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Fuel-reforming device and fuel-reforming method

A technology for reforming devices and combustion devices, applied in chemical instruments and methods, fuel supply devices, combustion air/combustion-air treatment, etc., can solve problems such as output power reduction and engine volumetric efficiency reduction, and achieve improved energy efficiency, Effects of increasing fuel yield and reducing NOx emissions

Pending Publication Date: 2021-11-16
NAT UNIV CORP TOKAI NAT HIGHER EDUCATION & RES SYST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it was pointed out that when hydrogen is mixed in gaseous form with air in the intake step, the volumetric efficiency of the engine decreases, resulting in a lower power output

Method used

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  • Fuel-reforming device and fuel-reforming method
  • Fuel-reforming device and fuel-reforming method

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0113] This embodiment shows an embodiment in which the fuel reformer 1 according to the present invention is used to generate fuel for a combustion device whose reference fuel is methane, the fuel supply rate is W0 = 1.0 kg / h, and the power generation is 1000 Wh.

[0114] The control means 10 stores 43 cm / s as the maximum combustion rate of methane, and also stores 346 cm / s as the maximum combustion rate of hydrogen, and stores 8 cm / s as the maximum combustion rate of ammonia. Based on these maximum combustion rates, the combustion rate coefficient C of the mixture calculated using equation (1) is 0.104. Substituting the combustion rate coefficient C into equation (2), and calculating the volume fraction M of hydrogen in the mixed gas, the volume fraction is 0.319. Thus, the volume fraction of ammonia is 0.681. High-concentration hydrogen produced by the reformer 5 and ammonia from the ammonia tank are supplied to the mixing tank 7, and they are mixed. Calculate the high ca...

Embodiment 2

[0116] Next, an example of applying the fuel reformer 30 according to the present invention to generate fuel for a combustion device as in Embodiment 1 is shown, wherein the reference fuel is methane, and the fuel supply rate is W0=1.0kg / h, and the power generation is 1000Wh. In this embodiment, the hydrogen concentration H of the low-concentration hydrogen generated by the ammonia decomposition catalyst reactor 31 is 2L It is 7.7vol%.

[0117] The control device 10 stores the maximum combustion rate and high calorific value of methane, hydrogen, and ammonia, as in the first embodiment. Then, by using equations (1) to (6), the fuel supply rate F of the mixture gas is determined m It was 28.0 NL / h, and the mixing fraction of hydrogen was 0.319. In addition, the control device 10 converts the mixing fraction (based on volume) M of the high-concentration hydrogen tank 6 to H Determined to be 0.262. Therefore, the hydrogen supply amount from the high-concentration hydrogen t...

Embodiment 3

[0121] One embodiment of the application of the fuel reformer 30 to generate fuel for a methane gas engine is shown. The control device 10 sets the temperature of the ammonia decomposition catalyst reactor to 250° C. to generate a low-concentration hydrogen mixed gas with an ammonia decomposition rate of 10%, and stores the gas in the low-concentration hydrogen tank 32 . The composition of the generated low-concentration hydrogen mixed gas was 7.5% hydrogen, 90% ammonia, and 2.5% nitrogen. Next, the reformer 5 generates hydrogen gas with a hydrogen content of 99%, and stores this gas in the high-concentration hydrogen tank 6 . Then, 73.8% of low-concentration hydrogen and 26.2% of high-concentration hydrogen are mixed and stored in the mixing tank 7 . This blend has a maximum burn rate of 43 cm / s, matching that of methane. In addition, since the high calorific value of the mixed fuel is 61MJ / kg, which exceeds the high calorific value of methane, which is 55.5MJ / kg, the flow ...

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Abstract

Provided is a fuel-reforming device comprising: an ammonia tank (4); a reformer (5) for reforming ammonia and generating high-concentration hydrogen gas having a hydrogen content of at least 99%; a mixing tank (7) for mixing ammonia and hydrogen for temporary storage; and a control means (10) for controlling the respective supply amounts of ammonia and high-concentration hydrogen gas that are supplied to the mixing tank (7). The control means (10) calculates the combustion rate coefficient C of mixed gas with respect to a reference fuel on the basis of equation (1). Equation (1): S0=SH*C+SA*(1-C). In equation (1), S0 is the combustion rate of the reference fuel, SH is the combustion rate of hydrogen, SA is the combustion rate of ammonia, and C is the combustion rate coefficient of mixed gas. In addition, on the basis of equation (2), the control means (10) determines the volume fractions of ammonia and hydrogen that are supplied to the mixing tank. Equation (2): C=1-exp(-A*MB). In equation (2), M is the volume fraction of hydrogen in mixed gas, and A and B are constants.

Description

technical field [0001] The present invention relates to a fuel reformer that generates hydrogen by decomposing ammonia and supplies gas containing ammonia and hydrogen as fuel, and a fuel reformer method using the fuel reformer. Background technique [0002] Seeking to use hydrogen energy in order to reduce CO2 emissions. However, hydrogen remains costly to produce and transport, and hydrogen-fueled fuel cell electricity is still more expensive than electricity generated using other types of energy. These economic constraints constitute factors hindering the deployment of hydrogen energy. [0003] In view of this, the use of hydrogen as fuel in combustion devices such as gas engines, gas turbines, diesel engines, gasoline engines, etc., whose power generation output is cheaper than fuel cells, is being considered. However, since hydrogen has a very high maximum combustion rate and a high calorific value, applying hydrogen alone or a mixture of hydrogen and air to a combust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/02F02D19/08F02M27/04C01B3/04C01B3/56F02M21/02
CPCF02M21/02F02M27/04Y02E60/36F02M21/04F02M21/0209F02M21/023F02M21/0224F02D19/0671F02D19/0644F02D19/081F02D35/028C01B3/047C01B2203/041C01B2203/0861C01B2203/169B01J7/00B01J8/001B01J12/002B01J12/007B01J19/0006B01J19/088B01J2208/00725B01J2219/00243B01J19/0013B01J2219/0801B01J2219/0896C01B3/501F02D19/021
Inventor 神原信志三浦友规田中裕弥池田達也
Owner NAT UNIV CORP TOKAI NAT HIGHER EDUCATION & RES SYST
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