RU1819907C - Apparatus for decomposition of hydrocarbons in a liquid heat carrier - Google Patents

Abstract

Usage: in the petrochemical and chemical industries for the pyrolysis of hydrocarbons in molten inorganic salts or metals. SUMMARY OF THE INVENTION: the device comprises a heating furnace with tubes for the coolant divided by a vertical partition into radiant and convective parts, a reaction tube equipped with hydrocarbon feed means in the lower part, separators connected by a V-shaped water trap, and an overflow pipe. a vertical contact heat exchanger including a reaction tube, the elbow of the V-shaped water trap is provided with oxidizer input means, which allows increasing l time continuous operation of the device. 1 il ate

Description

The invention relates to the petrochemical and chemical industries and can be used for the pyrolysis of hydrocarbon raw materials in molten inorganic salts or metals

A device is known that comprises a heating furnace with vertical transfer pipes for liquid metal-coolant placed in it, provided at the bottom with means for supplying hydrocarbons to the reaction pipes, a separation chamber installed above the furnace and connected to the reaction and transfer pipes and equipped with a pipe for product removal decomposition of hydrocarbons 1.

The disadvantage of this device is the accumulation of coke in the circulating

melt of the coolant, which leads to the need to stop the device for removing coke

Closest to the present invention is a device for the decomposition of hydrocarbons in a liquid coolant, comprising a heating furnace divided by a vertical partition into radiant and convective parts with coolant tubes, a reaction tube provided at the bottom with a means for supplying hydrocarbons, connected by a V-shaped .: separators, transfer pipe 2,

The disadvantages of the device are coke deposition on the inner walls of the reaction tubes in the radiant zone from the thermal effect of the burners on the metal walls of the reaction tubes and

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poor circulation of the melt of the liquid coolant from the airlift action of the oxidizing gas and combustion products of coke directed towards the flow of the liquid coolant in the transfer pipe

The purpose of the invention is to increase the continuous operation time of the device

The drawing shows a diagram of the proposed device

The device comprises a heating furnace 1 with radiant 2 and convective 3 pipes placed in it. The vertical reactor A / is made outside the furnace and has a hydrocarbon inlet means 5 at the bottom. The reactor outlet is connected to a separator, a chamber 6 for cleaning the pyrolysis products from liquid heat carriers. 6 by means of a V-shaped water seal j consisting of a pipe 9 with an oxidizer 10 input device and a pipe 11 “In the upper part of the chamber 8 there are a drop eliminator 12 and a coolant inlet pipe 13

The device operates as follows. .;

8 heated liquid coolant in radiant and convective pipes using an oxidizing agent (air, a mixture of nitrogen and oxygen) 10; an oxidizing agent is supplied to a pipe 9, a knee-shaped hydraulic seal, and a separator chamber 8 with an oxidizing pressure elevator; - chamber 8 - convection pipes 3 - alternative pipes 2 - reactor - separator chamber 6 - water trap pipes 11, 9 - chamber 8р

In reactor k, hydrocarbon feed is introduced through means 5 for introducing hydrocarbons, which is subjected to temperature pyrolysis in a bubble or film mode. In the chamber b, the leaked pyrolysis products are separated from the heat-transfer fluid and removed through the droplet separator 7 for cooling and separation. in a liquid melt the heat carrier creates its associated movement

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burning and overflow into the pipe 11, which captures the subsidized coke. In pipe 9, suspended coke is burned with an oxidizing agent. The movement of the oxidizing agent and coke combustion products creates a passing movement of the heat carrier into the chamber 8, from where the heat carrier moves into convection tubes, and the products of coke oxidation / through the droplet eliminator 12 are removed from the separator. The coolant flow rate is replenished through the nozzle 13 °

An increase in the time of continuous operation of the device is achieved by reducing coke deposits on the walls of the reactor due to the fact that the heat source of the pyrolysis is the liquid coolant and the formation of suspended coke occurs only on the contact heat exchange surface of the liquid coolant with hydrocarbon feedstock, and the reactor wall is stored. from coke deposition, since it has a direction of heat flow from the liquid coolant to the wall 0 N

The intensification of the circulation of liquid coolant is comprehended. account of the airlift head of the oxidizing agent and the products of coke combustion in the water trap pipe, enhancing the associated movement of the coolant melt

Forumula and

A device for the decomposition of hydrocarbons in a liquid coolant, comprising a heating furnace divided by a vertical partition into a radiant and convective part. heat transfer pipes, a reaction pipe provided at the bottom with a means for supplying hydrocarbons, V-shaped water trap separators, an overflow pipe, about t-: l and ch and yu. e-e with the fact that, with. In order to increase the continuous operation time of the device, it is equipped with a vertical contact heat exchanger located outside the heating furnace, including a reaction tube, and the elbow U of the shaped water seal is provided with oxidizing agent input means. ; . :. .-...:

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