H
2
SO
3
(l)
↔
H
+
+HSO
3
-
(1-2)
HSO3
-
↔
H
+
+SO
3
2-
(1-3)
石灰石吸收剂溶解、中和反应为:
CaCO
3
(s) CaCO
3
(l
)
(1-4)
CaCO
3
( l ) + H
+
+HSO
3
-
→
Ca
2+
+ SO
3
2-
+H
2
O+CO
2
(1-5)
Ca(OH)
2
→
Ca
2+
+2OH
-
(1-6)
Ca
2+
+2OH
-
+H
+
+ HSO
3
-
→
Ca
2+
+ SO
3
2-
(1-7)
SO
3
2-
+ H
+
→
HSO
3
-
(1-8)
氧
化
反
应
为
:
SO
3
2-
+1/2O
2
→
SO
4
2-
(1-9)
HSO
3
-
+1/2O
2
→
SO
4
2-
+H
+
(1-10)
结晶析出为:
Ca
2+
+SO
3
2-
+1/2H
2
O
→
CaSO
3
·1/2H
2
O(s) (1-
11)
Ca
2+
+SO
3
2-
+2H
2
O
→
CaSO
4
·2H
2
O(s) (1-12)
总反应方程式为:
CaCO
3
+1/2H
2
O+SO
2
→
CaSO
3
·1/2H
2
O+CO
2
(g)
(1-13)
CaCO
3
+2H
2
O+SO
2
+1/2O
2
→
CaSO
3
·2H
2
O+CO
2
(g)
(1-14)
Ca(OH)
2
+SO
2
→
CaSO
3
·1/2H
2
O+1/2H
2
O (1-