Low-cost two-section-process low-temperature denitration method
A low-temperature denitration and two-stage technology, which is applied in the low-cost two-stage low-temperature denitration field, can solve the problems of high cost and complex catalyst production process, and achieve the effects of strengthening the removal rate, no waste water discharge, and reducing costs.
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Embodiment 1
[0031] This embodiment provides a low-cost two-stage low-temperature denitrification method, such as figure 1 shown, including the following steps:
[0032] S1. One-stage denitrification: pass the flue gas into reagent A to perform one-stage denitrification reaction; the reagent A includes 20-100g / L cobalt salt compound, 10-50g / L benzyl-containing compound, 20-200g / L amines and 1-100g / L urea, sodium hydroxide or potassium hydroxide to adjust the pH to 10-14;
[0033] After a period of denitrification, the efficient removal of nitrogen oxides in low-temperature flue gas (5-280°C flue gas) can be achieved, and the removal rate of nitrogen oxides is 80-85%;
[0034] S2. Two-stage denitrification: pass the first-stage denitrification tail gas obtained through step S1 into reagent B for second-stage denitrification; the reagent B includes 1-100g / L oxidant, 1-20g / L chlorate, 5-50g / L L amines, 1-25g / L carboxymethylcellulose, 5-100g / L litmus, 1-100g / L urea, sodium hydroxide or potas...
Embodiment 2
[0049] This embodiment provides a device for implementing the method described in Embodiment 1, such as figure 2 As shown, it includes reagent A feeding device 1, rotary reactor 2, multi-stage spraying device 3, reagent B feeding device 4, reagent A recovery device 5, reagent B recovery device 6, reagent A regeneration device 7, reagent B regeneration device 8;
[0050] The rotary reactor 2 includes a casing 21, a rotor 22, a filler 23 and a liquid distributor 24; the rotor 22 and the liquid distributor 24 are arranged inside the casing 21, and the filler 23 is filled in the rotor 22 The inside of the said liquid distributor 24 is arranged laterally inside the said rotor 22, and its reagent A inlet extends from the rotor 22 to the outside of the said shell 21, and said rotor 22 communicates with the inside of said shell 21; said shell The top and the bottom of 21 are provided with flue gas inlet and reagent A outlet respectively, and described housing 21 is also provided wit...
Embodiment 3
[0053] This embodiment provides a low-cost two-stage low-temperature denitrification method, including the following steps:
[0054] 1) Denitrification reaction
[0055] Kiln flue gas after dedusting and desulfurization (30°C, NO x The concentration is 800-1200mg / Nm 3 ), enters the rotary reactor with a total flow rate of 600L / s (flow rate is 3.6m / s), reagent A enters from the reagent A inlet of the rotary reactor, and realizes mass transfer enhancement between reagent A and flue gas based on high gravity technology, To achieve high-efficiency denitrification effect. Reagent A includes 40g / L cobalt chloride, 20g / L octadecyldimethylbenzyl ammonium chloride, 60g / L carbonamide and 10g / L urea, and the pH of the solution is 13. After a stage of denitrification, the tail gas of a stage of denitrification enters the multi-stage spraying device and reacts with reagent B to realize deep denitrification. Reagent B includes 30g / L ferric chloride, 1g / L sodium chlorate, 20g / L ethylened...
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