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Comprehensive utilization method for high-temperature energy

A high temperature and energy technology, applied in the field of comprehensive utilization of high temperature energy, to achieve the effect of improving cleanness or "greenness", improving energy efficiency and reducing pollutant emissions

Active Publication Date: 2015-03-25
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no reports of ultra-high temperature heat exchangers above 1100 °C in the literature, and ultra-high temperature heat exchangers are only one of the possible ways of gas-phase heat recovery. How to make full use of the high-temperature energy generated in the above reactions is an urgent need to solve technical issues

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0069] Such as figure 1 As shown, the two-step decomposition of CO 2 Generate CO / CO 2 The mixed gas, through CH 4 After reforming, the conversion reaction is carried out to achieve a suitable carbon-hydrogen ratio, and methanol is synthesized, while the unreacted gas and waste gas enter the gas-steam combined cycle for power generation.

[0070] The CO added during the two-step thermochemical cycle in this scheme 2 The total amount is 1000kmol / h, and CH is added after the reduction reaction 4 The amount of partial oxidation is 42kmol / h, the H produced at this time 2 The ratio of mole fraction to CO is exactly 2:1, figure 1 Shown at point B in the middle; CO / CO at the outlet of the two-step oxidation step 2 The mixed gas is added to CH 4 carry out the reformation reaction. The total methane input flow includes reformed methane flow and partial oxidation methane flow. The key point parameters in the scheme are shown in Table 2.

[0071] Table 2 Main parameter settings ...

Embodiment 2

[0083] Figure 4 is a two-step decomposition of H 2 O methanol power polygeneration system diagram, two-step decomposition of water vapor, the product is H 2 and H 2 O mixture. If in 1000kmol of H 2 with H 2 180kmol / h of CH was passed into O mixed gas 4 , and the O generated in the two-step reduction step 2 with CH 4 undergo partial oxidation. The reacted gas is dehydrated and then pressurized to synthesize methanol, and the unreacted gas is passed into the gas steam cycle to perform work. At this time, the solar heat consumption of methanol is 120.54GJ / t, and the conversion efficiency of solar energy to methanol energy is 19.48%. Compared with Kim et al.'s 2012 high-temperature solar thermochemical cycle dual-temperature water splitting efficiency of 9.3%, the solar methanol conversion efficiency has doubled.

[0084] By changing the access to the CH 4 Total amount, from 142-192kmol / h, it can be found that the energy consumption varies around 130GJ / t, while the con...

Embodiment 3

[0087] By analyzing Example 1 and Example 2, it can be found that the two-step method decomposes H 2 After O is added to complement methane, H 2 The mole fraction of CO is much higher than that of CO; while the two-step method decomposes CO 2 After adding methane for complementation, the proper carbon-to-hydrogen ratio is still not achieved for methanol synthesis, and a water-gas shift reaction is required. Therefore we consider combining Example 1 and Example 2 to get Figure 5 Example 3 shown. via the entrance to the CO 2 and H 2 The amount of O and methane is adjusted so that Figure 5 The ratio of carbon to hydrogen in the mixed gas at point D is 1:2. Here, we will CO 2 The flow rate is taken as 1000kmol / h, H 2 The flow rate of O is taken as 1400kmol / h, and can be obtained by adjusting the input flow rate of methane Figure 5 Component mole fraction of point D in middle and the change curve of mixing temperature ( Figure 6 (a)). CO 2The mole fraction of is abo...

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Abstract

The invention discloses a comprehensive utilization method for high-temperature energy. The comprehensive utilization method for high-temperature energy comprises the following steps: charging reaction raw materials in a reactor, and carrying out a thermal chemical reaction through a two-step method at a high temperature; adding a hydrocarbon compound in the generated product, carrying out waste heat and waste gas recycling by virtue of a chemical reaction, and lowering the temperature of a fuel to the temperature range of the mature solution of the existing heat exchange technology while further increasing the calorific value of the fuel. The comprehensive utilization method disclosed by the invention is capable of decomposing H2O and CO2 into H2 and CO, and the net carbon emission of the fuel generated in this way during combustion is zero; reasonable utilization for waste heat and waste gas in the two-step method can be realized through complementation with fossil energy, thus methanol-power poly-generation can be realized while an ultra-high-temperature heat exchange is not used, and moreover, for an overall effect, the carbon emission of the unit calorific value of the fuel is reduced, and dependence on the fossil energy is reduced; if heat recovery is carried out on a system, the efficiency of the system can be further increased, and the carbon emission of the unit calorific value can be reduced.

Description

technical field [0001] The invention relates to the technical field of new energy, in particular to a comprehensive utilization method of high-temperature energy. Background technique [0002] Thermochemistry is a type of energy utilization technology that uses high-temperature heat sources to drive chemical reactions, such as obtaining high-temperature heat energy through focused solar energy or nuclear reactors, and performing decomposition and gasification of fossil energy. One of the ultimate goals of the development of thermochemical technology is to completely reverse the combustion reaction of fossil energy through the high temperature generated by non-carbon energy (such as nuclear energy) and / or renewable energy (such as solar energy), and the reverse reaction driving the combustion reaction is water or The decomposition of "combustion products" such as carbon dioxide, so as to realize the production of fuel (and obtain pure oxygen at the same time), thereby replaci...

Claims

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Application Information

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IPC IPC(8): C01B3/02C07C29/151C07C31/04C10J1/20
CPCY02P20/129Y02P20/50
Inventor 郝勇孔慧
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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