Fuel cell system and method of operating the system

Abstract

To avoid pressure variation in a cooling water channel, extend a life of an ion exchange resin used to maintain quality of cooling water and reduce power consumption by auxiliary machinery at low cost. There is provided a polymer electrolyte fuel cell, a cooling water tank, a cooling water channel, a cooling water pump, a heat exchanger, a fuel-side condenser and an oxidizer-side condenser that cool exhaust fuel gas and exhaust oxidizer gas discharged from the fuel cell to condense content water vapor, a condensed water tank that stores the water condensed in the fuel-side condenser and the oxidizer-side condenser, a water supply channel having a water supply pump for feeding the condensed water to the cooling water tank, and a water discharge channel for the cooling water tank.

Description

technical field [0001] The present invention relates to a fuel cell system for generating electricity using a fuel cell, an operating method thereof, and the like. Background technique [0002] Hereinafter, conventional solid polymer fuel cell systems will be described in order. [0003] first, Figure 16 It is a configuration diagram of a conventional solid polymer fuel cell system, in which pure water cooling water is supplied to solid polymer fuel cell 1 from cooling water tank 2 through cooling water passage 3 by cooling water pump 4, and the pure water passing through fuel cell 1 The cooling water is cooled by a heat exchanger 5 such as a radiator, and then returned to the cooling water tank 2, thus constituting a cooling water circulation system. [0004] At this time, conductive ions are dissolved into the pure water cooling water from the heat exchanger 5 that is cooled by cooling water. Conductive ions are removed from the water. For this reason, a deionization fi...

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Problems solved by technology

Therefore, the ion-exchange resin inside the deionization filter 6 included in the cooling water path 3 runs for a long time under very severe conditions from the point of view of the durable temperature, which will cause thermal aging and shorten the life easily. When the water quality of the cooling water is good, the cooling water of about 70-80°C also flows through it.

The third problem is that the efficiency of this situation is very poor, and at the same time it further shortens the life of the ion exchange resin inside the deionization filter 6

The higher the pressure of the water supply and the higher the temperature, the more water can be purified, but since a large amount of concentrated water is discarded, the part of the discharged water increases the operating cost

In addition, if the waste water is not wasted, it is necessary to install a water flow path for returning the waste water to the raw water for repurification, etc., and other configurations are required. The above is the fourth problem.

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