Multi-combination crude oil dehydration heating system

The invention discloses a multi-combination crude oil dehydration heating system which includes, in a successive connecting manner, a crude oil clear water heat exchanger, an electric dehydrator and an oil purifying pot. A dehydration heating furnace is disposed between the crude oil clear water heat exchanger and the electric dehydrator. The crude oil clear water heat exchanger is successively connected to a clear water-sewage heat exchanger and a clear water pot through additional individual pipelines. The crude oil clear water heat exchanger, the clear water-sewage heat exchanger and the clear pot are connected to each other head-to-tail to form a closed circulating pipeline. The pipeline between the clear pot and the crude oil clear water heat exchanger is connected to a solar heat collector and an air-source heat pump, wherein the solar heat collector and the air-source heat pump are connected in parallel on the pipeline. In the invention, crude oil is heated to dehydrate by solar energy, the air-source heat pump and discharged sewage in a combined manner, wherein the discharge sewage is used as a residual heat resource for providing a low-temperature heat source and the solar energy and the air-source heat pump are mutually used as an auxiliary heat source. Through reasonable cooperation among the three heat sources, a defect that an original heating method is high in energy consumption is effectively solved.