Ammonia process two-stage countercurrent smoke-discharging and treating device, and method thereof

Abstract

The invention discloses an ammoniation two-stage upstream exhaust treatment device and a method thereof, which take volatile ammonia as raw materials and recover acid waste gas as useful products, the innovative essence thereof lies in that the invention provides two-stage independent absorption liquid circulating systems with ammonification and without ammonification, comprising independent two-stage absorption liquid spray devices arranged in a reaction tower to facilitate the method of the invention to comprise seven continuous steps including primary and secondary treatment, in particular to optimize the internal structure and relative size of the reaction tower as well as the size of an absorption liquid circulating tube and circulating load of absorption liquid, therefore, the operating gas-liquid ratio is set as 70-195. Compared with the prior art, the invention has the characteristics of greatly increased stability and reliability in the operation of the device, more effective control of loss due to ammonia escape, low energy consumption, simple structure of the device, reduced scarring and obstruction of the device and saved investment and operating cost, and has obvious application prospect in the field of exhaust purification such as boilers and the like.

Description

Technical field [0001] The invention relates to a device and method for flue gas treatment, that is, flue gas purification, in particular to a flue gas desulfurization device and method based on ammonia as a raw material to recover sulfur oxides from flue gas to produce useful products, belonging to electric power, metallurgy, Technical fields such as environmental protection and chemical industry. Background technique [0002] Thermal power plants that use coal or petroleum as fuel, and sintering machines in steel plants emit a large amount of flue gas, that is, flue gas, which contains SO 2 , SO 3 , NO 2 , NO, HCl and HF and other acid gaseous hazardous substances, especially SO 2 It is the main substance that forms acid rain. One way to solve acid rain pollution is the purification of flue gas, especially flue gas desulfurization (FGD, Flue Gas Desulfurization) using alkaline substances as raw materials. [0003] According to the different raw materials used, the classificatio...

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Problems solved by technology

However, the structure is still slightly complicated due to a special layer of packing section for cleaning flue gas and removing water vapor and acid mist, and since water vapor is a kind of gas, acid mist is also an aerosol, both of which are very It is difficult to remove through simple components or methods, the efficiency is low, and there is no practical application value; the gas-liquid ratio is still too high, 200-2500, and in the actual use process, due to the use of an empty tower structure without packing, there will be Because the liquid flow rate is too small and the mass transfer specific surface area is too small, it still has the disadvantages of unstable desulfurization efficiency and easy waste of raw material ammonia. Moreover, there are only two absorption liquid circulation systems, and each spray system is equipped with multiple sprays Layers, resulting in too complex structure in the tower, and in practical applications, it is easy to cause the desulfurization device to be difficult to operate due to failure or even damage of the circulating pump

[0009] To sum up, in the existing technology, either the gas-liquid ratio is too small, that is, the absorption liquid circulation is too large, resulting in excessive energy consumption, or the structure of the desulfurization tower is too complex, which is easy to block and scar, resulting in difficulty in operation, which in turn leads to ammonia slip control Capital and / or operating costs remain high

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