Process and system of preparing calcium carbide and ethylene through oxygen/coal injection

A calcium carbide and process technology, applied in the field of coal chemical industry, can solve the problems of uneven heat distribution in the furnace, high cost of calcium carbide, large amount of raw coke, etc., to reduce power consumption and calcium carbide production cycle, reduce calcium carbide production cost, Small footprint effect

Active Publication Date: 2015-12-09
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industrial calcium carbide production mainly adopts the electric arc method, but in the process of calcium carbide preparation, the electric arc cannot act on the periphery of the furnace or the effect is poor, resulting in uneven heat distribution in the furnace, resulting in high power consumption in production, and a large amount of raw material coke. high cost

Method used

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  • Process and system of preparing calcium carbide and ethylene through oxygen/coal injection
  • Process and system of preparing calcium carbide and ethylene through oxygen/coal injection

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A process for preparing calcium carbide and ethylene by oxygen / coal injection, such as figure 1 shown, including the following steps:

[0040] (1) Calcium carbide preparation

[0041] Transport the coke and lime with qualified particle size to the calcium carbide production plant, enter the calcium carbide furnace through the feeder and the furnace material storage hopper, and use the blowing gun installed on the side wall or furnace top of the calcium carbide furnace to spray into the furnace while the arc is being fed. Oxygen / coal powder mixture, the combustion of oxygen and coal powder produces a large amount of heat, wherein the injection amount of oxygen is 95Nm 3 / t of calcium carbide, the input of anthracite powder is 130kg / t of calcium carbide; when the temperature of the molten pool is heated to 2000-2200°C, coke and lime are reduced and melted in the calcium carbide furnace under the action of arc heat, resistance heat and reaction heat Calcium carbide flows...

Embodiment 2

[0056] This example adopts the same process as that of Example 1 to prepare ethylene, the difference is that the heat of the calcium carbide smelting tail gas can be used to raise the temperature of the acetylene hydrogenation reactor before the CO shift reaction. Specifically, a gas-liquid heat exchange unit is set up in the acetylene hydrogenation reaction, and the heat transfer oil in the jacket of the acetylene hydrogenation reactor is exchanged with the tail gas of calcium carbide smelting in the gas-liquid heat exchange unit, and the heat transfer oil heats up after heat exchange. To 140-220 ℃, so as to make full use of the heat in the tail gas of calcium carbide smelting.

Embodiment 3

[0058] A system for realizing the process of preparing calcium carbide and ethylene by oxygen / coal mixed injection described in embodiment 1, such as figure 2 As shown, it includes a calcium carbide preparation unit, an acetylene generating unit, an acetylene hydrogenation reaction unit, and a cryogenic separation unit connected in sequence;

[0059] Among them, a CO conversion decarbonization hydrogen production unit is also included, the inlet of which is connected to the outlet pipe of the calcium carbide smelting tail gas of the calcium carbide preparation unit, and the hydrogen outlet is connected to the pipe of the acetylene hydrogenation reaction unit.

[0060] Wherein, the calcium carbide preparation unit is an electric arc calcium carbide furnace, including a furnace body, a furnace cover, a feed inlet and a calcium carbide furnace gas outlet, wherein, the top wall and / or side wall of the furnace body are embedded with a plurality of vertically adjustable Oxygen / coal...

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Abstract

The invention relates to a process and a system of preparing calcium carbide and ethylene through oxygen / coal injection, wherein the process includes following steps: (1) preparation of calcium carbide; (2) CO conversion and decarburization and hydrogen production; (3) acetylene generation; (4) acetylene hydrogenation reaction; and (5) cryogenic separation. In the invention, oxygen and coal powder are injected during a calcium carbide smelting process. Because that heat generated from incomplete combustion of oxygen and coal can radiate to a position which is difficult to reach by arc light, the process, compared with a conventional calcium carbide furnace method, is more uniform in heat distribution in furnace, thereby reducing electric consumption in the calcium carbide furnace and calcium carbide production period. The injected coal powder can replace a part of coke, so that the process can reduce production cost of the calcium carbide. Meanwhile, the process fully utilizes calcium carbide smelting tail gas being rich in CO, which is used for preparing hydrogen through the CO conversion to prepare the hydrogen source in the acetylene hydrogenation reaction, so that not only is environment pollution reduced but also economic benefit is improved greatly.

Description

technical field [0001] The invention relates to a process and system for preparing calcium carbide and ethylene by oxygen / coal injection, belonging to the technical field of coal chemical industry. Background technique [0002] Ethylene is a major raw material in the petrochemical industry. The current preparation process is mainly the cracking of naphtha to olefins and coal to olefins. In 2015, the total domestic ethylene production capacity will reach about 22 million t / a, and in 2020, the domestic ethylene production capacity will further increase to 32.5 million t / a. It is estimated that the domestic ethylene consumption will be 48 million tons by 2020, and the demand is greater than the production capacity. For our country, which is not rich, it has formed a serious strategic threat. Therefore, seeking another new source and process method to prepare the bulk basic organic chemical raw material-ethylene, and replacing petroleum as a raw material in the field of industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/32C07C11/04C07C5/09C07C7/00C01B32/942
Inventor 史雪君余海鹏车中山邓君吴道洪
Owner SHENWU TECH GRP CO LTD
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