TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The step of pre-heating and gasifying before conveying liquid methanol through measuring to reach the conversion device after comprises before conveying the liquid methanol to reach the conversion device, using the heated heat-transfer air stream to heat the deferent sections by first pre-heating to 60 degrees C, heating up to 210 degrees C to gasify it, and then making the gaseous methanol be over-heated to 230-240 degrees C; finally sending the gaseous methanol into the 240-250 degrees C to react.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - The conversion device (11) is set in the first section of heating chamber, the over-heating device (13) is set in the second section of heating chamber, the gasification device (15) is set in the third section of heating chamber; the three sections of the heating chamber are connected through pipeline to form an integer. The combustion-supported air pre-heater (29) is set on the pipeline connected with combustion-supported air blast blower (28) for conveying combustion-supported air to kiln (38), the third section pipeline of the heat medium air blast blower (36) for conveying heat-transfer air stream is used as pre-heating section of the combustion-supported air to pass through the combustion-supported air pre-heater (29). The methanol fuel pre-heater (23) is set on pipeline for conveying methanol liquor to the gasification device (15), the third section of pipeline after the heat-transfer air stream conveyed by the heat medium air blast blower (36) passing through the combustion-supported air pre-heater (29) is used as pre-heating section of methanol fuel to pass through the fuel pre-heater (23). The hydrogen burner (37) matched with kiln (38) is set on two terminals of the pipeline for conveying hydrogen fuel from hydrogen storage tank (34) to kiln (38) and pipeline connected with the combustion-supported air blast blower (28) for conveying the combustion-supported air to kiln (38). Combustion-supported air de-compressor (30) is set on the pipeline of the combustion-supported air pre-heater (29) connected with the hydrogen burner (37). The hydrogen storage tank outlet valve (33), hydrogen de-compressor (32), and flame arrester (31) are set in turn on the pipeline of the hydrogen storage tank (34) connected with the hydrogen burner (37).