Application of chrome-nickel containing alloy vertical concentrated sulfuric acid cooler in low-temperature-position waste heat recycling device and power generation system comprising same

Abstract

The invention discloses application of a chrome-nickel containing alloy vertical concentrated sulfuric acid cooler in a low-temperature-position waste heat recycling device and a power generation system comprising the same. The chrome-nickel containing alloy is composed of 19-30% of Cr, 5-50% of Ni and greater than or equal to 0.5 and less than or equal to 3 of (Cr+Si)/(Ni+Mo) or 19-30% of Cr, 5-50% of Ni and greater than or equal to 0.54 and less than or equal to 2.9, and the vertical concentrated sulfuric acid cooler has an anode protection system. The cooler has wider application range andbetter environment-friendly performance than existing concentrated sulfuric acid. The cooler has the main advantages that on an acid side, usable sulfuric acid concentration range is 93-100%, usable temperature range is 40-130 DEG C, equipment corrosion rate is lower than or equal to 0.1mm per year, and service life of the concentrated sulfuric acid cooler is longer than or equal to 8 years; shell-side acid concentration of the cooler is 93-100%, and temperature range is 40-130 DEG C; circulating water on a tube side is 0-130 DEG C; a cathode of the vertical protection concentrated sulfuric acid cooler is arranged perpendicular to a barrel, so that the defect of cathode replacement at the top end of equipment is avoided. The cooler is compact in structure, small in occupied area and suitable for existing anode protection concentrated sulfuric acid coolers realizing cooling through circulating water and organic working media.

Description

technical field [0001] The invention relates to the technical field of concentrated sulfuric acid equipment, in particular to the use of a chromium-nickel alloy vertical concentrated sulfuric acid cooler in a low-temperature waste heat recovery device and a power generation system composed thereof. Background technique [0002] The raw materials of sulfuric acid are mainly sulfur, pyrite and smelting flue gas from smelters. The production process mainly includes three main processes: combustion of sulfur-containing raw materials, oxidation of sulfur dioxide and absorption of sulfur trioxide. The theoretical heat of reaction accounts for about 56%, 19% and 25% of the total heat of reaction respectively. Most sulfuric acid plants recycle the high and medium temperature potential heat energy produced by the combustion of sulfur-containing raw materials and the oxidation of sulfur dioxide as much as possible. At present, only the low temperature potential heat energy in the proc...

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Problems solved by technology

[0007] The invention provides the use of a vertical concentrated sulfuric acid cooler containing chromium-nickel alloy in a low-temperature waste heat recovery device and a power generation system composed of it. The use of chromium-nickel alloy makes the temperature of the concentrated sulfuric acid dry suction section as high as 130°C. The corrosion rate is greatly reduced. At the same time, the problem of difficult recovery of waste heat at low temperature in the sulfuric acid dry suction section is solved, so that the production of sulfuric acid is self-sufficient in electricity, and can also output a certain amount of heat or electricity to the outside world

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