The invention relates to a reproduction method for sodium-base flue gas desulfurization liquid, which is characterized in that the flue gas desulfurization liquid containing sodium sulphite and sodium bisulfite is oxidized to a solution containing sodium sulfate, the solution containing sodium sulfate is electrolyzed to a sodium hydroxide solution and a sulfuric acid solution by using bipolar membrane electrodialysis According to the invention, the electrolytic conversion rate of sodium sulfate can reach more than 90%, the obtained sodium hydroxide solution can be used as absorption liquid for a flue gas desulfurization tower, the sulfuric acid by-product is produced simultaneously By-product sulfuric acid can be used as sulfuric acid for treating high hardness and high alkalinity The reproduction method for sodium-base flue gas desulfurization liquid is capable of achieving the purposes of strong brine zero-draining, comprehensive resource utilization and cost reduction

Reproduction method for sodium-base flue gas desulfurization liquid

The invention discloses a wet desulfurization flue gas treatment system and treatment method, and aims at overcoming the defects that at present, the white smoke phenomenon is prone to be formed when desulfurization flue gas is treated and then exhausted to the atmosphere through a chimney, and electric power consumption and investment and operation cost in wet electrostatic precipitation are high. The wet desulfurization flue gas treatment system comprises an electrostatic precipitator, a wet desulfurization tower, a wet phase change condensation precipitator and a chimney which are sequentially arranged in the flow direction of the flue gas; an induced draft fan is installed between the electrostatic precipitator and the wet desulfurization tower, and a liquid outlet is formed in the lower end of the wet phase change condensation precipitator and connected to the wet desulfurization tower through a pipeline; a condensation pipe is arranged in the wet phase change condensation precipitator, a cyclic liquid inlet pipe is connected to one end of the condensation pipe, and a cyclic liquid outlet pipe is connected to the other end of the condensation pipe. Accordingly, the white smoke phenomenon is not prone to be formed when the desulfurization flue gas is treated and then exhausted to the atmosphere through the chimney, the whole treatment system is low in power consumption, the investment and operation cost is reduced, and the treatment system can effectively recycle industrial water.

Wet desulfurization flue gas treatment system and treatment method

A dual-alkali desulphurization energy-saving technique is characterized in that the technique comprises the following steps: flue gas introduced out by a tunnel kiln hood is sent to an air heat exchange system and carries out heat exchange with cold air entering the air heat exchange system from outside; the heated cold air enters a gas generator through a connecting pipeline and is used as an oxidant; the cooled flue gas enters a desulphurization tower through the connecting pipeline and carries out atomization with alkali liquid sprayed from the top of the tower on a swirling plate to facilitate SO2 in the flue gas to be absorbed and react with the sprayed alkali liquid fully; the purified flue which is subjected to desulphurization and washing is discharged into atmosphere after the detection of sulfur dioxide on-line detection system, loop slurry discharged from the desulphurization tower is sent to a regenerative reactor provided with a stirring device, reacts with added slaked lime fully and then is sent to a precipitation tank for precipitation, supernatant liquid obtained by precipitation overflows into a desulphurization liquid tank and undergoes circular desulphurization after addition of alkali, and the precipitated calcium sulfite, calcium sulfate and calcium carbonate are removed regularly.

Dual alkali desulphurization energy-saving technique

Recycling system for heat and moisture in flue gas of coal-fired power plant and recycling method of recycling system

The invention relates to a boiler waste gas treatment device which comprises a heat exchanger, an absorption tower and a chimney. The heat exchanger is connected with the boiler, and waste gas discharged out of the boiler passes through the heat exchanger and then is introduced into the absorption tower. A spraying pipe is arranged in the absorption tower, the waste gas in gas is absorbed through spraying of the spraying pipe, and the absorption tower is connected with the chimney through a gas outlet pipeline. A draught fan A is arranged between the heat exchanger and the absorption tower. A draught fan B is arranged between the gas outlet pipeline and the chimney. The heat exchanger is a shell-and-tube heat exchanger. Compared with the prior art, the boiler waste gas treatment device is used for treating boiler waste gas and absorbing particles and harmful matter in the boiler waste gas, and the purposes of saving energy and protecting the environment are achieved.

Boiler waste gas treatment device

A process for desulfurizing fume by wet method includes such steps as the reaction of Na2CO3 solution as absorbent on SO2 in fume to become sodium sulfite solution, further absorbing SO2 to become sodium hydrogen sulfite, and the reaction of the used absorbent on lime milk to obtain sodium sulfite for cyclic using it.

Jiang Liqiao

Papers

Technique of wet method of flue gas desulfurization