Моделирование процесса газификации эффлюента темновой ферментации в газогенераторе с нисходящим потоком

В работе представлены результаты исследования численного моделирования процесса газификации в газогенераторе с нисходящим потоком для получения синтез - газа с высоким содержанием водорода. Впервые исследована возможность применения эффлюента темновой ферментации в качестве сырья для термохимической конверсии с использованием в качестве окислителя - воздуха в соотношениях окислитель/топливо 0,45, 0,55 и 0,65. Моделирование процесса газификации осуществлялось в программном комплексе Comsol Multiphysics. В результате численных исследований были получены значения концентраций основных компонентов синтез - газа. Выход синтез - газа при воздушной газификации составил 1,8 м³/кг сухого вещества. При этом теплота сгорания генерируемого газа варьируется от 3,1 до 3,9 МДж/м³ при молярном отношении водорода к углекислому газу, находящемся в диапазоне от 3,1 до 3,9. Максимальный удельный вес водорода в составе синтез - газа, равный 26,94 %, достигается при соотношении окислитель/топливо, равном 0,45. Эффективность получения водорода варьируется в диапазоне от 23,8 до 27,3 %. Тепловая мощность, которую можно получить из синтез – газа, соответствует 47 – 59 кВт. Эффективность преобразования углерода составляет 23,6 – 28,8 %. На основании конструкционного расчета были получены основные геометрические параметры газогенератора с нисходящим потоком. Газогенератор предназначен для получения синтез - газов из эффлюентов анаэробной ферментации. Получение требуемых значений концентраций необходимых компонентов газа будет осуществляться путем варьирования расхода газифицирующего агента, а также комбинирования соотношений окислитель/топливо. Данное исследование позволит расширить знания в области комплексных технологий получения водорода из органических отходов, сочетающих биологические и термохимические методы.

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