What are the determining factors affecting the chimney height after flue gas desulfurization in catalytic cracking?

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Affected by the development of coal-fired boilers, catalytic cracking flue gas desulfurization is also moving toward \"ultra-low emissions.\" At present, the pollutant content in the purified flue gas is very low. The question that needs to be addressed is: what factors determine the height of the chimney after catalytic cracking flue gas desulfurization, once the pollutant content in the purified flue gas has been reduced? It turns out that the **Standard for Comprehensive Emission of Air Pollutants (GB16297-1996)** not only controls the concentration of pollutants in the flue gas after purification but also regulates the absolute amount of pollutants emitted. The emission height of the purified flue gas can be determined based on this absolute emission amount. After the release and implementation of the new standard, the \"Emission Standards for Pollutants in the Petroleum Refining Industry\" (GB31570-2015), only limits on pollutant concentrations are specified; there are no requirements regarding the total amount of emissions or the height at which they are emitted. It is also stated that the relevant provisions of the previous standard, the \"Comprehensive Emission Standards for Air Pollutants\" (GB16297-1996), are no longer applicable. How should we understand this? Can it be understood that implementing the pollutant concentration requirements of the new standard, the \"Emission Standards for Pollutants in the Petroleum Refining Industry\" (GB31570-2015), alongside the emission limits specified in the original standard, the \"Comprehensive Emission Standards for Air Pollutants\" (GB16297-1996), isn’t reasonable either? I invite all experts to discuss together: what are the determining factors for the chimney height after flue gas desulfurization in catalytic cracking? Thank you.