IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0840976
(2004-05-07)
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발명자
/ 주소 |
- Ramharter, Peter Michael
- Bayer, Harald
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
17 인용 특허 :
4 |
초록
▼
The invention relates to a process and apparatus for treating biogenic residues, particularly sludges, preferably in the area of a clarification plant. Biogenic residues with a variable dry substance are subjected to aerobic drying until an energy-independent thermal treatment can be carried out. Du
The invention relates to a process and apparatus for treating biogenic residues, particularly sludges, preferably in the area of a clarification plant. Biogenic residues with a variable dry substance are subjected to aerobic drying until an energy-independent thermal treatment can be carried out. During the drying process, evaporated water is discharged in an odor-free condition without releasing freely volatile components, the dried sludge is intermediately stored a number of times and then utilized in preferably a number of successive thermal treatment steps. The two-stage cleaning of the stream of waste gas includes a dust collection unit and an adsorption unit. The waste heat is recycled through a heat exchanger to generate heat and electricity. The apparatus for carrying out the process includes a wet sludge storage container (1), a low temperature drying system (2), storage containers (3, 5) for intermediate storage of the dried biogenic residues, and a thermal treatment system with one or more thermal treatment steps (7, 8). Cleaning of the flue gas takes place preferably by means of a primary cleaning step (10) and a secondary cleaning step (11) for adsorption, for example, with clarified water. Energy recovery (9) from the hot waste gas is ideally carried out before the flue gas cleaning.
대표청구항
▼
1. Process for treating biogenic residues, particularly sludges, preferably in the area of a sewage treatment plant, characterized by the following process steps:(a) Collecting biogenic residues with variable dry substance content followed by aerobic drying in a temperature range up to a maximum of
1. Process for treating biogenic residues, particularly sludges, preferably in the area of a sewage treatment plant, characterized by the following process steps:(a) Collecting biogenic residues with variable dry substance content followed by aerobic drying in a temperature range up to a maximum of 60?70° C.;(b) Maintaining the drying step until reaching a level of drying of the biogenic residues which permits energy-independent utilization;(c) Discharging with the moist stream of air only the amount of water evaporated during drying without the release of freely volatizing compounds;(d) storing the dried material in primary intermediate storage, particularly for equalization of different drying stages;(e) storing the dried material in a secondary intermediate storage as a buffer;(f) thermally treating the material in a number of successive thermal treatment steps;(g) discharging residues of the treatment from each of the thermal treatment steps;(h) Cleaning the streams of material arising during thermal treatment in primary and secondary cleaning steps, the material stream being filtered in the primary step, especially by means of dust collection, and by adsorption of the stream in the secondary cleaning step; and(i) recovering energy from all material streams brought out of the process by conducting the energy to a heat transfer medium.2. Process as described in claim 1, wherein the starting material used is wet or previously dewatered sludge, whereby the dry substance can be between 2% and 35%.3. Process as described in claim 1, wherein the dry air needed for drying the biogenic residues is preheated by the waste heat of the thermal treatment steps.4. Process as described in claim 1, wherein the thermal treatment of the biogenic residues is carried out without an additional external supply of energy.5. Process as described in claim 1, wherein the step of dewatering the biogenic residues is done only to that level as maximum where downstream energy-independent thermal utilization can be carried out.6. Process as described in claim 1, wherein the homogenization of the material takes place in the primary intermediate storage container.7. Process as described in claim 1, wherein additional biogenic material is supplied to the primary intermediate storage container.8. Process as described in claim 1, wherein dried biogenic residues are discharged from the primary intermediate storage container and supplied to an external application.9. Process as described in claim 1, wherein the thermal treatment comprises at least one primary and one secondary treatment step.10. Process as described in claim 9, wherein substitution materials are supplied prior to the primary thermal treatment.11. Process as described in claim 9 or 10, wherein substitution materials are supplied directly to the primary thermal treatment step.12. Process as described in claim 9, wherein sterilization of the material takes place in at least one of the thermal treatment steps.13. Process as described in claim 1, wherein selective use is made of an agent for adsorption in the second cleaning step selected from the group consisting of lime, sodium carbonate, hydrate of white lime, activated charcoal, soda and sorbalite.14. Process as described in claim 1, wherein water from the settling basin is used for waste gas cleaning.15. Process as described in claim 14, wherein the material streams are conducted for adsorption through the waste water basin of the sewage treatment plant.16. Process as described in claim 14, wherein waste water is injected into the material stream.17. Process as described in claim 1, wherein the waste gas cleaning is carried out by separating the material stream into its components.18. Process as described in claim 1, wherein the energy of the waste gases is fed to one or more heat exchangers for the production of electricity, steam or hot water.19. Process as described in claim 18, wherein the hot water is provided for heating the drying and combustion air.20. Process as described in claim 18, wherein the hot water is used in a decentralized heating network.
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