Sectional tube nest cooling device in decomposing tank

Abstract

The invention provides a sectional tube nest cooling device in a decomposing tank. The sectional tube nest cooling device is composed of multiple sections of cooling tube nests arranged in the decomposing tank, each decomposing tank is divided into multiple sections of heat exchange area from top to bottom, a section of cooling tube nest is arranged in each heat exchange area, and all sections ofcooling tube nests in the same decomposing tank are in parallel connection; each section of cooling tube nest is constituted by an upper annular pipe, a lower annular pipe and a tube nest cluster between the upper annular pipe and lower annular pipe, and the tube nest cluster is constituted by several vertical pipes parallel to the axis of the decomposing tank; water inlets of all sections of cooling tube nests are all communicated with a water inlet main pipe, and water outlets of all sections of cooling tube nests are all communicated with a water return main pipe. Decomposing slurry is directly cooled through sectional tube nest cooling devices in the decomposing tanks, the cooling procedure outside the tank is replaced, equipment investment and running cost are saved, and meanwhile, the work of the operating amount of workers and daily maintenance is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgical equipment, and in particular relates to a segmented tube cooling device in a decomposition tank. Background technique [0002] Seed decomposition is one of the key processes in the alumina production process, which has a significant impact on the yield and quality of the product as well as technical and economic indicators; during the decomposition process, good quality aluminum hydroxide should be obtained, and at the same time, the decomposition of relatively high caustic molecules should be obtained The mother liquor, as the circulating mother liquor for leaching bauxite, constitutes a closed circuit of the Bayer process. [0003] At present, wide-channel plate heat exchangers are widely used for cooling outside the tank in the middle of the decomposition process. The wide-channel plate heat exchangers are more expensive, and during the cooling process, the slurry enters and exits the wid...

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Problems solved by technology

[0003] At present, wide-channel plate heat exchangers are widely used for cooling outside the tank in the middle of the decomposition process. The wide-channel plate heat exchangers are more expensive, and during the cooling process, the slurry enters and exits the wide flow at a relatively high speed. The wide plate of the wide-channel plate heat exchanger is easy to be worn out, and the slurry is easy to scar and block the flow channel; and the existing cooling technology outside the tank must rely on the dump pump to transport the slurry to the The cooling process can only be completed in the wide channel plate heat exchanger outside the tank, and the operation is more complicated

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