Status of NPKs Ammoniation-Granulation Plants and TVA Pipe-Cross Reactor

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This document provides an overview of the status and prospects of NPKS (nitrogen, phosphorus, potassium, sulfur) ammoniation-granulation plants and TVA (Tennessee Valley Authority) pipe-cross reactors in the fertilizer industry. The study conducted surveys and interviews with plant production supervisors to gather data on the number of operating plants, annual tonnage produced, and the use of pipe-cross reactors. The results indicate that 107 granulation plants operated by 37 companies had 8.5 million tons of homogeneous NPKS granular fertilizers in the last year. The most popular grades produced include 6-24-24, 10-10-10, and 13-13-13, among others. Additionally, the installation and operation of pipe-cross reactors are discussed, highlighting design features, operating parameters, and significant results. Using pipe-cross reactors has led to savings in fossil fuel heat input for drying, increased production rates, and improved product quality. The document also presents specific cases, such as the production of MAP (monoammonium phosphate) 11-53-0-2S and using byproduct sulfur sources in the 16-8-8-XS grade. Finally, the economic aspects of retrofitting pipe-cross reactors into existing plants are explored, demonstrating that the investment costs are relatively small, and the payback period is usually less than one year.
NPK fertilizers, Production