Denitration equipment for solving high ammonia escape in flue gas of waste incineration plant

Abstract

The utility model relates to denitration equipment for solving the problem of high ammonia escape in flue gas of a waste incineration plant, and aims to solve the technical problems that the mixing uniformity of ammonia gas and flue gas is poorer, the ammonia gas and the flue gas are non-uniformly mixed, local escape is increased and secondary pollution is caused because the ammonia gas is directly introduced to be mixed with the flue gas at present. The mixing mechanism comprises a denitration pipe fixedly connected between the upper end and the lower end of an inner cavity of the denitration tower and denitration particles used for flue gas denitration, the denitration pipe is provided with an ammonia gas pipe, the ammonia gas pipe is distributed in an S shape, a plurality of gas outlet holes are formed in the inner side of the ammonia gas pipe at equal intervals, the middle of the top end of the ammonia gas pipe is communicated with a gas inlet pipe, and the gas inlet pipe is communicated with a gas outlet pipe. According to the utility model, ammonia gas in the denitration pipe is uniformly distributed in the denitration pipe at equal intervals, and NOx in flue gas is fully contacted and mixed with the ammonia gas, so that the mixing uniformity of the ammonia gas and the flue gas is improved, and secondary pollution caused by local ammonia gas escape and rise due to non-uniform mixing of the ammonia gas and the flue gas is avoided.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification, specifically a denitrification device for solving the problem of high ammonia escape in flue gas from waste incineration plants. Background Technology

[0002] Waste-to-energy incineration technology has significant advantages in reducing volume, rendering harmless, and recycling municipal solid waste. In recent years, it has gradually replaced traditional waste treatment methods such as landfill and has been widely used in my country. The number and processing capacity of waste-to-energy incineration facilities have also increased year by year. Nitrogen oxides (NOx) are one of the main pollutants produced by waste incineration and are also one of the important causes of photochemical smog and acid rain. If they are not controlled and are allowed to be emitted in large quantities, they will pose a serious threat to the ecological environment and human health. Therefore, SCR flue gas denitrification devices are needed to denitrify the flue gas produced by waste incinerators.

[0003] In flue gas denitrification, ammonia (NH3) is introduced for selective catalytic reduction (SCR) or selective non-catalytic reduction (SNCR) processes. The core objective is to convert nitrogen oxides (NOx) in the flue gas into harmless nitrogen (N2) and water (H2O) through a chemical reaction. However, the traditional method of directly introducing ammonia into the flue gas mixture results in poor mixing uniformity, leading to localized escape and secondary pollution. Therefore, a new technical solution is needed to address this issue. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a denitrification device to solve the problem of high ammonia escape in the flue gas of waste incineration plants. This device addresses the technical problem that the current method of directly introducing ammonia into the flue gas mixture results in poor uniformity of ammonia mixing with the flue gas, leading to uneven mixing and increased local escape, causing secondary pollution.

[0005] To achieve the objective of this utility model, the technical solution adopted is as follows: A denitrification device is designed to address the high ammonia slip in flue gas from waste incineration plants, comprising:

[0006] The mixing mechanism includes a denitrification pipe fixedly connected between the upper and lower ends of the inner cavity of the denitrification tower and denitrification particles for flue gas denitrification. The denitrification pipe is provided with an ammonia pipe, which is S-shaped. Multiple air outlets are equidistantly opened on the inner side of the ammonia pipe. An air inlet pipe is connected to the middle of the top of the ammonia pipe. The air inlet pipe passes through the denitrification tower, and the connection between the air inlet pipe and the denitrification tower is connected by a sealed bearing, so that the air inlet pipe is rotatably connected to the denitrification tower while being sealed to the denitrification tower.

[0007] The drive mechanism is used to drive the rotation of the ammonia gas pipe.

[0008] Preferably, the drive mechanism includes a mounting bracket fixedly installed on the top of the denitrification tower, a drive motor fixedly installed on the inner top of the mounting bracket, a drive gear installed on the drive end of the drive motor, and a driven gear fixedly installed on the outer side of the air inlet pipe above the denitrification tower, wherein the drive gear meshes with the driven gear.

[0009] Preferably, a rotary joint is installed on the top of the air intake pipe, and the top of the air intake pipe is connected to the air intake pipe through a sealed bearing, so that the air intake pipe is rotatably connected to the rotary joint while being sealed to the rotary joint, and a connecting pipe is connected to the top of the rotary joint.

[0010] Preferably, a spiral blade is fixedly connected inside the denitrification pipe, and the ammonia pipe is placed in the middle of the spiral blade and does not contact the spiral blade.

[0011] Preferably, a flue gas inlet pipe is provided on the lower side of one end of the denitrification tower, and an exhaust pipe is provided on the upper side of the end of the denitrification tower away from the flue gas inlet pipe. The ends of the flue gas inlet pipe and the exhaust pipe near the denitrification tower both penetrate the denitrification tower and are connected to the denitrification pipe, and both the flue gas inlet pipe and the exhaust pipe are connected to the inner cavity of the denitrification pipe.

[0012] Preferably, an ammonia detector is installed on the exhaust pipe, the detection head of the ammonia detector passes through the exhaust pipe and is placed inside the exhaust pipe, and an electromagnetic valve is installed inside the connecting pipe.

[0013] Preferably, a filter screen is fixedly installed inside the air outlet, and the filter screen has a pore size smaller than the size of the denitrification particles.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] 1. This utility model combines a denitrification pipe, an ammonia pipe, a drive motor, a drive gear, an outlet, a driven gear, and an inlet pipe. Ammonia gas is introduced into the ammonia pipe through the inlet pipe, and then the ammonia gas is sprayed into the denitrification pipe through the outlet. Since the outlets are evenly distributed on the ammonia pipe, ammonia gas is sprayed out into the denitrification pipe at equal intervals. At this time, the drive motor is started to drive the drive gear to rotate, which in turn drives the ammonia pipe to rotate with the driven gear. This makes the ammonia gas in the denitrification pipe evenly distributed at equal intervals, so that the NOx in the flue gas can fully contact and mix with the ammonia gas, thereby improving the mixing uniformity of ammonia gas and flue gas, and thus avoiding the local ammonia gas escape and increase caused by uneven mixing of ammonia gas and flue gas, which would cause secondary pollution.

[0016] 2. This utility model combines an ammonia detector and a solenoid valve to control the solenoid valve when the ammonia content in the exhaust gas exceeds the normal ammonia escape level, thereby reducing the ammonia flow rate and ensuring that the ammonia is fully mixed with the NOx in the exhaust gas, thus reducing ammonia escape. Attached Figure Description

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

[0018] Figure 2 This is the overall sectional front view of the present invention;

[0019] Figure 3 This is a schematic diagram of the connection structure between the denitrification pipe, the spiral blade, and the ammonia pipe of this utility model.

[0020] In the diagram: 1. Denitrification tower; 11. Flue gas inlet pipe; 12. Exhaust pipe; 2. Mounting bracket; 21. Drive motor; 22. Drive gear; 23. Driven gear; 3. Inlet pipe; 31. Rotary joint; 32. Connecting pipe; 33. Ammonia pipe; 34. Outlet; 35. Denitrification pipe; 36. Filter screen; 37. Solenoid valve; 4. Ammonia detector; 5. Spiral blade. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Example 1: A denitrification device for solving the problem of high ammonia slip in flue gas from waste incineration plants, see [link to example]. Figures 1 to 3 The system includes a mixing mechanism, comprising a denitrification pipe fixedly connected between the upper and lower ends of the inner cavity of the denitrification tower, and denitrification particles for flue gas denitrification. The denitrification pipe is equipped with an ammonia pipe arranged in an S-shape. Multiple air outlets are equidistantly spaced on the inner side of the ammonia pipe. An air inlet pipe is connected to the middle of the top of the ammonia pipe, penetrating the denitrification tower. The connection between the air inlet pipe and the denitrification tower is achieved through a sealed bearing, allowing the air inlet pipe to rotate while simultaneously sealing with the denitrification tower. A flue gas inlet pipe is located on the lower side of one end of the denitrification tower. An exhaust pipe is provided on the upper side of the end of the denitrification tower away from the flue gas inlet pipe. The ends of the flue gas inlet pipe and the exhaust pipe near the denitrification tower both penetrate the denitrification tower and connect to the denitrification pipe, and both the flue gas inlet pipe and the exhaust pipe communicate with the inner cavity of the denitrification pipe. A drive mechanism is used to drive the rotation of the ammonia pipe. The drive mechanism includes a mounting bracket fixedly installed on the top of the denitrification tower. A drive motor is fixedly installed on the top inner side of the mounting bracket. A drive gear is installed on the drive end of the drive motor. A driven gear is fixedly installed on the outer side of the air inlet pipe above the denitrification tower 1. The drive gear meshes with the driven gear.

[0023] During operation, flue gas is introduced into the denitrification pipe through the flue gas inlet pipe. Denitrification particles are used to denitrify the flue gas. During flue gas denitrification, ammonia gas is introduced into the ammonia gas pipe through the inlet pipe. Then, the ammonia gas is sprayed into the denitrification pipe through the outlet. Since the outlet is evenly distributed on the ammonia gas pipe, ammonia gas is sprayed out into the denitrification pipe at equal intervals. At this time, the drive motor is started to drive the drive gear to rotate, which in turn drives the ammonia gas pipe to rotate. This makes the ammonia gas in the denitrification pipe evenly distributed at equal intervals, so that the NOx in the flue gas and the ammonia gas can fully contact and mix. This improves the mixing uniformity of ammonia gas and flue gas, and avoids uneven mixing of ammonia gas and flue gas, which can lead to local ammonia gas escape and increase, causing secondary pollution.

[0024] For details, see Figure 2 The top of the intake pipe is equipped with a rotary joint, and the top of the intake pipe is connected to the intake pipe through a sealed bearing, so that the intake pipe and the rotary joint are rotatably connected and sealed at the same time. The top of the rotary joint is connected to a connecting pipe. The rotary joint consists of a rotating ring (moving ring) and a stationary ring (stationary ring), which are pressed together by a spring to form a precision end face seal. The rotating ring (moving ring) and the stationary ring (stationary ring) realize fluid transmission. The rotary joint is a known technology and will not be described in detail here. With the setting of the rotary joint, when the ammonia pipe rotates, the connecting pipe does not rotate, so as to facilitate the introduction of ammonia into the rotating ammonia pipe through the connecting pipe.

[0025] Further, see Figure 1 The denitrification pipe is fixedly connected to a spiral blade. The ammonia pipe is placed in the middle of the spiral blade and does not contact the spiral blade. By setting the spiral blade, the flue gas spirals upward to denitrify, increasing the contact time between the flue gas and the denitrification particles, and further improving the denitrification effect of the flue gas.

[0026] It is worth noting that, see Figure 2 An ammonia detector is installed on the exhaust pipe. The detection head of the ammonia detector penetrates the exhaust pipe and is placed inside the exhaust pipe cavity. An electromagnetic valve is installed inside the connecting pipe. After the ammonia detector processes the signal through a control processor in the prior art, it is connected to the electromagnetic valve. The ammonia detector detects the ammonia content in the treated flue gas discharged from the exhaust pipe. When the ammonia content in the flue gas discharged from the exhaust pipe is higher than the normal ammonia escape content, the electromagnetic valve is controlled to reduce the flow rate of ammonia entering, so as to ensure that the ammonia is fully mixed with the NOx in the flue gas and reduce ammonia escape.

[0027] It is worth noting that, see Figure 3 A filter screen is fixedly installed inside the air outlet. The filter screen has a pore size smaller than that of the denitrification particles. By setting the filter screen, the denitrification particles can be prevented from clogging the air outlet and affecting the discharge of ammonia.

[0028] In addition, all components designed in this utility model are general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. Those skilled in the art can fully implement them, so there is no need to elaborate. The content protected by this utility model does not involve improvements to the internal structure and method.

[0029] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A denitrification device for solving the problem of high ammonia slip in flue gas from waste incineration plants, characterized in that, include: The mixing mechanism includes a denitrification pipe (35) fixedly connected between the upper and lower ends of the inner cavity of the denitrification tower (1) and denitrification particles for flue gas denitrification. The denitrification pipe (35) is provided with an ammonia pipe (33), which is S-shaped. Multiple air outlets (34) are equidistantly opened on the inner side of the ammonia pipe (33). An air inlet pipe (3) is connected to the middle of the top of the ammonia pipe (33). The air inlet pipe (3) penetrates the denitrification tower (1), and the connection between the air inlet pipe (3) and the denitrification tower (1) is connected by a sealed bearing, so that the air inlet pipe (3) is rotatably connected to the denitrification tower (1) while being sealed to the denitrification tower (1). A drive mechanism is used to drive the rotation of the ammonia pipe (33).

2. The denitrification equipment for solving the problem of high ammonia slip in flue gas from waste incineration plants as described in claim 1, characterized in that, The drive mechanism includes a mounting bracket (2) fixedly installed on the top of the denitrification tower (1). A drive motor (21) is fixedly installed on the top inner side of the mounting bracket (2). A drive gear (22) is installed on the drive end of the drive motor (21). A driven gear (23) is fixedly installed on the outer side of the air inlet pipe (3) above the denitrification tower (1). The drive gear (22) meshes with the driven gear (23).

3. The denitrification equipment for solving the problem of high ammonia slip in flue gas from waste incineration plants as described in claim 1, characterized in that, The top of the air intake pipe (3) is equipped with a rotary joint (31), and the top of the air intake pipe (3) is connected to the air intake pipe (3) through a sealed bearing, so that the air intake pipe (3) is rotatably connected to the rotary joint (31) while being sealed with the rotary joint (31). The top of the rotary joint (31) is connected to a connecting pipe (32).

4. The denitrification equipment for solving the problem of high ammonia slip in flue gas from waste incineration plants as described in claim 1, characterized in that, The denitrification tube (35) is fixedly connected to a spiral blade (5), and the ammonia tube (33) is placed in the middle of the spiral blade (5) and does not contact the spiral blade (5).

5. The denitrification equipment for solving the problem of high ammonia slip in flue gas from waste incineration plants as described in claim 1, characterized in that, A flue gas inlet pipe (11) is provided on the lower side of one end of the denitrification tower (1), and an exhaust pipe (12) is provided on the upper side of the end of the denitrification tower (1) away from the flue gas inlet pipe (11). The ends of the flue gas inlet pipe (11) and the exhaust pipe (12) near the denitrification tower (1) both penetrate the denitrification tower (1) and are connected to the denitrification pipe (35), and the flue gas inlet pipe (11) and the exhaust pipe (12) are both connected to the inner cavity of the denitrification pipe (35).

6. A denitrification device for solving the problem of high ammonia slip in flue gas from waste incineration plants as described in claim 3 or 5, characterized in that, An ammonia detector (4) is installed on the exhaust pipe (12). The detection head of the ammonia detector (4) passes through the exhaust pipe (12) and is placed inside the exhaust pipe (12). An electromagnetic valve (37) is installed inside the connecting pipe (32).

7. The denitrification equipment for solving the problem of high ammonia slip in flue gas from waste incineration plants as described in claim 1, characterized in that, A filter screen (36) is fixedly installed inside the air outlet (34), and the filter screen (36) has a filter hole size smaller than the size of the denitrification particles.

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