Technology for producing ammonium sulfate fertilizer through desulfurizing smoke by ammonia process, and apparatus thereof

Abstract

The invention relates to an apparatus for producing an ammonium sulfate fertilizer through desulfurizing a smoke by an ammonia process, and a method thereof. The apparatus comprises a desulfurization tower, an evaporating crystallizer, a cyclone, a thickener, a centrifuge, a drying machine and a packaging machine, wherein the top of the evaporating crystallizer is provided with a stirrer; the penetration depth of a propeller into the evaporating crystallizer is 1 / 3-2 / 3 of the length of the evaporating crystallizer; the upper part of the evaporating crystallizer is provided with a barrel-shaped baffle plate; the diameter of the barrel-shaped baffle plate is 1 / 3-3 / 4 of the diameter of the evaporating crystallizer; a guiding cylinder is arranged in the barrel-shaped baffle plate; the diameter of the guiding cylinder is 1 / 3-2 / 3 of the diameter of the barrel-shaped baffle plate; the lower part of the guiding cylinder is positioned on the upper part of the propeller of the stirrer; and the upper end opening of the barrel-shaped baffle plate is connected with a vacuum pump. The stirrer, the barrel-shaped baffle plate and the guiding cylinder enable a crystallizing solution to circulatorily flow, so the retention time of ammonium sulfate particles in the crystallizing solution is prolonged, the ammonium sulfate particles gradually grow, and the ammonium sulfate particle sizes are 100-1000mum, thereby the apparatus and the technology have the characteristics of high smoke purification, effective improvement of the ammonia absorbent utilization rate and the like, and have the advantages of equipment investment saving and operation cost saving.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization in the fields of coal-fired thermal power, coal-fired boilers, iron and steel sintering machines, nonferrous metallurgy and chemical building materials, and in particular to a process and device for producing ammonium sulfate fertilizer through ammonia flue gas desulfurization. Background technique [0002] With the rapid development of my country's industrialization and economic construction, the pollution of SO2 in industrial flue gas has become increasingly serious. At present, after the construction of large-scale flue gas desulfurization projects during the "Eleventh Five-Year Plan", my country's flue gas desulfurization capacity and installed capacity have jumped to the first place in the world. However, as of 2010, my country's annual SO2 emissions into the atmosphere are still More than 20 million tons, and with the demand for energy and resources in my country's economic d...

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Problems solved by technology

Because this process can effectively use the heat of the original flue gas, it has great advantages in energy saving. However, the particle size of ammonium sulfate particles formed by this process is small and the distribution range is narrow. The particle size distribution of ammonium sulfate particles Only 30-60μm, resulting in the difficulty of subsequent centrifugal separation, it is not easy to obtain qualified ammonium sulfate products, and the output is very low, and at the same time, the failure rate of the equipment is very high.

Adopt (2) kind of evaporative crystallization process, the ammonium sulfate particle that obtains is larger, and particle size distribution is more uniform, and the ammonium sulfate product quality that obtains is better, and the failure rate of equipment is low; But adopt this kind of technology but need expend a large amount of Steam energy, increasing the corresponding operating costs

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