热泵技术在火电厂CO_2减排中的应用研究

The Applied Research about Heat Pump Technology Used for Carbon Emission Reduction in Thermal Power Plant

二氧化碳气体被普遍认为是导致全球气候变暖的重要原因之一。我国的一次能源是以煤炭为主,燃煤的电力和热力企业的二氧化碳排放量约占一半。利用热泵技术回收汽轮机乏汽余热,将热量用于MEA溶液的再生,可以降低火电厂的碳捕捉成本。以600MW机组为例,安装改进型碳捕捉装置的机组热效率与安装原碳捕捉装置的机组相比,得到安装改进型碳捕捉装置的机组热效率有明显提高。对于改进型碳捕捉系统,碳捕捉率为90%时所需的抽汽量为317.04t/h,热效率下降7.35%,比传统的方法提高5.41%。随着碳捕捉率的变化,湿冷机组效率变化曲线的斜率比直接空冷机组大,但随着碳捕捉率的增大,二者的差距越来越小。

The carbon dioxide gas was revealed generally one of substantial cause global climate warming. The main primary energy of our country is coal, and the enterprises＂ carbon dioxide discharge composes half approximately. The turbine exhaust steam afterheat may be used by heat pump technology, and the heat is used for the regeneration of MEA solution to reduce the carbon capture cost. As 600MW units for example, through comparing the thermal efficiency of the unit installed advanced carbon seizure device and the unit installed advanced carbon seizure device, the result indicates the original carbon seizure device, the result indicates the thermal efficiency of installed advanced carbon seizure device have distinct enhancement. For the advanced carbon system, the steam extraction quantity is 317.04 t/h when the carbon capture rate is 90%, and the thermal efficiency drops 7.35% , enhancing 5.41% compared to the traditional method. Along with the carbon captureg rate changing, the slope of the wet cold unit efficiency change curve is bigger than the direct air - cooled unit, but the two ＂s disparity gets smaller along with carbon capture rate enlargement.