Obligation run boiler

The invention refers to a Zwangdurehlaufkessel, which exhibits the superheater an upstream water vapour separation container with a container to the Anund driving off as well as to the enterprise with part-load, in which a water level is formed. This container is attached to a circulation pump. The invention is the basis the task to create a perfect water level regulation despite long vorgeschaketen continuous system and to avoid a special measurement of volume in the rolling over line. The invention consists of that with a such boiler the water level is regular in the Behälmr by means of a valve behind the pump in the rolling over line, and that the rolling over line before the main quantity orifice plate is led back into the feeder. Actually a Durehlaufkessel with circulating system is already become known, with which in the rolling over line behind the circulation pump a valve is intended. This valve does not serve the regulation of the water level, sondem made possible only a Abtrennnng of the rolling over line in the full load enterprise with the well-known plant however in front main branch of the medium. In contrast to this it acts with the obligation run boiler after the invention around a Regeiventil as part of a Wasserstandsmgelung in that the water vapour separation container naehgesehalteten itself containers. In addition wi D the variable rolling over quantity of water along that by the Speisewasserpumpe course trips main food quantity before the main quantity orifice plate united, SE that these together dazzled the sum of rolling over water and feed water seizes. In order to facilitate the regulation from rolling over quantity and main food quantity to, further the Hauptspeiseregelveutil or the regulating valve arranged in the rolling over line or both regulating valves a Bypaßmgelventil can be parallel switched in each case. In this way a more accurate dosage of the Durehflusses lets itself obtain. For the enterprise of a Zwangdurchlau essels after the invention it can be proceeded in such a way that in the partial load operation or with the Anund driving off the feed water supply in the sense is regulated that itself the total quantity to a given value, in particular about 40% the Vo, building up from feed water and rolling over water! read-mixes, one keeps constant. Thus does not come also with smallest achievement of the boiler of about 10% of the full boiler load of the feed water volumeters from his measuring range. On the basis the design the invention is to be described more near. The figure shows a remark example in its parts substantial for the invention in simplified schematiseher representation. The medium is promoted by the feed pump 1 to the high pressure preheater heating surfaces 2, how the Speisewasserpumpe! a feed water regulating valve 8 is naehgesehaltet. The heating surfaces 4 and 5 are within the boiler, whereby in the tubing system 5 those calibrates own evaporation takes place. The superheater Heizfläehen is marked with 6 and 7. Between evaporators and superheaters a water vapour separation container 8 is switched, a container 9 is assigned to which, in which see a water level trains, lm range of the water level branches the rolling over line! 0 off. Behind the circulation pump!! the print page of the rolling over line before the main quantity orifice plate 25 into the main feed water stream 13 flows. The line 12 contains directly behind the pump [...] a Venti! 21, with which the water level in the container 9 is regulated, like the interlocking 92 symbol light. Thereby that the rolling over line! einmilndet, the total quantity building up from feed water and rolling over water lets itself 2 before the main quantity orifice plate 25 into the feeder 13 determine itself by the orifice plate 20. Like the interlocking 26 symbol light, is the automatic controller 27 fttt the feed water supply by the total quantity measurement influenceable and steers via the interlocking 28 the boiler pump i and/or the feed water regulating valve 3. ! 0 a host not represented more near in the design affects a main automatic controller 99, which affects the Speisewasserrregler 27 again over the interlocking 30. The automatic controller 97 works in such a way that a total river arriving over the orifice plate 25 is kept constant by feed water and rolling over water to a selectable value. With partial load operation and/or when starting this value can be for example with 40% of the full load enterprise. Additionally to the water level regulation in the container 9 over the interlocking 22 still another expiration of emergency is with the help of the valve 23 over the interlocking 24 intended. Further can also over the interlocking 3! additionally to the signal a signal given over the interlocking 9,6 on the automatic controller 27 to be given, over gegebenenfa! to reduce LS the Wasserzufuhr further. Since the feed water regulating valve 3 and likewise the valve 21 for full throughput, in the rolling over line, are dimemioniert, and devoted in the case of this interpretation already small adjustment movements at the valve groove throughput quantity alterations, it can be of advantage in each case to arrange parallel to the main feeder gel valve 8 and parallel to the regulating valve 21 a smaller bypass regulating valve 38 and/or 39 in order to obtain thereby a more accurate dosage of the flow. For the temperature control of steam withdrawing over the Frisehdampfleitung 39 are Wasser9.5 inject-place 33 and 34 with appropriate Einspritzventilen 35 and 36 intended. The injection line 37 is thereby before the main quantity orifice plate 25 of the feeder! 3 branched.