Chlorination plant adalah sistem yang mengubah air laut menjadi larutan chlorine. Chlorine berfungsi untuk mencegah mikroorganisme berkembang biak dengan cara melumpuhkan sementara biota laut yang dapat menimbulkan gangguan fungsi pendingin seperti kondensor maupun heat exchanger. Berdasaran PERMENLHK SK.719/Menlhk/Setjen/PKL.1/9/2019 residual chlorine yang diizinkan dalam siklus air pendingin sesuai Baku Mutu Lingkungan berkisar antara 0,2-0,5 ppm. Air laut diubah melalui proses elektrolisis dibantu injeksi arus listrik searah dari trafo rectifier. Kondisi trafo rectifier chlorination plant telah terjadi 54 kali gangguan, sehingga arus rectifier dibatasi 4000 A. Penelitian ini bertujuan untuk menganalisa efisiensi produksi chlorination plant PLTU Labuan berdasarkan kapasitas produksi chlorine saat commissioning yaitu sebesar 111,695 kg/h. Variabel yang diuji, yaitu arus rectifier, flow air laut, tegangan cell, konsentrasi chlorine, dan residual chlorine. Variabel kemudian diolah dan dianalisa untuk mendapatkan perhitungan kapasitas produksi chlorine, specific energy consumption dan efisiensi chlorination plant. Berdasarkan analisa hasil pengujian, didapatkan nilai efisiensi chlorination plant maksimum pada arus kerja 4000A dengan nilai 59,1%. Selain itu didapatkan nilai residual chlorine tertinggi pada arus output rectifier 4000 A dengan nilai 0,24 ppm. Dari hasil pengujian, chlorination plant PLTU Labuan direkomendasikan untuk beroperasi pada arus kerja 3500 A sampai dengan 4000 A sesuai dengan analisa yang telah dilakukan.

Chlorination plant is a system that converts seawater into a chlorine solution. Chlorine functions to prevent microorganisms from multiplying by temporarily paralyzing marine biota that can cause disturbances in cooling functions such as condensers and heat exchangers. Based on PERMENLHK SK.719/Menlhk/Setjen/PKL.1/9/2019 the allowed residual chlorine in the cooling water cycle according to the Environmental Quality Standards ranges from 0.2-0.5 ppm. Sea water is converted through an electrolysis process assisted by direct electric current injection from the rectifier transformer. The condition of the chlorination plant rectifier transformer has occurred 54 times, so the rectifier current is limited to 4000 amperes. This study aims to analyze the production efficiency of the chlorination plant of PLTU Labuan based on the chlorine production capacity during commissioning, which is 111,695 kg/h. Variables tested, namely rectifier current, seawater flow, cell voltage, chlorine concentration, and residual chlorine. The variables are then processed and analyzed to get the calculation of chlorine production, specific energy consumption and efficiency of chlorination plant. Based on the analysis of the test results, the maximum efficiency of the chlorination plant was obtained at 4000A working current with a value of 59.1%. In addition, the highest residual chlorine value was obtained at the 4000 A rectifier output current with a value of 0.24 ppm. From the test results, the chlorination plant of PLTU Labuan is recommended to operate at a working current of 3500 amperes to 4000 amperes according to the analysis that has been done.