Regarding the temperature and pressure reduction controller
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The process proposes an idea to eliminate steam vent valves at all levels; when the pipeline network is under overpressure, a temperature-reducing pressure regulator is used to release pressure to the lower-level steam pipelines, with only low-pressure steam vent valves being retained. I would like to ask the experts: I’m not sure how to implement such a function.
The difficulty and feasibility of this issue lie in the process engineering field. It’s not a gauge. First question: Is it possible to do this? The protection of the vent valve takes precedence over control. This one is probably going to be directly passed
The maximum volume of steam that can be released through the valves at each level needs to be calculated. For example, the capacity of the lower-level steam networks at pressures of 3.5MPA–2.2MPA and 2.2MPA–1.0MPA must also be determined, so that they can handle the amount of steam discharged into those networks using temperature reducers and pressure regulators.
1. Installing temperature and pressure reducers can improve the efficiency of steam usage and reduce unnecessary emissions； 2. The emission requirements under specific operating conditions cannot be ignored; in addition to installing vent valves, safety valves are also necessary ； 3. By means of the hierarchical control provided by the pressure controllers for high and low-level steam pipelines, it is possible to reduce the pressure of steam in the lower-level pipelines ； 4. All modifications must be designed and cost-checked by the design institute to meet regulatory requirements ； Consider the investment benefits of technological upgrades at the same time ； 5. The attachment shows the application of steam control in a grade-4 steam network; DS denotes a temperature and pressure reducing valve, for reference only.
This post was last edited by wdq245 on 2019-4-4 at 10:45. The lower-level steam pipeline network must have sufficient capacity, so that the safety valves can release pressure to the lower level. Safety valves serve a protective purpose and must not be removed!
As long as the process works, that’s fine – the process is the most important factor; once the process gives instructions, the instrumentation has to work hard to carry them out. The process should come up with a simple control plan, and then we can proceed with it. What was said upstairs is correct: safety valves must not be omitted, and interlock designs should be implemented where necessary. That’s all. Without a control scheme based on established processes, we cannot design the instruments arbitrarily……
Eliminating fluctuations in low-grade steam users is another challenge