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Desulfurization slurry circulating pump is an important core component of absorption tower

Release time:06-05-2018
Abstract:

The desulfurization slurry circulation pump is an impor […]

The desulfurization slurry circulation pump is an important core component of the absorption tower, and the size of its operation output will directly affect the efficiency of the desulfurization slurry circulation pump. The preliminary analysis generally has the following reasons:

1. When the desulfurization slurry circulation pump stops the oxidation fan, the currents of the A, B, C, and D slurry circulation pumps all drop in different degrees. The reason for this is that the desulfurization absorption tower is a vertical counterflow spray tower, and the oxidation air distribution network is arranged. At a height of 5.5m in the absorber slurry pool, the general liquid level is maintained at 9m. The upper part of the slurry pool is an oxygenated air enrichment zone. The shutdown of the oxidation fan causes the upper slurry rich in oxygenated air to be circulated by the slurry circulation pump. The instantaneous increase in air volume reduces the output of the circulation pump, resulting in a decrease in the current of the slurry circulation pump.

Second, desulfurization slurry circulation pump side of the fan joint fan output increase, but also increase the resistance of the slurry circulation pump, resulting in a reduction of the slurry circulation pump current, on the contrary, the guide vanes reduce the internal pressure of the absorption tower to reduce the pressure, the slurry The circulating pump's operating resistance decreases, causing the circulating pump current to increase.

Third, greatly reduce the absorption tower liquid level, making the absorption tower internal pressure drop, but also can make the circulating pump current drop, but it is worth noting that the absorption tower lower liquid level, will affect the desulfurization efficiency, so that the slurry oxidation space is reduced, This affects the quality of the gypsum, which in turn affects the desulfurization efficiency.

Fourth, desulfurization slurry circulation pump inlet filter plug, the current will be reduced, at this time will accompany the import pipeline vibration, processing pressure reduction.

5. The current of the #5 tower slurry circulation pump was found to be reduced in different degrees at 2015.04.01.00.10 in this power plant. In particular, the #5D slurry circulation pump current slurry was about 4A lower (normal 82.3A) and was burned in the boiler at 1250 mg/m3. In the case of low-sulfur coal, the efficiency was only 95.2% (pH of the slurry was 5.5), and there was a lot of foam in the trench of #5 on site. After adding about 400ml of defoamer to #5 tower, #5A, B, C, D slurry The circulating pump current returns to normal (both rise about 4A) while the efficiency rises to 97%:

The preliminary analysis of the desulfurization slurry circulation pump is as follows: #5 The efficiency of electrostatic precipitator dust removal is not high, a large amount of dust enters #5 tower, resulting in serious slurry contamination, especially an electric field 1A1, 2A1 electric field high pressure can not be normal operation, low output, resulting in slurry foam When the volume is increased, when the slurry contains air >3%, the slurry circulating pump output will be greatly reduced, the current will drop, and the ratio of liquid to gas will decrease, which will weaken the absorption capacity of the slurry and cause the desulfurization efficiency to decrease. To avoid such incidents, you should do:

1. improve the efficiency of electrostatic precipitator

2. strengthen dehydration, replacement slurry