SU1221227A1 - Method of hardening products of thermal cracking - Google Patents

Description

1221227

The method according to claim 1, about tl and h and Yu-. with the fact that as a thermos in

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The invention relates to the thermal processing of solid and liquid fuels, and more specifically to methods of quenching the thermal cracking products of hydrocarbon raw materials.

There is a known method for quenching products of thermal cracking of hydrocarbon feedstock, which includes supplying them together with blown solid coolant, for example coke, to the upper part of the quenching device, axial coolant supply, axial withdrawal of thermal decomposition products and captured solid coolant ij.

The disadvantage of this method is that the particles of the solid heat transfer medium, falling on the walls of the quenching device, become centers of coke formation. as a result of the coking of the walls of the quenching device, its working volume is constantly changing, which significantly impairs the quenching process and necessitates frequent stops to clean the quenching device.

Closest to the essentially proposed and achieved result is a method of quenching the products of thermal cracking of hydrocarbon feedstock carried out in the presence of solid coolant, including feeding them together with blown solid coolant, for example coke, to the upper part of the quenching device, axial coolant supply , supply of thermostable liquid (metal melt) -po. The walls of the quenching device and the axial removal of thermal decomposition products, a thermostable liquid and captured solid heat carrier, l 2.

The disadvantage of the known method is that the density of the molten metal is much higher than the density of the hardness p of the heat transfer fluid and, therefore, the particles are not captured by the melt, and hydrocarbon feedstocks with boil float on its surface stable liquid. 350-500 s.

tee or fly off of it. Therefore, the effective separation of the products of thermal decomposition and melt, and the latter from particles of solid heat-transfer, requires a special separation device, which complicates the hardening process flow diagram. This leads to an increase in capital and operating costs.

0 The purpose of the invention is to simplify the process.

The goal is achieved according to the method of quenching the products of thermal cracking of hydrocarbon

5 of raw materials carried out in the presence of solid heat transfer medium, including their supply together with the carried coolant to the upper part of the quenching device, axial flow of cooling liquid, heat stable liquid supply, along the walls of the quenching device. And withdrawal of thermal cracking products and heat stable liquid, including , what

5, thermal cracking products with entrained coolant are introduced into the upper part of the quenching device tangentially and removed from its middle part.

0 It is advisable to use a hydrocarbon feedstock with a boil point as a thermostable liquid. 350-.

The drawing shows a diagram of the method for quenching the products of thermal decomposition of hydrocarbons;

In the quenching device 1 through the pipe 2 from the reactor (in the diagram., not shown) the gas-vapor mixture (CBC) of products is tangentially injected. thermal decomposition of hydrocarbon raw materials together with entrained solid coolant at 500-; 1000 C. To the formed vortex flow through the pipe 3, located along the axis of the apparatus, coolant, such as water, is supplied, during evaporation of which is the CBC temperature

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reduced to a level sufficient to terminate thermal decomposition reactions (400-600 s). The solid particles of the coolant under the action of centrifugal SILs are thrown onto the walls of the quenching device 1 and washed with a film of a thermostable liquid, which is fed through the pipe 4 and the annular crack 5. Any liquid hydrocarbons with a density lower than the density of particles are used as a thermostable liquid, and so on. 350-500 ° C so that there is no significant evaporation at the final quenching temperature (400-600 ° C). The thermally stable liquid together with the captured solid coolant is discharged through the side 6 sleeve and fed to the second heat treatment or through the external cooler 7 return through the pipe 4.

Mixed and cooled CGS together with coolant vapors (water vapor) are discharged through pipe 8 and then through the condensation system 9 for further processing.

An example. During the pyrolysis of 100 kg / h of high-sulfur fuel oil at 900 ° C, 124.5 kg / h of OPG are obtained, which is fed tangentially into the quenching device. The CBC in the quenching device is cooled with water in the amount of 81.2 kg / h, fed axially. To protect the walls of the quenching device from coking, they are constantly moistened with a fuel oil film (boiling point 350 s), which, when moving down, captures solid particles contained in the CG in the amount of 1.5 kg / h. In the quenching process in 0.05 s, the temperature of the OPO decreases from 900 to 550 ° C. After cooling, the ASG has the following hydrocarbon composition, wt.%: H. 2.14, CH4 19.35; CjHg 0.86, C2H4 22.78, 2.47; 0.96; 0.86; 2.37, benzene-toluene fraction 15.96, fraction with m.p. above 230 ° C 32.25 A high total content of unsaturated hydrocarbons (CjH, CjHg, .C4Hg,) 27.07 wt.% indicates a high quality of quenching.

vniipi

Order 1551/33

Branch PPP Patent, Uzhgorod, st. Project, 4

21227

Implementation of tangential supply of products of thermal decomposition of hydrocarbon raw materials together with entrained solid coolant

5 provides a vortex structure of a gas-dust flow in the apparatus, under the influence of which solid particles are separated on the wall and washed away by a flowing heat-stable liquid.

10 The aerodynamic structure of the vortex flow with the predominant influence of centrifugal forces allows maintaining a stable film movement of a thermostable liquid along the walls.

5 apparatus. Thus, in the core of the vortex flow there are thermal decomposition products of hydrocarbon raw materials that are not mixed with a thermostable liquid and are derived from the middle part of the quenching device. Such an arrangement of nozzles allows for the separation of vapor-gas products of thermal

25 decomposition of hydrocarbon and thermostable liquid with entrained solid coolant.

The quality of quenching cq, r-lacno as the proposed method has not been found in comparison with the known, although tangential input of thermal decomposition products significantly improves the hydrodynamic structure of the flow in the quenching device, stabilizing it, due to the ordered circular flow and penetration of the diffused cooling fluid. In the prototype, a pulsating hydrodynamic regime is unavoidable due to the collisions of cross-jets of vapor-gas products and a cooling fluid.

The proposed method of quenching allows us to simplify the technological scheme of quenching as a result of combining the quenching and separation of the vapor-gas products and the Silica thermostat with a blown solid heat carrier. The separation process of these streams is carried out one 35

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temporarily with the quenching process under the action of centrifugal forces, as a result of which the capital costs are halved and the operating costs of the quenching process are reduced by 30%.

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Claims (1)

1. METHOD FOR HAZARDING THERMAL CRACKING PRODUCTS Hydrocarbon is introduced into the upper part of the quenching device tangentially and remove them from its middle part. 1221227 2. The way to p. 1, about aphids; stable fluid use carbon— that as thermohydrogen raw materials with so kip. 350-500 ° C.