Thread Content
Another breakthrough in the technical upgrade of the gasifier at Xintian Coal Chemical Industry Co., Ltd. Author/Source: Zhejiang Energy Xintian Coal Chemical Industry Co., Ltd. Date: April 21, 2021. Clicks: 7. Recently, after half a month of intensive work, the second Bosman sleeve technical upgrade was completed for Gasifier No. 1 in Framework C of Xintian Coal Chemical Industry’s pressurized gasification unit. After the modification, the frequency of coking in the gap between the Porsmann sleeve and the jacket will be significantly reduced, thereby extending the operating cycle of the gasifier. Since its commissioning, Xintian Coal Chemical Industry has seen record-high production levels of raw gas from its pressure gasification unit. However, this has also revealed the problem of \"coking in the washing coolers, which leads to distortions in the temperature of the raw gas at the outlet of the gasifier.\" This issue will directly affect the ability of the pressure gasification unit to operate at full capacity for extended periods of time. To address this challenge, the company established a technical task force in early 2019 comprising multiple departments. By analyzing various factors such as previous operation data, equipment structure, and process parameters, they ultimately came up with a modification plan to increase the distance between the Borsig sleeve of the gasifier and the inner wall of the gasifier from 186 millimeters to 386 millimeters. Following a technical upgrade that lasted nearly 90 days, all 22 gasifiers at Xintian Coal Chemical have completed their first round of such upgrades. After the modification, operational tests of the gasifier showed a significant improvement in its performance; the amount of material carried out at the gasifier outlet decreased, and coking at the outlets of the Porsmann sleeves and the washing coolers was greatly reduced, resulting in a lower frequency of coking removal. Over the past two years, the company has taken into account the actual operating conditions of the gasifier as well as changes in operational data, with the goal of achieving efficient, high-quality, and long-term operation of the gasifier. Therefore, after achieving the innovative results of the first phase, the company proceeded with the second phase of technical upgrades involving the Porsmann sleeve of the gasifier. In light of the actual production conditions, the working group held several on-site coordination meetings to carefully plan the technical upgrades, and once again arrived at a modification plan that involved adjusting the distance between the Borsman sleeve of the gasifier and the inner wall of the gasifier to 400 millimeters, as well as extending the Borsman sleeve downward by 200 millimeters. The objective is to increase the temperature at the outlet of the gasifier, reduce coking at the outlets of the Porsmann sleeve and the washing cooler, produce higher-quality and more efficient raw gas, and ensure the stable and safe operation of subsequent processes. In this technical renovation project for the Bosman sleeves, the renovation team analyzed the specific conditions of the gasification furnace based on design parameters and production data, including previous coking removal operations from the Bosman sleeves and readjustments to the spacing between these sleeves, and after further analysis and evaluation, formulated the technical renovation plan for the second phase. This technical upgrade project for the Porsmann sleeve in the gasification furnace represents a new level of advancement in the coal-to-gas industry; it is another optimization and improvement of the Lurgi furnace system, based on experience gained from actual production. Currently, three gasifiers in the company’s pressurized gasification unit have completed the second phase of technical upgrades, namely Gasifiers No. 2 and No. 4 in Frame B, and Gasifier No. 1 in Frame C. The upgraded gasifier has now been put into formal operation, with evident results, good operating conditions, and accurate and reliable process parameters. Next, the remaining technical upgrades for the gasification furnaces will be carried out steadily in line with actual production conditions.