The principle of desulfurization and denitration refers to restoring the generated NOX into N2, so as to remove the NOX in the flue gas. According to the governance process, it can be divided into wet denitration and dry method; The alkali absorption method, selective catalytic reduction method, non -selective catalytic reduction method, adsorption method, ion activation method, etc.; Some researchers at home and abroad have also developed the method of using microorganisms to deal with NOX exhaust gas;
is simply the process of using alkali neutralization in desulfurization and denitration, and desulfurization is: sulfur dioxide contained in the boiler flue gas; decreased sale is: nitrogen oxides contained in the boiler flue gas; desulfurization The process is to make alkaline desulfurization agents (such as limestone, CAO, sodium hydroxide, etc.) into pulp, mix with boiler flue gas, sulfur dioxide encounters water into acid, react with alkaline desulfurization agent to generate CASO4 (calcium sulfate) and other desulfurization The product process is similar to the principle of denitration and desulfurization, that is, the denitration agent is replaced with ammonia or urea.
The principle of desulfurization and denitration Chemical principle: SO2 in flue gas is essentially acidic, and SO2 can be removed from the flue gas by reaction with the appropriate alkaline substance. The most commonly used alkaline substances for flue gas are limestone (calcium carbonate), lime (calcium oxide, CAO) and cooked lime (calcium hydroxide). Limestone is rich in yield, so it is relatively cheap. Lime and cooked lime are made by heating. Sometimes other alkaline substances such as carbonate (pure alkali), magnesium carbonate and ammonia. The alkaline substance used reacts with the SO2 in the flue gas, which produces a mixture of sulfate and sulfate (different alkaline substances used, these salts may be calcium salt, sodium salt, ammonium, or ammonium. Salt). The ratio between sulfate and sulfate depends on the process conditions. In certain processes, all sulfate is converted into sulfate. The response between SO2 and alkaline substances or occurs in alkaline solutions (wet flue flue gas desulfurization technology), or wet surfaces of solid alkaline substances (dry or semi -sulfur desulfurization technology). It in the wet flue gas desulfurization system, alkaline substances (usually alkaline solutions, more cases of alkali slurry) meet with the flue gas in the spray tower. SO2 is dissolved in water in the flue gas to form a dilute acid solution, and then neutralize the alkaline substance dissolved in the water. The reaction generated sulfate and sulfate are precipitated from the aquatic solution, and the precipitation depends on the relative solubility of different salts in the solution. For example, the solubility of calcium sulfate is relatively poor, so it is easy to precipitate. The solubility of sulfate and ammonium sulfate is much better. In SO2 in the dry method and semi -dry flue gas desulfurization system, the solid alkaline absorbent or the smoke can be sprayed into the flue air flow through the alkaline absorbent bed, which makes it contact with the flue gas. In any case, SO2 is directly react with solid alkaline substances to generate corresponding sulfate and sulfate. In order to enable this reaction, solid alkaline substances must be very loose or quite fine. In the semi -sulfur desulfurization system, water is added to the flue gas, forming a liquid film on the surface of alkaline substance particles, SO2 dissolved into the liquid film, accelerating the reaction with solid alkaline substances.
Pay content for time limit to check for freenAnswer Hello, you will answer this question. You need a little time to typing. Please wait patiently. We are checking the appropriate answer for you, please wait, we will answer you as soon as possible, please wait patientlynDear, there are more customers who recently consult with desulfurization and denitration. The following editors will explain it for everyone. Interested friends will take a look. The working principle of desulfurization and denitration means that the generated NOX is restored to N2, so as to remove the NOX in the flue gas. According to the treatment process, it can be divided into wet denitrification and dry nitration. It mainly includes: acid absorption method, alkali absorption method, selective catalytic restoration method, non -selective catalytic restoration method, adsorption method, ion activation method, etc. Some researchers at home and abroad have also developed a microbial treatment of nitrogen oxide exhaust gas with nitrogen oxide exhaust gas Methods. Simply speaking, desulfurization and denitration are the process of using alkali neutralization. Desulfurization is to remove the sulfur dioxide contained in the boiler flue gas and remove the nitrogen oxide contained in the boiler flue gas. Desert is a process of alkaline desulfurization agent (such as limestone, calcium oxide, sodium hydroxide, etc.). ) Made in a slurry, mix with the boiler flue gas, the sulfur dioxide becomes acidic, and reacts with alkaline desulfurization agent to generate calcium sulfate (calcium sulfate (calcium sulfate) and other desulfurization final products. The principle of denitration is similar to desulfurization.
The integration of desulfurization and denitration dust removal is generally used for equipment. The process process is: flue gas → residual heat recovery device (coal provincial) → heat exchanger → dust removal (determined according to the situation) → denitration desulfurization and dust removal integrated tower → heat exchanger → emission. The characteristics are: ① high temperature resistance, the main structure is made of modified glass reinforced fiber reinforcement materials. ②The acidic and alkali, corrosion resistance, aging resistance, long service life, and small maintenance. ③ Small size, light weight, small area, small foundation. ④ Little resistance, water saving, power saving, and low operating costs. ⑤ Beautiful shape, bright color, small, good visual effects. ⑥ Washing work principle, high dust removal and desulfurization efficiency, capturing harmful gas.理 The design of dehydration board is reasonable, unique, and has good dehydration effect, and less corrosion of the fan. iu's simple operation, convenient use, high degree of automation, small maintenance volume, low infrastructure and operation costs, easy operation, management, maintenance, high operating rate, and adapting to various working environments. 烟 The total amount of sulfur in the flue gas and the concentration of SO2 in the flue gas fluctuating adaptability.
Simply speaking, desulfurization and denitration are the process of using alkali neutralization. Desulfurization is the sulfur dioxide contained in the boiler flue gas. Deserting is the nitrogen oxide contained in the boiler flue gas. Dose (such as limestone, CAO, sodium hydroxide, etc.) is made into a slurry, mixed with boiler flue gas, sulfur dioxide encounters water into acid, and react with alkaline desulfurization agent to generate CASO4 (calcium sulfate) and other desulfurization ultimate products. The principle of similarity is that the denitration agent is replaced with ammonia or urea
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