Ammonia-process desulfurization and decarbonization integrated device and method

Abstract

The invention is applied to desulfurization and decarburization of process gas containing sulfur oxides and CO2, and belongs to the field of environmental protection, ammonia is used as a desulfurization and decarbonization agent, the gas firstly enters a desulfurization device for desulfurization to generate ammonium sulfate fertilizer, the desulfurized gas enters a decarbonization device to remove carbon dioxide in the gas to generate ammonium bicarbonate fertilizer, the decarbonized gas contains free ammonia, is washed with a desulfurization circulating solution and then is washed with water, and the washing solution returns to a desulfurization tower and is used as an absorbent for desulfurization. A desulfurization unit is provided with a cooling device for cooling the flue gas, so that the subsequent decarburization requirement is met. Condensate water generated in the desulfurization cooling process is used as ammonia washing replenishing water or used for other purposes after being subjected to film separation and purification, concentrated water returns to a desulfurization area, and no waste water is generated. According to the technology, decarburization and desulfurization technologies are organically integrated, ammonia washing efficiency is high by adopting acidic desulfurization circulating liquid to wash ammonia, the problem of ammonia escape in the decarburization process is successfully solved, the process is simpler, investment and operation cost is low, by-products of ammonium sulfate and ammonium bicarbonate fertilizer are produced, CO2 does not need to be reinjected underground for storage, by-product ammonia water can be used, and the purposes of treating waste with waste and recycling economy are really achieved.

Description

Technical field: [0001] The present invention belongs to the field of environmental protection, and more particularly to devices and methods for ammonia to remove thioside and CO2. Background technique: [0002] Co in the atmosphere 2 , Methane, etc., can be transmitted through the solar short-wave radiation, but can block long wave radiation from the surface of the earth to the space of the universe, with CO 2 The increase in greenhouse gas concentration, resulting in an incident energy greater than emissivity, resulting in an increase in the temperature of the Earth's atmosphere, and this phenomenon is called Greenhouse Effect. [0003] Carbon dioxide is the most important greenhouse gas, fossil energy use is the main source of emissions, my country's total CO2 emissions has ranked first in the world, and China's energy structure is mainly based on coal, and the coal energy will continue for a while. It is the basis of new energy peaks and energy security. my country has promis...

AI Technical Summary

Problems solved by technology

This method has the following problems. It directly uses water washing, and the washed water is returned to the desulfurization system. If a large amount of water is brought into the desulfurization system, the desulfurization by-product ammonium sulfate cannot be crystallized in the tower, and evaporation crystallization is required, resulting in increased investment and operating costs; Using sulfuric acid to further wash ammonia will result in consumption of sulfuric acid; the third process is complicated, requiring a separate contact cooling device and contact reheating device, high investment and operating costs

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