SU9360A1 - The method of obtaining in one installation of a pair of two different pressures - Google Patents

Description

In order to obtain two different pressures in one installation of the proposed method, an intermediate tank connected between the boiler and the economizer is used, which is under pressure and temperature lower than the pressure and temperature in the economizer. The water, heated in the latter, is supplied to a tank, where, due to a decrease in pressure, it partially evaporates, producing a lower pressure vapor than in. The intermediate tank, which serves as an additional steam space, also serves as an equalization chamber for feedwater. The need for the latter may occur in the case of an enhanced supply of the working boiler, when large amounts of water flow through the preheater, which do not have enough time to warm up.

Consequently, heat, which is not supplied with feed water overheated by the exhaust gases, is used in the tank for additional steam generation, while the tank itself serves simultaneously as a boiler water accumulator. The tank can also be used to accumulate unused B production of steam. Obtaining steam using the proposed method is aimed at achieving a more intense load on the heating surface of the boiler, better utilization of heat from the exhaust gases, as well as an increase in the useful volume of water in the boiler.

In FIG. 1 schematically depicts a vertical section of the installation in which steam is obtained by the proposed method; FIG. 2 is the same, using a modified method.

Between the boiler 1 and the economizer 2.7 (Fig. 1) an intermediate reservoir 3 for feedwater is included, in which the vaporization is caused by an artificial decrease in pressure. The pressure of the feed water supplied through economizer 2.7 to tank 3 corresponds to the highest pressure in the latter, which in turn is lower than the operating pressure in boiler 1. At the time of vaporization in tank 3, the pressure drops, but remains all the time below the feed water pressure in the heater. A portion of the feed water entering the tank 3, due to the lower pressure, is subject to constant evaporation. The feed pump 4 supplies heated feed water through conduit 6 and injects it in the opposite direction of the gases through economizer 2, 7 and high pressure pipeline 8. Then, the feed water under the highest pressure of reservoir 3 or under even higher pressure enters tank 3. Formed in the latter, due to a drop in pressure, steam can be diverted through conduit 13 to various production targets (for draining, cooking, for use in an intermediate, stage or low stage and laziness of the steam engine or turbine). The control valve 16 that is turned on in the pipeline keeps the pressure in the no-i economizer at a pressure equal to the highest pressure in the intermediate tank 3 or higher; Thus, pressure fluctuations in tank 3 arising from steam removal are not transmitted to economizer 2, 7. Second pump 5 takes water from tank 3 and pumps it, as usual, through pipeline to boiler 1. If desired, it can be passed through tank 3 only part of the feedwater contained in the economizer 2 sent the remainder directly to the boiler.

The removal of a certain amount of steam through the pipe 13 causes a pressure drop in the tank 3, and part of the water contained in it is converted into steam, due to the fact that part of the heat of the liquid is released and transferred into the heat of vaporization. If the pressure in the tank 3 is constantly maintained lower than that in the pipe 12, the feed water to the tank 3 will evaporate. Installation mode may

for example, Dac, that pressure fluctuations in reservoir 3 occur between five atmospheres and one atmosphere, with a decrease in pressure by four atmospheres causing the required amount of water to become vaporized. If tank 3 is made large enough, it can serve as a heat accumulator and gives, if necessary, the right amount of steam. With less steam flow from the tank 3, the pressure and temperature in it increase to a selected maximum, and the tank is again ready for operation. Constant steam consumption from reservoir 3 is also possible, provided that the pressure in it is kept lower than in pipeline 8.

In order to accelerate the heating of the water cooled by steam generation in tank 3, water can be re-run through economizer 2, 7. You can also connect a second economizer to the latter; 17 (Fig. 2), equipped with a pressure pump 18 and connected to tank 3 by pipes 19 and 20. Economizers 2, 7 and 17 are separated by valve 21. Thus, water from the tank is run through economizer 17 and, making a full circle, is heated . Heating of the tank 3 water can be done differently, running it through the boiler, and the economizer 17 is superfluous (dotted image in Fig. 2), and the water runs through; by means of the pump 5 through the circulation network 10, 22,, 20, 8. In this case, a reduction valve 24 of conventional construction is installed in line 22.

If you choose the power of pump 5 somewhat more than the work required to power the boiler, you can do without using pump 18 and pipeline 19, and then the excess water supplied to the boiler enters through pipe 22 through valve 24 back to tank 3. The same goal can be achieved using the warmth of the radar when passing through the throttle valve of the worker

couple. In order to keep the boiler load constant at low steam flow rates and to avoid losses associated with steam output through safety valves, boiler 1 is connected to reservoir 3. using pipe 11, 12, on which automatic valve 25 is installed, replacing safety valve and opening at a pressure slightly lower than the maximum pressure of the boiler. The excess vapor pressure is higher than normal by opening the valve 25, flows through pipe 1Л, 12 to tank 3, where it gives off its heat to the water, the pressure in it increases, and the temperature in tank 3.

The latter, in order to avoid heat loss, can be insulated with an IET-conductive material. It can also be heated if, for example, low-pressure boilers are used in the form of tanks 3. Heating can also be carried out with plant flue gases.

The subject of the patent.

1. A method for producing a pair of two different pressures in one installation, characterized in that

lower pressure steam is removed from the intermediate-between the boiler and the economizer 2, 7 (Fig. 1) of the tank 3, which is under pressure and temperature lower than the pressure and temperature in the economizer 2, 7, and heated water from the same tank , using pump 5, is used to power the boiler at a higher pressure.

2. Alteration of the steam generation method described in paragraph 1, characterized in that tank 3 to increase its steam output, besides heat from economizer 2, 7, is supplied with additional heat using an economizer-heater 17 (Fig. 2) connected to tank 3 circulating network 19, 20, 8 with a pump 18.

3. Variation of the method described in paragraph 1, characterized in that the tank 3 is supplied with additional heat from the boiler 1 by pumping water from the boiler 1 to the tank 3 by the action of the pump 5 and the circulation network 10, 22, 20, 8 or by feeding into tank 3 of excess steam from boiler 1 through pipe 11, 12, in which case tank 3 serves as a battery.

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