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Case Introduction

As one of the first domestically built single-train ethylene plants with a capacity of 2 × 1.5 million tonnes per year, this project is currently among the largest and most technologically sophisticated ethylene facilities in China. It also serves as a landmark initiative for Shandong Province’s transformation from old to new growth drivers and as a key project in Sinopec’s drive to localize its equipment manufacturing.

In this large-scale, high-priority project, Changsha Boneng has achieved full domestic self-reliance in the supply of tower internals. The company’s independently developed core technologies—including the six-overflow BV-V fixed-valve tray, Lupac anti-clogging grid packing, and the BV-T series of high-efficiency guided floating valves—have successfully established a comprehensive tower internals solution, markedly reversing the long-standing situation in which high-end tower internals were predominantly imported.

In September 2024, the project achieved successful single-run commissioning. This milestone underscores significant progress made by China’s petrochemical industry in its pursuit of large-scale, intelligent, and green development, particularly in the area of domesticating core equipment. It has enhanced the industry’s competitiveness in critical separation technologies and demonstrated Changsha Boneng’s robust technical capabilities in the high-end petrochemical equipment sector.

Six-overflow tray technology

1. Compatible with float valve, sieve tray, and bubble-cap tray bubbling elements;

2. Adopt a liquid distribution scheme with equal flow rates or equal bubble-contact areas;

3. Employ ANSYS finite element simulation for precise strength analysis;

4. Utilize 3D modeling technology to automate drawing generation;

5. The tray features a self-locking structure to minimize overlap blind spots;

6. Precise liquid-phase distribution is achieved by integrating technologies such as the downcomer bottom-clearance spacing plate, weir height, and swept weir.

7. A connecting-pipe structure is employed for precise distribution of the gas phase.

8. The liquid-phase handling capacity is 40% higher than that of conventional tray towers, and the gas-phase throughput is increased by 15%.

Performance Indicators for Each Tower Startup

Serial Number	Device Name	Equipment Tag	Tower diameter mm	Scope of Supply	Performance Parameters	Technical Requirements
1	1# Propylene Tower	1201/1251-C-4101	Φ9200	163-Stage Six-Overflow BV-Y Solid Valve Tray	Propylene content ≥ 99.84 mol%	Side-stream product quality: Propylene content ≥ 99.6 mol%
2	2# Propylene Tower	1201/1251-C-4102	Φ7600	85-Stage Six-Overflow BV-Y Solid Valve Tray	Propylene loss ≤ 0.16 mol%	Product quality of the tower bottom: propylene content ≤ 2.5 mol%
3	Quench Oil Tower	1201/1251-C-1501	Φ12600	12-tray double overflow solid valve + two-stage Lupac grid packing
4	Ethylene Tower	1201/1251-C-4002	Φ7300	149-Stage Four-Overflow Corrugated Guided Floating Valve Tray	Ethylene purity at the top of the column ≥99.97%; ethylene loss at the bottom of the column <0.5%.	Top-of-column product quality: ethylene ≥ 99.95 mol%; Bottom-of-column product quality: ethylene ≤ 0.5 mol%.
5	Alkali Wash Tower	1201/1251-C-2101	Φ6900	3-layer U-shaped bubble cap + 15-layer double overflow floating valve trays + random packing		Top-of-tower product quality: CO2 ≤ 1 ppm
			Organize	Lu Kuanhua	Data Time	July 12, 2025

Drawn-liquid tower for the 2 million t/a PX unit at Zhejiang Petrochemical

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