JP2001017937A - Recycle device for vinyl chloride - Google Patents

Abstract

PROBLEM TO BE SOLVED: To treat the waste of vinyl chloride for recycling. SOLUTION: A vinyl chloride treating device 1 is provided with a heating device 100 mounted to a frame 20 on a base 10. The heating device 100 has a continuous rotary fluidizing furnace 200, which is heated by an electric heater 130. The vinyl chloride waste charged to a hopper 210 is heated at about 900 deg.C as the max. temp. in an oxygen-free atmosphere while advancing in the continuous rotating fluidizing furnace 200 by a screw, or the like. The waste is decomposed into a solid such as activated carbon and a metallic chloride and a gas by the heating. The solid material is recovered in a tank 300 and the gas is passed through a pipe 400, brought into contact with a water filter in a treating device 500 to recover hydrogen chloride as an aq. solution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for recycling vinyl chloride discharged from households as incombustible waste or industrial waste.

[0002]

2. Description of the Related Art Vinyl chloride is contained in a considerable proportion in non-combustible garbage from homes or construction garbage as industrial waste. When vinyl chloride is subjected to heat treatment or incineration, harmful gases such as hydrogen chloride gas are generated, which is an environmental problem.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an apparatus for regenerating vinyl chloride without pollution and using it as a resource.

[0004]

SUMMARY OF THE INVENTION The recycling apparatus of the present invention for recycling vinyl chloride waste, which contains vinyl chloride alone or metal, or waste mixed with other plastics, is capable of converting the input vinyl chloride waste into an oxygen-free state. Up to about 900
° C., a continuous rotary fluidized furnace heated to ℃, a water supply means disposed at the inlet of the continuous rotary fluidized furnace, a solids recovery tank provided below the discharge port of the continuous rotary fluidized furnace, The apparatus includes a water supply means provided, a generated gas recovery pipe connected to an outlet, and a generated gas treatment device connected to the generated gas recovery pipe. The generated gas processing apparatus separates metal chlorides and hydrogen chloride, converts them into an aqueous solution, and recovers them.

[0005] The electric heater further comprises an electric heater for heating the continuous rotary fluidized-bed furnace, and a heat insulating material covering an outer peripheral portion of the electric heater.

Further, the generated gas processing apparatus includes a first-stage generated gas processing apparatus for processing a generated gas containing water vapor at 100 ° C., and a first-stage generated gas processing apparatus mainly containing metal chloride. The apparatus is provided with a second-stage product gas treatment device for recovering hydrogen chloride as an aqueous solution by introducing exhaust gas, and a filter for washing the produced gas with water.

[0007]

FIG. 1 is an explanatory view showing the overall structure of a vinyl recycling apparatus according to the present invention, and FIG. 2 is a sectional view of a main part. The vinyl recycling apparatus generally denoted by reference numeral 1 has a base 10 and a frame 20 provided on the base 10.

The frame 20 has one end supported by the base 10 by a bearing 30 and the other end supported by the base 10 by a jack 40. By raising and lowering the jack 40, the entire heating device 100 can be tilted.

The heating apparatus 100 has a so-called rotary kiln structure in which a cylindrical continuous rotary fluidizing furnace 200 is rotatably arranged between internal chambers surrounded by a heat insulating wall member 110. The continuous rotary fluidized-bed furnace 200 has a cylindrical shape, and the inlet and outlet of the heat insulating wall member 110 are also sealed by heat insulating walls 102 and 104. The inside of the wall member 110 of the heating device 100 is partitioned into an appropriate number of heating chambers 120. An electric heater 130 is provided in each heating chamber 120. In this embodiment, three heating chambers 120 are shown, and the temperature of each heating chamber 130 is detected by a temperature sensor 132.

[0010] The continuous rotary fluidized-bed furnace 200 includes a suitable bearing 14.
0 and rotatably supported, the motor 150 and the chain 15
It is rotated at an appropriate speed by a drive mechanism such as 2. At the end of the continuous rotary fluidized furnace 200 on the jack device 20 side, a hopper 210 of vinyl chloride to be treated is provided, and vinyl chloride is put into the continuous rotary fluidized furnace 200.

A water supply nozzle 250 is provided near the vinyl chloride inlet of the continuous rotary fluidized-bed furnace 200. At the end of the continuous rotary fluidized-bed furnace 200 opposite to the vinyl chloride inlet, an outlet 220 for the processed material is provided. The outlet 220 is fixed, and is connected to the rotating continuous rotary fluidized-bed furnace 200 by an appropriate joint device 225. The lower end of the outlet 220 is connected to the solids recovery tank 300.
The upper end of the outlet 220 is provided with a water supply nozzle 260 in the outlet 220 connected to the product gas recovery pipe 400, and the product gas recovery pipe 400
The generated gas is sent to a generated gas processing device 500 described later.

The continuous rotary fluidized furnace 200 is controlled to be heated to about 300 ° C. in the first heating chamber R ₁ near the inlet and to about 900 ° C. in the third heating chamber R ₃ . In order to withstand this temperature, the cylindrical continuous rotary fluidized furnace 200 is made of heat-resistant steel and subjected to an appropriate corrosion-resistant treatment. A process in a case where waste such as an electric wire coated with vinyl chloride, for example, is put into the continuous rotary fluidized furnace 200 from the hopper 210 will be described. Processed objects such as electric wires are continuously sent from an inlet to an outlet by a screw conveyor (not shown) provided in the continuous rotary fluidized-bed furnace 200.

Water supplied from a nozzle 250 provided at the inlet of the continuous rotary fluidized furnace 200 is converted to steam when heated to 100 ° C. To progress. Due to the presence of the water vapor, the inside of the furnace is maintained in an oxygen-free state and heated to 900 ° C.

From around 200 ° C., hydrogen chloride gas (HCl)
Separation begins and is completely separated at about 300 ° C. The residue becomes hydrocarbons and metals. In the heating chamber R _2, about 300
Heat from ℃ to 600 ℃. At around 450 ° C., the hydrocarbon becomes liquid and the metal is separated. The separated metal reacts with the hydrogen chloride gas to generate a metal chloride. In this reaction, calcium chloride promotes the reaction as a catalyst.

In the heating chamber R ₃ , about 600 ° C. to 900 ° C.
Heated until. By this heating, most of the liquid hydrocarbons are carbonized. This activated carbon comes in contact with hydrogen chloride gas,
Carbon and hydrogen are separated, and the hydrogen is exhausted as a heating gas. The separated carbon binds to the activated carbon. No dioxin is generated by the above reaction.

The treated material of vinyl chloride is washed with calcium chloride before being charged. If there is no pretreatment, calcium chloride is added to the furnace. The calcium chloride converts lead, copper, and the like, which are materials of the electric wire, into chloride together with the generated hydrogen chloride. The internal atmosphere near the outlet of the continuous rotary fluidized-bed furnace 200 is steam, hydrogen chloride gas, a small amount of combustible gas, activated carbon, solid metals (copper, lead, tin, etc.) and metal chlorides.

The activated carbon and the solid metal fall from the outlet 220 into the solids recovery tank 300 and are collected. A heat exchanger (not shown) is provided in the solid recovery tank 300 to recover the heat of the solid.

The water nozzle 26 provided in the outlet 220
The water supplied from 0 is converted to steam, seals the opening of the outlet, and is sent to the generated gas recovery pipe 400 together with the gas in the outlet 220. Steam, hydrogen chloride, metal chloride, and a small amount of combustible gas product gas are sent to the product gas treatment device 500 via the recovery pipe 400.

In order to improve the processing efficiency, two continuous rotary fluidized furnaces 200 can be provided as shown in FIG.

The product gas processing apparatus 500 has a tank 510, and the tank 510 is supplied through a product gas supply port 520.
The tank 510 into which the generated gas is supplied is provided with a filter 600 described later, which converts hydrogen chloride into water and hydrochloric acid.

At the bottom of the tank 510, a water outlet 53 is provided.
0 and a pump 550 communicating with the outlet 530 is provided above the tank 510 to circulate water through the shower 560. The water injected from the shower 560 passes through the filter 600 and is used for the reaction of the generated gas. A blower and a filter (not shown) are provided in the upper part of the tank 510, and combustible gas and the like in the tank 510 are collected in an appropriate container.

FIG. 3 is a configuration diagram of the generated gas processing apparatus, and FIG. 4 is a component diagram. A flange 512 that supports the filter holding member is provided inside the tank 510 whose upper part is open. The frame body 610 inserted into the tank 510 is a rectangular frame that is open at the top and bottom, and has a vertical picture wall 612 provided inside.

The filter holding member 620 is used to
0 is suspended, and a pool 640 for storing water is formed on the upper part. The water in the pool 640 drops on the filter 630,
The reaction of the product gas sent is promoted. Tank 51
The top of 0 is covered with a lid 650.

FIG. 1 shows only one generated gas processing apparatus 500, but in an actual system,
Two-stage devices are connected in series. In the first stage processing device,
100 ° C. water vapor and product gas are fed in, and a 100 ° C. aqueous solution is recovered. Steam and hydrogen chloride whose temperature has been reduced to about 80 ° C. are sent into the second-stage processing apparatus.

Hydrogen chloride is not water-soluble at 100 ° C., but becomes water-soluble when the temperature is lowered to about 80 ° C., and changes into an aqueous solution. Thus, hydrogen chloride can be recovered as an aqueous solution in the second-stage processing apparatus.

When a processing plant is constructed, this 2
Two rows of product gas units in stages can be provided in parallel, and an aqueous solution or the like in the stopped device can be collected while operating alternately.

[0027]

As described above, according to the present invention, waste such as vinyl chloride alone, general plastic mixed with vinyl chloride or electric wire coated with vinyl chloride is introduced into a continuous rotary fluidized furnace, and the oxygen-free state is obtained. By performing the treatment at a high temperature of about 900 ° C., the solid gas such as activated carbon and metal chloride is separated from the generated gas.

The high-temperature solids are recovered by a heat exchanger, and then the solids themselves are recovered and used as resources for recycling.
The product gas containing hydrogen chloride can be introduced into a processing device having a water filter to recover hydrogen chloride as an aqueous solution. Therefore, vinyl chloride can be recycled without discharging harmful substances to the outside during processing.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an outline of a processing apparatus of the present invention.

FIG. 2 is a sectional view of a main part of FIG. 1;

FIG. 3 is an explanatory view showing the structure of a generated gas processing device.

FIG. 4 is an explanatory diagram showing a member configuration of a generated gas processing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recycling device of vinyl chloride 10 Base 20 Frame 40 Jack 100 Heating device 110 Heat insulation wall member 130 Electric heater 140 Bearing 200 Continuous rotary fluidized furnace 250, 260 Water nozzle 300 Solids recovery tank 400 Generated gas recovery pipe 500 Generated gas treatment device

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[Procedure amendment]

[Submission date] December 22, 1999 (1999.12.
22)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

SUMMARY OF THE INVENTION The recycling apparatus of the present invention for recycling vinyl chloride waste, which contains vinyl chloride alone or metal, or waste mixed with other plastics, is capable of converting the input vinyl chloride waste into an oxygen-free state. , A continuous rotary fluidized furnace heated to 900 ° C. or higher, water supply means disposed at the inlet of the continuous rotary fluidized furnace, and solid matter provided below an outlet of the continuous rotary fluidized furnace. , A water supply means provided at the outlet, a generated gas recovery pipe connected to the outlet, and a generated gas processing device connected to the generated gas recovery pipe. The generated gas processing apparatus separates metal chlorides and hydrogen chloride, converts them into an aqueous solution, and recovers them.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

[0012] Continuous rotating fluidized reactor 200 to about 300 ° C. in the first heating chamber R ₁ of the inlet portion near the third the heating chamber R ₃
The heating is controlled to 900 ° C. or higher . In order to withstand this temperature, the cylindrical continuous rotary fluidized furnace 200 is made of heat-resistant steel and subjected to an appropriate corrosion-resistant treatment. A process in a case where waste such as an electric wire coated with vinyl chloride, for example, is put into the continuous rotary fluidized furnace 200 from the hopper 210 will be described. Processed objects such as electric wires are continuously sent from an inlet to an outlet by a screw conveyor (not shown) provided in the continuous rotary fluidized-bed furnace 200.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

Water supplied from a nozzle 250 provided at the inlet of the continuous rotary fluidized furnace 200 is converted to steam when heated to 100 ° C. To progress. Due to the presence of the water vapor, the inside of the furnace is maintained in an oxygen-free state, and is heated to 900C or more .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

In the heating chamber R ₃ , about 600 ° C. to 900 ° C.
It is heated to above. By this heating, most of the liquid hydrocarbons are carbonized. The activated carbon and the hydrogen chloride gas come into contact, carbon and hydrogen are separated, and the hydrogen is exhausted as a heatable gas. The separated carbon binds to the activated carbon. No dioxin is generated by the above reaction.

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Claims (4)

[Claims] 1. A continuous rotary fluidized-furnace for recycling vinyl chloride waste to which vinyl chloride alone or metal has adhered, wherein the continuous vinyl fluid waste is heated to a maximum of about 900 ° C. in an oxygen-free state. Water supply means disposed at the inlet of the continuous rotary fluidized furnace, a solids recovery tank provided below the discharge port of the continuous rotary fluidized furnace, and water supply means disposed at the discharge port, It has a product gas recovery pipe connected to the discharge port, and a product gas treatment device connected to the product gas collection pipe. The product gas treatment device separates metal chlorides and hydrogen chloride, converts them into an aqueous solution, and recovers them. Vinyl recycling equipment. 2. An electric heater for heating a continuous rotary fluidized furnace, and a heat insulating material covering an outer peripheral portion of the electric heater.
The described PVC recycling equipment. 3. A product gas processing apparatus mainly comprising a first-stage metal chloride for processing a product gas containing water vapor at 100 ° C., and a first-stage product gas processing apparatus. 2. The vinyl chloride recycling apparatus according to claim 1, further comprising a second-stage generated gas treatment apparatus that receives the exhaust gas and recovers hydrogen chloride as an aqueous solution. 4. The apparatus for recycling vinyl chloride according to claim 1, wherein the generated gas processing apparatus includes a filter for washing the generated gas with water.