Design scheme of ultrahigh-temperature ultrahigh-pressure pore type heat exchanger/ evaporator

Abstract

The invention provides a design scheme of an ultrahigh-temperature ultrahigh-pressure pore type heat exchanger/ evaporator. Special oval or semicircular or conical pores formed in a heat exchange unitare used for heat exchange. Heat exchange between the pores of small holes or micropores mainly based on clinging type multi-layer metal heat conduction is high in heat transfer coefficient and goodin heat transfer energy efficiency, the heat transfer temperature difference between the primary side and the secondary side is small, safe and stable heat transfer can be achieved between the pores under the extreme high temperature or extreme high pressure condition, and high efficiency, simplicity, safety and reliability are achieved. The pipe breaking and water loss accidents of a traditionalshell-and-tube heat exchanger under the ultrahigh-temperature ultrahigh-pressure work condition can be well avoided. Compared with a shell-and-tube heat exchanger with the same heat transfer capacity,the size, weight and manufacturing cost of the pore type heat exchanger are reduced by one third or above. Under the condition of proper heat exchange unit material selection and proper heat transferpore design selection, heat transfer under the extreme high temperature not exceeding 1000 DEG C or extreme high pressure not exceeding 1000kg under the severe heat transfer condition is supported. The pore type heat exchanger/ evaporator belongs to the technical field of heat transfer equipment and is mainly applied to the fields of nuclear power and thermal power, petrochemical engineering, chemical engineering and medicine, metallurgical energy, food and electronics and the like.

Description

[0001] (1) Technical field: [0002] The present invention is a new design scheme of heat exchanger / evaporator suitable for extreme high temperature or high pressure. It utilizes the special channel set inside the heat exchange unit module for heat exchange, which is called channel heat exchanger / evaporator. The heat exchange between small holes or micropores, which is dominated by heat conduction of heat transfer materials, has high heat transfer coefficient and small heat transfer temperature difference. It can conduct heat safely and stably between channels under extreme high temperature or extremely high pressure conditions. It is efficient, simple and safe. Reliable features, belonging to the technical field of heat transfer equipment, the main application areas are nuclear power thermal power, petrochemical, chemical medicine, metallurgical energy, food electronics, etc. [0003] (two) background technology: [0004] The nuclear steam generator (steam generator) is a heat...

AI Technical Summary

Problems solved by technology

[0013] In the future, the pressurized water reactor nuclear power plant will also face the market requirements of ultra-supercritical power generation, and the U-tube shell-and-tube evaporator is technically unable to meet the heat transfer requirements of extreme high temperature or extreme pressure

Even in the face of the current working pressure and temperature of the primary circuit, since the material of the heat transfer tube cannot be used in step with the temperature field, the design and manufacture of the U-tube shell-and-tube evaporator is expensive, and the cost can be reduced by one-third. A Design Potential

[0014] Disadvantages: Whether it is a U-tube evaporator of a pressurized water reactor or a spiral coil evaporator of a high-temperature gas-cooled reactor, the shell-and-tube evaporator is required under extremely high temperature or extremely high pressure conditions, or ultra-high temperature and ultra-high pressure at the same time. Under severe conditions (such as ultra-supercritical power generation parameters), the design scheme exposes insufficient equipment reliability, which can easily lead to the failure of heat transfer tubes and even large breach accidents, posing a threat to the safety of nuclear reactors; and the traditional design The equipment cost of the scheme is too expensive, which seriously affects the economics of the project

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