Water catching device and water catching method for flue gas produced in coal-fired power plant

Abstract

The invention discloses a water catching device and a water catching method for flue gas produced in a coal-fired power plant. The water catching device comprises a cyclone, wherein the side wall of the cyclone is provided with an air inlet tube; an exhaust pipe is arranged at the upper end of the cyclone; a multi-layer cooling pipe network is arranged inside the cyclone; the cooling pipe network is a pipeline formed by arranging a plurality of layers in a cross way; the inlet of the cooling pipe network is connected with a conveying device. The water catching device is a bypass system, has no influence on normal running of the power plant, is easy to manufacture, is convenient to arrange, and has low manufacturing and running costs; catching and recycling of moisture in the flue gas produced in the coal-fired power plant can be realized effectively, the aim of saving water is fulfilled, and the water consumption pressure in coal-fired power plants in areas lack of water such as western areas are relieved; meanwhile, air flowing into a boiler or a bypass for supplementing water is taken as a cooling medium, so that a part of heat can be recycled while water is caught, and energy is saved.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and mainly relates to a coal-fired power plant flue gas water catcher and a water replenishment method. Background technique [0002] Water is crucial to the production of coal-fired power plants. In water-scarce regions such as the west, water directly restricts the sustainable development of power plants. Coal-fired flue gas itself contains a certain amount of water, especially after wet desulfurization, the flue gas reaches saturation and carries a huge amount of water. Taking a 600MW unit as an example, the flue gas volume is about 2 million Nm 3 / h, the saturated flue gas temperature after the desulfurization tower is about 50°C, and the water content is about 87.56g / kg dry flue gas, assuming that the flue gas temperature drops by 5°C (at 45°C, the water content of the flue gas is about 65.977g / kg dry Flue gas), if all the condensed water can be captured and re...

AI Technical Summary

Problems solved by technology

In view of the cleanliness of the flue gas and the quality of the captured water, it can be directly reused in the production system of the power plant after simple treatment, which has obvious economic advantages, but there is a lack of flue gas water capture devices in the prior art

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