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Method for preparing calcium carbide and synthesis gas through thermal oxidation reaction and calcium carbide reactor

A reactor and synthesis gas technology, which is applied in the direction of granular/powder fuel gasification, carbide, calcium carbide, etc., can solve the problems of low CO content in by-products, increase operating costs, increase process steps, etc., and achieve by-products The effect of large gas volume, small investment and simple process

Active Publication Date: 2011-08-17
WUHUAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the required high temperature above 1700°C in the reactor, the amount of oxygen and carbon consumed is still relatively large; from the configuration of each device in the production system, the production of calcium carbide by the oxythermal method involves many equipment, large investment, and difficult process. More complex, with less by-product CO
Due to the small amount of by-produced CO, it is not suitable for use as raw material gas for chemical plants; and the process ideas of CO return and oxygen combustion preheating raw materials seem to achieve the purpose of product recycling, but actually increase the process Steps, issues that increase operating costs

Method used

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  • Method for preparing calcium carbide and synthesis gas through thermal oxidation reaction and calcium carbide reactor
  • Method for preparing calcium carbide and synthesis gas through thermal oxidation reaction and calcium carbide reactor
  • Method for preparing calcium carbide and synthesis gas through thermal oxidation reaction and calcium carbide reactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The weight ratio of raw materials: pulverized coal: calcium carbonate is 2.2:1, and the particle size is 0.15mm.

[0041] One third of the weight of the above-mentioned raw materials is put into the closed reaction furnace 2 from the first feeding port 6 through the screw pressurized feeder, and the remaining two thirds are fed by the pressurized feeder from the second feeding port 18. Put into closed reaction furnace 2 (the carrier gas temperature of this part of the material is 200 ° C, which is the part of the chilled CO gas separated by the gas-solid separator), and the control feeding speed is 7m / s and the pressure is 2.0MPa, Calcium carbonate is decomposed into calcium oxide and CO at high temperature (above 600°C) in preheating chamber 3 2 At the same time, part of the pulverized coal also interacts with the CO in the preheating chamber 3 2 An endothermic reaction occurs to generate CO, and the remaining part of pulverized coal and calcium oxide are combined wit...

Embodiment 2

[0043] The weight ratio of raw materials: blue carbon: calcium oxide is 2.5:1, and the particle size is 0.25mm.

[0044] The above-mentioned raw materials are put into the closed reaction furnace 2 through the first feeding port 6 and the second feeding port 18 respectively through the screw press feeder, and half of the total weight of the raw materials is added from the first feeding port 6. , the rest is added from the second feed port 18, (the temperature of the carrier gas of this part of the material is 220 ° C), the control feeding speed is 10m / s, the pressure is 4.0MPa, part of the blue carbon and the CO in the preheating chamber 3 2 An endothermic reaction occurs to generate CO, and the remaining blue carbon and calcium oxide are combined with the high-temperature CO and CO from the gasification chamber 4 and the reaction chamber 5 in the preheating chamber. 2 After the contact heat exchange is carried out, they descend into the gasification chamber together; Every 1...

Embodiment 3

[0046] The weight ratio of raw materials: pulverized coal: calcium oxide is 3:1, and the particle size is not more than 0.45mm.

[0047] The above-mentioned raw materials are put into the closed reaction furnace 2 from the first feeding port 6 and the second feeding port 18 through the screw pressurized feeder, and a quarter of the total weight of the raw materials is added from the first feeding port 6, and the remaining Part of it is added from the second feed port 18 (the carrier gas temperature of this part of the material is 210 ° C), the feeding speed is controlled to be 10 m / s, the pressure is 1.5 MPa, and the weight of pure oxygen and pulverized coal injected into the oxygen burner The mixture with a ratio of 0.5:1 was injected at a speed of 250 m / s, and the rest were the same as those in Example 1. The purity of 0.348 tons of calcium carbide generated per 1 ton of raw coal is 56%, and the amount of synthesis gas is 1500 liters / kg.

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Abstract

The invention discloses a method for preparing calcium carbide and a synthesis gas through a thermal oxidation reaction and a calcium carbide reactor, which solve the problems of great raw material consumption, more equipment, large investment, complex process, less CO byproduct quantity and difficult industrial application of the traditional calcium carbide preparation method. The calcium carbide reactor comprises a gas-solid separator, a closed reacting furnace is arranged below the gas-solid separator, and the closed reacting furnace comprises an upper preheating chamber, a middle vaporizing chamber and a lower reaction chamber. In the method provided by the invention, a special calcium carbide reactor is adopted; when calcium carbide is synthesized, a large amount of produced CO can be industrially applied; and thus, the method has low production and operation costs, low energy consumption, great by-product gas quantity and a broad market prospect.

Description

technical field [0001] The invention relates to a method and special equipment for preparing calcium carbide and synthesis gas, in particular to a method and a calcium carbide reactor for preparing calcium carbide and synthesis gas by oxythermal reaction. Background technique [0002] Calcium carbide is a basic organic chemical raw material, and the acetylene gas obtained from it can replace petroleum products to produce thousands of organic products such as acetic acid, polyvinyl chloride, vinyl acetate, polyvinyl alcohol, acetylene ether, acetylene carbon black, etc. Therefore, it has a wide range of uses, and it is foreseeable that the market demand for calcium carbide will continue to rise. [0003] There are two production methods of calcium carbide: oxythermal method and electrothermal method. At present, electrothermal method is generally used to produce calcium carbide in industry, that is, coke (C) and calcium oxide (CaO) are in a calcium carbide furnace, and a fixe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C10J3/46C10J3/48C01B32/942
Inventor 徐才福陈雪枫徐建民李伍成杨建国张秀全张宗飞刘宏建张志华杨小林
Owner WUHUAN ENG
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