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.
1、 Factors affecting water balance of wet desulfurization absorber
1. Sulfur in coal
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. Gypsum dehydration
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. Filtrate backwash
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. Flue gas temperature at the outlet of absorption tower
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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