BRPI0604713A - system for increasing the thermal efficiency of thermal plants for combined cycle urban solid waste (waste) - Google Patents
system for increasing the thermal efficiency of thermal plants for combined cycle urban solid waste (waste)Info
- Publication number
- BRPI0604713A BRPI0604713A BRPI0604713A BRPI0604713A BR PI0604713 A BRPI0604713 A BR PI0604713A BR PI0604713 A BRPI0604713 A BR PI0604713A BR PI0604713 A BRPI0604713 A BR PI0604713A
- Authority
- BR
- Brazil
- Prior art keywords
- waste
- gases
- thermal
- steam
- increasing
- Prior art date
Links
Abstract
SISTEMA PARA AUMENTO DA EFICIêNCIA TéRMICA DE USINAS TERMELéTRICAS A RESìDUOS SóLIDOS URBANOS (LIXO) DE CICLO COMBINADO. Trata-se da adoção de um sistema de ciclo combinado consorciando-se turbinas ou motores a gás natural, ou similar, com turbinas a vapor gerado em caldeiras de recuperação alimentadas tanto pelos gases de escape dos motores ou turbinas como pelos resultantes da combustão dos resíduos (lixo). O sistema tem dois objetivos: aumentar a eficiência energética das usinas termelétricas a resíduos sólidos e/ou biomassa e evitar a corrosão nas caldeiras a vapor causada pelas altas temperaturas associadas aos ácidos corrosivos presentes nos gases da combustão dos resíduos. A corrosão que normalmente ocorre nos superaquecedores é evitada através do uso dos gases de exaustão limpos provenientes de motores ou turbinas a gás natural. Isto permite superaquecer o vapor a temperaturas muito mais elevadas do que seria possível com os gases sujos da combustão do lixo o que também aumenta o rendimento termodinâmico do ciclo de vapor e, por conseguinte da usina. Outro ponto onde acorre intensa corrosão em usinas lixo/energia é nas paredes de água em caldeiras no interior dos incineradores devido à proximidade da chama onde as temperaturas ultrapassam os 1.000<198>C e os gases estão à baixa velocidade, devido ao requisito de 2 segundos acima de 850<198>C para eliminação dos poluentes, sendo necessário proteger os tubos com películas de inconel além de refratários na região inferior do forno. Na patente solicitada a caldeira foi removida do forno e o evaporador recebe calor da mistura dos gases do incinerador com os gases provenientes dos superaquecedores resultando em uma temperatura máxima em torno de 700<198>C dos gases na região do evaporador, além da diluição das impurezas o que reduz ainda mais o potencial corrosivo. Como no interior dos tubos o vapor está saturado o metal está praticamente na mesma temperatura da água devido ao elevado coeficiente de convecção térmica característico do escoamento bifásico. A redução da temperatura dos gases assim como o aumento da sua velocidade, uma vez que os poluentes do lixo já foram destruídos no incinerador, permitir elevar a pressão do vapor com conseqüente aumento da eficiência mesmo com o uso de materiais convencionais no evaporador. A diluição das impurezas nos gases de combustão ocorre naturalmente como decorrência do processo.SYSTEM FOR INCREASING THE THERMAL EFFICIENCY OF COMBINED CYCLE URBAN SOLID WASTE (WASTE). It is the adoption of a combined cycle system combining turbines or natural gas engines, or the like, with steam turbines generated in recovery boilers fed by both engine and turbine exhaust gases and those resulting from combustion of waste. (trash). The system has two objectives: to increase the energy efficiency of thermal power plants to solid waste and / or biomass and to prevent corrosion in steam boilers caused by the high temperatures associated with corrosive acids present in the waste combustion gases. Corrosion that normally occurs in superheaters is prevented through the use of clean exhaust gases from natural gas engines or turbines. This allows the steam to overheat to much higher temperatures than would be possible with the dirty waste combustion gases which also increases the thermodynamic efficiency of the steam cycle and therefore of the plant. Another point where intense corrosion occurs in waste / power plants is on the boiler water walls inside the incinerators due to the proximity of the flame where temperatures exceed 1,000 <198> C and the gases are at low speed due to the requirement of 2 seconds above 850 <198> C for pollutant elimination, and the tubes must be protected with inconel and refractory films in the lower oven region. In the patent application the boiler was removed from the furnace and the evaporator receives heat from the mixture of the incinerator gases and the gases from the superheaters resulting in a maximum temperature around 700 <198> C of the gases in the evaporator region, in addition to the dilution of impurities which further reduces the corrosive potential. As the vapor inside the pipes is saturated the metal is practically at the same temperature as the water due to the high thermal convection coefficient characteristic of the biphasic flow. Reducing the temperature of the gases as well as increasing their speed, since the pollutants of the waste have already been destroyed in the incinerator, allowing to raise the vapor pressure with consequent increase of efficiency even with the use of conventional materials in the evaporator. Dilution of impurities in flue gases occurs naturally as a result of the process.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0604713 BRPI0604713A (en) | 2006-08-31 | 2006-08-31 | system for increasing the thermal efficiency of thermal plants for combined cycle urban solid waste (waste) |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BRPI0604713 BRPI0604713A (en) | 2006-08-31 | 2006-08-31 | system for increasing the thermal efficiency of thermal plants for combined cycle urban solid waste (waste) |
Publications (1)
Publication Number | Publication Date |
---|---|
BRPI0604713A true BRPI0604713A (en) | 2008-04-22 |
Family
ID=39309874
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BRPI0604713 BRPI0604713A (en) | 2006-08-31 | 2006-08-31 | system for increasing the thermal efficiency of thermal plants for combined cycle urban solid waste (waste) |
Country Status (1)
Country | Link |
---|---|
BR (1) | BRPI0604713A (en) |
-
2006
- 2006-08-31 BR BRPI0604713 patent/BRPI0604713A/en not_active Application Discontinuation
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
B11A | Dismissal acc. art.33 of ipl - examination not requested within 36 months of filing | ||
B11Y | Definitive dismissal acc. article 33 of ipl - extension of time limit for request of examination expired |