CS227922B1 - Steam boiler rear wall - Google Patents

Abstract

The invention relates to a steam boiler, which is provided with a connection of two steel gas-tight welded tube walls in the outlet of the flue gases from the steam boiler. The essence of the invention is that the tube walls of the evaporator are connected to the tube wall of the evaporator by means of the tubes of the evaporator, which, in the outlet of the flue gases from the steam boiler, fit into the recesses in the tube wall of the evaporator, formed by bending the tubes of the evaporator into the combustion chamber.

Description

227922 2

BACKGROUND OF THE INVENTION The present invention relates to steam boilers, in which two SaS sheets of metal-welded tubular walls are joined together. In "BOX" type steam boilers, it is advantageous to create an intermediate wall separating the combustion space from the second draft from the evaporator tubes welded to the all-metal gas-tight wall, which also creates the back wall of the combustion chamber and hence the lower Saxon wall of the steam boiler. . Furthermore, the solution to this problem is to solve the ceiling of the steam boiler and its upper part of the rear wall of the superheater tubes driven behind the boiler-like, as the first heat-transfer surface.

However, the two described solutions bring with them the problem of connecting the two Saw backs to the fact that, at the interface of the shields, the projecting grid is the outlet of the steam boiler. Several solutions are known to connect these Said rear walls.

Their common disadvantage is that they are not part of the boiler pressure unit, their heating and subsequent thermal expansion is not the same as the temperature and expansion of the sedimentation walls of the steam boiler. In this way, a great thermal stress is created at the wall of the wall seams of the suspension rods. Removal of these problems is only possible with costly direct spring hinges capable of releasing thermal dilatation.

The aforementioned drawbacks are eliminated by no wall of the steam boiler according to the invention, the principle of which is that the tubular wall of the evaporator steam wall is connected by means of superheated steams which, in the grid spacing for the steam boiler outlet, fit into the gap in the tubular wall the evaporator formed by bending the evaporator into the combustion chamber, these are guided parallel to the tubular wall of the evaporator and are inserted into the tubular wall of the inclined bottom of the second steam boiler stroke.

The connection of the tubes overheating the steam to the evaporator tubes in the all-metal gas-tight tube is transferred by flat rods and suitable molded sheets.

By joining the tubular wall to heat the steam with the tubular wall of the evaporator by means of a tubular superheater of steam of the same diameter, also forming a grid for the exhaust of the steam boiler, a smooth transfer of the weight of the bottom of the rear wall of the steam boiler is achieved. The pipes overheat the steam as the first heat exchange surface behind the boiler drum, have only a slight operating temperature, as the downstream walls of the pressure boilers of the steam boiler, and the overall safety and operational reliability of the construction node due to the low level of thermal stresses is at the desired level.

Improving the heat exchanger pipes with forged fittings results in significant material savings, altering the number of pipes in the boiler outlet for the flue gas from the steam boiler, as well as adjusting the appropriate pipe spacing so that the salt carrier tube, which must be straight, always fits into the evaporator wall spacing.

1 is a schematic representation of a " BOX " steam boiler with the designation of a flue gas outlet grid of a steam boiler and hence a grinder of the lower section of the rear wall of the steam boiler. FIG. 2 shows an "A" detail of the overheating connection of the evaporator tubes. FIG. 3 is a sectional view of section B-B of an evaporator wall with a welded-on tube.

The "BOX" type steam boiler is flanked by three evaporator walls, the fourth - rear wall is formed by the evaporator tubes 1 and the heating tube. A steam boiler ceiling is also formed from the steam heating pipes. The intermediate wall 4 is formed from the evaporator pipes X as a continuation of the lower rear wall of the steam boiler. The flue gases resulting from the combustion of the fuels in the combustion chamber 20 are guided by the first stage 6 and the second stage X the boilers in which the tubes of the heat transfer surfaces and the tubes of the heat transfer surfaces of the convection grilles are placed

Claims (3)

A steam boiler rear boom consisting of steam superheater tubes and evaporator tubes welded together with flat steel rods and shaped plates into a gas-tight gas-tight tubular wall, characterized in that the tubular superheater (12) with tubular wall (13) The evaporator is connected by tubes (14) of larger diameter steam superheater, which at the spacing of the exhaust gas outlet grate (10) fit into the gaps of the tube wall (13) of the evaporator (1) formed by bending the evaporator tubes (1) into the combustion chamber (20). ), which are further guided parallel to the tubular tent (13) of the evaporator (1) and are inserted into the tubular wall of the inclined bottom of the second draft of the steam boiler (19). Steam boiler rear wall according to claim 1, characterized in that the connection of the superheater tubes (2) to the evaporator tubes (1) into an all-metal gas-tight pipe wall is converted by flat steel rods (17) and suitable shaped sheets (18). 3. A steam boiler rear pan according to claim 1, characterized in that the superheater tubes (2) are connected by forged fittings (15) to the larger diameter steam superheater tubes (14) which form a flue gas discharge grill (10) from the steam boiler. wherein the front tubes (16) of the flue gas discharge grille (10) of the steam boiler fit into the gap of the evaporator tube wall (13).