Coal flue gas mercury adsorbing removal process capable of recovering adsorbent and device utilizing same

A technology of coal-burning flue gas and adsorbent, which is applied in the field of flue gas purification, can solve the problems that activated carbon cannot be recycled and reused, the quality of finished bricks or cement is reduced, and the amount of adsorbent is increased, and achieves significant selective adsorption of mercury. Effect of improving stability and improving adsorption capacity

Inactive Publication Date: 2012-06-13
GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that activated carbon not only adsorbs mercury, but also adsorbs smoke and dust, which increases the amount of adsorbent; activated carbon mixed into fly ash cannot be recycled and reused, which not only increases the cost of mercury removal, but also comprehensively utilizes the subsequent fly

Method used

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  • Coal flue gas mercury adsorbing removal process capable of recovering adsorbent and device utilizing same
  • Coal flue gas mercury adsorbing removal process capable of recovering adsorbent and device utilizing same
  • Coal flue gas mercury adsorbing removal process capable of recovering adsorbent and device utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Working process of active carbon adsorption and demercuration and desorption recovery system

[0022] figure 1 It is a flue gas purification treatment system process including selective catalytic reduction denitrification (SCR denitrification), dust removal, adsorption demercuration and desulfurization. The working process of the adsorption demercuration system is as follows:

[0023] Open the air compressor 19, the compressed air enters the air storage tank 17 after removing oil, water and dust through the degreasing water device 18, the compressed air system throws automatically, and the gas storage is standby. Turn on the fluidizing air system, so that the air flow is blown upward from the fluidizing air inlet 20 at the bottom of the adsorbent storage bin 1, and at the same time open the bag filter 2 on the top of the warehouse; the fluidizing wind can make the activated carbon near the feeding port fluidized (ie suspended ) state, to prevent the activated...

Embodiment 2

[0026] Example 2 Experiments on mercury removal efficiency of flue gas adsorbents with different dust contents

[0027] In this test, the injection position of activated carbon includes two schemes: after the boiler flue gas dust collector and before the dust collector, and the scheme of spraying after the dust collector includes three dust removal situations with the electric field numbers of 4, 3 and 1 respectively. , that is, the soot concentration of the outlet flue gas increases with the reduction of the number of electric fields used by the dust collector; the spraying scheme before the dust collector includes high dust (21270mg / Nm 3 ) and low dust (12370Nm 3 ) two concentrations, the comparison of activated carbon mercury removal efficiency under different conditions is shown in Table 1,

[0028] Table 1

[0029]

[0030]

[0031] As can be seen from Table 1, the mercury removal efficiency of the adsorbent has a great relationship with the soot concentration in ...

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Abstract

The invention relates to a coal flue gas mercury adsorbing removal process capable of recovering adsorbent and a device utilizing the same. The coal flue gas mercury adsorbing removal process includes steps of firstly, delivering powdered activated carbon which serves as adsorbent into a flue gas pipeline between a flue gas dust collector and an inlet of a desulfurizing tower, and spraying the powdered activated carbon by a spray gun so that the powered activated carbon is dispersed in flue gas sufficiently and capable of adsorbing mercury in the flue gas; secondarily, filling the flue gas mixed with the activated carbon into a cloth bag type filter so as to realize gas and solid separation; and thirdly, delivering and recovering the activated carbon after the activated carbon is regenerated. When gas and solid separation is realized in the second step, flue gas without mercury enters the next desulfurizing process through the cloth bag type filter, the activated carbon retained by the cloth bag type filter is captured, desorbed and regenerated at the temperature ranging from 130 DEG C to 800 DEG C under protection of nitrogen gas, and mercury gas is released and then sent to a recovery system. The coal flue gas mercury adsorbing removal process capable of recovering the adsorbent and the device utilizing the same have the advantages that mercury removal efficiency is high, usage of the adsorbent is low, and the adsorbent can be recovered so that cost is reduced; further, since the adsorbent is separated from fly ash, the subsequent use value of fly ash is ensured, while recovery of mercury source is realized.

Description

technical field [0001] The invention relates to a coal-burning flue gas adsorption and demercuration method and a device thereof, in particular to a coal-fired flue gas adsorption and mercury removal method and a device with recyclable adsorbents, belonging to the field of flue gas purification. Background technique [0002] Boiler flue gas contains a variety of harmful substances, in addition to high content of smoke, SO 2 In addition to , NOx, mercury in coal is emitted into the atmosphere through flue gas during coal combustion, and the harm to the environment and human health cannot be ignored. 2 After , NOx, it is necessary to strictly control the discharged pollutants. The United States and the European Union have formulated and clarified specific requirements and timetables for limiting mercury emissions from coal-fired power plants. The United Nations Environmental Protection Agency plans to form a global binding mercury control law in 2013. With the increasingly s...

Claims

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Application Information

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IPC IPC(8): B01D53/10
Inventor 许月阳薛建明管一明王小明王宏亮王铮
Owner GUODIAN ENVIRONMENTAL PROTECTION RES INST CO LTD
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