초록 ▼

<1차연도>
진공유중 건조설비 개선:
매체유 회수기의 내부구조 변경을 통한 건조슬러지 함유량 저감 및 회수율 증대
GR 하수슬러지 연료탄에 혼합되는 최적 첨가제 도출:
화석연료 첨가제 시장조사 및 건조슬러지 혼합 비율 검토 석탄계 첨가제 조사 (무연, 유연,열유, 타사 건조슬러지 연료탄 등)
<2차연도>
연료탄 최적 첨가 혼합비율 및 첨가제 제조기법 최적화 도출:
석탄계 첨가제 건조슬러지 혼합 비율에 따른 물성 조사(무연탄 1:9, 유연탄 1.5:8.5)
GR 하수슬러지 연료탄의 고효율화

<1차연도>
진공유중 건조설비 개선:
매체유 회수기의 내부구조 변경을 통한 건조슬러지 함유량 저감 및 회수율 증대
GR 하수슬러지 연료탄에 혼합되는 최적 첨가제 도출:
화석연료 첨가제 시장조사 및 건조슬러지 혼합 비율 검토 석탄계 첨가제 조사 (무연, 유연,열유, 타사 건조슬러지 연료탄 등)
<2차연도>
연료탄 최적 첨가 혼합비율 및 첨가제 제조기법 최적화 도출:
석탄계 첨가제 건조슬러지 혼합 비율에 따른 물성 조사(무연탄 1:9, 유연탄 1.5:8.5)
GR 하수슬러지 연료탄의 고효율화 및 저탄소 연소기법 최적화 도출:
소규모 연소테스트를 통한 석탄계 첨가제 연소효율 점검(연소염화능 분석, 열중량 분석 등)
<3차연도>
GR 하수슬러지 연료탄의 고효율화 및 저탄소 연소기법 최적화 도출:
비석탄계 첨가제 조사 및 제조 혼합 비율 물성 분석(페트로 코크스 1:9∼2:8최적)
GR 하수슬러지 연료탄의 최적 활용을 위한 연소기법 도출:다단으로 구성된 화격자식 연소기 제작 및 시운전을 통한 연소 확인

Abstract ▼

Ⅳ. Results
In this study, the technologies to produce sewage sludge solid fuel that will not produce bad smell and secondary environmental pollution as well as the combustion technologies were developed with the application of fry-drying
technique in the vacuum.
1) Selection of the Optimum

Ⅳ. Results
In this study, the technologies to produce sewage sludge solid fuel that will not produce bad smell and secondary environmental pollution as well as the combustion technologies were developed with the application of fry-drying
technique in the vacuum.
1) Selection of the Optimum oil
With an aim to use an environment-friendly oil, ion refined oil products from six companies were analyzed. The selected oil(Company E) produced higher caloric value and lower sulfur rate.
2) Development of oil separate system
For the collection of oil, a centrifugal separator was applied as pre-processing. Dry sludge released from the centrifugal separator was placed on top of the collector and hot air was supplied from the bottom based on the indirect heating method. The following is the major components of oil separate system.
Dry sludge released from the centrifugal separator was introduced into the oil separate system vertically. It remained within the system for 45 minutes. The number of wings for mixing heater as nine and the interval was 45mm. This improved the content of oil within the dry sludge to meet 2% or below. oil separate system was developed with a capacity to collect 0.4 ton per day, followed by a pilot operation. The results were summed up for commercialization of the device to collect 14 tons per day.
3) Selection of the Optimum Coal Additive
Based on the results of TGA analysis, coal mixed with flaming coal and cokes as additives showed changes at lower temperature than other samples. It produced less ash contents and was found to be appropriate as an additive. Based on the analysis of chute-mixed coal, the results were similar to those of anthracite and flaming coal. However, it was discarded as an additive as the supply of chute tended to be difficult. Therefore, coal mixed with cokes and flaming coal was decided to be appropriate as a sample subject to analysis
TGA Analysis of Fuel Coal by Type of Additive:
1.Sludge, 2.Sludge-chute, 3.Sludge-cokes, 4.Sludge-anthracite, 5.Sludge-flaming coal, 6.Sludge-cokes-anthracite
As a result of analysis of combustion characteristics, solid fuel mixed with anthracite as an additive marked the longest combustion continuation while combustion of general dry sludge solid fuel samples was incomplete and unsound. Solid fuel mixed with petro-cokes as an additive produced sound combustion statuses at 10, 15 and 20% of the weight mixture ratio. However, the most appropriate was solid fuel mixed with petro-cokes at 10% to ensure minimum application of additives.
As a result of the component analysis, coal containing coal additives were similar in their water content, ash content, volatile content and caloric value while as for fixed carbon contents, only that containing anthracite as an additive satisfied the standards for excellent product reuse. As for solid fuel mixed with non-coal cokes, all items satisfied the standards for excellent product reuse. Considering economic benefits out of additives, 10% was found to be appropriate.
4) Development of the Sewage Sludge Solid Fuel Combustion Device
A fire grate-type combustion device was developed to release ash and ensure stable combustion considering the characteristics of combustion of sewage sludge solid fuel. A stair-shaped combustion furnace and a reciprocating plate were applied for homogenous combustion of solid fuel.
● Method of fuel injection: screw-decelerating motor-based automatic supply
● Method of ignition: spark-based ignition
● Fire grate ash transfer: Plate reciprocation-base ash transfer
● Accessory facility: air blower, ventilator, circulating motor, economizer, etc.
5) Development of the Method of Using Ash
Based on the results of analysis of ingredients in incinerated solid fuel, all items produced values below the standards for reuse. Under the domestic conditions, the market size for soil-improving preparations and secondary concrete products is small and continued consumption is not guaranteed. Therefore, the method of using as a cement raw material enabling stable consumption was found to be appropriate.