Sectional boiler with fire tube for preparing acid by sulphur

A drum sectional sulfur acid-manufacturing fire tube boiler includes a steam dome, a water drum, smoke tube, a smoke box, a steam riser and a down-comer. The utility model is characterized in that the water drum is divided into a high-temperature drum and a low-temperature drum and the two drums are connected by the smoke box; the other end of the high-temperature drum is connected with a front tube sheet and an inlet smoke box; the front sheet is coated with a protection tube sheet made of fire-resistant materials and the inlet smoke box is disposed with supports for the smoke box on both sides and the supports are anchored on the floor by foundation bolts; the other end of the low-temperature drum is connected with a back tube sheet and an outlet smoke box; a common steam dome is disposed above the high-temperature and low-temperature drums; each drum is disposed with a steam riser and a down comer connected with the steam dome and the lower end of each drum is disposed with drum supports on both sides; the diameter of the high-temperature drum is larger than that of the low-temperature drum, and the wall thickness of the high-temperature drum is thicker than that of the low-temperature drum; each drum is disposed with a smoke tube and each smoke tube is fixed on the tube sheet of each drum.