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High-efficiency coal-fired flue gas desulfurization and mercury removal method and device

A coal-fired flue gas and flue gas technology, 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, large The effect of specific surface area

Inactive Publication Date: 2016-04-20
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 high, and the removal effect on zero-valent mercury vapor is poor, and industrial application has not yet been realized.

Method used

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  • High-efficiency coal-fired flue gas desulfurization and mercury removal method and device
  • High-efficiency coal-fired flue gas desulfurization and mercury removal method and device
  • High-efficiency coal-fired flue gas desulfurization and mercury removal method and device

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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] For an 85t / h coal-fired boiler, the sulfur content of the coal fired is 0.5%, and the mercury content of the coal fired 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, in 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 flu...

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Abstract

A new method and device for flue gas desulfurization and mercury removal, in which lime and fly ash are activated by low-pressure steam in a boiler to enhance the effect of desulfurization and mercury removal. Firstly, the lime or Ca(OH)2 used as the desulfurization and mercury removal absorbent is activated and mixed with the flue gas by medium and low pressure water vapor, and at the same time, part of the fly ash is circulated to the top of the reaction tower to be mixed with the flue gas by medium and low pressure water vapor; Spray water mist into the reaction tower at the lower part of the flue gas distributor, the lower flue gas temperature is conducive to improving the reactivity of SO2 and Ca(OH)2, the humidity of the flue gas is conducive to improving the utilization rate of the absorbent, and improving the desulfurization and demercuration agent. Absorption properties of mercury vapor. The flue gas enters the bag type or electric bag composite dust collector after desulfurization and mercury removal in the reaction tower, and part of the collected fly ash is transported to the reaction tower for recycling to further improve the utilization rate of the absorbent; the purified flue gas is sent into the dust collector through the induced draft fan Chimney exhaust. The operating cost of the device is low, and it can achieve high desulfurization and mercury removal effects when used in conjunction with bag filter or electric bag composite dust removal equipment.

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 highest 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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Patent Type & Authority Patents(China)
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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