Methanol-to-gasoline combined technology

The invention relates to a methanol-to-gasoline combined production technology, and belongs to an important link of a coal-preparing high-clean energy technology. The technology includes the steps: methanol is heated, then a great part of the methanol enters a dimethyl ether reactor, is subjected to crude dehydration, then enters a gasoline transformation reactor and is further dehydrated, and the product passes through a heat exchanger and then is subjected to oil-water separation; crude gasoline is separated to obtain dry gas through a deethanizer; a part of the dry gas is subjected to heat exchange through the heat exchanger, then enters a circulation compressor and together with a dimethyl ether reactor outlet product enters a conversion reactor, so as to achieve the temperature dropping and control purposes; the gasoline having the dry gas removed enters a debutanizer, and removed liquefied gas and the other part of methanol steam undergo a superimposed etherification reaction; crude gasoline coming out of the debutanizer is separated to obtain the product gasoline and heavy oil by a gasoline separation tower; the heavy oil and the other part of the dry gas coming out of the deethanizer are together modified by a transalkylation catalyst to obtain a gasoline component, dry gas and liquefied gas.