Method for desulfurizing high-sulphur boiler flue gas to prepare high-purity ammonium bisulfite

An ammonium bisulfite and boiler flue gas technology, applied in ammonium sulfite, separation methods, chemical instruments and methods, etc., can solve the problems of large dehydration resistance, low absorption efficiency, large ammonia escape loss, etc. The effect of desulfurization efficiency, high desulfurization efficiency and low investment cost

Active Publication Date: 2012-10-31
JIANGSHAN TAIGE CHEM
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AI Technical Summary

Problems solved by technology

[0011] Smelting and Sintering Gas Desulfurization and Recovery of SO 2 Acid production is to remove dust and purify the sintering flue gas by going through two stages of power wave washing, one stage of empty tower cooling, one stage of power wave washing, and two stages of electrostatic demisting, but there are complex processes and high investment costs. , High power consumption and other disadvantages
[0012] The previous ammonia desulfurization absorption towers used empty towers, bubble towers, and grid towers, which had disadvantages such as low absorption efficiency, large liquid-gas ratio, high ammonium salt oxidation rate, or large resistance.
[0013] The previous ammonia desulfurization tail gas did not wash the ammonia recovery section. Generally, a dehydration and demisting device with two baffles was used. The water in the tail gas was serious, the dehydration resistance was large, the dehydration and demisting efficiency was low, and the loss of ammonia escape was large. Affect the environment, the investment cost of wet electrostatic precipitator is very high, and the operation cost is high

Method used

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  • Method for desulfurizing high-sulphur boiler flue gas to prepare high-purity ammonium bisulfite

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Experimental program
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Effect test

Embodiment 1

[0038] High-sulfur boiler flue gas desulfurization method for preparing high-purity ammonium bisulfite, such as figure 1 As shown, the method is as follows:

[0039] After high-sulfur coal-fired or oil-fired boiler flue gas is dried by electrostatic precipitator or bag filter, it is sent to wet scrubber 2 such as venturi or power wave by induced draft fan via pipeline 1 for dust removal and cooling, and the scrubber comes out The gas-liquid mixture enters the gas-liquid separation tower 4 through the line 3, the lower liquid is sent back to the scrubber 2 by the scrubber circulating pump 5 through the line 6, and the external tap water is added to the lower part of the tower from the line 7 as makeup water for washing, and the upper flue gas After the double-layer folded demister 8 removes the entrained liquid droplets, it is sent to the desulfurization tower 100 through the pipeline 11, and the flushing water of the demister 8 is sent from the pipeline 9 to the demister for regul...

Embodiment 2

[0046] SO in flue gas of high-sulfur coal-fired boiler 2 Content 25000 mg / Nm 3 , Temperature 170℃, flow rate 80,000Nm 3 / h, the flue gas is sent to the Venturi scrubber by the induced draft fan and the booster fan after the four-stage electrostatic precipitator, and the circulating fluid sent by the washing circulation pump is 200m 3 / h wet scrubbing, liquid-gas ratio 2.5, gas-water mixture enters the gas-liquid separation tower, the temperature drops to 55℃, the flue gas enters the lower part of the first-stage desulfurization tower after the mist is removed by the two-stage folded plate demister with flushing. Part of the still liquid in the gas-liquid separation tower (200m 3 / h) It is used to pump the venturi washing cycle through the washing cycle, part of it (100m 3 / h) Send the inclined plate inclined tube settler to separate, the clear liquid at the upper part of the settler is returned to the gas-liquid separation tower for recycling, and the acid water containing dust an...

Embodiment 3

[0048] SO in flue gas of coal-fired boiler 2 Content 15000 mg / Nm 3 , Flow 240000Nm 3 / h, washing circulating fluid flow rate 600m 3 / h, liquid-gas ratio 2.5, part of the liquid in the gas-liquid separation tower (600m 3 / h) It is used to pump the venturi washing cycle through the washing cycle, part of it (300m 3 / h) Send the inclined plate inclined tube settler to separate, and the acid water containing dust and mud at the bottom has a flow rate of 9m 3 / h to send sewage treatment, first-stage ammonia water 0.60m 3 / h and the absorption liquid from secondary absorption 5.90m 3 / h, the first stage of absorption is high SO 2 / NH 3 的ammonium bisulfite solution, SO 2 / NH 3 Is 0.92, the total sulfite concentration is 575g / L, the ammonium sulfate produced by the oxidation of ammonium sulfite is 42 / g / L, the still liquid of the first-stage desulfurization tower is pumped out by the first-stage circulating pump, and most of the (1200 m 3 / h) as the circulating fluid, the rest (6.2m 3 / h) U...

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Abstract

The invention relates to a method for removing and recycling SO2 in high-sulphur boiler flue gas and discloses a method utilizing ammonia water as material and recycling desulfuration to prepare ammonium bisulfite with high SO2/NH3 value and high purity. The method comprises the steps of (1) performing dry dedusting on high-sulphur boiler flue gas, and cooling through wet dust collection, (2) utilizing ammonia water as absorbents to absorb SO2 in flue gas in a triple tandem desulfurizing absorption tower, controlling the absorbing temperature through an exterior circulation cooling mode, preparing ammonium bisulfite solution with high SO2/NH3 value, and discharging with standard level after water scrubbing and demisting, (3) removing high chemical valence insoluble heavy metal ions such as ferric iron through microfiltration, and (4) removing heavy metal ions through chelating ion exchange resins to obtain products. According to the method, the concentration of SO2 in flue gas after desulfurization is low, SO2 in high-sulphur boiler flue gas is effectively recycled, and ammonium bisulfite solution with high SO2/NH3 value and high purity is prepared.

Description

technical field [0001] The present invention relates to a method for removing and recovering SO2 in flue gas from a high-sulfur boiler, in particular to a method for preparing high-SO2 by using ammonia water as raw material for desulfurization and recovery. 2 / NH 3 value, high-purity ammonium bisulfite method. Background technique [0002] SO in the flue gas of high-sulfur coal, fuel oil and fuel gas boilers 2 Governance is a difficult problem in desulfurization. Although the traditional limestone method, double alkali method and other desulfurization processes can meet the discharge standards, they have the disadvantages of large consumption of alkali absorbents and high operating costs. The traditional ammonia method has many by-products recovered with impurities and poor quality. Disadvantages of added value of ammonium sulfate. Based on the concept of circular economy, the SO in the high-sulfur boiler flue gas 2 Starting from resource utilization and high value-add...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D50/00C01C1/22
Inventor 王继森周万荣涂军占继善
Owner JIANGSHAN TAIGE CHEM
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