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A process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection

An agricultural and forestry waste, blast furnace coal injection technology, applied in blast furnaces, waste fuels, blast furnace details, etc., can solve the problems of high ash content, not meeting the requirements of blast furnace coal injection, and low calorific value of biochar, achieving low cost and high heat. Improve the performance of blast furnace coal injection technology and the effect of promoting cleaning

Active Publication Date: 2020-08-04
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Although the above reports all studied the preparation of biochar from agricultural and forestry wastes through hydrothermal reaction, the above studies did not involve the basic performance and process of hydrothermal carbonization of agricultural and forestry wastes for blast furnace coal injection, and The calorific value of the biochar produced by it is relatively low, and the ash content is relatively high, which does not meet the requirements for the use of blast furnace coal injection. At present, there is no disclosure of the process of preparing blast furnace coal injection fuel by carbonization of agricultural and forestry waste based on hydrothermal reaction. reported that, therefore, it is necessary to find a suitable process to make agricultural and forestry waste into charcoal that meets the requirements of blast furnace coal injection and use it for blast furnace coal injection

Method used

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  • A process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection
  • A process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection
  • A process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection

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Experimental program
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Embodiment 1

[0037]This embodiment provides a process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection, including the following steps:

[0038] (1) After crushing corn stalks (dry base volatile matter 79.5%, ash content 5.76%, calorific value 17250kJ / kg) to a particle size of less than 1cm, the crushed material is transported to the slurry storage tank through a pipeline, and water is added to the slurry storage tank Stir and mix well to control the moisture content to 60%; and use a high-pressure slurry pump to transport the slurry to a heat exchanger for preheating to 120°C, and then transport the preheated slurry to a high-pressure hydrothermal reaction vessel for hydrothermal carbonization Reaction, control the temperature in the hydrothermal reaction vessel to be 220°C, the corresponding saturated vapor pressure is 2.3MPa, and the hydrothermal carbonization time is 100min to obtain the hydrother...

Embodiment 2～5

[0046] Embodiments 2-5 provide a process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection. Compared with Example 1, the difference is that the water content and the water content of the slurry in step (1) are changed. Preheating temperature, the concrete values ​​of the corresponding slurry moisture content and preheating temperature of each embodiment are as shown in table 1:

[0047] Table 1 Example 2-5 Corresponding slurry moisture content and slurry preheating temperature value

[0048] Example Moisture content of slurry (%) Slurry preheating temperature (°C) Example 2 70 120 Example 3 80 120 Example 4 80 130 Example 5 80 140

[0049] The performance of the hydrothermal charcoal particles and the mixed fuel prepared in each embodiment are tested, and the results are shown in Table 2 and Table 3 respectively:

[0050] The performance of ...

Embodiment 6～9

[0058] Embodiments 6 to 9 provide a process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection. Compared with Example 1, the difference is that the hydrothermal reaction vessel in step (1) is changed. temperature, saturated vapor pressure and hydrothermal carbonization time, the concrete values ​​of hydrothermal carbonization temperature, hydrothermal carbonization pressure and hydrothermal carbonization time corresponding to each embodiment are as shown in table 4:

[0059] Table 4 The corresponding hydrothermal carbonization temperature, hydrothermal carbonization pressure and hydrothermal carbonization time of Examples 6-9

[0060] Example Hydrothermal carbonization temperature (℃) Hydrothermal carbonization pressure (MPa) Hydrothermal carbonization time (min) Example 6 220 2.3 60 Example 7 220 2.3 40 Example 8 280 6.4 60 Example 9 340 14.6...

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Abstract

The invention discloses a hydrothermal-reaction-based process for treating agricultural and forest residues to prepare carbide used for blast furnace coal injection. Hydrothermal reaction technology is utilized for converting the agricultural and forest residues high in volatile content, low in calorific value and low in use value into high-quality hydrothermal carbide low in volatile content, low in ash content and high in calorific value, and the hydrothermal carbide and blast furnace coal injection pulverized coal are mixed to be used so as to achieve application of the agricultural and forest residues to blast furnace coal injection. In this way, the prepared hydrothermal carbide can meet performance index requirements for fuel of blast furnace coal injection and can serve as clean and renewable fuel to partially replace blast furnace coal injection pulverized coal to be used, utilization efficiency of the residues can be improved, emission of carbon dioxide in ironmaking production can also be lowered, and significant economic, social and ecological benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of carbonization, quality improvement and utilization of agricultural and forestry wastes, in particular to a process based on hydrothermal reaction treatment of agricultural and forestry wastes to prepare carbonized products for blast furnace coal injection. Background technique [0002] As a material and energy-intensive industry, the iron and steel industry consumes a lot of raw materials and energy, and discharges a lot of pollutants, and most of the energy consumption and pollution come from the ironmaking process. The focus of the plan is to reduce energy consumption and pollutant emissions in the ironmaking process, and pulverized coal injection in blast furnaces is one of the important means to improve the energy structure of ironmaking, optimize blast furnace production, and promote energy conservation and emission reduction in ironmaking processes. However, the pulverized coal used in blast furnace...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B5/00C10L5/44
CPCC10L5/447C21B5/003Y02E50/10Y02E50/30Y02P10/20
Inventor 王广伟王川张建良
Owner UNIV OF SCI & TECH BEIJING
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