Full load denitration device for deep peak regulation of boiler

Abstract

The utility model relates to a boiler denitration device technical field, and disclose a kind of for the full load denitration device of boiler depth peak shaving, including main flue, and the one side of main flue is provided with the mixing assembly for to flue gas conveying mixture, and mixing assembly includes the air inlet pipe and processing frame of being arranged in the one side of main flue, and the one end of main flue is provided with extension frame, and extension frame inside is provided with guide slot, and the one end of extension frame is provided with cavity, and the inside of cavity is provided with connecting shaft, and the outside of connecting shaft is provided with fan leaf;Cavity inner wall is provided with temperature sensor, and the outside of main flue is provided with bypass pipe, and the inside of bypass pipe is provided with control valve.The utility model is mixed by being contacted fully to high-temperature flue gas and low-temperature flue gas, so that the temperature in flue gas is evenly distributed, improve the consistency of flue gas temperature, ensure catalyst use effect, and it is convenient to detect flue gas temperature and adjust high-temperature flue gas and low-temperature flue gas proportion to make it adapt to catalyst action temperature.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler denitrification devices, specifically a full-load denitrification device for deep peak shaving of boilers. Background Technology

[0002] Deep peak shaving of boilers refers to the process where, when grid demand is low, generator units reduce their load to a lower level than their rated load through precise load regulation and combustion control to meet the grid's peak shaving needs while ensuring safe and stable operation. However, this causes a drop in boiler temperature. At low load operation, the low temperature reduces or even completely deactivates the catalyst in the denitrification unit, leading to increased nitrogen oxide emissions and environmental pollution. Full-load denitrification systems utilize various technologies to ensure effective removal of nitrogen oxides from the boiler under full load conditions, meeting environmental protection requirements, reducing pollution, improving unit operational flexibility, and lowering operating costs.

[0003] However, when using a bypass flue to inject high-temperature flue gas into the denitrification device, the high-temperature flue gas may not mix sufficiently with the low-temperature flue gas in the main flue, resulting in uneven temperature distribution of the flue gas entering the denitrification device. This may cause the catalyst to encounter excessively high or low temperatures, affecting the catalyst's activity and lifespan, and reducing the denitrification effect. Utility Model Content

[0004] The purpose of this invention is to provide a full-load denitrification device for deep peak shaving of boilers, in order to solve the problem mentioned in the background art that when using bypass flue gas to inject high-temperature flue gas into the denitrification device to ensure the stability of the catalyst effect, if the high-temperature flue gas and low-temperature flue gas cannot be fully mixed or uneven temperature distribution occurs, it will affect the activity and service life of the catalyst and reduce the denitrification effect.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a full-load denitrification device for deep peak shaving of boilers, including a main flue, a mixing component for conveying and mixing flue gas is provided on one side of the main flue, the mixing component includes an air inlet pipe and a processing frame provided on one side of the main flue, an extension frame is provided at one end of the main flue, a guide groove is provided inside the extension frame, a cavity is provided at one end of the extension frame, a connecting shaft is provided inside the cavity, and fan blades are provided outside the connecting shaft;

[0006] A temperature sensor is installed on the inner wall of the cavity, a bypass pipe is installed outside the main flue, and a control valve is installed inside the bypass pipe.

[0007] Preferably, one end of the air intake pipe is connected to the processing frame, and both ends of the extension frame are connected to and communicate with the air intake pipe and the main flue, respectively.

[0008] Preferably, the guide groove is located within the extension frame, and the guide groove is divided into two lines, which intersect at an arc angle, so that the flue gas is transported along two separate routes and comes into contact with each other multiple times during the transport process.

[0009] Preferably, the cavity is located inside the extension frame near the processing frame and communicates with the guide groove. The connecting shaft is located inside the cavity and is rotatably connected to the inner wall of the cavity. The fan blade is sleeved outside the connecting shaft and is coaxially connected to the connecting shaft.

[0010] Preferably, one end of the guide groove is inclined and communicates with the inside of the cavity. The flue gas that enters at an inclined angle comes into contact with the fan blades and drives the fan blades to rotate in the cavity, so that the flue gas is spirally transported in the cavity.

[0011] Preferably, the temperature sensor is located inside the cavity and is connected to the inner wall of the cavity by bolts. The temperature sensor is also electrically connected to the control valve. One end of the bypass pipe is connected to and communicates with the main flue, and the other end is connected to the economizer inlet.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. By setting up a treatment frame in the area between the main flue and the inlet pipe of the denitrification device, and connecting the bypass pipe to the main flue, high-temperature flue gas and low-temperature flue gas enter the extension frame together and are transported in the guide groove within the extension frame. The two through grooves of the guide groove can naturally divide the flue gas into two streams. At the same time, the two through grooves of the guide groove are intersected by an arc structure, causing the two streams of flue gas to collide and mix at the intersection. Through multiple mixing, the mixing effect of high-temperature flue gas and low-temperature flue gas is improved. After entering the cavity, the flue gas spirals through the fan blades to further improve the mixing effect, thereby avoiding temperature differences in the flue gas and ensuring the uniformity of flue gas temperature distribution.

[0014] 2. By installing a control valve in the area of ​​the bypass pipe near the main flue, the proportion of high-temperature flue gas injected into the bypass pipe can be controlled. At the same time, a temperature sensor installed in the extension frame can detect the temperature of the mixed flue gas. The detected temperature is connected to the control valve to facilitate the adjustment of the ratio of high-temperature flue gas and low-temperature flue gas, so that the mixed flue gas can adapt to the working temperature of the catalyst and ensure the denitrification effect.

[0015] This invention achieves uniform temperature distribution in flue gas by fully contacting and mixing high-temperature and low-temperature flue gas, thus improving the consistency of flue gas temperature, ensuring the effectiveness of the catalyst, and facilitating the detection and adjustment of the flue gas temperature ratio to suit the catalyst's operating temperature. Attached Figure Description

[0016] Figure 1 This is an overall isometric view of the present invention;

[0017] Figure 2 This is a cross-sectional view of the extension frame of this utility model;

[0018] Figure 3 This is an enlarged view of part A of the present invention;

[0019] Figure 4 This is a structural diagram of the bypass pipe of this utility model.

[0020] In the diagram: 1. Main flue; 2. Processing frame; 201. Inlet pipe; 3. Extension frame; 301. Guide groove; 4. Cavity; 401. Connecting shaft; 402. Fan blade; 5. Temperature sensor; 6. Bypass pipe; 7. Control valve. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] All devices in this application adopt conventional models in the prior art, and the control method is through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art, which is common knowledge in the field, so this application will not explain it in detail.

[0023] Please see Figures 1-3 A full-load denitrification device for deep peak shaving of boilers includes a main flue 1. A mixing component for conveying and mixing flue gas is provided on one side of the main flue 1. The mixing component includes an inlet pipe 201 and a treatment frame 2 provided on one side of the main flue 1. A guide plate and a catalyst are provided inside the treatment frame 2, which can perform denitrification treatment after the flue gas enters the treatment frame 2. An extension frame 3 is provided at one end of the main flue 1, which connects the area between the inlet pipe 201 of the main flue 1 and the extension frame 3 to facilitate the conveying of flue gas. A guide groove 301 is provided inside the extension frame 3 to facilitate the mixing and conveying. A cavity 4 is provided at one end of the extension frame 3 to temporarily store the mixed flue gas. A connecting shaft 401 is provided inside the cavity 4 to facilitate the rotation of the fan blade 402. The fan blade 402 is provided outside the connecting shaft 401. The end of the guide groove 301 near the cavity 4 is inclined so that the flue gas enters the cavity 4 at an inclined angle.

[0024] One end of the intake pipe 201 is connected to the processing frame 2. The two ends of the extension frame 3 are connected to and communicate with the intake pipe 201 and the main flue 1, respectively. The guide groove 301 is located inside the extension frame 3 and is divided into two lines. The two lines intersect at an arc angle, so that the flue gas is transported in two separate routes and makes multiple contacts during the transport process. The cavity 4 is located inside the extension frame 3 near the processing frame 2 and communicates with the guide groove 301. The connecting shaft 401 is located inside the cavity 4 and is rotatably connected to the inner wall of the cavity 4. The fan blade 402 is sleeved on the outside of the connecting shaft 401 and is coaxially connected with the connecting shaft 401. One end of the guide groove 301 communicates with the inside of the cavity 4 at an inclined angle. The flue gas that enters at an inclined angle contacts the fan blade 402 and drives the fan blade 402 to rotate in the cavity 4, so that the flue gas is spirally transported in the cavity 4.

[0025] Specifically: During use, the high-temperature flue gas and low-temperature flue gas in the bypass pipe 6 and the main flue 1 converge at one end of the main flue 1 and enter the extension frame 3 together. They are guided and transported through the guide groove 301 in the extension frame 3. The mixed flue gas is divided into two streams by two through grooves in the guide groove 301. The arc angle in the through groove causes the two flue gas streams to collide at the intersection of the through grooves, which improves the mixing effect of the high-temperature flue gas and the low-temperature flue gas. The flue gas is injected into the cavity 4 through the guide groove 301 and enters the treatment frame 2 through the air inlet pipe 201 for denitrification treatment. The flue gas mixing improves the uniformity of the flue gas temperature distribution, so that the temperature of the flue gas entering the treatment frame 2 remains stable, ensuring the use of the catalyst.

[0026] Please see Figure 1 and Figure 4 A temperature sensor 5 is installed on the inner wall of cavity 4 to detect the temperature of the mixed flue gas inside cavity 4. A bypass pipe 6 is installed outside the main flue 1, which can be connected to the economizer inlet to transport high-temperature flue gas. A control valve 7 is installed inside the bypass pipe 6, which can control the proportion of high-temperature flue gas transported.

[0027] Temperature sensor 5 is located inside cavity 4 and is connected to the inner wall of cavity 4 by bolts. Temperature sensor 5 is also electrically connected to control valve 7. One end of bypass pipe 6 is connected to main flue 1 and communicates with it, while the other end is connected to the economizer inlet.

[0028] Specifically: When high-temperature flue gas and low-temperature flue gas mix and enter the cavity 4, the temperature of the mixed flue gas is detected by the temperature sensor 5, and the control valve 7 is controlled by the flue gas temperature to adjust the opening and closing amplitude, thereby adjusting the proportion of high-temperature flue gas entering the main flue duct 1, thereby adjusting the ratio of high-temperature flue gas and low-temperature flue gas and thus adjusting the temperature of the mixed flue gas, so that the temperature can adapt to the operating temperature of the catalyst.

[0029] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0030] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A full-load denitrification device for deep peak shaving of boilers, comprising a main flue (1), wherein a mixing component for conveying and mixing flue gas is provided on one side of the main flue (1), characterized in that: The mixing component includes an air inlet pipe (201) and a processing frame (2) disposed on one side of the main flue (1). An extension frame (3) is provided at one end of the main flue (1). A guide groove (301) is provided inside the extension frame (3). A cavity (4) is provided at one end of the extension frame (3). A connecting shaft (401) is provided inside the cavity (4). A fan blade (402) is provided outside the connecting shaft (401). A temperature sensor (5) is provided on the inner wall of the cavity (4), a bypass pipe (6) is provided on the outside of the main flue (1), and a control valve (7) is provided inside the bypass pipe (6).

2. The full-load denitrification device for deep peak shaving of boilers according to claim 1, characterized in that: One end of the air inlet pipe (201) is connected to the processing frame (2), and both ends of the extension frame (3) are connected to and communicate with the air inlet pipe (201) and the main flue (1) respectively.

3. A full-load denitrification device for deep peak shaving of boilers according to claim 2, characterized in that: The guide groove (301) is located inside the extension frame (3), and the guide groove (301) is divided into two lines, which intersect at an arc angle, so that the flue gas is transported in two separate routes and comes into contact multiple times during the transport process.

4. The full-load denitrification device for deep peak shaving of boilers according to claim 1, characterized in that: The cavity (4) is located inside the extension frame (3) near the processing frame (2) and communicates with the guide groove (301). The connecting shaft (401) is located inside the cavity (4) and is rotatably connected to the inner wall of the cavity (4). The fan blade (402) is sleeved on the outside of the connecting shaft (401) and is coaxially connected to the connecting shaft (401).

5. A full-load denitrification device for deep peak shaving of boilers according to claim 4, characterized in that: One end of the guide groove (301) is connected to the inside of the cavity (4) at an inclined angle. The flue gas that enters at an inclined angle comes into contact with the fan blade (402) and drives the fan blade (402) to rotate in the cavity (4), so that the flue gas is spirally transported in the cavity (4).

6. A full-load denitrification device for deep peak shaving of boilers according to claim 1, characterized in that: The temperature sensor (5) is located inside the cavity (4) and is connected to the inner wall of the cavity (4) by bolts. The temperature sensor (5) is electrically connected to the control valve (7). One end of the bypass pipe (6) is connected to the main flue (1) and communicates with it. The other end is connected to the economizer inlet.

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