过程分析

烟气脱硫

在湿式洗涤塔中将腐蚀性 SO₂ 气体从火力发电厂或垃圾焚烧热电厂的废气中分离出来。使用石灰乳、生石灰或者氢氧化钙来吸收 SO₂。所产生的石膏可以重新用于建筑材料行业。为了彻底去除 SO₂ 并满足官方对洁净空气的规定，精确的 pH 测量在该过程中至关重要。

主要应用概况

领域

配有烟气洗涤设备的发电厂

应用

3 种应用（1. 检查预洗涤塔中的 pH 值，2. 中和塔，3. 石灰洗涤塔）

测量参数

pH

主要要求

测量回路有腐蚀性，并且会形成严重结垢。

在形成厚石膏层的过程中进行测量

应用说明

应用 1：
在预洗涤塔中（第 1 阶段）加入石灰乳冷却高温烟气。pH 值仅略微升高（通常在 80 °C 时 pH 值介于 1–2 之间）。这里 pH 值不能上升到 2 以上，因为仅需析出 HCl/HF 和重金属，在第二段结合 SO₂。精确控制 pH 至关重要。

应用 2：
在第二阶段主洗涤塔中继续加入石灰提高 pH 值。SO₂ 被结合。必须通过连续的 pH 测量来控制石灰乳加入量。如果 pH 值太高，则加入了太多石灰（成本较高），且石膏被过多的氢氧化钙污染。如果 pH 值太低，则 SO₂ 结合效率不高。

最佳 pH 值介于 5.5 和 6.0 之间。较高的值会造成柔软油腻的亚硫酸钙沉积物（软堵塞），并且效率略有降低。较低的 pH 值则会造成难以去除的严重结垢（形成硬垢）。pH 测量回路通常位于亚硫酸钙/石膏泥浆的回流循环管路中。

应用 3：
必须对石膏沉淀/浓缩之后剩下的过量水进行中和处理。为此加入硫酸，以结合多余的石灰。在该测量回路还会出现严重的结垢和沉积物。

所有 3 个测量回路对于实现最佳过程条件都极为重要。这些地方都有腐蚀性，并且会形成严重结垢，导致维护费用高昂。Knick 建议将全自动清洁与校准系统用于这些应用，以减少人工工作量，提高过程可靠性

应用的要求

该应用的主要挑战在于气体洗涤塔中会形成厚石膏层。

为何选择 Knick？
Ceramat 因为采用了独特的陶瓷密封，是唯一可用于此应用的连接件。Ceramat 的除垢器（“Pump Sock”）可去除沉积物，如不去除会完全堵塞系统。采用独特的传感器维护系统，可实现全自动清洁、校准传感器，大幅减少维护工作量。

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烟气脱硫

烟气脱硫

主要应用概况

领域

应用

测量参数

主要要求

在形成厚石膏层的过程中进行测量

相关产品

相关工业和应用

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