Low-pressure steam condensation water energy saving system and method for alkane dehydrogenation device

Abstract

The invention discloses a low-pressure steam condensation water energy saving system and method for an alkane dehydrogenation device. The method comprises the following steps: controlling the flow of desalted water according to the temperature and pressure of low-pressure steam condensation water, and fully mixing the desalted water with the low-pressure steam condensation water in a condensation water attemperator so as to cool to 40 DEG C, wherein the cooled condensation water is used as a water source of an efficient compound air cooler of the alkane dehydrogenation device or enters a low-pressure steam condensation water recovery header pipe and is finally pumped out of the device, thus achieving the effect of energy-saving utilization.

Description

technical field [0001] The invention relates to the field of alkane dehydrogenation devices, in particular to a low-pressure steam condensate energy-saving system for alkane dehydrogenation devices. Background technique [0002] The alkane dehydrogenation unit adopts the Oleflex process technology of UOP Company of the United States, and uses liquefied gas as raw material to produce n-butene, MTBE and propylene products. In its production process, liquefied hydrocarbons need to be gasified, and the heat source used is mostly low-pressure steam of 0.35Mpa. However, the pressure and temperature of the condensed water generated are low and cannot be used as a secondary heat source. [0003] The first domestic mixed alkane dehydrogenation device was designed by our company and has been successfully put into operation. However, during the test run, it was found that there were problems with the recovery of low-pressure steam condensate and the piping system. The lowest temperat...

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Problems solved by technology

As we all know, when water hammer occurs, the pressure increase may be many times the normal pressure, causing the pipe wall material to bear a lot of stress; repeated changes in pressure will cause vibration of the pipeline and equipment, and in severe cases, it will cause damage to the pipeline and pipeline accessories. and equipment damage

After observation and research, it is found that the water hammer of the above-mentioned traditional mixed alkane dehydrogenation device occurs after the low-pressure steam trap, at the confluence of the branch pipe and the main pipe. This water hammer problem will affect the safety of instruments, valves and pipelines, and even affect the entire device. long-term operation of

However, the mixed alkane dehydrogenation unit uses a large amount of low-pressure steam as a heat source, which is very different from the current oil refining and petrochemical units. There is no successful experience and case for the recovery and utilization of low-pressure steam condensate

[0004] At the same time, domestic alkane dehydrogenation units use a large number of high-efficiency composite air coolers, which use desalted water as cooling water, but the desalted water will eventually be evaporated and cannot be recycled

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