SU1231313A1 - Restrictor of steam-generating pipe - Google Patents

Description

This invention relates to power engineering and can be used in continuous steam generators.

The aim of the invention is to increase the operational reliability of the throttle device of the steam generating pipe by reducing the likelihood of clogging of the nozzle by optimizing the shape and size of its passage section.

FIG. 1 shows the throttle device of the steam generating tube, general view; in fig. 2 is a view A of FIG. one.

The throttle device of the steam generating pipe contains a hydraulic nozzle 1, made with larger and smaller flow rates for the forward and reverse currents of the heated medium, respectively, installed in the inlet section of the steam generating pipe 2 and having inlet and outlet sections 3 and 4, respectively. The inlet section 3 of the nozzle 1 is made with a round section through passage, and the exit section 4 with a through section equal to the through section of its input section 3 and having the shape of a rectangle.

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the length of which exceeds the inner diameter of the inlet slice 3 nozzle 1.

The throttle device operates as follows.

The feed water through the nozzle 1 enters the economizer zone of the steam generating pipe 2, evaporates in it and goes off to the consumer in the form of steam. Due to the fact that the nozzle 1 has a lower flow rate for return flow, a sufficiently high resistance for reverse flow is created water from pipe 2, preventing the occurrence of inter-turn pulsations. At the same time, a smaller discharge coefficient for reverse flow in nozzle 1 is provided by constructive execution of its input section 3 of circular section, and output section 4 - equal to it in the area of rectangular section, the long side of which is larger than the internal diameter of circular section of section 3. Equality of the areas of these sections allows It is impossible to exclude the likelihood of corrosion of the nozzle 1 in the feed water, which increases the operational reliability of the throttle device of the steam generating pipe 2.

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Claims (1)

A THROTTLE DEVICE FOR A STEAM-GENERATING PIPE containing a hydraulic nozzle made with higher and lower flow coefficients, respectively, for the forward and reverse currents of the heated medium, installed in the inlet section of the steam-generating pipe and having inlet and outlet sections, the first of which is made with a circular cross-section, different the fact that, in order to increase operational reliability by reducing the likelihood of clogging of the nozzle, the output section of the latter is made with a passage section equal to the passage section of its inlet section and having the shape of a rectangle, the long side of which exceeds the inner diameter of the inlet section of the nozzle. Q <0 Figure 1 SU „1231313> the long side of which exceeds the inner diameter of the inlet slice 3 nozzle 1. The throttle device operates as follows. ₅ Feed water through nozzles 1 enters the economizer zone of the steam generating pipe 2, evaporates in it and leaves to consumers in the form of steam. Due to the fact that the nozzle 1 has a smaller coefficient of expiration for reverse flow, cos ¹⁰ is given a sufficiently high resistance to back flow from tube 2, prevents interturn pulsations. At the same time, a smaller coefficient of outflow for backflow into the nozzle _{) 5} ke 1 is ensured by the constructive implementation of its input slice 3 of circular cross section, and the output slice 4 - equal to it in rectangular area, the long side of which is larger than the inner diameter of the circular cross section of slice 3. Equal areas of the indicated cross-sections allows you to eliminate the likelihood of clogging of the nozzle 1 with corrosion products in feed * · water, which increases the operational reliability of the throttle device of the steam generating pipe 2.