Method and device for producing sodium cyanide through mixed pyrolysis of ammonia, light oil and natural gas

Abstract

The invention belongs to the technical field of energy saving and environmental protection, and particularly provides a method and device for producing sodium cyanide through mixed pyrolysis of ammonia, light oil and natural gas. After the ammonia, the light oil and the natural gas are mixed according to a certain ratio and preheated, with scorched particles as conductive carriers, under the discharge action of pyrolysis electricity, a pyrolysis reaction is carried out to generate hydrogen cyanide gas, the hydrogen cyanide gas is absorbed by alkali liquid to generate the sodium cyanide, and hydrogen-containing tail gas is recovered after being subjected to dehydrogenation and deamination. According to the method and device for producing the sodium cyanide through mixed pyrolysis of the ammonia, the light oil and the natural gas, the natural gas and the light oil are mixed, an obtained mixture and the ammonia are subjected to pyrolysis to generate the sodium cyanide, the effect is significant, a system is made to be stable, and the production cost of the sodium cyanide is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of energy saving and environmental protection, and in particular provides a method and a device for producing sodium cyanide by mixed cracking of ammonia, light oil and natural gas. Background technique [0002] In the process of producing sodium cyanide by traditional cracking method, the main steps are: vaporization of raw materials, vaporization of liquid ammonia, mixing of raw materials and ammonia gas, preheating, high temperature cracking of the mixed gas in the cracking furnace to produce hydrogen cyanide gas, hydrogen cyanide gas after replacement Heat, dust removal, filtration, and alkali absorption produce 30% sodium cyanide. [0003] The main raw materials for producing sodium cyanide by cracking method are: light oil, pentane and natural gas. Light oil has the advantages of convenient procurement and stable prices. Pentane has the advantages of stable composition and less power consumption. Na...

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Problems solved by technology

However, in winter, there are cases where purchasing is difficult such as price increases or insufficient supply.

The composition and price of natural gas are relatively stable, and it is convenient to purchase. However, due to the large gas expansion coefficient of natural gas, when passing through the flower board, there will be a large scouring force on the flower board, and the bond breaking temperature of methane, the main component of natural gas, is higher. High (1910°C), a large amount of heat is generated by the discharge between the graphite electrode and the graphite flower plate. The high temperature will cause the eye to expand and become thinner for a long time, which will increase the consumption of the flower plate. The consumption of pyrolysis electricity, that is, there are following deficiencies in the existing technology:

[0005] (1) Using light oil as a raw material, because the composition is unstable, it will lead to unstable product quality, and in severe cases, it will cause shutdown and affect production

[0006] (2) Using pentane as a raw material, there will be difficulties in purchasing and the risk of increased finished products in winter

[0007] (3) Using natural gas as raw material increases the consumption of electric energy and flower boards

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