Water and power cogeneration system matched with high back pressure unit for low-temperature multi-effect seawater desalination

Abstract

The invention provides a water and power cogeneration system matched with a high back pressure unit for low-temperature multi-effect seawater desalination. The water and power cogeneration system comprises a generator unit, a flash tank, a low-temperature multi-effect evaporator and auxiliary equipment. The generator unit runs at high back pressure in the system, cooling water of a power plant condenser is relatively high in temperature, the cooling water of the power plant condenser is discharged into the flask tank, low-pressure steam is generated through flashing, the steam is taken as a heat source of a subsequent seawater desalination device, and a low-temperature multi-effect distillation seawater desalination evaporator is driven to produce fresh water. Under the condition of downtime maintenance or an accident, a low-temperature multi-effect evaporator is shortened through a bypass, seawater is taken as a cold source by a fault heat exchanger on the bypass, and circulating cooling water of the power plant condenser is reduced to a set inlet temperature of a condenser. A thermal power plant is organically combined with a multi-effect distillation technology, high-quality heat energy is used for generating electricity, and low-quality heat energy is used for producing water through seawater desalination, so that efficient gradient utilization of the energy is achieved, and the economic benefit of water and power cogeneration is significant.

Description

technical field [0001] The invention relates to a hydropower cogeneration system with low-temperature multi-effect seawater desalination matched with a high back pressure unit, and belongs to the technical field of low-temperature multi-effect seawater desalination. Background technique [0002] Since the 1950s, with the intensification of the water resource crisis, seawater desalination technology has been rapidly developed and popularized, and has become one of the important ways to solve the shortage of fresh water resources. [0003] Seawater desalination is a technology that uses energy to obtain fresh water resources. According to the different forms of energy in the desalination process, seawater desalination can be divided into multi-stage flash evaporation and multi-effect distillation thermal technology that mainly consumes heat energy, and technology that mainly consumes electric energy. reverse osmosis membrane technology. [0004] At present, the operation cost...

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Problems solved by technology

[0004] At present, the operation cost per ton of water for multi-stage flash evaporation and multi-effect distillation is generally high. One of the main reasons is that the high-quality steam turbine extract

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