Gas-solid ejector and circulating fluidized bed boiler system

The utility model provides a gas-solid ejector and a circulating fluidized bed boiler system. The gas-solid ejector comprises a hopper, an injection pipe and a nozzle connected with a high-pressure air source, wherein the injection pipe comprises an inlet section, a mixing section and a diffusion section, the minor-caliber end of the inlet section and the minor-caliber end of the diffusion section are communicated with two ends of the mixing section respectively, an end cover is arranged at the heavy-caliber end of the inlet section, a discharge hole is formed in the heavy-caliber end of the diffusion section, the hopper is arranged on the inlet section of the injection pipe, a feed opening of the hopper is communicated with inside of the injection pipe, the nozzle penetrates through the end cover and stretches into the inlet section, and working layers made of high-temperature-resistant wearing-resistant materials are all formed on the outer surfaces of the inner wall surface of the hopper, the inner wall surface of the injection pipe and part (stretching into the inlet section) of the nozzle. The gas-solid ejector can convey high-temperature circulating ash stably so as to establish good ash circulation and solve the wind returning and coking phenomena of the feeding hole.