The Research And Design Of Energy-Saving And Emission-Reduction In Tobacco Industry

China is the greatest tobacco production country in the world. The total energy consumption in this industry was about910,000tons of standard coal per year. First, through analyzing the process of cigarette production, energy consumption, and water consumption, we found that the boiler water-vapor system was the key cause for large-water and large-energy consumption. Taking Xinzheng Cigarette Factory for example boiler’s water consumption took up48%of the total water consumption. Boiler’s energy consumption took up89%of the total energy consumption.As the power source of the tobacco industry, boilers produce steam both for process and maintenance. The original boiler running process needed to emit large quantities of wastewater. As a result, the plant’s boiler water consumption reached144,000t. In order to solve the large-water and large-energy consumption problem during tobacco industry’s boiler operation, this paper designed a kind of practical tobacco industry boiler wastewater near-zero emissions technology, which is actually applied to Xinzheng Cigarette Factory. Also, this paper analyzed and discussed the effects of the technology application from both theoretical and practical.Our design based on boiler wastewater near-zero emissions technology, including system balancing technology, boiler corrosion scale technology under oxidizing conditions, the core-stated cleaning strengthening equipment security technology. As the boiler feed water, tap water generated steam. We also removed the boiler deaerator which could be used as an intermediate tank, and let reducing hydraulic conditions become oxidizing hydraulic conditions. We broke sewage system circuit and use system balancing device. Computer on-line automatic monitoring and control system was applied.Because of the particularly bad quality of the local water and the corrosion of the condensate water pipeline, the steam quality of the cigarette production must ensure that the moisture content of less than3%in the cigarette factory, we designed a kind of water pretreatment system. Also we invented a kind of non-volatile protective agent to the condensate water called the silicone modified BV-200. The water pretreatment process used the automatic control system. According to the turbidity of the water, the system would automatically switch to quartz sand filters and activated carbon filters to ensure the boiler feed water turbidity of less than4.5FTU water turbidity; the silicone modified BV-200, the best dosage of BV-200was100ppm after the lab simulation test. With the BV-200, the corrosion inhibition efficiency of the condensate water of the carbon steel pipeline could achieve80%. Application tests found that with the backwater went into the boiler, the BV-200would prevent the corrosion and the water scale, the corrosion inhibition efficiency would achieve more than99%, inhibition rate would achieve more than99.9%, it also had the effect of anti-foaming and de-foaming, and it could effectively prevent the boiler priming to ensure that the steam quality of the cigarette factory.Operation and monitoring results showed that the process could achieve energy reduction:under the working conditions of zero sewage, the system balance conditions made the boiler blow down rate from12%to2%, saving water2.4t/a; under the working conditions of oxidizing, and without the deaerator, the process avoided thermal oxygen consumption of13%fresh steam, recycled the heat of high temperature sewage, saved the natural gas fuel8,150,000m3/a, and reduced carbon dioxide emissions1,703t/a, and achieved total economic benefits of about2.6million Yuan...