The principles disclosed herein relate generally to the field of steam dispersion humidification. More particularly, the disclosure relates to control and evacuation of unwanted condensate from steam dispersion systems.
Industrial buildings which use steam boilers for heating may use the boiler steam for humidification by injecting it directly into the air. A steam dispersion system panel is used to uniformly disperse the steam into an airstream within an air duct or air handling unit (AHU).
Cool air flowing across the dispersion tubes of the steam dispersion system panel causes some of the steam within the dispersion tubes to condense. This condensate is drained out of the steam dispersion system panel to prevent it from accumulating and entering the airstream with the steam.
The condensate drain of a pressurized steam dispersion panel is typically located on the end of a steam header of the panel opposite of the steam inlet. The velocity of the pressurized steam entering the header of the steam dispersion system forces the condensate to the opposite end of the header where the drain is typically located. If the drain were on the same side as the steam inlet, then unwanted condensate could accumulate in the header and enter the airstream. For this reason, condensate drains are typically located on the end opposite of the pressurized steam inlet.
However, locating the drain on the opposite end of a header from the steam inlet necessitates access to both ends of the header for installation of steam and condensate piping, thus potentially increasing the size of the AHU or reducing the active dispersion area of the panel. Installation costs may also be higher for the piping.
An external condensate drain pipe can be installed underneath the header and sloped back to the steam inlet side of the header, but this may increase cost and requires space underneath the header which may reduce the active steam dispersion area of the panel.
It is desirable for the steam inlet and condensate drain to be on the same side of the header. Access to only one side, instead of both sides, of the header is then needed for steam and condensate piping. This can reduce installation costs and utilize the AHU space more efficiently. However, unwanted accumulation of the condensate is a serious concern as noted above.
Improvements in this area are desired.
The principles disclosed herein relate to improvements in piping of unwanted condensate from steam dispersion humidification systems.
The inventive principles relate to the use of an internal feature or structure within the header which re-directs the flow of the entering steam approximately 180 degrees back towards the steam inlet. The drain port can be located on the same side as the steam inlet since the condensate is pushed towards the drain by the re-directed steam flow. The condensate does not accumulate in the header or enter the airstream. The condensate drain can be located on the same side as the steam inlet while reliably draining the condensate from the header. The advantages of same-side piping are combined with effective condensate drainage from the header without the need for an external condensate drain pipe underneath the header.
The internal steam re-directing feature may include a hollow structure or a pipe through which the steam is transported towards the opposite end of the header. Orifices that penetrate the hollow structure or pipe allow some of the steam to exit to enhance uniform steam distribution within the header and control back pressure before the remaining steam is re-directed approximately 180 degrees back towards the steam inlet side of the header. The redirecting structure can include a 180-degree U-bend of the pipe, two quantity 90-degree bends of the pipe, or multiple styles of deflecting shields or deflectors provided within the header that cooperate with the pipe in re-directing the steam.
In one particular aspect, the disclosure is directed to a steam dispersion system including a steam header defining a first end and a second end, a plurality of steam dispersion tubes extending upwardly from the header, a condensate drain outlet located at the first end of the header, a hollow pipe positioned within the header, the hollow pipe defining a length extending within the header in a direction generally from the first end to the second end, the hollow pipe defining a main humidification steam inlet located at the first end of the header and a main steam outlet within the header, wherein the hollow pipe is configured to receive steam that flows in from the main steam inlet toward the main steam outlet. The hollow pipe may define a plurality of orifices along the length thereof for allowing steam that is flowing through the hollow pipe to enter the header for distribution through the steam dispersion tubes. A steam re-direction structure is configured to direct steam flow leaving through the main steam outlet back toward the first end of the header.
According to another aspect, the disclosure is directed to a humidification steam dispersion system comprising a steam header defining a first end, a second end, and a steam exit point for supplying humidification steam to the atmosphere, a condensate drain outlet located at the first end of the header, a hollow pipe positioned within the header, the hollow pipe defining a length extending within the header in a direction generally from the first end to the second end, the hollow pipe defining a main humidification steam inlet located at the first end of the header and a main steam outlet within the header, wherein the hollow pipe is configured to receive steam that flows in from the main steam inlet toward the main steam outlet, and a steam re-direction structure configured to direct steam flow leaving through the main steam outlet back toward the first end of the header.
According to yet another aspect, the disclosure is directed to a humidification steam dispersion system comprising a steam header defining an interior and a steam exit point communicating with the interior for supplying humidification steam to the atmosphere and a hollow pipe positioned within the header interior, the hollow pipe defining a main humidification steam inlet and a main steam outlet, wherein the hollow pipe is configured to receive steam that flows through the pipe by entering the pipe through the main steam inlet and exiting the pipe through the main steam outlet into the header interior, wherein the main steam inlet and the main steam outlet face in the same direction.
A variety of additional inventive aspects will be set forth in the description that follows. The inventive aspects can relate to individual features and combinations of features. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the broad inventive concepts upon which the embodiments disclosed herein are based.
A steam dispersion system 10 having features that are examples of inventive aspects in accordance with the principles of the present disclosure is illustrated in
As will be described in further detail below, the header 12 is configured to receive steam from a steam source, and the steam is dispersed into duct air through steam delivery points 16 of the steam dispersion tubes 14. The steam source may be a boiler or another source providing pressurized steam. The steam source provides pressurized steam towards the header 12. In the depicted example, each of the tubes 14 communicates with the header interior 18 for receiving pressurized steam. The steam tubes 14, in turn, disperse the steam to the atmosphere at atmospheric pressure. The header 12 is designed to distribute pressure evenly among the tubes 14 protruding therefrom.
In a system such as that illustrated in
Still referring to
The steam delivery points 16 of the steam dispersion tube 14 may be defined by nozzles (i.e., tubelets) provided in the openings 30. It should be noted that in other embodiments, the steam delivery points 16 may be defined simply by the openings 30 of the tubes 14 without the use of any nozzles. Each of the tubes 14 communicates with the header interior 18 for receiving and dispersing humidification steam to the atmosphere (e.g., to an air duct).
Still referring to
The header 12 defines a first end 32 and a second end 34. The first end 32 includes a condensate drain opening 36 for allowing unwanted accumulated condensate to be drained from the system 10.
The header 12 receives the supply steam through a hollow structure or pipe 38 that extends within the header 12 in a direction generally extending from the first end 32 to the second end 34. The hollow pipe 38 defines a main steam inlet 40 at the first end 32 of the header 12, generally adjacent the same side as the condensate drain opening 36 of the system 10.
Supply steam is transported through the hollow pipe 38 towards the opposite second end 34 of the header from the first end 32 that has the main steam inlet 40.
As shown, the hollow pipe 38 includes orifices or openings 42 that penetrate the hollow structure or pipe 38 to allow some of the steam to exit to enhance uniform steam distribution within the header 12 and to control back pressure. The steam distributed through the orifices is used as humidification steam that enters the air duct through the tubes 14 extending from the header 12.
The hollow pipe 38, in the example depicted in
The depicted pipe 38 is configured to re-direct the pressurized steam approximately 180 degrees back towards the steam inlet end 32 of the header 12. The redirecting structure 44 can include a 180-degree u-bend of the pipe, two quantity 90-degree bends of the pipe, or multiple styles of deflecting shields or deflectors 46 provided within the header 12 that cooperate with the pipe 38 in re-directing the steam, as will be discussed in further detail below.
In the example shown in
As noted above, the steam redirecting structure 44 can also include different styles of types of deflecting shields or deflectors 46 that cooperate with the hollow pipe 38 in re-directing steam flow toward the condensate drain 36.
For example, in the depicted example of the system 10 in
The second end 48 of the hollow pipe 38 that defines the main steam outlet/opening 52 can be cut at different angles and dimensions to control the opening 52 to allow optimum steam velocity hitting the deflector(s) 46 to create sufficient force to flow condensation toward the condensate drain 36. The angle and the size of the opening 52 can also be used to control the amount of backpressure to optimize the proper amount of steam dispersed through the orifices 42 along the length of the pipe.
Referring now to
Another example of a deflector 46 in combination with the pipe 38 being used as a steam re-direction structure 44 is illustrated in
The above specification, examples and data provide a complete description of the manufacture and use of the inventive aspects of the disclosure. Since many embodiments of the inventive aspects can be made without departing from the spirit and scope of the disclosure, the inventive aspects reside in the claims hereinafter appended.
The present application claims priority to U.S. Provisional Application No. 62/222,538, filed Sep. 23, 2015, the disclosure of which is hereby incorporated by reference in its entirety.
Number | Date | Country | |
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62222538 | Sep 2015 | US |