarse-pore heat storage ceramics is large, and the heat loss of the porous medium combustion chamber is small, making the rich The supply amount of the volatile organic compounds is reduced, so that the heat of the concentrated volatile organic gas can maintain the temperature of the macroporous heat storage ceramic, and is used to heat the cold air through the heat exchanger, while stopping the supply of fuel.

With the above characteristics, high-temperature oxidation of volatile organic compounds can be carried out in a highly efficient manner.

To sum up, according to the high-temperature oxidation equipment of volatile organic compounds of the present invention, the oxidation of volatile organic compounds can be carried out with a single-tank regenerative combustion furnace structure, thereby reducing the need for controlling volatile organic gases in multiple furnaces as in the conventional technology. It reduces the complexity of the volatile organic compound oxidation treatment equipment by concentrating the heating positions in a single location, making it highly energy efficient and requiring less space than conventional equipment.

The above descriptions and explanations are only descriptions of the preferred embodiments of the present invention. Those with ordinary knowledge of this technology may make other modifications based on the patent scope defined below and the above explanations, but these modifications should still be made. It is for the spirit of the present invention and within the scope of rights of the present invention.

104: High temperature oxidation equipment for volatile organic compounds

1: Porous media combustion chamber

11: Shell

11a: Fire resistant layer

11b: Insulation layer

12: Fine pore heat storage ceramics

13: Coarse pore heat storage ceramics

14:Intake pipe

15:Exhaust pipe

2: Igniter

21:Nozzle

22: Ignition operating unit

23:Fuel tank

24:Fuel control valve

25:Control components

251: Temperature sensing element

3:Heat exchanger

31: Process gas inlet end

32: Process gas outlet end

33: Cooling air inlet end

34: Cooling air outlet end

4: Blower

41:Blast entrance

42:blast outlet

Claims (10)

A high-temperature oxidation equipment for volatile organic compounds, used for oxidation treatment of volatile organic compounds, including: a porous medium combustion chamber, including a shell, a fine-pore heat storage ceramic and a coarse-pore heat storage ceramic. There is a flow path space inside, and there is a volatile organic gas flow path from the first side of the flow path space to the second side of the flow path space. The fine pore heat storage ceramics and the coarse pore heat storage ceramics are sequentially arranged in the volatile organic gas flow path. The direction of the flow path of the volatile organic gas flow path is that there is an ignition space between the fine pore heat storage ceramics and the coarse pore heat storage ceramics, and the first side of the flow path space is connected to an air inlet pipeline for the inflow of the volatile organic gas. The flow path space, the second side of the flow path space is connected to the first end of an exhaust pipe; the igniter includes a nozzle, an ignition operating unit and a fuel tank, the nozzle is arranged in the ignition space, and the ignition The operating unit is disposed between the nozzle and the fuel tank, and is used to supply gaseous fuel in the fuel tank to the nozzle, and ignite the nozzle to eject a mixture of gaseous fuel and air to heat the coarse-pore regenerative ceramics, thereby The volatile organic gas flowing in from the air inlet pipe flows through the heated fine-pore heat storage ceramics and the coarse-pore heat storage ceramics to form a high-temperature clean gas that flows out through the exhaust pipe; a heat exchanger, It has a processing gas inlet end, a processing gas outlet end, a cooling air inlet end and a cooling air outlet end. The processing gas inlet end is connected to the second end of the exhaust pipe, and the cooling air inlet end is connected to a The ambient cold air cools the high-temperature clean gas flowing through the heat exchanger into a cooled clean gas by passing through the heat exchanger. After the ambient cold air is heated by heat exchange, it flows from the cooling air outlet end. Discharge, the high-temperature clean gas is discharged from the outlet end of the process gas after heat exchange; and A blower has a blowing inlet and a blowing outlet. The blowing inlet is connected to the processing gas outlet end so as to discharge the cooled clean gas heat-exchanged by the heat exchanger from the blowing outlet. The high-temperature oxidation equipment for volatile organic compounds as described in claim 1, wherein the porous medium combustion chamber further includes a refractory layer disposed on the inner surface of the housing. The high-temperature oxidation equipment for volatile organic compounds as described in claim 1, wherein the porous medium combustion chamber further includes an insulation layer disposed on the outer surface of the shell. The high-temperature oxidation equipment for volatile organic compounds as claimed in claim 1, wherein the igniter includes a fuel control valve disposed between the nozzle and the fuel tank to control the flow of ignition fuel. The high-temperature oxidation equipment for volatile organic compounds as described in claim 1, wherein the igniter includes a control element and a temperature sensing element, the control element is connected to the temperature sensing element, and the temperature sensing element is disposed on the housing inside to derive the temperature in the flow path space. The high-temperature oxidation equipment for volatile organic compounds as claimed in claim 5, wherein the control element is connected to a fuel control valve and the ignition operating unit to control the ignition operation of the igniter and the fuel supply to the igniter. The high-temperature oxidation equipment for volatile organic compounds as described in claim 1, wherein the fine-pore heat storage ceramics and the coarse-pore fine-pore heat storage ceramics can be spherical ceramics, foam ceramics or honeycomb ceramics. The high-temperature oxidation equipment for volatile organic compounds as described in claim 1, wherein the fuel can be a gaseous fuel. The high-temperature oxidation equipment for volatile organic compounds as described in claim 1, wherein the high-temperature oxidation equipment for volatile organic compounds is combined with a double-adsorption concentration tank system or a runner system to burn and remove The air containing volatile organic compounds is then concentrated to heat the ambient cold air and then desorb the adsorption concentration tank or wheel. A method for high-temperature oxidation of volatile organic compounds, which uses the high-temperature oxidation equipment of volatile organic compounds as described in claim 6, including: a starting ignition step, turning on the blower, waiting for the fuel in the fuel tank to enter the nozzle and mix with the air Mix, start the ignition operating unit to ignite the mixture of fuel and air, introduce the combustion gas into the porous medium combustion chamber through the blower pressure and concentrate the flame area on the coarse-pore regenerative ceramic to heat the coarse-pore regenerative ceramic to Specified working temperature; a step of self-ignition of concentrated volatile organic compounds. When the coarse-pore heat storage ceramic reaches the specified working temperature, the fuel supply is stopped, and the concentrated volatile organic compounds are allowed to enter the porous medium combustion chamber and interact with the high-temperature coarse-pored ceramics. The heat storage ceramics come into contact to produce a self-ignition reaction to completely oxidize the volatile organic compounds. When the temperature of the coarse pore heat storage ceramics is lower than the operating temperature, the fuel supply is restored again; and a stable operation step, when the heat capacity of the coarse pore heat storage ceramics is Large, the heat loss of the porous medium combustion chamber is small, so that the supply amount of concentrated volatile organic compounds can maintain the temperature of the coarse-porous heat storage ceramics and be used for heating by the heat exchanger. cold air, and the fuel supply is stopped at the same time.

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