The invention discloses a zero emission circulating system for sealing treatment of regenerated lead smelting tail gas. A smelting furnace, a gravity dust collector, a bag type dust collector, a waterwashing dust collecting tower, an air compressor, a gas-liquid separator, an alkali washing desulfurizing tower and a circulating pipe are successively arranged according to a flowing direction of the smelting tail gas. By adopting multiple processes to collect dust first, carrying out pressurizing and liquefying to recover CO2 by means of a physical method, carrying out desulfurization and denitrification by means of a chemical method and finally, and supplementing O2 to residual gas to return to a smelting furnace, the smelting tail gas circulates in a closed system and is not discharge toair, so that the desulfurization cost is reduced greatly, the carbon recovery benefit is increased, and meanwhile, solid-liquid separation can be carried out to reduce lead dust residues by means of good solubility of a desulfurization product. The desulfurization product is treated harmlessly favorably. The process does not need high precision removal of sulfur and dust, so that the flue gas treatment difficulty is reduced greatly and the process is the most economical, cleanest and environment-friendly process.

Zero emission circulating system for sealing treatment of regenerated lead smelting tail gas

The invention discloses a method for recycling sodium sulfite by desulfurizing fluid catalytic cracking flue gas, and relates to the technical field of catalytic cracking processes. The method comprises the following steps of: enabling tower bottom slurry as circulating slurry to return to a washing tower to be in contact with fluid catalytic cracking flue gas, controlling the concentration of thecirculating slurry to be 10%-15% by adopting a way of adjusting the amount of supplementing water; and performing evaporative crystallization and centrifugal separation on filtrate obtained by filtering of a part of the tower bottom slurry. The sodium sulfite product with the purity of higher than 90% is obtained by adopting the method, the additional value of the product is high, and the productcan be used as a raw material for producing a concrete conditioner.

Method for recycling sodium sulfite by desulfurizing fluid catalytic cracking flue gas

The invention discloses a desulfurization and denitrification and dust removal integrated method which comprises the following steps: waste gas dust removal, cooling treatment, desulfurization and denitrification reaction, product collection, wastewater treatment and spray water treatment. Chemical bonds of flue gas molecules are broken by activated electrons obtained by discharge of a high-voltage pulse power supply, so that non-equilibrium plasma is obtained at a normal temperature, gas molecules in industrial waste gases are further subjected to oxidation, degradation and other reactions, the pollutants are transformed and react with injected water or alkaline liquid to produce sulfuric acid, nitric acid or particles of salt, and the removal rate of SO2 and NOx and dust removal efficiency can be obviously increased. Meanwhile, direct-current electric precipitation is performed before and after the desulfurization and denitrification reaction, desulfurization and denitrification anddust removal integration are further realized, the desulfurization and denitrification degree and speed are increased, the space occupancy is reduced, the reaction sewage is concentrated and then subjected to evaporative crystallization, recovery of the product is increased, and zero waste discharge is realized.

Desulfurization and denitrification and dust removal integrated method

The invention belongs to the technical field of catalytic cracking or pyrolysis flue gas treatment, and relates to a catalytic cracking or pyrolysis flue gas cloth bag dust removal and ammonia desulfurization combined system and a catalytic cracking or pyrolysis flue gas cloth bag dust removal and ammonia desulfurization combined process. The system comprises a flue gas system, a cloth bag dust removal system, an absorption circulation system, an oxidation air system, a desulfurization agent supply system, an evaporative crystallization system and an ammonium sulfate post-treatment system. According to the invention, a set of the complete dust removal and desulfurization process comprising catalytic cracking or pyrolysis flue gas cloth bag dust removal and ammonia desulphurization device is combined on the basis of the existing dust removal and desulphurization technology, so the desulphurization efficiency is not lower than 99% under the design condition, the SO2 in desulfurized fluegas is not higher than 50 mg/Nm , the requirements of safety, environmental protection and industrial sanitation are met, and the whole process has characteristics of low investment, low energy consumption, no pollution and the like; the waste catalyst collected through the cloth bag dust removal is subjected to complete treatment of hazardous waste recovery, and is treated together with the waste catalyst generated by catalytic cracking; and the ammonia sulfate particles produced through ammonia desulphurization form company products for sale, so secondary pollution is avoided.

Catalytic cracking or pyrolysis device regenerated flue gas efficient cloth bag dust removal and ammonia desulfurization combined system and catalytic cracking or pyrolysis device regenerated flue gas efficient cloth bag dust removal and ammonia desulfurization combined process

A flue gas desulfurization system and a flue gas desulfurization method achieved by using same. The system comprises an absorption tower (1), a slurry conditioner (3), an evaporative crystallization chamber (5), and a lye tank (8). The absorption tower comprises a lower absorption tower section (101) and an upper absorption section (103). The lower absorption tower section (101) is further provided with a venturi absorber (102) connected thereto. A bottom end of the absorption tower (1) is connected to a sodium hydrogen tank (2). An output end of the sodium hydrogen tank (2) is connected to the slurry conditioner (3). The slurry conditioner (3) is connected to a stock solution tank (4) by means of a centrifuge (302). An output end of the stock solution tank (4) is connected to the evaporative crystallization chamber (5) and/or the upper absorption section (103) and/or the lye tank (8). A bottom end of the evaporative crystallization chamber (5) is connected to a top input end of the slurry conditioner (3). An output end of the lye tank (8) is connected to the upper absorption section (103) and an upper part of the slurry conditioner (3). According to the method, sodium alkali is used as the absorbent by-product sulfate.

Flue gas desulfurization system and method

The invention discloses a catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process which adopts a dust removal system, a desulfurization system and a sodium sulfiterecovery system. The dust removal system is a bag type dust collector 1. The desulfurization system is a desulfurization tower 3, the desulfurization tower 3 comprises a spraying layer 4, a demister5 and a chimney 6 are arranged above the spraying layer 4. The bag type dust collector 1 is connected with the desulfurization tower 3 through a booster fan 2. The sodium sulfite recovery system comprises a crystallizer 7, a thickening device 8 and a centrifugal machine 10, wherein the thickening device 8 is arranged before the centrifugal machine 10, the crystallizer 7, the thickening device 8 and the centrifugal machine 10 are sequentially connected through pipes, and a fluidized-bed dryer 11 and a cyclone separator 12 are sequentially connected behind the centrifugal machine 10. The thickening device 8 is also connected with an overflow buffer tank 9, and the overflow buffer tank 9 is also connected with the desulfurization tower 3. The process is high in sodium sulfite recovery rate while meeting current environmental protection standard, obtained products are high in purity, almost no wastewater is discharged, and the catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process has the advantages of being low in operation cost, obvious in economic and environmental benefit and the like.

Liu Xueyan

Papers

Catalytic crackingflue gas dust removal, desulfurization and sodium sulfite recovery process