大庆石化公司炼油厂制氢装置中变气节能改造工艺设计
发布时间：2018-08-05 17:43
【摘要】：大庆石化公司炼油厂制氢装置采用烃类水蒸气转化法,原始设计是中变反应之后由中变反应器出来的中温中变气直接给除盐水加热,这样不但造成能量浪费,而且还会使后部的空冷和水冷换热器的负荷过大,尤其是夏季,严重时直接威胁到了变压吸附系统(PSA)的稳定运行。鉴于以上原因,通过对装置现有流程的分析,最终确立了余热回收技术改造方案,即在中变气第二分液罐之后,中变气空冷器之前加装一台余热回收器,利用中变气的过剩热量与界区来的除盐水进行换热,利用中温中变气余热提升除盐水温度。由于换热后的除盐水要进入除氧器除氧,而水中的溶解氧含量与温度成反比,这样就会节省除氧器蒸汽使用量。而经过换热之后的中温中变气温度降低,减少了空冷的负荷。该工艺改造实施后,预计可将进入除氧器的除盐水的温度至少升高到77℃,同时减少除氧器中的1.0 MPaG蒸汽的消耗量和中变气空冷器的用电量,起到节能的效果;同时可以保证在装置较大负荷运行时除氧器内的温度达到除氧要求,有利于装置的平稳运行。对整个工艺改造的投资估算,融资方案,成本费用估算,项目获利能力等经济指标的计算结果表明,本论文提出的工艺改造方案经济效益良好。该工艺改造的投资财务内部收益率为15.85%,高于行业基准收益率。本论文所实施的改造项目完成后炼油厂制氢装置的能耗减少量为976.12 MJ/吨工业氢,即23.31 kg标准油/吨工业氢。综上所述,经过优化工艺流程的制氢装置,能够从多个方面降低装置能耗和生产成本,能量利用也将更加合理。
[Abstract]:The hydrogen production unit of Daqing Petrochemical Company adopts the method of steam conversion of hydrocarbons. The original design is that the medium temperature and medium change gas produced from the medium temperature reactor directly heat the desalted water after the intermediate change reaction, which not only results in energy waste. Moreover, the load of the air-cooled and water-cooled heat exchangers in the rear part is too large, especially in summer, which directly threatens the stable operation of the pressure swing adsorption system (PSA). In view of the above reasons, through the analysis of the existing process of the plant, the technical retrofit scheme of waste heat recovery was finally established, that is, after the second liquid tank of the medium variable gas, a waste heat collector was installed before the intermediate variable air cooler. The excess heat of medium variable gas and the desalted water from the boundary area are used to exchange heat, and the temperature of desalted water is raised by using the residual heat of medium temperature variable gas. Since the desalted water after heat transfer has to enter the deaerator and the dissolved oxygen content in the water is inversely proportional to the temperature, the amount of steam used in the deaerator will be saved. After heat transfer, the medium temperature of medium temperature is reduced and the load of air cooling is reduced. It is expected that the temperature of desalted water entering the deaerator can be raised to at least 77 鈩，
本文编号：2166521
[Abstract]:The hydrogen production unit of Daqing Petrochemical Company adopts the method of steam conversion of hydrocarbons. The original design is that the medium temperature and medium change gas produced from the medium temperature reactor directly heat the desalted water after the intermediate change reaction, which not only results in energy waste. Moreover, the load of the air-cooled and water-cooled heat exchangers in the rear part is too large, especially in summer, which directly threatens the stable operation of the pressure swing adsorption system (PSA). In view of the above reasons, through the analysis of the existing process of the plant, the technical retrofit scheme of waste heat recovery was finally established, that is, after the second liquid tank of the medium variable gas, a waste heat collector was installed before the intermediate variable air cooler. The excess heat of medium variable gas and the desalted water from the boundary area are used to exchange heat, and the temperature of desalted water is raised by using the residual heat of medium temperature variable gas. Since the desalted water after heat transfer has to enter the deaerator and the dissolved oxygen content in the water is inversely proportional to the temperature, the amount of steam used in the deaerator will be saved. After heat transfer, the medium temperature of medium temperature is reduced and the load of air cooling is reduced. It is expected that the temperature of desalted water entering the deaerator can be raised to at least 77 鈩，
本文编号：2166521
本文链接：https://www.wllwen.com/kejilunwen/huagong/2166521.html
