Process and equipment for efficiently removing ash in ammonia process desulfurization slurry by adopting membrane filtration

Abstract

The invention discloses a process and equipment for efficiently removing ash in ammonia process desulfuration slurry by adopting membrane filtration. The equipment mainly comprises a circulating tank, a primary filter, a membrane filter, a liquid ammonium sulfate product tank, a washing tank, assorted pipelines and the like. The process comprises the following steps: conveying ammonium sulfate slurry to the circulating tank and stirring, filtering the slurry by the primary filter, and carrying out ash separation in the membrane filter to obtain a clear liquid and an intercepted ash-containing concentrated solution; conveying and packaging the separated clear liquid to form a finished-product liquid ammonium sulfate fertilizer, re-conveying the intercepted ash-containing concentrated solution to the circulating tank and carrying out repeated circulation concentration; starting a process water pump, and respectively carrying out stirring washing and membrane filtering separation; and recycling slag slurry, which is separated by respectively carrying out stirring washing and membrane filtering separation through starting the process water pump, in the circulating tank. The process and equipment disclosed by the invention have the advantages of high slag removal efficiency, simplicity in operation, low equipment fault rate and remarkable economic, social and environment-friendly benefits.

Description

technical field [0001] The invention relates to the technical field of ammonia-based flue gas desulfurization in air pollution control, in particular to a process and equipment for efficiently removing ash in ammonia-based desulfurization slurry by membrane filtration. Background technique [0002] Ammonia flue gas desulfurization technology has the common characteristics of circular economy, high desulfurization efficiency, and high value of by-products, but there is still a problem that has always plagued the entire industry in ammonia desulfurization technology, that is, the accumulation of ash will affect the system operation and the quality of ammonium sulfate fertilizer, etc. question. [0003] Ash comes from sintering flue gas, which contains a lot of heavy metals, dust, CL - , F - ions etc. At present, the ash filter devices in various factories generally use mechanical filter facilities. According to the survey, all the mechanical filter devices in the country ar...

AI Technical Summary

Problems solved by technology

At present, the ash filter devices in various factories generally use mechanical filter facilities. According to the survey, all the mechanical filter devices in the country are not operating normally, and most of them have been shut down or dismantled; The rate is extremely high, and the effect of ash removal is not obvious

Therefore, some domestic ammonia desulfurization manufacturers have to use manual digging to remove the ash. Since the manually dug ash contains 35-40% ammonium sulfate fertilizer, these ash are generally sold at a very low price. To the farmers, and flow into the farmland, causing secondary pollution of heavy metals, etc. Reports of heavy metals polluting rice and vegetables often appear in newspapers

Images