SU954693A1 - Liquid evaporation method - Google Patents

Description

(54) LIQUID-EVAPORATION METHOD

one

The invention relates to energy and can be used, for example, to produce vapors of corrosive liquids.

There is a known method of evaporation of a liquid by reducing the pressure in it below the saturation pressure by reducing the swirling radius of the fluid flow in the centrifuge tl.

The disadvantage of this method is the limitation, the range of applications and the high power consumption.

There is also known a method of evaporating a liquid in a canape by heating it above the saturation temperature o (expanding, 5 C23 vapor.

The disadvantages of this method are low reliability and high material intensity, due to the fact that in order to increase the degree of dryness of steam, it is not necessary to increase the pressure of the "sidness".

The purpose of the invention is to increase reliability and efficiency by reducing the JB of the evaporated liquid.

This goal is achieved by the fact that the heating of the liquid is carried out at a saturated vapor pressure at a rate calculated by the formula

(l-ch)

d,

(t-t) "3 / p5

where c is the rate of fluid overheating,

° C / s;

t is the heating temperature of the liquid, C; t is the saturation temperature, C; 3 — average for the volume of the heated liquid nucleation rate, m

; h evaporation rate, kg / s

but

- LIQUID DENSITY,

I. - density of boiling centers on

G1

channel surfaces, m -,

m

S cross-sectional area

channel, m

and the temperature of the channel walls is maintained below the temperature of the limiting overheating of the evaporated liquid.

Fig. 1 shows the device dp of re-mixing of the proposed evaporation method, general view; FIG. 2 is a section, A-A in FIG. one; in FIG. 3, node I in FIG. one.

The device comprises a housing 1 with a steam pipe 2 for supplying a liquid and a liquid collector 3 connected to steam generating channels 4 connected to the steam collector 5. The space between the channels 4 is connected to pipe 6 to a source of heat carrier. Evaporate - liquid, in this case N-pentane, at room temperature and. atmospheric pressure is pumped through pipe 2 into liquid collector 3, from where it is distributed through steam generating channels 4, the walls of which are made of glass that is well wetted with N-pentane. Through pipe 6, the coolant is fed with saturated water vapor, which condenses on the walls of the steam generating channels 4, heated to saturation temperature, and then overheating H-Pentane with speed, cj (t-tg) -JJ 3 / p. Channels 4 are maintained below the temperature limit of H-pentane, which under these conditions is 146 ° C. The condition a / (t tg IJ P and / 3 5 is achieved by choosing the material of the walls of the steam generating channels 4, which is well wetted by H-Pentane, and the number of evaporation centers on these walls is almost zero. When H-Pentane is overheated, its intense evaporation this pressure does not change, and the temperature drops sharply and becomes equal to the saturation temperature and pentane at atmospheric pressure. The resulting vapors are discharged through the steam detector 5 "The performance of the device is controlled by changing the temperature of the water vapor ra, at about a temperature, there is a dramatic increase in productivity caused by volumetric boiling up of a liquid.The maximum performance of the device is reached at a water vapor temperature equal to the temperature of the limit overheating and -pentane (), with further increase in

Peripheral production, evaporation drops sharply to almost zero due to the boiling up of H-Pentane on the surface of capillaries, which prevents the overheating of H-Pentane.

Claims (1)

The proposed method of evaporating a liquid without reducing the stability of the evaporation process reduces the pressure in the liquid. This makes it possible to use wider cool materials for the manufacture of evaporators, which is very important when working with chemically aggressive liquids when dealing with chemically resistant, but mechanically low-strength materials. The invention of the method of evaporating a liquid in a canape by heating it above the temperature during the formation of steam, about the same, which, in order to increase the reliability and efficiency of reducing the pressure in the evaporating liquid, liquids are carried out using the saturated vapor pressure with the vapor pressure of copious vapor calculated by the formula Kt-t5) VbTF (t-t3) Qn3 / J3S 1 — liquid overheating rate, ° C / s; -the temperature of the heating fluid, OS; - saturation temperature, ° C; - average for the volume of the heated liquid, the frequency of the Zaro-3 -1, breathing, c. evaporation rate, kg / s; - fluid density, kg / m - density of boiling centers on the channel surface, - perimeter of the channel cross section, m; B — cross-section to the channels, m, and the temperature of the channel walls is maintained below the temperature of the limiting superheat of the evaporated liquid. Sources of information taken into account in the examination of 1, USSR Copyright Certificate No. 419687, cl. F 22 V 3/04, 1974, 2, US Patent No. 3326640, cl. B 01 J 1 / OO, published, 1967, Tefr o aCi / fTTf fr FIG. 1) f (od / facmu fig.Z