HWAHAK KONGHAK Vol. 41, No. 3, June, 2003, pp. 403-409
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Simultaneous Removal of SO2 and NOx by the Absorbent from Coal Fly Ash
Jong-Hyeon Jung†, Byung-Hyun Shon*, Kyung-Seun Yoo**, Hyun-Gyu Kim *** and Hyung-Kun Lee****
Division of Biotechnology & Health Engineering, Sorabol College, Gyeongju 780-711, Korea*Department of Environmental Engineering, Hanseo University, Seosan 356-706, Korea
**Department of Environmental Engineering, Kawngwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul 139-701, Korea***Department of Environmental Science & Engineering, Pohang University of Science & Technology,
San 31 Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, Korea****Department of Clean Energy Research, Korea Institute Energy Research, 71-2 Jang-dong, Yuseong-gu, Daejeon 305-343, Korea
(Received 28 February 2003; accepted 24 March 2003)
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()� �*�+,-, �. /0���� SEM-EDX, ICP, BET, XRD 1� ���� �234� �*�+5. �2 46
4� �� /0�� ���7 ‘fly ash �����’� SO28 NOx ��� 9:;,< � = � >?,-, �� �
��� �. ������ ���@ AB ���� ��� SO28 NOx ��� � C 9�;�?5. �D ()E��
464� ������ ��F ��< G�� H�IJ 1� KB ��� L2,< G�� MNO&'� PQRS ‘fly ash
�����’F �TU;� �V2 1� W�R?! XY�5. Z , �� SO2 [ NOx ��� � ���< \��! "
��8 �����F ]; ���:B 1:9G ^,< _`a5.
Abstract − The simultaneous removal of SO2 and NOx by advanced absorbent from coal fly ash was examined in a packed
bed reactor. Also, the physicochemical properties of prepared absorbents have been measured using ICP, BET, SEM-EDX and
XRD. We have found that both SO2 and NOx in simulated flue gas can be effectively removed by use of fly ash advanced
absorbent which was prepared by hydration of calcined limestone with or without coal fly ash. The addition of fly ash into the
absorbents can result in the highly efficient simultaneous removal of SO2 and NOx from simulated flue gas. This is because the
addition of fly ash into limestone and advanced absorbent increases the specific surface area and hygroscopicity of fly ash
advanced absorbents by pozzolanic reaction which leads to the formation of calcium silicate compounds. The test results indi-
cated that the optimal mixing ratio of fly ash to advanced absorbent sample is about 1:9 for the effective removal of SOx/NOx.
Key words: Advanced Absorbent, Fly Ash, SO2, NOx, Pozzolanic Reaction, Calcium Silicate, Waste Incinerator, Flue Gas Des-
ulfurization
403
†To whom correspondence should be addressed.E-mail: [email protected]
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Calcium Silicate Hydrates
Ca(OH)2+Al2O3+H2OÛ(CaO)x(Al2O3)y(H2O)z (3)
Calcium Aluminate Hydrates
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Calcium Aluminate Silicate Hydrates
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Calcium Aluminate Calcium Sulfite Hydrates
(CaO)3SiO2+(1.3+x)H2OÛ(CaO)1.7(SiO2)(H2O)x+ 1.3Ca(OH)2 (6)
Tricalcium Silicate
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Table 1. Experimental variables and conditions
Experimental variables Experimental conditions
SO2 conc.(ppm) 1,800NOx conc. (ppm) 250
O2 conc. (%) 6Hydration time (hr) 24
Hydration temperature (oC) 90Slurrying velocity (rpm) 200
Reaction temp. (oC) 150Water content (%) 10
Absorbent amount (g) 1, 2Absorbents DY, JS, KG, PH
Advanced DY, JS, KG, PHAdditive Fly Ash
Fig. 1. Schematic diagram of the packed-bed experimental apparatus.
HWAHAK KONGHAK Vol. 41, No. 3, June, 2003
406 ��������������� �
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Fig. 2. Passing volume percentage and size analysis of fly ash.
Table 3. Analysis of fly ash (wt.%)
SiO2 Al2O3 Fe2O3 MnO BaO TiO2 CaO MgO P2O5Na2O K2O
Fly Ash 55.83 27.48 8.28 0.126 - 1.25 2.93 0.96 0.74 0.62 1.79
Fig. 3. XRD analysis of fly ash. Fig. 4. Pore volume of fly ash and advanced absorbent by BET.
Table 2. Analysis of domestic limestone in Korea (wt.%)
Components SiO2 Al2O3 Fe2O3 CaO MgO Igloss Test method
Contents
DY 1.62 0.07 0.12 54.7 0.25 42.9
KSE 3071-93JS 2.43 0.25 0.14 53.8 0.85 42.5KG 4.88 0.11 0.50 52.3 1.14 40.5PH 2.99 0.37 0.61 50.9 1.14 40.5
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H � �� Fig. 5, M?��N. �>¾ DY, JS, KG � PHX W� �
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,-� ;�� )�[8]X ?E&� ����0 SO2 1,800 ppm, �ºÞ
M 150oC, LÀ|O 6%� à �xX (�� ‘�O�L’s ‘fly ash
�O�L’� SO2 �º�H ¿���N. ��å ‘�O�L’,- 20
À: �b SO2z0 DY 0.726 mmol, JS 0.71 mmol, KG 0.68 mmol,
PH 0.542 mmol� 9F#Å$, ‘fly ash �O�L’X ;(�� 20À:
�� SO2z0 DY 1.026 mmol, JS 1.01 mmol, KG 0.98 mmol, PH
0.84 mmol� 9F#ÅN. Fig. 6� å ��� ��]X £�� ‘fly ash
�O�L’� SO2 �<; }� �O�LçN �L|H ¿�K L
%ÅN. ;¥� å � Jozewicz Rochelle� å s 7��&� ~
��N. Jozewicz Rochelle0 ��] £�, ��� @�#�
calcium silicate hydrate(CaSiO3-H2O); �º� ��, gh� 2�;
�$ ç$��&' �Ìm� ��s | LÀ|O� ��� ��bN
$ g8��N[18-21].
Fig. 7,-� �L� ���, \§ ?*� C�ñV 7H À.
�9 ��� SEM-EDXX ;(�� �dË ñVX i ��N. Fig. 7(a)
� 2?* aØ� .�., (b)� ç�V4��W 1)/ ��], (c)�
W� � LV�ºH �» �O�L, (d)� W��ºH ?ù �L,
��]X ~7 �¶� £��� �� ‘fly ash �O�L’X �Ô9
_;N. Fig. 7(a),- � b 3)� .�.0 }m; }}�$ 9�és �L!�=<; NW �GK _&� ã}#�, Fig. 7(b)� ��
]X 7� �,� 10µ;�� �uË3� E; |1#T %$ é
Hu Ë3s �d�m- IpJ� Ãz� �å7D Ë3o� ��#T
%�H ç� ÿN. Fig. 7(c)� W� � LV�ºH �» �O�L�
I9 (a)� �k å7mo; W� LV�º, ��� P� "0 Ë3
o� �e#Å�H ç�g$ %N. Fig. 7(d)� ��]X £�� ‘fly ash
�O�L’� �,� Ë3Ìm, K�!u�b éêë� CD; LV
�º, �5 å7V� �� ;ÉT>> î0 aØ� Ìm�; P� ï0
p�ÆÇ ^� ÈÉÊ�ÆÇ� LVCH @��S #$, Ë3� BET �
Ìm�, 9��L � 9�R9X ��?¹� _&� ¿�#ÅN[1-3].
Fig. 8 9,-� ��]� £� CtDs £��¶, �� SO2 �
NOx �?� �º�� ú;X ¿��9 ��� ‘�O�L’s £�
�¶; �7b ‘fly ash �O�L’X ;(�� �� � �D ���
H L"��N. ����0 à �x + LÀ|1O0 10%, �x�º
9 ��ÞM 150oC, �x1O 3 L/min, SO2, NO, NOx� 1Ë.M
1,800 ppm, 250 ppms 280 ppm&� ~7�S 1Ë?ù ½ 20À: L
"��N. ö÷ Fig. 8(a),-� ?*s ��]X 9:1� �¶� ���
� �� �O�LX ;(�� ��VC DW�VC� �?�
��å X L"� å ;', ��å 9:1� £� �¶� ‘fly ash �
O�L’ 2 g, 20À: �b SO2, NO, NOx� �O0 2.501, 0.249,
0.271 mmol ;ÅN. Fig. 8(b),-� ?*s ��]X 8:2� �¶� �
��� �� ‘fly ash �O�LX ;(�� �� � �D��H L
"� å ;', ?*s ��]X 8:2� £� �¶~ 2� ‘fly ash �O
�L’ 2 g, 20À: �b SO2, NO, NOx� �O0 ff 2.086,
Fig. 6. Total removal efficiency of SO2 for advanced absorbent and flyash.
Fig. 7. Comparison of SEM depend on absorbent shape and prepara-tion methods. (a) limestone fresh, (b) fly ash, (c) advancedabsorbent, and (d) fly ash advanced absorbent.
Fig. 5. Effect of absorbent kinds on surface area of fly ash and advancedabsorbent.
HWAHAK KONGHAK Vol. 41, No. 3, June, 2003
408 ��������������� �
on
n-
on
I
-
ical
or-
H.,
0.236, 0.236 mmol ;ÅN. \�- ��]� £�� ��� ��VC
DW�VC ��¶, M7�� ¸H g� _&� ¿�#Å&', �
�]� £�� ��� SO2N� µ;� NOx � �º� õ? ���
� _&� ¿�#ÅN.
Fig. 9,-� ��]� O� ���X å7�9 ��� ��] ��
�¶H ñV?¹' ‘fly ash �O�L’X ��� ��/�D �?
� ��H L"� å X M?��N. ����0 LÀ|1O 10%, �
LO 2 g, SO2� 1Ë.M 1,800 ppm, NO� .M 250 ppm, �x�
º9 ��ÞM 150oC, �x1O 3 L/minX 9ÿ&� ��H L"��
N. �O�L�H ;(�� �b ?* 2 g, 20À: �b SO2,
NO, NOx �O0 ff 1.9530, 0.1570, 0.1750 mmolH �Ô�Å&', ?
*s ��]X 7:3� �¶� £�� ‘fly ash �O�L’ 2 g, 20À:
�b SO2, NO, NOx� �O0 2.042, 0.199, 0.221 mmolH �Ô�
ÅN. Fig. 9� å X n�K 2 SO2/NOx Ãl ��]X 10% £��
9:1� �¶,- �8 �L� SO2/NOx �¶H �Ô�ÅN. ;¥� å
� ��] £�� ��� W�!LV �ºb �Ls� éêë �
º; 1M#T p�ÆÇ(calcium silicate), calcium aluminate, calcium
aluminate silicate y; @�#Å9 2F� _&� ã}bN[1-3, 26]. ̂
� éêë �º, ��� @�b p�Z CD; å7V� �� ;ÉT
>> î0 LVCH @�[18-23]�� �L� �+�H ��?% çN
� �� SO2/NOx �L� !"#� _&� *bN. \�- ��]X
£�� ‘fly ash �O�L’� � �Ìm� 9��Ls á0 C�
� �a; ¸a#$ @�b LVC, �� �+<; ���� ���
x ��, çN � �� _&� ¿�#ÅN.
5. � �
P9CWf� � v)���7,- �@�� )Wv�xs �L�
�º��H � �9 ��� SEM-EDX, ICP, BET, pore volume, Ñ�
� ËMÀ.9 yH ;(�� C�À.H L"��&', ��]s �L
X ;(�� �� ¯��LX ;(�� +tWuWf� � v)
���7,- �@�� ���xs DW�VCH �?, ��9 �
� $7Ä�º9 ��H L"��N. ;a� ��H L"� å N�
á0 åQH ÐÅN. ��]X £�� �L� �Ìm� 9�À
é� ��]X £��> î0 �Ls ���� p�ÆÇ(calcium
silicate), calcium aluminate, calcium aluminate silicate y á0 LV
C @�&� ��� éêë�º; 1M#T ���� _&� ¿�#Å
&', ���x ��¶ � �L!�=<; 9: ?*, �5 ��|
H ¿���N. ;s | ‘�O�L’s ‘fly ash �O�L’� SO2
���H L"� å , �>¾ ?*� ��VC� �O0 DYRJSR
KGRPH�&� �8 �º�; 80 ?*� DY;ÅN. ¤�$ ��]
X SO2 � NOx �?�( £�� �(K L %�H ¿���&',
��]s �O�L� O� £��¶0 1:9,- O�� ��H �Ô�
ÅN. ^�, ��]X £�� ‘fly ash �O�L’� SO2/NOx �(
�L, P9C Wf� � v)���7( �L� øÀ� �(K L
%H _&� ã}bN.
���
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HWAHAK KONGHAK Vol. 41, No. 3, June, 2003