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A flow control method for heating a heated fluid in stages by using a heat exchange system

A technology for heating and heating fluid in stages, which is applied in steam generation methods, control systems, and steam generation methods using solar energy. The effect of reducing the temperature difference between the inlet and outlet

Active Publication Date: 2018-05-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This makes the entropy increase generated by the whole heat exchange process very large, and the energy utilization rate is very low.

Method used

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  • A flow control method for heating a heated fluid in stages by using a heat exchange system
  • A flow control method for heating a heated fluid in stages by using a heat exchange system

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Embodiment Construction

[0014] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0015] refer to figure 1 , a flow control method that uses a heat exchange system to heat the heated fluid in stages. The heat exchange system uses a heating fluid (preferably heat transfer oil) to heat the heated fluid (preferably water) from supercooled water to superheated steam, which includes Preheater 1, evaporator 2, superheater 3, steam turbine 6, generator 7, condenser 8, condensate pu...

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Abstract

The invention belongs to the field of heat exchange equipment, and discloses a flow control method for heating a heated fluid in stages by adopting a heat exchange system. The heat exchange system comprises a pre-heater, an evaporator and a super-heater; the pre-heater is connected with the evaporator and the super-heater in sequence; the pre-heater is used for heating a sub-cooled fluid to a saturated fluid; the evaporator is used for heating the saturated fluid to a saturated gas; the super-heater is used for heating the saturated gas to a superheated gas. According to the flow control method for heating the heated fluid in stages by adopting the heat exchange system, the terminal temperature difference between an outlet and an inlet of each evaporator is reduced by controlling the flow of the heating fluid in the heat exchange system, so that the entropy production produced in a heat exchange process can be reduced; the energy utilization rate of the system is improved.

Description

technical field [0001] The invention belongs to the field of heat exchange equipment, and more specifically relates to a flow control method for heating a heated fluid in stages by using a heat exchange system. Background technique [0002] In the traditional method of using the heating fluid to heat the heated fluid from subcooled liquid to superheated steam, the flow rates of the heating fluid and the heated fluid do not change during the entire heat exchange process. The design of the existing preheater, evaporator and superheater is to select the inlet temperature difference of the evaporator, and then use the evaporation temperature of the heated fluid, the outlet temperature of the heated fluid of the superheater and the inlet temperature of the heating fluid to calculate the required heating. fluid flow. Since the heated fluid is liquid in the preheater, gas-liquid two-phase in the evaporator, and gaseous in the superheater, the specific heat capacity of the heated f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B35/00F22B1/00
CPCF22B1/006F22B35/00
Inventor 张燕平张成黄树红
Owner HUAZHONG UNIV OF SCI & TECH
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