NOVELTY - A multi-tube spiral device with air passage for making gas by destructively distilling and cracking biomass, comprises biomass raw material pretreatment system, biomass destructive distillation and cracking system, gas and carbon powder separation and purification system, gas conveying and storing system, carbon powder cooling system, and waste heat utilization system.    USE - Multi-tube spiral device with air passage for making gas by destructively distilling and cracking biomass (claimed).    ADVANTAGE - The device does not influence normal production under the condition of overflowed gas, realizes massive industrial production, lowers production cost, and reduces energy consumption.    DETAILED DESCRIPTION - Multi-tube spiral device with air passage for making gas by destructively distilling and cracking biomass, comprises biomass raw material pretreatment system, biomass destructive distillation and cracking system, gas and carbon powder separation and purification system, gas conveying and storing system, carbon powder cooling system, and waste heat utilization system. The biomass raw material pre-treatment system is in front of the biomass destructive distillation and cracking system. The gas and carbon powder separation and purification system is behind and connected with the biomass destructive distillation and cracking system. The gas conveying storage system is connected with the gas and carbon powder separation and purification system. The carbon powder cooling and collecting system is connected with the gas and carbon powder separation and purification system. An end of the waste heat utilization system is connected with the biomass destructive distillation and cracking system, and the other end is connected with a dryer in the biomass raw material pre-treatment system. The biomass destructive distillation and cracking system has lines of destructive distillation and cracking sleeves, heater and variable frequency speed adjustment motor. The heater is covered around the lines of the destructive distillation and cracking sleeves, each line being internally provided with a spiral feeder and an air discharging passage. A connection pipe is between adjacent destructive distillation and cracking sleeves. The connection pipes are staggered end to end so that the lines of the destructive distillation and cracking sleeves are connected in series to form an S-shaped pipeline. The destructive distillation and cracking sleeve in the last line is a cracking furnace. The front lines are destructive distillation furnaces. A material inlet is at a front end of the first line of the destructive distillation and cracking sleeve. A material discharging port is at a lower end of the destructive distillation and cracking sleeve in the last line. A shaft end of a threaded rod of the spiral feeder is pivoted with a cylinder wall of the destructive distillation and cracking sleeve. The shaft ends of the threaded rods of the spiral feeders in the adjacent destructive distillation and cracking sleeves are connected via a chain, and the lines of the spiral feeders are linked via the variable frequency speed adjustment motor. An INDEPENDENT CLAIM is included for a multi-tube spiral technique with air passage for making gas by destructively distilling and cracking biomass.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic view of a multi-tube spiral device.