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Hydrothermal reaction based method for dealkalization and carbonization of agricultural and forestry waste

A technology of agricultural and forestry waste and hydrothermal reaction, applied in the field of dealkalization and carbonization of agricultural and forestry waste based on hydrothermal reaction, can solve the problems of insufficient use of heat and other by-products, high alkali metal content, waste of resources, etc., to achieve Reduce the heat consumption of evaporation and gasification, the overall energy consumption is low, and the cost is low

Active Publication Date: 2019-10-22
UNIV OF SCI & TECH BEIJING
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent with the publication number CN105602646A discloses a method for producing biomass barbecue charcoal by hydrothermal carbonization. It adopts the process of hydrothermal carbonization and then compression molding to produce a pure biomass barbecue charcoal that is clean and less ash; but the method mainly Focusing on increasing the calorific value of carbonization products without controlling the content of alkali metals leads to high content of alkali metals in carbonization products. At the same time, in the process of hydrothermal carbonization, the generated heat and other by-products are not fully utilized. caused a certain waste of resources
[0005] At the same time, in the process of hydrothermal reaction, due to the diversification of raw materials and preparation processes and methods, the performance parameters of the prepared hydrothermal carbon such as ash, volatile matter, calorific value and alkali metal content are very different, making the products have different characteristics. properties and uses, forming a variety of hydrothermal carbon products, but there is still a lack of a high-quality hydrothermal carbon with high calorific value and low alkali metal content at the same time, it is necessary to study its preparation method

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  • Hydrothermal reaction based method for dealkalization and carbonization of agricultural and forestry waste
  • Hydrothermal reaction based method for dealkalization and carbonization of agricultural and forestry waste
  • Hydrothermal reaction based method for dealkalization and carbonization of agricultural and forestry waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example provides a hydrothermal reaction-based dealkalization carbonization method for agricultural and forestry waste. Taking corn stalks as an example, the dealkalization carbonization process is as follows: figure 1 shown, including the following steps:

[0034] (1) Pretreatment of agricultural and forestry waste: crush corn stalks so that the particle size after crushing is less than 1cm, transport the crushed corn stalks to the pulping tank through pipelines, and feed the crushed corn stalks in the pulping tank Add an aqueous solution with a pH value of 6 mixed by industrial water, desalted water and acid waste liquid from a chemical plant as pulping water, stir and mix to obtain a slurry, and control the moisture content of the slurry to 80%;

[0035] (2) Slurry preheating treatment: After the prepared agricultural and forestry waste slurry is pressurized by a high-pressure slurry pump, it is transported to a heat exchanger through a pipeline for preheating. ...

Embodiment 2～5

[0043] Embodiments 2 to 5 provide a method for dealkalization and carbonization of agricultural and forestry wastes based on hydrothermal reaction. Compared with Example 1, the difference is that the pH value and slurry moisture content of pulping water in step (1) are changed , the specific values ​​of the pH value of the pulping water corresponding to each embodiment and the water content of the slurry are shown in Table 1:

[0044] The pH value of the pulping water corresponding to Table 1 Embodiment 2~5 and the slurry moisture content

[0045] Example pH value of pulping water Moisture content of slurry (%) Example 2 4 80 Example 3 2 80 Example 4 2 70 Example 5 2 60

[0046] The hydrothermal charcoal prepared in each embodiment is tested, and the results are shown in Table 2:

[0047] The performance of the hydrothermal charcoal that step (5) makes in the embodiment 2~5 of table 2

[0048]

[0049]

[0050] It can be se...

Embodiment 6～13

[0052] Embodiments 6 to 13 provide a method for dealkalization of agricultural and forestry wastes based on hydrothermal reaction. Compared with Example 3, the difference is that the working temperature, Saturated vapor pressure and treatment time, the specific values ​​of working temperature, saturated vapor pressure and treatment time in the hydrothermal carbonization reactor corresponding to each embodiment are shown in Table 3:

[0053] Table 3 Working temperature, saturated vapor pressure and treatment time in the hydrothermal carbonization reactor corresponding to Examples 6-13

[0054]

[0055]

[0056] The hydrothermal charcoal prepared in each embodiment is tested, and the results are as shown in table 4:

[0057] The performance of the hydrothermal charcoal that step (5) makes in the embodiment 6~13 of table 4

[0058]

[0059] It can be seen from Table 4 that the alkali metal content of the hydrothermal charcoal prepared in Examples 6-13 is between 0.05% a...

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Abstract

The invention discloses a hydrothermal reaction based method for dealkalization and carbonization of agricultural and forestry waste. The method includes: agricultural and forestry waste pretreatment,slurry preheating treatment, hydrothermal dealkalization and carbonization, solid-liquid separation treatment, dehydration and drying treatment, waste heat recycling and dealkalized water recycling.By controlling the raw materials and reaction conditions of hydrothermal reaction, low utilization value agricultural and forestry waste with low calorific value and high alkali metal content can be converted to high quality hydrothermal carbon with high calorific value and low alkali metal content. Also through reuse of the waste heat and by-products in the reaction, the energy consumption is reduced, the resource utilization rate is improved, and environmental pollution is reduced. The whole treatment process has high efficiency and low energy consumption, and the prepared hydrothermal carbon can be used as a high-quality clean fuel, thus improving the utility value of agricultural and forestry waste. Therefore, the method has positive economic and ecological significance.

Description

technical field [0001] The invention relates to the technical field of utilization of agricultural and forestry wastes, in particular to a dealkalization carbonization method of agricultural and forestry wastes based on hydrothermal reaction. Background technique [0002] Agricultural and forestry waste is a by-product produced in the process of production and processing of agriculture and forestry industries. It is huge in quantity and various in variety. Moreover, with the rapid development of agricultural economy and the continuous advancement of science and technology, the yield of crops continues to increase, and agricultural product processing The rapid development of the industry has led to a continuous increase in the amount of various agricultural and forestry wastes. However, due to the limitations of technology, tradition and concepts, the current utilization rate of agricultural and forestry wastes is still relatively low. As a renewable biomass energy, agricultu...

Claims

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Application Information

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IPC IPC(8): C10L5/44C10B53/02C10G1/00
CPCC10B53/02C10G1/002C10G2300/1011C10L5/447Y02E50/10Y02E50/30Y02P20/129
Inventor 王广伟王川张建良邵久刚
Owner UNIV OF SCI & TECH BEIJING
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