The object of the invention is to provide a method of \whitening\ wet flue gas after desulfurization and co-generation of waste heat, which is used to solve the problem of white smoke appearing in the subsequent exhaust of the wet desulfurization process, and to achieve the effect of generating electricity by utilizing low temperature waste heat. A desulfurized wet flue gas \whitening\ method for co-generation of waste heat includes: the flue gas enters the desulfurization tower after cooling by a flue gas cooler, and the desulfurized flue gas is condensed by a flue gas condenser, heated by a flue gas heater and discharged through a chimney; the heat carried by the heat exchanger working substance of a flue gas cooler is first generated by the generating working substance steam. The residual heat is absorbed by the carburetor and used to reheat the flue gas through the flue gas heater; the power generation working fluid after the carburetor vaporizes drives the turbine to rotate and then drives the generator to generate electricity; the power generation working fluid is liquefied through the power generation working fluid liquefier and then enters the power generation working fluid pump to continue circulating. The cold source provides cooling for flue gas condensers and power generation liquefying units. The invention has beneficial effects: the seamless combination of wet flue gas reducing \white smoke\ and low-temperature waste heat power generation realizes the cascade utilization of low-temperature waste heat, which has both social and economic benefits.
【技术实现步骤摘要】
一种脱硫后湿烟气“减白”协同余热发电的方法
本专利技术涉及烟气环保节能
,具体地说是一种脱硫后湿烟气“减白”协同余热发电的方法。
技术介绍
湿法脱硫是我国普遍采用的脱硫工艺,包括石灰石-石膏法、氨法及海水脱硫等工艺,利用石灰石浆液、氨水或海水等碱性吸收液在脱硫塔内喷淋洗涤燃煤烟气,烟气中的SO2被吸收液吸收,达到脱除SO2的目的。经过湿法脱硫后,大量水分蒸发,烟气形成饱和湿烟气经烟囱排放。由于环境温度较低,湿烟气中水蒸气冷凝形成雾状液滴,造成烟囱出口形成“白烟”现象,引起了社会的普遍关注。2017年以来,上海市、浙江省、天津、邯郸等地市陆续发布了政策要求,要求燃煤锅炉、钢厂烧结机、焦化等行业实施湿法脱硫后采取烟温控制及其他有效措施消除石膏雨、有色烟羽等现象。
技术实现思路
本专利技术的目的在于提供一种脱硫后湿烟气“减白”协同余热发电的方法,用于解决湿法脱硫工艺后续排烟中出现白色烟雾的技术问题,同时达到利用余热进行发电的效果。本专利技术解决其技术问题所采取的技术方案是:一种脱硫后湿烟气“减白”协同余热发电的方法,包括:烟气经过烟气降温器降温后进入脱硫塔,脱硫后的烟气经烟气冷凝器冷凝、烟气升温器加热后通过烟囱排放,烟气降温器与烟气升温器形成回路;通过烟气降温器的换热工质携带的热量,首先被发电工质汽化器吸收,剩余热量通过烟气升温器用于烟气再热;发电工质汽化器汽化后的发电工质,推动汽轮机转动,进而带动发电机发电发电工质通过发电工质液化器进行液化后,与发电工质汽化器形成循环回路;发电工质液化器与冷源形成冷却循环回路。进一步的,脱硫后的饱和湿烟气先经过烟气冷凝器再通 ...
【技术保护点】
1.一种脱硫后湿烟气“减白”协同余热发电的方法,其特征包括:烟气经过烟气降温器降温后进入脱硫塔,脱硫后的烟气经烟气冷凝器冷凝、烟气升温器加热后通过烟囱排放,烟气降温器与烟气升温器形成回路;通过烟气降温器的换热工质携带的热量,首先被发电工质汽化器吸收,剩余热量通过烟气升温器用于烟气再热;发电工质汽化器汽化后的发电工质,推动汽轮机转动,进而带动发电机发电发电工质通过发电工质液化器进行液化后,与发电工质汽化器形成循环回路;发电工质液化器与冷源形成冷却循环回路。
【技术特征摘要】
1.一种脱硫后湿烟气“减白”协同余热发电的方法,其特征包括:烟气经过烟气降温器降温后进入脱硫塔,脱硫后的烟气经烟气冷凝器冷凝、烟气升温器加热后通过烟囱排放,烟气降温器与烟气升温器形成回路;通过烟气降温器的换热工质携带的热量,首先被发电工质汽化器吸收,剩余热量通过烟气升温器用于烟气再热;发电工质汽化器汽化后的发电工质,推动汽轮机转动,进而带动发电机发电发电工质通过发电工质液化器进行液化后,与发电工质汽化器形成循环回路;发电工质液化器与冷源形成冷却循环回路。2.根据权利要求1所述的一种脱硫后湿烟气“减白”协同余热发电的方法,其特征是,脱硫后的...
【专利技术属性】
技术研发人员:吕扬,杨凤岭,尹鹏,管闯,卢忠阳,蒲伟,禇祯虎,叶沛宁,
申请(专利权)人:山东国舜建设集团有限公司,
类型:发明
国别省市:山东,37
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