脱硫泵中的应用
Application of desulphurization 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：
The desulphurization slurry circulating pump is a large equipment after the heat exchanger and the turbocharging fan in the desulphurization system. It is usually used in centrifugal type. It directly extracts the slurry from the bottom of the tower to carry out circulation. It is the largest and most demanding pump in the desulfurization process. Corrosion and abrasion often lead to its failure. Its characteristics are as follows:
（1）强磨蚀性
(1) strong abrasiveness
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 slurry at the bottom of the desulphurization tower contains a large number of solid particles, mainly particles of fly ash and desulphurization medium, the size of which is generally 0 ~ 400µ m, over 90% are 20 ~ 60µ m, the concentration is 5% ~ 28% (mass ratio), and these solid particles (especially Al2O3, SiO2 particles) have strong abrasiveness.
（2）强腐蚀性
(2) strong 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 the typical limestone (lime) gypsum process desulphurization process, the pH value of the general bottom slurry is 5~6, and the pH value can reach 6 ~ 8.5 after adding the desulfurizer (the pH value of the circulating pump slurry is related to the operating conditions of the desulfurizer and the addition point of the desulfurizer); the Cl- can be enriched over 80000mg/L and will produce a strong value under the low pH value. Corrosive.