Boiler accessories vary by type. Taking an oil-gas fired steam boiler as an example, its auxiliary accessories include chimneys, gas separators, feed water pumps, computer control cabinets, daily oil tanks, automatic water treatment systems, oil and gas burners, valves, and instruments. For a coal-fired steam boiler, the auxiliary accessories include speed regulators, blowers, induced draft fans, chimneys, flues, membrane tanks, filter separators, water separators, computer control cabinets, dust collectors, gas collectors, and coal feeders. The auxiliary components of an oil-gas organic heat carrier boiler include oil auxiliary equipment, gas auxiliary equipment, valves, instruments, circulating oil pumps, gear oil injection pumps, filters, oil-gas separators, chimneys, computer control cabinets, expansion tanks, oil storage tanks, oil burners, and gas burners. The auxiliary equipment of a hot air boiler includes speed regulators, high-pressure blowers, induced draft fans, computer control cabinets, chimneys, flues, slag discharge machines, coal feeders, and heat exchangers.