Chimney white smoke low-energy-consumption treatment method

Abstract

The invention discloses a chimney white smoke low-energy-consumption treatment method. The chimney white smoke low-energy-consumption treatment method is characterized in that a heat exchange device is mounted in a smoke discharging device in the direction from purified smoke input to output, white smoke removing is achieved through the heat exchange device through a method of cooling and then temperature rise, lost heat when the smoke is firstly cooled serves as a heat source of the heat exchange device used by subsequent smoke secondary temperature rise, cooling energy during subsequent smoke temperature rise serves as a cold source of the heat exchange device used by previous smoke cooling, the advantage that a cooling tower has the extremely high energy efficiency ratio in the medium temperature field is sufficiently used, the white smoke treatment energy consumption is obviously reduced, meanwhile, an energy recycling mutual feedback system composed of multiple heat exchange devices is used, cooling loads of a second heat exchange device is further reduced, and remaining heat energy recycled by a first heat exchange device can be used for cooling tower exhaust reheating and cooling tower white smoke removing.

Description

[0001] This application is a divisional application of an invention patent application with the application number 201510420605.0, the application date is July 17, 2015, and the invention title is "a method for treating white smoke from chimneys with low energy consumption". technical field [0002] The invention belongs to the technical fields of environmental protection and energy, and in particular relates to a method for treating chimney white smoke with low energy consumption. Background technique [0003] In systems such as wet desulfurization, the wet saturated flue gas at 50°C is usually discharged. Under the cooling of the chimney wall and the mixing and cooling of the ambient air, the flue gas is supersaturated and produces white smoke. [0004] White smoke not only affects the appearance of the environment, but also contains certain harmful components. All countries in the world attach great importance to the problem of white smoke and spend a lot of money on its ...

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Problems solved by technology

[0006] Theory and practice have proved that when the exhaust gas is heated above 100°C, the smoke can be completely eliminated, while the GGH method can only be heated to 80°C, that is, the existing GGH method cannot completely eliminate white smoke. At the same time, GGH recovers high temperature When using flue gas heat energy, it faces serious corrosion problems, and thus generates a lot of maintenance costs

The direct heating method also faces a large amount of energy costs

For example: for every 1 million cubic meters of wet desulfurization flue gas, about 200,000 tons of steam is consumed per year, and the cost of use is 20 million yuan if the steam cost is 120 yuan / ton

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