A denitration device for treating exhaust gas

Abstract

The utility model relates to denitration device technical field discloses a kind of denitration devices for treating waste gas, including reaction box, air duct, intake pipe network and rotating jet integrated pipe, reaction box is equipped with inner chamber, reaction box side wall is connected air duct near top surface, reaction box side wall connects intake pipe network, intake pipe network is equipped with multiple jet ports, and the jet port of intake pipe network passes through reaction box side wall and enters inner chamber.The utility model makes rotating jet integrated pipe rotate and spray in reaction box, can produce the effect of disturbing flow to tail gas, and through rotating and improving spraying effect, let tail gas and reaction gas reaction be more uniform, to improve denitration efficiency, effectively reduce nitrogen oxides emission, satisfy environmental protection requirement.

Description

Technical Field

[0001] This utility model relates to the field of denitrification device technology, specifically a denitrification device for treating waste gas. Background Technology

[0002] With rapid industrial development, large amounts of industrial waste gas are emitted into the atmosphere, among which nitrogen oxides (NOx) are one of the major air pollutants. NOx emissions not only contribute to acid rain, causing serious damage to soil, water bodies, and vegetation, but also participate in the formation of photochemical smog, harming human health and causing respiratory diseases. Therefore, effective treatment of NOx in industrial waste gas has become an urgent need in the field of environmental protection. Currently, common waste gas denitrification technologies mainly include selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). SCR technology uses a reducing agent (such as ammonia or urea) to reduce NOx to nitrogen and water under the action of a catalyst. This technology has high denitrification efficiency, but the catalyst cost is high, and it has certain requirements on reaction temperature and waste gas composition, resulting in relatively high operation and maintenance costs. SNCR technology, on the other hand, involves directly injecting a reducing agent into the high-temperature waste gas without a catalyst, causing the NOx to undergo a reduction reaction. SNCR technology has simple equipment and lower investment costs, but its denitrification efficiency is relatively low, and the utilization rate of the reducing agent is not high, easily causing secondary pollution.

[0003] Furthermore, existing denitrification devices typically use fixed nozzles to spray the reducing agent. This method suffers from uneven spraying, resulting in incomplete mixing and reaction between the exhaust gas and the reducing agent, thus affecting the denitrification effect. Simultaneously, fixed nozzles cannot create turbulence in the exhaust gas, leading to a relatively uniform flow pattern within the reaction device, further limiting the completeness of the reaction. Therefore, developing a denitrification device that can improve the uniformity of reducing agent spraying, enhance the turbulence effect on exhaust gas, and improve denitrification efficiency is of significant practical importance.

[0004] To address the aforementioned issues, we propose a denitrification device for treating waste gas. Utility Model Content

[0005] The purpose of this invention is to provide a denitrification device for treating waste gas, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a denitrification device for treating waste gas, comprising a reaction chamber, a ventilation pipe, an air inlet network, and a rotating jet integrated pipe; The reaction chamber has an inner cavity; the side wall of the reaction chamber is connected to the ventilation pipe near the top surface; the side wall of the reaction chamber is connected to the air intake network; the air intake network has multiple air jets; the air jets of the air intake network pass through the side wall of the reaction chamber and enter the inner cavity.

[0007] Preferably, the intake duct network includes a main duct, a secondary duct, a jet duct, and a docking duct; One end of the main pipe is connected to the evaporator; multiple secondary pipes are connected to the side wall of the main pipe; the multiple secondary pipes are arranged around the side wall of the reaction chamber; multiple jet pipes are evenly connected to the side wall of the secondary pipes; the jet nozzle of the jet pipe passes through the side wall of the reaction chamber and enters the inner cavity; multiple docking pipes are also connected to the side wall of the secondary pipes; a rotating jet integrated pipe is rotatably connected between two docking pipes.

[0008] Preferably, the rotating jet tube includes a rotating chamber, a jet nozzle, a guide vane, and a rotating joint; The rotating chamber has a plurality of jet nozzles evenly distributed on its outer circumferential wall; the rotating chamber also has a guide vane on its outer circumferential wall; an opening is formed on one side wall of the guide vane; a guide cavity is formed on the guide vane; the guide cavity of the guide vane is connected to the opening; the jet nozzle is provided inside the guide cavity of the guide vane; a rotary joint is connected to each end of the rotating chamber; the rotary joint is connected to the docking pipe.

[0009] Preferably, at least two rotating jet tubes are provided in the inner cavity of the reaction chamber; two adjacent rotating jet tubes are arranged in opposite directions.

[0010] Preferably, the ventilation duct is equipped with multiple speed-reducing plates.

[0011] Preferably, the outer wall of the reaction chamber is provided with an air inlet flange near the bottom; the inner wall of the reaction chamber is provided with multiple guide plates near the air inlet flange; and the inner wall of the reaction chamber is provided with multiple guide plates near the ventilation pipe. Compared with the prior art, the beneficial effects of this utility model are: Improve spray uniformity: The rotating jet pipe rotates within the reaction chamber, and the jet nozzles on it can spray the reaction gas into the exhaust gas from all directions and multiple angles, so that the reaction gas and exhaust gas are fully mixed, improving the spray uniformity and thus enhancing the reaction effect.

[0012] Enhanced turbulence effect: The rotation of the integrated jet pipe can create turbulence in the exhaust gas, changing the flow state of the exhaust gas in the reaction chamber, allowing the exhaust gas and the reaction gas to come into more full contact and react, thereby further improving the denitrification efficiency.

[0013] Optimized airflow distribution: Multiple speed-reducing plates installed inside the ventilation duct can reduce the flow rate of the exhaust gas, extending the residence time of the exhaust gas in the reaction chamber. At the same time, the guide plates installed on the inner wall of the reaction chamber can guide the exhaust gas to flow evenly, optimizing the airflow distribution and facilitating the full reaction. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main sectional view of the structure of this utility model; Figure 2 This is a schematic front view of the rotating jet integrated tube in this utility model; Figure 3 This is an isometric cross-sectional view of the ventilation pipe in this utility model.

[0015] In the diagram: 1-Reaction chamber, 11-Inlet flange, 2-Ventilation pipe, 21-Speed ​​reduction plate, 3-Inlet pipe network, 31-Main pipe, 32-Secondary pipe, 33-Jet pipe, 34-Connecting pipe, 4-Rotating jet integrated pipe, 41-Rotating chamber, 42-Jet nozzle, 43-Guide, 44-Rotating joint. Detailed Implementation

[0016] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figure 1 , Figure 2 , Figure 3 This utility model provides a technical solution: a denitrification device for treating waste gas, suitable for selective catalytic reduction (SCR) technology, including a reaction chamber 1, a ventilation pipe 2, an air inlet network 3, and a rotating jet integrated pipe 4; The reaction chamber 1 has an inner cavity, providing a closed space for the reaction of waste gas and reactant gas. The side wall of the reaction chamber 1 near the top is connected to the ventilation pipe 2 for discharging the treated gas. The side wall of the reaction chamber 1 is connected to the air inlet pipe network 3, which has multiple jet nozzles that pass through the side wall of the reaction chamber 1 and enter the inner cavity to inject the reactant gas into the reaction chamber 1 to react with the waste gas.

[0018] The intake duct network 3 includes a main duct 31, secondary ducts 32, jet ducts 33, and connecting ducts 34. One end of the main duct 31 is connected to an evaporator to obtain the vaporized reaction gas. Multiple secondary ducts 32 are connected to the sidewall of the main duct 31, and these secondary ducts 32 are arranged around the sidewall of the reaction chamber 1. This arrangement allows the reaction gas to be distributed more evenly around the reaction chamber 1. Multiple jet ducts 33 are evenly connected to the sidewall of the secondary ducts 32. The jet nozzles of the jet ducts 33 pass through the sidewall of the reaction chamber 1 and enter the inner cavity, achieving a preliminary jet reaction. Multiple connecting ducts 34 are also connected to the sidewall of the secondary ducts 32. A rotating jet integrated pipe 4 is rotatably connected between two connecting ducts 34, providing the rotating jet integrated pipe 4 with the reaction gas and enabling its rotatable connection.

[0019] The rotating jet integration pipe 4 includes a rotating chamber 41, jet nozzles 42, a guide vane 43, and a rotary joint 44. Multiple jet nozzles 42 are evenly distributed on the outer circumferential wall of the rotating chamber 41, enabling the spraying of reaction gas into the reaction chamber 1 from multiple directions. The outer circumferential wall of the rotating chamber 41 also has a guide vane 43, with an opening on one side wall and a guide cavity connected to the opening. The jet nozzles 42 are located within the guide cavity of the guide vane 43.

[0020] This design allows the reactive gas to expand its spray range and change its spray direction by means of the guide vane 43 when it is ejected, enhancing the mixing effect with the exhaust gas. It also guides the gas ejected directly from the nozzle 42, thereby generating rotational force in the rotating chamber 41. A rotary joint 44 is connected to each end of the rotating chamber 41, and the rotary joint 44 connects to the docking pipe 34, realizing the transport of the reactive gas and the rotation of the rotating chamber 41.

[0021] The number and arrangement of the rotating jet integrated pipes 4: At least two rotating jet integrated pipes 4 are provided in the inner cavity of the reaction chamber 1, and two adjacent rotating jet integrated pipes 4 are arranged in opposite directions. This arrangement can create turbulence in different directions within the reaction chamber 1, resulting in a more complex flow state of the exhaust gas within the reaction chamber 1, and further improving the mixing uniformity of the exhaust gas and the reaction gas.

[0022] Moreover, the two rotating jet tubes 4, with their different rotational directions, can assist each other, further enhancing the rotational force, without requiring an external drive device.

[0023] The ventilation duct 2 features a special design: it is equipped with multiple speed-reducing plates 21. These speed-reducing plates 21 lower the flow velocity of the exhaust gas within the ventilation duct 2, allowing the exhaust gas sufficient residence time within the reaction chamber 1 to ensure a complete reaction and improve the denitrification effect.

[0024] The air intake and flow guiding design of the reaction chamber 1 is as follows: An air intake flange 11 is located on the outer wall of the reaction chamber 1 near the bottom surface, for connecting to an exhaust gas intake pipe to introduce exhaust gas into the reaction chamber 1. Multiple flow guides are located on the inner wall of the reaction chamber 1 near the air intake flange 11, which guides the exhaust gas evenly into the reaction chamber 1, preventing exhaust gas from accumulating in localized areas. Multiple flow guides are also located on the inner wall of the reaction chamber 1 near the ventilation pipe 2, which guides the reacted gas smoothly towards the ventilation pipe 2, optimizing airflow distribution.

[0025] The core principle of the exhaust gas denitrification device is to convert nitrogen oxides (NOx) in the exhaust gas into harmless nitrogen (N2) and water (H2O) through a reducing agent (such as ammonia or urea) under the action of a catalyst. It is mainly divided into two technical routes: selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). This utility model is applicable to selective catalytic reduction (SCR). SCR technology is the mainstream solution and has high efficiency.

[0026] In the presence of a catalyst (such as vanadium-based, titanium-based, or zeolite), ammonia (NH3) reacts with NOx in the exhaust gas in a redox reaction within a temperature range of 200-450℃ to produce nitrogen and water.

[0027] Example of a reaction formula: 4NO + 4NH3 + O2 → 4N2 + 6H2O; NO + NO2 + 2NH3 → 2N2 + 3H2O; Ammonia supply: After liquid ammonia is vaporized by the evaporator, it is mixed with air and diluted to a volume concentration of 5%, and then evenly injected into the upstream flue of the SCR reactor through the ammonia injection grid (AIG).

[0028] Mixing and guiding: The flue gas passes through a static mixer or guide plate to ensure that the ammonia and exhaust gas are fully mixed and to prevent local ammonia escape.

[0029] Catalytic reaction: The mixed gas enters the SCR reactor and reacts in the catalyst layer, with NOx conversion rate reaching 80%~95%.

[0030] Temperature control: The flue gas temperature is regulated by the economizer bypass to ensure that the reaction takes place within the optimal temperature window (e.g., 370℃~440℃).

[0031] Soot blowing and maintenance: Regularly blow the catalyst layer with compressed air to prevent fly ash blockage; the catalyst life is usually 3 to 5 years and needs to be replaced regularly.

[0032] A complete selective catalytic reduction (SCR) reaction also requires the following: Ammonia supply system: including liquid ammonia storage tank, evaporator, ammonia-air mixer and flow control valve, to ensure accurate ammonia injection.

[0033] Flow guiding device: Located at the reactor inlet, it guides the flue gas to distribute evenly and avoids flow deviation.

[0034] Temperature control system: The temperature sensor monitors the flue gas temperature in real time and automatically adjusts the heating or cooling devices to maintain the optimal reaction temperature.

[0035] The above content refers to existing technology and will not be elaborated further.

[0036] Working principle: Industrial waste gas enters the inner cavity of the reaction chamber 1 through the inlet flange 11. Simultaneously, the evaporator heats and vaporizes the reducing agent, which is then transported to the various auxiliary pipes 32 via the main pipe 31. A portion of the reducing agent is initially sprayed into the waste gas through the jet pipe 33, while another portion enters the rotating chamber 41 of the rotating jet integrated pipe 4 through the docking pipe 34. Driven by the gas ejected from the jet nozzle 42, the rotating jet integrated pipe 4 begins to rotate. The guide vane 43 guides the gas ejected directly from the jet nozzle 42, thereby providing rotational power.

[0037] The reducing agent in the rotating chamber 41 is sprayed into the exhaust gas from all directions and at multiple angles through the jet nozzle 42. At the same time, the rotation of the rotating jet integrated pipe 4 creates a turbulent effect on the exhaust gas, so that the exhaust gas and the reducing agent are fully mixed and reacted.

[0038] The reacted gas is discharged through the ventilation pipe 2. The speed-reducing plate 21 inside the ventilation pipe 2 reduces the gas flow rate, allowing the reaction to proceed more completely. The nitrogen oxide content in the treated waste gas is significantly reduced, meeting environmental emission requirements.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A denitrification device for treating waste gas, characterized in that, It includes a reaction chamber (1), a ventilation pipe (2), an air inlet network (3), and a rotating jet integrated pipe (4); The reaction chamber (1) has an inner cavity; the side wall of the reaction chamber (1) is connected to the ventilation pipe (2) near the top surface; the side wall of the reaction chamber (1) is connected to the air inlet network (3); the air inlet network (3) has multiple air jets; the air jets of the air inlet network (3) pass through the side wall of the reaction chamber (1) and enter the inner cavity.

2. The denitrification device for treating waste gas according to claim 1, characterized in that, The intake network (3) includes a main pipe (31), a secondary pipe (32), a jet pipe (33), and a docking pipe (34); One end of the main pipe (31) is connected to the evaporator; the side wall of the main pipe (31) is connected to a plurality of the secondary pipes (32); the plurality of the secondary pipes (32) are arranged around the side wall of the reaction chamber (1); the side wall of the secondary pipes (32) is evenly connected to a plurality of the jet pipes (33); the jet nozzle of the jet pipe (33) passes through the side wall of the reaction chamber (1) and enters the inner cavity; the side wall of the secondary pipes (32) is also connected to a plurality of the docking pipes (34); the rotating jet integrated pipe (4) is rotatably connected between two docking pipes (34).

3. The denitrification device for treating waste gas according to claim 2, characterized in that, The rotating jet tube (4) includes a rotating chamber (41), a jet nozzle (42), a guide vane (43), and a rotating joint (44). The rotating chamber (41) has a plurality of jet nozzles (42) evenly arranged on its outer circumferential wall; the rotating chamber (41) also has a guide vane (43) on its outer circumferential wall; the guide vane (43) has an opening on one side wall; the guide vane (43) has a guide cavity; the guide cavity of the guide vane (43) is connected to the opening; the jet nozzles (42) are arranged in the guide cavity of the guide vane (43); a rotary joint (44) is connected to each end of the rotating chamber (41); the rotary joint (44) is connected to the docking pipe (34).

4. A denitrification device for treating waste gas according to claim 2, characterized in that, The reaction chamber (1) is provided with at least two of the rotating jet tubes (4); two adjacent rotating jet tubes (4) are arranged in opposite directions.

5. A denitrification device for treating waste gas according to claim 1, characterized in that, The ventilation duct (2) is equipped with multiple speed-reducing plates (21).

6. A denitrification device for treating waste gas according to claim 1, characterized in that, The outer side wall of the reaction chamber (1) is provided with an air inlet flange (11) near the bottom; the inner side wall of the reaction chamber (1) is provided with multiple guide plates near the air inlet flange (11); the inner side wall of the reaction chamber (1) is provided with multiple guide plates near the ventilation pipe (2).

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