Manufacturing facility for quicklime, and manufacturing facility and manufacturing process for slaked lime

Patent metadata

Field	Value
Publication number	US-9914663-B2
Application number	US-201113885701-A
Country	US
Kind code	B2
Filing date	Nov 21, 2011
Priority date	Mar 28, 2011
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A manufacturing facility for quicklime is provided, which can manufacture highly active quicklime by a simple manufacturing facility, and which can also separate and recover, in a high concentration, CO 2 gas generated at the time of manufacturing quicklime. The manufacturing facility for quicklime is configured by including: a regenerative calciner 11 which has a supply port 11 a for supplying granular limestone C into the regenerative calciner 11 , heating means capable of maintaining the temperature of the atmosphere in the regenerative calciner 11 at a temperature not less than the calcination temperature of the limestone, an exhaust pipe 15 connected to an upper part of the regenerative calciner 11 so as to discharge combustion exhaust gas of the heating means and CO 2 gas generated by the calcination of limestone, and a discharge port 14 for taking out quicklime produced by the calcination; and a heat medium 16 which has a particle diameter larger than the particle diameter of the limestone and which is filled in the regenerative calciner 11.

First claim

The invention claimed is:

1. A facility for manufacturing slaked lime, the facility comprising:
an apparatus for manufacturing quicklime, comprising
(i) a regenerative calciner comprising
a supply port configured to supply granular limestone into the regenerative calciner,
a heater configured to maintain temperature of an atmosphere in the regenerative calciner at a temperature not less than a calcination temperature of the granular limestone,
an exhaust pipe connected to an upper part of the regenerative calciner and configured to discharge combustion exhaust gas from the heater and CO 2 gas generated by calcination of the granular limestone,
a three-way selector valve connected to the exhaust pipe such that the three-way selector valve is positioned between the upper part of the regenerative calciner and a heat exchanger, and
a discharge port configured to remove quicklime produced by the calcination therefrom, and

(ii) a heat medium having a particle diameter larger than a particle diameter of the granular limestone, the heat medium being filled in the regenerative calciner,

a slaking machine configured to produce slaked lime by supplying slaking water to quicklime manufactured in the apparatus;
an aging machine configured to age the slaked lime discharged from the slaking machine;
a drying machine configured to dry the slaked lime comprising water and aged in the aging machine; and
the heat exchanger configured to supply, as a heat source of the drying machine, steam generated by heat exchange between water and the combustion exhaust gas or the CO 2 gas discharged from the exhaust pipe of the apparatus,
wherein a first discharge side port of the three-way selector valve is connected to a first transfer pipe,
a second discharge side port of the three-way selector valve is connected to a second transfer pipe, and
the first transfer pipe and the second transfer pipe are connected to the heat exchanger and configured to respectively feed the combustion exhaust gas and the CO 2 gas to the heat exchanger.

2. The facility according to claim 1 , wherein the heat medium is quicklime.

3. The facility according to claim 1 , further comprising a buffer tank configured to temporarily store the quicklime removed from the discharge port, wherein the buffer tank is positioned between the apparatus and the slaking machine.

4. A manufacturing process, comprising:
manufacturing slaked lime with the facility according to claim 1 ; and
recovering the CO 2 gas having passed through the heat exchanger.

5. The facility according to claim 1 , wherein the heat exchanger comprises a heat source discharge pipe and a second three-way selector valve connected to the heat source discharge pipe.

6. The facility according to claim 5 , wherein
a first discharge side port of the second three-way selector valve is connected to a first discharge pipe, and
a second discharge side port of the second three-way selector valve is connected to a second discharge pipe.

7. The facility according to claim 1 , wherein the facility comprises a plurality of the apparatus.

8. The facility according to claim 1 , wherein the granular limestone has a diameter of from 10 μm to 1 mm.

9. A facility for manufacturing slaked lime, the facility comprising:
an apparatus for manufacturing quicklime, comprising
(i) a regenerative calciner comprising
a supply port configured to supply granular limestone into the regenerative calciner,
a heater configured to maintain temperature of an atmosphere in the regenerative calciner at a temperature not less than a calcination temperature of the granular limestone,
an exhaust pipe connected to an upper part of the regenerative calciner and configured to discharge combustion exhaust gas from the heater and CO 2 gas generated by calcination of the granular limestone,
a three-way selector valve connected to the exhaust pipe, and
a discharge port configured to remove quicklime produced by the calcination therefrom, and

(ii) a heat medium having a particle diameter larger than a particle diameter of the granular limestone, the heat medium being filled in the regenerative calciner;

a slaking machine configured to produce slaked lime by supplying slaking water to quicklime manufactured in the apparatus;
an aging machine configured to age the slaked lime discharged from the slaking machine;
a drying machine configured to dry the slaked lime comprising water and aged in the aging machine; and
a heat exchanger configured to supply, as a heat source of the drying machine, steam generated by heat exchange between water and the combustion exhaust gas or the CO 2 gas discharged from the exhaust pipe of the apparatus,
wherein a first discharge side port of the three-way selector valve is connected to a first transfer pipe,
a second discharge side port of the three-way selector valve is connected to a second transfer pipe, and
the first transfer pipe and the second transfer pipe are connected to the heat exchanger and configured to respectively feed the combustion exhaust gas and the CO 2 gas to the heat exchanger.

10. A manufacturing process for producing slaked lime, comprising:
manufacturing slaked lime with the facility according to claim 9 ; and
recovering the CO 2 gas having passed through the heat exchanger.

11. The facility according to claim 9 , wherein the heat exchanger comprises a heat source discharge pipe and a second three-way selector valve connected to the heat source discharge pipe.

12. The facility according to claim 11 , wherein
a first discharge side port of the second three-way selector valve is connected to a first discharge pipe, and
a second discharge side port of the second three-way selector valve is connected to a second discharge pipe.

13. The facility according to claim 9 , wherein the heat medium is quicklime.

14. The facility according to claim 9 , further comprising a buffer tank configured to temporarily store the quicklime removed from the discharge port, wherein the buffer tank is positioned between the apparatus and the slaking machine.

15. The facility according to claim 9 , wherein the facility comprises a plurality of the apparatus.

16. The facility according to claim 9 , wherein the granular limestone has a diameter of from 10 μm to 1 mm.

Assignees

• Higuchi Naohiro
• Shima Hirokazu
• Mitsubishi Materials Corp

Inventors

• Higuchi Naohiro
• Shima Hirokazu

Classifications

• C04B2/10

  Preheating, burning calcining or cooling (decarbonation during burning of cement raw materials C04B7/43; {obtaining CaO or MgO otherwise than by thermal decomposition of the corresponding carbonates C01F11/02, C01F5/02}) · CPC title

• C04B2/04 Primary

  Slaking {(simultaneous dehydrating of gypsum and slaking of lime C04B11/022)} · CPC title

• C04B2/106

  in fluidised bed furnaces · CPC title

• Y02P40/42

  Cross-Sectional Technologies · mapped topic

• C04B2/08 Primary

  Devices therefor · CPC title