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Method for producing ethanol and biogas and co-producing electricity by using corn straws

A technology of corn stalks and ethanol, which is applied in fermentation, biofuels, machines/engines, etc., can solve problems such as difficult large-scale production, failure to adopt, and environmental pollution, so as to improve comprehensive utilization rate, increase energy utilization rate, and reduce The effect of production costs

Active Publication Date: 2014-01-15
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] (2) This technology does not make full use of the raw materials. Judging from the yield of 52.6% coarse pulp and 34.5% fine pulp, the raw materials have a large loss in the pulping process
In addition, in the long fiber bleaching process, the lignin and hemicellulose in the long fiber are removed due to the use of hydrogen peroxide and sodium hydroxide to cook the long fiber, but this technical solution does not lose this part of hemicellulose and lignin are utilized
In addition, a large amount of black liquor will be produced in the process of cooking and pulping with sodium hydroxide, and if it is discharged directly, it will cause great pollution to the environment
[0020] (3) In the process of synchronous saccharification and fermentation, the technical solution does not use bacteria that can simultaneously utilize pentose and hexose sugars for fermentation, and the remaining hemicellulose in short fibers cannot be effectively converted into ethanol
The ethanol yield of this technology is not high, only 12.9g / 100g substrate
In addition, the amount of enzyme used in fermentation is relatively large, as high as 20 FPU / g substrate, and it is difficult to carry out large-scale production in the case of high prices of commercial enzymes

Method used

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  • Method for producing ethanol and biogas and co-producing electricity by using corn straws
  • Method for producing ethanol and biogas and co-producing electricity by using corn straws
  • Method for producing ethanol and biogas and co-producing electricity by using corn straws

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Such as figure 2 As shown in the flow chart shown, the corn stalks are processed by the following method to produce ethanol and biogas and co-generate electricity at the same time.

[0079] ① Pre-impregnation: Firstly, take corn stalks, grind them to 1-5 cm with a hammer mill, and then use 0.2% sulfuric acid to pre-impregnate corn stalks at room temperature and pressure for 120 minutes.

[0080] ②Steam explosion treatment: place the pre-impregnated straw in a steam explosion reactor at a temperature of 190°C (pressure 1.25MPa) for 10 minutes, then open the valve instantly (less than 0.5 seconds) to remove the pre-treated straw. The straw pulp is flushed into the flash tank.

[0081] ③ Simultaneous saccharification, fermentation and distillation: the straw pulp in the flash tank is placed in the fermentation tank so that the solid-liquid mass percentage in the fermentation system is 10%, and the fermentation system also contains 0.5g / l diammonium hydrogen phosphate and...

Embodiment 2

[0092] Such as figure 2 As shown in the flow chart shown, the corn stalks are processed by the following method to produce ethanol and biogas and co-generate electricity at the same time.

[0093] ① Pre-impregnation: Firstly, take corn stalks, grind them to 1-5 cm with a hammer mill, and then use 1% acetic acid to pre-impregnate corn stalks at room temperature and pressure for 120 minutes.

[0094] ②Steam explosion treatment: place the pre-impregnated straw in a steam explosion reactor at a temperature of 200°C (pressure 1.55MPa) for 5 minutes, then open the valve instantly (less than 0.5 seconds), and the pretreated straw The straw pulp is flushed into the flash tank.

[0095] ③ Synchronous saccharification and fermentation and distillation, ④ solid residue combustion to generate electricity, ⑤ anaerobic fermentation steps are the same as in Example 1.

[0096] Relevant technical indicators are as follows:

[0097] The recoveries of glucose and xylose after dilute acetic ac...

Embodiment 3

[0104] Such as figure 2 As shown in the flow chart shown, the corn stalks are processed by the following method to produce ethanol and biogas and co-generate electricity at the same time.

[0105] ① Pre-impregnation: Firstly, take corn stalks, grind them to 1-5 cm with a hammer mill, and then use 1% acetic acid to pre-impregnate corn stalks at room temperature and pressure for 120 minutes.

[0106] ②Steam explosion treatment: place the pre-impregnated straw in a steam explosion reactor at a temperature of 200°C (pressure 1.55MPa) for 5 minutes, then open the valve instantly (less than 0.5 seconds), and the pretreated straw The straw pulp is flushed into the flash tank.

[0107] ③ Simultaneous saccharification, fermentation and distillation: the straw pulp in the flash tank is placed in the fermentation tank so that the solid-liquid mass percentage in the fermentation system is 10%, and the fermentation system also contains 0.5g / l diammonium hydrogen phosphate and diammonium ...

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Abstract

The present invention provides a method for generating electricity and co-producing ethanol and biogas by using corn straws. The method comprises the following steps: (1) pre-dipping, (2) a steam explosion treatment, (3) synchronous saccharification fermentation and distillation, (4) solid residue burning power generation, and (5) anaerobic fermentation. According to the method, cellulose, hemicellulose and lignin in straws are respectively converted into ethanol, biogas and electric energy, and the electric energy and the remaining steam during the power generation process are adopted to solve the part of energy consumption during the ethanol production process so as to increase straw utilization rate and reduce cellulosic ethanol production cost.

Description

technical field [0001] The invention belongs to the field of biomass energy, and in particular relates to the corn stalk alcohol-electricity cogeneration technology, in particular to a method for using corn stalks to produce ethanol and biogas cogeneration for power generation. Background technique [0002] With the continuous development of economy and society, the global demand for energy continues to grow, and the problems of energy shortage, environmental pollution and climate change caused by the massive consumption of traditional fossil energy are becoming increasingly acute. As a kind of renewable energy, biomass energy has been paid more and more attention by governments and scientists of various countries. Straw is a good clean renewable energy and one of the new energy sources with the most potential for development and utilization, with good economic, ecological and social benefits. There are many ways to develop and utilize straw, such as straw returning to the ...

Claims

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Application Information

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IPC IPC(8): C12P7/10C12P5/02F01D15/10
CPCY02E50/16Y02E50/10Y02E50/30
Inventor 高苏杰吴毅赵鹏翔赵承宇赵正凯贵多
Owner STATE GRID CORP OF CHINA
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