Gas washing and cooling device

The utility model provides a coal gas washing and cooling device which comprises an ascending pipe and a descending pipe, the ascending pipe and the descending pipe are connected in a sealing mode, the included angle between the ascending pipe and the descending pipe is 30-60 degrees, and a spray head is installed in the descending pipe and communicated with an ammonia water storage tank through a pipeline. The downcomer comprises a first connecting pipe, a reducer pipe and a second connecting pipe which are communicated in sequence, the reducer pipe comprises a contraction pipe, a throat pipe and a diffusion pipe which are communicated in sequence, and the nozzle is installed at the throat pipe. According to the coal gas washing and cooling device, the ascending pipe is arranged, so that large-particle dust settles when coal gas ascends in the ascending pipe; then the coal gas enters the downcomer, the coal gas is shrunk at the shrinkage pipe, the flow speed is increased, and circulating ammonia water is spr