Electric power plant water diversion open ditch flow guide heat insulation device and design method thereof

Abstract

The invention discloses an electric power plant water diversion open ditch flow guide heat insulation device and a design method thereof. The device comprises a folded plate type flow guide plate and a flat plate type flow guide plate, wherein the folded plate type flow guide plate comprises a first inclined plate and a first flat plate; one end of the first inclined plate is arranged at an entrance position of an open ditch; the other end of the first inclined plate is connected with the first flat plate; the side edge of the first inclined plate and the side edge of the first flat plate are fixed on the side wall of the water diversion open ditch; the flat plate type flow guide plate is arranged in a connecting position of an exit of the open ditch and a water inlet rectifier box, and comprises a second flat plate; the side edge of the second flat plate is fixed on the side wall of the water diversion open ditch. According to the design method provided by the invention, the design parameters of the current water diversion open ditch and rectifier box culvert and the like is obtained; hydromechanics software is used for building the open ditch flow state of the device provided by the invention; the value calculation optimization is further performed to achieve the goal. The electric power plant water diversion open ditch flow guide heat insulation device and the design method have the advantages that the temperature rise influence of sun radiation on the water body in the water diversion open ditch conveying process can be effectively reduced; the cooling water taking temperature of an electric power plant is reduced; the efficiency of a power generating set is improved; high economic benefits and application popularization values are realized.

Description

technical field [0001] The invention relates to the field of research on the direct current water supply system of a power plant, in particular to a diversion heat insulation device and a design method for an open water diversion channel of a power plant. Background technique [0002] The main water used in thermal and nuclear power plants is the cooling water for the main steam turbine condenser and auxiliary equipment, and its water consumption accounts for more than 90% of the total water consumption of the power plant. This item consumes a lot of water. For example, the cooling water volume of the condenser and auxiliary equipment of a 1000MW conventional thermal power unit is about 25-30m 3 / s. If 4 units are installed in the power plant, the water intake from the water source can reach 100-120m 3 / s; the water consumption of a 1000MW CPR1000 nuclear power unit is about 50-60m for the steam turbine condenser and auxiliary equipment cooling water, and the water used fo...

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Problems solved by technology

The water temperature rise caused by the solar radiation of the cooling water in the water diversion channel will directly affect the design power of the generating set. Taking the water diversion channel supporting four 1000MW ultra-supercritical thermal power generating units as an example, the temperature rise will be As a result, the operating back pressure of the turbo-generator set will increase by about 0.03-0.13kPa (varies according to the temperature of each month), so the output of the generator set will decrease by about 0.02%-0.08%, that is, the actual annual power generation will decrease by 4.4 million- 35.2 million kW.h, if the unit price of the on-grid electricity price is 0.62 yuan / kW.h, if the water diversion open channel scheme is adopted, if the water temperature rise caused by solar radiation during the cooling water transportation process is considered, the annual economic benefits will be lost by about 283-2182 ten thousand yuan

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