RU2262038C2 - Steam generator - Google Patents

Abstract

FIELD: electrode-type steam generators at boiler volume of 25 l not to be subjected to obligatory registration in Boiler Inspection agencies; generation of process steam of low and mean pressures; light, food-processing and other industries.

SUBSTANCE: boiler electrodes are made in form of rectangular loops including the current conductor located on upper shorter side of loop; opposite longer sides are interconnected by couplings located at equal distances relative to one another; boiler is additionally provided with feed reservoir installed near electrode boiler and is connected with it by steam and water lines; it is provided with heating unit in upper part. Feed reservoir makes it possible to increase water and steam volume of steam generator without impairing the Boiler Inspection standards at smooth and stable operation of electric starting equipment.

EFFECT: enhanced efficiency and reliability; increased generation of steam.

2 dwg

Description

The invention relates to electrode steam generators with a boiler volume of up to 25 liters, which are not subject to mandatory registration with the Kotlonadzor authorities, designed to generate technological steam of low and medium pressures, the high steam productivity of which is in demand in enterprises of light, food and other industries.

Known electrode boiler (steam generator) (patent RU No. 2013687 C1, class F 22 B 1/30, USSR author's certificate No. 1502899, class F 22 B 1/30 1989) containing an electrode boiler in the cavity of which is located and a central electrode with a current lead, made in the form of a rod having a height equal to the total height of the horizontal electrodes, and located in the holes of the latter, made in their central part.

The disadvantages of the known electrode boiler include structurally complex execution of the electrode block, as well as its low steam capacity, due to its operation on a single-phase current.

The objective of the invention is:

1) increasing the heating efficiency of the electrode boiler and increasing steam production due to the proposed design of the electrodes;

2) creating the possibility of selective, controlled increase in the temperature of the working steam;

3) increasing the reliability and stability of the electric launch equipment by increasing the water-vapor volume.

So, when testing a prototype of a steam generator with high efficiency of heating the electrode boiler due to the proposed design of the electrodes and increasing the steam productivity by four to five times relative to serial samples of steam generators, due to the small volumes of the electrode boiler, frequent, unstable switching on and off of power electric starters and the pump unit was observed. The above drawback is completely eliminated by applying the technical solutions claimed by the authors.

Fulfillment of the tasks is achieved in a steam generator containing a vertically positioned electrode boiler, in the cavity of which there is a capacitance and a central electrode with a current lead, made in the form of a rod having a height equal to the total height of the horizontal electrodes, and located in the holes of the latter made in their central part. The electrodes of the boiler are made in the form of a closed rectangular contour, the opposite long sides of which are connected by bonds located at an equal distance from each other, in addition, the electrode boiler is equipped with a device in the form of a vertically located container connected to the electrode boiler by water and a pair divided in its middle parts with a perforated partition, and electric heaters are installed in the upper part of the tank, the electrode boiler of the steam generator is equipped with three electrodes with increased efficiency in the form of heating, having the shape of a rectangular contour, the opposite long sides of which are interconnected by bonds located at an equal distance from each other.

Figure 1 shows an electrode with increased heating efficiency due to the large area of the rectangular contour, consisting of a current lead 1 located on the upper short 2 side of the rectangular contour, and two long 3 sides of the contour, interconnected by bonds located at an equal distance from each other .

Figure 2 shows a General view of the steam generator in section with a vertically arranged electrode boiler 5 having a heat-insulating coating 6.

In the upper part of the electrode boiler 5, three current leads 1 are vertically fixed on the flange 7 with electrodes 8 fixed to them, which for electrical safety are located with a certain gap inside the hollow cylindrical anti-electrode 9. The electrode boiler 5 also contains a gauge glass 10 having a scale with upper marks To "and the lower" N "water levels, as well as the nutrient tank 12 connected to the electrode boiler 5 by pipelines 11, divided in the middle by a perforated partition 13, and with blocks located in its upper part s steam heating (heating elements) 14.

The steam generator also includes an electric pump unit 15, steam supply valves 16 and 17, a safety valve 18, a pressure switch 19, a pressure gauge 20, valves 21 and 22 for supplying and discharging water.

 The electrode steam generator operates as follows.

When the steam generator is turned on in the three-phase current network and the water supply valve 21 is opened in the electrode boiler 5, the electric pump unit 15 is turned on and the water of the main water supply fills the electrode boiler 5 to the upper mark “K” of the scale of the water meter glass 10 and at the same time the water fills connected to electrode boiler 5 pipelines 11 the feed tank 12, after which the sensors of the upper water level "K" turn off the electric pump unit 15 and the process of vaporization and steam supply to the consumer occurs open valve flow steam 16 and a closed valve overheating steam 17.

As the steam is consumed, the vapor pressure in the electrode boiler 5 and the connected feed tank 12 simultaneously slowly and smoothly drops, thereby reducing the frequency of operation of the electric starter equipment and, in particular, the contacts of the power electric starters, after which the lower water sensors "N" turn on the electric pump unit 15 and the above process is repeated.

In the case when the consumer needs a high temperature of the process steam, all or part of the steam superheat blocks 14 (heating elements) located in the upper part of the feeder 12 are turned on. At the same time, the steam flow valve 16 of the electrode boiler 5 closes and the valve 17 of the superheated steam of the feeder opens 12. In this case, the consumer will receive process steam of high temperatures.

Claims (1)

A steam generator comprising a vertically positioned electrode boiler, in the cavity of which there is a container and a central electrode with a current lead, made in the form of a rod having a height equal to the total height of the horizontal electrodes and located in the holes of the latter made in their central part, characterized in that the electrodes the boiler is made in the form of a closed rectangular contour, the opposite long sides of which are interconnected by bonds located at an equal distance from each other, itelno electrode boiler provided with a device in the form of a vertically arranged vessel connected to the electrode of the boiler water and steam, divided in its middle portion of the perforated baffle and the upper portion of the container fitted heaters.

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