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On January 2, the first day of work after the New Year's Day, the cracking workshop of Qilu Petrochemical Olefin Plant's cracking workshop continued to test the current situation of complex cracking system and unstable consumption of ethane, the raw material for cracking, to seek the best hourly dosage of ethane.
The measures taken by the olefin plant to deeply optimize the feedstock to increase the production of ethylene
.
Environmentally friendly unloading and effective recycling
Environmentally friendly unloading and effective recyclingWith the rise in raw material prices and the decline in products, the profit margins of enterprises have been greatly compressed.
What should we do? This severe situation is in front of all the cadres and employees of the olefin plant.
We must do everything possible to optimize the raw materials and increase the production of ethylene in order to reduce the production cost
.
"Ethane is a high-quality raw material for ethylene cracking.
The cracking furnace must use sufficient ethane to ensure high ethylene output and high ethylene yield
.
As the temperature drops, it brings difficulties to the ethane unloading of the plant
.
They are actively looking for measures to reduce the loss of ethane unloading in winter, and standardize the operation of ethane entering the plant.
When each vehicle of ethane is near the end of unloading, the exhaust gas has a certain pressure.
In order to recover this part of ethane, employees strictly operate It is recycled into the ethane recovery tank to avoid the loss caused by emptying, which not only reduces the loss, but also realizes the environmental protection of unloading
.
At the same time, they actively connected with the material loading center to ensure that the light hydrocarbon and ethane plans were completed, and the vehicles entered the plant in an orderly manner to meet the use of cracking furnaces
.
Deep cracking of subdivided raw materials
Deep cracking of subdivided raw materials"Subdivision of raw materials, different raw materials, suitable for different cracking furnaces can achieve the purpose of increasing ethylene production
.
The olefin plant continues to strengthen the monitoring of the operation of the cracking furnace, optimize the input of naphtha, tail oil and light hydrocarbons.
The gas furnace is given priority to use ethane cracking, and the hourly consumption is kept above 11 tons/hour, and the proportion of LNG ethane input is increased.
The proportion of LNG ethane input increased by 1.
81 percentage points from November 2019
.
For LNG ethane, self-produced ethane, and refinery light hydrocarbons that enter different cracking furnaces for cracking, they actively do a good job in the subdivision of raw materials.
Combined with the results of small-cycle SPYRO simulation calculations and the results of regular calibration of cracking furnaces, it is determined that each raw material is in different The most suitable cracking conditions of the cracking furnace realize dynamic adjustment
.
They made active preparations and contacted the research institute to simulate the operation.
Once the conditions were met, they would crack the light naphtha of the refinery and the first-line naphtha of Sanchang at any time to prepare for the direct supply and re-optimization of raw materials
.
Fine-tune optimization operations
Fine-tune optimization operationsAccording to the characteristics of the low-nitrogen burner of the cracking furnace, the olefin plant has repeatedly optimized and adjusted, and the low-nitrogen burner has become more and more stable.
Under the high-load production in winter, 5 gas furnaces are kept in operation as much as possible to ensure that the input ratio of gas raw materials is 23%.
, increasing the production of ethylene
.
"How to turn high-quality raw materials into real ethylene, strengthening the operation and management of cracking furnaces is the key
.
" Jiang Wenkang, deputy director of the plant's cracking workshop, said
.
Although ethane is a high-quality raw material for increasing the production of ethylene, due to the complex process of the cracking furnace, the amount of ethane is too much, and the temperature at the top of the demethanizer is high, resulting in ethylene loss, which must be finely adjusted to ensure the increase in ethylene production
.
While ensuring the optimal temperature at the top of the demethanizer, they searched for the optimal amount of ethane to effectively increase ethylene production, maximize ethane consumption, and increase ethylene production
.
In response to the low temperature of the naphtha cracking furnace affecting the ethylene production, they formulated a strict adjustment plan.
The technicians guided the operation on the spot, and the internal and external operations cooperated with each other to increase the temperature of the cracking furnace as much as possible and increase the production of ethylene
.
After a series of raw material optimization measures in the olefin plant, in December 2019, the yield of high by-products of the ethylene unit was 62.
78%, of which the yield of ethylene was 36.
25%, the highest monthly level in history
.
