IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0272803
(2005-11-15)
|
등록번호 |
US-7458325
(2008-12-02)
|
발명자
/ 주소 |
- Hopper,Daniel C.
- Hopper,Trudy J.
|
출원인 / 주소 |
- Bio Solids Remediation Corp.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
21 |
초록
▼
A high throughput process and apparatus for thermal remediation of bio-solids, e.g., bio-sludge from wastewater treatment plants, has a dryer with a high capacity heat source to volatilize and combust the compounds contained in a first lot of bio-solids. The thermally treated bio-solids are discharg
A high throughput process and apparatus for thermal remediation of bio-solids, e.g., bio-sludge from wastewater treatment plants, has a dryer with a high capacity heat source to volatilize and combust the compounds contained in a first lot of bio-solids. The thermally treated bio-solids are discharged and cooled. Hot gases and fines formed are drawn into a second dryer where a second lot of bio-solids are used to cool the hot gases/fines mixture. An exhaust cooling recirculating unit is used to further cool the gas/fines mixture and separate courser fines before entering the bag house. Additional separation of the fines from gases is achieved in a baghouse or other suitable device for separating fine particles from gas.
대표청구항
▼
What is claimed is: 1. A process for thermally treating bio-solids, comprising the steps of: heating a first lot of bio-solids in a first rotatable container such that organic compounds present therein volatilize and combust and moisture present is driven off the first lot of bio-solids to form a f
What is claimed is: 1. A process for thermally treating bio-solids, comprising the steps of: heating a first lot of bio-solids in a first rotatable container such that organic compounds present therein volatilize and combust and moisture present is driven off the first lot of bio-solids to form a first lot of thermally treated bio-solids and a first volume of hot gases and fines; removing the first lot of thermally treated bio-solids from the first container, transporting the first volume of hot gases and fines to a second rotatable container and introducing a second lot of bio-solids to the second rotatable container, and contacting the first volume of hot gases and fines with the second lot of bio-solids in the second rotatable container, the second lot being in an amount sufficient to simultaneously cool the gases and fines in the first volume to a desired temperature while heating the second lot of bio-solids such that organic compounds present therein volatilize and combust and moisture present is driven off the second lot of bio-solids to form a second lot of thermally treated bio-solids and a second volume of hot gases and fines; separating the hot gases from the fines in the second volume; and removing the second lot of thermally treated bio-solids from the second rotatable container. 2. The process of claim 1, wherein the first rotatable container has inner substantially cylindrical sidewalls which are longitudinally aligned with and revolve about a longitudinal axis of the first rotatable container, wherein in the first container the bio-solids contact a series of flights arranged along the inner walls. 3. The process of claim 2, wherein the first container inner walls have an upstream portion proximal to a burner and a downstream portion distal to a burner, wherein the flights arranged on the upstream portion of the first container inner sidewalls comprise lifters and wherein the flights arranged on the downstream portion of the first container inner sidewalls comprise rakes, wherein at least a plurality of the lifters have a closed end distal to the burner. 4. The process of claim 3, wherein the first rotatable container inner walls have an intermediate portion between the upstream portion and the downstream portion, wherein the flights arranged on the intermediate portion of the first rotatable container inner sidewalls comprise lifters and rakes. 5. The process of claim 1, wherein the second container has inner substantially cylindrical sidewalls which are longitudinally aligned with and revolve about a longitudinal axis of the second container, wherein in the second container the bio-solids contact a series of flights arranged along the inner walls. 6. The process of claim 5, wherein the second container inner walls have an upstream portion and a downstream portion, wherein the flights arranged on the upstream portion of the second container inner sidewalls comprise lifters and wherein the flights arranged on the downstream portion of the second container inner sidewalls comprise rakes, wherein at least a plurality of the lifters have a closed end distal to the upstream end of the second rotatable container. 7. The process of claim 6, wherein the second container inner walls have an intermediate portion between the upstream portion and the downstream portion, wherein the flights arranged on the intermediate portion of the second container inner sidewalls comprise lifters and rakes. 8. The process of claim 1, wherein the first container has inner substantially cylindrical sidewalls which are longitudinally aligned with and revolve about a longitudinal axis of the first container, wherein a flame is discharged into the first container and the first container has rows of flights, wherein a first row of the flights most proximal to an upstream end of the first container has flights comprising lifters to veil the flame from about the 10:00 to about the 2:00 position, and another row of flights, downstream of the first row of flights, including lifters and rakes, and the remainder of the rows of flights downstream of the another row of flights comprises rakes to break up the bio-solids, wherein at least a plurality of the lifters have a closed end distal to the burner. 9. The process according to claim 1, wherein the first lot of bio-solids comprises raw bio-solids. 10. The process according to claim 1, wherein the first lot of bio-solids comprises thermally treated bio-solids previously removed from the first or second container. 11. The process according to claim 1, wherein the second lot of bio-solids comprises raw bio-solids. 12. The process according to claim 1, wherein the second lot of bio-solids comprises thermally treated bio-solids previously removed from the first or second container. 13. The process according to claim 1, wherein the first lot of bio-solids is fed to the first container at a rate of at least 125 tons per hour of bio-solids on a wet basis, and comprises raw bio-solids. 14. The process of claim 1, further comprising blending a portion of the fines from the second volume with the first lot of thermally treated bio-solids. 15. The process of claim 1, further comprising blending a portion of the fines from the second volume with the second lot of thermally treated bio-solids. 16. The process of claim 1, wherein the first container comprises a first rotatably supported dryer and the second container comprises a second rotatably supported dryer. 17. The process of claim 16, wherein the first lot of bio-solids passes from a first set of feeder bins into the first rotatably supported dryer and the second lot of bio-solids passes from a second set of feeder bins to the second rotatably supported dryer. 18. A process according to claim 16, wherein a burner is provided at an upstream end of the first dryer and heats the first dryer, wherein the first lot of bio-solids is introduced into the upstream end of the first dryer.
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