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Method for arranging structure of heat exchange pipes of concrete heat storage system for solar thermal power generation

A technology of solar thermal power generation and heat exchange pipelines, which is applied in the field of solar thermal power generation heat storage systems, can solve problems such as pipeline structure layout methods that have not been reported, and achieve the effects of reducing power generation costs, increasing heat exchange rates, and improving efficiency

Inactive Publication Date: 2010-11-03
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, in addition to the heat storage material itself, the most important thing for solar thermal power generation is the direct heat exchange efficiency between the heat storage material and the heat medium. From the current published literature, there is no report on the pipeline structure layout method in the solar thermal power generation system.

Method used

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  • Method for arranging structure of heat exchange pipes of concrete heat storage system for solar thermal power generation
  • Method for arranging structure of heat exchange pipes of concrete heat storage system for solar thermal power generation
  • Method for arranging structure of heat exchange pipes of concrete heat storage system for solar thermal power generation

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The heat exchange pipe 9 is heat-resistant stainless steel. The inlet tube is a hollow tube with an inner diameter of 10mm and an outer diameter of 16mm. The pipe directly exchanging heat with the concrete heat storage material has an inner diameter of 6mm and an outer diameter of 12mm. 100mm, each length is 70mm, the inner diameter of the outlet pipe is the same as that of the inlet pipe. The heat exchange medium is hot mineral oil with a flow rate of 1m / s. The inlet temperature is 380°C and the pressure is 0.1MPa.

[0023] The composition of heat storage material 8 is: basalt aggregate 38%, steel slag aggregate 32%, aluminate cement 8%, slag powder 15%, silicon micropowder 5%, attapulgite 2%. After the raw materials are dry-mixed evenly, add 6% water, mix evenly and place them in a steel mold with heat exchange pipes, demould after 24 hours, and maintain in water at 20-25°C for 72 hours, then dry at 100 Bake at -120°C for 24 hours to obtain a density of 2.98g / cm 3...

Embodiment 2

[0025]The heat exchange pipe 9 is heat-resistant stainless steel. The inlet tube is a hollow tube with an inner diameter of 12mm and an outer diameter of 18mm. The pipe directly exchanging heat with the concrete heat storage material has an inner diameter of 6mm and an outer diameter of 12mm. 80mm, each length is 70mm, the inner diameter of the outlet pipe is the same as that of the inlet pipe. The heat exchange medium is hot mineral oil with a flow rate of 1m / s. The inlet temperature is 450°C and the pressure is 0.2MPa.

[0026] The composition of heat storage material 8 is: basalt aggregate 35%, copper slag aggregate 35%, aluminate cement 6%, slag powder 17%, silicon micropowder 4%, attapulgite 3%. After the raw materials are dry-mixed evenly, add 5.5% water, mix evenly, place in a steel mold with a heat exchange pipe, demould after 24 hours, and maintain in water at a temperature of 20-25°C for 72 hours. Bake at 100-120°C for 24 hours to obtain a density of 2.96g / cm 3 ,...

Embodiment 3

[0028] The heat exchange pipe 9 is heat-resistant stainless steel. The inlet tube is a hollow tube with an inner diameter of 12mm and an outer diameter of 18mm. The pipe directly exchanging heat with the concrete heat storage material has an inner diameter of 6mm and an outer diameter of 12mm. 90mm, each length is 70mm, the inner diameter of the outlet pipe is the same as that of the inlet pipe. The heat exchange medium is hot steam with a flow rate of 1m / s. The inlet temperature is 350°C and the pressure is 0.2MPa.

[0029] The composition of heat storage material 8 is: basalt aggregate 38%, copper slag aggregate 32%, aluminate cement 7%, slag powder 16%, silicon micropowder 4%, attapulgite 3%. After the raw materials are dry-mixed evenly, add 5.5% water, mix evenly, place in a steel mold with a heat exchange pipe, demould after 24 hours, and maintain in water at a temperature of 20-25°C for 72 hours. Bake at 100-120°C for 24 hours to obtain a density of 2.98g / cm 3 , comp...

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Abstract

The invention relates to a method for arranging the structure of heat exchange pipes of a concrete heat storage system for solar thermal power generation, comprising the following steps: arranging a plurality of heat exchange pipes which are arranged equidistantly in a concrete heat storage block (5), connecting two ends of each heat exchange pipe with an inlet pipe (1) and an outlet pipe (7) through a connecting pipe, arranging an inlet control valve (2) and an air inlet and evacuation pipe (3) on each inlet pipe (1), arranging an air inlet and evacuation valve (4) on the air inlet and evacuation pipe (3), and arranging an outlet control valve (6) on each outlet pipe (7). The solar thermal power generation technology is made to be practical due to the adoption of the method. When the structure of the heat exchange pipes, which is arranged by the method, is used, the heat conducting medium is made to flow in the heat exchange pipes from the inlet pipes, then the switch and the flow rate are adjusted through the inlet control valves, the heat is exchanged by the heat exchange pipes and is stored in the concrete heat storage block, and the heat conducting medium is made to flow out of the heat exchange pipes from the outlet pipes. The invention reduces the power generation cost, improves the heat exchange and storage efficiency and ensures that the working temperature of the concrete heat storage system is 600-900 DEG C which is much higher than the use temperature of the prior molten salt.

Description

technical field [0001] The invention relates to a heat storage system for solar thermal power generation, in particular to a method for arranging a heat exchange pipe structure of a heat storage material for solar power generation. Background technique [0002] Heat storage scheme design is an important technology in solar steam power generation. The performance and cost of heat storage materials are one of the main factors that determine the construction and operation costs of large-scale solar power plants. Heat storage materials used in solar power generation should meet the following requirements: heat storage materials should have high energy density; heat storage materials and heat exchange liquids should have good heat conduction; heat storage materials should have good chemical and mechanical stability; The heat storage material has good chemical compatibility with the heat exchanger and the heat exchange liquid; it should be fully reversible during the heat storage ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24J2/46F28D20/00C09K5/14
CPCY02E10/40Y02E70/30Y02E60/142Y02E60/14Y02P20/10
Inventor 周卫兵朱教群郭成州黎锦清童雨舟
Owner WUHAN UNIV OF TECH
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