Flue gas denitration device for power plant

Abstract

The utility model provides a power plant flue gas denitrification device, which relates to the technical field of flue gas denitrification, and comprises a main channel and an ammonia water tank, a rotating shaft is rotatably mounted in the main channel, a baffle is fixedly mounted on one side of the outer surface of the rotating shaft, an auxiliary channel is fixedly mounted on one side of the outer surface of the main channel, and a connecting plate is fixedly mounted at one end of the outer surface of the rotating shaft; a fixing rod is fixedly installed on one side of the outer surface of the main channel, a hydraulic lifting rod is rotatably installed at one end of the fixing rod, the other end of the hydraulic lifting rod is rotatably installed at one end of a connecting plate, and an air inlet is fixedly formed in the upper side of the main channel. The baffle is driven to rotate in the main channel through pulling of the hydraulic lifting rod, so that the baffle is attached to the inner wall of the main channel, smoke entering the interior of the air inlet is guided by the auxiliary channel to enter the oxidation reaction device, temporary reaction is completed, continuous operation of the system can be guaranteed, and loss caused by unplanned shutdown is avoided.

Description

Technical Field

[0001] This utility model relates to the field of flue gas denitrification technology, and in particular to a flue gas denitrification device for power plants. Background Technology

[0002] Thermal power plants generally use fossil fuels to generate electricity, and the exhaust gas contains a large amount of harmful gases that are directly emitted and cause great harm to the environment. Nitrogen oxides are the basis for the formation of nitric acid rain and are highly toxic, so they need to be denitrified before they can be discharged.

[0003] A search revealed that Chinese Patent No. CN217795446U discloses a flue gas denitrification device for thermal power plants, comprising a mixing tank, an insulation sleeve, a stirring mechanism, a second heating mechanism, a spraying mechanism, and a flue. The mixing tank includes a tank body with supporting legs at the lower end and a lid at the upper end. The insulation sleeve includes a sleeve connected to the tank body, with heating tubes evenly spaced inside the sleeve. The stirring mechanism includes a motor connected to the tank body, with a stirring shaft connected to the lower end of the motor. Mixing plates are evenly spaced on the outer side of the stirring shaft, and stirring plates are evenly spaced on the outer side of each mixing plate. Stirring rods are evenly spaced at both ends of each stirring plate. This utility model has a reasonable structural design and strong practicality, facilitating effective heating, mixing, and stirring of urea water, improving its mixing efficiency, and facilitating continuous heating and delivery of ammonia gas, thus effectively improving the efficiency of ammonia denitrification.

[0004] Existing denitrification units generally adopt a single reactor structure design during operation. When the catalyst inside the unit loses activity due to sulfur poisoning, ash accumulation, or mechanical wear, or when periodic maintenance is required, such as replacing catalyst modules or cleaning and maintenance, the entire system must be shut down. This passive operation and maintenance mode not only causes production efficiency loss, but may also trigger the risk of exceeding environmental emission standards due to unplanned shutdowns. To address this problem, continuous denitrification can be ensured by adding a dual flue emergency bypass system. Utility Model Content

[0005] The purpose of this invention is to provide a power plant flue gas denitrification device that can solve the problems mentioned in the background.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a power plant flue gas denitrification device, comprising: a main channel and an ammonia tank, wherein a rotating shaft is rotatably installed inside the main channel, a baffle is fixedly installed on one side of the outer surface of the rotating shaft, a secondary channel is fixedly installed on one side of the outer surface of the main channel, a connecting plate is fixedly installed at one end of the outer surface of the rotating shaft, a fixing rod is fixedly installed on one side of the outer surface of the main channel, a hydraulic lifting rod is rotatably installed at one end of the fixing rod, the other end of the hydraulic lifting rod is rotatably installed at one end of the connecting plate, and an air inlet is fixedly installed on the upper side of the main channel.

[0007] In a preferred embodiment, an oxidation reaction device is fixedly installed at the other end of the secondary channel.

[0008] The technical advantage of adopting the above-mentioned further solution is that by setting up an oxidation reaction device, a temporary reaction can be achieved when the main unit is shut down for maintenance, thus avoiding losses caused by shutdown.

[0009] In a preferred embodiment, a preheating channel is fixedly connected to the lower side of the outer surface of the main channel, and two connection ports are fixedly installed on one side of the outer surface of the preheating channel.

[0010] The technical effect of adopting the above-mentioned further solution is that the flue gas can be preheated through the preheating channel.

[0011] In a preferred embodiment, a reaction vessel is fixedly installed at the other end of the two connection ports, an outlet is fixedly installed at the other end of the reaction vessel, and a set of guide plates is fixedly installed inside the reaction vessel.

[0012] The technical effect of adopting the above-mentioned further solution is that by setting up a guide plate, the flue gas entering the reaction vessel can move more evenly.

[0013] In a preferred embodiment, the output end of the ammonia tank is fixedly connected to a conduit, the other end of the conduit is fixedly installed inside the reaction vessel, and multiple nozzles are fixedly installed on the outside of the conduit.

[0014] The technical effect of adopting the above-mentioned further solution is that by setting multiple sets of nozzles, the flue gas and ammonia water can be fully mixed.

[0015] In a preferred embodiment, two mixers are fixedly installed inside the reaction vessel, and both mixers are located above the nozzle.

[0016] The technical effect of adopting the above-mentioned further solution is that by setting up two mixers, ammonia water and ammonia gas can be completely mixed and reacted.

[0017] In a preferred embodiment, a rectifier heater is fixedly installed inside the other side of the reaction vessel.

[0018] The technical effect of adopting the above-mentioned further solution is that the flue gas can be heated to the specified reaction temperature by using a rectifier heater, thereby improving the denitrification efficiency.

[0019] In a preferred embodiment, a set of catalysts is fixedly installed inside the other side of the reaction vessel, and the catalysts are disposed below the rectifier heater.

[0020] The technical effect of adopting the above-mentioned further solution is that the denitrification of flue gas can be effectively completed by using a catalyst to catalyze the flue gas.

[0021] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0022] 1. In use, when the catalyst fails or needs maintenance, the hydraulic lifting rod is activated. The hydraulic lifting rod pulls the baffle to rotate inside the main channel, so that the baffle is in contact with the inner wall of the main channel. This allows the flue gas entering from the inlet to be guided into the oxidation reaction device through the secondary channel, thereby completing a temporary reaction. This ensures continuous operation of the system and avoids losses from unplanned downtime.

[0023] 2. In use, this utility model can fully mix flue gas and ammonia water by setting multiple sets of nozzles to continuously spray air. Attached Figure Description

[0024] Figure 1 A schematic diagram of the main structure of a power plant flue gas denitrification device provided by this utility model;

[0025] Figure 2 This utility model provides a power plant flue gas denitrification device. Figure 1 Enlarged view of the structure at point A in the middle;

[0026] Figure 3 A schematic diagram of the internal structure of the main channel of a power plant flue gas denitrification device provided by this utility model;

[0027] Figure 4 This is a schematic diagram of the internal structure of the reaction vessel of a power plant flue gas denitrification device provided by this utility model.

[0028] Legend:

[0029] 101. Main channel; 102. Air inlet; 103. Rotating shaft; 104. Baffle; 105. Connecting plate; 106. Hydraulic lifting rod; 107. Fixing rod; 108. Secondary channel; 109. Oxidation reaction device; 201. Preheating channel; 202. Connection port; 203. Reaction vessel; 204. Guide plate; 205. Ammonia tank; 206. Conduit; 207. Nozzle; 208. Mixer; 209. Rectifier heater; 210. Catalyst; 211. Outlet. Detailed Implementation

[0030] 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.

[0031] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a power plant flue gas denitrification device, comprising: a main channel 101 and an ammonia tank 205. A rotating shaft 103 is rotatably installed inside the main channel 101. A baffle 104 is fixedly installed on one side of the outer surface of the rotating shaft 103. A secondary channel 108 is fixedly installed on one side of the outer surface of the main channel 101. A connecting plate 105 is fixedly installed at one end of the outer surface of the rotating shaft 103. A fixing rod 107 is fixedly installed on one side of the outer surface of the main channel 101. A hydraulic lifting rod 106 is rotatably installed at one end of the fixing rod 107. The other end of the hydraulic lifting rod 106 is rotatably installed at one end of the connecting plate 105. An air inlet 102 is fixedly installed on the upper side of the main channel 101.

[0032] like Figure 1 - Figure 4 As shown, an oxidation reaction device 109 is fixedly installed at the other end of the secondary channel 108. By setting up the oxidation reaction device 109, a temporary denitrification reaction can be carried out when the main unit is shut down for maintenance, thus avoiding losses caused by shutdown.

[0033] like Figure 1 - Figure 4 As shown, a preheating channel 201 is fixedly connected to the lower side of the outer surface of the main channel 101. Two connection ports 202 are fixedly installed on one side of the outer surface of the preheating channel 201. The flue gas can be preheated through the preheating channel 201.

[0034] like Figure 1 - Figure 4As shown, a reaction vessel 203 is fixedly installed at the other end of the two connection ports 202, and an outlet 211 is fixedly installed at the other end of the reaction vessel 203. A set of guide plates 204 are fixedly installed inside the reaction vessel 203. By setting the guide plates 204, the flue gas entering the reaction vessel 203 can move more evenly.

[0035] like Figure 1 - Figure 4 As shown, the output end of the ammonia tank 205 is fixedly connected to a conduit 206, and the other end of the conduit 206 is fixedly installed inside the reaction vessel 203. Multiple nozzles 207 are fixedly installed on the outside of the conduit 206. By setting multiple sets of nozzles 207, the flue gas and ammonia can be fully mixed.

[0036] like Figure 1 - Figure 4 As shown, two mixers 208 are fixedly installed inside the reaction vessel 203. Both mixers 208 are located above the nozzle 207. By setting two mixers 208, ammonia water and ammonia gas can be completely mixed and reacted.

[0037] like Figure 1 - Figure 4 As shown, a rectifier heater 209 is fixedly installed inside the other side of the reaction vessel 203. The rectifier heater 209 can heat the flue gas to the specified reaction temperature and improve the denitrification efficiency.

[0038] like Figure 1 - Figure 4 As shown, a set of catalysts 210 are fixedly installed inside the other side of the reaction vessel 203. The catalysts 210 are located below the rectifier heater 209. The denitrification of the flue gas can be effectively completed by the catalysts 210 catalyzing the flue gas.

[0039] Working principle: In operation, the hydraulic lifting rod 106 is first activated, which pushes the connecting plate 105 to rotate. The connecting plate 105 is fixedly connected to the rotating shaft 103 inside the main channel 101, so the rotating shaft 103 will rotate inside the main channel 101, thereby driving the upper baffle 104 to rotate, so that the baffle 104 completely blocks the secondary channel 108. This allows the flue gas entering from the air inlet 102 to enter the preheating channel 201 through the main channel 101. After the preheating channel 201 preheats the flue gas inside, it enters the reaction vessel 203 through the two connecting ports 202. Inside the reaction vessel 203, the flue gas first comes into contact with the guide plate 204. Guided by the guide plate 204, the flue gas moves upward smoothly. At this time, the ammonia tank 205 is activated, and the ammonia tank 205 continuously injects ammonia into the reaction vessel 203 through the conduit 206. Water, through multiple sets of nozzles 207, can ensure that flue gas and ammonia water are fully mixed. Then, after passing through two mixers 208, the flue gas and ammonia water are completely mixed and reacted. Subsequently, the flue gas continues to move forward along the reaction vessel 203 and comes into contact with the rectifier heater 209. The rectifier heater 209 heats the gas to the temperature required for the reaction. Then, the gas is denitrified under the action of multiple sets of catalysts 210 on the lower side. When the catalyst fails or needs maintenance, the hydraulic lifting rod 106 is activated. The hydraulic lifting rod 106 pulls and drives the baffle 104 to rotate inside the main channel 101, so that the baffle 104 fits against the inner wall of the main channel 101. Then, the flue gas entering from the air inlet 102 is guided into the oxidation reaction device 109 through the secondary channel 108, thereby completing the temporary reaction. This can ensure the continuous operation of the system and avoid unplanned downtime losses.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A power plant flue gas denitrification device, comprising: The main channel (101) and the ammonia tank (205) are characterized in that a rotating shaft (103) is rotatably installed inside the main channel (101), a baffle (104) is fixedly installed on one side of the outer surface of the rotating shaft (103), a secondary channel (108) is fixedly installed on one side of the outer surface of the main channel (101), a connecting plate (105) is fixedly installed at one end of the outer surface of the rotating shaft (103), a fixing rod (107) is fixedly installed on one side of the outer surface of the main channel (101), a hydraulic lifting rod (106) is rotatably installed at one end of the fixing rod (107), the other end of the hydraulic lifting rod (106) is rotatably installed at one end of the connecting plate (105), and an air inlet (102) is fixedly installed on the upper side of the main channel (101).

2. The power plant flue gas denitrification device according to claim 1, characterized in that: An oxidation reaction device (109) is fixedly installed at the other end of the secondary channel (108).

3. The power plant flue gas denitrification device according to claim 1, characterized in that: A preheating channel (201) is fixedly connected to the lower side of the outer surface of the main channel (101), and two connection ports (202) are fixedly installed on one side of the outer surface of the preheating channel (201).

4. A power plant flue gas denitrification device according to claim 3, characterized in that: A reaction vessel (203) is fixedly installed at the other end of the two connection ports (202), and an outlet (211) is fixedly installed at the other end of the reaction vessel (203). A set of guide plates (204) is fixedly installed inside the reaction vessel (203).

5. A power plant flue gas denitrification device according to claim 1, characterized in that: The output end of the ammonia tank (205) is fixedly connected to a conduit (206), the other end of the conduit (206) is fixedly installed inside the reaction vessel (203), and multiple nozzles (207) are fixedly installed on the outside of the conduit (206).

6. A power plant flue gas denitrification device according to claim 4, characterized in that: Two mixers (208) are fixedly installed inside the reaction vessel (203), and both mixers (208) are located on the upper side of the nozzle (207).

7. A power plant flue gas denitrification device according to claim 4, characterized in that: A rectifier heater (209) is fixedly installed inside the other side of the reaction vessel (203).

8. A power plant flue gas denitrification device according to claim 4, characterized in that: A set of catalysts (210) is fixedly installed inside the other side of the reaction vessel (203), and the catalysts (210) are located below the rectifier heater (209).

Images