Steam self-supply system for production of sodium nitrate/nitrite

The utility model relates to a steam self-supply system for production of sodium nitrate/nitrite, which is suitable for preparing the sodium nitrate/nitrite. A desalting water tank is connected with a residual heat boiler via a coal economizer, and the residual heat boiler is connected with an ammonia oxidation reactor; the coal economizer is communicated with a crystallizer via an alkali absorber, a preheating device, an I-effect evaporator and an II-effect evaporator; the preheating device is connected with the desalting water tank; a transformer is respectively connected with the I-effect evaporator and a centrifuge; the II-effect evaporator is respectively connected with an alkali dissolution working section and the crystallizer; and the alkali dissolution working section is connected with the centrifuge via a condenser and the crystallizer. The steam self-supply system disclosed by the utility model has the advantages of significant energy-saving benefits, convenience in process regulation and emission r