Selection of acidic water stripping process

The single-tower full extraction process is simple, requires fewer pieces of equipment, results in lower investment costs, and has lower energy consumption. Compared to conventional pressure stripping, single-tower pressure stripping involves more complex operations and requires slightly higher energy consumption. The advantage, I think, is mainly the ability to recycle ammonia from industrial products; for refineries, they can handle the issue of injecting ammonia at the top of the upstream units on their own. Additionally, the remaining portion can also be sold as a product. The key is the issue of operating costs; the price of liquid ammonia doesn’t seem to be very high either, so there should be a surplus in this area. I think even if there is a profit of just one yuan, ammonia purification is still necessary. In this way, significant savings can also be achieved in the capital investment for sulfur treatment equipment.

PS: Borrowing the OP’s thread to ask a question: The new coking units that were put into operation this year reportedly contain a large amount of coke dust in their sulfur-containing wastewater, which has a significant impact on the wastewater stripping process. I wonder if anyone has any good experiences. My acid water production facility has a capacity of 800,000 tons per year, with two raw water tanks of 2,000 m3 each, one of which is equipped with a secondary tank. Single-tower pressurized side-stream extraction process.

The economics of recovering ammonia versus not recovering it should be calculable.

The single-tower atmospheric full-blow stripping process has been adopted by an increasing number of enterprises due to its simplicity and low system pressure. However, the drawback of this process is that it is not possible to recover the ammonia contained within it, and the sulfur recovery unit must have the capability to burn ammonia.

The single-tower atmospheric full-blowoff stripping process is simple, but since all of the ammonia is burned, it increases refining losses. Therefore, Sinopec now requires that new installations must have an ammonia recovery system. Overall, there is not much emphasis placed on acid water stripping systems in China at present; the introduction of an ammonia recovery system increases the risk associated with such installations. It is not recommended to use an ammonia recovery system in facilities where there are no refining losses

The ammonia extracted through the side line is said to have an unpleasant odor and is not easy to sell, so the atmospheric pressure full-blowout process is currently more popular.

When ammonia has no outlet, single-tower full stripping is used. We also use a single-tower full-blowoff stripping process. Now we want to add alkali to the stripping tower in order to reduce the ammonia nitrogen content in the purified water; we’re not sure where would be the best place to add the alkali. Could any expert provide a ready-made solution?

The ammonia extraction process using a single tower with a side line is better; the purified water obtained from the constant-pressure full-blowing stripping process in a single tower does not easily meet the required standards.

Going back to the 8th floor: our acidic water stripping unit here uses a alkali injection process in the dual-tower stripping system; the alkali is injected around the middle of the ammonia stripping tower, at a concentration of approximately 30%.

Isn’t cleaner production required these days? Under environmental pressure, some companies still have to extract ammonia through side streams in order to ensure that the ammonia nitrogen levels in the treated water meet the specified standards.

I think we still need to consider selling ammonia; if sales are good, we can consider installing a side stream on a single tower. In winter, the liquid ammonia produced by our plant’s single-tower stripping unit has no place to be sent; it can only be mixed with water to form ammonia water before being discarded. Winter in Xinjiang lasts for 5 months, and discarding ammonia water pollutes the environment while also resulting in high energy consumption. For newly installed units, single-tower stripping has been changed to full extraction.

The double-tower stripping process is relatively good

Aren’t the purposes of treating acidic water and recovering sulfur both aimed at environmental protection? In the long run, extracting ammonia from acidic water and recovering sulfur reduces the load, and moreover, the flue gas combustion furnace also decreases energy consumption

The investment in equipment for the single-tower full-exhaust process is relatively low