| |
 |
Thermal treatment
of wastes has become the premier method of disposing of hazardous
and non-hazardous wastes worldwide. Zeeco offers a complete
line of liquid and fume incinerators or thermal oxidizers
as they are also called, to safely and effectively dispose
of waste streams such as tail gas, acid gas, chlorinated hydrocarbons,
waste gases and waste liquids.
Because of the high temperatures associated with incineration,
many Zeeco systems incorporate Waste Heat Recovery equipment
to reduce operating costs or provide steam for other plant
operations.
Proven air pollution control devices such as scrubbers are
also used to remove particulate matter and inorganic acids
from the flue gas. Depending on the components of the flue
gas, one or more devices can be incorporated into a waste
treatment system. Bag houses, venturi scrubbers and ionizing
wet scrubbers are designed to control particulate. Absorbers
and scrubbers clean the acid gases present in the flue gas.
Quench systems, conditioning towers and heat exchangers lower
the temperature of the flue gas.
Zeeco also designs and builds a complete array of equipment
for sulfur plants. Reaction furnaces, inline reheat burners,
acid gas burners, Claus combustion chambers, reduction furnaces
and double walled stacks are just a few of the vessels available.
Complete combustion and process control systems and packaged
fuel skids are provided to optimize operation of these complete
systems.
 Download
Zeeco's Incinerator Specification Sheet in Microsoft Word
format.
- Vapors
- Hydrocarbon
- Halogenated
- Nitrogen bound organic vapors
- Sulfur bearing vapors
- Vapors with Particulates
- Liquids
- Hydrocarbon
- Halogenated
- Nitrogen bound
- Nitrogen bound / Halogenated
- Liquids with Particulates
- Combination of Liquids and Vapors
 Direct
Fired Air Heaters are used in a variety of industries such as
paper, mineral, and chemical processing as a way to efficiently
heat a wide variety of products. Some typical applications include
atmospheric control; catalytic cracking startup; driers; fluidized
beds; refractory drying and curing; kilns and stress relieving.
Direct fired air heaters can be designed to operate in a temperature
range of 150°F to 2000°F. Air heaters can fire natural
gas, oil or propane. Combustion volumes and flame intensities
are carefully designed for their required duty.
Download
Zeeco's Air Heater Specification Sheet in Microsoft Word format.
 A
Claus Plant (also called Sulfur Recovery Unit - SRU) is used
to recover elemental sulfur from "tail gas" - streams containing
hydrogen sulfide (H2S). The reaction chemistry is the partial
oxidation of H2S to elemental sulfur and the total oxidation
of any hydrocarbons.
The 6 main pieces of equipment are described below in the order
of operation.
- Acid Gas Burner: Roughly 1/3 of the gas is burned
with enough air or oxygen to produce sulfur dioxide (SO2)
and to burn the hydrocarbons. These burners create a high
intensity combustion zone for the reaction of air with the
acid gas. The use of high intensity burners, with the high
turbulence and thus excellent mixing ensure the reaction
quickly approaches equilibrium.
- Reaction Furnace or Thermal Reactor: Has the acid
gas burner attached and provides residence time for the
reaction to proceed. In a typical design, this reactor has
two chambers separated by a choke or checker board. Into
the second chamber the bulk of the remaining tail gas is
fed and the SO2 reacts with the H2S to form water and elemental
sulfur.
- Waste Heat Boiler: The energy from the combustion
is used to produce steam and as the gas is cooled, sulfur
is recovered as a liquid. Fire-tube boilers are used for
low steam pressures. They are recommended when flue gases
contain inorganic acids such as HCl and H2SO4.
- In-line Reheat Burners: They can be used to burn
tail gas and reheat the remaining gas mixture before a catalytic
reactor.
- Catalytic Reactor: These catalyst beds help to
react any remaining H2S and SO2. Multiple In-line burners
and catalytic reactors can be used to improve sulfur recovery.
- Acid Gas (Tail Gas) Incinerators: They treat sulfur
containing acid gas from the Claus plant plus vent lines
from the sulfur pit and other locations. The trace sulfur
compounds remaining are oxidized to sulfur dioxide.
Process concerns include high temperatures which make it paramount
that the correct refractory be selected. Also, too low of temperatures
are a concern, as acid gases can condense and lead to fast corrosion
of the carbon steel vessels.
Download
Zeeco's Acid Gas Burner Specification Sheet in Microsoft Word
document.
Download
Zeeco's Reaction Furnace Specification Sheet in Microsoft Word
document. |
|
|
Burners