(Daily Question) Coal-to-Oil and Olefins Forum, 2018.2.7
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3.jpg Participation: Prize of 5 Wealth； Correct answer: Reward of 10 wealth points ； Note: This post is valid for 48 hours. Question: During the preparation for commissioning of the (DMTO) olefin separation unit, how is circulation carried out in the propylene distillation column? After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa ； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare. Note: The answer will be announced automatically in two days!
Answer: After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
(1) Introduce gaseous propylene and pressurize to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare
After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare
After the replacement and airtightness testing of the propylene distillation tower are completed, (1) gaseous propylene is introduced to pressurize the system to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
(1) Introduce gaseous propylene and pressurize to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.
(1) Introduce gaseous propylene and pressurize to around 0.6 MPa； (2) Liquid propylene is introduced into the propylene distillation tower, and the reboiler at the bottom of the tower is heated and pressurized gradually ； (3) Use the circulating water control valve and flare valve of the tower top condenser to regulate the tower pressure, while venting non-condensable gases ； (4) After the liquid level is established in the reflux tank, start the reflux pump to carry out full reflux operation ； (5) Sample the non-condensable gas content at the top of the reflux tank for analysis; once it meets the requirements, stop venting to the flare.