Engineering Script

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Description	<div><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;">Hot condensate is a target for energy recovery. If the pressure is high, steam can be recovered by installing a flash drum to recover the required steam pressure. The unrecoverable energy is recovered as depressurized condensate.</div><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><br>If it is not recovered with flash steam, it may cause hammering in the condensate pipe at the downstream end, so installing and operating a flash drum is essential.</div><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><br><h2 style="margin: 0px; position: relative; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-weight: bold; font-stretch: normal; font-size: 14px; line-height: normal; font-family: "Trebuchet MS", Trebuchet, sans-serif; color: rgb(0, 0, 0);"><span style="font-family: Consolas;">Formula of LMTD</span></h2></div><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><br>Amount of flash steam generated by hot condensate can be calculated using the following formula:</div><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><br><b>mfs = mc(hc-hfc)/(hfs-hfc)</b></div><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><b><br></b></div><span style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><b><div class="separator" style="clear: both;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNazM7G2iAOAb3ijXECL7wQkXumK7lQOeyP6M2FioTWXckRZs-fDZVlUNIU487xJHjl7WjtwEBwMgO-nV_pzVzkPRRHjEhXGjiqYgYpzzXttYojpk_SmSx3050Iw1JXLHpFLvs34LCMU4pZwk5EJHBdrzykPVbSt89o1yB__W6JHkq8qx_XGbfK_Bx53w/s556/flashflow.png" style="color: rgb(209, 102, 63); margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="556" data-original-width="525" height="358" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNazM7G2iAOAb3ijXECL7wQkXumK7lQOeyP6M2FioTWXckRZs-fDZVlUNIU487xJHjl7WjtwEBwMgO-nV_pzVzkPRRHjEhXGjiqYgYpzzXttYojpk_SmSx3050Iw1JXLHpFLvs34LCMU4pZwk5EJHBdrzykPVbSt89o1yB__W6JHkq8qx_XGbfK_Bx53w/w338-h358/flashflow.png" width="338" style="border-width: initial; border-style: none; position: relative;"></a></div><div class="separator" style="clear: both;"><br></div></b></span><span style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;">Here,<br>mfｓ<span style="white-space: pre;"> </span>: Flash Steam Flow Rate (kg/h)<br>mc<span style="white-space: pre;"> </span>: Condensate Load (kg/h)<br>hc<span style="white-space: pre;"> </span>: enthalpy of condensate (kcal/kg)<br>hfs<span style="white-space: pre;"> </span>: enthalpy of flash steam (kcal/kg)<br>hfc<span style="white-space: pre;"> </span>: enthalpy of saturated water (kcal/kg)</span><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><br></div><h2 style="margin: 0px; position: relative; font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-kerning: auto; font-optical-sizing: auto; font-feature-settings: normal; font-variation-settings: normal; font-variant-position: normal; font-weight: bold; font-stretch: normal; font-size: 14px; line-height: normal; font-family: "Trebuchet MS", Trebuchet, sans-serif; color: rgb(0, 0, 0);"><span style="font-family: Consolas;">Python code</span></h2><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><br></div><p style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;">The following is a Python example where 100 lb/hr of hot condensate is introduced into a flash drum at a pressure of 120 psig and flashed with 60 psig steam, and approximately 4.91 lb/hr is recovered as flash steam.</p><span style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><div><div><span style="color: rgb(43, 0, 254);">from pyXSteam.XSteam import XSteam</span></div><div><span style="color: rgb(43, 0, 254);"><br></span></div><div><span style="color: rgb(43, 0, 254);">steamTable = XSteam(XSteam.UNIT_SYSTEM_FLS) # ft/lb/sec/°F/psi/btu</span></div><div><span style="color: rgb(43, 0, 254);"><br></span></div><div><span style="color: rgb(43, 0, 254);">def flash(mc, Phc, Pf):</span></div><div><span style="color: rgb(43, 0, 254);">    </span></div><div><span style="color: rgb(43, 0, 254);">    hc = steamTable.h_pt(Phc+14.696, steamTable.tsat_p(Phc + 14.696) - 1)</span></div><div><span style="color: rgb(43, 0, 254);">    hfs = steamTable.h_pt(Pf+14.696, steamTable.tsat_p(Pf + 14.696) + 1)</span></div><div><span style="color: rgb(43, 0, 254);">    hfc = steamTable.h_pt(Pf+14.696, steamTable.tsat_p(Pf + 14.696) - 1)</span></div><div><span style="color: rgb(43, 0, 254);"><br></span></div><div><span style="color: rgb(43, 0, 254);">    return mc (hc - hfc) / (hfs - hfc)</span></div><div><span style="color: rgb(43, 0, 254);"><br></span></div><div><span style="color: rgb(43, 0, 254);">print("flash steam flow = ", flash(100, 120, 60)) # 100 lb/hr, 120 psig, 60 psig</span></div></div><div><br></div>When run the code, you get the results below.</span><div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><span style="color: rgb(43, 0, 254);"><br></span><div><span style="color: rgb(43, 0, 254);">flash steam flow =  4.91</span></div></div></div>