Which has higher thermal efficiency, water tube boiler or fire tube boiler?

Fire tube boilers are characterized by a simple structure and low material requirements. This type of boiler has an upper limit of 25 atmospheres. Water tube boilers have no upper limit. The design and materials change a little, and it will be a little. a step forward. It's not as good as supercritical or ultra-supercritical. 300 MPa has not reached the peak, and there is still a lot of potential to be exploited. As for the smoke tube, no matter how big you make it, he has it. a pressure of 25 atmospheres (one MPa is equivalent to ten atmospheres). These are their attributes and have nothing to do with thermal efficiency, as they have double return passes, they can also reach 98% to 99% in three return passes. The thermal efficiency of four-pass internal circulation is similar (the difference is the number of tons of gas produced per hour). Even if it is a single pass, the heating cocommunity will generally be eliminated. The gas production volume of the water tube. The boilers are smaller than those of the smoke tubes. If we take a domestic water heater as an analogy, an electric water storage water heater can be regarded as (a smoke tube, an electrode heating tube, one uses fire and the other uses electricity according to a similar principle), a gas water heater (an analogy is a water pipe), You can compare the volumes If the energy consumption is similar, the water pipes need to heat up quickly