A Heat Pump Evaporation System Using Flue Gas Purification By-products to Produce Fertilizers

Abstract

The invention provides a heat pump evaporation system for preparing a chemical fertilizer by utilizing a smoke purification by-product. The heat pump evaporation system is characterized by comprising a crystallization reactor, a solid-liquid separator I, a solid-liquid separator IV, a feeding pump, a preheater, a heat exchanger I, a crystallization separator, a compressor and a fluidized bed; a discharging opening of the crystallization reactor is connected with the solid-liquid separator I, a discharging port of the solid-liquid separator I is connected with the feeding pump, the feeding pump is connected with the preheater, a discharging opening of the preheater is connected with the heat exchanger I, the heat exchanger I is connected with a liquid inlet of the crystallization separator through a forced circulating pump, a vent port of the crystallization separator is connected with an air inlet of the compressor through a steam pipeline, a vent port of the compressor is connected with an air inlet of a shell layer of the heat exchanger I, a discharging port of the crystallization separator is connected with the solid-liquid separator IV through a crystal paste pump, and the solid-liquid separator IV is connected with the fluidized bed through a conveying mechanism.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a heat pump evaporation system for preparing chemical fertilizers by utilizing by-products of flue gas purification. Background technique [0002] In recent years, as air pollution has become more and more serious, people have put forward higher requirements for the treatment of flue gas, especially coal-fired flue gas; In accordance with the "Emission Standards for Substances" (GB13223-2011), new emission limits for soot, sulfur dioxide, and nitrogen oxides in flue gas have been put forward. At present, the effective methods of flue gas desulfurization are wet flue gas desulfurization such as ammonia method and sodium method. The above desulfurization methods all produce a certain concentration of waste liquid containing sulfate and nitrate. It has the characteristics of high salt content and partial acidity, and the effluent quality is difficult to meet the disc...

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Problems solved by technology

The secondary steam of a certain effect of the patented evaporator cannot be directly used as a heat source for this effect, but can only be used as a heat source for a secondary effect or several effects.

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