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Method for producing and using calcium based rare earth composite catalyst for accelerating pulverized coal burning

A rare earth composite and production method technology is applied in the production and application fields of calcium-based rare earth composite catalysts, which can solve the problems of difficult recovery and regeneration of coal-fired catalysts, and achieve the effects of good catalytic combustion-supporting effect, less dosage and simple production process.

Inactive Publication Date: 2009-07-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But CeO 2 Belonging to a rare resource, it is difficult to recycle and regenerate as a coal-fired catalyst

Method used

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  • Method for producing and using calcium based rare earth composite catalyst for accelerating pulverized coal burning
  • Method for producing and using calcium based rare earth composite catalyst for accelerating pulverized coal burning
  • Method for producing and using calcium based rare earth composite catalyst for accelerating pulverized coal burning

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Effect test

Embodiment 1

[0022] The laboratory uses stainless steel as a reactor, adds 10 liters of water, and continuously adds chemical reagent CaO powder under stirring conditions until CaO no longer dissolves. The undissolved particles were then removed with filter paper to obtain Ca(OH) 2 saturated aqueous solution. Ca(OH) 2 Saturated aqueous solution is added to a vertical columnar glass reactor with a diameter of 100mm and a height of 1500mm, and CO is bubbled in at a rate of 500mL / min from a position 400mm from the bottom of the reactor. 2 Bubble until no new sediment is formed. After standing and settling for about 2 hours, the supernatant of the reactor was sucked off (the laboratory did not recycle), and the remaining slurry was added to a solution containing 3g nano-CeO 2 The suspension slurry was stirred for 30 minutes, and then spray-dried, and the spray-drying temperature was set at 250°C. The above process obtained CaCO 3 Negative CeO 2 Add 0.15 g of Lewis acid to 19 g of the pow...

Embodiment 2

[0027] Using the catalyst production method of the present invention, an industrial production line has been established to produce nano-micron CaCO 3 Negative CeO 2 The calcium-based rare earth composite catalyst, the main component of which is CaCO 3 76%±1%, CeO 2 20%±0.5%, Ca(HO) 2 2% ± 0.2%, CaO 1.5% ± 0.2%, catalyst particle size D 50 is 2.7 microns, and the surface electronegativity of the catalyst particles is +23ev. The catalyst was applied to blast furnace coal injection to catalyze combustion, and the following test results were obtained:

[0028]1. In a steel plant with a 200 cubic meter blast furnace, the amount of coal injected per ton of iron is about 130kg, the temperature of the hot air is about 1190°C, and the type of coal is anthracite. The plant uses a medium-speed mill for pulverized coal production, and the amount of catalyst added is controlled at 0.5% of the raw coal delivery speed. The catalyst addition method adopts a quantitative screw continuous...

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Abstract

The invention belongs to the field of energy utilization, and relates to a production and application method for a calcium-based rare earth composite catalyst which promotes the combustion of pulverized coal. The invention is suitable for the pulverized coal blowing and burning process of soft coal and hard coal. The invention is characterized in that CaO and nano CeO2 are used as the materials; the CaO is dissolved in water and is carbonized by CO2 to generate nano-micron CaCO3 serosity; then the nano CeO2 is added and is loaded on the nano-micron CaCO3 crystal grains generated by carbonization; the serosity containing CaCO3 loaded with CeO2 is condensed, sprayed and dried to obtain the CaCO3 loaded with CeO2 with a granularity smaller than 10 microns; then Lewis acid is added, and microwave treatment and heating drying treatment are carried out to lead the surface of catalyst grains to be electropositive; the weight ratio of CaCO3 to CeO2 is 1: 0.05 to 1 : 0.3; the adding amount of Lewis acid is 0.5 to 1.0wt percent of the grain powder of nano-micron CaCO3 loaded with nano CeO2. The catalyst has the characteristics of simple production technique, low cost, high activity, little dosage, and no corrosion; moreover, the catalysis combustion-supporting effect is excellent.

Description

technical field [0001] The invention belongs to the field of energy utilization, and relates to a production and application method of a calcium-based rare earth composite catalyst for promoting pulverized coal combustion. Background technique [0002] Pulverized coal injection combustion is an important link in the coal utilization process. Since pulverized coal injection combustion pulverized coal particles stay in the burner for a short time, increasing the combustion speed is of great significance for improving the energy utilization of pulverized coal. Catalytic combustion is one of the effective measures to achieve rapid combustion. The addition of catalysts can reduce the ignition point of pulverized coal and increase the combustion rate. There are usually two types of catalytic combustion aids: liquid and solid. Liquid catalytic combustion aids are inconvenient to store, transport and use, while solid catalytic combustion aids are easy to store, transport and use. A...

Claims

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Application Information

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IPC IPC(8): C10L9/10C21B5/00
CPCY02P10/20
Inventor 郭占成公旭中黎传红林佐华
Owner UNIV OF SCI & TECH BEIJING
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