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Zhengzhou Sanhe Environmental Protection Technology Co., Ltd
Double alkali desulfurization treatment equipment
NegotiableUpdate on 02/05
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Overview
Double alkali desulfurization treatment equipment
Product Details
Double alkali method (Na)2CO3／Ca(OH)2）It is based on the lime method combined with the sodium alkali method, using sodium salts that are easily soluble in water, and using sodium alkali to absorb SO inside the absorption tower2The absorbed desulfurization solution is regenerated in the regeneration tank using inexpensive lime, thereby enabling the recycling and absorption of sodium ions.
Lime reduction regeneration, the regenerated absorbent is recycled and reused without wastewater discharge. Under the principles of advanced technology, reliable operation, and economic rationality, the process flow is designed to minimize one-time investment, save energy and reduce consumption, and facilitate system maintenance.
2
2The flue gas is removed by a bag filter and then enters the desulfurization tower. The flue gas spirals upwards on the guide plate and comes into contact with the desulfurization liquid, atomizing the desulfurization liquid into droplets with a diameter of 0.1-1.0mm, forming a good atomization absorption zone. The alkaline desulfurizer in the flue gas and desulfurization solution fully contacts and reacts in the atomization zone, completing the desulfurization absorption and further dust removal of the flue gas. The flue gas after desulfurization enters the fan directly through the air outlet on the tower side and is discharged through the chimney.322The desulfurization solution adopts an external circulation absorption method. The desulfurization solution that has absorbed SO2 flows into the regeneration tank and undergoes regeneration reaction with newly arrived lime water. The reacted slurry flows into the sedimentation regeneration tank for sedimentation. When one sedimentation regeneration tank is filled with sediment, the slurry switches to another sedimentation regeneration tank, and then the sediment in this regeneration tank is manually cleaned. The waste residue is dried and transported for treatment. After regeneration and sedimentation, the upper liquid in the circulating pool is pumped into the desulfurization tower for circulation. In addition, due to the water carried by the slag, some sodium ions are lost in the desulfurization solution, so a small amount of pure alkali or waste alkali solution needs to be supplemented in the circulating pool.32Principles of Chemical Reactions
2The basic chemical principles can be divided into two parts: desulfurization process and regeneration process. Absorption of SO inside the tower2Na3CO2＋SO
＝Na2SO3＋CO2（1）232NaOH＋SO
This process combines the characteristics of lime method and sodium alkali method, solves the problem of easy scaling in the lime method tower, and has the advantage of high absorption efficiency of sodium alkali method. The by-products of desulfurization are calcium sulfite or calcium sulfate (after oxidation). Calcium sulfite combined with synthetic resin can produce a new type of composite material called calcium plastic; Or oxidize it to make gypsum; Alternatively, it can be directly mixed with fly ash to increase its plasticity and enhance its strength as a base layer material for paving. Compared with the magnesium oxide method, calcium salts are not polluting, so they do not produce secondary pollution of waste residue. At present, wet flue gas desulfurization technology is widely used, accounting for more than 85% of the total number of FGD devices in the world. The double alkali method is widely used in China due to its simple desulfurization process, good operational stability, high desulfurization efficiency, low desulfurization cost, and suitability for China's national conditions. Considering the specific situation of glass kiln flue gas treatment, and taking into account factors such as process maturity, system stability, engineering investment, and operating costs, the dual alkali desulfurization process is chosen.
Introduction to dual alkali desulfurization process
The double alkali method is a widely used flue gas desulfurization technology for small and medium-sized boilers, developed to overcome the disadvantage of easy scaling in the limestone lime method. There are many types of double alkali methods, and the most commonly used one is the sodium calcium double alkali method.232Sodium calcium double base method2CO
--Ca(OH)
】Using pure alkali to absorb SO
Lime reduction regeneration, the regenerated absorbent is recycled and reused without wastewater discharge. Under the principles of advanced technology, reliable operation, and economic rationality, the process flow is designed to minimize one-time investment, save energy and reduce consumption, and facilitate system maintenance.
2
2The flue gas is removed by a bag filter and then enters the desulfurization tower. The flue gas spirals upwards on the guide plate and comes into contact with the desulfurization liquid, atomizing the desulfurization liquid into droplets with a diameter of 0.1-1.0mm, forming a good atomization absorption zone. The alkaline desulfurizer in the flue gas and desulfurization solution fully contacts and reacts in the atomization zone, completing the desulfurization absorption and further dust removal of the flue gas. The flue gas after desulfurization enters the fan directly through the air outlet on the tower side and is discharged through the chimney.322The desulfurization solution adopts an external circulation absorption method. The desulfurization solution that has absorbed SO2 flows into the regeneration tank and undergoes regeneration reaction with newly arrived lime water. The reacted slurry flows into the sedimentation regeneration tank for sedimentation. When one sedimentation regeneration tank is filled with sediment, the slurry switches to another sedimentation regeneration tank, and then the sediment in this regeneration tank is manually cleaned. The waste residue is dried and transported for treatment. After regeneration and sedimentation, the upper liquid in the circulating pool is pumped into the desulfurization tower for circulation. In addition, due to the water carried by the slag, some sodium ions are lost in the desulfurization solution, so a small amount of pure alkali or waste alkali solution needs to be supplemented in the circulating pool.32Principles of Chemical Reactions
2The basic chemical principles can be divided into two parts: desulfurization process and regeneration process. Absorption of SO inside the tower2Na3CO2＋SO
＝Na2SO3＋CO2（1）232NaOH＋SO
＝Na
SO2+H2O （2）33Na2SO3＋SO3＋H2O＝2NaHSO2（3）32The above three equations vary depending on the acidity or alkalinity of the absorbing solution. When the alkalinity is high (pH>9), equation (2) is the main reaction; When the alkalinity slightly decreases, equation (1) is the main reaction; When alkaline to neutral or even acidic (5<pH<9), the reaction follows equation (3). Regeneration with hydrated lime3Ca（OH）3＋Na2SO3＝2NaOH＋CaSO3 Ca（OH）2
＋2NaHSO2＝Na3SO
