Blast furnace gas dry dust removal apparatus

A blast furnace gas dry dedusting device comprises a heat pipe heat exchanger, a dedusting box with a purified gas outlet and a fly ash outlet, an ash bin, a counter blowing fan, a purified gas main pipe and an ash conveying main pipe, the heat pipe heat exchanger is connected with the dedusting box, the purified gas outlet is connected with the purified gas main pipe, the blast furnace gas dry dedusting device is characterized in that: a filtering electric butterfly valve is arranged between the purified gas main pipe and the purified gas outlet; an inlet of the counter blowing fan is connected with the purified gas main pipe, an outlet is connected with a counter blowing purified gas main pipe, the purified gas outlet is connected with the counter blowing purified gas main pipe by a counter blowing electric butterfly valve, and the fly ash outlet is connected with the ash conveying main pipe through a reverse insertion valve, a rotary valve, a dome valve, an ash conveying pump and the dome valve. A cylinder