High-pressure flash tank

This is the explanation from Baidu: When saturated water at high pressure enters a container with lower pressure, the sudden drop in pressure causes this saturated water to turn into saturated steam and saturated water at the pressure of that container. In actual production, the role of high-pressure and high-temperature liquids entering the high-pressure flash tank is to reduce their temperature and pressure through flashing, thereby separating the gases contained in those liquids. The cooled water is recovered for reuse, while the gases are released through pipelines to be burned in a flare. The separated gases contain substances such as hydrogen sulfide and ammonia, which helps to reduce the levels of sulfur and ammonia in the gasification water system. As a result, indicators such as ammonia nitrogen and COD in the gasification ash water are decreased, thereby facilitating the operation of the gasification system. A high-pressure flash tank does not require a liquid level to be maintained ； The pressure in the gasifier when switching from low flash to high flash is around 1.0 MPa. I hope this is the answer the original poster is looking for.

The answer I got from my master today is that when the level of a liquid with a high flash point is too low, this water is used to raise the level; under normal conditions, this water isn’t needed. Thank you for your answer :)

It is necessary to establish a liquid level, because in the low-pressure flasher that follows the high-pressure flasher, the absence of a liquid level may cause the high-pressure syngas to flow into the low-pressure flasher. The condensate may enter the high flash tower in order to make use of this condensate, as there is no other place for it to go; that was the original intention behind the design of our facility.

May I ask if the condensate from your facility is connected to the high flash pipelines for each series?

I don’t quite agree with your view; however, it’s possible that the processes are different. In my facility, the high-pressure condensate tank has only one pipeline leading to the A high-pressure flash tank. If a level control system is needed, is it only necessary for the A high-pressure flash tank? Don’t we need the other two series? Moreover, from the time of startup until now, the liquid level has never been established using water from this route; pressure fluctuations between high and low levels occurred. In fact, at the beginning of operation, when the pressure reached that of the high-pressure flash tank, water from the vaporizer was used to establish the liquid level. I believe this pipeline is used for drainage; in the event of an accident where the high-pressure condensate pump fails and water cannot be pumped out, this valve is opened to allow the high-pressure condensate to flash, after which it flows into the true flash backset tank to be added to the ash water for reuse. It can resolve the issue of water supply to the scrubber in the absence of high-pressure condensate for a short period of time, while carrying out emergency repairs on the high-pressure condensate pump. One way to achieve this is to allow some of the toxic and harmful gases to evaporate when the equipment is delivered, as the high-pressure condensate contains such gases, and this process enables a portion of them to flash off. The above are my personal thoughts. If there are any objections, we can discuss them further

This pipeline is not used to establish the liquid level. The explanation is divided into several layers. 1: High flash requires a liquid level to be established. 2: The use of condensate is optional on our end. What you mentioned later about the possibility of toxic gases is also very likely; I hadn’t thought of that before, thanks for letting me know, :)

What was said on the 2nd floor is correct; we are at level 3 flash true, and the vaporization pressure is usually 3.0 when at high flash