Waste heat recovery boiler suitable for maleic anhydride device

Abstract

The invention relates to the technical field of heat exchangers, in particular to a waste heat recovery boiler suitable for a maleic anhydride device, the waste heat recovery boiler comprises an outer pressure-bearing cylinder, an inner guide cylinder and a plurality of heat exchange tube sets, the outer pressure-bearing cylinder is cylindrical, and the inner guide cylinder is arranged in the outer pressure-bearing cylinder in a penetrating mode; a heat exchange tube bundle formed by main body sections of a plurality of heat exchange tube groups is covered by the inner guide cylinder, and the radial section of the inner guide cylinder is a polygon matched with the heat exchange tube bundle; compared with the prior art, starting from an original square single outer shell with poor pressure bearing capacity, the original outer shell is divided into the outer pressure bearing cylinder and the inner guide cylinder according to the working condition with large pressure bearing capacity, and the inner wall of the inner guide cylinder restrains and guides the flow direction of heat exchange fluid, so that the inner guide cylinder makes full contact with the heat exchange pipe set, the shell pass space is fully utilized, and the heat exchange efficiency is improved; and the circular outer pressure-bearing cylinder mainly bears fluid pressure, so that the flow guide effect of a polygonal cylinder body is kept, pressure can be borne in a circular form, and the advantages of high pressure-bearing capacity and good flow guide effect are achieved.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to equipment for heat exchange between two fluid media used in petroleum refining, chemical industry, electric power, metallurgy and other fields, and in particular to a waste heat recovery boiler suitable for maleic anhydride plants. Background technique [0002] A heat exchanger is a device that transfers part of the heat of a hot fluid to a cold fluid, also known as a heat exchanger. [0003] Tubular heat exchangers for the production of maleic anhydride, such as Figure 4 As shown in the figure, it includes the outer casing and the multiple groups of heat exchange finned tubes penetrating into the outer casing. Since the tube bundle of the multiple groups of heat exchange finned tubes is a square as a whole, if the shell side cylinder is made into a circle, the heat exchange fins in the square A space is left around the tube bundle where the heat transfer fluid is ineffi...

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Problems solved by technology

[0005] It can be seen from the above that, in the case that the outer wall of the outer casing does not add deflectors, although the square outer casing has good flow diversion effect, the pressure bearing effect is poor, while the use of Although the circular outer casing has good pressure bearing effect, the flow diversion effect is poor, and the existing technology is difficult to be compatible with the flow diversion effect and the pressure bearing effect

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