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首页> 外文会议>International chemical recovery conference >A Comparison of Superheat and Reheat Steam Cycles with Black Liquor Gasification for Pulp Mill Power Generation
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A Comparison of Superheat and Reheat Steam Cycles with Black Liquor Gasification for Pulp Mill Power Generation

机译：制浆厂发电用黑液气化的过热和再热蒸汽循环的比较

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Pulp mills have used recovery boilers to burn the waste products of the pulping process (black liquor), and reconstitute the chemicals used in the pulping process since the 1930s. Black liquor is a biomass-derived fuel produced from the lignin that is in the feedstock to the pulping process. The steam generated from the boiler is primarily used to supply the pulping process and also to generate electricity. Rising energy costs and incentives for energy generated from renewable sources have motivated pulp mills to improve the electrical power generating potential from the black liquor.The traditional Tomlinson recovery boiler efficiency has been improved by increasing the liquor's percent firing solids, and the generating efficiency has been improved by increasing superheater steam pressures and temperatures.Black liquor gasification is a process that replaces the Tomlinson recovery boiler by gasifying the liquor and delivering the gas to a boiler, combustion turbine, or some other process. Some studies have shown that burning the gases in a gas turbine that exhausts into a heat recovery steam generator (HRSG) would generate more power and would be financially more attractive than traditional mill steam cycles. This process is known as black liquor gasification combined cycle (BLGCC). BLGCC has yet to be successfully implemented. Gasification projects have been abandoned for varying reasons, and no project has been able to burn the product gas in a gas turbine.In 2009, Babcock & Wilcox (B&W) introduced the dual pressure reheat recovery boiler (DPRRB). The dual pressure furnace is a patented concept that allows the lower part of the furnace, which is exposed to the oxygen-starved environment, to operate at a low pressure to prevent high corrosion rates. The upper furnace can then operate at high enough pressure to facilitate a reheat steam cycle. The reheat cycle has the potential to improve the power generating potential of a pulp mill steam plant. The power generated from a pulp mill reheat steam cycle approaches the theoretical generation potential of a BLGCC process.
机译：制浆厂使用回收锅炉燃烧制浆过程中的废品（黑液），并重新配制自1930年代以来制浆过程中使用的化学物质。黑液是木质素生产的生物质衍生燃料，木质素是制浆过程的原料。锅炉产生的蒸汽主要用于提供制浆过程以及发电。不断上涨的能源成本和对可再生能源产生动力的激励，促使纸浆厂提高了黑液的发电潜力。 传统的汤姆林森回收锅炉的效率通过提高白酒的燃烧固体百分比来提高，而发电效率则通过增加过热器的蒸汽压力和温度来提高。 黑液气化是一种通过汽化白液并将气体输送到锅炉，燃气轮机或其他方法来代替汤姆林森回收锅炉的方法。一些研究表明，在燃气轮机中燃烧废气后排入热回收蒸汽发生器（HRSG），将产生更多的电力，并且在财务上比传统的磨机蒸汽循环更具吸引力。此过程称为黑液气化联合循环（BLGCC）。 BLGCC尚未成功实施。气化项目由于各种原因而被放弃，没有项目能够在燃气轮机中燃烧产物气。 2009年，Babcock＆Wilcox（B＆W）推出了双压力再热回收锅炉（DPRRB）。双压力炉是获得专利的概念，它可使暴露于缺氧环境中的炉下部在低压下运行，以防止高腐蚀速率。然后，上部炉可以在足够高的压力下操作以促进再热蒸汽循环。再热循环具有改善制浆厂蒸汽设备的发电潜力的潜力。制浆厂再热蒸汽循环产生的功率接近BLGCC工艺的理论发电潜力。

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