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某丙烯酸及酯装置热水系统主要包括用热单元和换热器,用热单元所用的热水采用外部循环冷却水作为水源,存在资源浪费现象。对该装置热水系统节能潜力进行分析,利用KBC公司的Petro-SIM软件进行计算和评估,确立改造方案。使用冷凝液作为热媒水,停止使用原先的循环冷却水;将敞开式换热系统改为闭路自循环取热换热系统,避免水质和外界温度、压力变化对本装置工艺的影响;将各换热器来的冷凝液收集到一个缓冲罐中,混合后的冷凝液温度约92℃,总流量约90t/h,将这部分冷凝液作为热源,使用新增的板式换热器加热改造后的闭路水;为保证生产的稳定性和连续性,保留原来的热水加热器,当新增热水加热器出口温度达不到要求时,用原热水加热器再进行加热;增加一个循环水缓冲罐,当闭路循环水水量不够时,通过外界补充不足的循环水。利用装置冷凝液取代低压蒸汽进行循环水换热后,用来进行循环水换热的低压蒸汽不再使用,节约低压蒸汽20t/h,装置实现节能量6.08kt标油/a,实现经济效益716万元/a。
An acrylic acid and ester plant hot water system mainly includes the use of heat units and heat exchangers, the use of hot water unit using external circulating cooling water as a water source, there is a waste of resources. The energy saving potential of the hot water system of the plant was analyzed, and the calculation and assessment were made by using Petro-SIM software of KBC Company to establish the reformation plan. The use of condensate as the heat medium water, stop using the original circulating cooling water; the open heat exchanger system to closed-loop self-cycle heat removal heat exchanger system to avoid water quality and external temperature and pressure changes on the device process impact; The condensate from the heater is collected in a buffer tank. The temperature of the mixed condensate is about 92 ° C., and the total flow is about 90 t / h. This part of the condensate is used as a heat source, and the newly added plate heat exchanger is used to heat the reformed Closed circuit water; in order to ensure the stability and continuity of production, keep the original hot water heater, when the new hot water heater outlet temperature does not meet the requirements, with the original hot water heater and then heating; add a circulating water Buffer tank, when the closed loop water is not enough water, through the outside world to supplement the lack of circulating water. Use of device condensate instead of low-pressure steam for circulating water heat exchanger, used for circulating water heat exchanger low-pressure steam is no longer used, saving low-pressure steam 20t / h, the device to achieve energy saving 6.08kt standard oil / a, to achieve economic benefits 716 Million / a.