SU1208406A1 - Steam generating plant - Google Patents

Description

The invention relates to energy and can be used to create solar-fuel power plants.

The purpose of the invention is to increase the steam generating capacity of a steam generating plant by heating water supplied to the solar boiler and more efficient use of solar energy.

On -fig. depicts a steam generating installation, a variant (the heating of additional chambers; the combustion processes are included in the natural circulation circuit of the heated medium); in fig. 2 - the same, option (the surfaces of the heating of the additional chamber of combustion are included in the continuous circuit of the heated medium).

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The steam generating installation contains a fuel boiler with economizer 1 and evaporator 2, connected in series to the path of the heated medium through the drum 3, and a solar boiler with evaporator 4, which is connected to the path of the heated fuel boiler path between its economizer 1 and the evaporator 2. The fuel the boiler is also provided with a primary steam superheater 5 connected to a high-pressure, turbine cylinder 6, and a secondary superheater 7 connected to a medium-pressure cylinder 8. The high-pressure turbine cylinder 6 is connected to a steam boiler superheater 9 connected to an evaporator 4 of this boiler through drum 10. The evaporator 2 is placed in the furnace 11 of the fuel boiler equipped with burner 12, and the convective shaft 13 of the fuel boiler is made with a combustion chamber 14, equipped with burners 15 and a shielded wall heating surface 16 included in the path of the fuel environment being heated or with the formation of an additional natural circulation circuit with a drum 17 and lowering pipes 18 (Fig. 1), or along the straight lines otocast scheme (figure 2). In the second case, the chamber 14 can be additionally shielded by an adjustment wall heating surface 1 9 incorporated in the fuel boiler environment track between the primary steam superheater 5 and the high-pressure cylinder 6 of the turbine. The heating surface 19 may

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also be included in the path of the heated medium between the high and medium pressure cylinders 6 and 8, i.e. can be used to heat the secondary steam. The fuel boiler is also equipped with an air heater (not shown) connected to burners 12 and 15, and the turbine regeneration system has a heat exchanger (not shown) connected to the air heater of the fuel boiler.

The steam generating plant operates as follows.

In the absence of solar radiation, the solar boiler is turned off, fuel is supplied only to burners 12 (fuel is not supplied to burners 15). Feed water is heated in economizer 1 and heated to drum 3. Boiler water in evaporator 2 evaporates, and the resulting steam is superheated first in primary steam superheater 5, and then after passing through cylinder 6 of the turbine and in secondary steam superheater 7. Fuel consumption in burner 12, corresponds to the flow rate of the primary and secondary vapors, with the result that the superheat temperatures of the primary and secondary vapors are kept constant.

In the presence of solar radiation, the economizer 1 of the fuel boiler is supplied with feed water at a rate equal to the total steam capacity of the solar and fuel boilers.

1 After the economizer. The feed water is divided into two streams. One

The feedwater flow is directed B of the drum 10 of the solar boiler, and the other into the drum 3 of the fuel boiler. Before splitting the feed water into two streams, part of the feed water is directed to the wall 6 of the heating of the combustion chamber 14, and the fuel is supplied both to the burners 12 and to the burners 15. The load of the solar boiler is maintained as far as possible by the condition of available solar radiation the load of the fuel boiler is set equal to the difference between the required load of the turbine and the available load of the solar boiler. In the first embodiment of the steam generating plant (Fig. 1), the steam obtained in the surface 16 is directed through the drum 17 to the primary steam superheaters 5, and

In the second variant of the steam generating plant (Fig. 2), surface 16 serves to add additional heating of feed water, and in the heating surface 19, the steam, HanpaBjiHeNrbM from the superheater 5 into the cylinder 6 of the turbine, which also direct the steam from the solar heater 9 to the boiler.

Supply of additional fuel in the burner 15 of the combustion chamber 14 pos 208A064

It is necessary to ensure the nominal superheat of the secondary steam supplied to the cylinder 8 of the turbine. In the second variant of the steam generating plant (Fig. 2) 5, additional steam overheating in the heating surface 19 allows the nominal temperature of the primary steam to be maintained over the entire load range of the steam generating device of the plant 10 when the fuel and solar boilers work together.

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Claims (1)

STEAM-GENERATING INSTALLATION, comprising a fuel boiler with an economizer and an evaporator, connected in series to the path of the heated medium, and a solar boiler with an evaporator, characterized in that, in order to increase steam production, the evaporator of the solar boiler is connected inlet to the path of the heated medium of the fuel boiler between its economizer and vaporizer. 1208406, 2