Hydrorefining salt formation treatment
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Our unit is capable of 800,000 tons of refined hydrogenation, with a high-pressure level of 6.2 MPa. It consists of hot high-pressure and low-pressure sections, as well as cold high-low pressure sections. The feed temperature for the hot high-pressure section is 167 degrees. Given the high pressure difference in the system, it is planned to inject water at the heat exchanger before the hot high-pressure section; after injection, the water passes through the hot high-pressure section and then to the hydraulic turbine, from where it goes to the low-pressure section. There, it enters a stripping tower for water separation, with a pressure of 0.54 MPa in that tower. Inquiry: There are potential hazards and risks associated with water injection
The pressure and liquid level in the stripping tower are likely to experience severe fluctuations.
1. OP, doesn’t your unit separate water at the high-temperature cold fraction and the low-temperature cold fraction? 2. Can this water enter the stripping tower and be flashed away? If it enters the distillation tower, could it cause the bottom circulation pump to experience vacuum? 3. Are the hydraulic turbines for separating high- and low-temperature fractions effective? The processes might differ, and the understanding may vary.
The temperature in the hot high-pressure section is 6.2 MPa and 167°C; only a small portion of the water should reach the cold high-pressure section, while most of it will remain in the hot high-pressure section and flow into the hot low-pressure section as well as the stripping tower. Consult a colleague who has encountered similar issues!
1. Water is injected into the high-pressure heat exchanger before the thermal high fractionator; the gas phase from the thermal high fractionator enters the cold high fractionator, where the injected water is carried down to the thermal low fractionator. The oil and water from the thermal low fractionator then enter the stripping tower — distillation tower. The temperature at the bottom of the stripping tower is 165 degrees, so complete flashing is definitely not possible. Are there any other issues besides vaporization by the top pump after water injection?