A denitration ammonia injection device

Abstract

This invention relates to the field of boiler power generation gas purification technology, specifically to a denitrification ammonia injection device. It includes two identical and mirror-connected purification reaction towers. A first working spiral tube and a second working spiral tube are connected within each purification reaction tower. Both the first and second working spiral tubes are parallel to the axis of the purification reaction tower. The first working spiral tube, the second working spiral tube, and the purification reaction tower are all connected to the outside environment through a reaction liquid inlet pipe group. A gas detector is installed at the bottom of the first working spiral tube. This invention achieves flue gas purification through three-stage denitrification ammonia injection. The first working spiral tube achieves primary purification, the second working spiral tube simultaneously achieves primary and secondary purification, and the inner cavity of the purification reaction tower provides final purification of the residual gas in the first and second working spiral tubes, solving the problem in existing technologies where harmful gases cannot be completely purified.

Description

Technical Field

[0001] This invention relates to the field of boiler power generation gas purification technology, and more specifically, to a denitrification ammonia injection device. Background Technology

[0002] Electricity is a vital energy source for national economic development, and thermal power generation is a major method of electricity production in my country and many other countries worldwide. Thermal power generation also involves generating electricity through a boiler. The heat released from burning coal in the boiler heats water into steam at a specific pressure and temperature. This steam then travels through pipes to a turbine, where it expands and performs work, driving a generator to rotate at high speed and generate electricity. The steam that has completed its work in the turbine is discharged into a steam cooler and condenses into water, which is then pumped to a deaerator. In the deaerator, the water is heated by steam extracted from the turbine through the extraction pipe, removing any contained gases. Finally, it is pumped back to the boiler by the feedwater pump to repeat the entire cycle. In this type of thermal power plant, three types of energy conversion processes occur: the chemical energy of coal is converted into thermal energy in the boiler; thermal energy is converted into mechanical energy in the turbine; and mechanical energy is converted into electrical energy in the generator. The main equipment for energy conversion—the boiler, turbine, and generator—are known as the three main components of a thermal power plant, with the boiler being the most fundamental energy conversion device among them.

[0003] During boiler power generation, a large amount of gases are generated, such as nitrous oxide (NO), hydrogen dioxide (NO2), and nitrous oxide (N2O), which are harmful to the environment. Current technologies typically use ammonia injection to convert these harmful gases into ammonia gas and water vapor, thereby purifying the gases. However, in the process of denitrification using ammonia injection, the limited spraying position may result in a small portion of the gas remaining untreated and being emitted.

[0004] It should be noted that the information disclosed in the background section of this invention is intended only to enhance the understanding of the overall background of this invention, and should not be construed as an admission or in any way implying that such information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this application is to provide a denitrification ammonia spraying device, which solves the problem that harmful gases cannot be completely purified in the prior art.

[0006] The technical solution of this application:

[0007] This invention provides a denitrification ammonia spraying device, comprising two identical and mirror-connected purification reaction towers. A first working spiral tube and a second working spiral tube are connected inside the purification reaction tower. Both the first working spiral tube and the second working spiral tube are parallel to the axis of the purification reaction tower. The first working spiral tube, the second working spiral tube, and the purification reaction tower are all connected to the outside through a reaction liquid input pipe group. A gas detector is installed at the bottom of the first working spiral tube.

[0008] Furthermore, the outer diameter of the first working spiral tube is larger than the outer diameter of the second working spiral tube, and the length of the first working spiral tube is smaller than the length of the second working spiral tube.

[0009] Furthermore, the side wall of the purification reaction tower is provided with a first inlet and a second inlet for inputting the gas to be purified. The first inlet is located in the middle of the side wall of the purification reaction tower, and the second inlet is located at the top of the side wall of the purification reaction tower. The side wall of the purification reaction tower is also provided with a plurality of third inlets for inputting the working liquid that reacts with the harmful gas. The reaction liquid input pipe assembly is connected to the first inlet, the second inlet, and the third inlets.

[0010] Furthermore, the purification reaction tower is also equipped with a first purification transition pipe, which is connected to the bottom end of the first working spiral pipe, and the top end of the first purification transition pipe extends to the third inlet position.

[0011] Furthermore, the top end of the first purification transition pipe has a first working branch pipe and a second working branch pipe, the first working branch pipe being connected to the purification reaction tower, and the second working branch pipe being connected to the top of the second working spiral pipe.

[0012] Furthermore, a second purification transition pipe is also provided inside the purification reaction tower. The second purification transition pipe is arranged in parallel with the first purification transition pipe. The second purification transition pipe is connected to the bottom end of the second working spiral pipe, and the top end of the first purification transition pipe extends to above the third inlet.

[0013] Furthermore, the reaction liquid input pipe assembly includes a liquid guide pipe, several liquid inlet pipes, and several spray pipe assemblies. The liquid inlet pipes are connected to the third input port. One end of the liquid guide pipe is connected to the liquid inlet pipe, and the other end extends to the bottom of the inner cavity of the purification reaction tower. The several spray pipe assemblies are evenly spaced and connected to the liquid guide pipe.

[0014] Furthermore, the spray pipe assembly includes a first spray pipe and a second spray pipe, the center of the first spray pipe and the center of the second spray pipe are vertically connected to form a connecting part, and several of the connecting parts are connected to the liquid guide pipe. Both the first spray pipe and the second spray pipe are provided with several spray holes. Both the first spray pipe and the second spray pipe are connected to the first working spiral pipe, and both the first spray pipe and the second spray pipe are connected to the second working spiral pipe.

[0015] Furthermore, the spray pipe assembly also includes a third spray pipe and a fourth spray pipe connected to the liquid inlet pipe. The third spray pipe is connected to a plurality of third inlet short pipes, and the fourth spray pipe is connected to a plurality of fourth inlet short pipes. The plurality of third inlet short pipes are respectively connected to the pipe coil on the first working spiral pipe, and the plurality of fourth inlet short pipes are respectively connected to the pipe coil on the second working spiral pipe.

[0016] Furthermore, an air pump and a water pump are installed in the first working spiral tube, the second working spiral tube, the first inlet, the second inlet, the third inlet, the first purification transition tube, the second purification transition tube, the first working branch tube, the second working branch tube, the liquid guide tube, the liquid inlet tube, the first spray tube, and the second spray tube.

[0017] The technical solution of this application has at least the following advantages and beneficial effects:

[0018] This invention provides a denitrification ammonia spraying device. The denitrification ammonia spraying in this device is achieved through three-stage purification. The harmful gas to be reacted is divided into two parts and input into the purification reaction tower at two different times. The harmful gas input during these two time periods is divided into a first-stage gas and a second-stage gas. The first-stage purification process is as follows: the first-stage gas is input from outside the purification reaction tower into the first working spiral tube. Simultaneously, a first working liquid for reacting with the harmful gas is input into the first working spiral tube through the reaction liquid input pipe group. The first working liquid and the first-stage gas react in the first working spiral tube to produce purified gas. The purified gas still contains a small portion of the reacted harmful gas. The mixture of purified gas, first working liquid, and unpurified harmful gas is divided into two parts: one part is input into the second working spiral tube, and the other part is input into the purification reaction tower. The second-stage purification process involves the following: When the gas detector detects that the purified gas has rotated to the bottom of the first working spiral tube, a second working liquid is introduced into the second working spiral tube through the reaction liquid input pipe group to react with the harmful gas. Simultaneously, the second-stage gas is introduced into the purification reaction tower from outside the purification reaction tower. The second working liquid reacts with the residual gas from the first stage and the second-stage gas to produce purified gas. The third-stage purification process involves the residual gas from the first and second stages entering the purification reaction tower from the tops of the first and second working spiral tubes, respectively. At this time, the reaction liquid input pipe group introduces a third working liquid into the purification reaction tower to perform final purification of the remaining residual gas from the first and second stages, thereby achieving complete purification of the harmful gas. This invention solves the problem of incomplete purification of harmful gases in existing technologies. Attached Figure Description

[0019] Figure 1 This is one of the structural schematic diagrams of the present invention;

[0020] Figure 2 This is the front view of the present invention;

[0021] Figure 3 for Figure 2 One of the sectional views along line A in the middle;

[0022] Figure 4 for Figure 3 Enlarged view at point C;

[0023] Figure 5 for Figure 2 Sectional view along direction A, part two;

[0024] Figure 6 for Figure 5 Enlarged view at point D;

[0025] Figure 7 for Figure 2 Sectional view along line B;

[0026] Figure 8 This is a side view of the present invention;

[0027] Figure 9 This is the second structural schematic diagram of the present invention;

[0028] Figure 10 This is a schematic diagram of the connecting frame in the present invention;

[0029] In the diagram: 1-Purification reaction tower; 2-First working spiral pipe; 3-Second working spiral pipe; 4-First inlet; 5-Second inlet; 6-Third inlet; 7-First purification transition pipe; 8-Second purification transition pipe; 9-First working branch pipe; 10-Second working branch pipe; 11-Liquid guide pipe; 12-Liquid inlet pipe; 13-First spray pipe; 14-Second spray pipe; 15-Spray hole; 16-Connecting frame. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0031] Please refer to Figures 1-10 The present invention provides a denitrification ammonia spraying device, which includes two purification reaction towers 1 with identical structures and connected in a mirror image. A first working spiral tube 2 and a second working spiral tube 3 are arranged inside the purification reaction tower 1 and are connected to each other. The first working spiral tube 2 and the second working spiral tube 3 are both parallel to the axis of the purification reaction tower 1. The first working spiral tube 2, the second working spiral tube 3 and the purification reaction tower 1 are all connected to the outside through a reaction liquid input pipe group. A gas detector is arranged at the bottom of the first working spiral tube 2.

[0032] It is worth noting that the denitrification ammonia injection in this device is achieved through three-stage purification. The harmful gas to be reacted is divided into two parts and input into the purification reaction tower 1 at two different times. The harmful gas input in these two time periods is divided into first-stage gas and second-stage gas. The first-stage purification process is as follows: the first-stage gas is input from outside the purification reaction tower 1 into the first working spiral tube 2. At the same time, the first working liquid for reacting with the harmful gas is input into the first working spiral tube 2 through the reaction liquid input pipe group. The first working liquid and the first-stage gas react in the first working spiral tube 2 to produce purified gas. The purified gas still contains a small part of the reacted harmful gas. The mixture of purified gas, first working liquid, and unpurified harmful gas is divided into two parts. One part is input into the second working spiral tube 3, and the other part is input into the purification reaction tower 1. The second-stage purification process is as follows: When the gas detector detects that the purified gas has rotated to the bottom of the first working spiral tube 2, a second working liquid for reacting with the harmful gas is introduced into the second working spiral tube 3 through the reaction liquid input pipe group. Simultaneously, the second-stage gas is introduced into the purification reaction tower 1 from outside the purification reaction tower 1. The second working liquid reacts with the residual gas from the first stage and the second-stage gas to produce purified gas. The third-stage purification process is as follows: The residual gas from the first stage and the residual gas from the second stage enter the purification reaction tower 1 from the top of the first and second working spiral tubes 2 and 3, respectively. At this time, the reaction liquid input pipe group introduces a third working liquid into the purification reaction tower 1 to perform final purification of the remaining residual gas from the first and second stages, thereby achieving complete purification of the harmful gas. This embodiment solves the problem that harmful gases cannot be completely purified in the prior art. Example

[0033] Based on Example 1, a denitrification ammonia spraying device is provided, specifically: a denitrification ammonia spraying device includes two identical and mirror-connected purification reaction towers 1. A first working spiral tube 2 and a second working spiral tube 3 are connected inside the purification reaction tower 1. Both the first working spiral tube 2 and the second working spiral tube 3 are parallel to the axis of the purification reaction tower 1. The first working spiral tube 2, the second working spiral tube 3, and the purification reaction tower 1 are all connected to the outside through a reaction liquid input pipe group. A gas detector is installed at the bottom of the first working spiral tube 2.

[0034] Furthermore, the outer diameter of the first working spiral tube 2 is larger than the outer diameter of the second working spiral tube 3, and the length of the first working spiral tube 2 is shorter than the length of the second working spiral tube 3. By setting the outer diameter of the first working spiral tube 2 to be larger than the outer diameter of the second working spiral tube 3, the efficiency of the first-stage gas purification can be improved. The shorter length of the first working spiral tube 2 ensures more thorough purification of residual gas in the first stage. By extending the outer diameter of the first working spiral tube to be larger than the outer diameter of the second working spiral tube 3, and the shorter length of the first working spiral tube 2 to be shorter than the length of the second working spiral tube 3, the time required for the secondary purification process is increased.

[0035] Furthermore, the side wall of the purification reaction tower 1 is provided with a first inlet 4 and a second inlet 5 for inputting the gas to be purified. The first inlet 4 is located in the middle of the side wall of the purification reaction tower 1, and the second inlet 5 is located at the top of the side wall of the purification reaction tower 1. The side wall of the purification reaction tower 1 is also provided with several third inlets 6 for inputting the working liquid that reacts with the harmful gas. The reaction liquid input pipe assembly is connected to the first inlet 4, the second inlet 5, and the third inlet 6.

[0036] Furthermore, a first purification transition pipe 7 is also provided inside the purification reaction tower 1. The first purification transition pipe 7 is connected to the bottom end of the first working spiral pipe 2, and the top end of the first purification transition pipe 7 extends to the position of the third inlet 6. The first inlet 4 is used to input the first stage gas, and the second inlet 5 is used to input the first stage gas.

[0037] Furthermore, the first purification transition pipe 7 has a first working branch pipe 9 and a second working branch pipe 10 at its top. The first working branch pipe 9 is connected to the purification reaction tower 1, and the second working branch pipe 10 is connected to the top of the second working spiral pipe 3. The gas is divided into two parts through the first working branch pipe 9 and the second working branch pipe 10, which promotes the completeness of purification.

[0038] Furthermore, a second purification transition pipe 8 is also provided inside the purification reaction tower 1. The second purification transition pipe 8 and the first purification transition pipe 7 are arranged in parallel. The second purification transition pipe 8 is connected to the bottom end of the second working spiral pipe 3, and the top end of the first purification transition pipe 7 extends to above the third inlet 6.

[0039] Furthermore, the reaction liquid input pipe assembly includes a liquid guide pipe 11, several liquid inlet pipes 12, and several spray pipe assemblies. The liquid inlet pipes 12 are connected to the third input port 6. One end of the liquid guide pipe 11 is connected to the liquid inlet pipe 12, and the other end extends to the bottom of the inner cavity of the purification reaction tower 1. Several spray pipe assemblies are evenly spaced and connected to the liquid guide pipe 11.

[0040] Furthermore, the spray pipe assembly includes a first spray pipe 13 and a second spray pipe 14. The centers of the first spray pipe 13 and the second spray pipe 14 are vertically connected to form a connecting section. Several connecting sections are connected to the liquid guide pipe 11. Both the first spray pipe 13 and the second spray pipe 14 have several spray holes 15. Both the first spray pipe 13 and the second spray pipe 14 are connected to the first working spiral pipe 2 and the second working spiral pipe 3. The reaction liquid can be simultaneously injected into the purification reaction tower 1, the first working spiral pipe 2, and the second working spiral pipe 3 through the liquid guide pipe 11, the liquid inlet pipe 12, the first spray pipe 13, and the second spray pipe 14.

[0041] Furthermore, the spray pipe assembly also includes a third spray pipe and a fourth spray pipe connected to the liquid inlet pipe 12. The third spray pipe is connected to several third inlet short pipes, and the fourth spray pipe is connected to several fourth inlet short pipes. The third inlet short pipes are respectively connected to the coils on the first working spiral pipe 2, and the fourth inlet short pipes are respectively connected to the coils on the second working spiral pipe 3. The third and fourth inlet short pipes are used to inject reaction liquid into the first working spiral pipe 2 and the second working spiral pipe 3.

[0042] Furthermore, the two purification reaction towers 1 are connected by a connecting frame 16, facilitating their connection. A working ladder is attached to the connecting frame 16 for easy climbing and maintenance. A liquid collection tank is installed at the bottom of the inner cavity of each purification reaction tower 1, enabling liquid collection for secondary use and improving resource utilization. Several temperature controllers are installed on the sidewalls of the inner cavity of each purification reaction tower 1 to control the reaction time. Air pumps and water pumps are installed in the first working spiral tube 2, the second working spiral tube 3, the first inlet 4, the second inlet 5, the third inlet 6, the first purification transition tube 7, the second purification transition tube 8, the first working branch tube 9, the second working branch tube 10, the liquid guide tube 11, the liquid inlet tube 12, the first spray tube 13, and the second spray tube 14. These pumps promote gas and liquid flow, as well as gas-liquid mixing.

[0043] The denitrification and ammonia injection in this device achieves purification through three stages. Harmful gases generated by the boiler during power generation are transported to purification reaction tower 1 via a Y-shaped pipeline. After a certain period, the gases are divided into two parts, which are then fed into purification reaction tower 1 at specified intervals. These two parts are referred to as the first-stage gas and the second-stage gas, respectively. The first working liquid, second working liquid, and third working liquid are the same liquid, named according to their input paths.

[0044] The first-stage purification process is as follows: The first-stage gas is input from the outside of the purification reaction tower 1 through the first inlet 4 into the first working spiral tube 2. At this time, the first working liquid is input into the first working spiral tube 2 and the inner cavity of the purification reaction tower 1 through the liquid inlet pipe 12, the liquid guide pipe 11, the third inlet short pipe, the first spray pipe 13, and the second spray pipe 14 via the air pump and the water pump. The first working liquid is used to react with the harmful gas. The first working liquid and the first-stage gas react in the first working spiral tube 2 to produce purified gas. The purified gas still contains a small part of the reacted harmful gas. The mixture of purified gas, first working liquid, and unpurified harmful gas is passed through the first purification transition pipe 7 and then through the first working branch pipe 9 and the second working branch pipe 10 and is divided into two parts. The mixture from the second working branch pipe 10 is input into the second working spiral tube 3 for secondary purification, and the mixture from the first working branch pipe 9 is input into the purification reaction tower 1 for secondary purification.

[0045] The second-stage purification process is as follows: When the gas detector detects that the purified gas has rotated to the bottom of the first working spiral tube 2, the air pump and water pump will input the second working liquid into the second working spiral tube 3 and the inner cavity of the purification reaction tower 1 through the liquid inlet pipe 12, the liquid guide pipe 11, the fourth inlet short pipe, the first spray pipe 13, and the second spray pipe 14. At the same time, the second-stage gas is input into the second working spiral tube 3 from the outside of the purification reaction tower 1 through the second inlet 5. The second working liquid reacts with the residual gas of the first-stage gas and the second-stage gas to produce purified gas.

[0046] The third-stage purification process is as follows: the residual gases from the first stage and the second stage enter the purification reaction tower 1 from the top of the first working spiral tube 2 and the second working spiral tube 3, respectively. The air pump and water pump input the third working liquid into the inner cavity of the purification reaction tower 1 through the liquid inlet pipe 12, the liquid guide pipe 11, the first spray pipe 13, and the second spray pipe 14 to perform final purification on the residual gases from the first stage and the second stage, thereby achieving complete purification of the harmful gases.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0048] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and 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 denitrification ammonia injection device, characterized in that, include: Two identical purification reaction towers (1) are connected in a mirror image. The purification reaction tower (1) is provided with a first working spiral tube (2) and a second working spiral tube (3) that are connected to each other. The first working spiral tube (2) and the second working spiral tube (3) are both parallel to the axis of the purification reaction tower (1). The first working spiral tube (2), the second working spiral tube (3) and the purification reaction tower (1) are all connected to the outside through a reaction liquid input pipe group. A gas detector is provided at the bottom of the first working spiral tube (2). The purification reaction tower (1) has a first inlet (4) and a second inlet (5) on its side wall for inputting the gas to be purified. The first inlet (4) is located in the middle of the side wall of the purification reaction tower (1), and the second inlet (5) is located at the top of the side wall of the purification reaction tower (1). The side wall of the purification reaction tower (1) also has several third inlets (6) for inputting the working liquid that reacts with the harmful gas. The reaction liquid input pipe assembly is connected to the first inlet (4), the second inlet (5), and the third inlet (6). The purification reaction tower (1) is also provided with a first purification transition pipe (7), which is connected to the bottom end of the first working spiral pipe (2), and the top end of the first purification transition pipe (7) extends to the position of the third inlet (6). The first purification transition pipe (7) has a first working branch pipe (9) and a second working branch pipe (10) at its top end. The first working branch pipe (9) is connected to the purification reaction tower (1), and the second working branch pipe (10) is connected to the top of the second working spiral pipe (3). The purification reaction tower (1) is also provided with a second purification transition pipe (8), which is arranged in parallel with the first purification transition pipe (7). The second purification transition pipe (8) is connected to the bottom end of the second working spiral pipe (3), and the top end of the first purification transition pipe (7) extends to the top of the third inlet (6). The first input port (4) is connected to the first working spiral tube (2), and the second input port (5) is connected to the second working spiral tube (3).

2. The ammonia spraying device for denitrification according to claim 1, characterized in that, The outer diameter of the first working spiral tube (2) is greater than the outer diameter of the second working spiral tube (3), and the length of the first working spiral tube (2) is less than the length of the second working spiral tube (3).

3. The ammonia spraying device for denitrification according to claim 1, characterized in that, The reaction liquid input pipe assembly includes a liquid guide pipe (11), several liquid inlet pipes (12), and several spray pipe assemblies. The liquid inlet pipes (12) are connected to the third input port (6). One end of the liquid guide pipe (11) is connected to the liquid inlet pipe (12), and the other end extends to the bottom of the inner cavity of the purification reaction tower (1). The several spray pipe assemblies are evenly spaced and connected to the liquid guide pipe (11).

4. The ammonia spraying device for denitrification according to claim 3, characterized in that, The spray pipe assembly includes a first spray pipe (13) and a second spray pipe (14). The center of the first spray pipe (13) and the center of the second spray pipe (14) are vertically connected to form a connecting part. Several of the connecting parts are connected to the liquid guide pipe (11). The first spray pipe (13) and the second spray pipe (14) are each provided with several spray holes (15). The first spray pipe (13) and the second spray pipe (14) are both connected to the first working spiral pipe (2). The first spray pipe (13) and the second spray pipe (14) are both connected to the second working spiral pipe (3).

5. The ammonia spraying device for denitrification according to claim 4, characterized in that, The spray pipe assembly also includes a third spray pipe and a fourth spray pipe connected to the liquid inlet pipe (12). The third spray pipe is connected to a plurality of third inlet short pipes, and the fourth spray pipe is connected to a plurality of fourth inlet short pipes. The plurality of third inlet short pipes are respectively connected to the pipe coil on the first working spiral pipe (2), and the plurality of fourth inlet short pipes are respectively connected to the pipe coil on the second working spiral pipe (3).

6. The ammonia spraying device for denitrification according to claim 4, characterized in that, An air pump and a water pump are installed in the first working spiral tube (2), the second working spiral tube (3), the first input port (4), the second input port (5), the third input port (6), the first purification transition tube (7), the second purification transition tube (8), the first working branch tube (9), the second working branch tube (10), the liquid guide tube (11), the liquid inlet tube (12), the first spray tube (13), and the second spray tube (14).

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