Improved method of purifying gas containing urea dust
A urea and dust technology is applied in the field of improved purification of urea-containing dust gas to achieve the effect of reducing ammonia emissions, low energy consumption and small emissions
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[0030] Example 1:
[0031] figure 1 The middle is the principle flow chart of using scrubber to purify all tail gas. The raw material urea melt is at a temperature of about 134 to 138°C, 97-85% of the amount is sent to the large particle urea device 1 through the urea melting pump 4, and 3 to 15% is sent to the urea granulation tower 3 . The small granular urea with a temperature of about 45-60°C at the bottom of the prilling tower 3 is sent to the large granular urea device 1 as a seed crystal, and is contacted with the urea melt sent by the urea melting pump 4 to produce a large granular urea product. The scrubbing tower 2 receives the tail gas containing urea dust from the prilling tower 3 and the large-particle urea device 1, and is discharged to the atmosphere after being washed. The hydrogen and ammonia-containing tail gas 6 from the urea plant can also be sent to the scrubber to be washed and discharged. Since the large-particle urea device used in the present invention i...
Example Embodiment
[0032] Example 2:
[0033] figure 2 It is a process in which a scrubber is used to purify all the exhaust gas, and the product contains both large-particle urea and small-particle urea. The difference from Example 1 is that the amount of urea melt that enters the prilling tower from the raw urea melt pump 4 is relatively large, and the amount of small granular urea produced is greater than the number of seeds required by the large granular urea device, which will be more Small granular urea is delivered as a product.
Example Embodiment
[0034] Example 3:
[0035] image 3 It is a process in which a scrubber is used to purify part of the exhaust gas, and all the products are large granular urea. The difference from Example 1 is that the gas in the prilling tower 3 is vented directly and no longer enters the scrubbing tower 2.
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