Double-pipe heat transfer enhancement unit component and penetrating hybrid cyclone efficient double-pipe heat exchanger

Abstract

The invention discloses a double-pipe heat transfer enhancement unit component and a penetrating hybrid cyclone efficient double-pipe heat exchanger. The double-pipe heat transfer enhancement unit component comprises an inner pipe, an outer pipe, an inner pipe twisting reinforcement part and an inter-pipe twisting reinforcement part, wherein an inner cavity allowing sludge to circulate therein isdefined in the inner pipe; the outer pipe sleeves the inner pipe; an outer cavity allowing sludge to circulate therein is defined between the outer pipe and the inner pipe; a first circulation openingis formed in the inner pipe twisting reinforcement part; and a second circulation opening is formed in the inter-pipe twisting reinforcement part. According to the double-pipe heat transfer enhancement unit component of the embodiment, two heat exchange fluids can conduct complicated flowing including spirally rotary flowing and porous penetrating hybrid flowing, so that the heat exchange fluidsare prevented from bias flowing, precipitation, cementation and blockage, mud-mud long-term stable and efficient heat exchange can be realized, the sludge conveying flow resistance and the pumping power dissipation are remarkably reduced, and accordingly, remarkable energy-saving economic benefits and environment-friendly social benefits can be achieved in sludge treatment.

Description

technical field [0001] The present invention relates to the technical field of heat exchangers, more specifically, to a through-mixing swirl high-efficiency casing heat exchanger, in particular to a through-mixing swirl casing-type heat exchanger with efficient mud-mud heat exchange device. Background technique [0002] With the continuous advancement of my country's urbanization and the continuous improvement of environmental protection requirements, more and more attention has been paid to the treatment of sewage sludge. In many sludge treatment technologies, it is necessary to heat the wet sludge to a higher temperature, such as a sludge wet oxidation treatment process, the sludge needs to be heated to 150°C-370°C, and the wet sludge is placed in a high-temperature and high-pressure reactor After the medium reaction, the temperature is lowered and the water is filtered. In the process of heating and cooling wet sludge, it is necessary to maximize the heat recovery of th...

AI Technical Summary

Problems solved by technology

The current wet sludge heat exchangers mainly have multi-section shell-and-tube heat exchangers, casing heat exchangers and plate heat exchangers, but due to the high viscosity, easy cohesion, easy sedimentation and shearing of wet sludge Due to characteristics such as shear thinning, sludge deviation, deposition, sticking, clogging, poor heat transfer performance and rapid and obvious decline in heat transfer performance, as well as large transmission flow resistance and large transmission power consumption, etc.

[0003] For the sludge multi-stage shell-and-tube heat exchanger, the sludge flow rate in the multiple heat exchange tubes in the tube side is very uneven, and even only a few heat exchange tubes have sludge flowing through them, while most of the heat exchange tubes have extremely high sludge flow rates. Low speed or no flow, the sludge gradually sticks to the surface of the heat exchange tube or even blocks some heat exchange tubes, and in severe cases, the heat exchanger is blocked

In addition, the heat transfer performance of the heat transfer surface where the sludge flows at a normal flow rate is poor, and the heat transfer performance will soon decrease due to factors such as dirt sticking to the wall of the heat transfer tube during operation, and the transport of sludge Increased resistance and even frequent blockages make the entire sludge treatment plant shut down

Compared with the tube side, due to the baffle vortex in the shell side, the sludge flow is more uneven, the sludge is easier to deposit and block, and the heat transfer performance is worse

Especially for the sludge before the reaction, both its heat transfer performance and flow performance are particularly poor, and the phenomenon of sludge deviation, deposition, cohesion, and clogging is very serious. - Mud is stable in heat exchange, but the heat exchange between reacted sludge and water and other process media is also very unstable and the heat exchange performance is poor

[0004] For the sludge tube-and-tube heat exchanger, compared with the sludge multi-stage shell-and-tube heat exchanger, the uniformity of the sludge flow rate in the casing and between the casings has been improved to a certain extent, but there are still obvious differences. Uneven flow, it is easy to produce sludge layered flow, deposition, bonding heat exchange tube wall and other phenomena

During the operation, whether it is between the casing or inside the casing, there will soon be sludge layered flow, a large amount of sedimentation at the bottom, half-pipe flow, and until the heat exchange tube is blocked.

In addition, the sludge fluidity between the sleeves is poor and it is very easy to block, the heat transfer performance of the heat exchanger is also relatively poor, and the flow resistance of the sludge transportation is also particularly large, resulting in relatively large power consumption for sludge transportation

In addition, due to the casing structure, the sludge casing heat exchanger occupies a particularly large area, and the construction cost is high. In some cases, it is even impossible to arrange equipment, etc.

[0005] For sludge plate heat exchangers, although wide channel design is generally adopted and the structure is relatively compact, the above-mentioned problems of sludge deposition, sticking or even clogging and poor heat transfer performance also exist.

[0006] In summary, due to the characteristics of high viscosity, easy cohesion, easy deposition and delamination, and shear thinning of wet sludge, sludge deviation, deposition, adhesion, clogging, and heat transfer are common in existing sludge heat exchangers. The problem of poor performance and rapid and obvious decline in heat transfer performance, as well as the problem of large flow resistance of sludge conveying and large pumping power consumption

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