共查询到20条相似文献,搜索用时 78 毫秒
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分析了尿素装置增设惰气精洗器的必要性和可行性,简述了其工作原理、工艺流程、技术特点和应用实效。结果表明,增设惰气精洗器可将惰洗器尾气中的氨含量由10%降至0.3%,吨尿素回收氨6~10 kg;30万t/a尿素装置可节省生产成本360万元/a,增设惰气精洗器的投资回收期为2个月。 相似文献
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我公司铜洗工段现有的2套铜洗装置,各有1台西φ1 000 mm和1台φ1 200 mm铜洗塔,2套铜洗系统自用氨量较大,每班6~8 m<'3>(3.75~5 t).由于合成弛放气中氨含量较高(测定25%左右,理论30%~40%),需去等压吸氨净氨后再提氢.等压吸氨每班产氨水折氨约3 t,去尿素或深度水解回收入系统,班耗蒸汽4~5 t,且气温上涨后,导致尿素吸收系统负荷增加,系统不稳,尾吸放空气氨含量上升,氨耗上涨. 相似文献
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合成放空气中含氨约8—9%左右,而弛放气中氨的百分含量更大。合成放空气的气量约为合成补充新鲜气量的8%左右,如遇气体成份不好,放空气的气量还要大。因此,回收合成放空气和弛放气是增产节约的一项重要措施。根据合成放空气和弛放气中的氨极易溶于水而氢和甲烷等可燃气体不易溶于水的性 相似文献
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一、概述每生产一吨合成氨,放空气量一般是150~250标米~3/吨氨(对于采用劣质煤为原料时,可能达到200~300标米~3/吨氨)。放空气中含有8~12%(体积,以下同)的氨,则每生产一吨合成氨,随着放空气排出的氨量是15~20公斤,占合成氨产量的1.5~2.0%,有的甚至达3%。以往,许多合成氮厂回收放空气中的氨,一般是将高压的放空气减压至几公斤的低压或常压后,用软水吸收其中的氨,制得稀氨水回收利用。但这种方法氨的回收效率都比较低,一般为30~50%,加上有些单位选用的设备结构 相似文献
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0 前言。山东肥城化肥厂宁安分厂合成放空气、氨贮槽弛放气和铜洗再生气中的氨经氨回收系统回收后送碳化工段生产碳铵,存在母液排放量大、氨回收利用率低、环境污染严重等问题,加上碳铵销售价格低,效益不理想。针对此情况,对氨回收系统进行了改造,即采用逐级提浓回收氨,氨水送尿素低压系统吸收解吸气和二段分解气中的氨、二氧化碳后用于生产尿素,取得了较好的经济效益和环保效益。 相似文献
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介绍了利用合成氨生产中的弛放气和放空气经压缩、洗氨、脱水、液化等生产过程获得液化天然气产品的回收工艺。通过实例验证,该工艺不仅可提高资源的利用效率,而且投资小、收益高、投资回报期短,也符合国家节能减排的政策方向。 相似文献
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介绍了太原钢铁(集团)有限公司炼铁厂烧结机烟气活性炭干法脱硫富集SO_2烟气的组分和工况。该富集SO_2烟气流量小、温度高、高含硫、高含尘并含有氨、氟、氯、汞等有害杂质,设计采用喷淋塔一一级泡沫柱洗涤器—气体冷却塔—二级泡沫柱洗涤器—两级电除雾器稀酸洗工艺加以处理,并对净化设备进行了设计选型。炼铁厂450m~烧结机烟气脱硫制酸装置已稳定运行1年多时间,净化工序各项指标均达到或超过设计值,较好地解决了恶劣工况烧结烟气净化除杂问题,净化收率达到99.01%,净化工序出口烟气尘(ρ)1.4mg/m~3,硫酸雾、HF、HCl、NH_3等微量。 相似文献
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介绍一种新的磷肥厂除氟除氨洗涤器-卧式错流填料层洗涤器。该洗涤器气液呈错流接触。传质效果好,压力降低,采用卧式结构和可卸式聚丙烯丝填料,便于安装,清洗和维护。 相似文献
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Flue gases from a hazardous waste incinerator have been sampled in three campaigns, before and after, an oxidative acid wet scrubber working with the MercOx‐process. A continuous emission monitor for mercury speciation was used before the scrubber in the first campaign. In all campaigns, impingers with KCl and KMnO4 were used. A solid adsorption method was used in the last campaign. The mercury leaving the scrubber is oxidized at > 90 % efficiency (independent of the inlet speciation). A substantial decrease in the redox potential of the scrubber liquid caused an increased fraction of elemental gaseous mercury to be present in the clean gas. The measurements also show that the scrubber has the ability to readily absorb mercury peaks. During one extreme peak of 3,600 μg/m3 (dry gas) in the raw gas, the removal efficiency was above 99.9 %. 相似文献
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对CO2汽提法尿素装置高压洗涤器防爆筒爆裂事故进行探讨,提出提高尿素装置高压洗涤器本质安全管理理念。采用CO2原料气脱氢技术后,扩大了尿素装置主要参数的调节范围,彻底消除了安全隐患,而且吨尿素一般可降低氨耗2kg左右。 相似文献
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During the calcination of magnesium ammonium phosphate hexahydrate (struvite) in the process of recycling to obtain phosphoric acid, ammonia is released in addition to water and carbon dioxide. With a gas scrubber, e.g., in the form of a bubble column reactor, ammonia can be recovered as a usable valuable material. With water as an inexpensive and effective absorbent, almost complete absorption (92 %) of the ammonia from the exhaust air can be achieved. 相似文献
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介绍了泡沫柱洗涤技术在净化改造中的应用,泡沫柱洗涤装置的设计、施工、调试几运行。运行情况表明,泡沫柱洗涤装置降温除尘效果明显优于冲击洗涤器,且具有适应烟气波动能力强的优点。 相似文献
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Impact of calcium chloride addition on mercury transformations and control in coal flue gas 总被引:2,自引:0,他引:2
Pilot-scale experiments were conducted to investigate mercury transformations in coal flue gas when firing subbituminous coal with a CaCl2 additive. Cofiring the CaCl2 additive with the subbituminous coal resulted in approximately 50% oxidized mercury, as a result of reactive chlorine species formed in coal flue gas, compared to the dominance of elemental mercury in the baseline flue gas. The mercury data indicate that mercury-flue gas chemistry reactions may occur at fairly high temperatures (>400 °C) in chlorine-enriched flue gas. Field tests were conducted to further demonstrate the impact of cofiring CaCl2 on the eventual fate of mercury. These tests were completed on a 650-MW subbituminous coal-fired power plant equipped with selective catalytic reduction (SCR), a fabric filter (FF), and a wet scrubber. Overall mercury removals across the SCR-FF-wet scrubber system ranged from 75% to 96% with 200-800 ppm (coal basis) chlorine addition compared to 18-32% during baseline operations. Field data indicate that the SCR enhanced mercury oxidation, possibly as a result of the supplemental formation of reactive chlorine species and the aid of the SCR catalyst. As a result, most of the mercury in the flue gas was in an oxidized state and was removed in the downstream wet scrubber, indicating that cofiring CaCl2 is an effective mercury control approach for a subbituminous coal-fired plant equipped with an SCR and wet scrubber. 相似文献