Ammonia production device and ammonia production method for flue gas denitrification of brick kiln

Abstract

The invention provides an ammonia production device and an ammonia production method for flue gas denitrification of a brick kiln. A recovery box is used for recovering solutions in a reaction tank and a condensation pipe and injecting the solutions into the reaction tank again after treatment; the gas adjusting mechanism comprises a dust removal tank and a dilution fan, and the dilution fan is used for extracting air from a specific gas source and conveying the air into the dust removal tank for dust removal treatment; the denitration executing mechanism comprises a gas mixing cylinder and a plurality of spray guns arranged in the brick kiln, the gas mixing cylinder is used for mixing the ammonia gas mixture and the dedusted air according to a preset proportion to obtain mixed gas, and the spray guns are used for spraying the mixed gas into the brick kiln to conduct denitration treatment on flue gas generated in the brick kiln. The problems that the reaction efficiency is reduced and the ammonia escape rate is high due to the fact that an existing flue gas denitration device is large in spray gun atomization particle size range and lacks an effective recovery or secondary utilization mechanism for unreacted ammonia are solved.

Description

Technical Field

[0001] This invention belongs to the field of flue gas denitrification and ammonia production technology, and specifically relates to an ammonia production device and method for denitrification of flue gas in brick kilns. Background Technology

[0002] Flue gas denitrification for ammonia production is a technical process that removes nitrogen oxides from flue gas and simultaneously or subsequently produces ammonia through a specific process, aiming to reduce air pollution and realize the recycling of ammonia resources.

[0003] For example, the adaptive high-efficiency SNCR process apparatus disclosed in patent number CN111603920B includes a reaction tower, a heat exchange device, a fan, an ammonia tank, a first pipeline, and a second pipeline. The end of the first pipeline furthest from the ammonia supply pump branches into two sub-pipes, namely a first sub-pipe and a second sub-pipe. A first metering and distributing device is connected to the first sub-pipe, and a primary spray gun is connected to its distal end, positioned above the primary heat exchange device. A second metering and distributing device is connected to the second sub-pipe, and a secondary spray gun is connected to its distal end, positioned above the secondary heat exchange device. A first temperature sensor is installed at the lower end of the primary heat exchange device, a second temperature sensor at the lower end of the secondary heat exchange device, a third temperature sensor at the lower end of the tertiary heat exchange device, and a fourth temperature sensor at the upper end of the tertiary heat exchange device. However, the above patent still has the following application defects:

[0004] On the one hand, the spray guns in the aforementioned patents have a wide atomization particle size range, and are prone to problems such as uneven droplet size and incomplete evaporation. This affects the thorough mixing of ammonia and nitrogen oxides, reducing reaction efficiency.

[0005] On the other hand, although the aforementioned patents reduce the ammonia-nitrogen ratio through staged spraying, they lack an effective mechanism for the recovery or reuse of unreacted ammonia, which can easily lead to ammonia escape, resulting in secondary pollution and resource waste.

[0006] Therefore, how to design an ammonia production device for flue gas denitrification that can improve reaction efficiency and achieve precise control of ammonia slip rate has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to solve the problems of reduced reaction efficiency and high ammonia escape rate in existing flue gas denitrification devices due to the large atomization particle size range of the spray gun and the lack of an effective mechanism for the recovery or secondary utilization of unreacted ammonia.

[0008] To achieve the above objectives, the present invention provides an ammonia production device and ammonia production method for denitrification of flue gas in brick kilns.

[0009] According to a first aspect of the present invention, an ammonia generation device for denitrification of brick kiln flue gas is provided, comprising: an ammonia generation mechanism, a gas regulating mechanism, and a denitrification actuator;

[0010] The ammonia production unit includes a reaction tank, a condenser, and a recovery tank. The reaction tank generates a product gas containing ammonia after the ammonia production solution is injected. The condenser is used to condense the product gas to obtain a pre-purified ammonia mixture. The recovery tank is used to recover the solution in the reaction tank and the condenser and then re-inject it into the reaction tank after processing.

[0011] The gas conditioning system includes a dust collection tank and a dilution fan. The dilution fan is used to draw air from a specific gas source and deliver it to the dust collection tank for dust removal.

[0012] The denitrification actuator includes a gas mixing cylinder and several spray guns installed inside the brick kiln. The gas mixing cylinder is used to mix the ammonia mixture and the dust-removed air according to a preset ratio to obtain a mixed gas. The spray guns are used to spray the mixed gas into the interior of the brick kiln to denitrify the flue gas generated inside the brick kiln.

[0013] Optionally, the ammonia production mechanism also includes a dissolving tank, which is equipped with a feeding pipe for feeding ammonia granules.

[0014] Optionally, the dissolving tank is provided with a conical filter layer, and an axially rotatable grinding frame is provided above the conical filter layer. The grinding frame is used to crush and agitate the ammonia particles.

[0015] Optionally, the reaction vessel is equipped with a first temperature sensor and a first pressure sensor. The output terminal of the first temperature sensor is equipped with a first temperature indicator for reflecting the temperature value inside the reaction vessel, and the output terminal of the first pressure sensor is equipped with a first pressure indicator for reflecting the pressure value inside the reaction vessel.

[0016] Optionally, the reaction vessel is provided with a rotating drive rod, on which several solution agitation components for agitating the ammonia production solution are arranged alternately.

[0017] Optionally, each of the several solution agitation assemblies includes a connecting seat and a rotating rod. One side of the connecting seat is connected to a drive rod, and the other side has a limiting groove. One end of the rotating rod is axially rotatably connected to the limiting groove, and the other end is connected to an agitator plate having several through holes.

[0018] Optionally, the recovery tank is provided with a filter layer and an adsorption layer for treating the solution returned to the recovery tank.

[0019] Optionally, the recovery tank is equipped with a concentration sensor for detecting the ammonia concentration of the recovery solution.

[0020] Alternatively, each of the spray guns may include an eighth air supply pipe with a plurality of air outlets, and a spiral diverter plate on each of the air outlets, the spiral diverter plate having a diverter groove capable of diverting and guiding the mixed gas sprayed from the plurality of air outlets.

[0021] According to a second aspect of the present invention, a method for producing ammonia for denitrification of brick kiln flue gas is also provided, applied to the ammonia production apparatus for denitrification of brick kiln flue gas as described in any of the preceding claims, the ammonia production method comprising:

[0022] Ammonia-producing solution is injected into the reaction vessel to generate product gas containing ammonia.

[0023] The product gas is passed into a condenser for condensation to obtain a pre-purified ammonia mixture.

[0024] The solution in the reaction vessel and condenser is recovered through a recovery tank and then re-injected into the reaction vessel after processing.

[0025] Air is drawn from a specific air source by a dilution fan and transported to a dust collection tank for dust removal.

[0026] The ammonia mixture and the dust-removed air are mixed in a preset ratio using a gas mixing cylinder to obtain a mixed gas.

[0027] The mixed gas is sprayed into the interior of the brick kiln through several spray guns to denitrify the flue gas generated inside the kiln.

[0028] The beneficial effects of this invention are as follows:

[0029] The ammonia generation device for denitrification of brick kiln flue gas proposed in this invention includes an ammonia generation mechanism that injects an ammonia-containing solution into a reaction tank to generate a product gas containing ammonia. The product gas is then condensed through a condenser to obtain a pre-purified ammonia mixture. A recovery tank can be used to recover the solution in the reaction tank and condenser and re-inject it into the reaction tank after processing. A gas regulation mechanism is also included, which uses a dilution fan to draw air from a specific gas source and deliver it to a dust removal tank for dust removal. Furthermore, a denitrification actuator is included, which uses a gas mixing cylinder to mix the ammonia mixture and the dust-removed air according to a preset ratio to obtain a mixed gas. This mixed gas is then sprayed into the interior of the brick kiln through several spray guns to denitrify the flue gas generated inside the brick kiln. Compared with existing flue gas denitrification devices, this invention has significant advancements: On the one hand, this invention abandons the denitrification method of spray gun atomization, and instead uses an ammonia solution to form an ammonia mixture, which is then mixed with air to form a mixed gas. This mixed gas is then used for jet denitrification inside the brick kiln, thereby enabling the mixed gas to fully mix with the nitrogen oxides in the flue gas, thus improving reaction efficiency. On the other hand, this invention uses a recovery box to achieve effective recovery and reuse of the ammonia solution, thereby reducing pollution and denitrification costs, and achieving rational utilization of resources.

[0030] Furthermore, by setting a conical filter layer and a grinding frame in the dissolving tank, the present invention can reduce the movement space of the ammonia-producing particles, thereby increasing the contact probability between the ammonia-producing particles and the grinding frame, and thus significantly improving the preparation efficiency of the ammonia solution.

[0031] Furthermore, the present invention applies multi-directional shear force to the ammonia production solution by setting a drive rod and several solution agitation components, forming three-dimensional flow patterns such as vortex and turbulence, thereby enhancing the pyrolysis efficiency of the ammonia production solution.

[0032] The ammonia production method for denitrification of brick kiln flue gas proposed in this invention belongs to the same general inventive concept as the ammonia production device for denitrification of brick kiln flue gas of this invention. It should at least have the same technical effects as the ammonia production device for denitrification of brick kiln flue gas of this invention. This invention will not elaborate further here.

[0033] As can be seen from the above, the technical solution of the present invention can effectively solve the problems of reduced reaction efficiency and high ammonia escape rate in existing flue gas denitrification devices due to the large atomization particle size range of the spray gun and the lack of an effective recovery or secondary utilization mechanism for unreacted ammonia.

[0034] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0035] The present invention can be better understood by referring to the following description taken in conjunction with the accompanying drawings, in which the same or similar reference numerals are used throughout the drawings to denote the same or similar parts.

[0036] Figure 1 A schematic diagram of an ammonia production device for denitrification of brick kiln flue gas is shown from a first perspective according to an embodiment of the present invention.

[0037] Figure 2 A schematic diagram of an ammonia production device for denitrification of brick kiln flue gas is shown from a second perspective according to an embodiment of the present invention.

[0038] Figure 3 A schematic diagram of the circuit structure of an ammonia production device for denitrification of brick kiln flue gas according to an embodiment of the present invention is shown.

[0039] Figure 4 A cross-sectional view of a dissolving tank according to an embodiment of the present invention is shown;

[0040] Figure 5 A cross-sectional view of a reaction vessel according to an embodiment of the present invention is shown;

[0041] Figure 6 A cross-sectional view of a solution agitation assembly according to an embodiment of the present invention is shown;

[0042] Figure 7 A cross-sectional view of a recycling bin according to an embodiment of the present invention is shown;

[0043] Figure 8 A schematic diagram of the structure of a spray gun according to an embodiment of the present invention is shown;

[0044] Figure 9 A schematic flow diagram of an ammonia production method for denitrification of brick kiln flue gas according to an embodiment of the present invention is shown.

[0045] Figure label:

[0046] 1-Reaction vessel; 2-Condenser; 3-Recovery box; 301-Concentration sensor; 4-Dust collector; 5-Dilution fan; 6-Gas mixing cylinder; 7-Spray gun; 8-Dissolving tank; 9-Feeding pipe; 10-Conical filter layer; 11-Grinding frame; 1101-Grinding block; 12-First motor; 13-First infusion pipe; 14-First metering pump; 15-First outlet pump; 16-Heating jacket; 17-Heating wire; 18-First temperature sensor; 19-First pressure sensor; 20-First temperature indicator; 21-First pressure indicator; 22-Drive rod; 23-Connecting seat; 2301-Limiting groove; 24-Rotating rod; 25-Stirring plate; 2501-Through hole; 2502-Curved surface; 26-Second motor; 27-Second outlet pump; 2 8-Gas-liquid separator; 29-First gas delivery pipe; 30-First vacuum pump; 31-Third liquid discharge pump; 32-Support; 33-Second gas delivery pipe; 34-Second vacuum pump; 35-Second temperature indicator; 36-Second pressure indicator; 37-Fourth liquid discharge pump; 38-Second liquid delivery pipe; 39-Third liquid delivery pipe; 40-Filter layer; 41-Adsorption layer; 42-Second metering pump; 43-Third gas delivery pipe; 44-Fourth gas delivery pipe; 45-Fifth gas delivery pipe; 46-Third vacuum pump; 47-Sixth gas delivery pipe; 48-Fourth vacuum pump; 49-Third temperature indicator; 50-Third pressure indicator; 51-Seventh gas delivery pipe; 52-Eighth gas delivery pipe; 5201-Gas outlet; 53-Spiral diverter; 5301-Diverter groove. Detailed Implementation

[0047] To enable those skilled in the art to more fully understand the technical solutions of the present invention, exemplary embodiments of the present invention will be described more comprehensively and in detail below with reference to the accompanying drawings. Obviously, the one or more embodiments of the present invention described below are merely one or more specific ways to implement the technical solutions of the present invention, and are not exhaustive. It should be understood that other ways belonging to a general inventive concept can be used to implement the technical solutions of the present invention, and should not be limited to the embodiments described exemplary. Based on one or more embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0048] Reference Figure 1-8 An embodiment of the present invention provides an ammonia generation device for denitrification of brick kiln flue gas, comprising: an ammonia generation mechanism, a gas regulating mechanism, and a denitrification execution mechanism;

[0049] The ammonia production unit includes a reaction tank 1, a condenser 2, and a recovery tank 3. The reaction tank 1 can generate a product gas containing ammonia after the ammonia production solution is injected. The condenser 2 is used to condense the product gas to obtain a pre-purified ammonia mixture. The recovery tank 3 is used to recover the solution in the reaction tank 1 and the condenser 2 and re-inject it into the reaction tank 1 after processing.

[0050] The gas conditioning mechanism includes a dust collection tank 4 and a dilution fan 5. The dilution fan 5 is used to draw air from a specific gas source and deliver it to the dust collection tank 4 for dust removal.

[0051] The denitrification actuator includes a gas mixing cylinder 6 and several spray guns 7 installed inside the brick kiln. The gas mixing cylinder 6 is used to mix the ammonia mixture and the dust-removed air according to a preset ratio to obtain a mixed gas. The several spray guns 7 are used to spray the mixed gas into the interior of the brick kiln to denitrify the flue gas generated inside the brick kiln.

[0052] In one embodiment, the ammonia generation mechanism further includes a dissolving tank 8, which is equipped with a feeding pipe 9 for discharging ammonia-generating particles. Specifically, the ammonia-generating particles are polymeric ammonia-generating particles composed of urea polymeric composite materials, modified starch-based ammonia-generating carriers, or hydrolyzed polyacrylic acid polymers as the matrix. They can form an ammonia-generating solution after dissolving in water and can generate ammonia gas through the reaction tank 1 to achieve the supply of ammonia source for flue gas denitrification.

[0053] In one embodiment, a conical filter layer 10 is provided inside the dissolving tank 8, and an axially rotatable grinding frame 11 is provided above the conical filter layer 10. The grinding frame 11 is used to crush and agitate the ammonia particles.

[0054] In one specific embodiment, the lower end of the grinding frame 11 is provided with grinding blocks 1101 for crushing and pulverizing ammonia particles.

[0055] Specifically, the grinding frame 11 is herringbone shaped. When it rotates above the conical filter layer 10, it can crush the ammonia-producing particles between them using the grinding blocks 1101. At the same time, it can also agitate the aqueous solution to accelerate the dissolution of the ammonia-producing particles. Furthermore, the conical filter layer 10 can reduce the movement space of the ammonia-producing particles, thereby increasing the contact probability between the ammonia-producing particles and the grinding frame 11, thus significantly improving the preparation efficiency of the ammonia solution.

[0056] In one specific embodiment, the upper end of the mill frame 11 is connected to a first motor 12 for driving its rotation.

[0057] In one embodiment, a first infusion pipe 13 is provided at the lower end of the dissolving tank 8, and a first metering pump 14 is provided on the first infusion pipe 13. The first metering pump 14 can draw the ammonia-generating solution in the dissolving tank 8 into the reaction tank 1 through the first infusion pipe 13 at a preset flow rate. Specifically, the first metering pump 14 is composed of a drive motor, an eccentric wheel transmission mechanism, a diaphragm assembly, a one-way valve, and a flow regulating assembly. It drives the eccentric wheel to rotate through the drive motor, which drives the plunger or diaphragm to reciprocate. In conjunction with the opening and closing of the inlet and outlet one-way valves, it realizes the liquid intake and discharge. The flow rate accuracy is controlled by adjusting the stroke or speed to ensure the quantitative delivery of the ammonia-generating solution.

[0058] In one embodiment, a first liquid outlet pump 15 is provided at the lower end of the dissolving tank 8. The first liquid outlet pump 15 is used to regulate the output or input of liquid in the dissolving tank 8. Specifically, the first liquid outlet valve 15 is a bidirectional gear pump, which can change the delivery direction by changing the gear meshing direction to realize the output or input of liquid.

[0059] In one embodiment, a heating jacket 16 is provided inside the reaction vessel 1, and a plurality of heating wires 17 are arranged inside the heating jacket 16. The heating wires 17 are configured to generate heat after being energized, so as to pyrolyze the ammonia production solution to generate product gas.

[0060] In one embodiment, a first temperature sensor 18 and a first pressure sensor 19 are installed inside the reaction vessel 1. The output terminal of the first temperature sensor 18 is equipped with a first temperature indicator 20 to reflect the temperature value inside the reaction vessel 1, and the output terminal of the first pressure sensor 19 is equipped with a first pressure indicator 21 to reflect the pressure value inside the reaction vessel 1. Specifically, the installation of the first temperature sensor 18 and the first pressure sensor 19 in the reaction vessel 1 allows for real-time monitoring of the thermodynamic and mechanical parameters of the reaction system inside the vessel. The first temperature indicator 20 and the first pressure indicator 21 can visually display the temperature and pressure values. Together, they provide real-time feedback of key process parameters to the operator, ensuring that the reaction proceeds efficiently within safe thresholds and preventing safety accidents caused by over-temperature and over-pressure.

[0061] In one embodiment, a rotating drive rod 22 is installed inside the reaction vessel 1, and several solution stirring components for stirring the ammonia production solution are arranged alternately on the drive rod 22.

[0062] In one specific embodiment, each of the plurality of solution agitation assemblies includes a connecting seat 23 and a rotating rod 24. One side of the connecting seat 23 is connected to the drive rod 22, and the other side has a limiting groove 2301. One end of the rotating rod 24 is axially rotatably connected to the limiting groove 2301, and the other end is connected to an agitation plate 25 having a plurality of through holes 2501.

[0063] In one specific embodiment, a second motor 26 for driving the drive rod 8 is provided at the upper end of the reaction vessel 1.

[0064] In one specific embodiment, the stirring plate 25 has a curved surface 2502 for contacting the ammonia solution.

[0065] Specifically, when the stirring plate 25 rotates circumferentially and rotates on its own axis under the action of the driving rod 22 and the rotating rod 24, its curved surface generates a more complex flow field after contacting the ammonia production solution. It can apply multi-directional shear force to the ammonia production solution, forming three-dimensional flow modes such as vortex and turbulence. At the same time, the curvature change of the edge of the stirring plate 25 can form a local pressure gradient, and several through holes 2501 can increase the liquid flow amplitude to enhance the pyrolysis efficiency of the ammonia production solution.

[0066] In one embodiment, a second liquid discharge pump 27 is provided at the lower end of the reaction vessel 1. The second liquid discharge pump 27 is used to regulate the output of liquid in the reaction vessel 1.

[0067] In one embodiment, the ammonia production unit further includes a gas-liquid separator 28 for separating the product gas and the residual ammonia production solution.

[0068] In one embodiment, a first gas delivery pipe 29 is provided on the gas-liquid separator 28, and a first vacuum pump 30 is provided on the first gas delivery pipe 29. The first vacuum pump 30 can extract the product gas generated in the reaction tank 1 into the gas-liquid separator 28 through the first gas delivery pipe 29.

[0069] Specifically, because the product gas still contains droplets or atomized particles, the gas-liquid separator 28 utilizes a built-in wire mesh demister and cyclone separation structure to achieve efficient gas-liquid separation based on inertial collision, centrifugal separation, or density difference principles. This ensures that the purity of the discharged gas meets standards and prevents liquid substances from affecting the ammonia production operation, thereby guaranteeing the stable operation of the ammonia production unit. The specific structure and working principle of the gas-liquid separator 28 are existing technologies, and will not be described in detail here.

[0070] In one embodiment, a third liquid discharge pump 31 is provided at the lower end of the gas-liquid separator 28, which is used to regulate the output of liquid in the gas-liquid separator 28.

[0071] In one embodiment, the ammonia production mechanism further includes a support 32, on which the reaction tank 1, the dissolving tank 8, and the gas-liquid separator 28 are all mounted.

[0072] In one embodiment, a second gas delivery pipe 33 is provided on the condenser tube 2, and a second suction pump 34 is provided on the second gas delivery pipe 33. The second suction pump 34 can draw the separated product gas from the gas-liquid separator 28 into the condenser tube 2 through the second gas delivery pipe 33. Specifically, the condenser tube 2 increases the heat exchange area through an inner wall spiral coil or tube structure, and uses a low-temperature cooling medium to exchange heat with the high-temperature product gas, causing water vapor to condense into liquid due to the temperature reduction, thereby removing moisture from the product gas. This works in conjunction with the gas-liquid separator 28 to achieve efficient gas purification, further preventing liquid substances from affecting subsequent processing equipment. The specific structure and working principle of the condenser tube 2 are existing technologies, and will not be described in detail here.

[0073] In one embodiment, the condenser tube 2 is provided with a second temperature indicator 35 for reflecting the temperature value inside and a second pressure indicator 36 for reflecting the pressure value inside.

[0074] In one embodiment, a fourth liquid outlet pump 37 is provided at the lower end of the condenser tube 2, which is used to regulate the output of liquid in the condenser tube 2.

[0075] In one embodiment, the recovery tank 3 is provided with a second infusion pipe 38 connected to the first dispensing pump 15. Specifically, the first dispensing pump 15 can input the solution in the recovery tank 3 into the dissolving tank 8 through the second infusion pipe 38, or output the solution in the dissolving tank 8 into the recovery tank 3, so as to facilitate the reuse and discharge of the solution.

[0076] In one embodiment, the recovery tank 3 is provided with a third liquid delivery pipe 39 connected to the second liquid delivery pump 27, the third liquid delivery pump 31 and the fourth liquid delivery pump 37, so as to recover the residual solution in the reaction tank 1, the gas-liquid separator 28 and the condenser 2.

[0077] In one embodiment, the recovery tank 3 is provided with a filter layer 40 and an adsorption layer 41 for treating the solution returned to the recovery tank 3.

[0078] Specifically, the adsorption layer 41 is filled with activated carbon. The recovery tank 3 can use the filter layer 40 to intercept solid impurities in the recovery solution, and the adsorption layer 41 to adsorb organic matter and trace amounts of ammonia, thereby purifying and recovering the residual solution in the reaction tank 1, gas-liquid separator 28, and condenser 2. This recovery operation can reduce the waste of chemical raw materials, lower wastewater discharge costs, and the recovered ammonia solution can be recycled for the ammonia production process, ensuring the continuity of the flue gas denitrification process and reducing overall operating costs.

[0079] In addition, the recycling bin 3 is provided with a removable opening (not shown in the figure) for replacing the filter layer 40 and the adsorption layer 41 and for removing impurities inside the bin, so as to facilitate maintenance operations of the recycling bin 3.

[0080] In one embodiment, the recovery tank 3 is equipped with a concentration sensor 301 for detecting the ammonia concentration in the recovery solution. Specifically, the concentration sensor 301 can monitor the changes in ammonia concentration in the recovery solution in real time, providing operators with accurate data to adjust the solution dilution ratio, avoiding the impact of excessively high or low concentrations on recycling efficiency, thereby ensuring the stability of the recovery solution, optimizing resource utilization, and reducing operating costs, thus improving the accuracy of the flue gas denitrification process.

[0081] In one embodiment, the recovery tank 3 is equipped with a second metering pump 42 for discharging the solution inside or pumping in external solutions. The second metering pump 42 facilitates the discharge of unusable solutions from the dissolving tank 8 or the recovery tank 3 to avoid chemical contamination and other issues, thereby ensuring the ammonia production effect.

[0082] In one embodiment, the dust collection tank 4 is provided with a third air supply pipe 43 that is connected to the dilution fan 5.

[0083] In one specific embodiment, a fourth gas supply pipe 44 is connected to the dilution blower 5, and the other end of the fourth gas supply pipe 44 extends to the outlet end of the brick kiln.

[0084] Specifically, the dilution fan 5 draws air from the external environment to introduce a clean and controllable air source. After being purified by the dust collector 4, the air is sent to the brick kiln outlet to mix with the flue gas, thereby reducing the flue gas temperature, diluting the pollutant concentration, and optimizing the subsequent denitrification conditions. The mixed gas then passes through the dust collector 4 to remove secondary entrained particles and is finally sent to the gas mixing cylinder 6 to ensure that ammonia and clean air are mixed evenly in a preset ratio, thereby improving the flue gas denitrification efficiency and preventing the device from corroding or clogging.

[0085] Furthermore, both the dilution fan 5 and the dust collection tank 4 are existing technologies, such as dilution air fans and cyclone dust collectors, and will not be described in detail here.

[0086] In one embodiment, a fifth gas supply pipe 45 connected to the condenser pipe 2 is provided on the gas mixing cylinder 6, and a third gas pump 46 is provided on the fifth gas supply pipe 45.

[0087] In one embodiment, a sixth gas supply pipe 47 connected to a dust removal tank 4 is provided on the gas mixing cylinder 6, and a fourth air pump 48 is provided on the sixth gas supply pipe 47.

[0088] Specifically, the fifth gas supply pipe 45 and the sixth gas supply pipe 47 are respectively connected to the two ends of the gas mixing cylinder 6. The gas mixing cylinder 6 achieves uniform mixing of ammonia and clean air through a static mixing element or a dynamic stirring mechanism. Based on gas diffusion and turbulent shearing, it ensures that the ammonia concentration is distributed within a safe threshold, providing a stable ratio of reducing agent for the denitrification of flue gas in brick kilns, and effectively preventing local ammonia escape or insufficient reaction. The specific structure and working principle of the gas mixing cylinder 6 are existing technologies, such as ammonia / air mixers, and will not be described in detail here.

[0089] In one embodiment, the gas mixing cylinder 6 is provided with a third temperature indicator 49 for reflecting the temperature value inside and a third pressure indicator 50 for reflecting the pressure value inside.

[0090] In one embodiment, a seventh gas delivery pipe 51 is provided on the gas mixing cylinder 6, and the other end of the seventh gas delivery pipe 51 is connected to a plurality of spray guns 7.

[0091] Specifically, several spray guns 7 are arranged at the inlet end of the brick kiln. By spraying ammonia gas into the mainstream flue gas zone inside the kiln, ammonia gas reacts rapidly with nitrogen oxides in the flue gas at high temperature. This high temperature promotes a non-catalytic reduction reaction, allowing nitrogen oxides to be efficiently reduced to nitrogen and water in the preheating section of the brick kiln, thus achieving denitrification of the flue gas. Furthermore, the arrangement of several spray guns at the inlet end of the brick kiln shortens the reaction path, improves denitrification efficiency, and prevents ammonia gas from escaping or corroding equipment in the low-temperature section, ensuring the economic efficiency and environmental friendliness of the ammonia production unit.

[0092] Furthermore, some spray guns 7 are powered by compressed air or high-pressure pumps, which is existing technology and will not be described in detail here.

[0093] In one embodiment, each of the plurality of spray guns 7 includes an eighth gas supply pipe 52, which is provided with a plurality of gas outlets 5201. A spiral flow divider 53 is provided on each of the gas outlets 5201, and the spiral flow divider 53 has a flow divider groove 5301 capable of dividing and guiding the mixed gas sprayed from the plurality of gas outlets 5201. Specifically, the spiral flow divider 5301 utilizes the tangential force and centrifugal force generated when the airflow passes through the spiral structure to divide the high-speed airflow into a rotating spiral flow field, transforming the originally unidirectional jet airflow into a three-dimensional diffusion cone or fan-shaped jet pattern. This significantly expands the coverage area, thereby improving spray uniformity, increasing the coverage area, and enhancing the edge atomization effect. It also prevents direct contact between the ammonia solution and the bricks in the brick kiln, thus preventing the formation of black deposits, ensuring the surface quality of the bricks, and better adapting to flue gas denitrification processes that require large-area uniform distribution.

[0094] In addition, the ammonia production device for denitrification of brick kiln flue gas of the present invention is also equipped with a control module, such as a host computer, for coordinating and controlling the ammonia production device.

[0095] The ammonia generation device for denitrification of brick kiln flue gas proposed in this invention includes an ammonia generation mechanism that injects an ammonia-containing solution into a reaction tank to generate a product gas containing ammonia. The product gas is then condensed through a condenser to obtain a pre-purified ammonia mixture. A recovery tank can be used to recover the solution in the reaction tank and condenser and re-inject it into the reaction tank after processing. A gas regulation mechanism is also included, which uses a dilution fan to draw air from a specific gas source and deliver it to a dust removal tank for dust removal. Furthermore, a denitrification actuator is included, which uses a gas mixing cylinder to mix the ammonia mixture and the dust-removed air according to a preset ratio to obtain a mixed gas. This mixed gas is then sprayed into the interior of the brick kiln through several spray guns to denitrify the flue gas generated inside the brick kiln. Compared with existing flue gas denitrification devices, this invention has significant advancements: On the one hand, this invention abandons the denitrification method of spray gun atomization, and instead uses an ammonia solution to form an ammonia mixture, which is then mixed with air to form a mixed gas. This mixed gas is then used for jet denitrification inside the brick kiln, thereby enabling the mixed gas to fully mix with the nitrogen oxides in the flue gas, thus improving reaction efficiency. On the other hand, this invention uses a recovery box to achieve effective recovery and reuse of the ammonia solution, thereby reducing pollution and denitrification costs, and achieving rational utilization of resources.

[0096] Furthermore, by setting a conical filter layer and a grinding frame in the dissolving tank, the present invention can reduce the movement space of the ammonia-producing particles, thereby increasing the contact probability between the ammonia-producing particles and the grinding frame, and thus significantly improving the preparation efficiency of the ammonia solution.

[0097] Furthermore, the present invention applies multi-directional shear force to the ammonia production solution by setting a drive rod and several solution agitation components, forming three-dimensional flow patterns such as vortex and turbulence, thereby enhancing the pyrolysis efficiency of the ammonia production solution.

[0098] Accordingly, such as Figure 9 As shown, embodiments of the present invention also provide a method for ammonia production for denitrification of brick kiln flue gas, applied to an ammonia production device for denitrification of brick kiln flue gas as described in any of the above embodiments. The ammonia production method includes the following steps:

[0099] Step S1: Inject ammonia-generating solution into reaction vessel 1 to generate product gas containing ammonia;

[0100] Step S2: The product gas is passed into condenser 2 for condensation treatment to obtain a pre-purified ammonia mixture;

[0101] Step S3: The solution in reaction vessel 1 and condenser 2 is recovered through recovery tank 3 and then injected back into reaction vessel 1 after processing;

[0102] Step S4: Air is drawn from a specific air source by the dilution fan 5 and transported to the dust collection tank 4 for dust removal.

[0103] Step S5: The ammonia mixture and the dust-removed air are mixed in a preset ratio through the gas mixing cylinder 6 to obtain a mixed gas;

[0104] Step S6: The mixed gas is sprayed into the interior of the brick kiln through several spray guns 7 to denitrify the flue gas generated inside the brick kiln.

[0105] In one embodiment, before injecting the ammonia-generating solution into the reaction tank 1 and generating a product gas containing ammonia in step S1, the method further includes:

[0106] Ammonia granules are fed into the dissolving tank 8 through the feeding pipe 9 at a feeding ratio of 1:1 or 1:1.25, and an aqueous solution is fed into the dissolving tank 8 through the first liquid discharge pump 15.

[0107] The ammonia particles are crushed and agitated by the grinding frame 11 and the conical filter layer 10 to form an ammonia solution with a mass concentration of 40-50%.

[0108] The ammonia-generating solution is drawn into the reaction tank 1 at a preset flow rate through the first infusion pipe 13 and the first metering pump 14.

[0109] In one embodiment, in step S1, an ammonia-generating solution is injected into reaction tank 1 to generate a product gas containing ammonia, specifically including:

[0110] The ammonia solution is heated to 180-200℃ using heating tube 16 and heating wire 17.

[0111] At the same time, the drive rod 22 and the agitator 25 are activated to agitate the ammonia solution to generate product gas containing ammonia.

[0112] Specifically, when the ammonia solution is heated, its polymer chains break down, generating a product gas containing ammonia, carbon dioxide, and water vapor.

[0113] In one embodiment, in step S2, the product gas is passed into condenser 2 for condensation to obtain a preliminarily purified ammonia mixture, specifically including:

[0114] The product gas generated in the reaction tank 1 is extracted into the gas-liquid separator 28 through the first gas supply pipe 29 and the first gas pump 30 for gas-liquid separation.

[0115] The separated product gas is drawn into the condenser 2 through the second gas delivery pipe 33 and the second suction pump 34 for condensation treatment to obtain a pre-purified ammonia mixture.

[0116] In one embodiment, in step S3, the solution in the reaction tank 1 and the condenser 2 is recovered through the recovery tank 3 and then re-injected into the reaction tank 1 after processing. Specifically, this includes:

[0117] The residual solution in the reaction tank 1, gas-liquid separator 28 and condenser 2 is recovered into the recovery tank 3 through the second liquid discharge pump 27, the third liquid discharge pump 31, the fourth liquid discharge pump 37 and the third liquid delivery pipe 39.

[0118] The solution is treated through filter layer 40 and adsorption layer 41;

[0119] The treated solution is injected into the dissolving tank 8 through the first discharge pump 15 and the second delivery pipe 38, and then injected back into the reaction tank 1 through the dissolving tank 8.

[0120] In one embodiment, in step S4, air is drawn from a specific air source by a dilution fan 5 and transported to a dust collection tank 4 for dust removal treatment, specifically including:

[0121] Air is drawn from the external environment by dilution fan 5, purified in dust collector 4, and then sent to the outlet of the brick kiln to mix with flue gas.

[0122] The mixed gas is then subjected to dust removal treatment in dust collector 4 to obtain clean air.

[0123] In one embodiment, in step S5, the ammonia mixture and the dust-removed air are mixed in a preset ratio using a gas mixing cylinder 6 to obtain a mixed gas, specifically including:

[0124] According to the preset ratio, the ammonia mixture in the condenser 2 is introduced into the gas mixing cylinder 6 through the fifth gas supply pipe 45 and the third gas pump 46;

[0125] Meanwhile, clean air from the dust collection tank 4 is introduced into the gas mixing cylinder 6 through the sixth gas supply pipe 47 and the fourth air pump 48 to obtain a mixed gas.

[0126] In one embodiment, in step S6, the mixed gas is sprayed into the interior of the brick kiln through several spray guns 7 to denitrify the flue gas generated inside the brick kiln, specifically including:

[0127] The mixed gas in the gas mixing cylinder 6 is introduced into the eighth gas supply pipe 52 of several spray guns 7 through the seventh gas supply pipe 51.

[0128] The mixed gas in the eighth gas pipe 52 is sprayed into the brick kiln through several gas outlets 5201, and is diverted and guided by the spiral diverter plate 53 and the diversion groove 5301 to denitrify the flue gas generated in the brick kiln.

[0129] The ammonia production method for denitrification of brick kiln flue gas proposed in this invention belongs to the same general inventive concept as the ammonia production device for denitrification of brick kiln flue gas of this invention. It should at least have the same technical effects as the ammonia production device for denitrification of brick kiln flue gas of this invention. This invention will not elaborate further here.

[0130] While one or more embodiments of the present invention have been described above, those skilled in the art will recognize that the present invention can be implemented in any other form without departing from its spirit and scope. Therefore, the embodiments described above are illustrative and not restrictive, and many modifications and substitutions will be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An ammonia production device for denitrification of brick kiln flue gas, characterized in that, include: Ammonia generation unit, gas regulation unit, and denitrification unit; The ammonia production unit includes a reaction tank, a condenser, and a recovery tank. The reaction tank generates a product gas containing ammonia after the ammonia production solution is injected. The condenser is used to condense the product gas to obtain a pre-purified ammonia mixture. The recovery tank is used to recover the solution in the reaction tank and the condenser and then re-inject it into the reaction tank after processing. The gas conditioning system includes a dust collection tank and a dilution fan. The dilution fan is used to draw air from a specific gas source and deliver it to the dust collection tank for dust removal. The denitrification actuator includes a gas mixing cylinder and several spray guns installed inside the brick kiln. The gas mixing cylinder is used to mix the ammonia mixture and the dust-removed air according to a preset ratio to obtain a mixed gas. The spray guns are used to spray the mixed gas into the interior of the brick kiln to denitrify the flue gas generated inside the brick kiln.

2. The ammonia production device for denitrification of brick kiln flue gas according to claim 1, characterized in that, The ammonia production mechanism also includes a dissolving tank, which is equipped with a feeding pipe for adding ammonia granules.

3. The ammonia production device for denitrification of brick kiln flue gas according to claim 2, characterized in that, The dissolving tank is equipped with a conical filter layer, and an axially rotatable grinding frame is installed above the conical filter layer. The grinding frame is used to crush and agitate the ammonia particles.

4. The ammonia production device for denitrification of brick kiln flue gas according to claim 3, characterized in that, The reaction vessel is equipped with a first temperature sensor and a first pressure sensor. The output terminal of the first temperature sensor is equipped with a first temperature indicator for reflecting the temperature value inside the reaction vessel, and the output terminal of the first pressure sensor is equipped with a first pressure indicator for reflecting the pressure value inside the reaction vessel.

5. The ammonia production device for denitrification of brick kiln flue gas according to claim 4, characterized in that, The reaction vessel is equipped with a rotating drive rod, on which several solution agitation components for stirring the ammonia production solution are arranged alternately.

6. The ammonia production device for denitrification of brick kiln flue gas according to claim 5, characterized in that, Each of the aforementioned solution agitation assemblies includes a connecting seat and a rotating rod. One side of the connecting seat is connected to a drive rod, and the other side has a limiting groove. One end of the rotating rod is axially rotatably connected to the limiting groove, and the other end is connected to an agitator plate having several through holes.

7. The ammonia production device for denitrification of brick kiln flue gas according to claim 6, characterized in that, The recovery tank is equipped with a filter layer and an adsorption layer for treating the solution returned to the recovery tank.

8. The ammonia production device for denitrification of brick kiln flue gas according to claim 7, characterized in that, The recovery tank is equipped with a concentration sensor for detecting the ammonia concentration in the recovery solution.

9. The ammonia production device for denitrification of brick kiln flue gas according to claim 8, characterized in that, Each of the several spray guns includes an eighth air supply pipe, which is provided with several air outlets. Each air outlet is provided with a spiral flow divider, which has a flow divider groove capable of dividing and guiding the mixed gas sprayed from the several air outlets.

10. A method for producing ammonia for denitrification of brick kiln flue gas, characterized in that, The ammonia production device for denitrification of brick kiln flue gas, as described in any one of claims 1-9, comprises: Ammonia-producing solution is injected into the reaction vessel to generate product gas containing ammonia. The product gas is passed into a condenser for condensation to obtain a pre-purified ammonia mixture. The solution in the reaction vessel and condenser is recovered through a recovery tank and then re-injected into the reaction vessel after processing. Air is drawn from a specific air source by a dilution fan and transported to a dust collection tank for dust removal. The ammonia mixture and the dust-removed air are mixed in a preset ratio using a gas mixing cylinder to obtain a mixed gas. The mixed gas is sprayed into the interior of the brick kiln through several spray guns to denitrify the flue gas generated inside the kiln.

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