Flue gas incinerator and roller kiln flue gas treatment system

Abstract

The utility model discloses a flue gas incinerator and a roller kiln flue gas treatment system, which belong to the technical field of in-kiln flue gas treatment and comprise a gas inlet pipeline, a first combustion chamber and an exhaust pipeline, the gas inlet pipeline is communicated with one end of the first combustion chamber, and the exhaust pipeline is communicated with the other end of the first combustion chamber. The first combustion chamber is provided with at least one flue gas catalysis device, the flue gas catalysis device is arranged in the first combustion chamber, the heating device is arranged in the gas inlet pipeline, and the flue gas catalysis device comprises a grid and a catalyst carrier which are arranged perpendicular to the flue gas flowing direction; the catalyst carrier is arranged on the inner wall of the grid, the catalyst is detachably arranged on the inner wall of the grid, the catalyst on the catalyst carrier makes contact with flue gas, the flue gas is converted into harmless gas, the catalyst can be replaced after loss or inactivation, the flue gas conversion efficiency is guaranteed, open fire conversion is avoided, and the use safety of equipment is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fume treatment in kilns, in particular to a fume incinerator and a roller kiln fume treatment system. Background Art

[0002] With the development of new energy technologies, high-energy-density lithium batteries have been widely used. The existing manufacturing process of lithium battery electrode materials is that the raw materials are sintered at high temperatures in a kiln. During the sintering process of the electrode materials, a chemical reaction occurs, and harmful gases will be volatilized in the temperature-raising zone of the kiln and mixed into the flue gas. The temperature of this part of the flue gas is relatively high, and most of the harmful substances in it can be converted and removed through combustion oxidation reactions. Most existing sintering processes involve adding an incinerator in the temperature-raising section of the kiln, that is, before the exhaust fan. The incinerator is equipped with a gas burner, which reheats the harmful gases through open flame combustion of gas and combustion-supporting air, thereby converting the harmful substances into harmless gases before discharging them. The above-mentioned open flame combustion has its limitations. Adding fuel gas to heat the flue gas increases energy consumption; the combustion-supporting gas requires a separate pipeline and combustion-supporting fan, which increases construction costs; the addition of combustion gas, combustion-supporting gas and heated harmful gases increases the total volume flow in the pipeline, requiring an increase in the thickness of the high-temperature refractory insulation layer, resulting in a large incinerator, further increasing construction costs; the combustion of gas itself also produces harmful substances, especially nitrogen, which may be converted into NOx at high temperatures; high combustion condition control requirements are required, and excessively high flue gas temperatures at the end will damage the fan and pipeline; in addition, the use of open flame combustion has the potential risk of deflagration, which poses a threat to personal safety, and therefore a non-open flame flue gas treatment device is needed to convert and treat the flue gas in the kiln.

[0003] The existing patent application with publication number CN116045274A discloses a flameless combustion device for coal-ammonia co-combustion, comprising: a pulverized coal pre-combustion unit, an ammonia decomposition unit, and a coal-ammonia co-combustion unit. The ammonia in the ammonia pre-combustion chamber exchanges heat with the high-temperature flue gas in the high-temperature flue gas duct, and under the action of the ammonia decomposition catalyst, becomes ammonia pre-combustion gas (NH3, N2 and H2) and enters the combustion chamber. In the coal-ammonia co-combustion unit, the ammonia pre-combustion gas is first mixed with the secondary air when entering the combustion chamber; the incompletely burned high-temperature flue gas enters the combustion chamber and is preliminarily mixed with the ammonia pre-combustion gas under the action of the blunt body; the CO, H2 and residual coal coke in the incompletely burned flue gas and the H2 in the ammonia pre-combustion gas are strongly mixed with the secondary air. The internal catalyst of this flameless combustion device has low internalization efficiency for the flue gas and is not easy to replace after being worn out. Utility Model Content

[0004] One of the purposes of the utility model is to provide a flue gas incinerator, which solves the problem that the catalyst flue gas treatment efficiency in the existing sintering electrode material flue gas treatment equipment is low and difficult to replace after being worn out.

[0005] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0006] A flue gas incinerator comprises an air intake duct, a first combustion chamber and an exhaust duct, wherein the air intake duct is connected to one end of the combustion chamber, and the exhaust duct is connected to the other end of the first combustion chamber. The first combustion chamber is provided with at least one flue gas catalytic device, which is arranged in the first combustion chamber, and the heating device is arranged in the air intake duct. The flue gas catalytic device comprises a grid and a catalyst carrier arranged perpendicular to the flow direction of the flue gas, and the catalyst carrier is detachably arranged on the inner wall of the grid. The catalyst carrier contacts the flue gas and converts the flue gas into harmless gas. The catalyst carrier can be replaced after loss or deactivation to ensure the efficiency of flue gas conversion, without open flame conversion, and improve the safety of equipment use.

[0007] Furthermore, the combustion chamber includes a plurality of the flue gas catalytic devices, which are arranged at intervals along the flow direction of the flue gas to improve the efficiency of the catalytic reaction.

[0008] Furthermore, the flue gas catalytic device is detachably arranged in the combustion chamber, so as to facilitate the replacement of the catalyst.

[0009] More preferably, the heating device is an electric heating element, which is safe for heating without open flame and has high accuracy in controlling temperature.

[0010] Preferably, the catalyst carrier is arranged in a honeycomb shape, and a plurality of the catalysts form an array to increase the contact area between the catalyst and the flue gas.

[0011] Preferably, it further includes an air distribution pipe and an air valve, wherein the air distribution pipe is arranged in the air inlet pipe and the air distribution pipe is arranged behind the heating device, and the air valve is arranged on the air distribution pipe. The opening of the air valve is adjustable and is used to inhale air and mix it into the flue gas, adjust the oxygen content of the mixed gas, and ensure smooth reaction.

[0012] More preferably, the combustion chamber further includes a temperature sensor, a first oxygen sensor and a second oxygen sensor. The temperature sensor and the first oxygen sensor are arranged in the combustion chamber near one end of the combustion chamber, and the second oxygen sensor is arranged in the combustion chamber near the other end of the combustion chamber, for accurately controlling the temperature and oxygen concentration of the flue gas undergoing the reaction, ensuring that the reaction proceeds continuously and stably, and preventing explosion due to excessive oxygen concentration.

[0013] As a more preferred embodiment, an exhaust fan is further included, which is connected to the exhaust duct and is used to increase the power of smoke flow so that the smoke can be discharged smoothly.

[0014] The second purpose of the utility model is to provide a roller kiln flue gas treatment system, which solves the problem that existing flue gas treatment equipment cannot be repaired and the catalyst replaced without stopping the machine.

[0015] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0016] A flue gas treatment system includes a first valve, a second valve and a third valve. The first valve is arranged between the air intake pipe and the exhaust pipe, the first valve is connected in parallel with the first combustion chamber, the second valve is arranged at one end of the combustion chamber, and the third valve is arranged at the other end of the combustion chamber. A branch bypass method is used to facilitate maintenance of the combustion chamber.

[0017] The third purpose of the utility model is to provide a roller kiln flue gas treatment system, which solves the problem that existing flue gas treatment equipment cannot be repaired and the catalyst replaced without stopping the machine.

[0018] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is as follows:

[0019] A flue gas treatment system includes a second combustion chamber, a second valve, a third valve, a fourth valve and a fifth valve. The first combustion chamber and the second combustion chamber are connected in parallel between the air intake pipe and the exhaust pipe. The second valve is arranged at one end of the first combustion chamber, the third valve is arranged at the other end of the first combustion chamber, the fourth valve is arranged at one end of the second combustion chamber, and the fifth valve is arranged at the other end of the second combustion chamber. This can increase the flue gas flow rate that can be processed simultaneously, and the combustion chamber can also be used separately, and maintenance can be carried out without stopping the kiln.

[0020] Flue gas is converted through a reaction without open flame combustion, which is highly safe and reduces energy consumption.

[0021] The beneficial effects of the utility model are:

[0022] (1) The flue gas incinerator is provided with a flue gas catalytic device in the combustion chamber, and a grille is provided on the flue gas catalytic device, and a catalyst carrier is provided in the grille, and a catalyst is provided on the catalyst carrier. After catalysis, the flue gas is smokelessly burned and converted into harmless gas for discharge outward. The catalyst carrier is detachably inserted into the grille and can be quickly replaced after the catalyst fails. The grille is used for flue gas circulation, which increases the contact area between the flue gas and the catalyst and improves the efficiency of flue gas treatment. Moreover, the flue gas conversion is carried out in a smokeless combustion manner, and the reaction temperature is lower than the open flame combustion temperature, eliminating the potential risk of explosive combustion caused by open flame combustion.

[0023] (2) The air inlet duct of the flue gas incinerator is equipped with a heating device and an air distribution duct. The heating device heats the flue gas by electric heating. The air distribution duct is provided with an adjustable valve. The flue gas is heated electrically to reach the conversion temperature. The air is mixed into the flue gas through the air distribution duct to control the oxygen content of the mixed gas, ensuring that the flue gas is converted in a smokeless combustion manner, reducing energy water pumps and lowering construction costs.

[0024] (3) The flue gas incinerator is provided with two parallel flue gas branches between the air inlet pipe and the exhaust pipe. Combustion chambers are set up on the two branches respectively, and valves are installed at both ends of the combustion chambers to expand the flue gas treatment flow. At the same time, the kiln can be repaired without stopping by switching the combustion chambers separately. Combined with the detachable catalyst, it ensures that the production line can operate uninterruptedly around the clock. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A structural diagram of the flue gas incinerator provided by the utility model;

[0026] Figure 2 A cross-sectional view of the flue gas catalytic device of the flue gas incinerator provided by the utility model;

[0027] Figure 3 The system composition of the roller kiln flue gas incinerator provided in the second embodiment of the present utility model;

[0028] Figure 4 This is the system composition of the roller kiln flue gas incinerator provided in Example 3 of the present utility model.

[0029] Reference numerals:

[0030] 1. Intake duct; 2. First combustion chamber; 21. Temperature sensor; 22. First oxygen sensor; 23. Second oxygen sensor; 24. Second combustion chamber; 3. Flue gas catalytic device; 31. Grille; 32. Catalyst; 4. Heating device; 5. Air valve; 6. Air distribution duct; 7. Exhaust duct; 8. First valve; 81. Second valve; 82. Third valve; 83. Fourth valve; 84. Fifth valve; 9. Exhaust fan. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Example 1

[0033] like Figure 1-Figure 2 As shown, this embodiment discloses a flue gas incinerator, including an air intake pipe 1, a first combustion chamber 2, an exhaust pipe 7 and a heating device 4, the air intake pipe 1 is connected to one end of the first combustion chamber 2, and the exhaust pipe 7 is connected to the other end of the first combustion chamber 2, the first combustion chamber 2 is provided with at least one flue gas catalytic device 3, the flue gas catalytic device 3 is arranged in the first combustion chamber 2, the flue gas catalytic device 3 includes a grille 31 and a catalyst carrier 32 arranged perpendicular to the direction of flue gas flow, the catalyst carrier 32 is arranged in the grille 31, and a flue gas channel is formed in the grille 31, the catalyst carrier 32 is detachably mounted on the inner wall of the grille 31, and is located on the side wall of the flue gas channel, thereby increasing the contact area between the flue gas and the catalyst carrier 32 and improving the catalytic efficiency of the flue gas, the catalyst carrier 32 can be replaced one by one after the catalyst carrier 32 is lost or deactivated, the catalyst carrier 32 is arranged along the direction of flue gas flow, thereby increasing the contact area between the flue gas and the catalyst carrier 32, thereby improving the catalytic reaction efficiency.

[0034] Among them, a catalyst is provided on the catalyst carrier 32, which can promote the reaction of CO with oxygen and the reaction of nitride with oxidation, and convert CO and NO in the exhaust gas into harmless substances by reducing the activation energy of the reaction and increasing the reaction rate. The catalyst uses metal oxides or composite oxides as active components; in addition, the detachable catalyst carriers 32 are arranged tightly, and the catalyst carriers 32 can be inserted into the grid 31. A high-density flexible thermal insulation material is arranged on the inner wall of the first combustion chamber 2, and is compressed into a sealed structure.

[0035] Furthermore, the flue gas catalytic device 3 is detachably arranged in the first combustion chamber 2. The flue gas catalytic device 3 is inserted into the first combustion chamber 2 from the top of the first combustion chamber 2, which facilitates the replacement and maintenance of the catalyst carrier 32 on the flue gas catalytic device 3.

[0036] Preferably, a plurality of flue gas catalytic devices 3 are arranged at intervals along the flow direction of the flue gas to improve the conversion efficiency of the flue gas.

[0037] Preferably, the catalyst carrier 32 is configured in a honeycomb shape to further increase the contact area between the flue gas and the catalyst, thereby improving the catalytic reaction efficiency.

[0038] More preferably, the catalyst carriers 32 are arranged in a blade-like front-to-back array, allowing the flue gas to pass through each one, gradually undergoing a catalytic reaction as it passes through. After a period of use, the performance of some catalyst carriers 32 within the grilles 31 may decline. These carriers can be repositioned to extend their service life, or replaced one by one to reduce operating costs.

[0039] Preferably, the diameter of the first combustion chamber 2 is 2-10 times the diameter of the intake pipe 1 or the exhaust pipe 7. The first combustion chamber 2 can be installed on the flue gas pipe as a part of the pipe, which reduces the manufacturing cost and installation difficulty and can be used in the modification of the existing flue gas pipe.

[0040] Furthermore, it also includes a heating device 4, which is arranged in the air intake pipe 1 and is located at the front end of the flue gas entering the air intake pipe 1. It plays the role of heating the flue gas to the reaction temperature. By controlling the temperature of the flue gas, it is ensured that the temperature of the flue gas is in the optimal reaction range when passing through the flue gas catalytic device 3, thereby ensuring the conversion efficiency of the flue gas. For example, if the flue gas temperature is lower than 200°C, the flue gas is heated.

[0041] Among them, the heating device 4 is an electric heating element, and the heating element has the characteristics of no open flame, accurate temperature control and fast heating. More specifically, the heating device 4 is one of an electric heating wire or an electric heating rod.

[0042] Furthermore, it also includes an air distribution duct 6, which is arranged in the air intake duct 1 and behind the heating device 4. The air distribution duct 6 is in a negative pressure state. After opening, it can directly introduce external air into the air intake duct 1 to mix with the flue gas, thereby providing oxygen for the reaction. When the oxygen concentration of the flue gas is sufficient for the reaction, the air distribution duct 6 can be completely closed.

[0043] Furthermore, it also includes an air valve 5, which is arranged on the air distribution pipe 6. The opening of the air valve 5 is adjustable, and the air valve 5 adopts.

[0044] Preferably, the first combustion chamber 2 further comprises a temperature sensor 21, a first oxygen sensor 22 and a second oxygen sensor 23. The temperature sensor 21 and the first oxygen sensor 22 are arranged in the first combustion chamber 2 near one end of the first combustion chamber 2, and the second oxygen sensor 23 is arranged in the first combustion chamber 2 near the other end of the first combustion chamber 2, for respectively detecting the reaction temperature of the flue gas and the oxygen concentration before and after the reaction. The amount of combustion-supporting air is adjusted by the opening of the air valve 5 so that after the low-oxygen or oxygen-free flue gas is mixed with the combustion-supporting air, the oxygen in the mixed gas is controlled to be maintained at a high concentration without generating open flame combustion. When the device 21 detects that the temperature of the mixed gas is lower than the complete combustion temperature, generally below 350°C, the electric heating device 4 increases the heating power to increase the flue gas temperature. When the tempered mixed flue gas passes through multiple groups of catalyst carriers 32, the oxygen in the gas undergoes a low-temperature redox reaction with harmful organic matter to generate carbon dioxide, water and nitrogen. The oxygen concentration in the flue gas after the reaction is detected by the second oxygen sensor 23. If the oxygen concentration is close to the lower limit (the oxygen concentration is too low and there is a risk of explosion), the opening of the air valve 5 must be increased to increase the amount of combustion-supporting air to ensure that there is enough oxygen involved in the low-temperature combustion, so that the flue gas can be converted without open flames.

[0045] More preferably, an exhaust fan 9 is further included, which is connected to the exhaust duct 7. The exhaust fan 9 is used to actively discharge the converted flue gas to the outside, thereby controlling the terminal flue gas flow rate.

[0046] The working process of the flue gas incinerator is as follows:

[0047] S1. Preheating flue gas: One end of the first combustion chamber 2 is connected to the air intake pipe 1, and the other end is connected to the exhaust pipe 7. The flue gas passes through the air intake pipe 1 and is heated to a set temperature by the heating device 4 in the air intake pipe 1;

[0048] S2. Air distribution: The heated flue gas flows in the air intake duct 1. The air distribution duct 6 in the air intake duct 1 is opened to inject air into the air intake duct 1. The flue gas and air are mixed and then enter the first combustion chamber 2.

[0049] S3, catalysis: the flue gas catalytic device 3 in the first combustion chamber 2 catalytically converts the mixed gas;

[0050] S4. Continuous conversion: The first combustion chamber 2 detects the oxygen content and temperature of the incoming mixed gas, as well as the oxygen content of the mixed gas after conversion, and controls the opening of the air distribution pipe 6 to keep the oxygen content of the mixed gas before conversion within a certain range. The flue gas is treated in a non-open flame manner, the temperature of the flue gas conversion becomes lower, and under most working conditions, the flue gas does not need to be heated for conversion; the oxygen utilization rate is greatly improved, a small amount of air is distributed in the oxygen-free and low-oxygen atmosphere to support combustion, and no air distribution is required in the aerobic environment; the pollutant removal efficiency is high and there is no secondary pollution caused by fuel combustion.

[0051] Example 2

[0052] See also Figure 3 This embodiment also discloses a roller flue gas treatment system, which also includes a first valve 8, a second valve 81 and a third valve 82. The first valve 8 is arranged between the air intake duct 1 and the exhaust duct 7. The first valve 8 is connected in parallel with the first combustion chamber 2. The second valve 81 is arranged at one end of the first combustion chamber 2, and the third valve 82 is arranged at the other end of the first combustion chamber 2. Considering the economic efficiency of use, the first combustion chamber 2 operates in the form of a bypass pipeline. Under normal operation, the bypass valve 16 is normally closed. When maintenance is required, the third valve 82 is opened to bypass the flue gas, and the first valve 8 and the second valve 81 before and after the first combustion chamber 2 are closed. Online maintenance is implemented, so that the kiln production line can be kept running without stopping, thereby improving the use efficiency of the kiln.

[0053] Example 3

[0054] See also Figure 4This embodiment also discloses a roller flue gas treatment system, which also includes a second combustion chamber 24, a second valve 81, a third valve 82, a fourth valve 83 and a fifth valve 84. The first combustion chamber 2 and the second combustion chamber 24 have the same structure. The first combustion chamber 2 and the second combustion chamber 24 are connected in parallel between the intake pipe 1 and the exhaust pipe 7. The second valve 81 is arranged at one end of the first combustion chamber 2 and the third valve 82 is arranged at the other end of the first combustion chamber 2. The fourth valve 83 is arranged at one end of the second combustion chamber 24, and the fifth valve 84 is arranged at the other end of the second combustion chamber 24.

[0055] By arranging the first combustion chamber 2 and the second combustion chamber 24 in parallel, and coordinating the opening and closing of the second valve 81, the third valve 82, the fourth valve 83 and the fifth valve 84, the first combustion chamber 2 and the second combustion chamber 24 can work simultaneously to increase the processing flow of the flue gas, or they can work separately, playing the role of redundant arrangement and reducing failures, thereby ensuring the stable operation of the kiln. When one of them fails, it can be closed separately or the catalyst carrier 32 can be replaced.

[0056] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. A flue gas incinerator, comprising an air intake duct (1), a first combustion chamber (2), an exhaust duct (7) and a heating device (4), wherein the air intake duct (1) is connected to one end of the first combustion chamber (2), the exhaust duct (7) is connected to the other end of the first combustion chamber (2), and the heating device (4) is arranged in the air intake duct (1), characterized in that: At least one flue gas catalytic device (3) is provided in the first combustion chamber (2). The flue gas catalytic device (3) is arranged in the first combustion chamber (2). The flue gas catalytic device (3) comprises a grille (31) arranged perpendicular to the flue gas flow direction and a catalyst carrier (32). The catalyst carrier (32) is detachably arranged on the inner wall of the grille (31).

2. The flue gas incinerator according to claim 1, characterized in that: The first combustion chamber (2) comprises a plurality of flue gas catalytic devices (3), and the plurality of flue gas catalytic devices (3) are arranged at intervals along the flow direction of the flue gas.

3. The flue gas incinerator according to claim 1 or 2, characterized in that: The flue gas catalytic device (3) is detachably arranged in the first combustion chamber (2).

4. The flue gas incinerator according to claim 3, characterized in that: The heating device (4) is an electric heating element.

5. The flue gas incinerator according to claim 3, characterized in that: The catalyst carrier (32) is arranged in a honeycomb shape, and a plurality of the catalyst carriers (32) form an array.

6. The flue gas incinerator according to claim 3, characterized in that: The invention also includes an air distribution pipe (6) and an air valve (5), wherein the air distribution pipe (6) is arranged in the air inlet pipe (1), and the air distribution pipe (6) is arranged behind the heating device (4), and the air valve (5) is arranged on the air distribution pipe (6), and the opening of the air valve (5) is adjustable.

7. The flue gas incinerator according to claim 1, characterized in that: The first combustion chamber (2) further comprises a temperature sensor (21), a first oxygen sensor (22) and a second oxygen sensor (23); the temperature sensor (21) and the first oxygen sensor (22) are arranged in the first combustion chamber (2) at one end close to the first combustion chamber (2); and the second oxygen sensor (23) is arranged in the first combustion chamber (2) at the other end close to the first combustion chamber (2).

8. The flue gas incinerator according to claim 7, characterized in that: It also includes an exhaust fan (9), which is connected to the exhaust duct (7).

9. A roller kiln flue gas treatment system, comprising the flue gas incinerator according to any one of claims 1 to 8, characterized in that: The invention also includes a first valve (8), a second valve (81) and a third valve (82), wherein the first valve (8) is arranged between the intake pipe (1) and the exhaust pipe (7), the first valve (8) is connected in parallel with the first combustion chamber (2), the second valve (81) is arranged at one end of the first combustion chamber (2), and the third valve (82) is arranged at the other end of the first combustion chamber (2).

10. A roller kiln flue gas treatment system, comprising the flue gas incinerator according to any one of claims 1 to 8, characterized in that: The invention also includes a second combustion chamber (24), a second valve (81), a third valve (82), a fourth valve (83) and a fifth valve (84); the first combustion chamber (2) and the second combustion chamber (24) are connected in parallel between the intake pipe (1) and the exhaust pipe (7); the second valve (81) is arranged at one end of the first combustion chamber (2); the third valve (82) is arranged at the other end of the first combustion chamber (2); the fourth valve (83) is arranged at one end of the second combustion chamber (24); and the fifth valve (84) is arranged at the other end of the second combustion chamber (24).

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