public string GetCoalConsumptionAlarmSettingsWithTreeGridFormat(int productLineId)
        {
            DataTable  dt             = EnergyConsumptionService.GetCoalConsumptionAlarmSettingsByFactoryId(productLineId);
            DataColumn parentIdColumn = new DataColumn("ParentID");

            dt.Columns.Add(parentIdColumn);

            foreach (DataRow row in dt.Rows)
            {
                row["ParentID"] = "";
            }

            return(TreeGridJsonParser.DataTableToJson(dt, "Name", "ParentID", "StandardValue", "AlarmValue"));
        }