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火电厂锅炉受热面爆漏原因分析及防措 总被引:1,自引:0,他引:1
锅炉受热面爆漏的发生,一直影响着火力发电厂的正常运行,造成巨大的经济损失,分析了水冷壁、过热器、再热器和省煤器爆漏原因,并对常见的爆管问题提出了相应的防范措施. 相似文献
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针对水冷壁爆漏,冷灰斗四角开裂导致漏热等问题,从刚性梁系统安装,运行方面加以分析探讨,制定制性梁系统的改造措施,以减少和防止水冷壁管爆漏、提高电厂运行安全等。 相似文献
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为解决锅炉滑压运行及低负荷调峰能力,需对锅炉水冷壁进行改造,本文以某电厂530 MW超临界参数直流锅炉为研究对象,提出改造方案为:定压改滑压,采用哈锅典型螺旋管圈水冷壁结构,即螺旋管圈+垂直管圈布置结构,分离器布置于水冷壁出口,增加贮水箱,尾部包墙和顶棚管属于过热器系统。通过水冷壁安全性校核计算,分析裕量和锅炉运行的安全性。 相似文献
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近几年通过加深对UP型直流锅炉的认识,加强运行、检修管理和设备技术改进,望亭、谏壁及黄埔等电厂在防止国产UP型直流锅炉四管爆漏、提高机组可靠性方面取得了突破性的成果。 相似文献
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国内超临界W火焰直流锅炉水冷壁采用低质量流速垂直管设计,机组在高、低负荷工况运行时,水冷壁垂直管上部温差过大,影响了锅炉的安全运行。针对目前超临界W火焰直流锅炉水冷壁运行时出现的壁温差过大的问题进行分析,并提出运行及设计的改进措施。 相似文献
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240 t/h锅炉运行期间由于锅炉刚性梁的频繁晃动、刚性梁锁扣松动,导致锅炉水冷壁管被撕裂、水冷壁管发生泄漏事故,通过对锅炉刚性梁锁扣的改造,有效地避免了锅炉刚性梁的晃动,确保了锅炉的稳定运行. 相似文献
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国产化600MW超临界直流锅炉采用带有循环泵的启动系统,其主要特点是采用给水泵与循环泵并联运行的方式,提高了水冷壁在低负荷下运行的可靠性和经济性以及机组对负荷变化的跟踪性能.采用新一代启动系统可以对超临界直流锅炉启动过程中的循环流量调节、给水泵流量调节、储水箱水位调节、水冷壁由控制循环转为直流运行工况等复杂过程灵活控制.对启动系统的运行特点和本生点的技术选择问题进行了比较详细的分析. 相似文献
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A pressure wave is generated ahead of a high-speed train, while entering a tunnel. This pressure wave propagates to the tunnel exit and spouts as a micro-pressure wave, which causes an exploding sound. From the fact that the ballast track tunnel has smaller noise than the slab track tunnel, we have suggested a new inner tunnel model to decrease the noise of the micro-pressure wave, using the ballast effect. Experimental and numerical investigations are carded out to clarify the attenuation and distortion of propagating compression wave over porous plate wall in a model tunnel. Data shows that the strength of the compression wave and a maximum pressure gradient of the compression wave was weakened. These data shows the possibility of the present alleviative method using the porous plate wall in a tunnel. 相似文献
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实际工程表明,采用飞灰复燃技术对锅炉进行改造,可以减少飞灰所带走的燃料损失,提高锅炉效率,但飞灰回收复燃给壁面颗粒沉积状况也带来了影响.采用FLUENT模拟了SZL15-1.25-AⅡ型双筒链条蒸汽锅炉炉内燃烧,对比分析了采用飞灰复燃技术前后炉内壁面颗粒沉积状况.模拟结果表明,飞灰复燃对锅炉顶墙、前墙及后墙的颗粒沉积速率影响较大,其中飞灰复燃提高了顶墙和前墙的颗粒沉积速率,降低了后墙颗粒沉积速率,而对锅炉前后拱的影响很小可以忽略.减小飞灰入射质量流量或调整飞灰入射角度为水平偏下,均可以降低颗粒在水冷壁的沉积速率,有利于炉膛与水冷壁间的传热. 相似文献
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炉膛中间截面边界条件对双切圆锅炉空气动力场计算的影响 总被引:1,自引:1,他引:0
大容量超超临界锅炉广泛采用单炉膛双切圆的空气动力组织方式,在计算流体力学软件FLUENT平台上,针对1GW超超临界单炉膛双切圆锅炉,计算了全炉膛和炉膛中间截面边界条件设为对称面和边壁条件的炉内空气动力场。计算表明,与标准κ-ε双方程模型相比雷诺应力模型(RSM)具有更高的计算精度;中间截面采用对称边界条件时,其流场分布规律与全炉膛模拟结果相似;中间截面为边壁条件时炉膛中间截面附近流速降低,但对整个炉膛流场影响较小;中间截面采用这两种边界条件均会导致1#、6#角射流衰减缓慢而冲刷炉膛前墙中间水冷壁。 相似文献
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降低电站锅炉排烟温度新技术研究 总被引:3,自引:0,他引:3
研究探索了提高电站锅炉热效率的新方法,将远红外材料涂敷于电站锅炉水冷壁辐射受热面上,提高了水冷壁管内介质加热效率,在负荷增加的情况下排烟温度下降了31℃,锅炉热效率提高了2.42%,年节约标煤10070t。项目的研究极大地推进了电站锅炉的节能工作,为我国电站锅炉的节能降耗提供一条新途径。 相似文献
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Vacuum cooling technology is a proven technology widely applied on post-processing of harvested agricultural products. However, there are few researches on its application on root/stem vegetables. Bamboo shoot is a type of root/stem vegetables with high economic value in Taiwan. It is also enjoyed by Taiwanese and Asian people. This study experimented with vacuum cooling in combination with hydrocooling and vacuum drying on harvested bamboo shoots. It intended to discuss the relationships among the temperature of cooling water, the pressure of vacuum chamber, and the temperature of bamboo shoots during these processes. The experimental results showed that multi-stage vacuum pressure reserving technique combined with hydrocooling could reduce the temperature of bamboo shoots efficiently. It has the advantage of minimizing the energy consumed by the vacuum system. In this study, bamboo shoots were treated with vacuum cooling and hydrocooling process, and then vacuum dried to reduce the water content of the surface and bamboo crust. It was proven to prolong the storage time and improve the freshness preserving quality efficiently. The finding provides a possibility of shipping bamboo shoots to nearby countries via sea transportation. As a result, the competitiveness of Taiwan-produced bamboo shoots could be enhanced to an international scale. 相似文献