Bluestar Machinery successfully developed the largest nitric acid absorption tower in China

The core equipment of the nitric acid plant, φ4600mm nitric acid absorption tower, has been successfully developed in Sichuan Lanxing Machinery Co., Ltd. and will be used in the largest domestic 150,000 tons/year domestic nitric acid plant. This indicates that China has the ability to independently design and manufacture such large-scale chemical equipment with world-class technology, which has filled the gap in the field for a long time in China. At present, the absorption tower has been shipped to the user company Sichuan Meishan Jinsheng Sai Rui Chemical Company.

The absorption tower is produced by 3-stage manufacturing and on-site assembly. It has a diameter of 4.6 meters, a total length of 63.1 meters, a weight of 246 tons, and a single output value of 12 million yuan. It has created the largest of the three projects in the past 40 years: Bluestone Machinery Co., Ltd. And the heaviest. In order to improve the energy-saving and environmental protection performance of the equipment, the absorption rate of nitric acid mist is over 99%, and the nitrogen oxides in the exhaust gas are ≤200ppm. It must be ensured that the straightness deviation of any 3m long cylinder section of the absorption tower body should not exceed 3mm, 37 The flatness deviation of the block tray should not exceed 3 mm. To this end, Bluestar Machinery's technicians use laser technology positioning and re-examination from the baseline marking point to ensure that each link is fine and precise.

In 2004, Sino-US joint venture Sichuan Jinsheng Sairui Chemical Co., Ltd. invested heavily in importing a set of 150,000 tons/year nitric acid plant from Ireland. The company then decided to add another 15 square ton/year plant to expand production scale. . However, due to the high capital pressure on imported equipment, the company has repeatedly weighed and decided to use the crab to realize the localization of the nitric acid absorption tower of the core equipment of the device, and finally handed over the task of localization to the Blue Star Machinery Company.

To this end, Bluestar Machinery Company set up a research and development team to designate this equipment as the company's 2006 technology development project. In the manufacturing process of the equipment, the company adopted the international advanced sieve tray structure, coil structure and strict processing technology. In view of the connection between the tube and the tube sheet of the cooler in the tower, the company independently developed the welding technology of single-sided welding and double-sided forming of the inner hole, which is the first in China.

The successful localization of the φ4600mm nitric acid absorption tower is of great significance to the construction of large-scale nitric acid plants in China, and it also marks a significant increase in the strength of Bluestar Machinery's manufacturing of various large-scale petrochemical key equipment. It is understood that the absorption tower is expected to be installed at the end of July.