Carbon black reaction furnace capable of injecting fuel oil in radial direction

Abstract

The utility model relates to a carbon black reaction furnace device, in particular to a carbon black reaction furnace capable of spraying fuel oil in the radial direction. The carbon black reaction furnace comprises a combustion chamber, a throat section and a reaction section, the throat section comprises a first horn section and a second horn section, an axial fuel oil pipe for axial injection and a radial fuel oil pipe for radial injection are arranged at an inlet of the combustion chamber, and the axial fuel oil pipe is communicated with a fuel oil atomization air pipe. An axial fuel oil pipe is arranged in the reaction section, an axial cooling air pipe surrounds and wraps the outer side of the axial fuel oil pipe, a radial cooling air pipe surrounds and wraps the outer side of the radial fuel oil pipe, raw oil pipes for radial injection are arranged at the joint of the first horn section and the second horn section, the raw oil pipes are uniformly arranged in a surrounding manner, and the second horn section and the reaction section are in stepped expansion connection. The carbon black reaction furnace can improve the combustion efficiency of the combustion chamber, increase the temperature of the combustion chamber, reduce heat loss, save cost, increase the flow rate of high-temperature airflow and improve the reaction efficiency and the carbon black quality.

Description

Technical Field

[0001] The utility model relates to a carbon black reaction furnace device, in particular to a carbon black reaction furnace into which fuel oil is radially injected. Background Art

[0002] During carbon black production, the heat required for the carbon black reaction is provided by the combustion of fuel oil. The fuel oil is usually axially injected into the combustion chamber and burned to provide the necessary heat for the carbon black raw oil reaction.

[0003] At present, axial injection of fuel oil cannot be atomized well by pump pressure and needs to be atomized with the help of compressed air. Due to the low temperature of atomizing air, it is not ideal for the atomization and combustion of fuel oil, and it will also absorb temperature when entering the furnace, causing heat loss. In order to stabilize the furnace temperature, fuel oil needs to be added, otherwise the raw oil injected at the rear will be burned as fuel, which will increase consumption and reduce production capacity. Summary of the invention

[0004] The utility model aims to provide a carbon black reaction furnace with radial injection of fuel oil, so as to improve the combustion efficiency of the combustion chamber, reduce heat loss, save costs and increase profits.

[0005] A carbon black reactor with radial fuel oil injection comprises a combustion chamber, a throat section and a reaction section, wherein the throat section comprises a first trumpet section and a second trumpet section, an axial fuel oil pipe for axial injection and a radial fuel oil pipe for radial injection are provided at the inlet of the combustion chamber, the axial fuel oil pipe is connected to a fuel oil atomization air duct, and an axial cooling air duct is provided around the outside of the axial fuel oil pipe, and a radial cooling air duct is provided around the outside of the radial fuel oil pipe, a raw material oil pipe for radial injection is provided at the connection between the first trumpet section and the second trumpet section, the number of the raw material oil pipes is 4 to 8, the raw material oil pipes are evenly arranged around, and the second trumpet section is connected to the reaction section in a stepped expansion manner.

[0006] Furthermore, the diameter ratio of the outlet end of the second horn section to the reaction section is 1:1.2~1:1.3; further, the diameter ratio of the outlet end of the second horn section to the reaction section is 1:1.25.

[0007] Furthermore, the combustion chamber includes a direct section and a bell section, the tube diameter ratio of the front end and the rear end of the bell section is 2:1, the tube diameter ratio of the front end and the rear end of the first bell section of the throat section is 1.5:1, and the tube diameter ratio of the front end and the rear end of the second bell section of the throat section is 1:1.35~1:1.5.

[0008] Furthermore, the number of radial fuel oil pipes is 2 to 6, and the radial fuel oil pipes and radial cooling air ducts are arranged along the tangent direction of the combustion chamber.

[0009] The carbon black reactor with radial injection of fuel oil of the utility model has the following advantages:

[0010] (1) Radial injection is added on the basis of the original axial injection of fuel oil. The radially injected fuel oil is injected from the air inlet at the front end of the combustion chamber by four oil guns. It is injected by pump pressure and completely atomized and burned under the wind force of the air distributor, which improves the combustion efficiency. (2) The radial fuel oil pipe and radial cooling air duct are arranged along the tangent direction of the combustion chamber cross section, so that the fuel oil and air can generate swirl after entering the combustion chamber, enhance the contact between the fuel oil and the air, make the fuel oil fully burn, increase the temperature of the combustion chamber, and at the same time enhance the flow rate of the high-temperature airflow, increase the shear force between the high-temperature airflow and the raw oil, which is beneficial to improve the quality of carbon black. (3) The second trumpet section of the throat section is connected to the reaction section in a stepped expansion manner, which can also enhance the flow rate of the high-temperature airflow, improve the reaction efficiency, and improve the quality of carbon black. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the carbon black reactor into which the fuel oil is radially injected in the embodiment.

[0012] Figure 2 Schematic diagram of the cross-sectional structure of the combustion chamber of the reaction furnace in the embodiment.

[0013] In the figure: 1-axial fuel oil pipe, 2-fuel oil atomizing air duct, 3-axial cooling air duct, 4-radial fuel oil pipe, 5-radial cooling air duct, 6-combustion chamber, 7-raw oil pipe, 8-throat section, 81-first trumpet section, 82-second trumpet section, 9-reaction section. DETAILED DESCRIPTION

[0014] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the utility model, but the utility model can also be implemented in other ways different from those described herein, and therefore, the utility model is not limited to the limitations of the specific embodiments disclosed below.

[0015] like Figure 1~Figure 2The carbon black reactor with radial fuel oil injection shown in the figure comprises a combustion chamber 6, a throat section 8 and a reaction section 9, wherein the throat section 8 comprises a first trumpet section 81 and a second trumpet section 82, and an axial fuel oil pipe 1 for axial injection and four radial fuel oil pipes 4 for radial injection are arranged at the inlet of the combustion chamber 6, the axial fuel oil pipe 1 is connected to the fuel oil atomizing air pipe 2, and an axial cooling air pipe 3 is arranged around the outside of the axial fuel oil pipe 1, and a radial cooling air pipe 5 is arranged around the outside of the radial fuel oil pipe 4; the radial fuel oil pipe 4 can also be connected to a fuel oil atomizing air duct (not shown in the figure), and the fuel oil is injected by pump pressure and is completely atomized under the wind force of the air distributor to enter the combustion chamber 6 for combustion; the connection between the first trumpet section 81 and the second trumpet section 82 is provided with a raw oil pipe 7 for radial injection, and the number of raw oil pipes 7 is 6, and the raw oil pipes 7 are evenly arranged around the throat, and the second trumpet section 82 is connected with the reaction section 9 in a step-by-step expansion manner, so that the diameter of the reaction section 9 is larger than the diameter of the end of the second trumpet section 82, which is used to enhance the flow rate of the high-temperature airflow. In this embodiment, it is designed as an expansion step; and the diameter ratio of the outlet end of the second trumpet section 82 to the reaction section 9 is set to 1:1.2~1:1.3; in this embodiment, the diameter ratio of the outlet end of the second trumpet section 82 to the reaction section 9 is set to 1:1.25.

[0016] Among them, the combustion chamber 6 includes a direct section and a bell section, the tube diameter ratio of the front end and the rear end of the bell section is 2:1, the tube diameter ratio of the front end and the rear end of the first bell section 81 of the throat section 8 is 1.5:1, and the tube diameter ratio of the front end and the rear end of the second bell section 82 of the throat section 8 is 1:1.35~1:1.5. In this embodiment, the tube diameter ratio of the front end and the rear end of the second bell section 82 is set to 1:1.35.

[0017] like Figure 2 As shown, in this embodiment, the radial fuel oil pipe 4 and the radial cooling air duct 5 are arranged along the tangent direction of the cross section of the combustion chamber 6, so that the fuel oil and air can generate swirl after entering the combustion chamber 6, thereby enhancing the contact between the fuel oil and the air, allowing the fuel oil to burn fully, and increasing the temperature of the combustion chamber 6. At the same time, it can enhance the flow rate of the high-temperature airflow, increase the shear force between the high-temperature airflow and the raw oil, and is beneficial to improving the quality of carbon black.

[0018] The carbon black reactor of the utility model adds radial injection on the basis of the original axial injection of fuel oil. The radially injected fuel oil is injected from the air inlet at the front end of the combustion chamber 6 by four oil guns, and is injected by pump pressure and completely atomized and burned under the wind force of the air distributor, thereby improving the combustion efficiency and thus improving the utilization rate of the raw material oil. Before the transformation, the raw material oil flow rate was 5000 kg, and after the transformation, the raw material oil flow rate was 5050 kg. It can be seen that under the same conditions, the amount of raw material oil used has increased, the production capacity has increased, and the consumption caused by heat loss has been reduced.

Claims

1. A carbon black reactor with radial injection of fuel oil, comprising a combustion chamber, a throat section and a reaction section, characterized in that: The throat section includes a first trumpet section and a second trumpet section. An axial fuel oil pipe for axial injection and a radial fuel oil pipe for radial injection are provided at the entrance of the combustion chamber. The axial fuel oil pipe is connected to the fuel oil atomization air duct, and an axial cooling air duct is arranged around the outside of the axial fuel oil pipe. A radial cooling air duct is arranged around the outside of the radial fuel oil pipe. A raw material oil pipe for radial injection is provided at the connection between the first trumpet section and the second trumpet section. The raw material oil pipes are evenly arranged around, and the second trumpet section is connected to the reaction section in a stepped expansion manner.

2. The carbon black reactor with radial injection of fuel oil according to claim 1, characterized in that: The diameter ratio of the outlet end of the second horn section to the reaction section is 1:1.2~1:1.

3.

3. The carbon black reactor with radial injection of fuel oil according to claim 2, characterized in that: The tube diameter ratio between the front end and the rear end of the first horn section is 1.5:1, and the tube diameter ratio between the front end and the rear end of the second horn section is 1:1.35~1:1.

5.

4. The carbon black reactor with radial injection of fuel oil according to claim 1, characterized in that: The radial fuel oil pipe and the radial cooling air pipe are arranged along the tangent direction of the combustion chamber.

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