Liquid purification or separation – With means to add treating material
Reexamination Certificate
2000-09-20
2001-05-29
Simmons, David A. (Department: 1724)
Liquid purification or separation
With means to add treating material
C210S199000
Reexamination Certificate
active
06238557
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to apparatus for the chemical treatment of water and, more particularly, to apparatus for injecting two or more incompatible chemicals into a water stream to be treated while advancing within a vessel into which only one opening is available. Throughout this disclosure, the term “water” will be taken to include liquid H
2
O as well as water in its vaporous form, that is, steam
2. Description of the Prior Art
A number of patents are definitive of the present state of the art of water treatment. For example, as disclosed in U.S. Pat. No. 5,514,284 to Uban et al., ozone generation tubes are positioned upstream of filtration beds and downstream of the point where water treatment chemicals are added to the water. By properly arranging the tubes in an array, the tubes will serve as a static mixer Water that passes through the array is agitated, thereby mixing the additive chemicals into the water prior to filtration.
U.S. Pat. No. 5,387,249 to Wiecorek discloses a self-contained chemical injection device for use with toilets which assures that the chemical never comes into contact with the other components in the tank of a toilet bowl, resulting in a more efficient and environmentally safe chemical treatment process for the toilet bowl water.
U.S. Pat. No. 4,286,900 to Sugimote et al. discloses a device for precisely injecting dual chemical fluids for mixing in the ground while preventing earth and sand around the injection device from flowing back through the injection port or ports into the interior of the injection device.
U.S. Pat. No. 5,277,250 to Dela discloses an injector for injecting a liquid treatment chemical into a moving body of liquid in a pipe. The injector includes an elongated hollow quill member having a stem portion of a length to span substantially the inside diameter of the pipe. The stem portion is provided along substantially its entire length with a substantially uniform set of jet openings for injecting the cross section of the body of liquid with a number of chemical treatment jet streams so that the cross section of the body of liquid is treated uniformly across its diametrical cross section.
Traditionally several water treatment chemicals are diluted in a mix tank and fed over a period of time, typically one day. Feed is to a moving bulk stream in the system to be treated. This stream is typically water or steam. Injection of mixture of chemicals is by a single quill into the center of the moving stream.
Water treatment chemicals must be diluted to about 10% with water when fed in this manner. If mixed neat, that is, undiluted, precipitation of one or more of the components is likely to occur. Fittings to accept the injection quill are typically welded into the vessel or piping.
There is a growing trend to eliminate the makedown or dilution step and simply feed each chemical neat directly from the storage tank. This is a safety as well as a labor saving practice. Since two chemical products cannot be mixed neat, each one must have a separate feed or an injection point into the system. This currently requires taking the system off-line and welding a new injection fitting into the system for each additional chemical to be fed.
It was with knowledge of the foregoing state of the technology that the present invention has been conceived and is now reduced to practice.
SUMMARY OF THE INVENTION
According to the present invention, first and second quill members introduce water treatment chemicals to a water stream advancing within water containing equipment having only a single opening. The first quill member extends through a sealed opening on a wall of the equipment and has a first inlet located outside of the equipment, a first outlet located within the equipment in the path of the advancing water stream, and a first passage extending between the first and second inlets. The second quill member is mounted on the first quill member and has a second inlet located outside of the equipment and a second outlet located within the equipment in the path of the advancing water stream. The second outlet is spaced from the first outlet and a second passage, coaxial with the first, extends between the second inlet and the second outlet. A first chemical substance flowing through the first passage and issuing from the first outlet into the water stream thereby avoids mixing in a concentrated form with a second chemical substance flowing through the second passage and issuing from the second outlet into the water stream. The outlet tip ends for the outlet tubes are beveled into the direction of flow of the advancing water stream and each tip end may have a notch formed at an extremity to increase turbulence. The first and second outlets are preferably located at maximum distances from each other and from the walls of the water containing equipment.
The proposed invention will allow two chemicals to be fed neat through one injection point without mixing. The invention consists of a quill within a quill. Chemical A flows through the center quill while Chemical B flows through the larger outer quill and around the exterior of the center quill. The center quill will project further into the moving stream than the out quill. Each chemical then mixes with the moving bulk stream separately. The need to install an additional fitting into the pipe or vessel is eliminated.
In short, the present invention is intended as an improvement of the device disclosed in the Dela patent. That is, in Dela, the elongated hollow quill member is already mounted on the pipe into which a single liquid treatment chemical is injected. For purposes of the present invention, it is desired to inject a second liquid treatment chemical but without requiring the generating a second entry into the pipe. At the same time, it is desired that the two chemicals being injected do not mix before they are fully diluted by the water stream into which they are injected. The injection quill of the present invention is designed to allow chemicals to be diluted by the flowing stream of water or steam without ever mixing in the concentrated form. It is intended that the chemicals never mix in the concentrated form either inside or outside the quill. The main goal of the quill of the invention is to provide an approach for injecting two incompatible chemicals into a moving stream where only one opening is available.
A primary feature, then, of the present invention is the provision of apparatus and a resulting technique for injecting two incompatible chemicals into a water stream to be treated while advancing within a vessel, which may be a pipe, into which only one opening is available.
Another feature of the present invention is the provision of such a system according to which the two chemicals being injected do not mix before they are fully diluted by the water stream into which they are injected.
Still another feature of the present invention is the provision of such a system which utilizes commonly available materials, can be easily fabricated and is inexpensive to install and maintain.
Other and further features, advantages, and benefits of the invention will become apparent in the following description taken in conjunction with the following drawings. It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory but are not to be restrictive of the invention. The accompanying drawings which are incorporated in and constitute a part of this invention, illustrate one of the embodiments of the invention, and together with the description, serve to explain the principles of the invention in general terms. Like numerals refer to like parts throughout the disclosure.
REFERENCES:
patent: 191775 (1877-06-01), Parsons
patent: 4286900 (1981-09-01), Sugimoto et al.
patent: 4331262 (1982-05-01), Snyder et al.
patent: 4986782 (1991-01-01), Severtson
patent: 5008075 (1991-04-01), Rufolo
patent: 5053004 (1991-10-01), Markel et al.
patent: 5127441 (1992-07-01), Rains
Rossi Anthony M.
Ziemer Robert R.
BetzDearborn Inc.
Hoey Betsey Morrison
Perman & Green LLP
Simmons David A.
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