The behavior of silica in geothermal brine from Dieng geothermal power plant, Indonesia

Pambudi, Nugroho Agung; Itoi, Ryuichi; Yamashiro, Rie; Alam, Boy Yoseph Css Syah; Tusara, Loren; Jalilinasrabady, Saeid; Jaelani, Khasani

doi:10.1016/j.geothermics.2014.12.003

Cited by 37 publications

(18 citation statements)

References 4 publications

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“…Sumber tenaga panas bumi Dieng yang berada di Jawa tengah memiliki permasalahan dengan pengendapan silika (silica scaling). Konsentrasi silika yang terlarut dalam fluida geothermal (brine) terbilang tinggi sebesar 1400 mg/L [2,7]. Sejumlah pipa tersumbat oleh endapan silika sehinga tidak diinjeksikan kembali melalui sumur injeksi namun ketika diinjeksikan silica tersebut dapat menutupi rekahan-rekahan perut bumi dapat mengalirkan fluida kerja yang mengganggu kinerja pembangkit dan menurunkan daya listrik yang dihasilkan.…”

Section: Pendahuluanunclassified

“…Efek dari silica scaling mengganggu proses pemanfaatan energi geothemal pada pipelines, turbin dan sumur injeksi yang mengakibatkan berkurangnya diameter pipa, sehingga mengurangi laju aliran fluida seperti yang ditunjukkan pada Gambar 1a [5]. Konsentrasi silika terlarut di Dieng Jawa Tengah mencapai 1400 mg/L pada rentang temperatur 76 0 C sampai 89 0 C dengan pH rentang 3,20 sampai 3,25 [7].…”

Section: Pendahuluanunclassified

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Eksperimen Pengkondisian Brine di Lingkungan Basa pada Skala Lab Untuk Pencegahan Silica Scaling di Sumur Injeksi Pada Kolam Penampungan di PLTP Dieng Jawa Tengah

Mulyana¹

2018

JIIF

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Abstrak. Pembangkit Listrik Tenaga Panas Bumi (PLTP) berdominasi air di Dieng memiliki permasalahan dengan pengendapan silika (silica scaling), yang terjadi ketika brine keluar dari separator untuk diinjeksikan kembali ke perut bumi. Endapan silika menyumbat rekahan batuan tempat jalur lewatnya air, akibatnya kebutuhan debit air sumber panas bumi terganggu. Konsentrasi silika terlarut dalam brine di PLTP Dieng 1400 mg/L, ketika terjadi penengendapan silika kinerja PLTP terganggu ditandai dengan menurunnya daya pembangkit yang dihasilkan. Penanggulangan yang selama ini dilakukan adalah menampung terlebih dahulu brine di kolam penampungan, membiarkannya untuk beberapa lama agar silikanya mengendap baru di injeksikan ke perut bumi. Tulisan ini melaporkan hasil penelitian perlakuan terhadap sampel brine yang diambil dari lapangan di PLTP Dieng dalam keadaan basa yang dilakukan di laboratorium. Tujuannya adalah mendapatkan pada kondisi pH berapa silika akan efektip mengendap yang kemudian kelarutannya tetap stabil. Selain itu dicari jenis inhibitor basa apa yang terbilang efektip untuk perlakuan ini. Langkah eksperimen yang dilakukan adalah mengambil sampel brine yang berada di Dieng. Pertama dilakukan pembuatan larutan kerja dari hasil pengenceran natrium metasilika yang diperlukan untuk pembuatan kurva standar absorbansi terhadap konsentrasi silika terlarut. Selanjutnya dilakukan pembuatan sampel brine dengan beberapa pengenceran dan diuji kandungan silika terlarutnya. Langkah berikutnya dilakukan pengkondisian lingkungan basa untuk brine yaitu dengan menambahkan basa kuat NaOH dan KOH untuk beberapa nilai pH. Selanjutnya diukur kembali sifat kelarutan silikanya sebagai fungsi waktu. kemudian dilakukan pengujian dengan larutan reagen molibdosilikat, larutan HCl dan larutan asam oksalat. Konsentrasi silika d dalam sampel birne diperoleh melalui pengukuran absorbansi dengan menggunakan spektrofotometer UV/Vis pada panjang gelombang 410 nm. Berdasarkan hasil penelitian konsentrasi silika yang dalam brine yang keluar dari separator berkisar antara 1312,42 mg/L -1330,89 mg/L. Kemudian dari hasil pengkondisian lingkungan basa di pH 9, NaOH dapat menurunkan konsentrasi silika 49,12 %, sedangkan pengkondisian lingkungan basa dengan KOH di nilai pH 9,5 dapat menurunkan konsentrasi silika 18,84 %.Kata kunci : Brine, Silica Scaling, Absorbansi, Konsentrasi Silica, Molibdosilikat Abstract. Geothermal power plants (PLTP) in Dieng are having the problems of silica deposition (silica scaling), which occurs when the brine comes out from the separator and get injected back to earth. Silica precipitates clog the rocks fracture in the path passed by the water, resulting in the lack of water debit needed to discharge the geothermal sources. The concentration of dissolved silica in the brine of PLTP Dieng is 1400 mg / L, silica scaling would disturb the performance of the powerplant, as indicated by the decreasing generated power. Countermeasures that have been done is to temporarily collect the brine in a storage pond to let the silic...

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Section: Pendahuluanunclassified

Eksperimen Pengkondisian Brine di Lingkungan Basa pada Skala Lab Untuk Pencegahan Silica Scaling di Sumur Injeksi Pada Kolam Penampungan di PLTP Dieng Jawa Tengah

Mulyana¹

2018

JIIF

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“…The constraint on direct use of geothermal energy is that flowing geothermal fluids must be with the help of a pump or flow due to differences in the height of the land so electricity must be available or differences in ground height. The use of pumps and production pipes is also susceptible to scaling and corrosion because geothermal fluids have high silica content and corrosion properties [5][6][7] . The use of a heat pipe to extract geothermal energy without flowing its fluid is one solution.…”

Section: Introductionmentioning

confidence: 99%

Study of Heat Pipe Utilizing Low-Temperature Geothermal Energy and Zeolite-A for Tea Leaves Withering Process

Gunawan

Putra²,

Kusrini³

et al. 2020

Evergreen

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Conventional drying methods can be improved by utilizing geothermal energy and the addition of Zeolite-A as an absorbent from the synthesis of Kaolin, which has abundant resources in Indonesia. The use of geothermal energy for fossil energy substitution results in the development of more sustainable and safer environmentally, while the use of Kaolin as absorbent will increase economic value and reduce the export of raw materials in Indonesia. This research was conducted to study the effect of adding Zeolite-A to the heat pipe heat exchanger (HPHE) system that utilizes geothermal energy to the performance of tea withering. As a source of geothermal fluid, a water heater with a capacity of 9000 Watts and hot water flowed with a pump were used. The HPHE used was constructed of 42 pcs of heat pipes and 181 pcs of the fin. The heat pipe used had a length of 700 mm with an outer diameter of 10 mm, the fluid worked in the heat pipe using water with a filling ratio of 50%.The fin was made of aluminum with a thickness of 0.105 mm with a size of 76 x 345 mm. The results showed that the effectiveness of HPHE varied from 64.825% to 78.363%. The Henderson and Pabis model was the best model to represent the behavior of tea leaves using Zeolite-A, and the Page model for the withering of tea leaves without Zeolite-A. With the addition of Zeolite-A, the speed of tea leaves withering increased by about 18%. In addition to being environmentally friendly, the use of geothermal energy can be an alternative energy substitution for drying tea that uses firewood which is harmful to health because it becomes the source of anthraquinone (AQ) as a cause of cancer in humans.

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“…Scale formation increases oil production costs and in some cases results to the abandonment of the respective wells, often containing still large amounts of entrapped oil . In geothermal fields, where high levels of silica and other dissolved salts are present, scaling problems are encountered in pipes and geothermal fluid handling equipment . CO 2 injection, often employed as an antiscaling process and long‐term brine flow in oil reservoirs are seriously affected by salt precipitation .…”

Section: Introductionmentioning

confidence: 99%

Precipitation of sparingly soluble salts in packed sandbeds in the presence of miscible and immiscible organic substances

Pavlakou

Sygouni

Lioliou

et al. 2016

Crystal Research and Technology

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Sparingly soluble salts precipitation, e.g. calcium carbonate or calcium sulfate, results in pore clogging in rock formations and in the concomitant reduction of the local permeability of oil wells during the oil extraction processes. On the other hand, in situ controlled salt precipitation is desirable in various applications e.g. waterproofing of concrete constructions suffering from leakages, etc. In the present study, calcium carbonate (CaCO 3 ) precipitation in sandbeds was investigated, in the presence of organic solvents simulating the conditions prevalent in oil-well zones. CaCO 3 precipitation was investigated from supersaturated solutions prepared by in-situ mixing of NaHCO 3 and CaCl 2 .2H 2 O solutions before the inlet of sandbeds. The solution resulting from the mixing of the two solutions was supersaturated with respect to all calcium carbonate polymorphs. Three types of experiments were performed depending on the supersaturated solutions: a) aqueous solutions b) aqueous supersaturated solutions in contact with sandbeds presaturated with n-dodecane c) aqueous solutions containing monoethylene glycol (MEG). Results showed that oil-water interfaces enhanced the heterogeneity of the supersaturated solutions and accelerated crystal growth of calcium carbonate at the inlet of the sandbed, resulting in early pore clogging and limitation of local permeability. Maximum sandbed consolidation was obtained with the solutions containing MEG.

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The behavior of silica in geothermal brine from Dieng geothermal power plant, Indonesia

Cited by 37 publications

References 4 publications

Eksperimen Pengkondisian Brine di Lingkungan Basa pada Skala Lab Untuk Pencegahan Silica Scaling di Sumur Injeksi Pada Kolam Penampungan di PLTP Dieng Jawa Tengah

Eksperimen Pengkondisian Brine di Lingkungan Basa pada Skala Lab Untuk Pencegahan Silica Scaling di Sumur Injeksi Pada Kolam Penampungan di PLTP Dieng Jawa Tengah

Study of Heat Pipe Utilizing Low-Temperature Geothermal Energy and Zeolite-A for Tea Leaves Withering Process

Precipitation of sparingly soluble salts in packed sandbeds in the presence of miscible and immiscible organic substances

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