Gas and liquid contact apparatus – Multiple gas
Patent
1993-12-16
1995-01-10
Miles, Tim
Gas and liquid contact apparatus
Multiple gas
261DIG13, 261 503, B01F 304
Patent
active
053804708
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a method and apparatus for reducing the pressure and temperature of steam in a steam conditioning valve, in which steam flow is regulated in a plug perforated by a plurality of holes, a greater or less number of holes being uncovered or closed off in response to the plug movement along a seating formed inside the valve, simultaneously as cooling water is taken into the upper part of the valve such as to be regulated with the aid of a water seat and a plurality of calibrated holes in a hollow valve spindle passing through the plug, and in proportion to regulation of the process steam, this cooling water then being taken through the hollow valve spindle for ejection via a jet downstream in relation to the center of the departing steam flow.
In previously known steam conditioning valves of a similar kind at present on the market, steam conditioning is achieved by spraying finely divided water or condensate into the downstream or low pressure side of the valve. The coolant is taken into the valve via a so-called water collar in the upper part of the valve, adjacent a yoke for the valve operating means, and subsequently into a hollow valve spindle through a plurality of holes in the upper part thereof, this part regulating the water supply. The spindle constitutes an integrated part of the valve plug itself. An outside cooling water regulating valve compensates for pressure and temperature variations in the coolant and also for temperature variations in the superheated steam.
The coolant or condensate is sprayed in downstream of the valve main seating through the hollow valve spindle and into the center of the steam flow, where the steam velocity is greatest, pressure low and turbulence very great. These factors contribute to an effective admixture of the coolant to the steam, resulting in rapid vapourisation. Downstream of the valve the steam velocity is reduced once again, and kinetic energy is converted to heat. This further contributes to rapid vapourisation of the coolant. The actual steam pressure regulation through the valve is performed with the aid of a plug, which is perforated by a large number of holes having different dimensions, thus achieving an optimum pressure regulation characteristic for the valve. The plug is guided by a seating, a greater or less number of these holes being uncovered or closed off to obtain regulation, depending on the position of the plug along the seating. However, it has been found with this type of valve that it is difficult to achieve fully satisfactory cooling for small increments of valve openings, i.e. those under 15-20%.
The object of the present invention is thus to provide a method and apparatus of the kind mentioned in the introduction, wherewith the above-mentioned drawbacks are mitigated. The distinguishing features of the invention are disclosed in the accompanying claims.
As a result of the invention the above-mentioned problem of leading steam to, and past the cooling water jet for small opening increments of the valve has been solved, hence substantially improving cooling due to the steam breaking up the cooling water jets into very small droplets. This also results in that the water is more easily vapourised, while cooling is made more effective.
The invention will now be described in more detail with the aid of a preferred embodiment, and with reference to the accompanying drawings, where
FIG. 1 is a schematic cross-section of a steam conditioning valve in accordance with the present invention,
FIG. 2 is an enlargement of the lower part of the valve in FIG. 1, and
FIG. 3 is an enlarged depiction of the valve plug illustrated in FIG. 1, and its integration with the valve spindle.
As will be seen from the drawings, the steam conditioning valve 1, in accordance with the preferred embodiment, includes a valve housing 2, into which process steam is taken via an inlet 3. Inside the housing 2 there is a valve seating 4, coacting with a plug 5, the lower, sleeve-like part of which is perforated by a plurality of holes 6 for regul
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patent: 2355458 (1944-08-01), Mastenbrook
patent: 3134827 (1964-05-01), Pontow et al.
patent: 3732851 (1973-05-01), Self
patent: 4011287 (1977-03-01), Marley
patent: 4071586 (1978-01-01), Seger
patent: 4505865 (1985-03-01), Wullenkord
BTG Kalle Inventing AB
Miles Tim
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