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Multiphase dynamic catalytic oxidation combustion method of novel dry-process rotary kiln pulverized coal

A technology of catalytic oxidation and combustion method, which is applied in the direction of combustion method, combustion using catalytic materials, combustion type, etc., can solve the problems of not being able to meet the requirements of high-yield and high-quality survival competition of new type dry process rotary kilns

Active Publication Date: 2011-06-15
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing pulverized coal combustion technology and catalytic combustion method can no longer meet the survival and competition requirements of high-yield, high-quality and low coal-burning cost of the new dry-process rotary kiln, and new combustion technology methods are urgently needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Hunan Huazhong No. 2 Plant, built in 1938, formed a 1200t / d dry kiln rotary kiln line (Φ3×47m) after several technical transformations. Due to the system equipment, the raw material input has been fluctuating at about 55t / h In the kiln system, due to incomplete combustion of pulverized coal, heavy reducing atmosphere, severe kiln skin and ring formation in the kiln, unstable kiln conditions, high coal consumption, low clinker weight rise of only 1050-1200, and high fCaO, 28d is about 55MPa on average, and some reach 62MPa. At the end of March 2009, the production test of multiphase dynamic catalytic oxidation combustion technology of pulverized coal was carried out. The average amount of catalyst used was 0.3%. Without increasing the amount of coal input, the raw material input was increased from 55t / h to 75t / h, that is, the production The amount of feedstock increased by about 36%, the coal consumption did not increase, the coal saving was about 36%, the CO ...

Embodiment 2

[0031] Example 2: A 2500t / d line of a factory was put into operation in 2005, using bituminous coal: anthracite 1:1, the actual output reached 2700t / d, the clinker silicon rate was 2.2-2.48, the total liquid phase was 29-30.5%, and the weight increase was 1180 ~1300, 3d monthly average 32.3MPa, 28d monthly average 51.7MPa, highest 63MPa. According to the introduction, the main problems are: undercooked, high silicon rate, poor cement fluidity, unable to fulfill the supply contract of 500,000 tons of high-speed railway. At the beginning of 2009, the introduction of high-speed rail formula from a factory in Zhejiang still could not solve the fluidity problem (due to the reducing atmosphere C 4 AF→C 3 A+CF). At the end of March 2009, the test of pulverized coal catalytic oxidation combustion technology was carried out. The average amount of catalyst used was 2.89%, the clinker silicon rate increased to 2.6-2.8, the amount of raw material input remained unchanged, the total amou...

Embodiment 3

[0032] Example 3: A production line with a daily output of 2500t / d was put into operation in May 2008. The designed raw material feeding volume was 150t / h, and the designed heat consumption was 800×4.18KJ / kg. The amount fluctuates between 90-110t / h, and the actual heat consumption is 1130×4.18KJ / kg on average. The kiln system is difficult to produce stably due to the non-stop skinning and inner kiln skinning, kiln eggs, and ringing. Many, the clinker strength fluctuates greatly. On April 17, 2009, the coal powder heterogeneous dynamic catalytic oxidation combustion technology test was carried out. The catalyst dosage was adjusted at 0.2-0.4%, and the production feeding volume was raised to 150t / h on April 18th, and the feeding volume can now be stabilized at 150-153t / h, the actual heat consumption of clinker is estimated to be 783×4.18KJ / kg. The phenomenon of long kiln egg knotting in the kiln completely disappeared, and only a small amount of auxiliary kiln skin fell off wi...

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Abstract

The invention discloses a multiphase dynamic catalytic oxidation combustion method for dry-process rotary kiln pulverized coal. Nanoscale molecular multiplex catalyst precursor is continuously added into kiln head pulverized coal in a liquid state mode; multiphase dynamic high-temperature flame catalytic oxidation combustion is carried out in the kiln; parts of nanoscale functional metallic oxide catalyst formed by the high-temperature flame section enter the coal, material and wind suspension system in the decomposing furnace by pulling wind; and catalytic oxidation combustion is carried out again. The waste functional metal ion oxide serves as high-efficiency ion-type sintering aid in the kiln to accelerate C3S in the cement clinker to be generated and reduce fCaO. According to the invention, two bundles of fire of a dry-process kiln are burned, clinker sintering thermal loss is effectively lowered, clinker quality and kiln yield are improved, the discharge value of CO2 and CO are reduced, thus saving energy and reducing emission, as well as lowering cost.

Description

Technical field: [0001] The invention belongs to the technical field of dry-process rotary kiln pulverized coal combustion. Background technique: [0002] As we all know, coal is a fossil fuel and a complex organic polymer compound. Due to different coal-forming plants, ore-forming conditions, and coalification degrees, its lithofacies composition varies greatly, and its reactivity, ignition temperature, and burnout time vary greatly. . The static ignition temperature of high-quality bituminous coal is 400-500 °C, the static ignition temperature of anthracite is 600-700 °C, and the ignition temperature in the air flow is generally higher by 150-200 °C; the burnout time depends on fineness, temperature, ash content, etc. Some experiments have shown that the particle size of bituminous coal is 80 μm, 100 μm, and 200 μm, and its burnout time at 900 ° C is 0.67 s, 0.97 s, and 3 s, and at 1500 ° C, the burnout time is 0.48 s, 0.57 s, and 2.1 s, respectively. s; the combustion o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23C13/00F23C13/08
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司
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