Causes of water balance imbalance in wet desulfurization absorber
1. Measurement point selection deviation
Selection of measuring points by operators. The selection of liquid level measuring points by the main control personnel directly leads to the deviation between the liquid level and the actual situation (there are two measuring points at the top and bottom of the absorption tower, with a height difference of 2m, and the liquid level can be calculated through the pressure). Through the liquid level selection, 9 kinds of density and liquid level of the absorption tower can be called out. Especially when the deviation of measuring points of the absorption tower is relatively large, the point adjustment leads to a very large liquid level display gap and loses the reference value of liquid level.
2. Human factors
The startup and shutdown of the gypsum slurry pump of the absorption tower is regulated by the desulfurization public area. The gypsum removal depends on the judgment of the gypsum quality on the desulfurization site, and is comprehensively considered from the moisture content of gypsum, the thickness of filter cake, the frequency of belt dehydrator, the density of the absorption tower, etc. Since desulfurization personnel have no standard for gypsum moisture content, it often occurs that the moisture content of gypsum is not high on site and the actual density of absorption tower is lower than the assessment value.
3. False liquid level influence
Incomplete combustion is easy to occur when the unit is started and stopped, and the unburned substances enter the absorption tower, resulting in the increase of heavy metal ions or * substances. Saponification reaction occurs on the liquid level surface of the absorption tower, forming oil film and false liquid level. The design of oxidation air volume is unreasonable, and the increased air volume flows to the slurry surface in the form of bubbles, which will cause the difference between the liquid level conversion and the actual situation.
4. Affected by the start and stop of slurry circulating pump
The slurry circulating pump belongs to the step-by-step lifting pump group, and the output of the pump group is different. Due to the frequent change of purchased coal, the rapid change of inlet sulfur, and the number of startup and shutdown of slurry circulating pump, it has a great impact on the water level display of absorption tower.
(1) Influent influence of absorber
1) Mist eliminator flushing is the main water inflow of the absorption tower. In order to ensure the effect of the mist eliminator and avoid the increase of the differential pressure of the mist eliminator, scaling and even collapse, it is generally controlled to flush twice in 8 hours, which belongs to the controllable range.
2) The desuperheating water at the outlet of the oxidation fan and the desuperheating water at the outlet of the oxidation fan are kept open and are not adjusted during operation. This part of desuperheating water is controllable.
3) Slurry supply of absorption tower. By increasing the slurry supply to maintain the discharge value at the outlet, the slurry supply is too large and the liquid level of the absorption tower is increased.
4) The process water and cooling water tank spray the absorber twice a day. Due to the short time, the flow can be ignored.
(2) Influence of absorber effluent
1) Evaporation capacity of absorption tower. The flue gas temperature at the inlet of the absorption tower has a great impact on the liquid level in the absorption tower. The higher the flue gas temperature, the greater the evaporation of the slurry in the absorption tower. This is closely related to the smoke exhaust temperature, coal type and the operation of low-temperature economizer.
2) Gypsum removal from absorption tower. The recovered water produced after gypsum removal from the absorption tower returns to the tower again, and the returned water is slightly lower than that brought out by gypsum removal, which is controllable.
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