Only one steam superheating furnace in the national ethylene plant – the steam superheating furnace of the ethylene plant in the old Yangzi Petrochemical Zone was officially suspended. According to calculations, the energy consumption level of the Yangzi Ethylene plant will drop by about 10 kg of standard oil per ton of ethylene after the steam superheating furnace is decommissioned.
In the process design of ethylene plants in the early 1970s, steam superheating furnaces were installed to concentrate superheated steam recovered from overheating cracking furnaces. Therefore, most of the ethylene facilities such as Daqing Petrochemical, Qilu Petrochemical, Jinshan Petrochemical, Yangzi Petrochemical and other ethylene plants built in the 1980s were equipped with steam superheating furnaces. However, in the actual production process, the steam superheating furnace not only has high energy consumption but also has poor safety. Once the steam superheating furnace fails, it can easily affect the normal production of the ethylene plant. As a result, the steam superheating furnace was eliminated in the new plant design since then, and the recovered ultra-high pressure steam was overheated in the convection section of the cracking furnace. As a result, not only the investment in the steam superheating furnace is reduced, but also the fuel consumption is reduced, and the waste heat of the flue gas is fully utilized, the thermal efficiency of the cracking furnace is significantly improved, and the energy consumption of the ethylene plant is greatly reduced.
In order to reduce the energy consumption of ethylene plants, as early as the end of the century, old ethylene production companies such as Qilu, Yanshan, and Daqing had implemented energy-saving reforms, adding a steam superheating system to the convection section of the cracking furnace and deactivating the steam superheating furnace. Since the overhaul of the ethylene plant in August last year, Yangzi Petrochemical has invested 460 million yuan in the energy-saving transformation of ethylene plants, including the implementation of energy-saving transformation of five SRT cracking furnaces in the old district. The company adopted a variable frequency fan technology, furnace tube heat transfer enhancement technology, rare earth furnace tube technology, air preheating technology and APC advanced control technology and many other energy-saving technologies to carry out energy-saving transformation of 5 cracking furnaces, and increase the ultra-high pressure steam superheating system. To cancel the steam superheater. After the complete cracking of five cracking furnaces, the production capacity of a single cracking furnace was increased by 15,000 tons of ethylene per year, the ethylene yield increased by approximately 0.3 percentage points, the thermal efficiency increased by 2 percentage points, and the ethylene energy consumption decreased by 5.5%.
On October 9, Yangzi Petrochemical's last cracking furnace, the old No. 2 cracking furnace, was rebuilt and successfully put into operation. After the normal operation of No. 2 furnace, Yangzi Petrochemical immediately suspended the steam superheating furnace. After the steam superheater was deactivated, about 1500 kg of fuel gas could be saved per hour.
In the process design of ethylene plants in the early 1970s, steam superheating furnaces were installed to concentrate superheated steam recovered from overheating cracking furnaces. Therefore, most of the ethylene facilities such as Daqing Petrochemical, Qilu Petrochemical, Jinshan Petrochemical, Yangzi Petrochemical and other ethylene plants built in the 1980s were equipped with steam superheating furnaces. However, in the actual production process, the steam superheating furnace not only has high energy consumption but also has poor safety. Once the steam superheating furnace fails, it can easily affect the normal production of the ethylene plant. As a result, the steam superheating furnace was eliminated in the new plant design since then, and the recovered ultra-high pressure steam was overheated in the convection section of the cracking furnace. As a result, not only the investment in the steam superheating furnace is reduced, but also the fuel consumption is reduced, and the waste heat of the flue gas is fully utilized, the thermal efficiency of the cracking furnace is significantly improved, and the energy consumption of the ethylene plant is greatly reduced.
In order to reduce the energy consumption of ethylene plants, as early as the end of the century, old ethylene production companies such as Qilu, Yanshan, and Daqing had implemented energy-saving reforms, adding a steam superheating system to the convection section of the cracking furnace and deactivating the steam superheating furnace. Since the overhaul of the ethylene plant in August last year, Yangzi Petrochemical has invested 460 million yuan in the energy-saving transformation of ethylene plants, including the implementation of energy-saving transformation of five SRT cracking furnaces in the old district. The company adopted a variable frequency fan technology, furnace tube heat transfer enhancement technology, rare earth furnace tube technology, air preheating technology and APC advanced control technology and many other energy-saving technologies to carry out energy-saving transformation of 5 cracking furnaces, and increase the ultra-high pressure steam superheating system. To cancel the steam superheater. After the complete cracking of five cracking furnaces, the production capacity of a single cracking furnace was increased by 15,000 tons of ethylene per year, the ethylene yield increased by approximately 0.3 percentage points, the thermal efficiency increased by 2 percentage points, and the ethylene energy consumption decreased by 5.5%.
On October 9, Yangzi Petrochemical's last cracking furnace, the old No. 2 cracking furnace, was rebuilt and successfully put into operation. After the normal operation of No. 2 furnace, Yangzi Petrochemical immediately suspended the steam superheating furnace. After the steam superheater was deactivated, about 1500 kg of fuel gas could be saved per hour.
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