Most of the equipment for desulfurization of industrial waste gas is tower equipment, which is the desulfurization tower. Desulfurization towers are widely used in granite masonry. They use the principle of water film desulfurization and dust removal, also known as granite water film desulfurization dust collector, or hemp water film desulfurization dust collector. The advantage is that it is easy to maintain, and it can achieve the effects of dust removal and desulfurization (denitrogenation) by formulating different dust removers. Now with the development of FRP technology, desulfurization towers are gradually made of FRP.
Compared with granite desulfurization towers, glass fiber reinforced plastic desulfurization towers have low cost, easy processing, no rust and no rot, and light weight, so they have become the development trend of future desulfurization towers. In addition, 316L stainless steel has three advantages: corrosion resistance, high temperature resistance, and wear resistance. It is also one of the important trends in the development of desulfurization towers. After years of improvement, it has developed into various types of desulfurization towers such as Venturi type, swirl plate type, swirl column type, floating ball type, sieve plate type, and pneumatic emulsification type. The equipment technology has become increasingly mature, each with its own advantages and Insufficient, enterprises can choose different types according to their own needs.
1.Introduction of process flow
The flue gas enters the cylinder of the spray desulfurization tower and forms a large gas-liquid contact interface with the spray of the absorbent slurry during the rising phase of the spray desulfurization tower (the flow rate is 1.5-2m / s), and the flue gas and the liquid mist particles are fully in countercurrent flow. During the landing of the mist particles, the SO2 is absorbed and the dust particles are captured. The wet dust particles flow down to the bottom of the desulfurization tower and are discharged from the overflow hole into the sedimentation tank. The purified gas rising in the cylinder is defogged and dehydrated by a gas-water separator, completes the entire dust removal and desulfurization process, and is then led out through the upper cone portion of the cylinder. The waste liquid is discharged into the sedimentation tank through the overflow hole at the bottom of the cylinder. (The overflow hole has a water seal design to prevent air leakage, and a cleaning hole is provided to facilitate the bottom cleaning of the cylinder.) After precipitation (deashing) and adding alkali (regeneration) After recycling. At the same time, in order to facilitate the maintenance of the desulfurization system and cope with emergency situations, a bypass flue can be built together under conditions.
2. Principles of chemical reaction in process
The main concern here is the recycling of waste liquid. It can be divided into two methods: "sodium-calcium double-alkali method" and "soda-base single-alkali method" according to the user's desulfurization requirements and operating costs. The sodium-calcium double-alkali method is The use of soda ash desulfurization and slaked lime regeneration method reduces the use of soda ash, but to the soda ash mono-alkali method, an additional regeneration tank and a set of agitation tank stirring device are required; the soda ash mono-alkali method is relatively simple, and the soda ash can be added regularly in the clear water tank to achieve desulfurization effect.
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