【Weekly Topic】Issues with torch exhaust gas settings
Thread Content
For coal chemical projects, in the gasification section using conventional gasification processes (gas flow bed, fluidized bed), the temperature of the gas emitted in case of an accident at the inlet of the shift section is relatively high (usually above 200 degrees)； And the temperature of the exhaust gas after transformation is basically at room temperature. How are the pipelines of the torch gas system typically configured, as is known to everyone? High-temperature gas alone? Is it necessary to cool high-temperature gases? There are rewards for participation!
We are in the petrochemical industry; there is only one pipeline for releasing flare gas
The emission principle for torch exhaust gases is: separation by quality and pressure, with no requirements regarding temperature. If the poster intends to recover waste heat from the \"accidental emissions,\" setting aside the economic viability of adding such waste heat recovery facilities, does the gasification unit experience accidents that result in gas emissions on a daily basis? That level of skill is really low, isn’t it?
There is a misunderstanding. For exhaust gases at high temperatures, whether the pipes are run separately or connected to the main pipeline system, the increased investment required for the pipes is also a factor that must be taken into consideration.
Is 200 degrees of flue gas considered high? The flare gas emitted by a normal gasification unit is at 400 degrees, and no separate pipeline network is required; so how can there be an increase in investment?
Failing to set them separately necessarily means that the design temperature for the entire flare pipeline system must be chosen based on high-temperature media, and this leads to increased costs associated with material selection and pipe stress compensation for the large-diameter pipes used in flare emissions.
The main pipeline of the coal chemical industry’s flare network is approximately DN800 to DN1000 in diameter; I’m not sure how much larger it can be
In the event of an accident, large volumes of flare gas are released over just a few seconds or minutes, through the flare system for safe discharge; it is not possible to determine how much the temperature can be reduced How low can the pipe diameter be reduced? How much can pipeline investment be reduced? No amount of additional savings can compare to the safety of the installation! To reiterate, the torch is a safety measure for the device; if it cannot ensure the intrinsical safety of the device, then it serves no purpose as a decorative element.
Then create two options: one where the high-temperature gas is routed through its own pipeline, and another where it is integrated into the existing pipeline network, with that network being modified in accordance with the standards for high-temperature gases. Which one should be chosen for that economic plan? Calculate it.
I would like to know how this is set up in your company