Gasification tar monitoring system, gasification tar monitoring method and gasification tar monitoring device

A method for monitoring a gasification tar using a gasification tar monitoring system, the gasification tar monitoring system comprising a dust collector, a pressure controller, a dryer, a gas heat-insulation device, a gas pool, a gas detector, an optical monitor and a computer which are sequentially connected,

• wherein the dust collector is configured to filter solid particles in a gas when disposed at an exit of a gasifier;
• the pressure controller is configured to control a flow rate of the gas;
• the dryer is configured to control a humidity of the gas;
• the gas heat-insulation device is configured to control a temperature of the gas;
• the gas pool is configured to carry the gas;
• one end of the gas detector is connected to a laser through a first optical fiber, the laser is configured to irradiate the gas in the gas pool to generate a Raman scattering light, and the gas detector is configured to collect the Raman scattering light;
• another end of the gas detector is connected to the optical monitor through a second optical fiber, and the optical monitor is configured to adjust and amplify a light signal of the Raman scattering light;
• and the computer is configured to output a Raman spectrum and a composition and content of a tar;
• wherein the method comprises:
• inputting a gaseous standard compound with different concentrations into the gasification tar monitoring system sequentially, and outputting at least one group of standard characteristic spectrum peaks;
• determining a standard curve function of the gaseous standard compound through heights of spectrum peaks of each group of standard characteristic spectrum peaks and concentration of the gaseous standard compound;
• inputting a gas into the gasification tar monitoring system, and outputting at least one group of characteristic spectrum peaks;
• determining a type of a compound by comparing the at least one group of characteristic spectrum peaks with the group of standard characteristic spectrum peaks;
• determining a concentration of the compound corresponding to a height of a characteristic spectrum peak of the at least one group of characteristic spectrum peaks through the standard curve function corresponding to the compound;
• and
• determining a concentration of a tar in the gas through the concentration of the compound.