ANALISIS NILAI KALOR DAN LAJU PEMBAKARAN BRIKET TONGKOL JAGUNG SEBAGAI SUMBER ENERGI ALTERNATIF

ABSTRAKTujuan dari penelitian ini yaitu untuk menghasilkan briket tongkol jagung sebagai alternative sumber energi yang memiliki nilai kalor yang tinggi. Briket tongkol jagung dibuat dari tongkol jagung yang sudah dikeringkan dan dihaluskan sebelumnya dengan ukuran 20 mesh. Masing-masing perlakuan dicetak dengan variasi persentase perekat tepung tapioka yaitu 5%, 10%, dan 15%. Selain variasi perekat dilakukan juga variasi tekanan pembentukannya untuk melihat komposisi terbaik yang menghasilkan nilai kalor yang tinggi dan laju pembakaran yang sesuai. Briket selanjutnya diuji nilai kalor dan laju pembakarannya dengan menggunakan alat bom calorimeter. Hasil penelitian menunjukkan bahwa secara berturut-turut nilai kalor dan laju pembakaran briket dengan persentase komposisi perekat 5%, 10%, 15% yaitu 21,00 kJ, 22,68 kJ, 31,08 kJ, dan 12,00 gram/menit, 13,33 gram/menit, 13,50 gram/menit. Hasil terbaik dihasilkan pada komposisi persentase perekat 15% dengan nilai kalor mencapai 31,08 kJ, dan laju pembakaran 13,50 gram/menit yang tidak terlalu jauh meningkat dibandingkan dengan komposisi persentase perekat lainnya. Kata kunci: briket; tongkol jagung; nilai kalor; laju pembakaran ABSTRACTThe purpose of this research is to produce corn cobs briquettes as an alternative energy source that has a high calorific value. Corn cobs briquettes are made from corn cobs that have been dried and previously mashed with a size of 20 mesh. Each treatment was printed with variations in the percentage of tapioca starch adhesive, namely 5%, 10%, and 15%. In addition to variations of the adhesive, variations in the formation pressure were also carried out to see the best composition that produced a high heating value and an appropriate combustion rate. The briquettes were then tested for calorific value and rate of combustion using a bomb calorimeter. The results showed that the calorific value and burning rate of briquettes with the percentage of adhesive composition 5%, 10%, 15%, were 21.00 kJ, 22.68 kJ, 31.08 kJ, and 12.00 gram/minute, respectively. 13.33 grams/minute, 13.50 grams/minute. The best results were obtained at 15% adhesive percentage composition with a calorific value of 31.08 kJ, and a burning rate of 13.50 gram/minute which was not significantly increased compared to other adhesive percentage compositions. Keywords: briquettes; corn cobs; calorific value; combustion rate

Incineration as a Means of CO2 Reduction

Incineration is a method of waste management, which is quickly taking a prominent role in munic ipa l authorities all over the world. The introduction of smokeless incinerators aids in decreasing adverse environmental impacts, making this technology a viable alternative to landfills. Modern designs and advancements in incineration processes focus on enhancements in energy efficiency and reductions in emissions of CO2, thus creating an avenue for sustainable energy. It is a means to combat organic substances in waste and separate dangerous gases and particulates from flue gas. Modern incinerators have efficient emission control systems that use multiple techniques for the elimination, at source, of potentially hazardous emissions and automatically control the rate of combustion. Smokeless combustion can be achieved through a combination of temperature, time and turbulence. The range of test incinerators used for this study covers a broad spectrum of usage reduces munic ipa l solid waste to a mere 0.3% of its original state. Reductions in CO2 are directly correlated to decreases in the amount of waste to be transported to off-site landfills, thus reducing the number of trips to and from same. Such reductions are in tandem with the goal of carbon neutrality, or rather, carbon net-zero, which requires the sequestration of an equal amount of CO2 produced. Comparisons are provided for reductions of CO2 as a result of the reduction in the burning of diesel by backload refuse trucks. Case studies are presented for communities with a significant general waste generation where CO2 emission from the waste pickup and transport to and from landfills are compared to that of CO2 emissions after the installation of a smokeless incinerator unit in a central community area. The most significant finding is that CO2 emissions are reduced by approximately 50% in most cases, with the introduction of these units. The introduction of these smokeless incinerator units can combat waste management woes in a shorter space of time, in parallel with achieving environmental targets such as that of Carbon Neutrality.

Environmental Governance through the Utilization of Waste Methane Gas into Renewable Energy

The purpose of this article is to examine the conversion of waste methane gas to renewable energy through environmental management. Processing organic waste is one kind of alternative energy that may be generated and regenerated. Garbage is a major issue for the majority of people, particularly the vast volume of market garbage. Waste processing and utilization technology is required. Implementing the 3R process of reduce, reuse, and recycle on fresh garbage not only generates useful goods, but also addresses the waste issue and generates revenue for those who wish to manage it. As a result, it is critical to evaluate the design of organic waste burners that convert methane gas to methane and to estimate the rate of combustion and heat produced by organic waste biogas

Reducing the intensity of thermal radiation at the sublayer extinguishing of alcohols by ecologically acceptable aerosols

This paper has theoretically substantiated and experimentally established the intensity of thermal radiation at burning and sublayer extinguishing of alcohols with environmentally acceptable aerosols. An installation has been improved that determines the effectiveness of sublayer extinguishing with fire-extinguishing aerosols; a procedure that has been devised for determining the intensity of thermal radiation implies equipping it with an additional heat flow meter HFM–01 at a distance of 30 and 60 mm. The task to establish the intensity of thermal radiation when burning alcohols and its impact on the process of sublayer extinguishing of alcohols with aerosols has been solved. The dependence of sublayer extinguishing efficiency on thermal radiation implies that the fire extinguishing aerosol completely shields the surface of the combustible liquid against its action. The result of this study has established that the intensity of thermal radiation at a distance of 60 and 30 mm from the surface of an alcohol flame with an area of 234 cm2 ranges from 0.8 to 4.7 kW/m2; the intensity of burning and, accordingly, radiation, maximizes on seconds 30‒40 of burning. It has been found that the intensity of thermal radiation for ethanol decreases with the addition of an aerosol with an intensity of up to 0.2 g/s, and decreases even more at the intensity of supply from 1.2 g/s. With a further increase in the intensity of aerosol supply, the radiation intensity begins to decrease, probably due to a decrease in the rate of combustion. In this case, the flame first decreases in size up to 2 times, and then, after 2‒3 seconds, it goes out. The use of fire-extinguishing aerosol for the sublayer extinguishing of alcohols ensures the effect of several factors that synergize and reduce the intensity of evaporation, burning, and, accordingly, thermal radiation

Воспламенение топливной смеси с помощью многоточечного импульсного искрового разряда при различных начальных условиях

The development of efficient and reliable systems for the ignition of air/fuel mixtures is of interest for many practical applications associated with the use of combustion devices. To increase the total surface of the flame, ensure the reliability of ignition, increase the rate of combustion in the volume of the chamber and the completeness of combustion of the combustible mixture, multi-point ignition of the air/fuel mixture using several pulsed spark discharges is used. A comparison of the characteristics of combustion products in the working chamber when using different numbers of igniting spark discharges is made based on the data of a physical experiment. Measurements are carried out at various ignition points of the mixture, initial mixture pressures, and air/fuel ratios. The values of the air/fuel ratio used in the experiment are in the range, the boundaries of which are the lower and upper concentration limits of the ignition of the propane-air mixture.

A priori estimates of the mass of the burnt materials in rooms of buildings in the integral mathematical model of the initial stage of the fire

The integral mathematical model of the initial stage of a fire in the premises of buildings focuses on the problem of estimating the mass of burnt materials assuming that the data on the rate of combustion of combustible materials are not complete. A priori estimates of the mass of burnt materials are found, which do not use data on the combustible material combustion rate. To derive these estimates, a special representation of the modulus of the increment (fall) of oxygen density in a room with a fire in the initial stage was preliminarily found. Two approaches to the derivation of a priori estimates of the mass of burnt materials have been implemented - using the upper and lower estimates of the modulus of the increment (fall) of the oxygen density. A comparison of a priori estimates obtained with different approaches is performed. Research can be useful at assessment of ecological situation and consequences of the fire.

The Effect of the Type and Composition of the Adhesive on the Physical Properties and the Rate of Combustion Hyacinth Biobriquettes

This study aimed to identify the effects of variety and composition of the adhesive used to the physical properties and the rate of combustion hyacinth biobriquettes. The physical properties referred to are water content, density and heating value. This research is an experimental study with a literacy study conducted in 3 stages, preparing tools and materials, making biobriquettes, and testing biobriquettes. The main ingredients used in the manufacture of biobriquettes are water hyacinth which is obtained at the Batujai Dam, Central Lombok Regency and the adhesive materials used are wheat flour, tapioca flour and cement. The method used to test the water content and density of the biobriquette was oven, while the calorific value and the rate of combustion were by heating water from the biobriquette combustion. The results showed that the biobriquette water content ranged from 5.138% - 13.953%, density 0.412 g/cm3 - 0.513 g/cm3, calorific value 2984.520 cal - 4476.780 cal, and combustion rate 0.029543 g/s - 0.042431 g/s. Based on the test results, it is known that the addition of adhesive material causes the water content, density, and combustion rate of the biobriquette to increase but the calorific value tends to decrease.

UJI LAJU PEMBAKARAN DAN NILAI KALOR BRIKET WAFER SEKAM PADI DENGAN VARIASI TEKANAN

ABSTRAKPenelitian ini bertujuan untuk mengetahui laju pembakaran dan nilai kalor briket wafer sekam padi dengan variasi tekanan. Proses pembuatannya dengan menggunakan alat tekan briket, bahan yang digunanakan yaitu sekam padi dan tepung kanji. Hasil densitas briket wafer sekam padi dengan variasi tekanan secara berurut 20 PSI yaitu sebesar 0,453 g/cm3, 30 PSI yaitu sebesar 0,467 g/cm3, dan 40 PSI yaitu sebesar 0,500 g/cm3. Nilai kalor briket wafer sekam padi dengan variasi tekanan secara berurut 20 PSI yaitu sebesar 4.793,94 kalori, 30 PSI yaitu sebesar 5.137,64 kalori, 40 PSI yaitu sebesar 5.266,52 kalori. Kadar air yang dihasilkan dengan variasi tekana secara berurut 20 PSI yaitu sebesar 6,45 %, 30 PSI yaitu sebesar 6,40 %, 40 PSI yaitu sebesar 5,65 %. Nilai laju pembakaran briket wafer sekam padi secara berurut 20 PSI yaitu sebesar 2,2212 gram/menit, 30 PSI yaitu sebesar 2,2878 gram/menit, 40 PSI yaitu sesar 2,4363 gram/menit. Dapat disimpulkan bahwa semakin besar tekanan maka nilai kalor dan laju pembakaran dari briket wafer sekam padi akan semakin meningkat. Kata kunci: sekam padi, briket, nilai kalor, laju pembakaran. ABSTRACTThis study aims to determine the combustion rate and heating value of rice husk wafer briquettes with variations in pressure. The manufacturing process uses briquette press, the ingredients used are rice husk and starch. The results of the density of rice husk wafer briquettes with a sequence of 20 PSI pressure variations in the amount of 0.453 g/cm3, 30 PSI in the amount of 0.467 g/cm3, and 40 PSI in the amount of 0.500 g/cm3. The calorie value of rice husk wafer briquettes with a variety of sequential pressure variations of 20 PSI is 4,793.94 calories, 30 PSI is 5,137.64 calories, 40 PSI is 5,266.52 calories. The resulting water content with a variety of pressures in sequence 20 PSI is 6.45%, 30 PSI is 6.40 %, 40 PSI is 5.65%. The value of the rate of burning of rice husk wafer briquettes in sequence of 20 PSI is 2.22212 grams / minute, 30 PSI is 2.22878 grams / minute, 40 PSI is 2.4363 grams / minute fault. It can be concluded that the greater the pressure, the calorific value and the rate of combustion of rice husk wafer briquettes will increase. Keywords: rice husk, briquettes, heating value, rate of increase.

Percentage Analysis Mixed of CPO, Phosphic Acid and Sodium Hydroxide as a Replacement for Diesel Engine Oil Fuel Using a Calorize Test

One of the researches being developed is to produce methyl esters from CPO through transesterification reaction of vegetable oil (triglycerides) with methanol. Biodiesel from crude palm oil is a new hope for answering some of the energy needs. know the rate of combustion of the biodiesel produced. Biodiesel that is produced from a mixture of CPO, phosphoric acid and sodium hydroxide, with a percentage of I. 98% CPO, 1% Phosphoric Acid, 1% Sodium Hydroxide: II. 95% CPO, 2% Phosphoric Acid, 3% Sodium Hydroxide: III. 95% CPO, 3% Phosphoric Acid, 2% Sodium Hydroxide. The results showed that the most effective mixture was 95% CPO, 3% acid phosphate and 2% sodium hydroxide with a burning rate of 0.309 g / minute in 30.42 minutes with a final temperature of 57 (oC).