How to select instruments for the renovation of a by-product steam hydrochloric acid furnace?
Thread Content
This post was last edited by denghl on 2011-9-24 17:59 (Note: The issue with this topic has been resolved.) But technology has no end; those who are interested can continue to discuss these issues, especially regarding the drum level – I think different people will have different opinions on this. Industrial and domestic boilers are widely used, but you have your own preferred product. September 24, 2011) The overall selection of instruments has been determined, but there are several issues that remain unresolved: 1. What type of control valve should be used for regulating the chlorine flow rate into the synthesis furnace? There are three options; I’m not sure which one is the most suitable: a. HaC bellows control valve ； b. HaC valve core ordinary control valve ； c. PTFE bellows control valve. (Note: The price ratio of the three is approximately 7:5:3; the operating pressure is 110 kPa, and it is dry chlorine under normal conditions.) 2. How should a remote level transmitter for the boiler drum be selected? The original design called for two dual-capillary differential pressure transmitters to measure the liquid level, but we found this unreasonable. Process conditions: 195°C, 1.0 MPa, height 600 mm. My idea: One unit will use a two-chamber balanced container + EJA110A... while the other unit will use an electric float level gauge. Is that okay? What is the best combination then? 3. Analyzer for measuring 31% hydrochloric acid concentration and ORP (Mettler): Inpro7250, Pt4805 – what type of sleeve and measurement cell are suitable for these electrodes? (It’s better to have photos from the scene!) I hope that colleagues with similar experience in use, similar chemical processing equipment, or similar selection experiences can provide their insights for my reference ； If you are aware of any models of valves, level gauges, and analyzers of similar types used in your company, as well as their usage patterns, we would appreciate it if you could share this information with us. The manufacturer has determined that orders must be placed within three days; there is still a good opportunity to make a choice. We look forward to your valuable suggestions. Thank you!
For control valves, I think PTFE bellows control valves offer good cost-performance. HaC is too expensive.
It’s a pity the discussion didn’t go any deeper. The final solution is as follows: 1. The chlorine control valve shall use a PTFE bellows ； 2. The drum liquid level shall follow the original design, with silicone oil of the high-temperature type (300 degrees). The designers said there’s no problem with the application, and they also took into account that making design changes is complicated (not only from a technical perspective). From what I understand, guided wave radar, float level gauges, magnetic flap level indicators, and radio frequency admittance sensors are all excellent options for measuring the level of liquid in a drum. I personally prefer guided wave radar, but my efforts to use it were not successful. 3. For ORP, the M420 transmitter, InPro4800i electrode, InFit761 sheath, and PVDF weld seat are used. It’s my first time using such a luxurious setup. The electrodes are said to be excellent – not only are they intelligent, but one electrode can simultaneously measure ORP and pH. Furthermore, as it is a retrofit project, the selection process took into account the interchangeability of the new instruments and spare parts. As long as performance reliability is ensured, I like to try new things.
Which hydrogen chloride synthesis furnace do you use? Actually, for the gas tank section, all that’s needed is a differential pressure transmitter connected via pressure transfer pipes