SU39375A1 - Adaptation to steam heat exchangers for the release of air evolving during steam condensation - Google Patents

Description

In steam heat exchangers, the air released during condensation of steam very significantly reduces heat transfer. For the purpose of timely automatic removal of the air released from the vapor, the heat exchanging device is supplied with an exhaust valve connected to the core of an electromagnet, the circuit of which closes when the contacts interact. One of these contacts is mounted on the arrow of the Bourdon manometer connected to the cavity of the device, and the second on the insulated arrow of a millivoltmeter freely attached to the axis of the manometer and connected to a thermocouple placed inside the device.

In the schematic drawing of FIG. 1 is a side view of the tool; and FIG. 2 - a part view, its front.

The device is intended to remove air from the steam consumer (heat exchanger), which degrades the steam return of its heat to the walls of the device. It has been established by experiment that the release of air released by the condensation of steam in a heat exchanging appliance accelerates, for example, the cooking process in cooking boilers about three times. Manual release of air does not give the proper effect and is accompanied by

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besides, partial release of steam. Designed for automatic air release, the proposed device is built on the basis of a regular relationship (Dalton's law) between pressure and temperature of steam and deviations from this dependence when there is air in a saturated steam. During heat transfer to the walls of the device, the vapor condenses with the release of air, as a result of which the temperature of the vapor decreases and its partial pressure drops, and at the same time a partial pressure of air occurs. Thus, the pressure gauge attached to the instrument, indicating the sum of the partial pressures of gases in the instrument, makes it impossible to judge the temperature, which is actually lower than the temperature corresponding to the pressure gauge readings for saturated steam. In addition, the air, filling up more and more of the vapor space, impedes steam operation.

The device consists of a Bourdon manometric tube 1, connected by a leash 3 with arrow 2, and a thermometer in the form of a thermocouple 4 with a millivoltmeter 5 driving the cortex 6 of arrow 7. Arrow 7 is on the same axis with arrow 2, but is electrically insulated with dielectric coupling 8 The tube 10 and the conductors 7 / from the thermocouple come out of the vapor space 9. The steam entering the heat exchanger through the opening 12 creates pressure and temperature, which are indicated by arrows. The arrows 2 and 7 strengthen the contacts included in the circuit consisting of the wires 13 of the current driver (battery) 14 and the electromagnet 15, the measles of which are connected to the air outlet valve 17 of the device. When the contacts of arrows 2 and 7 come off and the circuit closes, the electromagnet’s bark 16 is injected into the coil and opens valve 77. Since the valve is in the lower part of the vapor space where air is accumulated, when the valve opens, the air will be pushed out .i

The air released from the vapor during condensation of the latter creates pressure (the sum of the partial pressures of steam and air), but does not change the temperature of the steam, which in turn has a temperature corresponding to the pressure created only by it. Thus, depending on the amount of air in the heating steam, there will be a difference between the pressure and the temperature of the device. In case there is no air in the steam, the pressure corresponds to the temperature of the vapor space. Assuming that the pressure in the instrument is 1 atmosphere, the gauge needle shows 1 atmosphere on a scale of 18, and the needle of a millivoltmeter 5 indicates the corresponding (1 atmosphere) temperature of 20 ° on a scale of 7P, and the contacts of both arrows are at some distance from each other . As the vapor condenses, air begins to fall out of it and create pressure. Since the total pressure (the sum of the partial pressures) remains invariably equal to 1 atmosphere, the temperature drops, and the millivoltmeter needle

will fall when touching the contact of the gauge needle, as a result of which the circuit closes, and KJAopan 77 will open the air outlet. But kzk only air will come out, then the pressure will guess. and the arrows are separated, and the valve is closed by pressure in the vapor space. Thus, any difference between pressure and temperature over the entire length of both scales will be accompanied by the opening of the valve and the release of air.

The subject matter of the invention.

Adaptation to steam heat exchangers for the release of air released during steam condensation, characterized by the use of an exhaust valve / 7 placed in the lower part of the device, connected to an electromagnet core / 5 connected to an electrical circuit, closed by means of interacting contacts, one of which is fixed on the arrow of the Bourdon manometer connected with the tube W with the cavity of the heat exchanging device, and the second on the arrow of the millivolt meter 5, which is freely attached to the axis of the manometer and insulated by a dielectric, UNITY to the thermocouple 4, introduced in teploobmeiny device.

" /- Yes