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Preparation system and preparation method of agriculture and forestry biomass fuel

A biomass, agricultural and forestry technology, applied in the preparation system and field of agricultural and forestry biomass fuels, can solve the problems of secondary pollution, difficult to control, homologous viruses, etc., to achieve increased calorific value, high utilization rate, and reduced oxygen/carbon than the effect

Pending Publication Date: 2021-08-17
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Landfill and incineration belong to the final treatment and disposal methods, but they are prone to secondary pollution and difficult to control; the method of processing feed is controversial because of the risk of homologous viruses in feed products, aerobic composting, anaerobic composting (digestion) The treatment method has become the main direction of food waste treatment at present, but there is still the problem that the methanogenic stage takes a long time compared with the hydrolysis and acid production stages

Method used

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  • Preparation system and preparation method of agriculture and forestry biomass fuel
  • Preparation system and preparation method of agriculture and forestry biomass fuel
  • Preparation system and preparation method of agriculture and forestry biomass fuel

Examples

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preparation example Construction

[0041] see figure 1 , the present invention provides a kind of preparation method of agricultural and forestry biomass clean fuel, and described preparation method comprises the following steps:

[0042] S1, performing anaerobic fermentation on the pretreated kitchen waste to obtain a fermentation slurry including fermentation residue and mixed organic acids;

[0043] Specifically, first sort and remove large pieces of sand, stones, plastics, etc. in the raw materials of kitchen waste, and then carry out crushing and screening treatment. The particle size of the kitchen waste obtained by pretreatment is 2-4mm; The final kitchen waste is placed in a fermentation tank, and the activated sludge is used as an inoculum for anaerobic fermentation. The anaerobic fermentation temperature is 20-50°C, preferably 37°C, and the anaerobic fermentation time is 4-6 days.

[0044] Preferably, the content of the mixed organic acid is 3-10 wt%, preferably 6-8 wt%.

[0045] Preferably, the mix...

Embodiment 1

[0063] (1) Crush kitchen waste to a particle size of 2-4 mm, use activated sludge as an inoculum, and perform anaerobic fermentation at 37°C for 5 days to obtain a fermentation slurry, which includes fermentation residue and mixed Organic acid, the pH value of the mixed organic acid is 4.5, and the mass content is 7wt%;

[0064] (2) Crushing and sieving the corn stalks to a particle size of 2-4 mm, then mixing it with the fermentation slurry, and stirring at a constant temperature of 60° C. for 24 hours to obtain a mixed slurry;

[0065] (3) Put the mixed slurry obtained in step (2) in a high-temperature reactor for hydrothermal treatment to obtain biomass coke. The hydrothermal treatment time is 60 minutes, the hydrothermal treatment temperature is 180° C., and the pressure is saturated vapor pressure. The mixed The solid-to-liquid ratio of the slurry is 1:12;

[0066] (4) After the liquid components are removed from the biomass coke produced by the hydrothermal treatment, t...

Embodiment 2

[0068] Embodiment 2~7 is identical with embodiment 1 preparation method, and its difference is that hydrothermal treatment time is not the same, specifically, the hydrothermal treatment time of embodiment 1 is 60min, and the hydrothermal treatment time of embodiment 2 is 10min; The heat treatment time is 30min, and the hydrothermal treatment time of embodiment 4 is 45min; The hydrothermal treatment time of embodiment 5 is 90min; The hydrothermal treatment time of embodiment 6 is 100min; The hydrothermal treatment time of embodiment 7 is 120min; The heat treatment time is 180min.

[0069] The results of solid product yield and industrial analysis of the biomass clean fuel prepared in Examples 1 to 8 are shown in Table 1 (subtraction method).

[0070] The biomass solid product productive rate of table 1 different hydrothermal treatment time, industrial analysis form (%)

[0071] Hydrothermal treatment time Yield Volatile matter Ash moisture fixed carbon ...

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Abstract

The invention provides a preparation method and a preparation system of an agricultural and forestry biomass clean fuel. The method comprises the following steps: carrying out anaerobic fermentation on pretreated kitchen garbage to obtain fermentation slurry containing fermentation residues and mixed organic acid; allowing the pretreated agriculture and forestry biomass to be subjected to acid pickling treatment to remove alkali metal in the agriculture and forestry biomass; and carrying out hydrothermal treatment on mixed slurry obtained by mixing fermentation residues, acid liquor obtained by reacting with agricultural and forestry biomass and the agricultural and forestry biomass subjected to acid pickling treatment to obtain biomass char, and carrying out solid-liquid separation and extrusion molding on the biomass char to obtain the biomass clean fuel. According to the method provided by the invention, the alkali metal in the agricultural and forestry biomass is mildly removed by using the mixed organic acid generated by fermenting the kitchen garbage, and the biomass fuel is prepared from the agricultural and forestry biomass without the alkali metal and the fermentation residues of the kitchen garbage, so that the method has the advantages of high efficiency, safety, economy and the like.

Description

technical field [0001] The invention belongs to the technical field of biomass fuel preparation, in particular to a preparation system and method for agricultural and forestry biomass fuel. Background technique [0002] Due to the gradual depletion of fossil energy, the state strongly supports the active development of potential new renewable energy sources that can replace fossil fuels. Zero-emission energy has attracted widespread attention, but the content of alkali metal elements such as K in biomass is high, and the energy density is low, which seriously restricts its direct application in boiler combustion. [0003] In addition, the current treatment methods of kitchen waste mainly include landfill, incineration, aerobic composting, anaerobic digestion, and processed feed. Landfill and incineration belong to the final treatment and disposal methods, but they are prone to secondary pollution and difficult to control; the method of processing feed is controversial becau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L5/44C10L5/46
CPCC10L5/46C10L5/442C10L5/445C10L5/447C10L2290/26C10L2290/545Y02E50/10Y02E50/30
Inventor 成珊罗睿田红尹艳山
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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