Apparatus for treating a gas formed from a waste in a molten metal bath

• US 5,776,420 A
• Filed: 09/05/1996
• Issued: 07/07/1998
• Est. Priority Date: 07/29/1991
• Status: Expired due to Fees

• Current Assignee: Quantum Catalytics LLC
• Original Assignee: Molten Metal Technology Incorporated
• Inventors: Nagel, Christopher J.
• Primary Examiner(s): MCMAHON, TIMOTHY M
• Application Number:
  US08/711,693
• Time in Patent Office: 670 Days
• Field of Search: 48/92, 422/184
• US Class Current: 422/184.1
• CPC Class Codes: A62D 2101/04 Pesticides, e.g. insecticides, herbicides, fungicides or nematocides
• CPC Class Codes: A62D 2101/06 Explosives, propellants or pyrotechnics, e.g. rocket fuel or napalm
• CPC Class Codes: A62D 2101/20 Organic substances
• CPC Class Codes: A62D 2101/22 containing halogen
• CPC Class Codes: A62D 2101/40 Inorganic substances
• CPC Class Codes: A62D 3/32 by treatment in molten chemical reagent, e.g. salts or metals
• CPC Class Codes: B01D 53/34 Chemical or biological purification of waste gases
• CPC Class Codes: B01D 53/70 Organic halogen compounds
• CPC Class Codes: B01D 53/74 General processes for purification of waste gases; Apparatus or devices specially adapted therefor B01D53/92 takes precedence

Abstract

A method and a system is disclosed for treating a gaseous discharge stream formed from a waste in a molten metal bath. The waste is directed into a reactor containing a molten metal bath. The molten metal bath has operating conditions which are sufficient to dissociate the waste and form a gaseous discharge stream including a dissociation product. The gaseous discharge stream is cooled in a cooling section and the dissociation product is separated, as a particulate, from a gaseous component of the gaseous discharge stream. The fluid particulate stream is recirculated to the gaseous discharge stream in a reaction section of the apparatus.

Claims

1. An apparatus for treating a gaseous discharge stream formed from a waste in a molten metal bath, comprising:

a) a reactor having a molten metal bath formed therein and a gaseous discharge port above the molten metal bath;

b) a reaction section extending from the gaseous discharge port;

c) a cooling column extending from the reaction section;

d) separation means in fluid communication with the cooling section for separating a particulate dissociation product from a gaseous component of a gaseous discharge stream formed from a waste in the reactor and passing from the reactor through the reaction section and the cooling column into said separation means;

e) a gaseous discharge conduit extending from the separation means;

f) a cooling section extending from the separation means for cooling a particulate stream formed of the particulate dissociation product separated from the gaseous discharge stream in said separation means;

g) a recirculation conduit extending from the cooling section to the reaction section for conducting at least portion of the particulate stream from the cooling section to the reaction section; and

h) a recycle conduit extending from the cooling section to the reactor for recycling a portion of the particulate stream from the cooling section to the reactor for submerged injection into the molten metal bath.

2. An apparatus for claim 1 further including a second reactor and means for conducting a portion of the particulate stream from the cooling section to a second molten metal bath formed in said second reactor.

3. An apparatus of claim 2 further including make-up means connected to the reaction section for directing a particulate into the reaction section as the gaseous discharge stream passes through the reaction section, whereby a particulate bed can be formed in the reaction section and in the cooling column.

4. An apparatus of claim 3 further including a filter connected to the gaseous discharge conduit for separating a residual particulate component from the gaseous discharge stream.

5. An apparatus of claim 4 wherein the filter includes a porous plug.

6. An apparatus of claim 5 wherein the porous plug is formed of a ceramic material.

7. An apparatus of claim 4 wherein the filter includes an adsorbent.

8. An apparatus of claim 1 wherein the separation means includes a cyclone.

9. An apparatus for treating a gaseous discharge stream formed from a waste in a molten metal bath, comprising:

a) a reactor containing a molten metal bath, the reactor including means for directing a waste into the reactor, wherein a gaseous discharge stream is formed from the waste, and means for discharging the gaseous discharge stream from the reactor;

b) a recirculating fluidized bed reactor for treating the gaseous discharge stream;

c) means for directing the gaseous discharge stream from the reactor to the recirculating fluidized bed reactor; and

d) recycling means extending from the recirculating fluidized bed reactor for recycling a portion of a particulate stream from the recirculating fluidized bed reactor to the reactor containing the molten metal bath for submerged injection into the molten metal bath.