SU971410A1 - Degassing column - Google Patents

Description

The invention relates to energy and is intended for the degassing of a liquid.

Known columns for thermal deaeration of water, containing vertically or inclined metal sheets, on which water flows as a film. Between the sheets, steam 1 is moving towards the film.

The closest in technical essence and the achieved result is a degassing column comprising a body, a sprinkler, a package of expanded-stretch meteschic sheets arranged horizontally in the body, so that the vertical planes passing through the large axes of their slits are perpendicular to each other 2 .

The bottom of this column is a significant reduction in the degassing depth in the case of the supply of water to it, not, the heating of which exceeds 30 ° C. (Here and below underheating of water, the difference between the saturation temperature at the pressure in the column and the temperature of the water entering the column is indicated).

The deterioration of degassing in a known column with increasing water heating is explained as follows. The small gaps between expanded metal sheets (50-60 mm) do not ensure the disintegration of water streams into droplets between the sheets. In addition, because of the small height of the gaps, the rate of falling of the streams is small and, therefore, the speed of water movement relative to steam is small.

The minimum values of the relative velocities of water and steam do not allow obtaining high values of the heat transfer coefficient 15. The weak disintegration of water streams into droplets does not provide a developed heat exchange surface. This leads to the fact that at large subheating the deaerated water is not heated to saturation temperature, as a result of which deep degassing cannot occur.

In the case of a small underheating of water (and less), despite the noted drawbacks, the water in the column can be heated to saturation temperature.

However, the outgassing of water is deep to a residual concentration of oxygen

Claims (2)

30 10 mcg / kg and less - and in this case the cost of beats is i-i e i-i a, since And for the sake of deep degassing, an active no / iopxHocTH water update takes place on the rojiii.vo needle sheets when the streams turn into a film and the plenum into streams. In the intervals between the sheets, the surface of the jet is renewed weakly; therefore, deep degassing} i washed up the ducks does not develop. The whole 1 -th fret of the image is ncraL.cutMJHe intensity tag and mass a and degassing depth in the column. To achieve this goal, a lagazation column containing the body, irrigate, a package of flat expanded: stretched sheets arranged horizontally on the D body, read: vertical planes, pass uijTc. -: eroz Oo / 1a.me axis of their hotels, per pon, chi; -: ul; 11, -; ny1. to him by himself, equipped with a measure of degassing, out; ngid sheets g; od irrigate JiGM and; - MOi-: vr; efT height 2.7-3.5 heights iiaiccTa JTjiCToB; at the same time twists laid iiJVoTHo on each other :. B; i ;; ny limit sogi: osh; Neither the heights of this; C m 2 C t m e m p a r C u r: c e d o g e o w o; -: а: 0 psi to a column of water of 30 ° C, vert; temperature below saturation; va. .and. npoTH Kent ocTb svo (H:; d; k;: D ::: Tsleni streams wold to the top of the chamber -;:: -: contributes to the scaled-down. ny water streams per kgtl and increase in water ingress relative to ia (. This allows rEOJiy iSiTb high values of heat transfer coefficient, as well as un-ag; and-: heat exchange surface. Laying out slotted sheets 3 without a gap in the column area allows to intensify the process of deeper 3 a i; vi and odes. In Koka; Ke, the process of heat mass exchange and degassing of the gas is evolving to such an extent that with the heating of the cell (when it is added in column 1., 2 atm, underheat Eve corresponds to the water temperature at the inlet to the column 14c), the oxygen concentration in the deaerated: syde at the outlet from the column is below 6 m; hg / m. The drawing shows a general view of the gas column in the 1st outlet, In the lower part of the housing 1 there is a pa Steam pipe 2 for the supply of steam. A pipe of perforated-exhaust sheets (lower zone) is located at the inlet nozzle. The pre-degassing chamber 4 is located above the lower zone. Above the lower zone. The sprinkler 5 is located in the upper chamber of the column. The sprinkler 6 is located above the sprinkler. The column housing is closed with a conical bottom 7 with a branch pipe 8 to remove the vapor from the column. A degassing column is installed on the tank ak; mind:) a torus 9. The column works as follows. The deaerated water through the nozzle 6 and the sprinkler 5 enters the upper chamber 4. After that, it is heated by steam leaving the lower zone 3, d, about the saturation temperature:. From the upper chamber, water enters the first in its course sheet of the lower zone 3, and then on all subsequent sheets stacked on top of each other. Water in the form of streams flows from the lintels of the overlying, sheet to switch over to the bottom sheet. At the same time, the surface of the water is renewed on the side surface and On the edge of the sheet. Tfip: ioc stupidly enters zone 3 of i.Mje-3 nozzle 2. goes from bottom to top through the holes in the sheets and, about -2L, with turbulent flows of the zodus and renewed surface of the zod, deeply degassing it. From the last, along the sheet, the degasirovannaya node flows into the battery tank 9, Vrtar is removed from the iCpe column at pipe 8. In this degassing ope, the values of the heat-transfer coefficients. ; -Asschange by 15-20% all over., than in the well-known. The supply to the degassing column of water with a low temperature (underheating of 90 ° C) makes it possible to reduce the corrosion of heat exchangers for heating the water before d, and in a number of cases refuse them. DETAILED DESCRIPTION OF THE INVENTION A degassing column comprising a body, a sprinkler, a package of flat expanded g-metal sheets arranged horizontally in the body, so that the vertical planes 11 aperture through the large axes of their slits are perpendicular and that with the aim of increasing: the intensity of heat and mass transfer Y of increasing the depth of water degassing in the column, it is supplied with a chamber; preliminary degassing, placed above the sheets under the irrigator and having a height equal to 2.7-3.5 times the stack of sheets, while the sheets are stacked tightly on each other. Sources of information; 1; 1, taken into account in the examination of 1, Odiker I.I. and Perm V.I. Therm} -r-1esca water deaeration in thermal power plants, Energie, L., 1971, p. 26-32. 2. Kolev N.N., Da.rakchiev R.D. The main results of tests of the deaerator model with a horizontal sheet nozzle, Teploz: nprgetika, 1975, No. 8, p. 91-92 (npoTOTiin).