Ammonia water evaporation spray gun for flue gas heat exchange

Abstract

The utility model discloses an ammonia water evaporation spray gun for flue gas heat exchange, which belongs to the technical field of kiln flue gas denitration and comprises a gun outer pipe, a gun inner pipe, a gun inner pipe plug, a central pipe, a central pipe plug, an ammonia gas spray pipe, a diluted ammonia gas spray pipe, a reducing agent solution connecting pipe and a diluted air interface. The outer gun pipe is fixedly installed on the side wall of a high-temperature flue, the inner gun pipe is fixedly installed on the outer gun pipe through the inner gun pipe plug, a hole is formed in the end of the inner gun pipe, the center pipe is fixedly installed in the inner gun pipe, and a plurality of holes are formed in the outer gun pipe and the inner gun pipe on the leeward side of high-temperature and high-dust flue gas and used for fixedly installing the diluted ammonia gas spraying pipe. According to the utility model, the process of preparing ammonia gas by evaporating a denitration reducing agent solution in high-temperature and high-dust flue gas through heat exchange of the gun barrel and uniformly spraying the ammonia gas is realized, the traditional denitration reducing agent ammonia preparation system (including a liquid ammonia evaporation system, an ammonia water evaporation system, a urea pyrolysis system, a urea hydrolysis system and the like) is simplified, and the investment and operation costs are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of furnace flue gas denitration, in particular to an ammonia water evaporation spray gun for flue gas heat exchange. Background Art

[0002] Environment and development are long-term issues facing human society. In recent years, air pollution caused by the emission of nitrogen oxides has become increasingly serious. Currently, about 70% of NOx in China is produced by coal combustion, and power plant boilers and industrial kilns, as the main coal-fired equipment, have become the focus of future control of NOx emissions.

[0003] Among the existing methods for removing NOx, the selective catalytic reduction method (SCR) has been widely used due to its advantages of high NOx removal efficiency and low amount of reducing agent. Selective catalytic reduction technology (SCR) uses reducing agents to selectively react with NOx in flue gas and generate non-toxic and non-polluting nitrogen (N2) and water (H2O), achieving the purpose of denitrification and environmental protection.

[0004] However, the traditional reducing agent (including liquid ammonia, ammonia water, urea) ammonia production system requires the installation of complex flue gas or steam heat exchangers, evaporators or pyrolyzers, and hydrolyzer systems. There is also a technology that uses reducing agent solution to be directly sprayed into the flue, but the reducing agent solution directly sprayed into the flue will be carried away by a large amount of high-concentration fly ash, and sufficient ammonia cannot be produced. In addition, the ammonia-containing fly ash will have a negative impact on downstream equipment and affect the recovery and reuse of boiler coal ash. Utility Model Content

[0005] The utility model aims to provide an ammonia water evaporation spray gun for flue gas heat exchange to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An ammonia water evaporation spray gun for flue gas heat exchange, comprising an outer gun tube, an inner gun tube is arranged in the inner cavity of the outer gun tube, a central tube is arranged in the inner cavity of the inner gun tube, a plurality of ammonia nozzles are fixedly sleeved on the side of the central tube, a dilution ammonia nozzle is fixedly sleeved on the side of the ammonia nozzle, a dilution air interface is opened at one end of the outer gun tube, a dustproof mechanism is installed in the inner cavity of the dilution air interface, and a reducing agent solution connection pipe is arranged on the side of the outer gun tube;

[0008] The dust-proof mechanism comprises an air collecting pipe, one end of which is fixedly sleeved with an air inlet pipe, the other end of which is provided with a turntable, the side of which is fixedly connected with a fixing rod, and the side of which is provided with a plurality of air outlets.

[0009] As a further solution of the utility model, a second thread groove is provided on the periphery of the turntable, and a third thread groove is provided on the inner wall of one end of the air collecting pipe close to the turntable, and the second thread groove and the third thread groove are threadedly connected to each other.

[0010] As a further solution of the utility model, a first thread groove is provided on the periphery of the air collecting pipe, and the first thread groove and the inner wall of the dilution air interface are threadedly rotatably sleeved with each other.

[0011] As a further solution of the utility model, a gun inner tube plug is fixedly installed on the side of the gun inner tube, and one end of the gun inner tube plug away from the gun inner tube is fixedly installed on the gun outer tube.

[0012] As a further solution of the utility model, the end of the inner tube of the gun is fixedly sleeved with the periphery of the central tube, and the other end of the central tube is fixedly installed with a central tube plug.

[0013] As a further solution of the utility model, a high-temperature flue is provided on the periphery of the gun outer tube, the periphery of the high-temperature flue and the periphery of the gun outer tube are fixedly sleeved together, and the side of the gun outer tube and the periphery of the reducing agent solution pipe are fixedly sleeved together.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. The utility model realizes the process of evaporating the denitration reducing agent solution by gun barrel heat exchange in high-temperature and high-dust flue gas to produce ammonia and evenly spraying the ammonia, simplifies the traditional denitration reducing agent ammonia production system (including liquid ammonia evaporation system, ammonia water evaporation system, urea thermal decomposition system, urea hydrolysis system, etc.), and reduces investment and operation costs.

[0016] 2. The utility model takes out the air collecting pipe and makes it away from the dilution air interface, then takes out the air collecting pipe in a forward spiral and makes it away from the dilution air interface, then holds the fixing rod and rotates the fixing rod, and the rotation of the fixing rod can drive the turntable to rotate. When the turntable is rotated by force, it will spiral out of the side of the air collecting pipe. When the turntable is away from the air collecting pipe, one end of the air collecting pipe is in an open state. At this time, the dust and impurities in the inner cavity of the air collecting pipe can be cleaned, thereby cleaning the inner cavity of the dustproof mechanism and ensuring the filtering and dustproof effect of the dustproof mechanism on the device. After cleaning, the fixing rod can be held again and rotated in the opposite direction, thereby driving the turntable to rotate in the opposite direction, so that the second thread groove can be spirally connected with the third thread groove. Since the second thread groove and the third thread groove are mutually threadedly connected, the contact gap between the turntable and the air collecting pipe can be minimized, and the dilution and dispersion of the dilution air can be prevented, thereby ensuring the dilution effect of the dilution air. Then the air collecting pipe is spirally entered into the dilution air interface again, thereby completing the installation and disassembly of the dustproof mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a schematic diagram of the overall structure of an ammonia evaporation spray gun for flue gas heat exchange.

[0018] Figure 2 This is a structural diagram of the dust prevention mechanism in an ammonia evaporation spray gun for flue gas heat exchange.

[0019] Figure 3 The present invention is a cross-sectional view of a dust prevention mechanism in an ammonia water evaporation spray gun for flue gas heat exchange.

[0020] Figure 4 This is a disassembled diagram of the dust prevention mechanism in an ammonia evaporation spray gun for flue gas heat exchange.

[0021] In the figure: 1. high-temperature flue; 2. gun outer tube; 3. gun inner tube; 4. center tube; 5. diluted ammonia nozzle; 6. ammonia nozzle; 7. reducing agent solution connecting pipe; 8. gun inner tube plug; 9. dilution air interface; 10. center tube plug; 11. air collecting pipe; 12. first threaded groove; 13. air inlet pipe; 14. turntable; 15. air outlet; 16. fixing rod; 17. second threaded groove; 18. third threaded groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example 1: Please refer to Figures 1 to 4 In an embodiment of the utility model, an ammonia water evaporation spray gun for flue gas heat exchange comprises a gun outer tube 2, the inner cavity of the gun outer tube 2 is provided with a gun inner tube 3, the inner cavity of the gun inner tube 3 is provided with a central tube 4, the side of the central tube 4 is fixedly sleeved with a plurality of ammonia nozzles 6, the side of the ammonia nozzle 6 is fixedly sleeved with a dilution ammonia nozzle 5, one end of the gun outer tube 2 is provided with a dilution air interface 9, the inner cavity of the dilution air interface 9 is installed with a dustproof mechanism, and the side of the gun outer tube 2 is provided with a reducing agent solution connection pipe 7; specifically, when the denitration reducing agent solution flows into the interlayer formed by the gun outer tube and the gun inner tube, the high-temperature flue gas heats the solution in the interlayer to realize the vaporization process to produce high-concentration ammonia, and the high-concentration ammonia is sprayed out through the central tube and the ammonia nozzle, and is mixed with the dilution air introduced into the gun inner tube at the dilution ammonia nozzle and sprayed out of the gun outer tube into the high-temperature and high-dust flue gas;

[0024] The dust prevention mechanism includes an air collecting pipe 11, one end of which is fixedly sleeved with an air inlet pipe 13, and the other end of the air collecting pipe 11 is provided with a rotating disk 14, the side of which is fixedly connected with a fixing rod 16, and the side of the rotating disk 14 is provided with a plurality of air outlets 15; by providing the air outlets 15 on the side of the rotating disk 14, dust and impurities in the diluted air can be filtered without affecting the circulation of the diluted air;

[0025] See also Figure 3 The outer periphery of the turntable 14 is provided with a second thread groove 17, and the inner wall of the end of the air collecting pipe 11 close to the turntable 14 is provided with a third thread groove 18, and the second thread groove 17 and the third thread groove 18 are threadedly connected to each other. By providing the second thread groove 17 on the outer periphery of the turntable 14 and providing the third thread groove 18 on the inner wall of the air collecting pipe 11, the turntable 14 can be easily installed or disassembled, and the dust and impurities in the inner cavity of the air collecting pipe 11 can be cleaned by adjusting the contact state between the turntable 14 and the air collecting pipe 11. By cleaning the inner cavity of the air collecting pipe 11, the cleanliness of the inner cavity of the air collecting pipe is ensured, and the filtering effect of the dust prevention mechanism on dust and impurities is increased;

[0026] See also Figure 3 A first thread groove 12 is provided on the periphery of the air collecting pipe 11, and the first thread groove 12 and the inner wall of the dilution air interface 9 are threadedly rotated and sleeved with each other. The same fourth thread groove is also provided on the inner wall of the dilution air interface 9, and the fourth thread groove and the first thread groove 12 are threadedly rotated and connected with each other, so that the air collecting pipe 11 can be installed and the air collecting pipe 11 can be disassembled conveniently.

[0027] Example 2: Please refer to Figure 1 In combination with the basis of Example 1, a gun inner tube plug 8 is fixedly installed on the side of the gun inner tube 3. The gun inner tube plug 8 is fixedly installed on one end of the gun inner tube 3 to achieve the sealing of the gun inner tube 3 and prevent leakage. The end of the gun inner tube plug 8 away from the gun inner tube 3 is fixedly installed on the gun outer tube 2. The two ends of the gun inner tube plug 8 are connected to the gun inner tube 3 and the gun outer tube 2, which can achieve the fixing effect of the gun inner tube 3, prevent the position of the gun inner tube 3 from being offset, and ensure the fixing effect of the gun inner tube 3.

[0028] See also Figure 1 The end of the gun inner tube 3 is fixedly sleeved with the periphery of the central tube 4, and the other end of the central tube 4 is fixedly installed with a central tube plug 10; the gun outer tube 2 and the gun inner tube 3 have multiple holes on the leeward side of the high-temperature and high-dust flue gas, and the size of the diluted ammonia nozzle 5 is mutually compatible with the holes opened on the leeward side of the high-temperature and high-dust flue gas by the gun outer tube 2 and the gun inner tube 3, and they are fixedly sleeved with each other;

[0029] See also Figure 1 A high-temperature flue 1 is provided on the periphery of the gun outer tube 2, and the periphery of the high-temperature flue 1 and the periphery of the gun outer tube 2 are fixedly sleeved with each other. A mounting hole is opened on the side of the high-temperature flue 1, and the gun outer tube 2 is fixedly installed in the mounting hole. The side of the gun outer tube 2 and the periphery of the reducing agent solution pipe 7 are fixedly sleeved with each other. The reducing agent solution pipe 7 is arranged on the periphery of one end of the gun outer tube 2 away from the high-temperature flue 1, which can prevent the high temperature of the inner cavity of the high-temperature flue 1 from affecting the reducing agent solution pipe 7.

[0030] The working principle of the utility model is: when the device is needed, the device is first installed and fixed on the side of the high-temperature flue 1, and then connected to the reducing agent solution connecting pipe 7 through the outer pipe, so that the denitrification reducing agent solution can flow into the interlayer formed by the gun outer pipe 2 and the gun inner pipe 3. At this time, the high-temperature flue gas heats the solution in the interlayer to realize the vaporization process to produce high-concentration ammonia. The high-concentration ammonia is sprayed out through the central pipe 4 and the ammonia nozzle 6, and then connected to the dust prevention mechanism at the dilution powder interface. First, the air inlet pipe 13 is connected Next, when the diluted air enters the inner cavity of the air collecting pipe 11 through the air inlet pipe 13, it can be discharged through the air outlet 15 provided on the turntable 14. Since the turntable 14 is provided with the air outlet, the impurity particles in the diluted air can be blocked to prevent dust and impurities from entering the gun outer tube 2 and the gun inner tube 3, and to prevent the impurities and dust from clogging the diluted ammonia nozzle 5. When the diluted air enters the diluted ammonia nozzle 5 and the gun inner tube 3 and is mixed, it will be sprayed out of the gun outer tube 2, and then enter the inner cavity of the high-temperature flue 1 of the high-temperature and high-dust flue gas;

[0031] When it is necessary to clean the dust and impurities in the inner cavity of the dustproof mechanism, first, the air collecting pipe 11 can be taken out in a forward spiral to keep it away from the dilution air interface 9, and then the fixing rod 16 can be held tightly and rotated, and the rotation of the fixing rod 16 can drive the turntable 14 to rotate. When the turntable 14 is rotated under force, it will spiral out of the side of the air collecting pipe 11. When the turntable 14 is away from the air collecting pipe 11, one end of the air collecting pipe 11 is in an open state. At this time, the dust and impurities in the inner cavity of the air collecting pipe 11 can be cleaned, thereby cleaning the inner cavity of the dustproof mechanism and ensuring the filtering and dustproof effect of the dustproof mechanism on the device. After cleaning, the fixing rod 16 can be grasped again and rotated in the reverse direction, thereby driving the turntable 14 to rotate in the reverse direction, so that the second thread groove 17 can be spirally connected with the third thread groove 18. Since the second thread groove 17 and the third thread groove 18 are threadedly connected to each other, the contact gap between the turntable 14 and the air collecting pipe 11 can be minimized, and the dilution and dispersion of the diluted air can be prevented, thereby ensuring the dilution effect of the diluted air. Then the air collecting pipe 11 is spirally reversed into the dilution air interface 9 again, thereby completing the installation and disassembly of the dustproof mechanism.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A flue gas heat exchange ammonia evaporation spray gun, comprising a gun outer tube (2), characterized in that: The inner cavity of the gun outer tube (2) is provided with a gun inner tube (3), and the inner cavity of the gun inner tube (3) is provided with a central tube (4), and the side of the central tube (4) is fixedly sleeved with a plurality of ammonia nozzles (6), and the side of the ammonia nozzle (6) is fixedly sleeved with a dilution ammonia nozzle (5), and one end of the gun outer tube (2) is provided with a dilution air interface (9), and the inner cavity of the dilution air interface (9) is installed with a dustproof mechanism, and the side of the gun outer tube (2) is provided with a reducing agent solution connection pipe (7); The dust prevention mechanism comprises an air collecting pipe (11), one end of which is fixedly sleeved with an air inlet pipe (13), the other end of which is provided with a rotating disk (14), the side of which is fixedly connected with a fixing rod (16), and the side of which is provided with a plurality of air outlets (15).

2. The ammonia evaporation spray gun for flue gas heat exchange according to claim 1, characterized in that: A second thread groove (17) is provided on the periphery of the rotating disk (14), and a third thread groove (18) is provided on the inner wall of one end of the air collecting pipe (11) close to the rotating disk (14), and the second thread groove (17) and the third thread groove (18) are threadedly connected to each other.

3. The ammonia evaporation spray gun for flue gas heat exchange according to claim 1, characterized in that: A first thread groove (12) is provided on the periphery of the air collecting pipe (11), and the first thread groove (12) and the inner wall of the dilution air interface (9) are threadably sleeved with each other.

4. The ammonia evaporation spray gun for flue gas heat exchange according to claim 1, characterized in that: A gun inner tube plug (8) is fixedly mounted on the side of the gun inner tube (3), and one end of the gun inner tube plug (8) away from the gun inner tube (3) is fixedly mounted on the gun outer tube (2).

5. The ammonia evaporation spray gun for flue gas heat exchange according to claim 1, characterized in that: The end of the gun inner tube (3) is fixedly sleeved with the periphery of the central tube (4), and the other end of the central tube (4) is fixedly mounted with a central tube plug (10).

6. The ammonia evaporation spray gun for flue gas heat exchange according to claim 1, characterized in that: A high-temperature flue (1) is provided on the periphery of the gun outer tube (2); the periphery of the high-temperature flue (1) and the periphery of the gun outer tube (2) are fixedly sleeved together; and the side of the gun outer tube (2) and the periphery of the reducing agent solution pipe (7) are fixedly sleeved together.

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