On September 10, China's largest DN3300 reforming mixed feed heat exchanger (also known as coil wound heat exchanger) developed and manufactured independently by Bluestar Machinery has been assembled successfully with only one attempt. It will be used in a 900,000 tons/year diesel hydrogenation and modification plant in Shandong. The innovative horizontal hoisting assembly saved a large amount of time and cost.
It is over 20 meters long, 3.3 meters in diameter, and over 170 tons in weight. Its internal parts combined weigh over 110 tons. Its material (hydrogen resistant steel) is special; it has over 6,800 thin tubes (∅16X1mm); and the shell and internal parts are all high-temperature parts (550℃). Therefore, it is harder to be made than that of a gasifier for the coal chemical industry, with higher manufacturing precision requirements and a more sophisticated process. According to the project chief at Bluestar Machinery, the heat exchanger is highly heat conductive, resistant to high temperature, high pressure and operational fluctuations; it is a highly reliable device for continuous reforming, with a bright market prospect.
As the largest chemical equipment manufacturing enterprise in western China, Bluestar Machinery successfully developed integrated and innovative high-efficiency coil wound heat exchanger following the successful R&D of WHG gasifier in 2014, accumulating rich experience in the R&D and manufacturing of the product.
In the assembly of the giant heat exchanger, the members of the project faced tough challenges. Although the heat exchanger belongs tohuge equipment, the gap between the shell and internal parts is nothing but 6mm. The assembly requires that internal parts be kept concentric and docking wrong side volume and straightness be less than 2mm. To solve the problem, engineers came up with the innovative horizontal hoisting assembly after comparing with the conventional vertical hoisting assembly, flat car hoisting assembly and pad hoisting assembly through fine measurement and data analysis. The innovative method reduced the assembly time by more than 10 days and fabrication cost by RMB 150,000.
