Design Method of Steam Boiler with Different Riser and Downpipe Diameters

Abstract

The invention provides a designing method of a steam boiler and provides a designing method for a steam boiler with a flow stabilizing device of a novel structure. The steam boiler comprises an upperboiler barrel, a lower boiler barrel, an ascending pipe and a descending pipe, wherein the ascending pipe and the descending pipe are connected between the upper boiler barrel and the lower boiler barrel. The steam boiler is characterized in that the pipe diameter of the ascending pipe is larger than that of the descending pipe. By arranging the pipe diameter of the ascending pipe to be greater than that of the descending pipe, resistance of the descending pipe is mainly increased, the resistance of the ascending pipe is reduced, steam flows in an evaporation portion more easily, and a hoop pipeline better forms circulation.

Description

technical field [0001] The present invention is a project commissioned by colleges and universities to carry out research and development. The invention belongs to the field of steam generation, in particular to a steam boiler, and belongs to the field of IPC classification number F22. Background technique [0002] The circuit that receives heat from the furnace and makes the fluid flow from a low level to a high level is called an "ascending loop", while the circuit that receives heat and makes a fluid flow from a high level to a low level is called a "falling loop". A circuit consists of a pipe or a group of pipes leading from a common point, such as a header or steam drum, and terminating at a common point, also a header or drum. [0003] In most natural circulation boiler designs, the heated tubes making up the evaporating section generally provide upward flow, but in multi-drum boilers, the descending heated tubes of the evaporator bundle do not. In this type of boile...

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Problems solved by technology

The impact phenomenon will cause large noise vibration and mechanical shock, causing damage to the equipment

[0006] A variety of riser devices to solve the above problems have also been designed in the previous application, such as 2017102546447 multi-pipe type, but this kind of device is found in operation, because the pipes are tightly combined, so the space formed between the three pipes A is relatively small, because the space A is formed by the convex arc of three pipes, so most of the space A is narrow, which will make it difficult for the fluid to enter and pass through, resulting in a short circuit of the fluid, which affects the heat exchange of the fluid and cannot play a good role. Steady flow

Simultaneously because the many tubes of above-mentioned structure are combined together, manufacture difficulty

Another example is the 2017102666326 structure. Although this structure solves the fluid short circuit phenomenon, there is a problem that the flow area is greatly reduced, resulting in an increase in flow resistance.

Another example is the ring-shaped flow stabilization device of 2017102949490. In the ring structure, the flow stabilization device adopts a ring structure, which leads to uneven separation of the annulus of the flow stabilization device in the circumferential direction, and because of the ring structure, the positions of the four angles of the annulus Acute angles less than 90 degrees occur, which can cause problems with fluid flow short circuits in the acute angles less than 90 degrees

[0007] In the prior art, the pipe diameters of the ascending and descending pipes are basically the same, which leads to the same resistance caused by the same pipe diameter of the ascending and descending pipes when the steam flows, thus affecting the natural circulation of steam

[0008] In view of the above problems, the present invention improves on the basis of the previous invention, and provides a new steam boiler and its design method, thereby solving the problem of low heat absorption efficiency of the rising tube

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