The acid production process using zinc concentrate flue gas generates heavy smoke; online particle levels are above the allowed limits – a solution is needed
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Our plant produces acid from zinc concentrate flue gas through a process that includes a first-stage dynamic wave reactor, a cooling tower, a second-stage dynamic wave reactor, electrostatic mist removal, two-stage washing, and four-stage conversion. Complemented by hydrogen peroxide-based flue gas desulfurization. Since the system was restarted after major maintenance, it has been emitting a lot of smoke. Another major repair was carried out after 6 months, yet the vehicle still emitted a lot of smoke from its exhaust. Moreover, online monitoring shows that particle levels are above the limit. The cause has not been found yet. It is now suspected that acid mist is affecting the online monitoring probes, causing them to indicate excessive particle levels (excessive smoke); however, the electrostatic mist treatment improves the performance of these probes. However, the reason for the heavy exhaust smoke has not been identified yet. There’s no problem with the moisture level.
How is the monitoring of SO2 and SO3 in exhaust gases? What’s the conversion rate like?
Online monitoring shows sulfur dioxide levels below 50 mg; sulfur trioxide cannot be measured
The absorption rate is fine, right? What is the inlet temperature of the tail suction tower? Could it be water vapor?
Find a sampling port at the outlet of the second absorption tower and open it to check for acid mist. Also, does the hydrogen peroxide tail suction have a charged mist eliminator?
Excessive particulate matter levels may be caused by poor demisting performance of the desulfurization tower
Environmental online particulate matter detection uses the transmittance method: acid mist affects transmittance, leading to excessive levels of particulate matter. 2: When the temperature at the top of the desulfurization tower reaches the dew point, it leads to excessive levels of particulates. 3: Excessive particulate levels may be caused by poor demisting performance in the desulfurization tower
There might be a problem with the concentrated acid pump; the amount of spray is insufficient
This post was last edited by in the blink of an eye on 2019-5-22 at 20:38. We had a similar situation here: a mineral acid production facility was experiencing excessive particulate levels. After replacing the mist remover in the second absorption tower with an imported high-performance mist remover (CS-IIP plus), the issue of excessive particulates was resolved after the plant was restarted. Related link: The impact of the performance of dry-suction fiber mist eliminators on exhaust particulates https://bbs.hcbbs.com/thread-2164739-1-1.html