DE1401370A1 - Flow boiler for steam power plants of very high performance - Google Patents

Description

Flow boilers for steam power plants very great achievement

The invention relates to a straight-through boiler for very large capacities, e.g. over 300 t / h. Boilers of this size have hitherto generally been constructed in such a way that the working equipment on several parallel V'egen with associated feed controls was passed through boiler tube systems. That way you could the otherwise necessary mixing points for the total steam throughput can be avoided.

However, there is a desire to have only one central unit to reduce the control effort, even with boilers of such high capacity

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Provide feed regulation. When trying to find such a To build once-through boilers without central mixing points with a single feed control, the steam temperatures ran Start up and apart in an impermissible manner in the event of partial load. ■

These difficulties are intended to be eliminated by the invention will. The invention consists in that in a once-through boiler very high performance - using a centralized feed control in a single pass system - the top Collector of heating surfaces connected in parallel through pressure equalization dips are connected to each other. The at start-up and at Partial load occurring static pressure differences '/,' earth thereby largely avoided. The pressure equalization lines advantageously connect parallel lines above the Kesoels arranged mixing points for, for example, half or one Quarter of the amount of steam

In this way it is possible to make that very large with boilers Performance to avoid central miscun parts that are no longer feasible and instead a correspondingly larger number in parallel to use arranged smaller mixing points.

The invention is to be explained in more detail with reference to the drawing. Me figures lines execution at games in their for the invention essential parts in greatly simplified, schernatic Depiction.

In Figure 1, only the heating surfaces of the boiler are

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PLA 61/1716 of the evaporator as well as the first and second Uberhitaers

". The work equipment comes under central feed control initially by the economiser, which is not shown in detail and then enters the heating surfaces of the evaporator 3 through the two parallel pipes 1 and 2, which in the case of the ^ * 'jiusführerun ^ öbeispiel has three units 4, 5 and 6. Every this unit consists of two tube groups 7, 8; 9, 10 and 11, 12. Inventive vegetables are from the upper collectors Ί3, 14, 15, 16 and 17, 18 of each unit at least two by pressure, compensation units 19, 20 and 21 connected to one another.

While in the Verdamnferteil the parallel mixing points are provided for half of the throughput with pressure equalization ducts, in the pre-superheater 22 and in the post-superheater 23 a four-fold development of the throughput is possible, with each animal forming upper collectors parallel mixing points that pass through Pressure equalization lines are connected to one another. The upper collectors of the pre-superheater 22, which are labeled 24, 25, 26 and 27, have pressure equalization lines 28, 29, 50 and possibly also 31. In a corresponding manner, the upper collectors 32, 33, 34 and 5 with pressure release lines 36, 37, 38 and 39 are also provided in the end superheater 23. The four superheated steam lines 40, 41, 42 and 43 lead from the upper headers to the turbine.

-iei 'are the exemplary embodiment shown in FIG Mixing tubes between two consecutive parallel tubes - registers illustrated. The preferably perpendicular '

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bx ^v eighth iVsischrohre 44 and 45 are located between the above and below the circular systems 46 and b,; w. 4Ö and 49. bie üruckaungleichsleitungen 50, 5'I -and the lTiischrohre pre-bonding 44 and 45 and further Sege Mi; -chrohre each other.

5 patent claims 2 figures

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Claims (3)

Λ 4 Π1 ^ 7 Π Claims1 ^ · »-» / « 1. once-through boiler for steam power plants with very high output, in particular over 300 t / h, characterized in that using one only for boilers of not so closer Output, e.g. below 300 t / h, common central feed control - the upper Saicaler heating surfaces connected in parallel connected to each other by pressure equalization lines " are. 2. Boiler according to claim 1, characterized in that the pressure equalization lines are connected and guided in such a way that static pressure differences when starting up and in partial load operation are largely avoided. 3. Boiler according to claim 1 or 2, characterized in that that the pressure equalization lines only the overhead mixing points or connect injection coolers for half or a fourth] of the working cylinder throughput. BAD OFiiGlNAL 809805 / ÜUA3 ~ ~~