TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The device further comprises a reacting liquid reflux system comprising an optical bioreactor discharging port. The optical bioreactor discharging port is provided with a discharging pipe. The discharging pipe is provided with a returning pipe. The returning pipe is installed on a sludge pump which is connected to an inlet orifice. Each tower plate is uniformly distributed small vent holes. The length of the quartz-side optical fiber plate is half of the diameter of the reaction tank. The length of the U-shaped heat exchanger tower plate is 5/6th the diameter of the reaction tank, which provides photosynthetic light and dark hydrogen production fermentation of biomass. A fixed partition wall is arranged at the tail end of the vertical quartz side optical fiber and U-shaped heat exchanger tower plate, where the partition exceeds upwards corresponding to the column surface height, and exceeds downwards corresponding to a lower tower plate surface. The tower plate-type fermentation reaction tank is a cylindrical steel plate reactor whose inner wall is coated with an anticorrosive paint, and outer wall is equipped with an insulating layer and a protective layer. The outlet of the air chamber is provided with a clapboard. The upper part of the air chamber is evenly set with air passages. A ventilator is set with an air cap. The air cap is in inverted cone shape. The upper end of the air cap is sealed and lower end is completely hollow. The conical side of the air cap is uniformly distributed with venting channels. The returning hydrogen and gas-liquid passes by the venting channels to an air inlet, which leads to the complete heat exchange. The inner cavity of the air chamber comprises an air outlet, a throttle valve, a gas-liquid separating plate and a gas storage chamber. The outlet side of the gas storage chamber is provided with gas-liquid separating-shaped clapboard, and the upper part is set with small holes. The quartz optical fiber side tower plate is horizontally and uniformly arranged with a soda glass tube. The soda glass tube is made of organic glass clapboard. The clapboard is connected to a polysulfide rubber and glass steel reaction tank walls. A sodium glass pipe is equipped with the quartz side optical fiber. The side of the quartz optical fiber is connected to a solar light collecting device. The U-shaped heat exchanger tower plate comprises a tower plate and a U-shaped heat exchange tube. The U-shaped heat exchange tube is horizontally arranged on the tower plate. The U-shaped heat exchange pipe of an hot water inlet of an electrical heating water tank is connected to a cold water outlet of the electrical heating water tank.