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Magnesium-added limestone wet flue gas desulfurization method

A wet flue gas desulfurization and limestone technology, which is applied in the field of flue gas purification, can solve the problems of high price of magnesium oxide desulfurization raw materials, high power consumption, poor desulfurization performance of limestone, etc., and achieve excellent desulfurization performance, high desulfurization efficiency, The effect of increasing flexibility and adaptability

Inactive Publication Date: 2020-04-17
SUNIC ENERGY & ENVIRONMENT TECH CHONGQING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to solve the problems of poor limestone desulfurization performance, high power consumption and high price of magnesia desulfurization raw materials existing in the existing desulfurization technology, the present invention provides a wet flue gas desulfurization method with magnesia limestone

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  • Magnesium-added limestone wet flue gas desulfurization method
  • Magnesium-added limestone wet flue gas desulfurization method
  • Magnesium-added limestone wet flue gas desulfurization method

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Embodiment 1

[0071] A magnesium limestone wet flue gas desulfurization method, the magnesium limestone wet flue gas desulfurization method is desulfurization absorption, oxidation, separation and dehydration, slurry recovery four steps cycle desulfurization method, the specific steps are as follows:

[0072] S1, desulfurization absorption

[0073] The raw flue gas containing sulfur dioxide passes through the desulfurization absorption system from bottom to top, and the sulfur dioxide absorbent is sprayed from the top of the desulfurization absorption system to perform absorption reaction with the flue gas containing sulfur dioxide. The sulfur dioxide absorbent is magnesium limestone, and the absorption reaction is , keep the magnesium ion concentration at 2,000-20,000ppm, the pH value of the slurry is 4.5-7.0, the solid matter content in the desulfurization slurry is 10-22%, Cl - The concentration is 10,000~20,000ppm;

[0074] S2, oxidation

[0075] Discharging the desulfurized slurry in...

Embodiment 2

[0081] A magnesium limestone wet flue gas desulfurization method, the magnesium limestone wet flue gas desulfurization method is desulfurization absorption, oxidation, separation and dehydration, slurry recovery four steps cycle desulfurization method, the specific steps are as follows:

[0082] S1, desulfurization absorption

[0083] The flue gas containing sulfur dioxide passes through the desulfurization absorption system from bottom to top, and the sulfur dioxide absorbent is sprayed from the top of the desulfurization absorption system to perform absorption reaction with the flue gas containing sulfur dioxide. The sulfur dioxide absorbent is magnesium limestone. During the absorption reaction, Keep the concentration of magnesium ions at 4,000-10,000ppm, the pH value of the slurry is 5.5-6.5, the solid matter content in the desulfurization slurry is 15-18%, Cl - The concentration is 15,000~18,000ppm;

[0084] S2, oxidation

[0085] Discharging the desulfurized slurry in ...

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Abstract

In order to solve the problems of low efficiency, high energy consumption, high cost of magnesium oxide flue gas desulfurization raw materials, limitation of magnesium-added lime desulfurization raw materials, single performance and high energy consumption of existing limestone for washing sulfur dioxide in flue gas, the invention provides a magnesium-added limestone wet flue gas desulfurization method. The magnesium-added limestone wet flue gas desulfurization method comprises four steps of desulfurization absorption, oxidation, separation dehydration and slurry reuse so as to realize magnesium circulation desulfurization to generate a gypsum byproduct. The advantages of excellent desulfurization performance of magnesium (MgO) and low cost of limestone (CaCO3) are integrated, the consumption of magnesium oxide is only (2-5)% of the consumption of limestone, the desulfurization efficiency can reach 99.5+%, the desulfurization power consumption is reduced by half, and the high-qualitygypsum byproduct is produced, so that the method is an advanced energy-saving and emission-reducing technical process for realizing desulfurization ultralow emission, and is particularly suitable forsynergistic transformation of an existing limestone-gypsum process.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification treatment, and in particular relates to a method for adding magnesium limestone to wet flue gas desulfurization. Background technique [0002] In order to reduce the sulfur dioxide (SO2) in the combustion flue gas containing sulfur 2 ) emissions, to protect the atmospheric environment, using abundant limestone (calcium carbonate, CaCO 3 ) is the most widely used desulfurization process. More than 95% of China's thermal power plants adopt this process, and the design desulfurization efficiency is generally 95%. In order to meet stricter environmental protection requirements, LSFO devices have undergone several technical upgrades to further improve desulfurization efficiency. my country requires thermal power plants to achieve the goal of "ultra-low emissions" of flue gas, that is, the emission concentrations of soot, sulfur dioxide, and nitrogen oxides are not higher than 10, 35, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/73B01D53/96B01D53/80
CPCB01D53/501B01D53/73B01D53/96B01D2258/0283B01D2251/404B01D2251/606B01D2251/402B01D2251/604
Inventor 熊天渝
Owner SUNIC ENERGY & ENVIRONMENT TECH CHONGQING
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