The quench ring, which had been in use for eight years, has finally been taken out of service!

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http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/bc5e6c2bdfe629e7347949e7fcb7e0a8.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/d3c45af14b7e8271c695371f9c0fc617.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/db3f47fb50a31976dfafe20d8c96bcb4.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/00502ac83c89e2ff372fe73697264d37.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/979c2f564f02e29c00f05b57ab9c055b.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/dfb92df810ec97a75268402fa71600a7.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/0982ecf5753907b1a672955f7f27a037.jpg In the technology of multi-nozzle opposed water-coal slurry pressurized gasification furnaces, the quenching ring is a key component; its operational condition directly affects the stable operation of the gasification furnace. Over the eight years since the launch of Luhua’s multi-nozzle gasification furnace in 2008, in an effort to extend its operational cycle, we have, based on actual operation conditions and the problems that arose, utilized various big data metrics related to gasification to gradually develop some practical experience guidelines for maintaining the furnace’s proper operation, thus laying a solid foundation for its stable performance. The process gas exiting the combustion chamber carries the ash resulting from combustion; it passes through the quenching ring and downcomer, where it is cooled by quenching water to remove the ash. Then, via the water seal, it passes from the bubble-breaking strip to the brick-supporting cone before exiting the gasification furnace. Flow characteristics of process fluids: a simultaneous transfer of heat and mass, with the two influencing and restricting each other. It carries out the processes of washing (dust removal), cooling (heat recovery), and humidification of crude syngas. On the one hand, the high-temperature syngas transfers heat to the cooling water film on the inner wall of the downcomer through radiation and convection, causing part of the water in this film to vaporize and enter the main stream of the syngas, thereby sharply reducing the temperature of the syngas and increasing its humidity ； The water vapor in the exhaust gas reaches phase equilibrium with the quenched water. On the other hand, the quenching water must have an adequate volume of water; as a result, even though water continuously evaporates within the water film, the film remains intact and is evenly distributed across the inner wall of the downcomer. Thus, the temperature of the water film stays constant, which helps to protect the downcomer from damage caused by high-temperature thermal stress. The role of quenching water in this process is twofold; one of them is to wash the cooling medium ； The second purpose is to protect the quench ring and downcomer from damage caused by high temperatures. To prevent damage to the cooling ring caused by insufficient cooling water volume or short-term or long-term water interruptions, detailed plans and data analysis were developed in advance, ensuring safe operation in the future. Over the past eight years, this cooling ring has experienced 3 short-term water interruptions (within 10 seconds) and 1 long-term water interruption (for 1 hour) during operation, yet damage to the cooling ring was successfully avoided in all cases. To date, the cooling ring is still in optimal condition (the reason for replacement: the cooling ring was replaced along with the slag outlet bricks due to the long operating cycle); it is kept as a spare part. The image below shows the new cooling ring that is about to be replaced: http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/b02de9aa0b370ad5d0406d500da0461c.jpg http://www.smjqh.com/d/file/qihuaguanli/ktzs/2016-09-03/638879a8d34b79145bde7154a95035f2.jpg