Ability is very necessary.
The relationship between the additional thrust and the displacement of the condenser interface 1 The commonly used circulating water pipeline compensation method In order to solve the problem of insufficient compensation ability of the circulating water pipeline, the general method is to add a double wave compensator to the condenser on the circulating water pipe riser to absorb the condenser. Interface displacement can have a certain effect. The layout is as shown in (a). The scheme is simple and convenient to arrange and solves the compensation problem. However, due to the large axial thrust of the bellows under the action of the internal pressure of the medium, the thrust on the 300 MW unit can be up to 980 kN, and the additional force on the condenser interface is greater than that without the bellows compensator. Conducive to the safe operation of the unit. At the same time, the pipe system will also produce corresponding load on the support at 1 o'clock, which needs to be treated as a foundation, and the construction cost of the civil structure is added.
In addition to the above compensation methods, it is also often used to provide tensioning devices on both sides of the double wave compensator, such as (b). After analysis, the tensioning device can only function in one of the cold state or the hot state, while in other states, the tensioning device does not work, and the huge axial thrust generated by the compensator still exists. Can't really solve the problem.
2 New Circulating Water Pipe Compensation Mode The bellows compensates for the axial thrust generated by the internal pressure of the medium. It is mainly related to the peak cross-sectional area and the medium pressure, but it is generally not related to the pipe arrangement. To reduce the influence of the axial thrust on the piping system, only the internal balancing method is adopted, that is, the axial thrust is balanced by changing the internal structure of the compensator so as not to act on the outside. After the analysis and calculation of the circulating water pipe system of the power plant condenser, the following two new compensation methods are obtained, which effectively solve the above problems.
2.1 The first method is to use the hinged rod or hinge to join the two sides of the bellows and to withstand the axial thrust through the tie rod. Generally, a so-called double-link type bellows compensator is formed by adding two straight tubes in the middle of two sets of bellows. With this structure, the line displacement of the riser portion of the circulating water pipe can be converted into an angular displacement that can be absorbed by the articulated compensator, but the bellows is not allowed to undergo axial displacement. For the piping arrangement, see (a). In the figure, the bracket 1 must be set as a spring bracket.
2.2 The second method is to use a bellows of substantially the same size as the bellows compensator to generate an equal and opposite force to cancel the axial force to form a so-called self-balancing compensator. The compensator arrangement is as shown in (b). This kind of device can absorb the line and angular displacement in various directions within a certain range, and the compensation for the circulating water pipe is most advantageous. The disadvantage of adopting this method is that the structure of the self-balancing compensator is relatively complicated, the performance of the compensator itself is high, the volume is also large, and it is difficult to arrange and install.
In the above two schemes, the expansion of the vertical pipe of the circulating water and the displacement difference with the condenser interface are absorbed by the bellows compensator, and the condenser interface is no longer subjected to the displacement difference and the circulating water pipe brought by the internal pressure of the circulating water pipe. There is no need for additional foundation treatment in the valve pit, which saves the construction cost of the civil structure. In comparison, the complex link type bellows compensator has a simple and convenient structure, so this type of compensator was selected in the Suzhou project to compensate the displacement of the condenser circulating water pipe. The operation of the unit shows that it is safe and guilty to use the compensation method for the circulating water pipeline.
Improved compensation method for circulating water pipelines 3 Conclusion The compensation of condenser circulating water pipelines is an engineering problem often encountered in the design of power pipeline systems. When selecting the compensation method, it should be based on the structure of the condenser and the circulating water pipeline in the steam. The layout features in the equipment room must compensate for the axial thrust of the pipeline while compensating for the displacement of the pipeline. Even if the condenser circulating water pipeline runs safely, it can reduce the civil construction cost, especially the large-capacity high-parameter reheat unit. . The complex connecting rod type bellows compensator and self-balancing compensator studied in this paper balance the axial thrust generated by the compensator on the piping system by changing the internal structure of the compensator, which is safe and economical. When the bellows is basically not subjected to axial displacement, a double link type bellows compensator can be used; when the bellows is subjected to a certain axial displacement, a self-balancing compensator can be used.
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