SU877220A1 - Steam generator conservation method - Google Patents

Description

(54) METHOD OF CONSERVATION OF STEAM GENERATOR

The invention relates to a power system, in particular to methods for preserving drum steam generators.

A known method of preserving a steam generator containing a drum and a steam path, including a superheater with an intermediate heater and steam lines, by supplying steam from an external source to the steam path while maintaining the temperature of the walls of the latter above the saturation temperature in the drum and providing steam flow from its injection point to drum. one.

However, in the period just a steam from an external source is served in the steam line fresh steam. The passage through the steam path (steam lines, intermediate manifolds, steam superheater), the steam is cooled, 15 as a result of which, at the entrance to the steam superheater stages connected to the drum, its temperature is insufficient to prevent condensation in the above steam superheater stages. Furthermore, the method is characterized by the difficulty of providing 20 sufficiently high temperatures at all stages of the superheater and the impossibility of preventing steam from condensing in Helsinki.

The purpose of the invention is to improve the reliability of the conservation of the steam generator.

. To achieve this goal, the steam generator, which contains a drum and a steam path, including a superheater with an intermediate collector and steam lines, is preserved by supplying steam from an external source to the steam path while maintaining the temperature of the latter walls above the saturation temperature in the drum and ensuring steam flow from the point of its entry before the drum, steam is additionally discharged from the steam lines, and its supply is carried out into the intermediate collector of the superheater.

In addition, steam from an external source and its discharge from the steam lines are carried out periodically.

The drawing shows a diagram explaining the implementation of the proposed method.

The steam generator contains a drum I and a steam path including an overheating 2-5 with an intermediate manifold 6. A purge 8 is connected to the steam line 7 of the drum 1 8. The convective package 5 of the superheater is connected to the steam line 9, on. which installed the valve 10 and drainage I. To the intermediate collector of the superheater 6 is connected to the pipeline 12 with a control valve 13 and drainage 14; A pipe 12 connects the steam generator to an external steam source, for example, to an adjacent steam generator. The steam generator drum 1, the steam path, the steam lines and the extraneous steam supply pipe are equipped with temperature and pressure sensors ... The superheater 2 is connected to the drain 19.

The method is carried out as follows.

When the steam generator stops, some time after the fuel supply to the pipeline 12 is disconnected from an external source, the steam is supplied, whose pressure, controlled by sensor 15, is set 1-20 kgf / cm higher than drum 1 by sensor 16. Opening the drainage 14 heat pipe 12. After the temperature of the steam supplied, recorded by sensor 17, reaches the same value as the temperature of the superheater section to which the pipe compressor 12 is connected (this temperature is recorded by sensor 18), dig valve 13 and either drainage 19 or purge 8 (depending on the design of the steam generator) and drainage P.

Steam, a leak in the steam superheater tract, heats it, surrounding lining and gases in gas ducts, thereby reducing the rate of natural cooling of the steam superheater. As a result, it is possible |

one

EXCLUDING the forced pressure drop in the steam generator drum.

It is also possible to periodically steam from an external source. In this case, it is possible to discharge steam through drainage 19 with closed drainage AND and closed purge 8.

Claims (2)

1. A method of preserving a steam generator containing a drum and a steam path, including a superheater with an intermediate manifold and steam lines, by supplying steam from an external source to the steam path while maintaining the wall temperature of the latter above the saturation temperature in the drum and providing steam from the point of its entry to the drum , characterized in that, with In order to improve reliability, steam is additionally discharged from the steam lines, and its supply is carried out in the intermediate collector of the superheater. 2. A method according to claim 1, characterized in that the supply of steam from an external source 5 and its discharge from the steam lines is carried out periodically. Sources of information taken into account during the examination 1. He sustained a cooling of the stopped drum boiler and maintaining it in a hot state. Express information “Thermal Engineering, Moscow,“ VINITI, 1973, No. 40, p. I.