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Method for preparing coking raw material through biomass hydrothermal carbonization treatment and application of coking raw material prepared by method to coking production

A hydrothermal carbonization and biomass technology, applied in the field of renewable energy utilization and coking, can solve the problems of low strength, impact on application, and high coke reactivity, and achieve the effects of excellent performance, low energy consumption and cost, and uniform and stable performance.

Pending Publication Date: 2020-11-24
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high content of alkali metal oxides (K 2 O and Na 2 O), resulting in the coke prepared with high reactivity, low strength after reaction, etc., seriously affecting its application in blast furnace smelting production

Method used

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  • Method for preparing coking raw material through biomass hydrothermal carbonization treatment and application of coking raw material prepared by method to coking production
  • Method for preparing coking raw material through biomass hydrothermal carbonization treatment and application of coking raw material prepared by method to coking production
  • Method for preparing coking raw material through biomass hydrothermal carbonization treatment and application of coking raw material prepared by method to coking production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A method for preparing coking raw materials by hydrothermal carbonization of biomass, taking corn stalks from agricultural production as biomass raw materials as an example, comprising the following steps:

[0049] (1) The collected corn stalks are crushed into fragments with a particle size of less than 5mm by using a shearing mill. Mix the shredded corn stalks and coking waste water at a ratio of 2:1kg / L and add them into the autoclave; start heating after sealing the autoclave, start timing when the temperature rises to 160°C, and stop heating after 4 hours of reaction; temperature When the temperature drops to 60°C, the reactor is opened, and the reactant is transferred to the solid-liquid separation device to separate the solid product from the liquid product to obtain corn straw hydrothermal charcoal. The liquid phase product is deoiled, desalted and purified, and the remaining waste water is recycled; After the corn stalk hydrothermal charcoal was dried, the comp...

Embodiment 2～5

[0056] Embodiments 2 to 5 provide a method for preparing coking raw materials by hydrothermal carbonization of biomass. Compared with Example 1, the difference lies in the solid-to-liquid ratio of corn stalks and coking wastewater, the hydrothermal carbonization temperature, and the hydrothermal carbonization The time is shown in Table 1. Other preparation methods and application methods in coking production are roughly the same as in Example 1, and are not repeated here.

[0057] The preparation conditions of table 1 embodiment 2~5 and the technical index of the hydrothermal charcoal of preparation

[0058]

[0059] Coke performance prepared by table 2 embodiment 2~5

[0060] Example Volatile matter (%) Ash (%) CRI(%) CSR(%) M40(％) M10(％) Example 2 1.3 9.6 27.6 58.2 82.9 11.1 Example 3 1.2 9.3 27.3 59.2 83.2 10.9 Example 4 1.2 9.4 27.2 59.3 83.3 10.9 Example 5 1.1 9.1 26.9 60.3 84.6 10.5

[0061] It can ...

Embodiment 6～15

[0064] Compared with Example 1, the method for preparing coking raw materials by hydrothermal carbonization of biomass provided in Examples 6 to 15 is different in that the moisture content in the coking raw materials, the amount of corn stalk hydrothermal charcoal in the mixed coal (hydrothermal charcoal The mass content in the sum of blended coal), the volatile content and ash content of blended coal are shown in Table 3. Other preparation methods and application methods in coking production are roughly the same as in Example 1, and are not repeated here.

[0065] The preparation parameter of table 3 embodiment 6~15

[0066] Example Hydrothermal carbon content (%) Blended coal volatile matter (%) Mixed coal ash (%) Coking raw material moisture (%) Example 6 20 25.0 9.0 12.0 Example 7 17.5 25.0 9.0 12.0 Example 8 14.8 28.3 7.8 10.1 Example 9 12.6 28.3 7.8 10.1 Example 10 9.5 31.1 6.3 8.3 Example 11 6.8 31.1...

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Abstract

The invention provides a method for preparing a coking raw material through biomass hydrothermal carbonization treatment and application of the coking raw material prepared by the method to coking production. According to the method, firstly, crushed biomass is subjected to hydrothermal carbonization treatment; by controlling the hydrothermal carbonization temperature and time, high-quality biomass hydrothermal carbon with the low ash content, the low alkali metal content, the high fixed carbon content and the proper water content is obtained, so that the performance of the biomass hydrothermal carbon meets the quality requirement of coking production; then, the biomass hydrothermal carbon and base coal are mixed, a proper amount of water is added for uniform mixing, and the coking raw material is obtained; and the water content in the coking raw material is regulated and controlled to be 6 to 12 percent, and the coking production is performed. On the premise that the mechanical strength and the reaction performance of the produced coke are enabled to meet the blast furnace ironmaking requirement, the goals of realizing resource utilization of the biomass, reducing the coking cost,saving coking coal resources and reducing CO2 and pollutant emission are also achieved; and good environmental and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of renewable energy utilization and coking, and in particular relates to a method for preparing coking raw materials by hydrothermal carbonization of biomass and its application in coking production. Background technique [0002] China is the country with the largest steel production and consumption in the world. In 2018, the crude steel production exceeded 900 million tons, accounting for more than 50% of the world's crude steel production. Therefore, reducing coke consumption in blast furnace ironmaking and expanding coking coal resources have become the focus of coking and ironmaking workers. As a traditional large agricultural country, my country is rich in biological resources. The annual output of agricultural straw biomass resources alone exceeds 700 million tons, equivalent to about 350 million tons of standard coal. Compared with traditional coal and other fossil fuels, biomass is a renewable clean...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02C10B53/04C10B57/00C10B57/02
CPCC10B53/02C10B53/04C10B57/00C10B57/02Y02E50/10
Inventor 王广伟王川张建良宁晓钧邵久刚
Owner UNIV OF SCI & TECH BEIJING
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