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Waste gas control method by removing sulfur dioxide for resource utilization

A sulfur dioxide and exhaust gas treatment technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of limited sources, secondary pollution, high cost of desulfurization raw materials, etc. The effect of low cost

Inactive Publication Date: 2008-01-09
SICHUAN UNIV
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Problems solved by technology

[0004] In summary, the method of wet desulfurization and recovery of sulfur resources from sulfur dioxide-containing waste gas ultimately boils down to the treatment of sulfur-containing wastewater. The common problems of the available sulfur-containing compound methods are: first, the cost of raw materials for desulfurization is high or the source is limited, such as the consumption of ammonia water in the ammonia desulfurization method, and the consumption of sodium carbonate or sodium hydroxide in the sodium-alkali method , the consumption of magnesia in the magnesium oxide method, the source of phosphate rock in the ammonium phosphate fertilizer method, the source of pyrolusite in the pyrolusite method, and the limestone ore source in the gypsum method; the second is that there are secondary pollution problems to varying degrees

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  • Waste gas control method by removing sulfur dioxide for resource utilization

Examples

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Embodiment 1

[0028] The garbage leachate of the urban garbage landfill is used as the absorption liquid, and the waste gas of the coal-fired boiler is treated by the method of the present invention, and the sulfur resource is recovered from the waste gas, and at the same time, the harmless treatment of the garbage leachate of the urban garbage landfill is realized, and the use of waste is realized. The purpose of treating waste and recycling sulfur resources. Taking the treatment of a coal-fired boiler with a scale of 35T / h as an example, the amount of waste gas to be treated is 60000Nm 3 / h, the content of sulfur dioxide in the exhaust gas is 1500ppm, the pH value of the leachate of the urban waste landfill as the exhaust gas desulfurization absorbent is 8.5, the concentration of ammonia nitrogen is 2000mg / L, the CODcr is 8600mg / L, and the ferrous ion (Fe 2+ ) concentration is 18mg / L, manganese ion (Mn 2+ ) concentration is 12mg / L, and the effective alkalinity is 1200mg / L (based on Na 2...

Embodiment 2

[0031] Sodium carbonate is used as the absorbing liquid, the method of the invention is used to control the sintering waste gas of the crude lead smelter, and recover sulfur resource from the waste gas. The amount of sintering waste gas to be treated is 60000Nm 3 / h, the exhaust gas temperature is 180°C, the sulfur dioxide content in the exhaust gas is 1500ppm, and the concentration is 5% sodium carbonate (Na 2 CO 3 ) lye is the absorbing liquid.

[0032] The process flow of this embodiment is shown in Figure 2. 5% sodium carbonate (Na 2 CO 3 ) alkaline water pump 2 into the waste gas absorption device through the water inlet 4 on the top of the waste gas absorption device 3, and simultaneously the sintering waste gas enters the waste gas absorption device 3 from the waste gas inlet 5 at the bottom of the waste gas absorption device, and the sulfur dioxide (SO 2 ) absorbed into sodium carbonate (Na 2 CO 3 ) lye and the alkaline substance sodium carbonate (Na 2 CO 3 ) ...

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Abstract

The invention provides a method for desulfurization of SO2 waste gas. A basic absorption liquid neutralizes the SO2- laden waste gas to eliminate SO2, discharge the purified gas when the content of SO2 reaches the standard; microbe reduces the desulfurizing absorption tail liquid (containing sulfite group, bisulphate group, or sulfuric group), then microbe oxygenizes the liquid, and the SO2 contained is recovered as a existent of elemental sulfur. The liquid treated by microbe is basic, and it can return directly to the desulfurizing absorption unit and be reused as a basic absorption liquid. And it realizes the aim of eliminating waste and recycling sulfur resource. The method for waste gas treatment is easy to operate and leads to none secondary pollution.

Description

1. Technical field [0001] The invention relates to a waste gas treatment method, more specifically, relates to a waste gas treatment method for removing sulfur dioxide in waste gas by liquid absorption, and belongs to the technical field of environmental protection. 2. Background technology [0002] Sulfur dioxide emitted by fossil fuel combustion is one of the main causes of acid rain. Acid rain leads to acidification of soil and water systems, endangering forests and crops, and causing disastrous consequences to the human ecological environment. In 2000, China's sulfur dioxide emissions were as high as nearly 20 million tons. Since 2003, the situation in areas heavily polluted by acid rain has been particularly severe. Therefore, it is urgent to take effective measures to reduce emissions or control sulfur dioxide. The control of sulfur dioxide pollution can be divided into three ways, that is, desulfurization before combustion, desulfurization during combustion and exhau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50
Inventor 丁桑岚苏仕军
Owner SICHUAN UNIV
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