A method for deep removal of SO2 co-production gypsum whiskers in flue gas by calcium-magnesium fusion method

A technology of gypsum whiskers and flue gas, which is applied in the field of deep removal of SO2 in flue gas and co-production of gypsum whiskers by calcium-magnesium fusion method, can solve the problems affecting the quality, usage and sales price of gypsum whiskers, and achieve The effect of improving the quality of follow-up products, improving desulfurization efficiency, and expanding applications

Active Publication Date: 2018-12-04
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the absence of impurity separation measures, all the chemical impurities in the limestone are transferred to the gypsum whisker product, which seriously affects the quality, use and sales price of the gypsum whisker product

Method used

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  • A method for deep removal of SO2 co-production gypsum whiskers in flue gas by calcium-magnesium fusion method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Desulfurization tower packing height 2000mm, Mg(OH) 2 The slurry concentration is 2%, the operating temperature is 50°C, and the 2 1.2% simulated mixed gas 100L / min, liquid-gas ratio (L / G) = 1.5, measuring tower outlet SO 2 The concentration is 138PPM, and the desulfurization efficiency is 98.85%. Gradually add magnesium hydroxide to 10L slurry to keep Mg(OH) 2 The slurry concentration is about 1-2%, add Mg(OH) at 15h 2 1200g, measuring tower outlet SO 2 The concentration is 152PPM, and the desulfurization efficiency is 98.73%. Take the desulfurization mother liquor, pass through the air to oxidize and filter to get MgSO 4 Solution, measured concentration 1.62mol / L. MgSO 4 Solution 1L and 2.0mol / L calcium nitrate Ca(NO 3 ) 2 810mL of aqueous solution was heated to 98°C, added together into a 5000ml reactor, kept for 30 minutes, then filtered, washed, and dried at 105°C to obtain 216g of hemihydrate gypsum whiskers. The measured whisker whiteness is 96%, and th...

Embodiment 2

[0035] The flue gas flow into the desulfurization tower is 12000NM 3 / h,SO 2 1.03%, the temperature is 150°C, it is passed into the middle of the desulfurization tower, and it is in countercurrent contact with the circulating liquid sprayed from the upper part, the concentration of magnesium sulfate in the circulating liquid is 1.2mol / L, Mg(OH) 2 Slurry concentration 1-2%, operating temperature 50°C, liquid-gas ratio (L / G) = 1.5, measuring tower outlet SO 2 The concentration is 118PPM, and the desulfurization efficiency is 98.85%.

[0036] Take 10L of the desulfurization mother liquor after air oxidation, filter it, and dry the filter residue to obtain an off-white powder; the filtrate is measured for MgSO 4 The concentration is 1.22mol / L. Take calcium nitrate Ca(NO) adjusted to 2.0mol / L 3 ) 2 6.1L of aqueous solution was heated to 100°C, added together into a 20L reactor, kept warm and stirred for 30 minutes, filtered, washed, and dried at 105°C to obtain 1645g of hemihy...

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Abstract

The invention discloses a method for deep removal of SO2 from flue gas by calcium-magnesium fusion technique and co-production of gypsum whisker. The method includes: using magnesium hydroxide as an absorbent for cyclic absorption removal of SO2 from flue gas; introducing air from the bottom of a desulfurization tower to oxidize desulfurization product magnesium sulfite into magnesium sulfate; filtering a magnesium sulfate solution, then reacting the filtrate with calcium nitrate generated by a subsequent magnesium hydroxide regeneration process to produce gypsum whisker, carrying out filtering, washing and drying to obtain a semi-hydrated gypsum whisker product; taking a magnesium nitrate solution as the whisker mother solution, adding lime into the magnesium nitrate solution to carry out magnesium precipitation reaction, and performing filtering to obtain a magnesium hydroxide filter cake and a calcium nitrate solution; washing the magnesium hydroxide filter cake, then returning the washed magnesium hydroxide filter cake to the desulfurization tower for cyclic removal of SO2 from flue gas, and returning the calcium nitrate solution to a gypsum whisker process. The method fuses calcium method and magnesium method desulfurization, makes the two complement each other's advantages, can reach a flue gas SO2 removal efficiency up to more than 98%, ensures the by-product gypsum whisker the high quality of a whiteness of more than or equal to 96% and chemical composition of more than or equal to 99%, thus saving natural resources and energy from the source.

Description

technical field [0001] The present invention relates to coal, petroleum, natural gas fossil fuel burning in the flue gas produced after fixed burner needs to remove sulfur dioxide SO therein 2 industry and technical field, specifically involving a calcium-magnesium fusion method for deep removal of SO in flue gas 2 A method of co-producing gypsum whiskers. Background technique [0002] After fossil fuels such as coal, oil, and natural gas are burned at high temperatures, the flue gas contains sulfur dioxide SO 2 Acidic substances have caused enormous damage to the atmosphere and human living environment for many years. [0003] The lime / gypsum method (calcium method) widely used in domestic large-scale power plants uses limestone / lime as a desulfurizer to remove sulfur dioxide SO in flue gas 2 The removal rate reaches 90-95%, and the product is desulfurized gypsum. Because there are many chemical impurities in limestone mines in various places, these impurities are all tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/73B01D53/50B01D53/96C30B29/62C30B29/46C30B7/14
CPCB01D53/502B01D53/73B01D53/96B01D2251/402B01D2251/604B01D2258/0283C30B7/14C30B29/46C30B29/62
Inventor 陈学玺陈春光杜蕾何欣
Owner QINGDAO UNIV OF SCI & TECH
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