Gypsum dewatering device for desulfurization facility
View Patent ↗A gypsum dewatering device 2 installed in a desulfurization facility 105 in which sulfur oxide in flue gas G is absorbed by limestone in an absorber 1 , includes a belt filter 22 that absorbs sulfur oxide and dewaters gypsum slurry SS fed from the absorber 1 to form a gypsum cake SC, a vacuum suction mechanism 23 that sucks moisture in the gypsum cake SC via the belt filter 22 , a moisture measuring means H 1 that measures a moisture content of the gypsum cake SC to be dewatered by the belt filter 22 , a heating means 25 that heats the gypsum cake SC dewatered by the belt filter 22 by hot water or steam, and a control means 26 that controls a heated state by the heating means 25 when the moisture content of the gypsum cake SC input from the moisture measuring means H 1 has exceeded a predetermined amount.
1. A gypsum dewatering device for a desulfurization facility that is installed in a desulfurization facility in which sulfur oxide in flue gas is absorbed by limestone in an absorbent in an absorber, comprising:
a belt filter that absorbs the sulfur oxide and dewaters gypsum slurry fed from the absorber to form a gypsum cake;
a vacuum suction mechanism that sucks moisture in the gypsum cake via the belt filter;
a moisture measuring unit that measures a moisture content of the gypsum cake to be dewatered by the belt filter;
a heating unit that heats the gypsum cake to be dewatered by the belt filter by hot water or steam; and
a control unit that controls a heated state by the heating unit, when a moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount.
2. The gypsum dewatering device for a desulfurization facility according to claim 1 , further comprising a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the suction-pressure measuring unit has deviated from a predetermined set value, the control unit controls a heated state by the heating unit.
3. The gypsum dewatering device for a desulfurization facility according to claim 1 , further comprising an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input from the impurity salt concentration measuring unit has deviated from a predetermined set value, the control unit controls a heated state by the heating unit.
4. The gypsum dewatering device for a desulfurization facility according to claim 1 , further comprising a specific resistance-to-filtration measuring unit that measures a specific resistance to filtration of the gypsum cake, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the specific resistance-to-filtration measuring unit has deviated from a predetermined set value, the control unit controls a heated state by the heating unit.
5. The gypsum dewatering device for a desulfurization facility according to claim 1 , further comprising:
a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism; and
an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from at least one of the suction-pressure measuring unit and the impurity salt concentration measuring unit has deviated from a predetermined set value, the control unit controls a heated state by the heating unit.
6. The gypsum dewatering device for a desulfurization facility according to claim 1 , further comprising:
a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism;
an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber; and
a specific resistance-to-filtration measuring unit that measures a specific resistance to filtration of the gypsum cake, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from at least one of the suction-pressure measuring unit, the impurity salt concentration measuring unit, and the specific resistance-to-filtration measuring unit has deviated from a predetermined set value, the control unit controls a heated state by the heating unit.
7. The gypsum dewatering device for a desulfurization facility according to claim 1 , further comprising a surface-temperature measuring unit that measures a surface temperature of the gypsum cake, wherein
when a surface temperature input from the surface-temperature measuring unit is not equal to or lower than a predetermined value, the control unit controls to decrease heating by the heating unit.
8. A gypsum dewatering device for a desulfurization facility that is installed in a desulfurization facility in which sulfur oxide in flue gas is absorbed by limestone in an absorbent in an absorber, comprising:
a belt filter that absorbs the sulfur oxide and dewaters gypsum slurry fed from the absorber to form a gypsum cake;
a vacuum suction mechanism that sucks moisture in the gypsum cake via the belt filter;
a moisture measuring unit that measures a moisture content of the gypsum cake to be dewatered by the belt filter;
a speed varying unit that varies a belt advancing rate by the belt filter; and
a control unit that controls a belt advancing rate by the speed varying unit, when a moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount.
9. The gypsum dewatering device for a desulfurization facility according to claim 8 , further comprising a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the suction-pressure measuring unit has deviated from a predetermined set value, the control unit controls a belt advancing rate by the speed varying unit.
10. The gypsum dewatering device for a desulfurization facility according to claim 8 , further comprising an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the impurity salt concentration measuring unit has deviated from a predetermined set value, the control unit controls a belt advancing rate by the speed varying unit.
11. The gypsum dewatering device for a desulfurization facility according to claim 8 , further comprising a specific resistance-to-filtration measuring unit that measures a specific resistance to filtration of the gypsum cake, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the specific resistance-to-filtration measuring unit has deviated from a predetermined set value, the control unit controls a belt advancing rate by the speed varying unit.
12. The gypsum dewatering device for a desulfurization facility according to claim 8 , further comprising:
a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism; and
an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from at least one of the suction-pressure measuring unit and the impurity salt concentration measuring unit has deviated from a predetermined set value, the control unit controls a belt advancing rate by the speed varying unit.
13. The gypsum dewatering device for a desulfurization facility according to claim 8 , further comprising:
a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism;
an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber; and
a specific resistance-to-filtration measuring unit that measures a specific resistance to filtration of the gypsum cake, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from at least one of the suction-pressure measuring unit, the impurity salt concentration measuring unit, and the specific resistance-to-filtration measuring unit has deviated from a predetermined set value, the control unit controls a belt advancing rate by the speed varying unit.
14. A gypsum dewatering device for a desulfurization facility that is installed in a desulfurization facility in which sulfur oxide in flue gas is absorbed by limestone in an absorbent in an absorber, comprising:
a belt filter that absorbs the sulfur oxide and dewaters gypsum slurry fed from the absorber to form a gypsum cake;
a vacuum suction mechanism that sucks moisture in the gypsum cake via the belt filter;
a moisture measuring unit that measures a moisture content of the gypsum cake to be dewatered by the belt filter;
a heating unit that heats the gypsum cake to be dewatered by the belt filter by hot water or steam;
a speed varying unit that varies a belt advancing rate by the belt filter; and
a control unit that controls both a heated state by the heating unit and a belt advancing rate by the speed varying unit, when a moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount.
15. The gypsum dewatering device for a desulfurization facility according to claim 14 , further comprising a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the suction-pressure measuring unit has deviated from a predetermined set value, the control unit controls both a heated state by the heating unit and a belt advancing rate by the speed varying unit.
16. The gypsum dewatering device for a desulfurization facility according to claim 14 , further comprising an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the impurity salt concentration measuring unit has deviated from a predetermined set value, the control unit controls both a heated state by the heating unit and a belt advancing rate by the speed varying unit.
17. The gypsum dewatering device for a desulfurization facility according to claim 14 , further comprising a specific resistance-to-filtration measuring unit that measures a specific resistance to filtration of the gypsum cake, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from the specific resistance-to-filtration measuring unit has deviated from a predetermined set value, the control unit controls both a heated state by the heating unit and a belt advancing rate by the speed varying unit.
18. The gypsum dewatering device for a desulfurization facility according to claim 14 , further comprising:
a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism; and
an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from at least one of the suction-pressure measuring unit and the impurity salt concentration measuring unit has deviated from a predetermined set value, the control unit controls both a heated state by the heating unit and a belt advancing rate by the speed varying unit.
19. The gypsum dewatering device for a desulfurization facility according to claim 14 , further comprising:
a suction-pressure measuring unit that measures a suction pressure by the vacuum suction mechanism;
an impurity salt concentration measuring unit that measures a salt concentration as impurities in the absorber; and;
a specific resistance-to-filtration measuring unit that measures a specific resistance to filtration of the gypsum cake, wherein
when the moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount and an input value from at least one of the suction-pressure measuring unit, the impurity salt concentration measuring unit, and the specific resistance-to-filtration measuring unit has deviated from a predetermined set value, the control unit controls both a heated state by the heating unit and a belt advancing rate by the speed varying unit.
20. The gypsum dewatering device for a desulfurization facility according to claim 14 , further comprising a surface-temperature measuring unit that measures a surface temperature of the gypsum cake, wherein
when a surface temperature input from the surface-temperature measuring unit is not equal to or lower than a predetermined value, the control unit controls to decrease heating by the heating unit.
21. The gypsum dewatering device for a desulfurization facility according to claim 6 , further comprising:
a desulfurization-amount measuring unit that measures an absorption amount of the sulfur oxide in the absorber;
a transporting-rate varying unit that varies a transporting rate of the gypsum cake to be dewatered by the belt filter; and
a speed varying unit that varies a belt advancing rate of the belt filter, wherein
when a moisture content of the gypsum cake input from the moisture measuring unit has exceeded a predetermined amount, if each input value of the suction-pressure measuring unit, the impurity salt concentration measuring unit, and the specific resistance-to-filtration measuring unit does not deviate from a predetermined set value, the control unit controls both an increase in the transporting rate of the transporting-rate varying unit and the belt advancing rate of the speed varying unit, when the absorption amount input from the desulfurization-amount measuring unit has exceeded a predetermined amount.