surface sets a division wall 18 is arranged between the two sets of convection heating surfaces and a flue gas damper 15 is arranged behind the division wall 18 the hearth 4 is enclosed by the water cooled wall 3 which is a water cooled wall with spiral pipe coils a rifled vertical pipe water cooled wall and a normal vertical pipe water cooled wall or the combination of any two of them besides the overall flowing direction of water cooled working medium in the water cooled wall is from top to bottom or from bottom to top the middle uplink flue 14 is enclosed by a wall enclosure heating surface 7 or by a guard board a slag discharge machine 19 is arranged below the slag discharge opening 1 a first dust discharge opening 101 is formed at the bottom of the middle uplink flue 14 and a second dust discharge opening 102 is formed at the bottom of the tail downlink flue 22 as shown in fig5 the arrangement structure suitable for an inverted pulverized coal boiler with ultra high steam temperature steam parameters includes a hearth 4 at the bottom outlet of which a slag discharge opening 1 is formed a hearth flue gas outlet 201 is formed on the lower part of the side wall of the hearth 4 and is communicated with one end of the hearth outlet horizontal flue 12 while the other end of the hearth outlet horizontal flue 12 is communicated with a middle uplink flue 14 and the top of the middle uplink flue 14 is communicated with.