Storage and Transportation Technology: [Weekly Topic] November 3–27, 2021 – How to Address Liquid Carryover in the Gas Phase of Unloading Compressors
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This post was last edited by MintLife on 2011-3-22 at 16:16. Liquid in the gas phase of the unloading compressor affects both the compressor and the unloading speed. How can we prevent liquid from entering the gas phase? What are the causes of liquid in the gas phase? What approach should be taken to solve it? Those who actively participate in the discussions will be rewarded.
Equipping with a buffer tank should be able to reduce the occurrence of liquid in the gas phase
Equipped with a buffer tank with liquid separation – good performance
Add a wire mesh to the buffer tank； A enlarged pipeline is designed before entering the buffer tank to reduce the flow rate.
A method for unloading liquid ammonia from a tank truck involves connecting the gas interface and the liquid interface of the tank truck to the respective gas and liquid interfaces of the storage tank. First, a gas compressor draws in air from the storage tank through the gas pipeline and expels it into the tank truck, causing the liquid ammonia inside the tank truck to flow into the storage tank via the liquid pipeline. Once the liquid ammonia in the tank truck stops flowing into the storage tank, the liquid inlet of the storage tank is closed. Then, the gas compressor again draws in air from the tank truck and expels it into the storage tank; under the influence of ambient temperature, the remaining liquid ammonia in the tank truck vaporizes and flows into the storage tank. The gas compressor stops operating once the gas pressure inside the tank truck reaches 0.1 MPa. This invention not only ensures that the environment remains unpolluted but also eliminates the risk of accidents. Moreover, the unloading is more thorough, which is more reasonable from an economic perspective.
Piping heating to increase the superheat of the medium, along with a separation tank
Adding a buffer tank and a heat tracing line yields good results.
The main reasons for liquid entrainment in the gas phase are factors such as the influence of ambient temperature and internal leakage in the valves on the pipeline, which can lead to liquid being present in the gas phase of the unloading compressor. To prevent damage to the compressor, a gas-liquid separator should be installed on the gas inlet pipeline to ensure that only pure gas enters the compressor. At the same time, it is necessary to regularly check whether the valves on the pipelines are leaking internally, especially checks before starting up the system are crucial.
Add a heat exchanger and take good care of it.
A liquid separation tank is installed before the compressor inlet, while a pressure stabilization tank is placed at the compressor outlet. In this way, the gas phase coming out of the spherical tank first enters the liquid separation tank for gas-liquid separation, after which the gas proceeds to the compressor. Once compressed, the gas goes into the pressure stabilization tank, which helps maintain a constant pressure and thus compensates for any insufficient gas flow from the compressor, preventing slow unloading.
Reply to 5# sssycs: I’d like to ask gently, why not take in air from the storage tank, send the gas out to the tank truck, and then have the liquid in the tank truck be connected to the storage tank? ! This should save energy, right? !