脱硫泵中的应用 Application of desulfurization pump 脱硫浆液循环泵是脱硫系统中继换热器、增压风机后的大型设备，通常采用离心式，它直接从塔底部抽取浆液进行循环，是脱硫工艺中流量最大、使用条件最为苛刻的泵，腐蚀和磨蚀常常导致其失效。其特性主要有： Desulfurization slurry circulating pump is the relay desulfurization system after the heat exchanger, blower fan of large equipment, usually adopts the centrifugal, it directly from the bottom makes a cycle of slurry is largest in desulfurization process flow and use of the most demanding conditions of pump, corrosion and abrasion often lead to the failure. Its features include: （1）强磨蚀性 (1) strong abrasion 脱硫塔底部的浆液含有大量的固体颗粒，主要是飞灰、脱硫介质颗粒，粒度一般为0～400µm、90%以上为20～60µm、浓度为5%～28%（质量比）、这些固体颗粒（特别是Al2O3、SiO2颗粒）具有很强的磨蚀性 The liquid in the desultiate contains a large amount of solid particles, mainly flying ash and desulphurized medium particles, which are generally 0 ~ 400 µ. More than 90 percent of the time is 20 to 60. M, the concentration is 5% ~ 28% (mass ratio), these solid particles (especially Al2O3, SiO2 particles) are highly abrasive （2）强腐蚀性 (2) corrosiveness 在典型的石灰石（石灰）-石膏法脱硫工艺中，一般塔底浆液的pH值为5～6，加入脱硫剂后pH值可达6～8.5（循环泵浆液的pH值与脱硫塔的运行条件和脱硫剂的加入点有关）；Cl-可富集超过80000mg/L，在低pH值的条件下，将产生强烈的腐蚀性。 In a typical limestone (lime) - gypsum desulphurization process, general bottom slurry pH value for 5 ~ 6, after joining desulfurizer pH value of 6 ~ 8.5 (circulating pump slurry pH value and the operating conditions of desulfurization tower and desulfurizer join points); Cl-rich set over 80000mg/L, under low pH, will have a strong corrosive effect.