Steam Generator

Abstract

A steam generator has a pressure casing formed in the shape of a drum. The longitudinal axis of this pressure casing is oriented horizontally or largely horizontally. A hollow tube (1) is formed in such a way that at least two hollow tube sections (1′) are provided, preferably a plurality of hollow tube sections which extend predominantly parallel to each other, and which are arranged in stack-form vertically or vertically offset above each other, and which in each case are interconnected in pairs at an end section, wherein this hollow tube is located in the vertical direction above the feed section (8).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is exemplarily described below, based on exemplary embodiments with reference to the drawing, without limitation of the general inventive idea. In the drawing:

FIG. 1 shows a schematized longitudinal cross section through a boiler casing which is formed according to the solution,

FIGS. 1A, B show cross-sectional views through a boiler casing with hollow tube arrangement,

FIG. 2 shows a view of the hollow tube arrangement of an OTC cooling system known per se,

FIG. 3 shows a schematized cross-sectional view of an alternative exemplary embodiment, and

FIG. 4 shows a schematized longitudinal partial cross section through a boiler casing.

Claims

1. A steam generator comprising: a pressure-tight pressure casing enclosing a volume;at least one hollow tube extending in the casing volume, the at least one hollow tube being hermetically sealed from the casing volume;a feed section and a discharge section which fluidtightly project through the pressure casing, the at least one hollow tube fluidly connected to the feed section and to the discharge section;wherein the pressure casing includes at least one opening for feed of heat flow into the volume, and at least one opening for outlet of heat flow, configured and arranged so that heat thermally interacts with the at least one hollow tube;wherein the pressure casing is drum shaped and has a longitudinal axis and a diameter perpendicular to the pressure casing longitudinal axis;wherein the pressure casing longitudinal axis is oriented horizontally, and the pressure casing along the longitudinal axis is larger than along the pressure casing diameter;wherein the at least one hollow tube is configured and arranged to provide at least two hollow tube sections which extend parallel to each other and which are stacked vertically or vertically offset above each other, and are each interconnected in pairs at an end section;wherein the discharge section is arranged in the vertical direction above the feed section; andwherein the at least one opening for feed of heat flow is located in a vertically upper section of the pressure casing, such that heat flow inside the pressure casing occurs over the hollow tube sections transversely to their longitudinal extent, with a flow direction which is oriented from the top vertically downwards.

2. The steam generator as claimed in claim 1, wherein the pressure casing has a round, oval, or polygonal cross section.

3. The steam generator as claimed in claim 1, wherein the at least one opening for feed of heat flow into the volume and the at least one opening for outlet of heat flow are configured and arranged so that the heat flow flows unidirectionally over the hollow tube sections in the way of a once-through flow-over.

4. The steam generator as claimed in claim 1, wherein the at least one hollow tube comprises a plurality of hollow tube sections interconnected in a meander form to form a vertical stack, each hollow tube section extending parallel to each other.

5. The steam generator as claimed in claim 4, wherein the plurality of hollow tube sections are horizontally arranged inside the pressure casing.

6. The steam generator as claimed in claim 4, wherein the plurality of hollow tube sections are oriented parallel or perpendicularly to the pressure casing longitudinal axis.

7. The steam generator as claimed in claim 1, wherein the at least one hollow tubes comprises a plurality of individual hollow tubes, the individual hollow tubes each arranged next to each other in the hollow tube sections and forming a hollow tube arrangement, hollow tube sections which lie directly next to each other being arranged vertically offset from each other.

8. The steam generator as claimed in claim 7, further comprising: at least one support structure;wherein the hollow tubes of the hollow tube arrangement are fixed by the at least one support structure; andwherein the at least one support structure encompasses all the hollow tubes along a plane which orthogonally intersects the longitudinal axis.

9. The steam generator as claimed in claim 8, wherein the at least one support structure comprises a plurality of individual holding devices with recesses which are adapted to an external contour of the hollow tube sections of the individual hollow tubes; and wherein the plurality of individual holding devices with the hollow tube sections each positioned in the recesses, are configured and arranged to be stacked together.

10. The steam generator as claimed in claim 8, further comprising: a plurality of support structures positioned along the hollow tube arrangement, the plurality of support structures spaced apart along the longitudinal axis.

11. The steam generator as claimed in claim 1, wherein the at least one hollow tube comprises a finned pipe.

12. The steam generator as claimed in claim 1, wherein the pressure casing comprises an inner wall, and further comprising: support rails connecting the at least one hollow tube to the pressure casing inner wall.

13. The steam generator as claimed in claim 1, wherein the at least one opening for outlet of heat flow is located in a lower section of the pressure casing so that heat flow flows unidirectionally through the pressure casing volume and perpendicularly to the pressure casing longitudinal axis.

14. The steam generator as claimed in claim 1, wherein the at least one opening for outlet of heat flow is located in an upper section of the pressure casing, and further comprising: means for conducting the heat flow inside the pressure casing which heat flow conducting means downwardly guides the heat flow which enters through the feed opening, such that the heat flow thermally engages the at least one hollow tube; andwherein the heat flow conducting means is also for deflecting the heat flow inside the pressure casing so that the heat flow flows upwards close to the inner wall of the pressure casing, is separated from the at least one hollow tube by the heat flow conducting means, and emerges at the top from the pressure casing through the at least one opening.

15. A method of using a steam generator as a cooler unit of a gas turbine plant, the plant having a gas turbine, with a steam-operated unit, the method comprising: providing a steam generator as claimed in claim 1 fluidly between the gas turbine plant and the steam operated unit;cooling at least partially expanded air of the gas turbine with the steam generator; andconducting steam from the steam generator to the steam-operated unit.

16. The method as claimed in claim 15, operating the steam generator as a once-through cooler, including flowing the at least partially expanded air against the at least one hollow tube, and guiding an evaporable fluid through the at least one hollow tube.

17. The method as claimed in claim 15, further comprising: positioning the pressure casing directly next to the gas turbine with the pressure casing longitudinal axis oriented horizontally.

18. The method as claimed in claim 16, wherein guiding an evaporable fluid comprises guiding water.