System and method of waste heat utilization of indirect cooling tower circulating water in integrated absorption heat pump

Abstract

The invention discloses a system and a method of waste heat utilization of an indirect cooling tower circulating water in an integrated absorption heat pump. The system and the method are mainly applied to an indirect air-cooling coal-fired unit in an arid and water-deficient area of China; the system comprises an turbine, an absorption heat pump and an indirect cooling tower, wherein a main turbine extracts steam to drive the absorption heat pump, an evaporator of the absorption heat pump takes away part of circulating water heat, so as to achieve the effect of reducing the backpressure of the indirect air-cooling coal-fired unit especially in summer high-temperature strong wind weather; condensed water enters an absorber and a condenser of the absorption heat pump to absorb heat, and heat recovery is achieved. By adopting the system, the circulating water temperature can be effectively reduced, and the purpose of reducing the back pressure of the indirect air-cooling coal-fired unitis achieved; and a calculation result shows that the coal consumption of a 660 MW unit can be reduced by 8 g/kWh or above by adopting the system and the method, and relatively high energy-saving and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of intercooling units, in particular to a system and method for utilizing waste heat of circulating water in an intercooling tower integrated with an absorption heat pump. Background technique [0002] Indirect air-cooled thermal power units are widely used in arid and water-scarce areas in my country. In summer, compared with wet-cooled units of the same capacity, the coal consumption of air-cooled units increases significantly, and even the back pressure is high and the load limit operation occurs, which greatly reduces the peak regulation of the units. ability. In high temperature and windy weather, the condensing capacity of the intercooling tower drops significantly, which further affects the back pressure of the unit. At present, the heat of circulating water is taken away by the air in the intercooling tower and enters the atmosphere. This part of waste heat has a large amount. If it can be recycled, ...

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Problems solved by technology

However, the problem with this system is that in order to achieve efficient operation, there must be enough heat users. However, most of the areas where the indirect cooling units are located are in the northwest region, where the demand for heat users is small, and there is basically no demand for hot water in summer with high temperatures and strong winds. It greatly affects the economic benefits of the system and limits the application prospects of this technology

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