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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, applied in the direction of granular/powdered fuel gasification, carbide, calcium carbide, etc., can solve the problems of less by-product CO, increase process steps, increase operating costs, etc., to achieve by-product The effect of large gas volume, simple process and small investment

Active Publication Date: 2013-10-16
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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0041] Put one-third of the weight of the raw materials into the closed reaction furnace 2 through the first feed port 6 through the screw pressurized feeder, and the remaining two-thirds are fed through the second feed port 18 by the pressurized feeder. Throw it into the closed reaction furnace 2 (the carrier gas temperature of this part of the material is 200 ° C, which is part of the chilled CO gas separated by the gas-solid separator), the feed rate is controlled to be 7m / s, and the pressure is 2.0MPa. Calcium carbonate is decomposed into calcium oxide and CO at high temperature (above 600°C) in the preheating chamber 2 , while part of the pulverized coal is also mixed 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 mixed with high-temperature CO and CO...

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 pressurized feeder, and 1 / 2 of the total weight of the raw materials is added through the first feeding port 6 , the rest is added by the second feed port 18, (the carrier gas temperature of this part of the material is 220 ℃), the control feed rate 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 mixed with high-temperature CO and CO from the gasification chamber 4 and the reaction chamber 5 in the preheating chamber 2 After carrying out contact heat exchange, descend together and enter the gasification chamber; the injection speed of the pure...

Embodiment 3

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

[0047] The above-mentioned raw materials are dropped into the closed reaction furnace 2 by the first feed port 6 and the second feed port 18 through the screw pressure feeder, and 1 / 4 of the total weight of the raw materials is added by the first feed 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 feed speed is controlled to be 10m / s, the pressure is 1.5MPa, and the oxygen burner injects the weight of pure oxygen and coal powder. Ratio is the mixture of 0.5: 1, and injection velocity is 250m / s, all the other are the same as embodiment 1. The purity of 0.348 tons of calcium carbide produced per 1 ton of raw coal is 56%, and the amount of synthetic 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 for preparing calcium carbide and synthesis gas and special equipment thereof, in particular to a method for preparing calcium carbide and synthesis gas by oxythermal reaction and a calcium carbide reactor. Background technique [0002] Calcium carbide is a basic organic chemical raw material. Acetylene gas produced from it can replace petroleum products to produce thousands of organic products such as acetic acid, polyvinyl chloride, vinyl acetate, polyvinyl alcohol, acetylene ether, and acetylene carbon black. 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: aerobic heating method and electrothermal method. At present, electrothermal method is generally used in industry to produce calcium carbide, that is, coke (C) and calcium oxide (CaO) are placed in a calcium carbide furnace,...

Claims

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Application Information

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Patent Type & Authority Patents(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