Evaporation apparatus for treating waste water

1. An evaporation apparatus comprising:

a. a substantially enclosed burner unit comprising:

i. an upper mixing chamber comprising a fuel inlet and an air inlet, said mixing chamber feeding an intermediary flame chamber comprising a pilot assembly, said flame chamber feeding a lower burn chamber comprising an outlet and an annulus around its perimeter, said annulus comprising an inner wall having at its top an opening to said burn chamber;

ii. a fluid chamber situated externally around a lower portion of said mixing chamber and said flame chamber, said fluid chamber having a fluid inlet and a fluid outlet, said fluid outlet leading to said annulus;

b. an air train connecting to said air inlet and to said pilot assembly;

c. a gas train connecting to said fuel inlet and to said pilot assembly; and

d. a metered fluid train connecting to said fluid chamber, said metered fluid train configured to control the flow rate of fluid through said fluid inlet and to said fluid chamber.

2. The evaporation apparatus of claim 1 wherein the mixing chamber fuel inlet comprises a gas orifice pipe having a plurality of holes.

3. The evaporation apparatus of claim 1 wherein the air train is configured to deliver variable flow rates of air to the mixing chamber.

4. The evaporation apparatus of claim 1 wherein the gas train further comprises a heat exchanger upstream from the burner unit.

5. The evaporation apparatus of claim 1 wherein the gas train is configured to deliver variable flow rates of fuel to the mixing chamber.

6. The evaporation apparatus of claim 1 wherein the burner unit is configured to operate using well head gas as fuel flowing through the fuel inlet.

7. The evaporation apparatus of claim 1 wherein the metered fluid train further comprises at least one filter upstream from the burner unit.

8. The evaporation apparatus of claim 1 wherein the fluid is waste fluid.

9. The evaporation apparatus of claim 1 wherein the fluid is produced water.

10. The evaporation apparatus of claim 1 further comprising a separator downstream from the burner unit.

11. The evaporation apparatus of claim 10 wherein the separator is a horizontal vortex separator.

12. The evaporation unit of claim 10 further comprising a particulate matter scrubber downstream from the separator.

13. The evaporation apparatus of claim 12 further comprising a washing chamber of the particulate matter scrubber and a chemical reagent line coupled to the particulate matter scrubber at a location upstream from the washing chamber.

14. The evaporation apparatus of claim 1 further comprising a separator unit coupled to an outlet from the burner unit, the separator unit comprising:

a. a substantially enclosed cylindrical body having a front, a back, and a continuous wall therebetween, said continuous wall having a top and a bottom;

b. a horizontal inlet at an upper position in said front;

c. a vapor outlet comprising an elongated stack extending upward from said top near said back;

d. a concentrate outlet extending downward from said bottom near said back; and

e. a plurality of baffles extending inward from the inner side of said continuous wall so as to create a series of adjoining chambers, said baffles angled so as to create a vortex flow pattern therebetween.

15. The evaporation apparatus of claim 14 wherein the plurality of baffles comprises a front baffle extending from the top of the continuous wall at an angle relative to the inlet of about 100° to about 110°.

16. The evaporation apparatus of claim 15 wherein the plurality of baffles comprises a second baffle downstream of the front baffle, the second baffle extending from the continuous wall at about 90° relative to the bottom.

17. The evaporation apparatus of claim 14 wherein the separator unit comprises two baffles and three adjoining chambers.

18. The evaporation apparatus of claim 14 wherein the plurality of baffles are further configured to result in a cyclonic flow pattern in chambers adjacent to the front and adjacent to the back.