Integrated equipment of desulfurization and denitration
key word：Heat exchange element
Product description
1. Integrated design of desulfurization and denitration
1.1 overview of integrated desulfurization and denitrification design
The world's attention to environmental protection makes the requirements of flue gas emission standards of thermal power plants more and more high. Coupled with the traditional desulfurization device and denitration device, there is no way to meet the development requirements of the times. Relevant personnel analyzed such problems and effectively combined desulfurization device with denitration device, thus changing the traditional mode and forming a new integrated desulfurization and denitration device.
1.2. Process design
It can be seen that when the flue gas passes through the cyclone, it will be removed for the first time, and large particles can be recovered. Therefore, the large particle dust after dust removal has been recovered. After the self-excited dust collector, most of the dust removal, desulfurization and denitrification work has been completed. After one impact washing tower, the dust removal, desulfurization and denitrification work has been carried out again, and finally the steam is used The water separator separates them, so as to further carry out dust removal, desulfurization and denitrification.
1.3. Material balance
In the process design, the material balance follows the law of conservation of mass to obtain the input and output and the quantitative calculation process of the logistics and amount in the case, and also obtains the balance of some equipment and materials [2]. Material balance is an important step in process design, which plays an important role in the selection of pipeline and the design of reactor.
1.4. Heat calculation
Heat calculation can also be called energy balance calculation. Thermal calculation is mainly based on the first law of thermodynamics. Through heat calculation, the material balance in the industrial production process is calculated. In the process of calculation, it needs to provide materials or energy removed by materials. And this kind of energy can also be called various forms of energy, such as heat energy, chemical energy, kinetic energy and so on, and the most obvious in the production process is heat energy.
2. Preparation of the catalyst
2.1. Immersion precipitation method. According to the reasonable proportion of ammonium metavanadate solution and copper nitrate, prepare it as a backup, and then turn the appropriate amount of molecular sieve into particles. Finally, it is used as the carrier of the catalyst. After drying and baking, it is mixed with acidic copper sulfate solution. After soaking for 2 hours, ammonium metavanadate solution is added correspondingly, and its pH value is adjusted to alkaline. On this basis, drying and baking are carried out The catalyst is ready for the experiment.
2.2. Blending method. Ammonium metavanadate and copper nitrate were mixed in a reasonable proportion. The molecular sieve was powdered and added into the mixture. The mixture was evenly stirred, and an appropriate amount of water was added into the mixture. After that, the catalyst had a preliminary prototype, and then it was made into particles with a diameter of about 5mm At last, the catalyst was placed in the reactor to prepare for the experiment.
2.3. Multi component impregnation. Firstly, the molecular impregnation was put into the acid solution of vinylidene vanadate. After drying and roasting, it was again put into copper nitrate solution for impregnation. After the impregnation, it was dried and roasted. In order to obtain a better load, the impregnation could be repeated several times in this process. After the catalyst was prepared, it was filled in the reactor for test.
3. Experimental process
In the experiment, one is to make a reasonable quantitative analysis of the flue gas. When the flue gas enters the air, it analyzes it after combustion, and measures the existing content of nitrogen and oxygen compounds and sulfur dioxide after the reaction of the gas regeneration; Secondly, the prepared mixture enters the reactor, and it will immediately present its catalytic reaction. Then, the residual gas and sulfur trioxyte will be absorbed by its equipment, then baked with desiccant. Finally, the results are analyzed. Through the measurement of its process, the content of nitrogen oxide and sulfur dioxide will be obtained; Thirdly, after the flue gas is simulated into the air, the reactor performs desulfurization and desqualizing catalytic reaction after the flue gas enters through the heat exchanger. The analysis of the reaction situation is carried out by the analyzer to measure the content of nitrogen oxide and sulfur dioxide in the gas in this experiment.
4. Developing research
4.1. Determination of the best method for the preparation of catalyst. The activity of desulfuration and desalting of catalyst was made by various preparation methods. In this experiment, it was found that the temperature of catalyst decreased to some extent for desulfurization efficiency and denitrification efficiency with the increase of air speed. The results showed that the catalyst prepared by impregnation precipitation had high desulfurization and denitrification activity, and the effect of the catalyst was between the two before the multi-component impregnation; Although the catalyst prepared by blending method can completely remove sulfur dioxide in flue gas at low air speed, the effect of desalting is still poor. This situation is not suitable for the experiment of simultaneous desulfurization and denitrification.
4.2. Comparison of denitrification efficiency in catalyst. The activity of the catalyst prepared by blending method will change with time at low air speed. It has certain effect on Desulfurization of the catalyst prepared by blending method in the experiment. The denitrification efficiency has a certain decrease after it increases. The reason for the internal content analysis in the reference literature is that sulfide can affect the catalyst because sulfide is part of the catalyst load The denitrification effect was decreased in a few minutes. The analysis results were that the presence of excessive catalyst in sulfide would cause sulfur dioxide poisoning.
4.3. Efficiency evaluation of catalyst. In order to achieve the best effect of desulfurization and denitrification, the first step is to have a certain accuracy for the process parameters, mainly aimed at the determination of the air speed change and temperature change. At the same time, the temperature is fixed, and the intake velocity is changed under the volume of catalyst, and the removal effect obtained at different gas speeds is measured.
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