Method and device for reducing temperature of high-pressure depropanization tower kettle of ethylene unit
A high-pressure depropanizer and ethylene unit technology, applied in organic chemistry, distillation purification/separation, etc., can solve problems affecting the normal production operation of ethylene units, response lag, poor effect, etc., to reduce the risk of coking blockage, reduce The effect of kettle temperature and stable operation
Pending Publication Date: 2021-10-26
SINOPEC ENG +1
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Problems solved by technology
The addition of polymerization inhibitors can alleviate the coking of trays and reboilers, but this method often responds hysteresis, or sometimes has poor results
At this time, it will affect the normal production and operation of the ethylene plant
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[0032] This example is used to illustrate the method and device for lowering the temperature of the high-pressure depropanizer tank of an ethylene plant according to the present invention.
[0033] Such as image 3 As shown, the present invention provides a kind of method that reduces the temperature of high-pressure depropanizer tower kettle of ethylene plant, and this method comprises; The gas in the reflux tank of the high-pressure depropanizer enters the cryogenic system of the demethanizer and enters the pre-demethanizer after being cooled. The kettle material is sent to the deethanizer, and the gas phase at the top of the tower is sent to the demethanizer, and the mixed carbon three parts of the tower bottom material of the deethanizer are introduced into the high-pressure depropanizer, so that the temperature of the high-pressure depropanizer tower bottom is controlled at 80°C the following. The introduction position of the mixed C3 on the high-pressure depropanizer i...
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The invention belongs to the technical field of ethylene production devices in petrochemical industry, and discloses a method and a device for reducing the temperature of a high-pressure depropanization tower kettle of an ethylene unit. A tower top material of the high-pressure depropanization tower is subjected to heating, compression, C2 hydrogenation and cooling and then enters a high-pressure depropanization tower return tank, gas in the high-pressure depropanization tower return tank enters a demethanization tower cryogenic system and then enters a pre-demethanization tower after being cooled, liquid in the high-pressure depropanization tower return tank flows back to the high-pressure depropanization tower, the tower kettle material of the pre-demethanization tower is sent to a deethanization tower, the tower top gas phase is sent to the demethanization tower, the tower kettle material mixed C3 part of the deethanization tower is introduced into the high-pressure depropanization tower, and the tower kettle temperature of the high-pressure depropanization tower is controlled to be 80 DEG C or below. According to the method and the device, the kettle temperature of the high-pressure depropanizing tower can be controlled, so that the operation of the high-pressure depropanizing tower reaches the designed temperature, and the phenomenon that a tower plate and a reboiler are coked and blocked is avoided while the product purity is ensured.
Description
technical field [0001] The invention belongs to the technical field of ethylene production devices in petrochemical industry, and in particular relates to a method and a device for reducing the temperature of a high-pressure depropanizer tank of an ethylene device. Background technique [0002] An ethylene production unit adopts the separation process of pre-depropanization, the specific separation process is as follows figure 1 , 2 As shown, cracking raw material 1 enters quenching oil tower 3 after being cracked by cracking furnace 2, and the tower kettle of quenching oil tower 3 obtains cracking fuel oil 10, and the middle part obtains cracking diesel oil 9, and the tower top material is sent into quenching water tower 4, and quenching water tower 4 The tower kettle obtains pyrolysis gasoline 8, and the tower top material enters the pyrolysis gas compressor (1, 2, 3, 4 sections) 5 compressions and is sent to the alkali washing tower 6, and the alkali washing tower 6 towe...
Claims
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IPC IPC(8): C07C7/04C07C11/04
CPCC07C7/04C07C11/04
Inventor 白宇辰王振维赵百仁雷正香
Owner SINOPEC ENG