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    Home > Agriculture News > Fertilizer News > Shaanxi Chemical's flue gas desulphurization ammonium sulfate post-treatment system has achieved remarkable results

    Shaanxi Chemical's flue gas desulphurization ammonium sulfate post-treatment system has achieved remarkable results

    • Last Update: 2022-03-18
    • Source: Internet
    • Author: User
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    5 tons.
    Monitoring shows that the emission indicators of sulfur dioxide, smoke and nitrogen oxides all meet the requirements of the new national environmental protection emission indicators.
    It is estimated that the boiler can reduce nitrogen oxide (NOx) emissions by 1728 tons per year, which plays a positive role in protecting the surrounding atmospheric ecological environment.
    Shaanxi Chemical's ammonium sulfate post-treatment system is a slurry treatment system designed for wet ammonia/ammonium sulfate flue gas desulfurization.
    The evaporation crystallization process is used to desludge, evaporate, separate and dry the high-concentration ammonium sulfate slurry in the absorption system to produce solids.
    Ammonium sulfate products.
    The evaporation unit is the most important part of the ammonium sulfate post-processing system.
    The original design was adopted by the first-effect evaporator, the first-effect heater, the first-effect axial flow pump, the second-effect evaporator, the second-effect heater, and the second-effect axial flow pump.
    For series connection, most of the pipe material is FRP.
    Once a certain link leaks or malfunctions during operation, it will inevitably cause all the post-processing systems to stop.
    If the maintenance time is too long, it will affect the safety, stability, and long-term operation of the first and second phases of the flue gas desulfurization absorption system.
    In severe cases, it may cause smoke in the flue gas.
    Excessive emissions of sulfur dioxide and soot.
    In January 2016, due to the poor vacuum of the ammonium sulfate post-treatment system, the system could not be produced normally.
    During the leak detection and leak test, it was found that the tank of the first-effect separator was deformed and damaged, which affected the vacuum of the system.
    The system was put into operation after analysis.
    In recent years, due to long-term corrosion, erosion, and wear, the inner layer has fallen off seriously, the strength of the tank has been weakened, and the weak parts of the tank will be damaged under the action of negative pressure and high temperature for a long time.
    After the repair and operation, local cracking and deformation occurred again, causing the ammonium sulfate post-processing system to be in a state of paralysis, which seriously affected the stable operation of the flue gas desulfurization absorption system.
    In response to this severe situation, Shaanxi Chemical Company quickly held a special meeting.
    On the one hand, drawing on the successful experience of double-effect conversion to single-effect evaporation units of brothers, it was decided to transform the second-effect first to realize the two-effect single-effect evaporation to maintain the production of the system and stabilize the absorption system; On the one hand, step up the procurement of single-effect separators; after the plan is determined, the process and equipment will be carried out simultaneously, the transformation plan will be formulated, the transformation drawings will be drawn, and the material and spare parts will be prepared, and the two-effect single-effect evaporation transformation project will be completed in the same month.
    In the initial stage of operation of the two-effect single-effect evaporation, due to the lack of sufficient understanding of the single-effect evaporation by the technicians and operators, the inadequate control of the process parameters, and the failure to eliminate the original defects of the system in time, the system operation was twisted and twisted; for this reason, the process The technician once again carefully checked the process pipeline to confirm that the transformation fully met the process requirements, and then carefully analyzed and explored the abnormal conditions and failure causes of each shift.
    After a period of summary and comparison, it was finally judged as the cause of the pipeline blockage.
    Due to the long-term failure of the agitator of the ammonium sulfate solution storage tank, as crystals become more and more during the evaporation process of the system, the deposition in the ammonium sulfate solution storage tank induces pipe blockage accidents; resulting in a long system evaporation time, less crystallization, and the system The factor that cannot be continuously produced is that the condensate pipeline at the outlet of the two-effect heater has many leaks due to long-term corrosion, wear and tear, resulting in reduced system vacuum, too much heat loss, and low heat utilization rate of the evaporation unit, which affects the evaporation efficiency.
    With the deep exploration of the system, investigation, research and gradual recognition of the principle of single-effect evaporation, the bottleneck problem that plagued the two-effect single-effect evaporation began to emerge.
    The company immediately shut down the system and replaced the outlet of the two-effect heater.
    For the condensate pipeline, measures such as regular replacement and flushing of the ammonium sulfate solution storage tank have been taken to restore the normal production of the sulfuric acid post-treatment system, realizing the long-period operation of two-effect single-effect evaporation, and achieving the purpose of two-effect single-effect evaporation transformation.
    After the first and second effect single-effect evaporation operation and production have accumulated a wealth of experience and technical foundation.
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