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脱硫泵的应用及故障分析

电厂脱硫泵装机容量为2×1000MW，采用国产超临界冷凝式燃煤发电机组。锅炉采用低氮熄灭和SCR脱氮安装控制烟气NOx排放，采用静电除尘器和湿法烟气脱硫安装控制烟尘和SO2排放。一座210米高的烟囱被建造起来。
其中，烟气脱硫采用了比拟成熟的石灰石-石膏湿法脱硫工艺。脱硫剂为石灰石（CaCO3）和水制备的30%浓度悬浮浆料。吸收塔为一炉一塔。石灰石浆料、石膏脱水系统和辅助系统的制备是两个炉常见的。
锅炉引风机烟气在可动叶片可调轴流增压器风机与引风机串联的作用下全部进入吸收塔。烟气从底部流向顶部，并经过塔顶烟气入口的上部四层浆料放射层。烟气中的SO2和SO3被吸收剂从上到下吸收构成CaSO. 1/2H2O，并被吸入。鼓泡进入反响器底部的氧化空气被氧化构成石膏（CaSO4）。2H2O）。经过两级串联除雾器除去烟气中的浆液滴后，脱硫过程中的烟气进入烟囱并在大约50℃下排放到大气中。
设计了含硫量为0.43%、脱硫入口烟气流量3139200N/h、脱硫入口烟气温度123C、烟气入口SO2浓度940mg/N m、<100mg/N m的吸收塔四层喷嘴系统。采用偏心喷嘴，浆液从上到下与烟气逆流接触。树立氧化桨罐，在塔架外侧布置4个搅拌器。安装四周有4个泥浆循环泵，单元系统提供4层喷嘴。泥浆循环泵是KSB型单吸离心泵。
 
脱硫液循环泵毛病缘由剖析
机组停电后，对烟气脱硫系统停止了彻底检查和修复。主要系统和设备异常状况如下：
（1）浆液循环泵四个进口泵的衬里全部零落。
（2）喷嘴中有不同水平的异物梗塞（见图2）。
（3）浆液循环泵入口过滤器对泵侧有不同水平的凹进。
（4）脱硫泵厂家泥浆循环泵叶轮不同水平损坏。


The installed capacity of desulfurization pump in the power plant is 2 × 1000MW, domestic supercritical condensing coal-fired generator set is adopted. The boiler adopts low nitrogen combustion and SCR denitrification device to control flue gas NOx emission, and electrostatic precipitator and wet flue gas desulfurization device to control flue gas and SO2 emission. A 210 meter high chimney was built.
Among them, the relatively mature limestone gypsum wet desulfurization process is adopted for flue gas desulfurization. The desulfurizer is a 30% concentration suspension slurry prepared from limestone (CaCO3) and water. The absorption tower is one furnace and one tower. The preparation of limestone slurry, gypsum dehydration system and auxiliary system are common in two furnaces.
The flue gas from the induced draft fan of the boiler enters the absorption tower under the action of the fan of the movable blade adjustable axial flow supercharger and the induced draft fan in series. The flue gas flows from the bottom to the top and passes through the upper four slurry injection layers of the flue gas inlet on the tower top. SO2 and SO3 in flue gas are absorbed by absorbent from top to bottom to form CaSO. 1 / 2H2O and inhaled. The oxidizing air bubbling into the bottom of the reactor is oxidized to form gypsum (CaSO4). 2H2O）。 After the slurry droplets in the flue gas are removed by two-stage series demister, the flue gas in the desulfurization process enters the chimney and is discharged into the atmosphere at about 50 ℃.
The four layer nozzle system of the absorption tower with sulfur content of 0.43%, flue gas flow at desulfurization inlet of 3139200n / h, flue gas temperature at desulfurization inlet of 123c, SO2 concentration at flue gas inlet of 940mg / nm, < 100mg / nm is designed. The eccentric nozzle is adopted, and the slurry is in countercurrent contact with the flue gas from top to bottom. The oxidation paddle tank is established, and four agitators are arranged outside the tower. There are 4 mud circulating pumps around the unit, and the unit system provides 4 layers of nozzles. The mud circulating pump is KSB single suction centrifugal pump.
Failure analysis of desulfurizing liquid circulating pump
After the power failure of the unit, the flue gas desulfurization system was thoroughly inspected and repaired. Abnormal conditions of main systems and equipment are as follows:
(1) The linings of four inlet pumps of slurry circulating pump all fall off.
(2) There are different degrees of foreign matter blockage in the nozzle (see Figure 2).
(3) The inlet filter of slurry circulating pump has different degrees of recess on the pump side.
(4) The impeller of mud circulating pump of desulfurization pump manufacturer is damaged to varying degrees.

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