Corrosion Control and Selenium Removal in Flue Gas Wet Scrubber Systems
A wet scrubber, flue gas technology, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of high operating costs, high waste water treatment costs, high water consumption, etc.
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Embodiment 1
[0100] A sample of scrubber water treated through a vacuum filter. The goal is to remove mercury. Mercury removal from samples was studied using an experimental design with two variables pH and dose.
[0101] The results indicated that mercury levels of less than 0.5 ppb in treated water were achieved at various pH values with reasonable product dosage. This work shows that the product does indeed achieve mercury capture from wet FGD fluids. The lower detection limit of this analytical method is 0.5 ppb.
[0102] The result is as follows:
[0103]
[0104]
[0105] a DTCP is a polydithiocarbamate compound of the present invention
[0106] b The flocculant is commercially available from the Nalco Company and is a very high molecular weight 30 mole percent anionic latex polymer.
Embodiment 2
[0108] By dissolving 6.7 mg of sodium selenite Na 2 SeO 3 ·5H 2 O, 14 ml of 0.141MHg (NO 3 ) 2and 18.4 g of calcium chloride CaCl 2 2H 2 O to make a 2L solution. The resulting solution had measured concentrations of 0.037 mM selenium, 1.04 μM mercury and 63 mM calcium chloride dehydrate.
[0109] The results are shown in the table below.
[0110] deal with
[0111] Zeolites are spent commercial catalysts. Fly ash samples were obtained from coal-fired power plants. The fly ash sample consisted of 93% ash with 6% residual carbon and 1% residual sulfur. These results clearly show that neither fly ash nor zeolites significantly reduce ionic mercury levels.
Embodiment 3
[0113] By dissolving 12.58 g of calcium chloride dihydrate, CaCl, in 400 mL of deionized water 2 2H 2 O to prepare synthetic FGD scrubber fluid. The resulting solution was 214 mM calcium chloride dihydrate, resulting in 15,000 ppm chloride and 8560 ppm calcium in solution. Divide the solution into two equal parts. To 200 mL of the solution was added 164 μL of 0.61 mM mercury nitrate solution to obtain a solution containing 130 μg / L of ionic mercury. This solution was treated with 27.4 g of calcium sulfate dihydrate or 18% by weight. Mix the solution and divide it into two parts. A smaller portion of a total of 75 g was treated with a polydithiocarbamate compound at a 5:1 product to mercury weight ratio. Polydithiocarbamate products are 30% active water-miscible solutions. The two fractions were stirred separately for 12 hours using a magnetic stir bar. After this time, the suspension was filtered using a Pall Life Sciences GN-6 Metricel 0.45μ membrane filter (P / N63069)....
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