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System for producing calcium carbide by using biomass fuel

A biomass fuel, calcium carbide technology, applied in the direction of carbide, calcium carbide, etc., can solve the problems of high energy consumption, high pollution, high investment, etc., to achieve the effect of improving utilization rate, high content, and low temperature required for cracking

Active Publication Date: 2014-12-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem of "high investment, high energy consumption and high pollution" in the production of calcium carbide. The inventor creatively talks about the industrialization of the process of producing calcium carbide with biomass fuel, and introduces a circulating fluidized bed reactor and a plasma ignition temperature control device. In the production system, the production efficiency is improved and the stability of production is guaranteed

Method used

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  • System for producing calcium carbide by using biomass fuel
  • System for producing calcium carbide by using biomass fuel

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Embodiment approach 1

[0025] Such as figure 1 Shown, powdery calcium carbonate is sent into calcium carbonate preheater 12 by feeder one 11, and biomass fuel is sent into biomass fuel preheater 22 by feeder two 21; The gas discharged by material fuel preheater 22 and the gas discharged by circulating fluidized bed reactor 42 in the reaction unit are sent to the gas inlet at the bottom of calcium carbonate preheater 12 in the preheating unit by gas compressor one 14; Calcium carbonate is heated Heat to 500-1500, ℃ to pyrolyze the powdered calcium carbonate into calcium oxide; heat the biomass fuel to 280-500, ℃ to pyrolyze the biomass fuel into coke powder. The high-temperature gas generated after biomass fuel preheating passes through the heat exchanger 2 23 and then is sent to the gas inlet at the bottom of the calcium carbonate preheater 12 through the body compression device 1 14, and the high-temperature solid formed after biomass and calcium carbonate preheating passes through the solid Mater...

Embodiment approach 2

[0027] Such as figure 2 As shown, the biomass fuel is sent into the biomass fuel preheater 22 through the feeder two 21, and the biomass fuel is heated to 280-500°C to decompose it into coke; a part of the coke is sent through the feeder one 11 In the calcium carbonate preheater 12, another part of coke is sent to the solid material mixer 33 through the feeder four 32, and the gas produced by the biomass fuel preheater 22 passes through the heat exchanger two 23, together with the oxygen-containing gas Deliver to the bottom of calcium carbonate preheater 12 by gas compression device one 14; ~1500, ℃ decomposes limestone into calcium oxide; calcium oxide is sent to solid material mixer 33 through feeder three 31, and after being fully mixed with coke, it is sent into circulating fluidized bed reactor 42 through feeder five 41 A small amount of oxygen is sent into the circulating fluidized bed reactor 42 through the gas compression device 2 44; part of the coke is burned to he...

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Abstract

The invention relates to a system for producing calcium carbide by using biomass fuel. The system comprises a raw material preheating unit, a solid mixing unit and a reaction unit, wherein the raw material preheating unit comprises a calcium carbonate preheating unit and a biomass fuel preheating unit, and a calcium carbonate preheater and a biomass preheater are provided with plasma ignition temperature control systems; the solid mixing unit comprises two feeders and a solid material mixer; a circulating fluidized bed reactor is adopted as a reactor in the reaction unit. By using the system, the process that the calcium carbide is produced by using the biomass fuel instead of coal is realized, energy consumption and environmental pollution caused by sulfur dioxide discharged in coal combustion are greatly reduced, and the circulating fluidized bed reactor is used as the reactor, so that the utilization rate of raw materials is increased. In addition, the plasma ignition temperature control systems are used as ignition devices in the system, and when the temperature of the reactor and the preheaters is lowered, the ignition devices can automatically ignite, so that the temperature returns to be normal, and a stable production process is effectively guaranteed.

Description

technical field [0001] The invention belongs to the field of calcium carbide production, and in particular relates to a system for producing calcium carbide with biomass fuel. Background technique [0002] Calcium carbide, commonly known as calcium carbide (CaC 2 ), known as the "mother of organic synthesis". At present, it is mainly used in the production of vinyl chloride, vinyl acetate and acrylic series products. In addition, due to the rapid rise of oil prices in recent years, the development of the calcium carbide industry has been further stimulated. The output of calcium carbide in my country has increased from 4.25 million tons in 2002 to 17.3767 million tons in 2011. [0003] The traditional method of producing calcium carbide adopts the fixed bed-electric arc method, using coal and limestone as raw materials, which has high energy consumption and heavy pollution. Moreover, coal, as a non-renewable resource, is gradually being exhausted, and it is imminent to fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/32C01B32/942
Inventor 杨卫民张震焦志伟阎华丁玉梅陈实张栩郁文霞
Owner BEIJING UNIV OF CHEM TECH