Electric induction heating cracking furnace

Abstract

The utility model discloses an electric induction heating cracking furnace, which comprises a plurality of heating units, a gas inlet pipe and a gas outlet pipe, each heating unit comprises a heat insulation layer, a coil and a plurality of heating pipes arranged in a rectangular array, the uniformly arranged heating pipes in each heating unit form a pipe group, the heat insulation layer wraps the outer layer of the pipe group, the coil is distributed around the heat insulation layer, and the gas inlet pipe and the gas outlet pipe are communicated with each other. The heating pipe is filled with a catalyst layer, the upper end of the heating pipe is communicated with the air inlet pipe through an upper pigtail pipe, and the lower end of the heating pipe is communicated with the air outlet pipe through a lower pigtail pipe. By adopting an electric induction heating mode, the device is simple in structure, convenient to control, uniform in heating, favorable for prolonging the service life of equipment and improving the yield, and high in heat efficiency and pollution-free due to no flue gas emission.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial cracking furnaces, in particular to an electric induction heating cracking furnace. Background Art

[0002] The cracking furnace is the main equipment in the petrochemical industry. Its main function is to react saturated hydrocarbon cracking raw materials (ethane, propane, LPG, naphtha, diesel, hydrogenated tail oil, etc.) to generate cracking gas rich in low-carbon olefins (ethylene, propylene, butadiene, etc.). The cracking gas passes through a deep cold separation device to obtain ethylene, propylene, butadiene and various by-products. The production capacity and technology of the cracking furnace directly determine the production scale, output and product quality of the entire chemical plant. The cracking reaction is a strong endothermic reaction with high reaction temperature and short residence time. A large amount of heat must be supplied to the reaction materials in a short time. The system is at high temperature and short residence time, with the highest temperature above 800 degrees, which is conducive to the primary reaction of generating olefins. The commonly used heating method is to burn natural gas or industrial gas to heat the raw materials through radiation and convection heat exchange. The device requires a large combustion chamber and convection flue. The heating pipe is located in the center and thick refractory insulation materials need to be laid around it. The operation is complicated and the maintenance requirements are high. The heating pipe is not heated evenly. Utility Model Content

[0003] The purpose of the utility model is to provide an electric induction heating cracking furnace to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an electric induction heating cracking furnace, comprising a plurality of heating units and an air inlet pipe and an air outlet pipe, wherein the heating units comprise a heat insulation layer, a coil and a plurality of heating tubes arranged in a rectangular array, wherein the heating tubes evenly arranged in each of the heating units form a tube group, wherein the heat insulation layer is wrapped around the outer layer of the tube group, and the coil is distributed around the heat insulation layer, wherein the interior of the heating tube is filled with a catalyst layer, and the upper end of the heating tube is connected to the air inlet pipe via an upper pigtail tube, and the lower end of the heating tube is connected to the air outlet pipe via a lower pigtail tube.

[0005] Preferably, the diameters of the upper pigtail tube and the lower pigtail tube are smaller than the diameter of the heating tube.

[0006] Preferably, the heat insulation layer is made of ceramic fiber material.

[0007] Compared with the prior art, the utility model has the following beneficial effects: the utility model adopts electric induction heating, the device has a simple structure, convenient control, and uniform heating, which is beneficial to extending the life of the equipment and increasing production, and because there is no smoke emission, the thermal efficiency is high and there is no pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of the structure of the utility model;

[0009] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle.

[0010] In the figure: 1. Inlet pipe; 2. Outlet pipe; 3. Heating pipe; 4. Insulation layer; 5. Coil; 6. Catalyst layer; 7. Pigtail pipe; 8. Lower pigtail pipe. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0012] See also Figure 1-2 The utility model provides a technical solution: an electric induction heating cracking furnace, comprising a plurality of heating units and an air inlet pipe 1 and an air outlet pipe 2. The heating unit comprises an insulation layer 4, a coil 5 and a plurality of heating tubes 3 arranged in a rectangular array. The heating tubes 3 evenly arranged in each heating unit form a tube group. The insulation layer 4 is wrapped in the outer layer of the tube group. The insulation layer 4 is made of ceramic fiber material. The insulation layer 4 ensures that the coil 5 is protected from the influence of the internal high temperature. The coil 5 is distributed around the insulation layer 4. When the coil 5 is working, a high-frequency current is passed to generate an alternating magnetic field to inductively heat the internal heating tube 3. The interior of the heating tube 3 is filled with a catalyst layer 6. The upper end of the heating tube 3 is connected to the air inlet pipe 1 through an upper pigtail pipe 7, and the lower end of the heating tube 3 is connected to the air outlet pipe 2 through a lower pigtail pipe 8. The diameters of the upper pigtail pipe 7 and the lower pigtail pipe 8 are smaller than the diameter of the heating tube 3.

[0013] Working principle: Coil 5 is arranged around heating tube 3, with insulation layer 4 in the middle. One or more heating tubes 3 can be arranged in the heating coil. Raw gas enters heating tube 3 through inlet pipe 1, flows in the heating tube, is heated to a predetermined temperature by electric induction heating coil (some raw gas needs to be acted on by catalyst), decomposed into required product gas, and then enters outlet pipe 2, and is sent to the next treatment process. Coil 5 is connected to an external power supply and controller to control the heating temperature, and the insulation layer 4 in the middle keeps coil 5 from being affected by the heating temperature.

[0014] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric induction heating cracking furnace, comprising a plurality of heating units and an air inlet pipe (1) and an air outlet pipe (2), characterized in that: The heating unit comprises a heat insulating layer (4), a coil (5) and a plurality of heating tubes (3) arranged in a rectangular array. The heating tubes (3) evenly arranged in each heating unit form a tube group. The heat insulating layer (4) is wrapped around the outer layer of the tube group. The coil (5) is distributed around the heat insulating layer (4). The interior of the heating tube (3) is filled with a catalyst layer (6). The upper end of the heating tube (3) is connected to the air inlet pipe (1) via an upper pigtail pipe (7), and the lower end of the heating tube (3) is connected to the air outlet pipe (2) via a lower pigtail pipe (8).

2. An electric induction heating cracking furnace according to claim 1, characterized in that: The diameters of the upper pigtail tube (7) and the lower pigtail tube (8) are smaller than the diameter of the heating tube (3).

3. The electric induction heating cracking furnace according to claim 1, characterized in that: The heat insulation layer (4) is made of ceramic fiber material.

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