The water balance of the desulfurization system refers to that all the water entering the desulfurization system (including the water carried by the original flue gas, equipment flushing water, mist eliminator flushing water, water contained in the slurry supply, etc.) is equal to the water loss of the desulfurization system. Controlling the water balance of desulfurization system during operation mainly controls the amount of water entering the system according to the water loss of the system, so as to maintain the dynamic balance between the two, that is, controlling other water entering the system on the premise that the total water inflow is equal to the total loss. The desulfurization system can generally ensure the normal liquid level of the absorption tower, but when the flue gas temperature at the inlet of the absorption tower drops sharply, the slurry evaporation in the absorption tower decreases, the liquid level of the absorption tower is at a high level, and the water balance imbalance occurs from time to time. In order to understand the reasons for the imbalance, we must first understand the factors affecting the water balance of wet desulfurization absorber. Let's analyze it together.

一、影响湿法脱硫吸收塔水平衡的因素

1、 Factors affecting water balance of wet desulfurization absorber

1、燃煤硫分

1. Sulfur in coal

当燃煤的收到基硫分增加时，二氧化硫的质量浓度就会增加，参与反应的物料增加，即石灰石浆液量大，整个脱硫系统的各用水点的耗水量上升，故整个脱硫系统整体耗水量增加。

When the received base sulfur content of coal increases, the mass concentration of sulfur dioxide will increase and the materials involved in the reaction will increase, that is, the amount of limestone slurry is large, and the water consumption of each water point of the whole desulfurization system will increase, so the overall water consumption of the whole desulfurization system will increase.

2、石膏脱水

2. Gypsum dehydration

石膏脱水时，滤液返回水由旋流器返回水、皮带脱水机滤布冲洗水、密封水、气液分离器排水、真空泵冷却水汇集滤液箱后返回脱硫系统。而排出水量只有到废水处理的脱硫废水(排入脱硫废水量低于设计处理量12t/h)。滤液返回水量进脱硫系统后将使脱硫系统的水平衡破坏，造成脱硫系统液位上涨。

During gypsum dehydration, the filtrate return water is collected by the cyclone return water, belt dehydrator filter cloth washing water, sealing water, gas-liquid separator drainage and vacuum pump cooling water into the filtrate tank and then returned to the desulfurization system. However, the amount of discharged water is only the desulfurization wastewater treated by wastewater (the amount of discharged desulfurization wastewater is 12t / h lower than the design treatment capacity). After the filtrate return water enters the desulfurization system, the water balance of the desulfurization system will be destroyed, resulting in the rise of the liquid level of the desulfurization system.

3、滤液反水量

3. Filtrate backwash

发现脱硫系统进水量大于排出量(蒸发量)其中滤液反水量是造成脱硫系统进水量大的主要原因。

It is found that the water inflow of the desulfurization system is greater than the discharge (evaporation), and the filtrate backwash is the main reason for the large water inflow of the desulfurization system.

4、吸收塔出口烟温

4. Flue gas temperature at the outlet of absorption tower

吸收塔出口烟温决定了吸收塔出口烟气携带气态水的能力即烟气的含湿量。若原烟气参数不变，吸收塔出口烟温发生变化时，脱硫系统的耗水量会有很大变化。从这些影响因素可以看出几点吸收塔水平衡失衡的原因，下面我们来具体分析下。

The flue gas temperature at the outlet of the absorber determines the ability of the flue gas at the outlet of the absorber to carry gaseous water, that is, the moisture content of the flue gas. If the original flue gas parameters remain unchanged and the flue gas temperature at the outlet of the absorption tower changes, the water consumption of the desulfurization system will change greatly. From these influencing factors, we can see the reasons for the imbalance of water balance in the absorption tower. Let's analyze it in detail.

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