Denitration system reactor with sound wave soot blowing function
By setting up buffer plates and vibration plates in the denitrification system, we ensure that the sound wave soot blowing equipment does not disturb the flow field when the flue gas is circulated. Combined with compressed air to enhance the flue gas circulation and heater maintain the temperature, the impact of sound soot blowing equipment in traditional systems is solved. The problem of blockage of flue gas flow field and catalyst layer improves denitrification efficiency and equipment life.
Patent Information
- Application Number
- CN202420949652.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2034-04-30
AI Technical Summary
In traditional flue gas denitrification systems, sound wave soot blowing equipment can easily disrupt the flue gas flow field distribution when flue gas is continuously injected, resulting in a decrease in denitrification efficiency. The equipment needs to be started intermittently when the flue gas flow is stopped, which limits the system's long-term work. and soot blowing treatment efficiency.
A buffer plate is set between the catalyst layer and the shell, and an air outlet is set in the buffer plate to communicate with the expander. A vibrating plate is fixedly installed so that the sound waves directly act on the vibration plate, avoiding the sound waves propagating arbitrarily in the shell, and at the same time, through compressed air Enhance the flue gas flow rate and maintain the appropriate temperature of the heater to ensure the uniformity of the flue gas flow field and the normal operation of the catalyst layer.
It is realized that the sound wave soot blowing equipment is enabled when the flue gas is circulated without affecting the uniformity of the flue gas flow field, improve denitrification efficiency, extend the service life of the catalyst layer, reduce equipment costs, and slow down the occurrence of fly ash blockage problems.
Smart Images
Figure CN222219169U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue gas treatment equipment, in particular to a denitration system reactor with sonic soot blowing. Background Art
[0002] In traditional flue gas denitrification systems, the catalyst layer in the reactor is prone to fly ash clogging, which increases system resistance and has a huge impact on the denitrification efficiency. Therefore, it is necessary to install soot blowing equipment in the reactor to solve the fly ash clogging problem. For example, the prior art discloses a denitrification sonic soot blowing equipment system (application number: 201620262509.8), which arranges a plurality of sonic soot blowing unit layers in the denitrification SCR device, and each sonic soot blowing unit layer includes a plurality of array-arranged resonant cavity sonic soot blowers, which are used to generate sound waves to remove fly ash.
[0003] Specifically, the prior art discloses a sonic soot blowing unit layer structure, such as Figure 1 As shown, the amplifier 41 of the sonic soot blowing equipment is directly connected to the side wall of the shell 1 of the denitrification system reactor, and the compressed air energy is converted into sonic energy in the form of sound waves to act on the inner wall of the shell 1 or directly on the catalyst layer 2, so as to achieve the purpose of removing fly ash by generating reciprocating vibration. The propagation direction of the sound wave is basically parallel to the horizontal plane, which is very different from the movement direction of the flow field in the reactor shell 1 that is perpendicular to the horizontal plane (that is, the flow direction of the flue gas, represented by the vertical arrow from top to bottom). Therefore, if the sonic soot blowing equipment is turned on at the same time during the process of continuously introducing flue gas for catalytic denitrification, the uneven distribution of the flue gas flow field will not only reduce the catalytic denitrification efficiency, but also the soot blowing efficiency of the sonic soot blowing equipment will be reduced compared to the intermittent start-up of the sonic soot blowing equipment when the flue gas circulation is stopped, because the flow of flue gas also has a certain influence on the propagation of sound waves. Based on this, in order to avoid the influence of continuous sound waves on the uniformity of the flue gas flow field distribution, the existing sonic soot blowing equipment is generally started intermittently when the flue gas circulation is stopped. This also causes the denitrification system reactor to be unable to continue the denitrification work for a long time, reduces the soot blowing efficiency, and makes the efficiency of the flue gas treatment unable to be guaranteed; in addition, repeated opening and closing of the sonic soot blowing equipment can easily reduce the life of the sonic soot blowing equipment and increase the equipment cost. Utility Model Content
[0004] The utility model provides a denitration system reactor with sonic soot blowing, which can solve the technical problem that the existing sonic soot blowing equipment can only be started intermittently when the flue gas circulation is stopped, so that the working efficiency of the flue gas treatment cannot be guaranteed.
[0005] This application provides the following technical solutions:
[0006] A denitrification system reactor with sonic soot blowing comprises a flue gas duct, a shell, a catalyst layer fixedly installed in the shell, a rectifier, and also comprises a sonic soot blowing device and an air pipe, wherein the sonic soot blowing device comprises an expander connected by the air pipe, a compressed air storage tank, and a heater for preheating compressed air, wherein the compressed air storage tank is connected to the flue gas duct through the air pipe; a buffer plate is arranged between the catalyst layer and the shell, the buffer plate is fixedly installed on the inner wall of the shell, the catalyst layer and the rectifier are both fixedly installed on the inner wall of the buffer plate, an air outlet is arranged in the buffer plate and is connected to the expander, a vibration plate is fixedly arranged on the inner wall of the buffer plate near the air outlet, and the cross section of the vibration plate is larger than the cross section of the air outlet.
[0007] Beneficial effects:
[0008] 1. The fundamental reason why the activation of the sonic soot blowing equipment in the prior art easily disrupts the uniformity of the flue gas flow field distribution is that the propagation direction of the sound waves in the shell is irregular, which conflicts with the top-down flue gas flow direction. This solution arranges a buffer plate between the catalyst layer and the shell and arranges an air outlet in the buffer plate to connect with the expander, and at the same time, a vibration plate is fixed on the inner wall of the buffer plate near the air outlet, so that the sound waves generated by the sonic soot blowing equipment directly act on the vibration plate instead of the inner wall of the shell or the catalyst layer. Since the sound waves are not allowed to propagate arbitrarily in the shell, the uniformity of the flue gas flow field will not be affected. The sonic soot blowing equipment can be activated while the flue gas is circulating, which is beneficial to improving the denitrification efficiency.
[0009] 2. The cross-section of the vibration plate is larger than the cross-section of the air outlet, so that the vibration plate can completely cover the air outlet and the reserved excess area on the vibration plate beyond the air outlet can strengthen the fixed connection between the vibration plate and the buffer plate, which is beneficial to the generation of resonance on the buffer plate and the catalyst layer.
[0010] 3. In addition to providing energy for sonic ash removal, the compressed air storage tank can also be connected to the flue gas duct through an air pipe. The circulation speed of the flue gas can be enhanced by inputting compressed air into the flue gas duct. After the circulation speed of the flue gas increases, the residence time of fly ash on the catalyst layer is reduced, which can extend the time when the catalyst layer is blocked by fly ash. At the same time, after the heater is set to heat the compression, the temperature of the flue gas can be ensured not to be affected. Because too low flue gas temperature will have an adverse effect on the usage and service life of the catalyst layer, it is not conducive to the control of denitrification costs. At the same time, it can prevent water vapor in the flue gas from condensing on the catalyst layer when it encounters cold, which also has a positive effect on further reducing the probability of fly ash blockage on the catalyst layer.
[0011] Further, as an improvement, the diffuser includes a first diffuser located above the catalyst layer and a second diffuser located below the catalyst layer.
[0012] Beneficial effect: Providing two sets of expanders can speed up the dredging of fly ash in the catalyst layer.
[0013] Further, as an improvement, the heater includes a heating chamber arranged between the expander and the compressed air storage tank, and an electric heating wire arranged in the heating chamber, and the electric heating wire is electrically connected to a motor arranged outside the heating chamber.
[0014] Beneficial effect: When the heating wire is energized, electric heating is generated, which can heat the compressed air.
[0015] Further, as an improvement, the heater is a heat exchange pipe fixedly arranged on the outer wall of the compressed air storage tank.
[0016] Beneficial effect: By introducing hot water or hot steam into the heat exchange pipe, heat exchange is carried out with the compressed air in the compressed air storage tank to achieve the purpose of heating the compressed air.
[0017] Furthermore, as an improvement, the air pipe includes a main air pipe connected to a compressed air storage tank, a first air pipe branch connected to a first expander, a second air pipe branch connected to a second expander, a third air pipe branch and a fourth air pipe branch connected to the flue gas duct, and each air pipe branch is provided with a valve for individual control; the main air pipe is connected to the first air pipe branch, the second air pipe branch, the third air pipe branch, and the fourth air pipe branch.
[0018] Beneficial effects: The first air pipe branch, the second air pipe branch, the third air pipe branch and the fourth air pipe branch are all used to transport compressed air, and each air pipe branch is provided with a valve for separate control, which is convenient for technicians to adjust and control the delivery direction and delivery volume of compressed air at any time.
[0019] Further, as an improvement, the vibration plate is made of hard alloy.
[0020] Beneficial effects: Harder materials are more likely to vibrate when rubbed (i.e. when impacted by sound waves) because they can store more energy and release it quickly. Vibration plates made of cemented carbide are more conducive to solving fly ash blockage problems.
[0021] Further, as an improvement, the surface roughness of the vibration plate is Ra>8.
[0022] Beneficial effect: The rough surface of the vibration plate can increase the contact area with the sound waves, resulting in more small collisions and vibrations, which is more conducive to solving the fly ash blockage problem. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 It is a structural schematic diagram of the installation position of the amplifier in the prior art;
[0024] Figure 2 It is a perspective view of a first embodiment of a denitration system reactor with sonic soot blowing according to the utility model;
[0025] Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle;
[0026] Figure 4 for Figure 2 An enlarged schematic diagram of the valve assembly 51;
[0027] Figure 5 for Figure 2 BB cross-sectional view. DETAILED DESCRIPTION
[0028] The following is further described in detail through specific implementation methods:
[0029] The marks in the drawings of the specification include: shell 1, catalyst layer 2, rectifier 3, sonic soot blowing equipment 4, first expander 41, second expander 42, compressed air storage tank 43, heater 44, air pipe 5, valve group 51, solenoid valve 511, self-operated pressure regulating valve 512, ball valve 513, air pipe main line 52, first air pipe branch 53, second air pipe branch 54, third air pipe branch 55, fourth air pipe branch 56, flue gas duct 6, buffer plate 7, first air outlet 71, second air outlet 72, vibration plate 8.
[0030] Embodiment 1
[0031] Combination Figure 2-Figure 5 As shown, a denitration system reactor with sonic soot blowing includes a shell 1 and a honeycomb catalyst layer 2 and a grid rectifier 3 fixedly installed in the shell 1 , and also includes a sonic soot blowing device 4 and an air pipe 5 .
[0032] The top inlet of the shell 1 is connected to a flue gas duct 6 .
[0033] The sonic sootblowing equipment 4 includes an expander connected by an air pipe, a compressed air storage tank 43 and a heater 44 for preheating compressed air, the heater 44 includes a heating chamber and an electric heating wire arranged in the heating chamber, and the electric heating wire is electrically connected to a motor arranged outside the heating chamber; the expander and the heater 44 are connected by an air pipe 5, the air pipe 5 includes a main air pipe line 52, a first air pipe branch line 53, a second air pipe branch line 54, a third air pipe branch line 55, and a fourth air pipe branch line 56, and the main air pipe line 52 is connected to the first air pipe branch line 53, the second air pipe branch line 54, the third air pipe branch line 55, and the fourth air pipe branch line 56.
[0034] In this embodiment, the expander includes a first expander 41 and a second expander 42. The first expander 41 and the second expander 42 are respectively connected to a first air pipe branch 53 and a second air pipe branch 54. The first air pipe branch 53 and the second air pipe branch 54 are both provided with a valve group 51. Figure 4 As shown, the valve group 51 includes a solenoid valve 511, a self-operated pressure regulating valve 512, and a ball valve 513. A sound wave generator (not shown in the figure) for generating sound waves is arranged between the valve group 51 and the first expander 41 or the second expander 42; the third air pipe branch 55 and the fourth air pipe branch 56 are both connected to the flue gas duct 6.
[0035] A buffer plate 7 is arranged longitudinally along the inner wall of the shell 1 between the catalyst layer 2, the rectifier 3 and the shell 1. The buffer plate 7 is fixedly mounted on the inner wall of the shell 1 by screws. The catalyst layer 2 and the rectifier 3 are fixedly mounted on the inner wall of the buffer plate 7. The rectifier 3 is located on the upper part of the catalyst layer 2. The buffer plate 7 is provided with a first air port 71 and a second air port 72. The first air port 71 is located above the catalyst layer and is connected to the first expander 41. As a reference, in this embodiment, the first air port 71 is directly opposite to the rectifier 3; the second air port 72 is located below the catalyst layer 2 and is connected to the second expander 42. Figure 5 As shown, a vibration plate 8 is fixedly provided on the inner wall of the buffer plate 7 near the first air outlet 71 and the second air outlet 72. The cross-section of the vibration plate 8 is larger than the cross-section of the first air outlet 71 and the second air outlet 72 so as to completely cover the first air outlet 71 and the second air outlet 72. As a reference, the vibration plate 8 in this embodiment is made of cemented carbide and the surface roughness of the side close to the air outlet is Ra=25. The vibration plate 8 is used to withstand the compressed air from the expander and cause the catalyst layer 2 and the rectifier 3 to resonate.
[0036] In other embodiments, the number of catalyst layers 2 and the number of expanders can be set arbitrarily according to project requirements.
[0037] The specific application process is as follows:
[0038] During use, the flue gas is input into the shell 1 from the flue gas duct 6 and passes through the rectifier 3 and the catalyst layer 2 from top to bottom in sequence. Long-term use will cause fly ash blockage in the catalyst layer 2, and dust accumulation is also prone to appear on the surface of the rectifier 3. At this time, the valve group 51 and the sound wave generator can be controlled to open, and the compressed air in the compressed air storage tank is formed into a high-speed shock wave by the first air pipe branch 53 and the second air pipe branch 54 in combination with the sound wave. The high-speed shock wave acts on the vibration plate 8 under the guidance of the first air port 71 and the second air port 72. The vibration plate 8 at the first air port 71 vibrates and causes the rectifier 3 and the buffer plate 7 to resonate, and the dust accumulation on the rectifier 3 is cleared; and resonance is also generated between the catalyst layer 2 and the buffer plate 7, so that the fly ash that causes the blockage of the catalyst layer 2 is unblocked; further, the resonance caused by the vibration plate 8 at the second air port 72 can accelerate the unblocking of the fly ash in the catalyst layer 2, and the denitrification efficiency is further improved; since the present scheme does not allow the sound wave to propagate arbitrarily in the shell 1, it will not affect the uniformity of the flue gas flow field.
[0039] On the other hand, the third air pipe branch 55 and the fourth air pipe branch 56 are both connected to the flue gas duct 6 to enhance the circulation speed of the flue gas by inputting compressed air into the flue gas duct 6. After the circulation speed of the flue gas is increased, the residence time of the fly ash on the catalyst layer 2 is reduced, which can extend the time when the catalyst layer 2 is clogged by fly ash. It is worth mentioning that because too low flue gas temperature will have an adverse effect on the usage and service life of the catalyst layer 2, it is not conducive to the control of denitrification costs. The heater 44 is set in this scheme to heat the compressed air, which can ensure that the temperature of the flue gas is not affected. At the same time, it can prevent water vapor in the flue gas from condensing on the catalyst layer 2 when it encounters cold, which has a positive effect on further reducing the probability of fly ash clogging on the catalyst layer 2.
[0040] Embodiment 2
[0041] The difference between this embodiment and the first embodiment is that the heater 44 is a heat exchange pipe fixedly arranged on the outer wall of the compressed air storage tank 43, and heat is exchanged with the compressed air in the compressed air storage tank by passing hot water or hot steam into the heat exchange pipe to achieve the purpose of heating the compressed air.
[0042] Comparative Example 1
[0043] The difference between this comparative example and Example 1 is that Figure 2 and Figure 3The vibration plate 8 and the second air outlet 72 shown are arranged in alignment with the catalyst layer 2, so that the impact brought by the compressed air can directly act on the catalyst layer 2 through the vibration plate 8; however, in the prior art, the catalyst layer 2 is mostly a modular structure. For example, the honeycomb catalyst layer 2 used in Example 1 is composed of several honeycomb modules. If the impact force is directly applied to the catalyst layer 2, the honeycomb module is prone to loosening, which is not conducive to catalytic reforming of the flue gas to achieve the purpose of denitrification.
[0044] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.
Claims
1. A denitration system reactor with sonic soot blowing, comprising a flue gas duct, a shell, a catalyst layer fixedly installed in the shell, and a rectifier, characterized in that: It also includes an acoustic soot blowing device and an air pipe, wherein the acoustic soot blowing device includes an expander connected to the air pipe, a compressed air storage tank, and a heater for preheating compressed air, and the compressed air storage tank is connected to the flue gas pipeline through the air pipe; A buffer plate is arranged between the catalyst layer and the shell, and the buffer plate is fixedly mounted on the inner wall of the shell. The catalyst layer and the rectifier are fixedly mounted on the inner wall of the buffer plate. An air outlet is arranged in the buffer plate and is connected to the expander. A vibration plate is fixedly arranged on the inner wall of the buffer plate near the air outlet, and the cross-section of the vibration plate is larger than the cross-section of the air outlet.
2. A denitration system reactor with sonic soot blowing according to claim 1, characterized in that: The diffuser includes a first diffuser located above the catalyst layer and a second diffuser located below the catalyst layer.
3. A denitration system reactor with sonic soot blowing according to claim 2, characterized in that: The heater comprises a heating chamber arranged between the expander and the compressed air storage tank, and an electric heating wire arranged in the heating chamber, wherein the electric heating wire is electrically connected to a motor arranged outside the heating chamber.
4. A denitration system reactor with sonic soot blowing according to claim 2, characterized in that: The heater is a heat exchange pipe fixedly arranged on the outer wall of the compressed air storage tank.
5. A denitration system reactor with sonic soot blowing according to claim 3 or 4, characterized in that: The air pipe includes a main air pipe connected to a compressed air storage tank, a first air pipe branch connected to a first expander, a second air pipe branch connected to a second expander, and a third air pipe branch and a fourth air pipe branch connected to the flue gas duct. The main air pipe is connected to the first air pipe branch, the second air pipe branch, the third air pipe branch, and the fourth air pipe branch, and a valve is provided on each air pipe branch for individual control.
6. A denitration system reactor with sonic soot blowing according to claim 5, characterized in that: The vibration plate is made of hard alloy.
7. A denitration system reactor with sonic soot blowing according to claim 6, characterized in that: The surface roughness of the vibration plate is Ra>8.