Seawater desalination water intake system of thermal power plant, and control method thereof

Abstract

The invention discloses a seawater desalination water intake system of a thermal power plant, and a control method thereof. The system comprises a water intake pump, a water intake main pipe and water intake branch pipes, wherein the water intake main pipe comprises a plurality of input ports and a plurality of output ports, the input ports of the water intake main pipe are connected with the output ports of the plurality of water intake branch pipes, the input port of each water intake branch pipe is respectively connected with a water outlet pipe of a circulating water pump, and a water inlet valve for controlling on-off of water intake is arranged on each water intake branch pipe; the output ports of the water intake main pipe are connected with a plurality of water intake pumps, and the water intake pumps deliver seawater to a rear-end seawater desalination pretreatment system; and the water inlet valve and water intake pumps are all controlled by a controller. The seawater desalination water intake system can realize interconnected control of a seawater desalination water intake system, a circulating water dosing system and a circulating water pump, dispenses with construction of a single water intake pump room and arrangement of filter equipment, and is flexible and convenient in operation.

Description

technical field [0001] The invention relates to the research field of seawater desalination in thermal power plants, in particular to a water intake system for seawater desalination in thermal power plants and a control method thereof. Background technique [0002] Freshwater resources are scarce in coastal areas, and more and more thermal power plants have begun to use desalinated seawater as industrial water for power plants. To obtain desalinated seawater, seawater desalination treatment devices must be used, and special equipment must be installed at the input port of the seawater desalination treatment device. The seawater intake system provides fresh seawater for it. [0003] At present, the seawater intake system mainly includes two schemes: [0004] 1. Set up an independent desalination pump room [0005] In order to ensure the water used in the seawater desalination system, this scheme provides fresh seawater for the seawater desalination treatment device by setti...

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Problems solved by technology

[0007] 1) The water intake pump room needs to be set up separately, the amount of civil engineering is large, and the project investment is high;

[0008] 2) Steel gates, trash racks, rotary screens and other equipment need to be equipped, and the project investment is high;

[0009] 3) It is impossible to add fungicides to the water intake settings, and the marine organisms are seriously attached, which affects the safe operation of the system

[0012] 1) Due to flood control requirements, the operating floor of the circulating water pump house has a high elevation. When the long-axis submerged pump is used to draw water, the water intake pump is far away from the water surface, and the diameter of the suction pipe is small, which may easily cause the vibration of the water intake pump, which in turn leads to damage to the water intake pump ;

[0013] 2) The suction pipe of the desalination water intake pump is installed in the flow channel of the circulating water pump room, which may easily cause the water flow in the channel to be disturbed, thereby affecting the efficient operation of the circulating water pump;

[0014] 3) The circulating water system needs to be equipped with a circulating water dosing system to add oxidizing fungicides and non-oxidizing fungicides. Since the fungicides will affect the operation of the seawater desalination system, it is necessary to eliminate the impact by frequently starting and stopping the pump, which is easy to reduce the consumption. pump life

[0015] 4) The efficiency of the long-axis submerged pump is low, which is not conducive to energy saving

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