US 20090114567 A1
A continuous process and apparatus for treating feedstocks containing carbonaceous materials involves heating bodies to heat the feedstock to vaporize and crack hydrocarbons and carbon formed on heating bodies is removed through direct contact to a flame heater.
1. A process for processing materials with a major proportion of hydrocarbon component:
contacting the materials directly with heated iron balls to heat the materials to a temperature to vaporize and crack the hydrocarbons in the material;
recovering vapors produced by the contacting.
2. A process for processing materials with a major hydrocarbon content comprising:
contacting in an oxygen-free atmosphere the materials directly with heating bodies that have been heated, the contacting sufficient to heat the materials to a temperature to vaporize and crack hydrocarbons in the material;
in an oxidizing atmosphere heating and moving the heating bodies to remove carbon formed on the heating bodies by combusting the carbon and by moving the heating bodies such that the moving removes carbon by abrading the carbon;
directing the heating bodies from the heating to the contacting the materials;
recovering vapors from the cracked and vaporized materials produced during the contacting;
the heating bodies heated during the heating sufficiently to heat the materials during the contacting of the materials.
3. A process as in
4. A process as in
5. A process as in
6. A process as in
7. An apparatus for processing materials with a hydrocarbon content comprising;
a continuous mixer configured to transport feedstock and heating bodies co-currently through the mixer in non-oxidizing conditions such that hydrocarbonaceous material the feedstock is heated by the heating bodies sufficiently to vaporize and crack the hydrocarbonaceous materials;
a continuous heater configured to heat and move the heating bodies under oxidizing conditions and moving conditions to remove carbon deposits from the balls through oxidation and abrasion of the carbon deposits;
the mixer and heater arranged to continuously cycle the heating bodies through the mixer, into and through the heater, and back into the mixer.
8. An apparatus as in
9. An apparatus as in
10. An apparatus as in
This application claims priority from U.S. Provisional Application 60/986,284, filed Nov. 7, 2007, which is hereby incorporated by reference.
The present disclosure relates to processes for hydrocarbonaceous feedstocks containing a high percentage of hydrocarbons, such as heavy liquids and solids, which require vaporization and cracking to make diesel fuel and other fuels. These processes are frequently used to process liquids such as used motor oils, and solids such as tires. A problem with these kinds of processes is that the vaporization and cracking of the hydrocarbons results in the formation of carbon on the heat source, which then can interfere with and foul up process equipment. This requires frequent shut-downs and maintenance.
A process that avoids the problems due to carbon buildup can be practiced with the use of heating bodies, such as iron balls. Hot iron balls are mixed with hydrocarbonaceous feedstock under non-oxidizing conditions, to vaporize and crack hydrocarbon materials in the feedstock. A buildup of carbon or coke will form on the iron balls during the vaporization and cracking process. To remove the carbon, the heating bodies are then continuously circulated through a heating unit under oxidizing conditions where the balls are passed through a heating fire to burn off carbon. In the heating unit the balls are rolled and exposed directly to a heating fire. The rolling action rubs carbon deposits off the balls and the oxidizing conditions oxidize carbon. After balls are reheated and cleaned of coke, they are recirculated to the mixing chamber through a vapor-lock feeder. Vapors leave the mixer and pass through incoming heated iron balls to further crack vapors as needed to make fuels of a desired viscosity. Nonvaporized feedstock materials are removed from the mixer/vaporizer with iron balls and separated out before or after iron balls circulate through the heater.
Reference is made to
Used motor oil is introduced into a mixer 11, through an inlet conduit 13. The motor oil can be introduced into a first end 15, as illustrated in
In both cases, the iron balls mix with the oil and heat the oil to a temperature that will vaporize the hydrocarbon, crack hydrocarbons in the feedstock, and crack volatilized hydrocarbon vapors. Accordingly, the mixer also functions as a vaporizer and cracker. The mixer may also be inclined to carry the balls upward to the heater 25, and thus functions as an elevator. The drum of the mixer is disposed in a containment 27 and has appropriate vapor lock transporters 29 for solid material transfer in and out of the mixer to maintain a non-oxidizing environment.
At the second end of the mixer, the balls and any other nongaseous materials carried up by the flight are withdrawn from the mixer and passed to a heater 25 using a vapor lock system 29 to exclude air from the mixer. In the mixer, some carbon formed upon the balls is removed by the rubbing or abrasive action of the balls in the mixer. The non-gaseous materials withdrawn with the balls includes this carbon, as well as any other solid and non-gaseous materials, such as solid unreacted or partially reacted hydrocarbons in the feedstock and inert materials, which include mineral and metal contaminants. If the feedstock includes shredded tires, such solid materials may include tire cord materials, such as steel and unvolatized polymers.
The balls can be exposed and heated by the fire by any suitable system, that may, for example, include elevating and and dropping the balls through the fire. In
The heater also functions to heat the iron balls to a high temperature. When these heated iron balls are introduced into the mixer, they must be hot enough to sufficiently heat the feedstock to vaporization and cracking temperatures in the mixer.
After leaving the heater any remaining solid materials are separated from the balls, and the balls are recycled back through a vapor-lock transport to the mixer. The separation may be by any suitable technique, such as screening. Effluent combustion gasses from the heater are directed to a stack 45 or other suitable structure.
The vapor-lock transport inlet 29 to mixer can also function as a cracker, as particularly shown in
The heating bodies are transported from the vapor lock transport 29 back into the mixer, to again be transported through the mixer.
The vapors from the vapor lock transport are passed to a condenser 41, where condensible liquid hydrocarbons are produced for fuels and as hydrocarbon feedstocks. The non-condensible vapors from the condenser are recycled back to the heater, where they are used as fuel for the heater.
Optionally heat from condensing the vapors can be used to pretreat the feedstock to remove both condensible vapors and water in the feedstock before it is heated and cracked in the mixer. These vapors can be passed to the burner of the heater. A counter-flow heat exchanger using hot vapors to heat the feed stock can be used in this function, where it acts as a vapor condenser-feedstock heater.
The heating bodies may be any suitable material that can be heated and transfer heat in the process, and is tough enough to withstand the tumbling in mixer and heater. In addition, denser materials are preferred to help with the removing of the carbon effect in the heater. Balls of iron, or an iron alloy, have been found suitable. Reference to “iron balls” or “balls” in this disclosure refers generally to heating bodies of any suitable material.
While this invention has been described with reference to certain specific embodiments and examples, it will be recognized by those skilled in the art that many variations are possible without departing from the scope and spirit of this invention, and that the invention, as described by the claims, is intended to cover all changes and modifications of the invention which do not depart from the spirit of the invention.