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Application of molybdenum-containing alloy in concentrated sulfuric acid cooler

A technology of concentrated sulfuric acid and molybdenum alloy, which is applied to the types of heat exchangers, heat exchanger shells, indirect heat exchangers, etc., can solve the problems of high water quality requirements, waste of water resources, and the inability to use chlorine-containing sulfuric acid, etc., to improve the resistance Corrosiveness, water saving, and the effect of reducing cooling water replacement

Pending Publication Date: 2018-03-13
TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention provides a use of a molybdenum-containing alloy in a concentrated sulfuric acid cooler, which solves the problems of high water quality requirements, waste of water resources and sewage discharge in existing sulfuric acid equipment, and at the same time solves the problem that the existing concentrated sulfuric acid equipment cannot be used in chlorine-containing sulfuric acid The problem

Method used

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  • Application of molybdenum-containing alloy in concentrated sulfuric acid cooler

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1, with reference to figure 1 , the concentrated sulfuric acid cooler of the present invention is a shell-and-tube heat exchanger, the tube-side medium is cooling water, the shell-side medium is concentrated sulfuric acid, and the cooling water and concentrated sulfuric acid are exchanged through heat exchange tube bundles to achieve the purpose of cooling concentrated sulfuric acid .

[0022] The concentrated sulfuric acid cooler is equipped with an anode protection device, which is composed of: the heat exchange tube bundle 7, the tube plate 6, and the cylinder body 5 of the cooler are used as anodes, and one or several parallel tubes are arranged in the middle of the heat exchange tube bundle 7 The connected cathode 2 has an insulating sleeve; the cylinder 5 of the cooler is insulated and sealed with a control reference electrode 3 and a monitoring reference electrode 4; the anode, the cathode 2, the control reference electrode 3, and the monitoring refere...

Embodiment 2

[0032] Example 2, the structure of the concentrated sulfuric acid distributor, concentrated sulfuric acid pipeline, concentrated sulfuric acid tank and anode protection device made of molybdenum-containing alloy can adopt the structure disclosed in the existing patent documents ZL01124947.1, ZL02154414.X, ZL201010572825.2 or The structure commonly used in the prior art, when the main parts in this structure are made of molybdenum-containing alloy, the sulfuric acid concentration range that can be used on the acid side of the equipment: 90% to 100%, and the usable temperature range: 70°C to 120°C , the equipment corrosion rate is ≤0.1mm / year, the service life of the concentrated sulfuric acid cooler is ≥8 years, which is equivalent to or better than the existing concentrated sulfuric acid equipment; the requirement for the content of chloride ions on the acid side is greatly reduced, and the concentration range of chloride ions in the concentrated sulfuric acid is 0 ~0.05%.

Embodiment 3

[0033] Embodiment 3, the oleum cooler, oleum evaporator, oleum distributor, oleum tank or oleum pipeline structure and the anode protection device configured by the molybdenum-containing alloy can all adopt the existing A structure commonly used in technology. When the main parts of the structure are made of molybdenum-containing alloys, the equipment is on the acid side, the concentration range of fuming sulfuric acid that can be used is 100% to 120%, the temperature range that can be used is 70°C to 200°C, and the corrosion rate of the equipment ≤0.1 mm / year, the service life of the oleum cooler is ≥8 years, which is equivalent to or better than the existing niacin equipment; the requirements for the content of chloride ions on the acid side and water side are greatly reduced, and the concentration range of chloride ions in oleum 0-0.05%; the applicable concentration range of chloride ions in cooling water is: 0.05%-15%, cooling water and industrial sewage with highly concen...

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Abstract

The invention discloses application of a molybdenum-containing alloy in a concentrated sulfuric acid cooler. An alloy with the molybdenum content higher than or equal to 3% is adopted as the molybdenum-containing alloy. The concentrated sulfuric acid cooler made of the molybdenum-containing alloy subjected to anodic protection has the wider application range and the superior environmental-friendlyperformance than an existing concentrated sulfuric acid cooler, and experimental data are mainly embodied in the following aspects that (1), on the acid side, when the acid concentration ranges from90% to 100% and the temperature ranges from 70 DEG C to 120 DEG C, the service life of concentrated sulfuric acid equipment is longer than or equal to 8 years; (2), on the acid side, when the fuming sulfuric acid concentration ranges from 100% to 120% and the temperature ranges from 70 DEG C to 200 DEG C, the service life of fuming sulfuric acid equipment is longer than or equal to 8 years; and (3), the requirements on the chloride ion content on the acid side and the water side are significantly lowered, the concentration of chloride ions in concentrated sulfuric acid and fuming sulfuric acidranges from 0% to 0.05%, the applicable concentration of the chloride ions in cooling water ranges from 0.05% to 15%, cooling water with highly-concentrated chloride ions and industrial sewage can beused, and seawater can be used as the cooling water for an offshore chemical plant.

Description

technical field [0001] The invention relates to the technical field of concentrated sulfuric acid equipment, in particular to the use of a molybdenum-containing alloy in concentrated sulfuric acid equipment. Background technique [0002] The main materials of anodically protected concentrated sulfuric acid coolers commonly used in the sulfuric acid industry are 316L and 304L. The corrosion rate is very low after anodic protection is applied to 316L and 304L stainless steel on the acid side. The service life of the equipment is 5 to 8 years, and the applicable acid concentration range is 93%. ~98%, the applicable acid temperature is ≤90°C; this anode protected concentrated sulfuric acid cooler is characterized by excellent service life and excellent cost performance (the cost is about 1 / 4 of the high silicon stainless steel concentrated sulfuric acid cooler); but 316L Chloride ion pitting resistance of stainless steel is average, the cold medium side usually needs to control ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/16F28F9/02
CPCF28D7/16F28F9/02
Inventor 郑建国李文浩左瑞莫春萍田静王万林王振华
Owner TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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