Accurate ammonia spraying device for denitration system

Abstract

The utility model discloses an accurate ammonia spraying device for a denitration system, which relates to the technical field of denitration and comprises a denitration tank and an upper cover, an ammonia spraying box is arranged at the center of the upper cover, the lower end of the ammonia spraying box is connected with a vertically downward ammonia adding cylinder, and the ammonia adding cylinder extends downwards into the denitration tank and coincides with the central axis of the denitration tank. A mounting circular truncated cone device is fixedly connected to the lower end of the ammonification cylinder, a stirring device is rotatably connected to the mounting circular truncated cone device, a vertically-arranged adjusting device is slidably connected to the mounting circular truncated cone device, the adjusting device comprises a first piston column and a second piston column, and the first piston column and the second piston column are connected through a connecting plate; waste gas adding devices are arranged on the two sides of the ammonia spraying box, each waste gas adding device comprises an air pump, the lower end of each air pump is connected with a vertically-downward ventilation cylinder, and the ammonia adding cylinders and the ventilation cylinders are in sliding sealing connection with a first piston column and a second piston column correspondingly. The denitration efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of denitrification technology, specifically relating to a precision ammonia injection device for a denitrification system. Background Technology

[0002] The main principle of selective catalytic reduction (SCR) denitrification technology is that, under the action of a catalyst, the reducing agent (usually a mixture of ammonia and air) is fully mixed and reacted with the nitrogen oxides in the waste gas to generate nitrogen and water, thereby achieving the purpose of denitrification. It has the characteristics of high denitrification efficiency, no secondary pollution, and mature technology, and is widely used in large coal-fired power units.

[0003] Patent application CN202122507563.8 discloses a precision ammonia injection device for a denitrification system in a thermal power plant, including a conduit, a valve, and an adjusting device. The valve is fixedly connected to the surface of the conduit, and an ammonia injection grid is fixedly connected to the side of the valve away from the conduit. The adjusting device is disposed on the surface of the ammonia injection grid and includes a mounting frame fixedly connected to the surface of the ammonia injection grid. A drive motor is fixedly connected to the inner wall of the mounting frame. A support frame is fixedly connected to the surface of the ammonia injection grid, and a guide rail is slidably connected to the surface of the ammonia injection grid. A rack is fixedly connected to the surface of the guide rail, and a stop block is fixedly slidably connected to the inner wall of the guide rail. A limit spring is fixedly connected to the surface of the stop block, and a guide rope is fixedly connected to the surface of the stop block. By setting up an adjusting device, the operability of the equipment is improved, the ammonia dosage is easily adjusted, and the accuracy of the equipment is improved. However, this device cannot adjust the ammonia injection dosage in real time according to the flow rate of the exhaust gas, resulting in a certain lag in ammonia adjustment, which affects the denitrification efficiency. Furthermore, the lack of a stirring device means that the ammonia and exhaust gas cannot be fully mixed, affecting the denitrification effect. Utility Model Content

[0004] To address the problems mentioned in the background, this invention provides a precision ammonia injection device for a denitrification system, which can adjust the injection dosage of ammonia in real time, improve the accuracy of ammonia injection, and increase denitrification efficiency.

[0005] To achieve the above objectives, the specific technical solution of this utility model is as follows:

[0006] A precision ammonia injection device for a denitrification system includes a denitrification tank and a top cover. An ammonia injection box is located at the center of the top cover. A vertically downward-facing ammonia injection cylinder is connected to the lower end of the ammonia injection box. The ammonia injection cylinder extends downward into the denitrification tank and coincides with the central axis of the tank. A mounting truncated cone is fixedly connected to the lower end of the ammonia injection cylinder. An agitator is rotatably connected to the mounting truncated cone. A vertically positioned adjusting device is slidably connected to the mounting truncated cone. The adjusting device includes a first piston column and a second piston column, which are connected by a connecting plate. Waste gas adding devices are located on both sides of the ammonia injection tank. Each waste gas adding device includes an air pump, the lower end of which is connected to a vertically downward-facing venting cylinder. The ammonia injection cylinder and the venting cylinder are slidably and sealingly connected to the first and second piston columns, respectively.

[0007] As a further feature of the above scheme, the air pump is provided with an air inlet pipe, the air cylinder has a first through hole that is evenly distributed, and the ammonia charging cylinder has a second through hole that is evenly distributed.

[0008] As a further provision of the above solution, the mounting frustum device includes a mounting frustum with a vertically penetrating first mounting hole at its center. A coaxial receiving groove is formed at the upper end of the first mounting hole, and the receiving groove is connected to the ammonia charging cylinder. Vertically penetrating second mounting holes are formed on both sides of the first mounting hole, and the second mounting holes are coaxial with the venting cylinder. A drive motor device is provided on the outer side of the second mounting holes. The drive motor device includes a mounting bracket, which is fixedly mounted on the lower end face of the mounting frustum. A drive motor is mounted on the mounting bracket, and a drive gear is connected to the drive motor.

[0009] As a further provision of the above scheme, the lower end of the first piston rod is connected to a first guide rod, and a spring device is sleeved on the first guide rod. The spring device is located in the receiving circular groove. The lower end of the first guide rod is fixedly connected to the center of the connecting plate. The first guide rod is slidably connected to the first mounting hole. The lower end of the second piston rod is provided with a second guide rod. The second guide rod is fixedly connected to both ends of the connecting plate. The second guide rod is slidably connected to the second mounting hole. The connecting plate is located below the mounting frustum.

[0010] As a further provision of the above scheme, the agitation device includes a concentric inner ring plate and an outer ring plate. The inner wall of the inner ring plate is rotatably connected to the mounting frustum, and the outer wall of the outer ring plate is rotatably connected to the inner wall of the denitrification tank. The inner ring plate and the outer ring plate are fixedly connected by circumferentially distributed spokes. Vertically upward disturbance columns are provided on the spokes. An internal gear ring is connected to the inner wall of the inner ring plate, and the internal gear ring meshes with a drive gear.

[0011] This utility model has the following beneficial effects:

[0012] Under the action of the spring device, the first and second piston columns move upward within the ammonia charging cylinder and the venting cylinder, sealing the first and second through holes at the top. When the air pump adds waste gas into the denitrification tank through the first through hole on the venting cylinder, the waste gas exerts a downward thrust on the second piston column, causing it to slide downward. The first through hole at the top of the venting cylinder gradually opens. As the second piston column slides downward, it drives the first piston column to move downward synchronously via the connecting plate, simultaneously opening the second through hole at the top of the ammonia charging cylinder. The ammonia injection dosage is adjusted and increased synchronously, allowing for real-time adjustment of the ammonia injection dosage and improving the accuracy of ammonia injection. Combined with the stirring device, the waste gas and ammonia are thoroughly mixed, greatly improving the denitrification efficiency. Attached Figure Description

[0013] Figure 1 This is a first cross-sectional schematic diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the second cross section of this utility model;

[0015] Figure 3 This is a schematic diagram of the adjustment device of this utility model;

[0016] Figure 4 This is a schematic diagram of the stirring device of this utility model;

[0017] Figure 5 This is a cross-sectional schematic diagram of the stirring device of this utility model.

[0018] 1. Denitrification tank; 2. Top cover; 3. Ammonia injection box; 4. Waste gas addition device; 5. Ventilation cylinder; 6. Ammonia charging cylinder; 7. Mounting frustum device; 8. Adjustment device; 9. Stirring device; 401. Air pump; 402. Air inlet pipe; 501. First through hole; 601. Second through hole; 701. Mounting frustum; 702. First mounting hole; 7021. Receiving groove; 703. Second mounting hole; 704. Drive motor device; 7041. Mounting bracket; 7042. Drive motor; 7043. Drive gear; 801. First piston rod; 8011. First guide rod; 8012. Spring device; 802. Second piston rod; 8021. Second guide rod; 803. Connecting plate; 901. Inner ring plate; 9011. Internal gear ring; 902. Outer ring plate; 903. Spoke plate; 904. Disturbance column. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The following will refer to the appendix... Figures 1-5 This application will be described in detail with reference to the embodiments.

[0021] like Figure 1 As shown, a precision ammonia injection device for a denitrification system includes a denitrification tank 1 and a top cover 2. An ammonia injection box 3 is located at the center of the top cover 2. The lower end of the ammonia injection box 3 is connected to a vertically downward ammonia injection cylinder 6. The ammonia injection cylinder 6 extends downward into the denitrification tank 1 and coincides with the central axis of the denitrification tank 1. A mounting frustum device 7 is fixedly connected to the lower end of the ammonia injection cylinder 6. An agitator 9 is rotatably connected to the mounting frustum device 7. A vertically arranged adjusting device 8 is slidably connected to the mounting frustum device 7. The adjusting device 8 includes a first piston column 801 and a second piston column 802. The first piston column 801 and the second piston column 802 are connected by a connecting plate 803. Waste gas injection devices 4 are provided on both sides of the ammonia injection box 3. The waste gas injection devices 4 include an air pump 401. The lower end of the air pump 401 is connected to a vertically downward venting cylinder 5. The ammonia injection cylinder 6 and the venting cylinder 5 are slidably and sealingly connected to the first piston column 801 and the second piston column 802, respectively.

[0022] like Figure 2 As shown, the air pump 401 is equipped with an air inlet pipe 402, the air cylinder 5 has evenly distributed first through holes 501, the ammonia charging cylinder 6 has evenly distributed second through holes 601, and the mounting frustum device 7 includes a mounting frustum 701. A vertically penetrating first mounting hole 702 is opened at the center of the mounting frustum 701. A coaxial receiving groove 7021 is opened at the upper end of the first mounting hole 702, and the receiving groove 7021 is connected to the ammonia charging cylinder 6. Vertically penetrating second mounting holes 703 are opened on both sides of the first mounting hole 702. The second mounting holes 703 are coaxial with the air cylinder 5. A drive motor device 704 is provided on the outside of the second mounting holes 703. The drive motor device 704 includes a mounting bracket 7041, which is fixedly installed on the lower end face of the mounting frustum 701. A drive motor 7042 is provided on the mounting bracket 7041, and a drive gear 7043 is connected to the drive motor 7042.

[0023] like Figure 3As shown, the lower end of the first piston rod 801 is connected to a first guide rod 8011, and a spring device 8012 is sleeved on the first guide rod 8011. The spring device 8012 is located in the receiving circular groove 7021. The lower end of the first guide rod 801 is fixedly connected to the center of the connecting plate 803. The first guide rod 8011 is slidably connected to the first mounting hole 702. The lower end of the second piston rod 802 is provided with a second guide rod 8011. The second guide rod 8021 is fixedly connected to both ends of the connecting plate 803. The second guide rod 8021 is slidably connected to the second mounting hole 703. The connecting plate 803 is located below the mounting frustum 701.

[0024] like Figure 4 , Figure 5 As shown, the agitation device 9 includes a concentric inner ring plate 901 and an outer ring plate 902. The inner wall of the inner ring plate 901 is rotatably connected to the mounting frustum 701, and the outer wall of the outer ring plate 902 is rotatably connected to the inner wall of the denitrification tank 1. The inner ring plate 901 and the outer ring plate 902 are fixedly connected by circumferentially distributed spokes 903. Vertically upward disturbance columns 904 are provided on the spokes 903. An internal gear ring 9011 is connected to the inner wall of the inner ring plate 901, and the internal gear ring 9011 meshes with the driving gear 7043.

[0025] The working process of this utility model is as follows: exhaust gas is introduced to the air pump 401 through the air inlet pipe 402. The air pump 401 adds exhaust gas to the denitrification tank 1 through the first through hole 501 on the air cylinder 5. The exhaust gas flow rates in the two air cylinders 5 are the same. The exhaust gas exerts a downward thrust on the second piston column 802. The second piston column 802 slides downward, and the first through hole 501 at the upper end of the air cylinder 5 is gradually unsealed. When the second piston column 802 slides downward, the first piston column 801 moves downward synchronously through the connecting plate 803. The second through hole 601 at the upper end of the ammonia charging cylinder 6 is unsealed synchronously. The ammonia injection dosage is adjusted and increased synchronously with the increase of the exhaust gas flow rate. The ammonia injection dosage is adjusted in real time to improve the accuracy of ammonia injection. The drive motor 7042 drives the internal gear ring 9011 to rotate through the drive gear 7043. The internal gear ring 9011 drives the inner ring plate 901 to rotate, thereby driving the disturbance column 904 to rotate in the denitrification tank 1, disturbing the exhaust gas and ammonia to mix thoroughly.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model 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 basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. 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 precision ammonia injection device for a denitrification system, comprising a denitrification tank and a top cover, wherein an ammonia injection box is disposed at the center of the top cover, characterized in that, The lower end of the ammonia injection tank is connected to a vertically downward-pointing ammonia charging cylinder, which extends downward into the denitrification tank and coincides with the central axis of the denitrification tank. The lower end of the ammonia charging cylinder is fixedly connected to a mounting frustum device, on which a stirring device is rotatably connected. A vertically arranged adjusting device is slidably connected to the mounting frustum device. The adjusting device includes a first piston column and a second piston column, which are connected by a connecting plate. Waste gas adding devices are provided on both sides of the ammonia injection tank. The waste gas adding device includes an air pump, the lower end of which is connected to a vertically downward-pointing venting cylinder. The ammonia charging cylinder and the venting cylinder are slidably and sealingly connected to the first piston column and the second piston column, respectively.

2. The precision ammonia injection device for a denitrification system according to claim 1, characterized in that, The air pump is equipped with an air inlet pipe, the air cylinder has a first through hole that is evenly distributed, and the ammonia charging cylinder has a second through hole that is evenly distributed.

3. The precision ammonia injection device for a denitrification system according to claim 2, characterized in that, The mounting frustum device includes a mounting frustum with a vertically penetrating first mounting hole at its center. A coaxial receiving groove is formed at the upper end of the first mounting hole, and the receiving groove is connected to the ammonia charging cylinder. Vertically penetrating second mounting holes are formed on both sides of the first mounting hole, and the second mounting holes are coaxial with the venting cylinder. A drive motor device is provided on the outer side of the second mounting holes. The drive motor device includes a mounting bracket, which is fixedly mounted on the lower end face of the mounting frustum. A drive motor is mounted on the mounting bracket, and a drive gear is connected to the drive motor.

4. The precision ammonia injection device for a denitrification system according to claim 3, characterized in that, The lower end of the first piston rod is connected to a first guide rod, and a spring device is sleeved on the first guide rod. The spring device is located in the receiving circular groove. The lower end of the first guide rod is fixedly connected to the center of the connecting plate. The first guide rod is slidably connected to the first mounting hole. The lower end of the second piston rod is provided with a second guide rod. The second guide rod is fixedly connected to both ends of the connecting plate. The second guide rod is slidably connected to the second mounting hole. The connecting plate is located below the mounting frustum.

5. The precision ammonia injection device for a denitrification system according to claim 1, characterized in that, The agitation device includes a concentric inner ring plate and an outer ring plate. The inner wall of the inner ring plate is rotatably connected to the mounting frustum, and the outer wall of the outer ring plate is rotatably connected to the inner wall of the denitrification tank. The inner and outer ring plates are fixedly connected by circumferentially distributed spokes. Vertically upward disturbance columns are provided on the spokes. An internal gear ring is connected to the inner wall of the inner ring plate, and the internal gear ring meshes with a drive gear.

Images