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Throttling component used for once-through steam generator

A technology of steam generator and throttling components, which is applied to the components of steam boilers, steam generation, steam boiler accessories, etc., can solve problems such as complex structure, and achieve the effect of simple structure and easy loading and unloading.

Active Publication Date: 2014-06-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure is very complicated, especially for steam generators with a large number of heat exchange tubes, it is difficult to adopt this structure

Method used

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  • Throttling component used for once-through steam generator
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] figure 1 It shows the first embodiment, a schematic diagram of a throttling assembly for a steam generator, which is arranged at the inlet end of the heat exchange tube of the steam generator, and is composed of two parts of the throttling assembly, which are high-strength and wear-resistant materials, wherein the first part of the throttling assembly 100 is a 2-stage throttling orifice (or a more-stage structure), and the second partial throttling assembly 200 is detachable, but the pressure drop is not adjustable. Referring to the figure, the throttling assembly of this embodiment mainly includes the following parts:

[0029] The first part of the throttling assembly 100 plays the role of limiting the flow in case of a broken pipe accident; this part of the throttling assembly is composed of a throttling orifice, and its throttling damping is a fixed value, and the fixed value is set as a stable damping; the stable damping refers to the damping that needs to be intro...

Embodiment 2

[0042] The components of this embodiment are basically the same as those of Embodiment 1. The only difference from Embodiment 1 is that the damping value of the second part of the throttling assembly 200 (the reference number is also 4) can be adjusted according to the actual situation, increasing the throttling Adaptability of stream components. This is also the preferred implementation mode. After plugging the tubes in this way, each heat exchange tube can be adjusted according to the actual situation of the evaporator heat exchange tubes, for example, including various factors such as manufacturing deviations such as tube inner diameters, diameter deviations of spiral tubes, and installation deviations. The pressure drop of the heat pipes is precisely adjusted to keep the temperature of the steam outlet of each heat exchange tube consistent, which is better than that of the first embodiment.

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Abstract

The invention discloses a throttling component used for a once-through steam generator. The whole throttling component is composed of two parts. The first part is a fixed damping type throttling component which is used for preventing the occurrence of steam-liquid unstable flowing of flowing media inside a heat exchange tube, and a single-stage or multi-stage throttling orifice is arranged according to the relation between the inner diameter of the heat exchange tube and the whole throttling pressure drop. The second part is an extra throttling piece which is mainly used for flow adjusting when the heat exchange tube is blocked, and the extra throttling piece can be removed or the throttling damping is adjustable. The throttling component used for the once-through steam generator is simple in structure and can be installed at the tube end of the heat exchange tube of the steam generator conveniently. When the heat exchange tube breaks, the throttling component can throttle well to prevent the accident from expanding. When the heat exchange tube is blocked, the flow adjustment of the media in the heat exchange tube can be realized conveniently, the installation and test of the throttling component of the steam generator can be greatly simplified, and safety guarantee can be provided for the accident that the heat exchange tube breaks.

Description

technical field [0001] The invention relates to the technical field of thermal engineering, in particular to a throttling assembly for a once-through steam generator. Background technique [0002] For the thermal cycle system of power generation, in order to improve the power generation efficiency of the whole system, the usual measure is to increase the temperature and pressure of the working medium. Correspondingly, a large number of once-through steam generators have also been designed and manufactured. Especially in the field of nuclear power generation, the steam generator has become a major key equipment. [0003] In the design of the once-through steam generator, in addition to the heat transfer design and structural design, the flow characteristics of the heat transfer medium also need to be considered. In general, the inside of the heat exchange tube is the heated evaporation medium, such as water, etc.; the outside of the tube is the heating medium that provides ...

Claims

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Application Information

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IPC IPC(8): F22B37/00
Inventor 雒晓卫吴馨莘何树延居怀明
Owner TSINGHUA UNIV
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