Method for recycling saltpeter-production dead steam

Abstract

The invention discloses a method for recycling saltpeter-production dead steam, which comprises the following steps of: 1, collecting the dead steam from a saltpeter slurry barrel and waste incondensable gases discharged from I and II effect evaporating pot heating chambers in a closed buffer tank; 2, performing heat exchange on fine saltpeter water by a heat exchanger to preheat the fine saltpeter water to the temperature of between 50 and 60 DEG C; 3, discharging condensed water after the heat exchange of the dead steam into a wastewater tank, and then returning the condensed water in the wastewater tank into a mine to re-dissolve sodium sulfate mineral substances; and 4, conveying the preheated fine saltpeter water into an evaporating pot through a centrifugal pump to perform evaporation, concentration and crystallization, and then dehydrating, separating, drying, screening and packaging to obtain an industrial anhydrous sodium sulfate finished product. Because a waste dead steam heat source is used, the heat exchanger performs heat exchange on the fine saltpeter water to ensure that the fine saltpeter water is heated to be 6 DEG C, and then the fine saltpeter water is evaporated in the evaporating pot, the waste saltpeter-production dead steam heat energy is fully used, the energy expense is greatly saved, the zero discharge of the waste gasses is basically realized, and thus, the aim of energy conservation and environmental protection is fulfilled and the noise pollution is relieved.

Description

technical field [0001] The invention relates to a method for recycling and utilizing exhaust gas for producing nitrate, and belongs to the technical field of chemical industry. Background technique [0002] At present, in the production process of large-scale industrial anhydrous sodium sulfate, a large amount of exhaust steam is discharged from the tanks of the nitrate slurry in the nitrate workshop. The average temperature of this exhaust steam is about 100 ℃. In the past, these high-temperature gases were directly discharged into the atmosphere. Among them, it is rarely used by people. It not only causes a large loss of heat energy, but also brings serious pollution to the ecological environment. Enterprises spend huge sums of money on comprehensive treatment every year, which is really a great waste. Contents of the invention [0003] The purpose of the present invention is to provide a method for recycling exhausted steam from nitrate production, so as to make full us...

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of large-scale industrial anhydrous sodium sulfate, a large amount of exhaust steam is discharged from the nitrate slurry barrels in the nitrate workshop. The average temperature of this exhaust steam is about 100 ℃. In the past, these high-temperature gases were directly discharged into the atmosphere. It is rarely used by people. It not only causes a large loss of heat energy, but also brings serious pollution to the ecological environment. Enterprises spend huge sums of money on comprehensive treatment every year, which is really a great waste.

Images