A waste heat recovery device and method for power peak regulation gas-fired cogeneration

Abstract

The invention relates to an electric peak load regulation gas-fired cogeneration waste heat recycling device and method. The device comprises a central urban area heat supply system and an external supply area heat supply system which are arranged in a power plant, and the two systems are each composed of a high-temperature heat storage tank, a low-temperature heat storage tank, a steam-water heatexchanger, a heat pump unit, a flue gas heat exchanger and accessories such as valves. The method comprises the steps that the running mode of the device is adjusted through different valve opening and closing combinations, and then the device runs in the electrical load off-peak period and in the electrical load peak period separately. According to the electric peak load regulation gas-fired cogeneration waste heat recycling device and method, thermoelectric decoupling of the gas-fired cogeneration power plant in winter is achieved, flue gas total heat is recycled on the condition that it isguaranteed that the heat supply capacity of an original heat supply network of the central urban area is invariable, the added heat is externally supplied to a newly-added heat supply area, and meanwhile the electric peak load regulation capability of the gas-fired power plant in winter is significantly improved to reduce a wind curtailment phenomenon. The heat supply network of the central urbanarea still runs according to an original heat supply mode, only a large-temperature-difference heat exchange unit of a tail-end heating station of the external supply area needs to be transformed ornewly constructed, and therefore the transforming or newly constructing cost is reduced.

Description

technical field [0001] The invention relates to a heat exchange device and method, in particular to a power peak-shaving gas cogeneration waste heat recovery device and method that utilizes heat storage technology combined with gas cogeneration and power plant waste heat recovery, and belongs to the field of energy power and technology . Background technique [0002] The northern part of my country is an area rich in wind energy, mainly concentrated in Inner Mongolia and northern Gansu, eastern Heilongjiang and Jilin, the coastal areas of the Liaodong Peninsula, the Qinghai-Tibet Plateau, and the northern and coastal areas of the Three Norths. Wind power in these areas is developing rapidly, and its installed capacity is increasing year by year. However, wind power output has randomness and anti-load characteristics, which brings great difficulty to power grid peak regulation. The development of wind power is concentrated in the three north regions, where the local electri...

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Problems solved by technology

[0005] Recovering the full heat of the flue gas requires a large temperature difference transformation in the heating station to reduce the return water temperature of the heating network. However, many old heating stations in the central urban area are small in space and do not have the conditions for transformation. The original heating network in the central urban area is used to recover the waste heat of the flue gas more difficult

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