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Sulfuric acid circulating pump development and its application

With domestic phosphate &compound fertilizer and non-ferrous metal smelting enterprise's development, and more stringent environmental requirements, there are more and more large sulphur and smoke in acid device are building or will construction. As contact method sulphuric acid production plant key equipment --- vertical high-temperature concentrated sulfuric acid circulating pump, big flow model mostly depends on imports, Kunming Jiahe pump industry Co.,ltd adopts advanced materials and technology, has successfully developed, produced large flow high temperature concentrated sulfuric acid circulating pumps, used in JiangTong Guixi smelter, Yunnan Sanhuan company, Yunnan Furui Company, Gansu Jinchuan nonferrous metals corporation, Zhejiang Jiahua.
1、preface
In the late 1980s, as one of the key equipments in the contact method sulphuric acid production plant, dry, absorption high-temperature sulfuric acid circulating pump has basically completed its nationalization. So far in large and medium-sized sulphuric acid production device, the overwhelming majority of dry, absorption high-temperature sulfuric acid circulating pump (flow below 1000m3/h) have to use domestically-manufactured equipment, only a few large flue gas in acid device and through foreign contractors device still uses imported dry, absorption high-temperature sulfuric acid circulating pump.
With sulphur phosphorous chemical enterprise and non-ferrous metal smelting enterprise bigger and stronger domestic demand, sulfuric acid devices become more large-scale and super-large (800kt/a or above). In the optimized sulphuric acid technology design, in addition to the traditional three slot three pump three towers cycle way, now more using two slot two pump three tower, one slot two pump three towers, and even one slot one pump three towers cycle way. So to high temperature concentrated sulfuric acid circulation pump flow and reliability put forward higher request.
Kunming Jiahe pump industry Co.,ltd based on market need, excellence innovation, absorbing foreign advanced experience of sulfuric acid, combined with years high-temperature sulfuric acid pump design and production experience, based on successful development, production big flow 1200m3 / h and 1400m3 / h high temperature concentrated sulfuric acid, self-design, and manufacture jhb2000-26 high temperature concentrated sulfuric acid pump, its flow is 2000m3/h, head is 26m, to satisfy large sulphuric acid production plant circulation requirements. Belows are brief introductions of high temperature large flow concentrated sulfuric acid circulation pump all round conditions
2、 material features
Materials refers to foreign high temperature concentrated sulfuric acid pump advanced materials technologies, developed independently by the ni-based austenitic stainless steel JSB-11 alloy, used to manufacture impeller, sleeve, bushings, sealing rings. This is a specially designed for high temperature sulfuric acid pump developed special alloy, after heat treatment hardening make its hardness from Bronell hardness 225 rise to Bronell hardness 500 and not lower its corrosion resistance, with strong abrasion resistant and corrosion resistant to scour, in the 98% h2so4 use temperatures as high as 140 ℃, even in 93% h2so4 also 100 ℃, used under above two kinds of circumstances its annual corrosion rate (static hanging) were below 0.02 mm/a.
Jiahe company newly developed JSB - 1, JSB - 2 new-type alloy ductile iron, because added to the composition of the alloy in the original foundation, the addition of nickel, chromium improve its corrosion resistance in sulfuric acid, joined the Cu, Mo and rare earth to improve metallographic structure, fine grains, increased hole corrosion resistance. It forms ultramicroelectrode feso4 in high temperature concentrated sulfuric acid, crso4 colloid formed stable purification membrane, blocking sulfuric acid corrosion.
Using JSB - 1 manufactured axes, and after spheroidizing special heat treatment, with good strength and corrosion resistance, because alloy itself already have a good corrosion resistance and dropped the traditional shaft bag of teflon approach makes overhaul, processing, transportation more convenient. JSB-2 is used in the manufacture of pump body, center nozzles and produced liquid pipe, etc.
3、 structural features
In structural form, on the basis of the first generation of large flow high temperature concentrated sulfuric acid circulating pump conducted second generation new design, improve pump operation reliability and improve the efficiency of pumps.
a、 followed traditional JHB vertical high temperature concentrated sulfuric acid pump structure advantages, using six grade motor drive, compact structure, in hydraulic model design, fully considering the NPSH, make the efficiency of pumps can be as high as 80%, pump running smoothly, reduce energy consumption.
b、 According to recent horizontal circulation slot design requirements, extends pump impeller floor to the centerline distance is 1900mm ~ 2100mm, adding the suction pipe total submerged depth can achieve 3300mm, satisfy production technology requirements.
c、 use semmetry homogeneities shell structure design, reduce sliding bearing radial load, prolong the service life of sliding bearings.
d、 improving joint installation and localization way, makes operation more simple, maintain more convenient.

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