Flow regimes and pressure drop of a composite tridimensional rotational flow sieve tray under concurrent gas--liquid flow

A new type of composite tridimensional rotational flow sieve tray is proposed. The flow pattern and operation domain of the tray were defined and divided by the image shooting method, combined with the standard deviation of the pressure difference sequence. There are membrane–drip column and foam–embolic flow in the TRST area of the internal packing–type tray, while bubbly and milk froth-ribbon flow are present in the packing area of the external packing-type tray. This study focused on the influence of the tray structure parameters on the pressure drop. Under the experimental operating conditions, the dry pressure drop was within 160 Pa, while the wet pressure drop was within 900 Pa. Under the same structural parameters, the internal packing–type pressure drop of the tray was higher than that of the external packing-type tray. A mathematical model of the pressure drop between dry and wet trays was established.

Experimental Study of the Influence of Gas Flow Rate on Hydrodynamic Characteristics of Sieve Trays and Their Effect on CO2 Absorption

An experimental study was conducted in the sieve tray column to investigate the influence of gas flow rate on the hydrodynamic characteristics of the sieve tray, such as total tray pressure drop, wet tray pressure drop, dry tray pressure drop, clear liquid height, liquid holdup, and froth height. The hydrodynamic characteristics of the sieve tray were investigated for the gas/water system at different gas flow rates from 12 to 24 Nm3/h and at different pressures of 0.22, 0.24, and 0.26 MPa. In this study, a simulated waste gas was used that consisted of 30% CO2 and 70% air. The inlet volumetric flow rate of the water was 0.148 m3/h. The temperature of the inlet water was 19.5 °C. The results showed that the gas flow rate has a significant effect on the hydrodynamic characteristics of the tray. The authors investigated the effect of changing these hydrodynamic characteristics on the performance of a tray column used for CO2 capture.

Evaluasi Neraca Massa Kolom Deethanizer di Unit Gas Plant

Gas Plant Unit in company X engaged in energy in Balikpapan has a design capacity of 560 tons/day. This unit serves to produce propane gas (C3H8) and butane (C4H10) to become LPG products. The Deethanizer column is a Light End fractionation unit that separates Ethane compounds from Propane and Butane at operating temperature resulting in LPG products that meet the specifications. The researcher's goal is to obtain the actual mass balance calculation and the flow rate of the process—the method used from retrieving data on operating conditions directly to the industry and performing calculations. The Deetanizer column is composed of 40 sieve trays, the entry feed of the 20th tray operates at the mass flow rate of the Deethanizer column feed of 5949,184 kg/hour, the flow rate of LPG products is 3428,334 kg/hour, and the mass flow rate of gas overhead is 150,186 kg/hour so that there is an actual % loss of 39,84%, this is because this unit should be time to be repaired. However, this does not affect the products produced, which can be seen from laboratory tests on LPG product samples.ABSTRAKGas Plant Unit diperusahaan X yang bergerak dibidang energi di Balikpapan mempunyai kapasitas desain 560 ton/hari. Unit ini berfungsi untuk memproduksi gas propane (C3H8) dan butana (C4H10) sehingga menjadi produk LPG. Kolom Deethanizer adalah unit fraksinasi Light Ends yang berfungsi untuk memisahkan senyawa Ethana dari Propana dan Butana dengan proses destilasi bertekananan sehingga menghasilkan produk LPG yang memenuhi spesifikasi. Tujuan peneliti untuk mendapatkan perhitungan neraca massa aktual serta laju alir proses. Metode yang digunakan dari pengambilan data kondisi operasi langsung ke industri serta melakukan perhitungan. Kolom Deetanizer tersusun dari 40 buah sieve tray, umpan masuk dari tray ke-20, beroperasi pada laju alir massa umpan kolom Deethanizer sebesar 5949,184 kg/jam, laju alir produk LPG sebesar 3428,334 kg/jam dan laju alir massa overhead gas sebesar 150,186 kg/jam sehingga diperoleh % yield aktual 57.62 dan % losses aktual sebesar 39,84%, hal ini disebabkan karena unit ini seharusnya sudah waktunya untuk di perbaiki. Namun hal ini tidak berpengaruh terhadap produk yang dihasilkan, hal ini dapat dilihat dari hasil uji Laboratorium mengenai Sampel Produk LPG.