Distribution and injection module and system for SNCR (Selective Non Catalytic Reduction) flue gas denitrification system

The utility model provides a distribution and injection module and system for an SNCR (Selective Non Catalytic Reduction) flue gas denitrification system. The distribution and injection module comprises a compressed air pipeline and a urine solution pipeline which are connected in parallel; the compressed air pipeline and the urine solution pipeline connected in parallel are connected with a spray gun; a first manual valve, a compressed air main valve and a pressure detecting and adjusting device are sequentially arranged on the compressed air pipeline; a compressed air bypass is connected with the compressed air pipeline in parallel; one end of the compressed air bypass is connected onto a pipeline behind the first manual valve and before the compressed air main valve; the other end of the compressed air bypass is connected onto a pipeline behind the compressed air main valve and before the pressure detecting and adjusting device; a bypass valve is arranged on the compressed air bypass. The distribution and injection module provided by the utility model has the benefits that flowing conditions of compressed air and urine solution can be monitored in real time and are adjusted and controlled in time; the corresponding bypass is arranged on the compressed air pipeline; when faults occur or maintenance is required, the compressed air pipeline can be switched to the bypass in time, so that the operation stability of the system is improved.