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Bio-safety disposal method for dispelling dichlorodifluoromethane by induction heating and pyrolysis induction heating furnace

An induction heating furnace and induction heating technology, applied in lighting and heating equipment, furnaces, crucible furnaces, etc., can solve problems such as difficulty in popularization and application, hidden safety hazards, and increased processing costs, and achieve convenient start-up operation and high energy utilization. , the effect of fast heating speed

Active Publication Date: 2012-05-23
TIANJIN HEJIA VEOLIA ENVIRONMENTAL SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are various problems. For pyrolysis by combustion method, there are potential safety hazards due to the flammable gas in the mixed gas. At the same time, it increases the treatment cost and easily forms secondary pollutants.
Published patent CN1049295A has described a kind of method that freon is catalytically decomposed, uses the catalyst that comprises alumina or alumina-silicon dioxide composite oxide in this method, and decomposes freon under the condition that water vapor exists, but this The problem with this method is that the hydrogen fluoride produced by the decomposition of freon has a strong fluorination effect on alumina, which leads to the deactivation of the catalyst in a short time
Other methods are difficult to popularize and apply due to the limitation of equipment technology and cost

Method used

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  • Bio-safety disposal method for dispelling dichlorodifluoromethane by induction heating and pyrolysis induction heating furnace
  • Bio-safety disposal method for dispelling dichlorodifluoromethane by induction heating and pyrolysis induction heating furnace
  • Bio-safety disposal method for dispelling dichlorodifluoromethane by induction heating and pyrolysis induction heating furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Using commercially available Freon F-11, namely CCl 3 F. The processing steps are as follows:

[0029] (1) Heat the temperature of the metal coil in the cavity of the pyrolysis induction heating furnace 2 to 1000°C and maintain a constant temperature;

[0030] (2) According to the design processing capacity range of the pyrolysis induction heating furnace 1mol / min, the processing capacity of CFCs is determined to be 0.25mol / min. 0.25mol / minCCl 3 F and 0.75 mol / min water vapor are respectively introduced into the heat exchanger 1 through the heat exchanger tube side inlets 11 and 12, and through the heat exchanger 1, the gas inlet 21 of the metal coil 20 of the pyrolysis induction heating furnace 2 Into the metal coil after constant temperature, the residence time of the gas in the metal coil is 1min, and the pyrolysis reaction formula is shown in formula (2):

[0031] CCl 3 F+2H 2 O→CO 2 +3HCl+HF (2); After a full pyrolysis reaction, the pyrolysis reaction gas is discharge...

Embodiment 2

[0036] Using commercially available Freon F-152, namely C 2 ClF 5 . The processing steps are as follows:

[0037] (1) Heat the temperature of the metal coil in the cavity of the pyrolysis induction heating furnace 2 to 1300°C and maintain a constant temperature;

[0038] (2) According to the design processing capacity range of the pyrolysis induction heating furnace 1mol / min, the processing capacity of CFCs is determined to be 0.1mol / min. Make up 0.1mol / minC of raw gas 2 ClF 5 , 0.6mol / min water vapor and 0.3mol / min air are respectively introduced into the heat exchanger 1 through the heat exchanger tube side inlets 11, 12, and 13, and through the heat exchanger 1, the metal in the pyrolysis induction heating furnace 2 The inlet port 21 of the coil 20 is led into the metal coil 20 after a constant temperature, the residence time of the gas in the metal coil is 7 minutes, and the pyrolysis reaction formula is shown in formula (3):

[0039] 2C 2 ClF 5 +6H 2 O+O 2 →4CO 2 +10HF+2HCl ...

Embodiment 3

[0044] Using commercially available Freon F-12, namely CCl 2 F 2 . The processing steps are as follows:

[0045] (1) Heat the temperature of the metal coil in the cavity of the pyrolysis induction heating furnace 2 to 1200°C and maintain a constant temperature;

[0046] (2) According to the design processing capacity range of the pyrolysis induction heating furnace 1mol / min, the processing capacity of CFCs is determined to be 0.14mol / min. The 0.14mol / min CCl that constitutes the raw gas 2 F 2 And 0.84mol / min water vapor are respectively passed into the heat exchanger 1 through the heat exchanger tube side inlets 11 and 12, and passed through the heat exchanger 1 through the inlet 21 of the metal coil 20 of the pyrolysis induction heating furnace 2. Into the metal coil 20 after the constant temperature, the residence time of the gas in the metal coil is 5 minutes, and the pyrolysis reaction formula is shown in formula (5):

[0047] CCl 2 F 2 +2H 2 O→CO 2 +2HCl+2HF (5); after full ...

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Abstract

The invention relates to a pyrolysis induction heating furnace for induction heating and dispelling dichlorodifluoromethane. Preheated raw material gas, namely mixture gas of the dichlorodifluoromethane, water vapor and air, is subjected to the pyrolysis reaction under high temperature condition generated by induction heating, and pyrolysis products are adsorbed and converted. The pyrolysis induction heating furnace includes an existing induction heating furnace, and the furnace body is provided with an inducer, magnet yoke and a crucible. The crucible is arranged in the center of a furnace body chamber. The inducer is arranged around the outside of the crucible. The magnet yoke is uniformly distributed around the inducer. The pyrolysis induction heating furnace is characterized in that a bending metal coiler which is acid resistant and high temperature resistant is arranged in the crucible, the raw material gas containing the dichlorodifluoromethane flows in the metal coiler, and an inlet end and an outlet end of the metal coiler extend from a top cover of the furnace body at the top of the crucible, the power supply frequency is between 10kHz and 300kHz, and the power is between 10kW and 50kW. The invention has the advantages of quick warming speed, little power consumption, high energy utilization rate and pyrolysis efficiency, convenient starting operation, good operation safety and easy scale realization.

Description

Technical field [0001] The invention relates to a harmless treatment method and equipment for heating and digesting Freon, in particular to a harmless treatment method for heating and digesting Freon and a pyrolysis induction heating furnace. Background technique [0002] Freons (CFCs) are composed of four elements: C, Cl, H, and F. They are mainly derivatives of methane and ethane. The scientific name is HCFC. It has stable chemical properties, is not flammable and toxic, and is widely used as a refrigerant, foaming agent and cleaning agent in household appliances, daily chemicals, automobiles, fire-fighting equipment and other fields. However, CFCs will react with ozone in the stratosphere, continuously destroying ozone molecules, resulting in a large amount of depletion of the ozone layer, and ultimately causing many harms to human health and the ecological environment. [0003] At present, there are three main ways to solve the environmental problems of CFCs: ①Reduce the emiss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/78B01D53/70F27B14/08
Inventor 孙贻超卢学强邓小文马建立邵晓龙刘红磊袁敏王哲张艳华
Owner TIANJIN HEJIA VEOLIA ENVIRONMENTAL SERVICES
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