SU1315003A1 - Method of separating liquid from hot gases - Google Patents

Abstract

The invention relates to methods used in industrial power engineering and makes it possible to increase the efficiency of gas purification. The method includes a three-stage purification: at the first stage, turbulent-inertial sedimentation and condensation of vapors in a cooled separating element are carried out, the second purified gas is heated to the initial temperature and evaporation of elusive droplets in the heated separating element; cooled separating element with a temperature gradient in the wall layers (2-5) -10 ° C / m. When used in the second stage for heating the water vapor, after the separating element it is fed to the inlet of the third stage gas to be purified. 2 hp f-ly, 3 ill. i (L SAE ate

Description

The invention relates to industrial power engineering and can be used in ship air-conditioning systems and in the chemical industry for trapping aerosols.

The aim of the invention is to increase the gas cleaning efficiency.

Fig, depicts a device that implements predvizamid method, front view; figure 2 is the same, top view; FIG. 3 is a plot of the rate of deposition of droplets on the temperature gradient in the boundary layer of the separating elements.

The implementation of three successive stages according to the method of separating the liquid from the hot gases makes it possible in the first stage to separate large droplets (more than 1 µm) and liquid vapors to their concentration corresponding to the saturated state at the temperature of the cooled surface, while the precipitation of the droplets occurs in mainly due to the turbulent inertial effect. At the second stage, the purified gas is heated to the initial temperature and the vaporization of the separated liquid is vaporized by evaporating uncooled small drops (less than 1 µm). Heating the gas to the initial temperature eliminates the decomposition of the liquid into its constituent elements. Drops less than 0.5 microns have a penetrating increased ability through the separating elements, since their sizes are commensurate with the size of the moles of gas. Converting such droplets into a vapor state and saturating the gas with vapor-separated liquid will significantly reduce the number of the most penetrating droplets in the stream; non-evaporating drops acquire an initial elevated temperature. At the third stage the con

densification of vapor and precipitate-45 divided into steps 2-4 with the drop of non-evaporated droplets under the action of thermophoresis forces in the cooled separating elements and removal of the purified gas.

Thermophoretic sedimentation of droplets with gradients in the near-wall layers (2–5) is 2–4 times higher than isothermal conditions with acceptable energy consumption.

In addition, in the case of using as a hot heat carrier, water vapor increases the cleaning efficiency in a cooled stage.

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due to the mass flow of steam to the cold surface and condensation enlarging of moisture in the separation elements.

The method of separating the liquid from the hot is as follows.

Hot gas, for example, from a gas turbine propulsion system with a temperature of 80-100 ° C, is directed to the preliminary separation of large droplets (more than 1 µm) and condensation of vapor into cooled separation elements. Here the gas temperature decreases to the temperature of the cooled water (cold coolant); at the outlet, the gas contains droplets of less than 1 micron and a vapor concentration equal to the saturated state at cold water temperature. The deposition of droplets more than i µm occurs due to the turbulent-inertial effect, since the effect of thermophoresis does not appear on them. As the separating elements, it is advisable to use annular corrugated multilayer mesh. Capture of droplets of less than 1 micron, commensurate with the size of molecules and having the most penetrating properties through separating elements, is carried out by evaporating them to saturation density at the temperature of the hot heat carrier, followed by condensation in cooled separating elements. The deposition of uncorrected drops mainly occurs due to thermophoresis forces at temperature gradients in the near-wall layers of the separating elements (2-5). The final vapor concentration is equal to the saturation density at the temperature of the cold heat carrier. Heating of the gas to the initial temperature eliminates decomposition of the liquid being cleaned.

The device consists of a housing 1,

inlet pipes 5-7 and outlet gas 8, separating elements 9 located between the disks 10 and I with channels 12 for circulating coolant, discharge pipes 13 and condensate 14, condensate outlet 15, inlet pipes 16 and outlet 17 of the heat carrier (steam), tubes 18 for supplying steam to a cooled stage, tubes for supplying 19 and discharging 20 cold water with collectors 21 and 22 of partition 23, divide the case into sections.

The operation of the device is as follows.

The cleaned gas enters the pipe 5, which contains a nozzle. The flow accelerated in the nozzle is directed to the disk 10 and flows around it at an angle of 90. At the same time, drops of more than 20 microns precipitate. Then the gas enters the cooled separating elements 9 first

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step 2, where the catch-fO of corrugated grids occurs at 50 rows of grid No. 0.1 (0, xO, 1x0.1 mm). It can be seen from the graphs that with an increase in temperature gradients in the surface layer, the sedimentation rate due to the turbulent 5 inertial effect decreases. This is caused by a decrease in the gas velocity in the near-wall layers and the degree of turbulent pulsations from the temperature range. dienta, as well as increasing the viscosity of the gas. The deposition rate V due to thermophoresis with an increase in the temperature gradient (/ E ;, increases all the time, and most of all with gradients of ecl / (9y more.

Claims (3)

1. A method of separating liquid from hot gases, including turbulent-inertial sedimentation of droplets and condensation of vapors in cooled separating elements, characterized in that, in order to increase the efficiency of gas purification, it is conducted in three stages, with turbulent inertial sedimentation and vapor condensation in the cooled separating element is carried out at the first purification stage, heated to the second scrubbable gas to the initial temperature in heated separators 18, at the cooled separating electric elements 55, and at the third conmentah. The purified gas is removed from the device through the pipe 6, and the captured liquid and water condensate through the pipe 13. The deposition rates of particles due to thermophoresis substantially depend on temperature gradients. Fig. 3 shows the graphs of the rates of droplet deposition due to the turbulent inertial effect (curve 1) and thermophoresis forces (curve 2) on temperature gradients in the near-wall layers of the separating element 20 fO 5 35 thirty 35 40 45 1. A method of separating liquid from hot gases, including turbulent-inertial sedimentation of droplets and condensation of vapors in cooled separating elements, characterized in that, in order to increase the efficiency of gas purification, it is conducted in three stages, with turbulent inertial sedimentation and the vapor condensation in the cooled separating element is carried out at the first purification stage, the second scrubbable gas is heated to the initial temperature in the heated vapor, the vaporized vapor is separated and precipitated non-evaporated, drops d the action of thermophoresis forces in cooled separating elements. 5 13150036 2. The method according to claim 1, about tl n h and a hot-coolant on the second With the thermophoretic - cleaning steps using steam, coke precipitation is carried out at a gradient after the temperature separating element in the sepa-second-layer surface layers is fed to the input of the cleaning elements (2-5) 10 C / m. termo gas third stage 3. The method according to claims 1 and 2, characterized in that as  / T.  Steam condensate FIG. 21 / 5- I tS d a w x chu And and I LU H I I  ten V WITH 9 /BUT sSSISx / TP  H x 12 1Z fO / X zJ - VytoZ. gas go X : hchuchhhchu.  239 FIG. 2 20 20, b 22 j out 2 - 6 dG / dUy S / m fig.Z Compiled by O. Bekker Editor S. Pekar Tehred M. Khodanych - Order 2229/2 Circulation 656 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production printing company, Uzhgorod, Projecto st., 4 Proofreader G. Reshetnik