Environment-friendly flue gas treatment device

Abstract

The utility model relates to the technical field of flue gas treatment, in particular to an environment-friendly flue gas treatment device which comprises a reaction kettle, microwave generators in a linear array are mounted at the top of the inner wall of the reaction kettle, and the microwave generators are used for exciting oxynitride in flue gas. The reaction kettle is internally provided with a net-shaped Fe-Mn bimetallic catalyst in a linear array, the outer surface of the net-shaped Fe-Mn bimetallic catalyst is fixedly connected with the inner surface of the reaction kettle, and the net-shaped Fe-Mn bimetallic catalyst and the microwave generator are arranged in a staggered manner. Compared with the prior art, the Fe-Mn bimetallic catalyst has the advantages that the Fe-Mn bimetallic catalyst is added, so that reactants can have higher reaction activity at lower temperature, the problems of harsh reaction temperature and small temperature window of a traditional method are solved, the Fe-Mn bimetallic catalyst is relatively low in manufacturing cost, the investment cost of initial equipment is lower, and the later maintenance cost is also remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of flue gas treatment technology, specifically an environmentally friendly flue gas treatment device. Background Technology

[0002] The current mainstream flue gas denitrification methods are selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). The basic principle of SCR technology is that within a certain temperature range, the reducing agent ammonia (NH3) reacts with nitrogen oxides (mainly NO and NO2) in the flue gas under the action of a catalyst, converting the nitrogen oxides into nitrogen (N2) and water (H2O). SCR systems require catalysts to promote the reduction reaction of nitrogen oxides, and the catalysts used are expensive, increasing the initial investment cost of the equipment.

[0003] Furthermore, catalysts are susceptible to poisoning by substances in the flue gas and require regular replacement. Additionally, SCR reactions typically occur within a specific temperature range, generally 300℃-400℃. Excessively high or low flue gas temperatures will affect catalyst activity and denitrification efficiency. The basic principle of SNCR technology is that within a suitable temperature window, a reducing agent (such as ammonia or urea solution) reacts with nitrogen oxides in the flue gas, converting them into nitrogen and water. Compared to SCR, SNCR generally has lower denitrification efficiency, typically between 30% and 70%. This is because there is no catalyst to promote the reaction, resulting in a relatively slow reaction rate and limited reduction of nitrogen oxides. NCR reactions are also highly temperature-sensitive, only effectively occurring within a specific temperature range (generally 850℃-1100℃). Excessively high or low temperatures will significantly reduce denitrification efficiency.

[0004] In summary, existing technologies for flue gas denitrification suffer from problems such as stringent reaction temperatures, small temperature windows, and high maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide an environmentally friendly flue gas treatment device to solve the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] An environmentally friendly flue gas treatment device includes a reaction vessel. A microwave generator in a linear array is installed on the top of the inner wall of the reaction vessel. The microwave generator is used to excite nitrogen oxides in the flue gas. A linear array of Fe-Mn bimetallic catalyst is arranged inside the reaction vessel. The outer surface of the Fe-Mn bimetallic catalyst is fixedly connected to the inner surface of the reaction vessel, and the Fe-Mn bimetallic catalyst and the microwave generator are arranged alternately. The Fe-Mn bimetallic catalyst is used to react nitrogen oxides with oxidizing substances present in the flue gas to produce nitrates and nitrites.

[0008] The reactor is equipped with an inlet pipe and an outlet pipe at both ends. A booster fan is fixedly installed inside the outlet pipe to discharge the flue gas inside the reactor. An air distribution mesh plate is fixedly installed inside the reactor near the inlet pipe.

[0009] Preferably, the end of the reactor near the outlet pipe adopts a funnel-shaped design to improve the smoothness of flue gas passing through the reactor.

[0010] Preferably, a circulating air pump is fixedly installed on the top of the reactor, an air inlet channel is fixedly installed at the air inlet of the circulating air pump, the end of the air inlet channel away from the circulating air pump is fixedly connected to the air outlet pipe, and an air outlet channel is fixedly installed at the air outlet of the circulating air pump, one end of the air outlet channel extends into the interior of the reactor and is located between the air distribution mesh plate and the mesh Fe-Mn bimetallic catalyst.

[0011] Preferably, the exhaust pipe is equipped with an exhaust solenoid valve and a flue gas detection device, with the flue gas detection device and the solenoid valve located on opposite sides of the exhaust pipe.

[0012] Preferably, a drain pipe is installed on one side of the reactor, and a control valve is provided on the drain pipe.

[0013] Preferably, a filter screen is detachably connected inside the air intake pipe, and a limiting ring is fixedly installed inside the air intake pipe and on one side of the filter screen.

[0014] The beneficial effects of this utility model are:

[0015] This invention employs microwave catalytic excitation combined with Fe-Mn bimetallic catalyst catalysis, enabling reactants to exhibit higher reactivity at lower temperatures. This solves the problems of harsh reaction temperatures and small temperature windows inherent in traditional methods. The Fe-Mn bimetallic catalyst is relatively inexpensive, resulting in lower initial equipment investment costs and significantly reduced maintenance costs. In actual production, this invention primarily generates nitrates and nitrites while producing almost no ammonia, greatly reducing the risk of ammonia leakage and preventing secondary pollution. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0019] Figure 3 This is a structural schematic diagram of Embodiment 3 of this utility model;

[0020] Figure 4 This is a utility model Figure 3 Enlarged view of point A in the middle.

[0021] The attached figures are labeled as follows:

[0022] 1. Reactor; 2. Microwave generator; 3. Mesh Fe-Mn bimetallic catalyst; 4. Inlet pipe; 5. Outlet pipe; 6. Booster fan; 7. Air distribution plate; 8. Circulating air pump; 9. Inlet channel; 10. Outlet channel; 11. Solenoid valve; 12. Flue gas detection device; 13. Drain pipe; 131. Control valve; 14. Filter screen; 15. Restriction ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: As Figure 1 An environmentally friendly flue gas treatment device includes a reaction vessel 1. A microwave generator 2 arranged in a linear array is installed on the top of the inner wall of the reaction vessel 1. The microwave generator 2 is used to excite nitrogen oxides in the flue gas. A mesh Fe-Mn bimetallic catalyst 3 arranged in a linear array is disposed inside the reaction vessel 1. The mesh Fe-Mn bimetallic catalyst 3 is formed by attaching Fe-Mn bimetallic catalyst to a mesh structure. The outer surface of the mesh Fe-Mn bimetallic catalyst 3 is fixedly connected to the inner surface of the reaction vessel 1, and the mesh Fe-Mn bimetallic catalyst 3 and the microwave generator 2 are arranged alternately. The mesh Fe-Mn bimetallic catalyst 3 is used to react nitrogen oxides with oxidizing substances present in the flue gas to produce nitrates and nitrites.

[0025] The reactor 1 is provided with an inlet pipe 4 and an outlet pipe 5 at both ends. Both the inlet pipe 4 and the outlet pipe 5 are connected to the external pipeline, so that the flue gas can enter the reactor 1 through the inlet pipe 4 and enter the next flue gas treatment equipment through the outlet pipe 5. A booster fan 6 is fixedly installed inside the outlet pipe 5. The booster fan 6 is used to discharge the flue gas inside the reactor 1. A wind distribution plate 7 is fixedly installed inside the reactor 1 near the inlet pipe 4. The microwave generator 2 and the booster fan 6 are both existing technologies, with external power supply and corresponding external control switches, which will not be described in detail here.

[0026] Flue gas enters the reactor 1 through the inlet pipe 4. After passing through the air distribution plate 7, the flue gas is evenly distributed through the area where the mesh Fe-Mn bimetallic catalyst 3 is located. The microwave generator 2 generates microwaves of a suitable frequency to excite the nitrogen oxides in the flue gas. The excited nitrogen oxides have stronger reactivity. At the same time, under the action of the Fe-Mn bimetallic catalyst, the nitrogen oxides react with the oxidizing substances present in the flue gas to produce nitrates and nitrites. The gas after passing through the mesh Fe-Mn bimetallic catalyst 3 is the treated flue gas. Driven by the booster fan 6, it leaves the reactor 1 through the outlet pipe 5 for further processing and application.

[0027] The end of the reactor 1 near the outlet pipe 5 adopts a funnel-shaped design to improve the smoothness of flue gas passing through the reactor 1 and avoid obstruction of flue gas discharge.

[0028] Compared with traditional flue gas denitrification methods, this application offers significantly higher efficiency. Microwave energy enables molecules in the reaction system to gain energy rapidly, quickly transitioning from the ground state to the excited state, greatly increasing the reaction rate and drastically shortening the reaction time. When treating nitrogen oxides, the conversion rate can reach 98% in a short time, effectively improving treatment efficiency. Simultaneously, there is a synergistic effect between microwaves and metal catalysts. The microwave field can alter the electron cloud distribution of the metal catalyst, making its active sites more active and significantly enhancing the catalyst's adsorption and activation capacity for nitrogen oxides.

[0029] Secondly, this application exhibits strong selectivity for reactants. By rationally selecting the microwave frequency and the type and structure of the metal catalyst, selective oxidation of specific nitrogen oxides can be achieved. For example, for nitrogen oxides in different forms, such as nitric oxide (NO) and nitrogen dioxide (NO2), targeted oxidation and transformation can be carried out according to actual needs, converting them into substances that are easier to handle or harmless, such as nitrogen (N2) and water (H2O). At the same time, due to the precise action of the microwave and the specificity of the metal catalyst, this invention can effectively suppress some unnecessary side reactions.

[0030] Compared to traditional oxidation methods, this technology reduces the formation of other byproducts, making the reaction more inclined towards the formation of the target product, thereby improving the selectivity and purity of nitrogen oxide conversion. This invention also aligns with the concept of green development. Microwave heating is a "volume heating" method, unlike traditional external heating methods. It can directly act on the molecules within the reaction system, allowing the molecules to generate heat through their own polarization and relaxation processes in the microwave field. This achieves rapid and uniform heating, reducing heat loss during transfer, utilizing energy more effectively, and lowering energy consumption. Furthermore, under microwave excitation, metal catalysts maintain better stability. The microwave field can reduce carbon deposition and poisoning on the catalyst surface, extending the catalyst's lifespan.

[0031] Example 2: Figure 2 A circulating air pump 8 is fixedly installed on the top of the reactor 1. An air inlet channel 9 is fixedly installed at the air inlet of the circulating air pump 8. The end of the air inlet channel 9 away from the circulating air pump 8 is fixedly connected to the air outlet pipe 5. An air outlet channel 10 is fixedly installed at the air outlet of the circulating air pump 8. One end of the air outlet channel 10 extends into the interior of the reactor 1 and is located between the air distribution mesh plate 7 and the mesh Fe-Mn bimetallic catalyst 3.

[0032] The circulating air pump 8 is existing technology. When the flue gas passes through the mesh Fe-Mn bimetallic catalyst 3 and enters the outlet pipe 5, it can draw in the flue gas through the inlet channel 9 and then input it into the reactor 1 through the outlet channel 10 for re-treatment of the flue gas, thereby improving the degree of flue gas treatment.

[0033] Example 3: Figure 3 and Figure 4 The exhaust pipe 5 is equipped with an exhaust solenoid valve 11 and a flue gas detection device 12. The flue gas detection device 12 and the solenoid valve 11 are located on both sides of the exhaust pipe 5. The flue gas detection device 12 is existing technology and can detect the components in the flue gas to determine whether the flue gas treatment meets the standards. If the flue gas treatment is not up to standard, the solenoid valve 11 can be closed, and the flue gas can be recirculated into the interior of the reactor 1 for treatment by the action of the circulating air pump 8.

[0034] like Figure 3 and Figure 4 A drain pipe 13 is installed on one side of the reactor 1. A control valve 131 is installed on the drain pipe 13. The control valve 131 is an electrically controlled valve or a manually controlled valve. If water is produced inside the reactor 1, the control valve 131 can be opened to discharge the water through the drain pipe 13.

[0035] like Figure 3 and Figure 4The intake pipe 4 is detachably connected to a filter screen 14. The filter screen 14 can be connected to the intake pipe 4 by bolts or snaps. A limiting ring 15 is fixedly installed inside the intake pipe 4 and on one side of the filter screen 14, so that when the flue gas enters, it will first pass through the filter screen 14 to filter out large particulate impurities in the flue gas. The limiting ring 15 has an opening in the center, which can prevent the filter screen 14 from going deep into the intake pipe 4 without affecting the entry of the flue gas.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. An environmentally friendly flue gas treatment device, comprising a reaction vessel (1), characterized in that, The top of the inner wall of the reactor (1) is equipped with a microwave generator (2) arranged in a linear array. The microwave generator (2) is used to excite nitrogen oxides in the flue gas. The reactor (1) is equipped with a mesh Fe-Mn bimetallic catalyst (3) arranged in a linear array. The outer surface of the mesh Fe-Mn bimetallic catalyst (3) is fixedly connected to the inner surface of the reactor (1). The mesh Fe-Mn bimetallic catalyst (3) and the microwave generator (2) are arranged alternately. The mesh Fe-Mn bimetallic catalyst (3) is used to react nitrogen oxides with oxidizing substances present in the flue gas to produce nitrates and nitrites. The reactor (1) is provided with an inlet pipe (4) and an outlet pipe (5) at both ends. A booster fan (6) is fixedly installed inside the outlet pipe (5). The booster fan (6) is used to discharge the flue gas inside the reactor (1). A uniform air distribution plate (7) is fixedly installed inside the reactor (1) near the inlet pipe (4).

2. The environmentally friendly flue gas treatment device according to claim 1, characterized in that, The reactor (1) near the outlet pipe (5) is designed with a funnel shape to improve the smoothness of flue gas passing through the reactor (1).

3. The environmentally friendly flue gas treatment device according to claim 1, characterized in that, A circulating air pump (8) is fixedly installed on the top of the reactor (1). An air inlet channel (9) is fixedly installed at the air inlet of the circulating air pump (8). The end of the air inlet channel (9) away from the circulating air pump (8) is fixedly connected to the air outlet pipe (5). An air outlet channel (10) is fixedly installed at the air outlet of the circulating air pump (8). One end of the air outlet channel (10) extends into the interior of the reactor (1) and is located between the air distribution mesh plate (7) and the mesh Fe-Mn bimetallic catalyst (3).

4. An environmentally friendly flue gas treatment device according to any one of claims 2 and 3, characterized in that, The exhaust pipe (5) is equipped with an exhaust solenoid valve (11) and a flue gas detection device (12), with the flue gas detection device (12) and the solenoid valve (11) located on both sides of the exhaust pipe (5).

5. The environmentally friendly flue gas treatment device according to claim 4, characterized in that, A drain pipe (13) is installed on one side of the reactor (1), and a control valve (131) is provided on the drain pipe (13).

6. The environmentally friendly flue gas treatment device according to claim 5, characterized in that, A filter cylinder (14) is detachably connected inside the air intake pipe (4), and a limiting ring (15) is fixedly installed inside the air intake pipe (4) and on one side of the filter cylinder (14).

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