A device for optimizing control of ammonia injection for denitration

Abstract

The utility model discloses a kind of denitration ammonia injection optimization control devices, including reaction tank, the reaction tank is provided with two, the opening is established in reaction tank upper end, sealing upper cover is connected on the opening, the connecting column is fixedly connected in sealing upper cover lower surface, the net frame is fixedly connected in the connecting column lower end, the filter screen is fixedly connected in the net frame, the air inlet pipe is fixedly connected in the reaction tank one side, the exhaust pipe is fixedly connected in the reaction tank lower end, reciprocating communication pipe is provided between two reaction tanks, one exhaust pipe and reciprocating communication pipe one end are fixedly connected in the reaction tank lower surface, another exhaust pipe and reciprocating communication pipe other end are fixedly connected in the reaction tank upper air inlet pipe, the reaction tank outer wall is embedded and is equipped with several spray heads. By unscrewing fixed bolt, the restriction to sealing upper cover can be removed, directly pull sealing upper cover upwards, sealing upper cover drives net frame, filter screen can be taken out inside reaction tank by connecting column, it is convenient to clean filter screen, avoid large particle accumulation and block filter hole.

Description

Technical Field

[0001] This utility model relates to a denitrification ammonia spraying optimization control device, and more particularly to a denitrification ammonia spraying optimization control device. Background Technology

[0002] The core principle of the denitrification ammonia injection optimization control device is to achieve precise control of the ammonia nitrogen molar ratio (NSR) and suppression of ammonia escape through multi-dimensional dynamic adjustment.

[0003] For example, a denitrification ammonia spray optimization control device disclosed in Chinese Patent Publication No. CN218077259U includes a reactor fixedly connected to one side of the main body of the device, an outlet fixedly connected to the bottom of the reactor, an inlet fixedly connected to the top of the reactor, an induction interface fixedly connected to one side of the outer wall of the reactor, a pipe interface fixedly connected to one side of the induction interface, a first reaction chamber fixedly connected to one side of the inner side of the reactor, a second reaction chamber fixedly connected to the bottom of the first reaction chamber, and a mesh plate fixedly connected to the bottom of the first reaction chamber. The induction interface and the pipe interface are arranged vertically, and there are two sets of induction interfaces and pipe interfaces, each set symmetrically arranged, which can facilitate the connection of detectors and ammonia spray pipes at multiple points to process the internal gas accurately. The first and second reaction chambers are located inside the reactor. The mesh plate has multiple holes on its surface to block large particles. Some problems have been found when using the aforementioned existing denitrification ammonia injection optimization control device; First, the mesh plate is used to block large particles. Although it effectively blocks large particles during use, the mesh plate is not equipped with a disassembly and cleaning mechanism, which leads to the problem of particles clogging the mesh plate and making it difficult for flue gas to flow. Secondly, before the boiler load increases or decreases, or even during the entire boiler operation, operators may use excessive ammonia injection to ensure that the denitrification system meets emission standards. Excessive ammonia injection will increase ammonia consumption and cause unnecessary economic losses. Utility Model Content

[0004] The purpose of this invention is to provide an optimized control device for denitrification ammonia injection, so as to solve the existing problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a denitrification ammonia spraying optimization control device, comprising two reaction tanks. Each reaction tank has an opening at its upper end, with a sealing cover connected to the upper edge of the opening. A connecting column is fixedly connected to the lower end of the sealing cover, and a mesh frame is fixedly connected to the lower end of the connecting column. A filter screen is fixedly connected inside the mesh frame. An air inlet pipe is fixedly connected to one side of each reaction tank, and an exhaust pipe is fixedly connected to the lower end of each reaction tank. A reciprocating connecting pipe is provided between the two reaction tanks. The exhaust pipe of one reaction tank is fixedly connected to one end of the reciprocating connecting pipe, and the air inlet pipe of the other reaction tank is fixedly connected to the other end of the reciprocating connecting pipe. Several nozzles are embedded and installed on the outer wall of each reaction tank.

[0006] Preferably, a nitrate concentration monitoring sensor is embedded in the air intake pipe, and an ammonia concentration monitoring sensor is embedded in the exhaust pipe.

[0007] Preferably, an annular delivery pipe is fitted onto the reaction vessel, the annular delivery pipe is fixedly connected to the nozzle, and a first flow control valve is connected to the annular delivery pipe via a pipeline, the other end of the first flow control valve being fixedly connected to the delivery pipe. An external pipeline is connected to the delivery pipe.

[0008] Preferably, a supporting flange is fixed to the inner wall of the reaction vessel, and a sealing rubber ring is provided on the supporting flange, which cooperates with the mesh frame.

[0009] Preferably, a first connecting lug is fixedly connected to the outer wall of the reaction vessel, and a second connecting lug is fixedly connected to the outer wall of the sealing cover. A fixing bolt is provided inside the second connecting lug, and the fixing bolt cooperates with the first connecting lug.

[0010] Preferably, a bypass pipe is connected between the two intake pipes, and a second flow control valve is installed in series on the bypass pipe.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. By unscrewing the fixing bolts, the restriction on the sealing cover can be released. The sealing cover can be pulled upwards directly, and the sealing cover can be removed from the inside of the reaction vessel by driving the mesh frame and filter screen through the connecting column. This makes it easier to clean the filter screen and avoid large particles accumulating and clogging the filter holes.

[0012] 2. By setting up an additional set of reaction tanks, the flue gas treated initially can be optimized again, ensuring that the outlet nitrification concentration meets the standard while controlling ammonia escape within a reasonable range. This ensures that the denitrification system meets emission standards while minimizing ammonia escape. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a partial structural diagram of the reaction vessel of this utility model; Figure 3 This is a partial exploded view of the present invention.

[0014] In the diagram: 1. Reaction vessel; 101. Inlet pipe; 102. Nitrate concentration monitoring sensor; 103. Exhaust pipe; 104. Ammonia concentration monitoring sensor; 105. First connecting lug; 106. Support flange; 2. Sealing cover; 201. Second connecting lug; 202. Fixing bolt; 203. Connecting column; 204. Mesh frame; 205. Filter screen; 3. Annular conveying pipe; 301. Nozzle; 302. First flow control valve; 303. Conveying pipe; 4. Reciprocating connecting pipe; 5. Bypass pipe; 501. Second flow control valve. Detailed Implementation

[0015] 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.

[0016] Please see Figure 1-3 This utility model provides a technical solution: a denitrification ammonia spraying optimization control device, including a reaction tank 1, of which two reaction tanks are provided. The upper end of the reaction tank 1 has an opening, and a sealing cover 2 is connected to the upper edge of the opening. A connecting column 203 is fixedly connected to the lower end of the sealing cover 2. A mesh frame 204 is fixedly connected to the lower end of the connecting column 203. A filter screen 205 is fixedly connected inside the mesh frame 204. An air inlet pipe 101 is fixedly connected to one side of the reaction tank 1. An exhaust pipe 103 is fixedly connected to the lower end of the reaction tank 1. A reciprocating connecting pipe 4 is provided between the two reaction tanks 1. The exhaust pipe 103 of one reaction tank 1 is fixedly connected to one end of the reciprocating connecting pipe 4, and the air inlet pipe 101 of the other reaction tank 1 is fixedly connected to the other end of the reciprocating connecting pipe 4. Several nozzles 301 are embedded and installed on the outer wall of the reaction tank 1.

[0017] In this implementation scheme, two sealed covers 2 are set up, one for front-end denitrification and the other for rear-end replacement denitrification. The main denitrification reaction is completed inside the front-end reaction tank 1. After the reaction in the front-end reaction tank 1 is completed, the flue gas is either transported from the exhaust pipe 103 to the reciprocating connecting pipe 4, and then transported again through the reciprocating connecting pipe 4 to the inlet pipe 101 on the other reaction tank 1, re-entering the other reaction tank 1. During the transport process, the concentration of nitrate and ammonia in the flue gas is re-detected by sensors to analyze whether it is necessary to introduce flue gas to consume the escaped ammonia again. The denitrification process is then reset in the rear-end reaction tank 1 to achieve optimal denitrification. The effect is to ensure that the outlet nitrate concentration meets the standard while controlling ammonia escape to <3ppm. The filter screen 205 is fixed inside the reaction tank 1 by the mesh frame 204. The filter screen 205 can filter large particles contained in the flue gas. The sealing cover 2 is sealed at the opening at the top of the reaction tank 1 to ensure the internal sealing of the reaction tank 1 during normal use. Later, after the sealing cover 2 is fixed, it can be pulled upward directly. The sealing cover 2, through the connecting column 203, drives the mesh frame 204 and the filter screen 205 to be removed from the inside of the reaction tank 1, which is convenient for cleaning the filter screen 205 and avoids the accumulation of large particles that clog the filter holes.

[0018] To achieve the purpose of injecting ammonia into the reaction tank 1, the device adopts the following technical solution: a nitrate concentration monitoring sensor 102 is embedded in the air inlet pipe 101, an ammonia concentration monitoring sensor 104 is embedded in the exhaust pipe 103, an annular conveying pipe 3 is sleeved on the reaction tank 1, the annular conveying pipe 3 is fixedly connected to the nozzle 301, and a first flow control valve 302 is connected to the annular conveying pipe 3 through a pipe, the other end of the first flow control valve 302 is fixedly connected to the conveying pipe 303.

[0019] The nitrate concentration monitoring sensor 102 can detect the nitrate concentration in the intake air, and the ammonia concentration monitoring sensor 104 can detect the ammonia concentration in the exhaust air. The ammonia injection amount is dynamically corrected by the PID controller to ensure that the outlet nitrate concentration meets the standard while controlling ammonia escape to <3ppm. The ammonia gas can be transported to the annular transport pipe 3 via the transport pipe 303. The first flow control valve 302 can control the ammonia gas flow rate, thereby controlling the ammonia gas injection speed. The ammonia gas is transported to the nozzle 301 via the annular transport pipe 3, and the nozzle 301 can inject ammonia into the reaction tank 1 to mix with the flue gas.

[0020] To achieve the purpose of diverting flue gas to the downstream reaction tank 1, the device adopts the following technical solution: a supporting flange 106 is fixedly connected to the inner wall of the reaction tank 1, and a sealing rubber ring is provided on the supporting flange 106. The supporting flange 106 cooperates with the mesh frame 204. A first connecting lug 105 is fixedly connected to the outer wall of the upper edge of the reaction tank 1. A second connecting lug 201 is fixedly connected to the outer wall of the sealing cover 2. A fixing bolt 202 is provided in the second connecting lug 201. The fixing bolt 202 cooperates with the first connecting lug 105. A bypass pipe 5 is connected between the two air inlet pipes 101. A second flow control valve 501 is installed in series on the bypass pipe 5.

[0021] A connecting post 203 is fixedly connected to the bottom of the sealing cover 2. A slot is provided on the inner side of the connecting post 203, and the mesh frame 204 is inserted into the slot.

[0022] The supporting flange 106 has an annular groove, and a sealing rubber ring is embedded in the annular groove. The sealing rubber ring has a slot, and the mesh frame 204 is inserted into the slot.

[0023] When the sealing cover 2 is placed at the upper edge of the reaction tank 1, the second connecting ear 201 is aligned with the first connecting ear 105. Then, the fixing bolt 202 is passed through the second connecting ear 201 and the first connecting ear 105 and the nut is screwed on, thereby fixing the sealing cover 2 to the reaction tank 1. At the same time, the filter screen 205 will be pressed against the support protrusion 106. The gap between the filter screen 205 and the support protrusion 106 can be sealed by the rubber sealing ring to prevent the flue gas from escaping directly to the lower reaction space without filtration. The bypass pipe 5 can directly guide the flue gas that has been partially treated from the front reaction tank 1 to the rear inlet pipe 101. When the amount of ammonia escape at the front is too large, the flue gas is re-introduced into the rear reaction tank 1 for re-reaction. The second flow control valve 501 can control the amount of flue gas introduced into the bypass pipe 5 according to the amount of escaped ammonia to avoid the problem of excessive flue gas diversion.

[0024] The working principle and usage process of this utility model are as follows: During use, the front inlet pipe 101 is connected to the flue gas pipeline. Flue gas enters the reaction tank 1 through the inlet pipe 101. The nitrate concentration monitoring sensor 102 detects the nitrate concentration in the flue gas. Based on the detected data, the PID controller dynamically adjusts the ammonia injection amount. The nozzle 301 injects a certain amount of ammonia into the reaction tank 1 to mix and react with the flue gas. Subsequently, it is discharged into the rear inlet pipe 101 through the exhaust pipe 103 and the reciprocating connecting pipe 4. Upon entering the rear reaction tank 1, the ammonia escape amount can be detected by the ammonia concentration monitoring sensor 104, which handles three different scenarios: The ammonia escape rate meets the standard, and the downstream reaction tank 1 does not take any action, directly discharging the flue gas from the lower exhaust pipe 103; If the second ammonia escape amount does not meet the standard, the second flow control valve 501 is controlled to open the bypass pipe 5 passage. The bypass pipe 5 will guide an appropriate amount of treated flue gas from the front end to the inside of the reaction tank 1. The nozzle 301 is controlled to spray an appropriate amount of ammonia again to re-react. The excess ammonia, together with the newly injected ammonia, will undergo a secondary reaction to consume the escaped ammonia and avoid the ammonia escape amount from not meeting the standard. To treat the nitrate concentration in the flue gas, the nitrate concentration needs to be re-detected by the nitrate concentration monitoring sensor 102 at the back end, and an appropriate amount of ammonia is injected again by the nozzle 301 to react again and remove the excess NOx in the flue gas.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A denitrification ammonia injection optimization control device, comprising a reaction tank (1), wherein two reaction tanks (1) are provided, characterized in that: The reaction vessel (1) has an opening at the top, and a sealing cover (2) is connected to the upper edge of the opening. A connecting column (203) is fixed to the bottom of the sealing cover (2). A mesh frame (204) is fixed to the bottom of the connecting column (203). A filter screen (205) is fixed inside the mesh frame (204). An air inlet pipe (101) is fixed to one side of the reaction vessel (1). An exhaust pipe (103) is fixed to the bottom of the reaction vessel (1). A reciprocating connecting pipe (4) is provided between the two reaction vessels (1). The exhaust pipe (103) of one of the reaction vessels (1) is fixed to one end of the reciprocating connecting pipe (4). The air inlet pipe (101) of the other reaction vessel (1) is fixed to the other end of the reciprocating connecting pipe (4). Several nozzles (301) are embedded in the outer wall of the reaction vessel (1).

2. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: A nitrate concentration monitoring sensor (102) is embedded in the air intake pipe (101), and an ammonia concentration monitoring sensor (104) is embedded in the exhaust pipe (103).

3. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: The reaction vessel (1) is fitted with an annular conveying pipe (3), which is fixedly connected to the nozzle (301). A first flow control valve (302) is connected to the annular conveying pipe (3) via a pipe. The other end of the first flow control valve (302) is fixedly connected to the conveying pipe (303), and a pipe is connected to the conveying pipe (303).

4. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: The inner wall of the reaction vessel (1) is fixed with a support flange (106), and a sealing rubber ring is provided on the support flange (106). The support flange (106) cooperates with the mesh frame (204).

5. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: The reaction vessel (1) is fixedly connected to the sealed top cover (2).

6. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: The reaction vessel (1) is fixedly connected to the outer wall of the upper edge with a first connecting lug (105), and the sealing cover (2) is fixedly connected to the outer wall of a second connecting lug (201). A fixing bolt (202) is provided inside the second connecting lug (201), and the fixing bolt (202) cooperates with the first connecting lug (105).

7. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: A bypass pipe (5) is connected between the two intake pipes (101), and a second flow control valve (501) is installed in series on the bypass pipe (5).

8. The denitrification ammonia injection optimization control device according to claim 1, characterized in that: A connecting post (203) is fixedly connected to the bottom of the sealing cover (2). The connecting post (203) has a slot on its inner side, and the wire mesh frame (204) is inserted into the slot.

9. The denitrification ammonia injection optimization control device according to claim 4, characterized in that: The supporting protrusion (106) is provided with an annular groove, and a sealing rubber ring is embedded in the annular groove.

10. The denitrification ammonia injection optimization control device according to claim 9, characterized in that: The sealing rubber ring is provided with a groove, and the mesh frame (204) is inserted into the groove.

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