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Energy-saving and efficiency-improving composite reagent for limestone gypsum desulfurization

A compound reagent and gypsum method technology, which is applied in the field of flue gas purification, can solve problems such as foaming problems that have not been considered, and achieve the effects of adjustable formula, improved utilization rate, and reduced moisture content of gypsum

Inactive Publication Date: 2014-12-10
CECEP L&T ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization synergist can increase the desulfurization efficiency by 5% to 15%, and can slow down the fouling of the demister, tower bottom and outlet flue of the desulfurization tower, but it does not consider synergism from the perspective of increasing the gas-liquid mass transfer rate, and also Does not take into account the problem of foaming

Method used

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  • Energy-saving and efficiency-improving composite reagent for limestone gypsum desulfurization

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0021] The energy-saving and efficiency-enhancing compound reagent is prepared according to the formula in Table 1:

[0022] Table 1 Compound Reagent Formula 1

[0023]

[0024] Simulated flue gas composition SO 2 : 0.4%, CO 2 : 11%, O 2 : 6%, N 2 : 82.6%, absorption temperature 55°C, liquid-gas ratio 10, calcium-sulfur ratio 1.01. The flue gas desulfurization efficiency is 73% when no energy-saving and efficiency-enhancing compound reagent is added, and the CaSO in the gypsum product 4 2H 2 The O content is 89.1%, and the water content is 12.5%. The energy-saving and efficiency-enhancing composite reagent is added at 700 mg / L, and the pH of the slurry is maintained at 5.2-6.0. At this time, the flue gas desulfurization efficiency is increased to 94%, and the CaSO 4 2H 2 The O content is 91.1%, and the water content is 9.9%.

specific Embodiment 2

[0025] The energy-saving and efficiency-enhancing compound reagent is prepared according to the formula in Table 2:

[0026] Table 2 Compound Reagent Formula 2

[0027]

[0028]

[0029] Simulated flue gas composition SO 2 : 0.5%, CO 2 : 12%, O 2 : 8%, N 2 : 79.5%. The absorption temperature is 55°C, the liquid-gas ratio is 12, the calcium-sulfur ratio is 1.01, and the flue gas desulfurization efficiency is 71% when no energy-saving and efficiency-enhancing compound reagent is added, and the CaSO in the gypsum product 4 2H 2 The O content is 89.3%, the water content is 12.3%, the energy-saving and efficiency-enhancing composite reagent is added at 800 mg / L, and the pH of the slurry is maintained at 5.2-6.0. At this time, the flue gas desulfurization efficiency increases to 91%, and the CaSO in the gypsum product 4 2H 2 The O content is 90.5%, and the water content is 10.1%.

specific Embodiment 3

[0030] The energy-saving and efficiency-enhancing compound reagent is prepared according to the formula in Table 3:

[0031] Table 3 Compound Reagent Formula 3

[0032]

[0033] Simulated flue gas composition SO 2 : 0.3%, CO 2 : 12%, O 2 : 7%, N 2 : 80.7%. The absorption temperature is 55°C, the liquid-gas ratio is 10, the calcium-sulfur ratio is 1.01, and the flue gas desulfurization efficiency is 84% ​​when no energy-saving and efficiency-enhancing compound reagent is added, and the CaSO in the gypsum product 4 2H 2 The O content is 89.0%, and the water content is 12.2%. The energy-saving and efficiency-enhancing composite reagent is added at 800mg / L, and the pH of the slurry is maintained at 5.2-6.0. At this time, the flue gas desulfurization efficiency increases to 97%, and the CaSO 4 2H 2 The O content is 90.9%, and the water content is 9.8%.

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Abstract

The invention discloses an energy-saving and efficiency-improving composite reagent for limestone gypsum desulfurization. The composite reagent is characterized in that the composite reagent is powdered solid formed by mixing 10-70% (wt%) of cosolvent, 1-40% (wt%) of pro-oxidant, 10-35% (wt%) of absorbent and 1-15% (wt%) of regulator at a room temperature. The addition amount of the energy-saving and efficiency-improving composite reagent is 300-1300mg / L. The composite reagent is simple to prepare and flexible in formula, and the corresponding energy-saving and efficiency-improving composite reagent can be prepared under different operating conditions. The energy-saving and efficiency-improving composite reagent for the limestone gypsum desulfurization has the characteristics of high efficiency-improving speed, wide efficiency-improving range, no secondary pollution and low cost, and has scale inhibition, defoaming and corrosion inhibition performances. The composite reagent can be used in a limestone gypsum desulfurization system in the fields of power, refining and chemical, metallurgy and the like, can reduce the energy consumption, and can obtain high desulfurization efficiency.

Description

technical field [0001] The invention belongs to the field of flue gas purification, and in particular relates to an energy-saving and efficiency-enhancing composite reagent for limestone gypsum desulfurization. Background technique [0002] Limestone gypsum flue gas desulfurization technology is mature and stable, and it is the most widely used flue gas desulfurization technology. With the use of high-sulfur coal and SO 2 Emission standards are becoming increasingly stringent, the original desulfurization equipment is difficult to meet the standard, and the cost of desulfurization transformation is high and the effect is slow. Therefore, the development of energy-saving and efficiency-enhancing reagents for limestone gypsum desulfurization can bring significant environmental and economic benefits. [0003] Patent (CN102091510A) discloses a flue gas desulfurization synergist, the weight percent (%) of its components is: dibasic acid 30% to 80%, inorganic salt 5% to -30%, we...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50
Inventor 董丽彦周欣刘辰刘玉朋张会来宋宝华唐丽邢瑞
Owner CECEP L&T ENVIRONMENTAL TECH
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