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On January 8, there was good news from Qilu Petrochemical Olefin Plant.
Last year, the Olefin Plant overcame the influence of GB501 shaft displacement and vibration and 6 heavy pollution weathers, continued to optimize the structure of raw materials, increased the input of high-quality raw materials, and the ethylene plant reached a high level throughout the year.
The yield of attached products was 61.
61% and the yield of ethylene was 35.
02%, both hitting the highest level in the history of the year
.
In 2019, the olefin plant focused on the old plant with an annual output of only 800,000 tons of ethylene.
All employees have brainstormed and used hard tricks to control the quality of raw materials through the source, and there are clever tricks to stabilize the operation of ethylene core equipment and improve fine operation.
There are practical measures for the indicators.
The annual production of ethylene is 856,500 tons, and the yield of high-added products and ethylene yields of the ethylene plant have reached the highest level in the history of the year
.
Use hard tricks to control the quality of raw materials at the source
Use hard tricks to control the quality of raw materials at the sourceThe naphtha used for cracking in the olefin plant comes from the refinery.
The content of the alkane components in the raw material directly affects the ethylene yield.
The quality of the naphtha must be controlled at the source, and the improvement of the index can become a reality
.
In January last year, due to various reasons, the quality of naphtha declined, which not only affected the ethylene index, but also ethylene production declined.
After a month, the situation was extremely severe
.
"Increasing the alkane content of naphtha by 1 percentage point, according to SPYRO's calculation, can increase the high attached yield by 0.
35 percentage points
.
After the multi-party coordination of the company, the refinery has continuously optimized the production, and the quality of the self-produced raw materials has been improved month by month.
In April, the alkane content of naphtha reached 70.
70%
.
The olefin plant seized this favorable opportunity and achieved an average hourly output of over 100 tons of ethylene from March to June through scientific optimization of the raw material structure
.
While strictly controlling the quality of naphtha, they actively connected with the material and packaging center to ensure that the light hydrocarbon and ethane entry plan was completed, and the vehicles entered the plant in an orderly manner, so that the cracking furnace could eat high-quality raw materials
.
There are clever tricks to stabilize the operation of ethylene core equipment
There are clever tricks to stabilize the operation of ethylene core equipmentLong-term stable operation of cracking furnaces in olefin plants is the key to improving high by-product yields
.
Last year, the shaft displacement of the compressor was too large, which brought challenges to the long-cycle operation of the cracking furnace
.
They actively responded to the actual problems, invited Japanese manufacturers and domestic industry experts for consultation, and at the same time played the role of the cracking furnace tackling team, further optimized the entire system, and formulated detailed "operation precautions" according to the requirements of experts
.
In response to the problem of the large shaft displacement of the propylene refrigeration compressor, the cracking furnace research team further optimized the original operation based on the original operation, formulated more detailed operation precautions, and sent it to the team for training
.
Employees pay close attention to the change trend of shaft displacement, record and report regularly, and immediately send the situation to the "displacement special WeChat group" when they find obvious changes
.
Through a series of optimization measures, the axial displacement of propylene refrigeration compressor GB501 has been effectively controlled, but there is still a large safety risk in high-load production
.
In order to ensure the smooth operation of the ethylene plant of the olefin plant, realize the long-term stable operation of the compressor, and prevent the plant from being shut down due to the failure of the compressor system, they brainstormed and looked for tips to solve the problem
.
On October 16, after the transformation, the olefin plant realized the direct supply of gas-phase ethylene to the plastic plant, which relieved the production load of the propylene refrigeration compressor GB501 and provided support for high-load production
.
"Through the transformation, gas-phase ethylene can be directly supplied to the plastics plant by 3 tons per hour, reducing the production load pressure of GB501 and effectively ensuring the stable operation of the propylene refrigeration compressor
.
" said Zhao Lihang, deputy director of the cracking workshop of the olefin plant
.
The putting into use of the gas-phase ethylene direct supply transformation project makes it possible for the long-term operation of the ethylene plant to improve the index
.
Practical tricks to improve indicators by fine operation
Practical tricks to improve indicators by fine operationThe olefin plant has different raw materials for each of the 15 cracking furnaces, and the operation must be fine and fine, without any errors, in order to improve the index
.
After the raw material is cracked in the cracking furnace, it goes through a series of reactions and finally reaches the separation zone
.
The separation post is responsible for the output and quality of ethylene products.
All products need to be separated for hydrogen distribution.
Controlling the hydrogen to not exceed the standard can reduce product losses and improve yield
.
By adjusting the pressure and flow of the tower, the amount of methane and ethane in the product is controlled to achieve a qualified product and maximize the ethylene yield
.
The cracking workshop carried out a small-index labor competition, from engineering and technical personnel to operators, all went to the front line to optimize the operation of the device and control the device in an optimal operating state.
Stable and stable
.
"In order to improve the ethylene yield, the outlet temperature of the cracking furnace should be controlled according to different raw materials, and the outlet temperature of the cracking furnace for light hydrocarbon raw materials needs to be controlled at 850 degrees to achieve the best cracking effect
.
" Changshi Wenge, on duty in the cracking workshop of the olefin plant say
.
Through the labor competition of small indicators, the enthusiasm of the employees has been improved, the operation of the employees is more refined, and each parameter must be adjusted to the best value
.
They also intensified the assessment of process indicators, and strictly assessed indicators such as the outlet temperature of the cracking furnace, dilution ratio, adsorption pressure, and top temperature of the demethanizer, which affected the ethylene yield, and the indicators were greatly improved
.
In the last month of last year, the olefin plant overcame the impact of two heavy pollution weather, continued to optimize the raw material structure, and increased the ethane processing capacity.
The yield of high-attached products of the ethylene unit was 62.
78%, of which the yield of ethylene was 36.
25%, the highest monthly level in history.
, refreshed the high attached yield of 61.
49% and the ethylene yield of 35.
9% in March 2017, helping the two indicators of the year hit new highs
.
