Efficient coal-fired flue gas sulfur removal and mercury removal method and device

A coal-fired flue gas and mercury removal technology, which is applied in the field of environmental pollution control, can solve the problems of poor removal effect of zero-valent mercury vapor, unrealized industrial application, complicated regeneration process, etc., and achieve rich porosity, good absorption effect, and improved The effect of specific surface area

Inactive Publication Date: 2013-08-14
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the regeneration process of the absorption liquid in this process is complicated, the operating cost is hig

Method used

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  • Efficient coal-fired flue gas sulfur removal and mercury removal method and device
  • Efficient coal-fired flue gas sulfur removal and mercury removal method and device
  • Efficient coal-fired flue gas sulfur removal and mercury removal method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The desulfurization and mercury removal device experiment was carried out in a 2t / h coal-fired experimental boiler. The experimental system is as follows image 3 As shown, the size of the flue gas desulfurization and mercury removal reaction tower is Ф1200mm×7800mm, the flue gas superficial flow velocity is 3.8m / s, and the rear of the desulfurization and mercury removal reaction tower is equipped with a bag filter to collect the by-products after the reaction. The raw coal of Datong, Shanxi Province was used for experimental research, the sulfur content of the coal was 0.32%, and the mercury content in the coal was 0.35mg / kg.

[0045] The temperature of the flue gas entering the reaction tower device is 128°C, SO 2 The concentration is 578mg / Nm 3 , the concentration of mercury vapor is 21.6μg / Nm 3 . By spraying water into the reaction tower and keeping the tower temperature at 75°C, the concentration of particulate matter in the reaction tower after desulfurization ...

Embodiment 2

[0047] An 85t / h coal-fired boiler, the sulfur content of coal combustion is 0.5%, and the mercury content of coal combustion is 0.11mg / kg. The flue gas temperature at the outlet is 139.9°C, and the flue gas volume is 234000-236000Nm 3 / h, flue gas SO 2 The concentration is 920mg / Nm 3 . Adopt the dry flue gas desulfurization and mercury removal device of the application of the present invention, such as image 3 As shown, the physical and chemical properties of fly ash changed significantly after water vapor transport, and a part of CaO was transformed into porous Ca(OH) 2 , improve the adsorption capacity of fly ash to mercury. The temperature of the flue gas after desulfurization and dust removal is 76-79°C, and the CaO / SO 2 When the molar ratio is lower than 1.2, SO in the treated flue gas 2 The concentration is 89mg / Nm 3 , The desulfurization efficiency reaches 89.3%. Using this device combined with the bag filter can remove about 98.6% of the mercury vapor in the fl...

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Abstract

The invention discloses an efficient coal-fired flue gas sulfur removal and mercury removal method and device, wherein lime and fly ash are activated by low-pressure water vapor in a boiler so as to enhance the sulfur removal and mercury removal effect. The method comprises the following steps of; firstly, activating lime or Ca(OH)2 used as a sulfur removal and mercury removal absorbent by using medium- and low-pressure water vapor, mixing with flue gas, and simultaneously, circularly conveying a part of fly ash to the top of a reaction tower to be mixed with the flue gas by using the medium- and low-pressure water vapor; spraying water mist into the reaction tower at the lower part of a flue gas distributor, wherein reduction of the flue gas temperature facilitates improvement of the reaction activity of SO2 and Ca(OH)2, and the flue gas humidity is beneficial for improving the utilization rate of the absorbent and improving the absorption performance of the sulfur removal and mercury removal agent to the mercury vapor; entering the flue gas to a bag type or electric bag compound dust remover after sulfur removal and mercury removal in the reaction tower, and conveying a part of collected fly ash to the reaction tower for cycle use so as to further improve the utilization rate of the absorbent; and conveying the purified glue gas to a chimney by a draught fan so as to be discharged. The device is lower in operating cost, and can reach higher sulfur removal and mercury removal effect in cooperation with the bag type dust remover or the electric bag compound dust remover.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution control, and in particular relates to a method and a device for desulfurizing and demercurizing coal-fired flue gas. Background technique [0002] my country is the SO in the world 2 and countries with the largest mercury emissions, 75% of which are SO 2 and 65% of mercury is produced by coal-burning emissions. The pollution situation caused by coal-burning is very serious. In addition to coal-burning SO 2 In addition to focusing on the control of particulate matter pollution, the prevention and control of mercury-based heavy metal pollution is also of great concern. At present, most of the control of different pollutants at home and abroad adopts a single technology. For example, the flue gas mercury removal technology developed by the US Energy Technology Laboratory (NETL) uses activated carbon injection and dust removal technology to remove mercury as high as 90%, but the inve...

Claims

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Application Information

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IPC IPC(8): B01D53/83B01D53/50B01D53/64
CPCB01D53/83B01D53/50B01D53/64B01D2251/404B01D2257/602B01D2258/0283F23J2215/20F23J2215/60F23J2217/101F23J2217/102F23J2219/40B01D53/10B01D53/502B01D2253/10B01D2257/302F23J15/04
Inventor 王凡刘宇张凡田刚王红梅
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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