Extra: Drum pressure control

One circuit of low-pressure steam for regulating the outlet pressure; one circuit of medium-pressure steam for regulating the drum pressure; one circuit of circulating water for regulating the drum liquid level; one circuit of high-pressure steam that enters the drum after passing through the turbine. When high-pressure steam enters the drum, the pressure becomes excessively high; therefore, it is necessary to open the low-pressure control valve to release the steam. Low-pressure steam can no longer be controlled automatically. What solutions are available to enable automatic control of both low-pressure and medium-pressure steam at the drum pressure level? First of all, is the steam generated by your boiler medium-pressure steam? For now, I understand it as a medium-pressure boiler that produces low-pressure steam, with the outlet pressure being regulated in a single circuit. My understanding is that this is a branch of the medium pressure in the steam drum, and the pressure is reduced to produce low-pressure steam; there seems to be no disagreement on this point. The pressure of the steam is regulated in a single circuit using medium-pressure steam; from what I understand, the drum pressures I’ve seen don’t have any regulating mechanism – they only provide a measurement value. Could it be that the boilers I’ve seen were all of medium pressure, around 3.5 MPa? ! With circulating water throughout, the drum level is controlled via a single loop; as far as I understand, our drums are all under three-input control, so there shouldn’t be any major issues with adjusting the level using just a single loop. High-pressure steam flows through the turbine and then into the drum. My understanding is that the high-pressure steam is used by the turbine to generate power; the resulting low-pressure steam, in my view, cannot enter the drum directly – it needs to be condensed into water first and go through a series of devices before it can reach the drum. Perhaps I don’t understand your manufacturing process well, and it seems a bit chaotic in terms of control. Can I get a DCS screen or a PID flowchart?

Why do I think drum boilers are used for generating steam? It seems to me that yours is only used for pressure regulation – three streams of steam go in, and one stream of steam at a regulated pressure comes out? If that’s really the case, then you’ve really confused everyone upstairs; this certainly isn’t a steam drum……

Our gas is supplied from outside; we do not generate steam on our own – the steam comes from the branch offices and is sent to us for use. Previously, only medium and low pressure control was used. Now, since turbines need high-pressure steam, that steam must enter the steam drum, and there is no regulation of this high-pressure steam, which can result in excessively high pressure in the steam drum. Hence, there was a conflict between the medium and low pressure control systems earlier

Our high-pressure steam does not pass through any control devices; it goes directly from the steam turbine to the steam drum. The three streams of steam are all in separate pipelines; the steam from the drum exits into the production system, while the low-pressure steam enters both the drum and the production system. Steam for production entering via two routes.

The last edit to this post was made by 200878290 on 2017-5-14 at 15:28. The equipment is already running; it generates millions per day, and we’re welding tanks non-stop – there’s no way to stop it. I wasn’t the one who designed it; this problem arose after the turbine started operating. Now that production has increased and the turbine is running, they’re blaming me. The situation is critical