Multi-cycle cooling system adopting seawater for cooling

Abstract

The invention relates to a multi-cycle cooling system adopting seawater for cooling, which fully utilizes the advantage that a mature deionized water technology is used as a cooling medium and the convenience of seawater resources, solves the problems of high seawater corrosivity, marine biological pollution, difficulty in water taking and the like, improves the reliability and stability of an offshore platform system. For cooling of core equipment of the offshore platform such as a converter valve, a transformer and a heating and ventilation system, the aging problem of a heat exchanger with long working time is considered, the performance of the core equipment is evaluated, control parameters of the whole circulation system are adjusted, the cooling effect is ensured on the basis of ensuring energy conservation, the stability of the whole circulation system is improved, particularly, an intermediate isolation loop is additionally arranged between cold source seawater and deionized water circulation, oil path circulation and refrigerant circulation loops, and a pressure increasing design method of loop cooling medium pressure difference is adopted, so that a cooling medium on a low-pressure side is prevented from polluting a cooling medium on a high-pressure side due to leakage of a heat exchanger, and the product reliability is improved.

Description

technical field [0001] The invention relates to the field of cooling systems, in particular to a multi-circulation cooling system using seawater cooling. Background technique [0002] HV / UHV DC transmission converter stations, flexible DC converter stations, high-power wind turbines, offshore platforms and other high-power power electronic equipment are generally used to Ionized water for cooling and heat exchange. Use deionized water to bring the heat loss of high-power power electronic devices to the outside to exchange heat with air or water, so that the devices can work in the optimal temperature range. [0003] Traditional onshore high-power power electronic equipment water cooling system, external heat dissipation mainly adopts several methods such as air cooler, closed cooling tower, air cooler series closed cooling tower, etc. The equipment occupies a large area and consumes a lot of water, which is mainly used The cooling object is high-power power electronic equi...

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Problems solved by technology

The deionized water cooling system used in the heat exchange of existing high-power power electronic equipment, when the external heat exchange adopts the air cooler for heat exchange, the heat capacity density of the air is low, the equipment occupies a large area, and the heat exchange efficiency is low; when the external heat exchange When the heat is exchanged by a closed cooling tower, the floor area is small, and the heat exchange is realized through the latent heat of evaporation of the spray water. The loss of fresh water is large, and fresh water needs to be continuously replenished; in order to save water resources, air coolers are used in Northwest China The series closed cooling tower scheme can save fresh water resources, but the equipment occupies a large area and is noisy;

[0005] 2. The cooling capacity of the offshore platform is larger, the cooling objects are wider, and the cooling system is highly complex. The mature cooling technology on site cannot meet the application requirements. In order to overcome the shortcomings of the traditional cooling system, save resources, reduce energy consumption, and improve the cooling system Reliability, the offshore platform cooling system needs to make full use of abundant and stable seawater resources as the external cold source of the cooling system. When seawater is used as the external cold source, the core equipment of the offshore platform, such as high-power converter valves, circuit breakers, etc. have extremely high requirements on the insulation and corrosion resistance of cooling water. It is necessary to make full use of the mature deionized water cooling technology and overcome a series of problems such as strong seawater corrosion, marine biological pollution, and difficulty in water intake.

[0006] 3. With the use of the cooling system, the heat exchanger will be aged to varying degrees, and its heat transfer performance will be attenuated. The above factors are not considered in the prior art, and the control parameters of the cooling system are made according to the performance change of the heat exchanger. Adjustment

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