Electric power plant circulating water rock plug type intake and construction method

Abstract

The invention provides a rock-plug type water intake for the circulating water of power plants, as well as a construction method thereof. The rock-plug type water intake is arranged near a deep pool and mainly comprises a rock plug, a ballast collection pit and a derivation tunnel behind the ballast collection pit, wherein the derivation tunnel is arranged in a mountain body; an axis close to an inlet segment declines so as to keep the axis of the rock-plug type water intake at an upward inclination angle between 35 and 60 degrees; the outlet end of the derivation tunnel is directly connected with an inflow forebay of a circulating pump room; the sinking-type ballast collection pit is built between the derivation tunnel and the rock plug; the cross sections of the derivation tunnel and the rock plug are round, similarly round, square or rectangular; and the thickness-diameter ratio of the rock plug is between 1.13 and 1.50. The construction method comprises the following steps: the excavation construction of the derivation tunnel and the ballast collection pit is performed according to a new Austrian method; whether to line or not is determined according to the conditions of bedrock; the rock plug is blasted by use of a presplitting and millisecond time interval method; and once the rock plug is blasted, all ballast of the rock plug enters the prearranged ballast collection pit under the action of external water pressure. The construction method has the advantages of reducing project investment, shortening construction period, improving the operation efficiency of a circulating water system, and the like.

Description

technical field [0001] The invention relates to a seaside power plant, including a water intake for circulating water in the rock foundation area of ​​coal, fuel oil, gas, nuclear power, etc. and a construction method, and belongs to the technical field of power plants. Background technique [0002] Coastal power plants generally adopt a once-through circulating water system. In order to ensure its reliable and economical operation, according to the requirements of the "Technical Regulations for Design of Thermal Power Plants", the intake and drainage must be arranged according to the principle of "deep intake and shallow drainage", namely: water intake The setting of the bottom elevation must be able to meet the seawater flow requirements of the minimum tide level with a guaranteed rate of 95% to 97%. [0003] In order to save investment, the water intake construction crops of the Binhai Power Plant are often arranged on the seaside hills with good geological conditions in ...

AI Technical Summary

Problems solved by technology

However, due to the large amount of blasting, the impact force of the blasting poses a great safety hazard to the circulating pump facilities of the first and second phases of Wenzhou Power Plant, which is running nearby. If it is serious, it will cause a major accident of the shutdown of the first and second phases

Since the diversion water of the open channel is a surface flow, affected by the backflow of the drainage, the water intake temperature is higher than that of the diversion tunnel for deep water intake, which affects the operating efficiency of the circulating water system, thereby affecting the power generation efficiency of the power plant

In addition, since the open channel is open and directly communicates with the outside water, it is often blocked by a large number of river drifts during the annual flood season.

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