Biomass cascade deashing pretreatment method

A biomass and pretreatment technology, applied in the direction of liquid cleaning methods, chemical instruments and methods, cleaning methods and appliances, etc., can solve the problems of high wastewater treatment costs, environmental pollution, biomass hydrolysis, and degradation of biomass quality , to achieve the effects of reducing the concentration required for pickling, avoiding hydrolysis, and reducing equipment loss

Active Publication Date: 2020-10-30
ZHEJIANG FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost of water washing is low, it can only remove sand on the surface of biomass and some water-soluble metal elements inside, and the deashing efficiency is extremely low
Inorganic pickling method, including solutions such as hydrochloric acid, sulfuric acid and nitric acid, on the one hand, the cost of elution solvent is high, on the other hand, high concentration of strong acid will cause serious hydrolysis of biomass, resulting in a decline in biomass quality, resulting in greater quality Loss, high-concentration strong acid washing requires a large amount of water to remove in the later stage, resulting in a large amount of acidic wastewater, resulting in very high wastewater treatment costs and serious environmental pollution

Method used

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  • Biomass cascade deashing pretreatment method

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Effect test

Embodiment 1

[0022] Embodiment 1 (experimental group):

[0023] A method for pretreatment of biomass cascade deliming provided in this embodiment comprises the following steps:

[0024] (1) Soak the rice husk powder in water according to the solid-liquid ratio of 1:30, stir at 50°C for 4 hours, filter, and dry at 105°C for 24 hours to obtain stepwise water-washed biomass powder (C-H 2 O-RS).

[0025] (2) The water-washed biomass powder was soaked in 0.1mol / L acetic acid solution, stirred at 50°C for 4h, filtered, and dried at 105°C for 24h to obtain stepwise acetic acid-washed biomass powder (C-HAC-RS).

[0026] (3) Immerse the acetic acid-washed biomass powder in 0.1mol / L hydrochloric acid solution, stir at 50°C for 4h, and then filter to obtain the cascade hydrochloric acid-washed biomass powder, and finally obtain the cascade pretreated delimed biomass (C -RS).

[0027] (4) Using nitric acid and hydrogen peroxide as digestion agents, the samples were digested and kept at 220°C, and t...

Embodiment 2

[0028] Embodiment 2 (control group):

[0029] A method for pretreatment of biomass cascade deliming provided in this embodiment comprises the following steps:

[0030] (1) Soak the rice husk powder in water, 1.0mol / L acetic acid solution and 1.0mol / L hydrochloric acid solution according to the solid-liquid ratio of 1:30, stir at 50°C for 4h, filter, and dry at 105°C 24h to obtain the hydrated biomass mixture, the acetic acid biomass mixture and the hydrochloric acid biomass mixture respectively, and finally obtain the water-washed biomass (H 2 O-RS-1), acetic acid delimed biomass (HAC-RS-1) and hydrochloric acid delimed biomass (HCl-RS-1).

[0031] (2) Using nitric acid and hydrogen peroxide as digestion agents, the samples were digested and kept at 220°C, and the ash content in the obtained digestion solution was determined by ICP-OES.

Embodiment 3

[0032] Embodiment 3 (control group):

[0033] A method for pretreatment of biomass cascade deliming provided in this embodiment comprises the following steps:

[0034] (1) Soak rice husk powder in water, 0.1mol / L acetic acid solution and 0.1mol / L hydrochloric acid solution according to the ratio of solid to liquid: 1:30, stir at 50°C for 4h, filter, and dry at 105°C 24h to obtain the hydrated biomass mixture, the acetic acid biomass mixture and the hydrochloric acid biomass mixture respectively, and finally obtain the water-washed biomass (H 2 O-RS-0.1), acetic acid delimed biomass (HAC-RS-0.1) and hydrochloric acid delimed biomass (HCl-RS-0.1).

[0035] (2) Using nitric acid and hydrogen peroxide as digestion agents, the samples were digested and kept at 220°C, and the ash content in the obtained digestion solution was determined by ICP-OES.

[0036] Table 1: Effects of different deliming agents, different concentrations and different removal methods on the content and remo...

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Abstract

The invention discloses a biomass cascade deashing pretreatment method. The biomass cascade deashing pretreatment method comprises the steps that biomass powder is added into water, and stirring and washing are carried out to obtain water-washed biomass powder; the water-washed biomass powder is immersed in an organic acid solution, and stirring and washing are carried out to obtain organic-acid-washed biomass powder; the water-washed and organic-acid-washed biomass powder is immersed in an inorganic acid solution, and stirring and washing are carried out to obtain inorganic-acid-washed biomass powder; and then water-washing, filtering and drying are carried out to obtain cascaded deashing pretreated biomass. The removal rate of ash is higher, sand, stone and metal elements that are easilysoluble in water can be removed, and metals that are insoluble in water can be removed. Compared with a pure inorganic acid washing deashing method, the biomass cascade deashing pretreatment method requires lower acid concentration, is lower in cost of a deashing agent, higher in ash removal rate, more environmentally friendly and lower in equipment loss, and can avoid serious hydrolysis phenomenon of biomass. The advantages of water washing and acid washing are balanced, the concentration required for acid washing is reduced, and the efficiency of ash removal is improved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of biomass energy, and in particular relates to a method for stepwise deashing pretreatment of biomass. Background technique [0002] In 2020, the total installed capacity of biomass power generation in my country will reach 30 million kilowatts, the annual utilization of biomass solid briquette fuel will reach 50 million tons, the annual utilization of biogas will reach 44 billion cubic meters, and the annual utilization of biofuel ethanol will reach 10 million tons. The annual utilization of diesel oil reaches 2 million tons. Biomass has been widely used in thermochemical conversion processes such as combustion, pyrolysis, and gasification to produce bioenergy and biochemicals. In some biomass utilization processes, ash is the main component that cannot be ignored. For example, the two common biomass raw materials of rice husk and cotton straw contain 15% and 6.5% ash respectively. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B3/04B08B3/08B08B3/10B08B13/00
CPCB08B3/04B08B3/08B08B3/10B08B13/00
Inventor 马中青黄明杨优优赵超
Owner ZHEJIANG FORESTRY UNIVERSITY
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