Low-nitrogen carbon black reaction furnace
By designing a coaxially arranged combustion chamber, throat section and reaction chamber structure in a carbon black reactor, the carbon black tail gas is mixed with the oxidant and completely burned, the problem of high nitrogen oxide content in the carbon black tail gas in the carbon black production process is solved, and the nitrogen oxide content in the carbon black tail gas and combustion flue gas is significantly reduced.
Patent Information
- Application Number
- CN202420734316.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-10
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-04-10
AI Technical Summary
In the existing carbon black production process, the carbon black tail gas contains a higher nitrogen oxide, which leads to an increase in the nitrogen oxide content in the combustion flue gas of the subsequent exhaust gas incinerators and boilers, and there are problems of environmental pollution and resource waste.
A low-nitrogen carbon black reactor is designed, using a coaxially arranged combustion chamber, throat section and reaction chamber structure, and some carbon black tail gas is mixed with oxidant and then entered the reaction chamber, thereby reducing the nitrogen oxide content in the carbon black tail gas by complete combustion.
Through this technical method, the nitrogen oxide content in the carbon black tail gas produced by the carbon black reactor is reduced by 35-55%, thereby reducing the nitrogen oxide in the combustion flue gas by 30-50% in the subsequent process.
Smart Images
Figure CN222781545U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of carbon black production equipment, in particular to a low-nitrogen carbon black reaction furnace. Background Art
[0002] In the process of carbon black production, fuel combustion occurs in three processes: one is the carbon black reaction process; the second is the carbon black tail gas incinerator in the drying process; and the third is the tail gas boiler. Conventional low-nitrogen burners are used in the last two of the above three processes: one is the tail gas incinerator in the carbon black drying process. When the tail gas enters the incinerator, a low-nitrogen burner is used to reduce the nitrogen oxide content of the flue gas in the incinerator. The function of this flue gas is to dry the wet carbon black after granulation; the second is the carbon black tail gas boiler combustion process. When the carbon black tail gas enters the boiler, a low-nitrogen burner is used to reduce the nitrogen oxide content of the flue gas in the boiler. The function of this flue gas is to make the boiler generate high-temperature and high-pressure steam for resource recycling. The fuel carbon black tail gas used in the above two processes is generated by the carbon black reaction process. The carbon black tail gas generated by the carbon black reaction process contains nitrogen oxides. The carbon black tail gas containing nitrogen oxides is used as fuel for the subsequent carbon black tail gas incinerator and tail gas boiler, which is bound to increase the nitrogen oxide content of the final combustion flue gas of the carbon black tail gas incinerator and tail gas boiler. Utility Model Content
[0003] In order to solve the problems of the prior art, the utility model provides a low-nitrogen carbon black reactor. The low-nitrogen carbon black reactor adopts a coaxially arranged combustion chamber, a throat section, and a reaction chamber structure. Part of the carbon black tail gas in the carbon black production process is mixed with an oxidant and then enters the front end face of the reaction chamber, and at the same time, part of the carbon black tail gas enters the throat section, thereby reducing the nitrogen oxide content in the carbon black tail gas generated by the carbon black reactor.
[0004] The utility model provides a low-nitrogen carbon black reactor, comprising a combustion chamber, a throat section, and a reaction chamber which are connected in sequence and coaxially distributed, wherein the front end face of the combustion chamber is provided with a fuel hydrocarbon inlet and an oxidant inlet; the front end face of the throat section is connected to the combustion chamber, and the rear end face is connected to the reaction chamber, and a carbon black tail gas inlet and a raw material hydrocarbon inlet are provided on the outer edge of the throat section; the front end face of the reaction chamber is provided with two inlets, one of which is connected to the rear end face of the throat section, and the other is an inlet for a mixture of carbon black tail gas and oxidant.
[0005] As a further improvement, the fuel hydrocarbon inlet of the combustion chamber is a hole arranged at the center of a circle, and the oxidant inlet is a plurality of tube wall holes equidistantly distributed on the circle around the fuel hydrocarbon inlet. The number of the oxidant inlets is 6-12.
[0006] As a further improvement, the carbon black tail gas inlet and the raw hydrocarbon inlet of the throat section are a plurality of pipe wall holes equidistantly distributed at different positions on the same circumference. The number of carbon black tail gas inlets of the throat section is 12-16, and the number of raw hydrocarbon inlets is 8-12.
[0007] As a further improvement, the inlet for the carbon black tail gas and the oxidant mixture at the front end of the reaction chamber is a plurality of tube wall holes equidistantly distributed on the same circumference. The number of the inlet for the carbon black tail gas and the oxidant mixture is 6-12.
[0008] As a further improvement, the mass flow rate of the oxidant entering the inlet of the front end face of the combustion chamber is 16.5-20 times that of the fuel hydrocarbon.
[0009] As a further improvement, the carbon black tail gas flow rate entering the throat section inlet is 2.5-3.5 times the mass flow rate of the fuel hydrocarbon.
[0010] As a further improvement, the carbon black tail gas and the oxidant entering the front end of the reaction chamber are mixed at a mass flow rate ratio of 2.5-3.5 / 1, and the total mass of the mixture is 3.5-5.5 times that of the fuel hydrocarbon.
[0011] The beneficial effect of the utility model is that after using the low-nitrogen carbon black reactor of the utility model, the nitrogen oxides in the carbon black tail gas produced by the carbon black reactor are reduced by 35-55%; after the nitrogen oxide content in the carbon black tail gas is reduced, when the tail gas incinerator and boiler in the subsequent process use the tail gas as fuel, the nitrogen oxides in the final combustion flue gas are also reduced by 30-50%. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0013] Figure 1 It is a front sectional view of the utility model.
[0014] Figure 2 for Figure 1 Cross-sectional view in the D direction.
[0015] Figure 3 for Figure 1 Middle AA section view.
[0016] Figure 4 for Figure 1 Middle BB section view.
[0017] Figure 5 for Figure 1 Middle CC section view.
[0018] In the figure, there is a combustion chamber 1, a throat section 2, a reaction chamber 3, a fuel hydrocarbon inlet 11, a carbon black tail gas inlet 22, a raw hydrocarbon inlet 33, a carbon black tail gas and oxidant mixture inlet 44, and an oxidant inlet 55. DETAILED DESCRIPTION
[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0020] The utility model provides a low nitrogen carbon black reactor, such as Figure 1-5 As shown, it includes a combustion chamber 1, a throat section 2, and a reaction chamber 3 which are connected in sequence and coaxially distributed, the front end face of the combustion chamber is provided with a fuel hydrocarbon inlet 11 and an oxidant inlet 55; the front end face of the throat section is connected to the combustion chamber, and the rear end face is connected to the reaction chamber, and a carbon black tail gas inlet 22 and a raw hydrocarbon inlet 33 are provided on the outer edge of the throat section; the front end face of the reaction chamber is provided with two inlets, one of which is connected to the rear end face of the throat section, and the other is an inlet 44 for a mixture of carbon black tail gas and oxidant.
[0021] As a further improvement, the fuel hydrocarbon inlet of the combustion chamber is a hole arranged at the center of a circle, and the oxidant inlet is a plurality of tube wall holes equidistantly distributed on the circle around the fuel hydrocarbon inlet. The number of the oxidant inlets is 6-12.
[0022] As a further improvement, the carbon black tail gas inlet and the raw hydrocarbon inlet of the throat section are a plurality of pipe wall holes equidistantly distributed at different positions on the same circumference. The number of carbon black tail gas inlets of the throat section is 12-16, and the number of raw hydrocarbon inlets is 8-12.
[0023] As a further improvement, the inlet for the carbon black tail gas and the oxidant mixture at the front end of the reaction chamber is a plurality of tube wall holes equidistantly distributed on the same circumference. The number of the inlet for the carbon black tail gas and the oxidant mixture is 6-12.
[0024] As a further improvement, the mass flow rate of the oxidant entering the inlet of the front end face of the combustion chamber is 16.5-20 times that of the fuel hydrocarbon.
[0025] As a further improvement, the carbon black tail gas flow rate entering the throat section inlet is 2.5-3.5 times the mass flow rate of the fuel hydrocarbon.
[0026] As a further improvement, the carbon black tail gas and the oxidant entering the front end of the reaction chamber are mixed at a mass flow rate ratio of 2.5-3.5 / 1, and the total mass of the mixture is 3.5-5.5 times that of the fuel hydrocarbon.
[0027] The workflow of this utility model is as follows:
[0028] 1. Fuel hydrocarbon enters the combustion chamber 1 from the fuel hydrocarbon inlet 11, and at the same time, the oxidant for combustion enters the combustion chamber 1 from the oxidant inlet 55 at a mass flow rate of 16.5-20 times that of the fuel hydrocarbon for complete combustion, and the smoke generated by the combustion enters the throat section 2.
[0029] 2. The carbon black tail gas enters the carbon black tail gas inlet 22 of the throat section 2 at a mass flow rate of 2.5-3.5 times that of the fuel hydrocarbon. At the same time, the raw hydrocarbon enters from the raw hydrocarbon inlet 33 of the throat section 2. The carbon black and carbon black tail gas produced in the throat section 2 flow into the reaction chamber 3.
[0030] 3. The carbon black exhaust gas and the oxidant are mixed in a ratio of 2.5-3.5 / 1, and the total mass of the mixture is 3.5-5.5 times that of the fuel hydrocarbon. The mixture then enters from the carbon black exhaust gas and oxidant mixture inlet 44 at the front end of the reaction chamber. The carbon black exhaust gas and oxidant mixture that enters and the carbon black and carbon black exhaust gas that flow out of the throat section 2 enter the reaction chamber 3 and react again to form a qualified carbon black intermediate product.
[0031] 4. After the reaction is completed in the reaction chamber 3, the qualified carbon black intermediate product and carbon black tail gas flow out of the reaction chamber and enter the conventional carbon black system at the rear.
[0032] The low-nitrogen oxide flue gas produced in the combustion chamber of the carbon black reactor is mixed with the raw hydrocarbon entering the throat of the carbon black reactor to produce carbon black intermediates and carbon black tail gas. As the nitrogen oxides in the flue gas in the combustion chamber are reduced, the nitrogen oxides in the carbon black tail gas are also reduced simultaneously; after the nitrogen oxide content in the carbon black tail gas is reduced, when the tail gas incinerator and boiler in the subsequent process use the tail gas as fuel, the nitrogen oxides in the final combustion flue gas will also be reduced by 30-50%.
[0033] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred implementation of the utility model. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field is within the technical scope disclosed by the utility model. For ordinary technicians in the technical field, changes or replacements that can be easily thought of should be included in the protection scope of the utility model without departing from the principle of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.
Claims
1. A low nitrogen carbon black reactor, characterized in that: It comprises a combustion chamber, a throat section and a reaction chamber which are connected in sequence and coaxially distributed. The front end face of the combustion chamber is provided with a fuel hydrocarbon inlet and an oxidant inlet. The front end face of the throat section is connected to the combustion chamber, and the rear end face is connected to the reaction chamber. The outer edge of the throat section is provided with a carbon black tail gas inlet and a raw material hydrocarbon inlet. The front end face of the reaction chamber is provided with two inlets, one of which is connected to the rear end face of the throat section, and the other is an inlet for a mixture of carbon black tail gas and oxidant.
2. The low nitrogen carbon black reactor according to claim 1, characterized in that: The fuel hydrocarbon inlet of the combustion chamber is a hole arranged at the center of a circle, and the oxidant inlet is a plurality of tube wall holes equidistantly distributed on the circle surrounding the fuel hydrocarbon inlet.
3. The low nitrogen carbon black reactor according to claim 2, characterized in that: The number of the oxidant inlets is 6-12.
4. The low nitrogen carbon black reactor according to claim 1, characterized in that: The carbon black tail gas inlet and the raw hydrocarbon inlet of the throat section are a plurality of pipe wall holes equidistantly distributed at different positions on the same circumference.
5. The low nitrogen carbon black reactor according to claim 4, characterized in that: The number of carbon black tail gas inlets in the throat section is 12-16, and the number of raw hydrocarbon inlets is 8-12.
6. The low nitrogen carbon black reactor according to claim 1, characterized in that: The inlet of the carbon black tail gas and oxidant mixture on the front end surface of the reaction chamber is a plurality of tube wall holes distributed at equal distances on the same circumference.
7. The low nitrogen carbon black reactor according to claim 6, characterized in that: The number of inlets for the carbon black tail gas and oxidant mixture is 6-12.