An in-furnace denitrification device and method

Abstract

This invention discloses an in-furnace denitrification device and method. The device includes a driving component, a hollow transmission rod, a compressed air pipe, a gas collecting chamber, a gas outlet chamber, a reducing agent chamber, and a spray gun. The driving component drives the hollow transmission rod to rotate. The inlet of the hollow transmission rod is connected to the compressed air pipe, and the outlet is connected to the gas collecting chamber. The inlet of the gas outlet chamber is connected to the gas collecting chamber, and the outlet is connected to the spray gun. The reducing agent chamber is connected to the spray gun. A baffle plate is provided at the outlet of the hollow transmission rod, forming a pulse airflow generating port between the outlet of the hollow transmission rod and the baffle plate. The gas outlet chamber and the hollow transmission rod are staggered. The projections of the inlet of the gas outlet chamber and the pulse airflow generating port on a plane perpendicular to the axis of the hollow transmission rod overlap. The area of ​​the overlapping region changes periodically with the rotation of the hollow transmission rod. This invention has the advantages of high denitrification efficiency, low ammonia slip rate, reliable structure, long service life, stable and controllable pulse waveform, and convenient and flexible adjustment.

Description

Technical Field

[0001] This invention relates to the field of in-furnace denitrification technology, and in particular to an in-furnace denitrification device and method. Background Technology

[0002] SNCR (Selective Non-Catalytic Reduction) denitrification technology is a widely used process for flue gas denitrification in coal-fired boilers, waste incinerators, and other similar facilities. Its core principle involves injecting a reducing agent (ammonia or urea solution) into the flue gas within a suitable temperature window (typically 850℃-1100℃). This allows the reducing agent to undergo a selective non-catalytic reduction reaction with nitrogen oxides (NOx) in the flue gas, producing harmless nitrogen (N2) and water (H2O). The atomization effect of the reducing agent and its mixing uniformity with the flue gas are key factors determining the denitrification efficiency and ammonia slip rate. Currently, most SNCR systems use compressed air at constant pressure to atomize the reducing agent through a spray gun.

[0003] In existing SNCR denitrification technologies, the spray gun uses compressed air at constant pressure to atomize the reducing agent (such as ammonia or urea solution), which presents a significant problem: uneven distribution of the atomized reducing agent in the flue gas. This leads to incomplete reaction with nitrogen oxides in areas with low reducing agent concentration, resulting in reduced denitrification efficiency; while in areas with excessive reducing agent, ammonia escape (unreacted ammonia is released into the atmosphere) is prone to occur, not only wasting reducing agent and increasing operating costs but also posing environmental pollution risks. Furthermore, constant pressure injection lacks dynamic adjustment capabilities and cannot adapt to changes in flue gas flow rate or concentration, further exacerbating the problem of uneven mixing.

[0004] To improve mixing, several existing technologies attempt to modify the compressed air supply method: 1. Variable frequency control of air supply: Adjusting the speed of the compressed air fan via a frequency converter changes the total air volume supplied to the spray gun. This method can adjust the atomization intensity to some extent, but it essentially provides a change in average flow rate; the pressure itself remains relatively stable and cannot generate strong, periodic turbulent disturbances to promote micro-mixing. 2. Pulse valve control: Installing an electromagnetic pulse valve on the compressed air pipeline generates pulsed airflow by controlling the rapid opening and closing of the valve. This method can generate pressure fluctuations, but its waveform is usually a square wave (sharp rise and fall), with limited frequency and amplitude adjustment range. Furthermore, valve lifespan and reliability are challenged at high frequencies. More importantly, pulse valves are usually installed on main or branch lines, far from the spray gun, causing pressure pulses to attenuate and distort during transmission, weakening the pulsation effect at the spray gun. 3. Mechanical rotary atomizer: Some solutions use a motor to directly drive the atomizing disc or nozzle rotation. While this method can improve atomization uniformity, it is usually structurally complex, directly exposing rotating parts to a high-temperature, high-dust, and corrosive flue gas environment. It places extremely high demands on the sealing, cooling, and wear resistance of the motor and bearings, resulting in high maintenance costs and significant reliability risks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an in-furnace denitrification device with high denitrification efficiency, low ammonia slip rate, reliable structure, long service life, stable and controllable pulse waveform, and convenient and flexible adjustment, and also provides a denitrification method.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An in-furnace denitrification device includes a drive component, a hollow transmission rod, a compressed air pipe, a gas collecting chamber, a gas outlet chamber, a reducing agent chamber, and a spray gun. The drive component drives the hollow transmission rod to rotate. The inlet of the hollow transmission rod is connected to the compressed air pipe, and the outlet is connected to the gas collecting chamber. The inlet of the gas outlet chamber is connected to the gas collecting chamber, and the outlet is connected to the spray gun. The reducing agent chamber is connected to the spray gun. The outlet of the hollow transmission rod is provided with a baffle plate, and a pulse airflow generating port is formed between the outlet of the hollow transmission rod and the baffle plate. The gas outlet chamber is staggered with the hollow transmission rod. The projections of the inlet of the gas outlet chamber and the pulse airflow generating port on a plane perpendicular to the axis of the hollow transmission rod have an overlapping area. The area of ​​the overlapping area changes periodically with the rotation of the hollow transmission rod.

[0007] As a further improvement to the above technical solution: The shield is elliptical in shape.

[0008] The baffle plate and the outlet of the hollow transmission rod are arranged concentrically.

[0009] An installation plate is fitted on the outer side of the hollow transmission rod outlet, and the shielding plate is fixedly connected to the installation plate through multiple connectors.

[0010] The connector is provided in four parts, with two connectors located on both sides of the long axis of the baffle and the other two connectors located on both sides of the short axis of the baffle.

[0011] The outlet of the hollow transmission rod extends into the gas collecting chamber and is rotary sealed with the gas collecting chamber through a sealing gasket.

[0012] The compressed air pipe is rotatably sealed to the hollow transmission rod via a sealing gasket.

[0013] The driving component drives the hollow transmission rod to rotate via a reduction gear and a hollow transmission rod.

[0014] The outlet of the air chamber is connected to the spray gun via an air outlet pipe.

[0015] A denitrification method based on the above-mentioned in-furnace denitrification device includes the following steps: Step S1: Collect measured values ​​of nitrogen oxide emissions N, ammonia slip rate ε, and reaction zone temperature T; Step S2: Determine the temperature T in the reaction zone. If T < 850℃, increase the speed of the drive component; if T > 950℃, decrease the speed of the drive component; if 850℃ ≤ T ≤ 950℃, proceed to step S3. Step S3: Compare the nitrogen oxide emission value N with the target nitrogen oxide emission value N m The difference ΔN is used to determine the ammonia slip rate ε and the target ammonia slip rate ε. m The difference Δε is calculated. If both ΔN and Δε are within the target range, the rotational speed of the drive component remains unchanged; if ΔN and / or Δε are not within the target range, the rotational speed is adjusted according to the difference between the nitrogen oxide emission value N and the target nitrogen oxide emission value N. m The deviation ratio and / or ammonia slip rate ε compared with the target ammonia slip rate ε m The deviation ratio is used to adjust the speed of the drive component.

[0016] Compared with the prior art, the advantages of the present invention are as follows: 1. The in-furnace denitrification device of the present invention enhances the diffusion ability, penetration depth, and micro-mixing effect of the reducing agent atomization field in the flue gas by acting on the reducing agent with pulsed compressed air. This results in more uniform mixing of the reducing agent and sufficient contact between the reducing agent and nitrogen oxides at all points of the flue gas cross-section, improving the completeness of the denitrification reaction, i.e., the denitrification efficiency. The improved mixing uniformity directly reduces the phenomenon of excessive reducing agent in local areas, and the reducing agent is more rationally distributed in the flue gas, reducing the amount of ammonia that escapes from the reaction zone without being utilized. This effectively reduces the ammonia escape rate, thereby reducing environmental pollution and saving reducing agent consumption and costs. The pulse generation is achieved through a purely mechanical rotating structure, compared to the need for exposure to high temperatures. Electronic pulse valves or high-speed rotating atomizing discs in flue gas operate in a relatively mild environment, are structurally reliable, run stably, require low maintenance, and have a long service life. The pulsed airflow is mechanically generated directly at the air supply end of the spray gun, avoiding pressure wave attenuation and waveform distortion caused by long-distance pipeline transmission, resulting in minimal attenuation. By designing the geometry of the pulsed airflow generator, the characteristics of the output pressure waveform (such as amplitude and rise / fall slope) can be customized, ensuring a smooth and controllable pulse waveform. By setting a suitable rotation speed for the drive component, pulsating airflow can be automatically and continuously generated, eliminating the need for frequent manual adjustments to constant pressure or pulse valve parameters to adapt to changes in operating conditions, reducing manual intervention. Furthermore, the pulse frequency can be adjusted by regulating the rotation speed of the drive component, making adjustment convenient and flexible.

[0017] 2. In the in-furnace denitrification device of the present invention, the pulse airflow generating port is annular, and the width of the pulse airflow generating port changes periodically. When the maximum width of the pulse airflow generating port is aligned with the inlet of the outlet chamber, the overlap area is the largest, and the airflow is unobstructed. When the minimum width of the pulse airflow generating port is aligned with the inlet of the outlet chamber, the overlap area is the smallest, and the airflow is restricted. This makes the pulse airflow from the gas collecting chamber to the outlet chamber fluctuate in a sinusoidal manner, and the pulse is smooth and stable.

[0018] 3. The in-furnace denitrification method of the present invention achieves dynamic adaptation of SNCR by coordinating the speed regulation of three parameters: nitrogen oxide emission value N, ammonia slip rate ε, and reaction zone temperature T, thereby improving denitrification efficiency and reducing ammonia slip rate. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the in-furnace denitrification device of the present invention.

[0020] Figure 2 This is a cross-sectional view of the outlet of the hollow transmission rod in the furnace denitrification device of the present invention.

[0021] Figure 3 This is a waveform diagram of the pulsed airflow pressure in the in-furnace denitrification device of the present invention.

[0022] Figure 4 This is a schematic diagram of the spray gun in the furnace denitrification device of the present invention spraying under different pulse airflow pressures.

[0023] Figure 5 This is a flowchart of the in-furnace denitrification method of the present invention.

[0024] Legend: 1. Drive unit; 10. Reducing agent chamber; 11. Spray gun; 12. Baffle plate; 13. Mounting plate; 14. Connector; 2. Reduction gear; 3. Hollow transmission rod; 4. Compressed air pipe; 5. Pulse airflow generator; 6. Gas collection chamber; 7. Sealing gasket; 8. Gas outlet chamber; 9. Gas outlet pipe. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] Example 1: like Figures 1 to 4 As shown, the in-furnace denitrification device of this embodiment includes a driving component 1, a hollow transmission rod 3, a compressed air pipe 4, a gas collecting chamber 6, a gas outlet chamber 8, a reducing agent chamber 10, and a spray gun 11. The driving component 1 is used to drive the hollow transmission rod 3 to rotate. The inlet of the hollow transmission rod 3 is connected to the compressed air pipe 4, and the outlet is connected to the gas collecting chamber 6. The inlet of the gas outlet chamber 8 is connected to the gas collecting chamber 6, and the outlet is connected to the spray gun 11. The reducing agent chamber 10 is connected to the spray gun 11. The outlet of the hollow transmission rod 3 is provided with a baffle plate 12. A pulse airflow generating port 5 is formed between the outlet of the hollow transmission rod 3 and the baffle plate 12. The gas outlet chamber 8 is staggered with the hollow transmission rod 3. The projections of the inlet of the gas outlet chamber 8 and the pulse airflow generating port 5 on the plane perpendicular to the axis of the hollow transmission rod 3 have an overlapping area. The area of ​​the overlapping area changes periodically with the rotation of the hollow transmission rod 3.

[0030] In this embodiment of the in-furnace denitrification device, during operation, compressed air enters the hollow drive rod 3 from the compressed air pipe 4. Part of the airflow in the hollow drive rod 3 is blocked by the baffle plate 12, while the other part flows out from the pulse airflow generator 5 to the gas collecting chamber 6. Due to the misaligned arrangement of the outlet chamber 8 and the hollow drive rod 3 (i.e., their non-coaxial alignment), when the hollow drive rod 3 rotates, the overlapping area (i.e., the effective flow area) of the inlet of the outlet chamber 8 and the projection of the pulse airflow generator 5 onto the plane perpendicular to the axis of the hollow drive rod 3 is [not specified]. The periodic changes mean that when the overlapping area is small, the airflow is restricted, and when the overlapping area is large, the airflow is unobstructed. This causes the compressed air flow rate and pressure from the gas collection chamber 6 to the gas outlet chamber 8 to fluctuate periodically, forming a pulsed airflow. The pulsed airflow in the gas outlet chamber 8 enters the spray gun 11. Inside the spray gun 11, the pulsed airflow meets the reducing agent (such as ammonia) in the reducing agent chamber 10, causing the reducing agent to oscillate and tear, forming a finer and more dynamically changing atomized field. Then, the two are sprayed into the flue and mixed with the flue gas to carry out the denitrification reaction.

[0031] The in-furnace denitrification device in this embodiment uses pulsed compressed air to act on the reducing agent, enhancing the diffusion ability, penetration depth, and micro-mixing effect of the reducing agent atomization field in the flue gas. This results in more uniform mixing of the reducing agent, ensuring sufficient contact between the reducing agent and nitrogen oxides at all points along the flue gas cross-section, and improving the completeness of the denitrification reaction, i.e., the denitrification efficiency. The improved mixing uniformity directly reduces the phenomenon of excessive reducing agent in local areas, and the more reasonable distribution of the reducing agent in the flue gas reduces the amount of ammonia that escapes from the reaction zone without being utilized, thereby effectively reducing the ammonia escape rate. This reduces environmental pollution and saves reducing agent consumption, thus saving reducing agent costs. The pulse generation is achieved through a purely mechanical rotating structure, compared to devices that need to be exposed to high-temperature flue gas. The electronic pulse valve or high-speed rotating atomizing disc operates in a relatively mild environment, has a reliable structure, stable operation, low maintenance requirements, and a long service life. The pulse airflow is directly and mechanically generated at the air supply end of the spray gun 11, avoiding pressure wave attenuation and waveform distortion caused by long-distance pipeline transmission, resulting in minimal attenuation. By designing the geometry of the pulse airflow generating port 5, the characteristics of the output pressure waveform (such as amplitude and rise / fall slope) can be customized, and the pulse waveform is stable and controllable. By setting a suitable speed for the drive component 1, the pulsating airflow can be automatically and continuously generated without the need for frequent manual adjustment of constant pressure or pulse valve parameters to adapt to changes in working conditions, reducing manual intervention. Furthermore, the pulse frequency can be adjusted by adjusting the speed of the drive component 1, making adjustment convenient and flexible.

[0032] Furthermore, such as Figure 2 As shown, in this embodiment, the baffle plate 12 is elliptical, and the baffle plate 12 and the outlet of the hollow transmission rod 3 are arranged concentrically. This makes the pulse airflow generating port 5 annular, and the width of the pulse airflow generating port 5 changes periodically. When the maximum width of the pulse airflow generating port 5 is aligned with the inlet of the exhaust chamber 8, the overlap area is the largest, and the airflow is unobstructed; when the minimum width of the pulse airflow generating port 5 is aligned with the inlet of the exhaust chamber 8, the overlap area is the smallest, and the airflow is restricted. This makes the pulse airflow from the gas collecting chamber 6 to the exhaust chamber 8 exhibit a sinusoidal fluctuation, with a smooth and stable pulse.

[0033] Furthermore, such as Figure 2 As shown, a mounting plate 13 is fitted onto the outer side of the outlet of the hollow transmission rod 3, and a baffle plate 12 is fixedly connected to the mounting plate 13 via multiple connectors 14. When the hollow transmission rod 3 rotates, it drives the baffle plate 12, the mounting plate 13, and the connectors 14 to rotate together, resulting in a stable structure.

[0034] Furthermore, in this embodiment, four connectors 14 are provided, with two connectors 14 (a1, a2) located on both sides of the long axis of the baffle plate 12, and the other two connectors 14 (b1, b2) located on both sides of the short axis of the baffle plate 12. Figure 3 and Figure 4As shown, when the connector 14 (a1, a2, i.e., the minimum ring width) is aligned with the inlet of the exhaust chamber 8, the overlap area is the smallest, the pulse pressure is the smallest, and the reductant atomization penetration is the weakest; when the connector 14 (b1, b2, i.e., the maximum ring width) is aligned with the inlet of the exhaust chamber 8, the overlap area is the largest, the pulse pressure is the largest, and the reductant atomization penetration is the strongest.

[0035] Furthermore, in this embodiment, the outlet of the hollow transmission rod 3 extends into the air collecting chamber 6 and is rotary sealed with the air collecting chamber 6 via a sealing gasket 7. The compressed air pipe 4 is rotary sealed with the hollow transmission rod 3 via a sealing gasket 7. By setting the sealing gasket 7, a dynamic seal is achieved between the hollow transmission rod 3 and the air collecting chamber 6 and the compressed air pipe 4, ensuring reliable sealing.

[0036] Furthermore, in this embodiment, the driving component 1 drives the hollow transmission rod 3 to rotate via a reduction gear 2 and a hollow transmission rod 3. By reducing the high speed of the driving component 1 (e.g., an electric motor) through the reduction gear 2, a lower speed with higher torque suitable for the operation of subsequent mechanisms is output, resulting in a simple and reliable structure.

[0037] Furthermore, in this embodiment, the outlet of the air chamber 8 is connected to the spray gun 11 through an air outlet pipe 9, which facilitates the arrangement of the position and angle of the spray gun 11.

[0038] Example 2: like Figure 5 As shown, the denitrification method of the in-furnace denitrification device based on Embodiment 1 in this embodiment includes the following steps: Step S1: Collect measured values ​​of nitrogen oxide emissions N, ammonia slip rate ε, and reaction zone temperature T; Step S2: Determine the temperature T in the reaction zone. If T < 850℃, increase the rotation speed of drive component 1; if T > 950℃, decrease the rotation speed of drive component 1; if 850℃ ≤ T ≤ 950℃, proceed to step S3. That is, when T < 850℃, increase the rotation speed of drive component 1 to increase the pulse frequency of the pulsed airflow and enhance atomization penetration; when T > 950℃, decrease the rotation speed of drive component 1 to decrease the pulse frequency of the pulsed airflow to avoid escape caused by excessive atomization. Step S3: Compare the nitrogen oxide emission value N with the target nitrogen oxide emission value N m The difference ΔN is used to determine the ammonia slip rate ε and the target ammonia slip rate ε. m The difference Δε is calculated. If both ΔN and Δε are within the target range, the rotational speed of drive component 1 remains unchanged; if ΔN and / or Δε are not within the target range, the rotational speed is adjusted according to the difference between the nitrogen oxide emission value N and the target nitrogen oxide emission value N. m The deviation ratio and / or ammonia slip rate ε compared with the target ammonia slip rate ε mThe deviation ratio adjusts the rotational speed of drive component 1. The target nitrogen oxide emission value N... m Target ammonia escape rate ε m The target ranges of ΔN and Δε can be set according to the actual application.

[0039] The denitrification method in this embodiment achieves dynamic adaptation of SNCR by coordinating the speed regulation of three parameters: nitrogen oxide emission value N, ammonia slip rate ε, and reaction zone temperature T, thereby improving denitrification efficiency and reducing ammonia slip rate.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the spirit and technical essence of the present invention. Therefore, any simple modifications, equivalent substitutions, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall still fall within the protection scope of the technical solutions of the present invention.

Claims

1. An in-furnace denitrification device, characterized in that: The system includes a drive unit (1), a hollow transmission rod (3), a compressed air pipe (4), a gas collecting chamber (6), a gas outlet chamber (8), a reducing agent chamber (10), and a spray gun (11). The drive unit (1) drives the hollow transmission rod (3) to rotate. The inlet of the hollow transmission rod (3) is connected to the compressed air pipe (4), and the outlet is connected to the gas collecting chamber (6). The inlet of the gas outlet chamber (8) is connected to the gas collecting chamber (6), and the outlet is connected to the spray gun (11). The reducing agent chamber (10) is connected to the spray gun (11). 11) Connected, the outlet of the hollow transmission rod (3) is provided with a baffle plate (12), and a pulse airflow generating port (5) is formed between the outlet of the hollow transmission rod (3) and the baffle plate (12). The air outlet chamber (8) is staggered with the hollow transmission rod (3). The inlet of the air outlet chamber (8) and the projection of the pulse airflow generating port (5) on the plane perpendicular to the axis of the hollow transmission rod (3) have an overlapping area. The area of ​​the overlapping area changes periodically with the rotation of the hollow transmission rod (3).

2. The in-furnace denitrification device according to claim 1, characterized in that: The shield (12) is elliptical.

3. The in-furnace denitrification device according to claim 2, characterized in that: The baffle plate (12) and the outlet of the hollow transmission rod (3) are arranged concentrically.

4. The in-furnace denitrification device according to claim 2, characterized in that: The hollow transmission rod (3) has an outer mounting plate (13) fitted on its outlet, and the shield (12) is fixedly connected to the mounting plate (13) by multiple connectors (14).

5. The in-furnace denitrification device according to claim 4, characterized in that: The connector (14) is provided in four parts, with two connectors (14) located on both sides of the long axis of the baffle (12) and the other two connectors (14) located on both sides of the short axis of the baffle (12).

6. The in-furnace denitrification device according to claim 1, characterized in that: The outlet of the hollow transmission rod (3) extends into the gas collecting chamber (6) and is rotated and sealed with the gas collecting chamber (6) through a sealing gasket (7).

7. The in-furnace denitrification device according to claim 1, characterized in that: The compressed air pipe (4) is rotated and sealed with the hollow transmission rod (3) through a sealing gasket (7).

8. The in-furnace denitrification device according to claim 1, characterized in that: The drive component (1) drives the hollow transmission rod (3) to rotate via a reduction gear (2) and a hollow transmission rod (3).

9. The in-furnace denitrification device according to any one of claims 1 to 8, characterized in that: The outlet of the air chamber (8) is connected to the spray gun (11) through an air outlet pipe (9).

10. A denitrification method based on the in-furnace denitrification device according to any one of claims 1 to 9, characterized in that: Includes the following steps: Step S1: Collect measured values ​​of nitrogen oxide emissions N, ammonia slip rate ε, and reaction zone temperature T; Step S2: Determine the temperature T in the reaction zone. If T < 850℃, increase the rotation speed of the drive unit (1); if T > 950℃, decrease the rotation speed of the drive unit (1); if 850℃ ≤ T ≤ 950℃, proceed to step S3. Step S3: Compare the nitrogen oxide emission value N with the target nitrogen oxide emission value N m The difference ΔN is used to determine the ammonia slip rate ε and the target ammonia slip rate ε. m If the difference Δε is within the target range, the rotational speed of the drive component (1) remains unchanged. If ΔN and / or Δε are not within the target range, the nitrogen oxide emission value N is compared with the target nitrogen oxide emission value N. m The deviation ratio and / or ammonia slip rate ε compared with the target ammonia slip rate ε m The deviation ratio adjusts the rotational speed of the drive component (1).

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