RU1791515C - Method for removing ice crust from surface of structures - Google Patents

Abstract

Using; when cleaning surfaces of structures from ice. SUMMARY OF THE INVENTION: the method comprises irradiating with a stream of light radiation. The surface is covered with a film, and simultaneously after coating the surfaces with a film, they act on the film with light radiation and infrared radiation with a frequency depending on the ice temperature. 3 ill.

Description

The invention relates to methods for clearing ice from frozen hydraulic structures. The purpose of the invention is to reduce time and increase removal efficiency.

Fig. 1 shows a diagram of an apparatus for implementing the method: Fig. 2 is a timing diagram of irradiation; Fig. 3 is a plot of radiation frequency versus temperature. . ::; ; ..... - :: //.ch / U

The installation comprises lamps of a powerful radiation source 1, powered from the mains, and low-power radiation sources 2, located in the housing 3; Low-power sources 2 are connected to a pulse generator 4. The installation also contains a polymer film 5, which covers the ice surface of structure b 7.

The method is carried out as follows. .. -::. The radiation sources 1 and 2.. Located in the housing 3, are supplied with power from the mains and from the generator 4, respectively. Before irradiation, the ice surface is preliminarily coated with a film 5 and simultaneously exposed to the film by light radiation of a powerful source -1 and

pulsed infrared radiation from the source 2. Film 5 has a large spectral transmittance, due to which there is an almost complete passage of the light flux from the radiation sources 1 and 2 through it. Coating the ice surface with a film leads to the heating of ice under the Film and the formation of a water layer between the film 5 and ice 6. The action of infrared sources working in the ice transparency window increases the transmission of heat radiation through it. An ice irradiation diagram is shown in Fig. 2. The basic powerful source 1 operates constantly - the radiation flux M. and the pulsed infrared radiation source - flux No. - operates with a frequency depending on the ice temperature. Moreover, the lower the surface temperature of the ice; all the more, radiation with a high frequency passes (FIG. 3). When ice is irradiated only with a Ni source, the transmitted radiation value is shown in Fig. 2 as N. The result of the combined action of the two radiation sources is shown in FIG. 2 as Ni + N2, i.e. flow through ice. So the combined effect of these

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sources increases the transmission of radiation through the ice, depending on the pulse repetition rate of the infrared radiation source, by 2-7%. After the ice-structure boundary has warmed up, the ice is removed mechanically or in another way. .

As an example, we consider the passage of the radiation flux of a PRU1-212 M searchlight and AL-107 B light-emitting diode through a heated ice surface of a fibrous structure with a fiber cross-section diameter of 10 mm (Fig. 3). The surface ice temperature varied from 0 to -20 ° С. The pulse repetition rate of low-power

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the infrared radiation source varied from 50 Hz to 32 MHz, respectively (Fig. 3 shows up to 5 MHz);

Claims (1)

SUMMARY OF THE INVENTION A method for removing ice from a building surface, comprising irradiating it with a stream of light, characterized in that, in order to reduce time and increase removal efficiency, the surface is covered with a film and, after coating the surface with a film, the film is exposed to light and infrared radiation frequency, the value of which corresponds to the temperature of ice and increases with decreasing temperature.  m sss srs sss sss sss sss sss sss s / s sss No. # m Figure 2 5 6 well figure 1 se / g ABOUT -U .- / 5 -20 t ° C 0U2.3