Ammonia water spray gun for ultralow emission

Abstract

An ammonia water spray gun for ultralow emission comprises a nozzle, a first gun barrel, a connecting bayonet, a second gun barrel and a fixed mounting sleeve which are axially connected in sequence, the fixed mounting sleeve is fixed on a decomposing furnace and used for supporting the first gun barrel, a fluid inlet end of the second gun barrel is connected with a first branch pipe, and the second gun barrel at the downstream of the first branch pipe is connected with a second branch pipe; the nozzle is detachably connected with the first gun barrel, and a filtering piece and a sealing piece are arranged at the connecting end; a flowmeter and a pressure sensor are arranged on the second gun barrel, the flowmeter is located on the upstream of the second branch pipe, the pressure sensor is located on the downstream of the second branch pipe, and the flowmeter and the pressure sensor are both in communication connection with the control unit. The nozzle blockage can be effectively reduced, the atomization efficiency is improved, the denitration efficiency is further improved, and the nitrogen oxide emission of the cement kiln decomposing furnace is reduced.

Description

Technical Field

[0001] This utility model relates to the field of denitrification technology in cement kilns, specifically to an ammonia spray gun for ultra-low emissions. Background Technology

[0002] The low-ammonia denitrification technology upgrade mainly optimizes processes such as pulverized coal combustion in the decomposer, tertiary air ducts, and C4 feed pipes. Under the condition of not affecting cement firing, it rationally controls the amount of coal used at the kiln head and kiln tail, and adopts high-intensity reduction combustion control technology in the decomposer to generate a strong reduction zone in the cone part of the decomposer. The reducing agents such as CO, CH4, and HCN generated by the oxygen-deficient combustion of pulverized coal in the reduction zone react with the thermal NOx in the flue gas at the kiln head to generate pollution-free inert gas N2.

[0003] The high-efficiency SNCR denitrification technology transformation comprehensively considers furnace size, production operation data and denitrification temperature range. Based on the complete CFD analysis of SNCR denitrification in the decomposer furnace, it is arranged into a multi-layer temperature field spray point of "decomposer furnace + C5 cyclone outlet". The reducing agent is delivered quantitatively to the ammonia water spray gun set at the multi-layer spray point using a pump-distribution integrated equipment. After atomization, it is sprayed into the high-temperature zone of 850-1000℃ in the preheater system, so that the reducing agent reacts with NOx in the flue gas to form N2.

[0004] Currently, the existing ammonia spray guns used for denitrification in cement kilns have simple structures, poor atomization effects, and the atomization holes are prone to clogging, making them difficult to clean and maintain. Therefore, there is considerable room for optimization. Utility Model Content

[0005] In view of the problems and shortcomings of the existing technology, this utility model provides an ultra-low emission ammonia spray gun.

[0006] The technical solution of this utility model is as follows:

[0007] An ultra-low emission ammonia spray gun includes a nozzle, a first gun barrel, a connecting bayonet, a second gun barrel connected axially in sequence, and a fixed mounting sleeve fixed on the decomposition furnace to support the first gun barrel. The fluid inlet end of the second gun barrel is connected to a first branch pipe, and a second branch pipe is connected to the second gun barrel downstream of the first branch pipe.

[0008] The nozzle is detachably connected to the first gun barrel, and a filter and a seal are provided at the connection end; the second gun barrel is equipped with a flow meter and a pressure sensor, the flow meter is located upstream of the second branch pipe, and the pressure sensor is located downstream of the second branch pipe. Both the flow meter and the pressure sensor are communicatively connected to the control unit.

[0009] During operation, the fixed mounting sleeve is securely connected to the decomposition furnace. The nozzle and the first gun tube are inserted into the upper end of the fixed mounting sleeve and fixedly connected to the upper end of the fixed mounting sleeve via a connecting bayonet. Ammonia water or a liquid denitrification solvent containing urea enters the second gun tube through the first branch pipe, while gas enters the second gun tube through the second branch pipe and mixes with the ammonia water or urea-containing denitrification liquid solvent. The mixture is then ejected from the nozzle through the first gun tube. To facilitate nozzle cleaning and maintenance, the nozzle and the first gun tube are designed as detachable separate structures. A filter is installed at the connection end to prevent nozzle clogging, and a seal is installed at the connection end to prevent leakage.

[0010] Additionally, a flow meter is installed on the second nozzle downstream of the first branch pipe to measure the flow rate of ammonia water or denitrification solvent containing urea injected into the decomposition furnace. A pressure sensor is installed on the second nozzle downstream of the second branch pipe to detect the pressure inside the pipe. The pressure detection result is then obtained by the control unit and compared with the set value to determine whether the nozzle is blocked, and the result is notified to the user.

[0011] According to a specific embodiment, the nozzle includes a connecting tube connected to a first gun barrel and a nozzle head disposed at the end of the connecting tube. The connecting tube is connected to the first gun barrel via a threaded connection through a connecting hole, and a filter element and a seal element are disposed within the connecting hole.

[0012] The connecting pipe has an axially arranged fluid channel communicating with the first nozzle tube. This fluid channel includes a conical constriction section, a straight section, and a conical expansion section, arranged sequentially from the first nozzle tube towards the nozzle head. Furthermore, the cone angle of the conical constriction section is larger than that of the conical expansion section. By utilizing the Venturi principle, the denitrification liquid and denitrification solvent near the outlet pipe section are accelerated and pressurized, thereby reducing nozzle head clogging, improving atomization efficiency, and further increasing the mixing efficiency of the denitrification liquid and denitrification solvent, ultimately improving denitrification efficiency and reducing emissions.

[0013] According to a specific embodiment, the first branch pipe is connected to a liquid supply pipeline containing ammonia or urea via a valve, and is equipped with a first filter. The second branch pipe is connected to an air intake pipeline via a valve, and is equipped with a second filter. The valves on the first and second branch pipes are needle valves.

[0014] An ultra-low emission ammonia spray gun also includes an alarm module, which is communicatively connected to the control unit and is used to output audible and visual alarm signals based on the measurement results of the pressure sensor. When the pressure inside the nozzle is detected to be greater than the test-set pressure, the control unit controls the alarm module to issue an audible and visual alarm signal, indicating that the nozzle may be clogged and prompting timely inspection and maintenance.

[0015] The second nozzle is also equipped with a temperature sensor, which is connected to the control unit. The purpose is to detect and regulate the temperature of the denitrifying agent solvent liquid in real time, so as to ensure the complete decomposition of the fixed substances in the denitrifying agent solvent liquid and further reduce nozzle clogging.

[0016] The beneficial effects of this utility model are:

[0017] The nozzle and the first barrel are designed as detachable separate structures, facilitating nozzle cleaning and maintenance. A filter is installed at the connection end to effectively reduce nozzle clogging. The fluid channel within the nozzle is optimized to reduce nozzle head clogging, improve atomization efficiency, further enhance denitrification efficiency, and reduce nitrogen oxide emissions from the cement kiln's decomposition furnace. Attached Figure Description

[0018] Figure 1 This is a structural diagram of an embodiment.

[0019] Figure 2 This is a cross-sectional view of the nozzle;

[0020] 1. Nozzle; 11. Nozzle head; 12. Connecting pipe; 13. Fluid channel; 14. Connecting hole; 15. Filter element; 2. First gun barrel; 3. Fixed installation sleeve; 4. Connecting bayonet; 5. Plug; 6. Flow meter; 7. Second gun barrel; 8. First branch pipe; 81. First filter; 9. Second branch pipe; 91. Second filter. Detailed Implementation

[0021] The technical means adopted to achieve the intended purpose of this utility model will be further described below with reference to the accompanying drawings of the embodiments of this utility model.

[0022] Example

[0023] An ultra-low emission ammonia spray gun includes a nozzle 1, a first gun barrel 2, a connecting bayonet 4, and a second gun barrel 7 connected axially in sequence, and a fixed mounting sleeve 3 fixed on the decomposition furnace to support the first gun barrel 2. The fluid inlet end of the second gun barrel 7 is connected to a first branch pipe 8, and a second branch pipe 9 is connected to the second gun barrel 7 downstream of the first branch pipe 8.

[0024] Nozzle 1 is detachably connected to first barrel 2, and filter element 15 and seal are provided at the connection end; flow meter 6 and pressure sensor are provided on second barrel 7. Flow meter 6 is located upstream of second branch pipe 9, and pressure sensor is located downstream of second branch pipe 9. Flow meter 6 and pressure sensor are both connected to control unit.

[0025] During operation, the fixed mounting sleeve 3 is fixedly connected to the decomposition furnace. The nozzle 1 and the first gun barrel 2 are inserted from the upper end of the fixed mounting sleeve 3 and fixedly connected to the upper end of the fixed mounting sleeve 3 via the connecting bayonet 4. After use, the ammonia spray gun can be separated from the mounting sleeve via the connecting bayonet 4, and a plug 5 is connected to the end of the connecting bayonet 4. Ammonia or a liquid denitrification solvent containing urea enters the second gun barrel 7 through the first branch pipe 8, while gas enters the second gun barrel 7 through the second branch pipe 9 and mixes with the ammonia or urea-containing denitrification liquid solvent. Then, both are sprayed out from the nozzle 1 through the first gun barrel 2. To facilitate cleaning and maintenance of the nozzle 1, the nozzle 1 and the first gun barrel 2 are designed as detachable separate structures. A filter element 15 is installed at the connection end to prevent nozzle 1 from clogging, and a seal is installed at the connection end to prevent leakage at the connection point.

[0026] Additionally, a flow meter 6 is installed on the second nozzle 7 downstream of the first branch pipe 8 to measure the flow rate of ammonia water or denitrification liquid solvent containing urea injected into the decomposition furnace. A pressure sensor is installed on the second nozzle 7 downstream of the second branch pipe 9 to detect the pressure inside the pipe. The pressure detection result is obtained by the control unit and compared with the set value to determine whether the nozzle 1 is blocked, and the result is notified to the user.

[0027] According to a specific embodiment, the nozzle 1 includes a connecting pipe 12 connected to the first gun barrel 2, and a nozzle head 11 disposed at the end of the connecting pipe 12. The connecting pipe 12 is connected to the first gun barrel 2 by a threaded connection through a connecting hole 14. A filter element 15 and a sealing element are disposed in the connecting hole 14.

[0028] A fluid channel 13, communicating with the first gun barrel 2, is provided axially inside the connecting pipe 12. The fluid channel 13 includes a tapered constriction section, a straight section, and a tapered expansion section, arranged sequentially from the first gun barrel 2 towards the nozzle head 11. Furthermore, the cone angle of the tapered constriction section is larger than that of the tapered expansion section. By utilizing the Venturi principle, the denitrification liquid and denitrification solvent near the outlet pipe section are accelerated and pressurized, reducing clogging of the nozzle head 11 and improving the mixing efficiency of the denitrification liquid and denitrification solvent, thereby further improving denitrification efficiency and reducing emissions.

[0029] According to a specific embodiment, the first branch pipe 8 is connected to a liquid supply pipeline containing ammonia or urea via a valve, and is equipped with a first filter 81. The second branch pipe 9 is connected to an air intake pipeline via a valve, and is equipped with a second filter 91. The valves on the first branch pipe 8 and the second branch pipe 9 are needle valves.

[0030] An ultra-low emission ammonia spray gun also includes an alarm module, which is communicatively connected to the control unit and is used to output audible and visual alarm signals based on the measurement results of the pressure sensor. When the pressure inside the nozzle is detected to be greater than the test-set pressure, the control unit controls the alarm module to issue an audible and visual alarm signal, indicating that the nozzle may be clogged and prompting timely inspection and maintenance.

[0031] The second barrel 7 is also equipped with a temperature sensor, which is connected to the control unit. The purpose is to detect and regulate the temperature of the denitrifying agent solvent liquid in real time, so as to ensure the complete decomposition of the fixed substances in the denitrifying agent solvent liquid and further reduce the occurrence of nozzle 1 clogging.

[0032] The above description represents a preferred embodiment of the present invention. However, the present invention is not limited to the above-described embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, all variations, equivalent substitutions, and improvements made without departing from the concept of the present invention should be included within the protection scope of the present invention.

Claims

1. An ultra-low emission ammonia spray gun, comprising a nozzle (1), a first gun barrel (2), a connecting bayonet (4), and a second gun barrel (7) connected axially in sequence, and a fixing sleeve (3) fixed on a decomposition furnace for supporting the first gun barrel (2), wherein the fluid inlet end of the second gun barrel (7) is connected to a first branch pipe (8), and a second branch pipe (9) is connected to the second gun barrel (7) downstream of the first branch pipe (8); characterized in that, The nozzle (1) is detachably connected to the first barrel (2), and a filter (15) and a seal are provided at the connection end; The second barrel (7) is equipped with a flow meter (6) and a pressure sensor. The flow meter (6) is located upstream of the second branch pipe (9), and the pressure sensor is located downstream of the second branch pipe (9). Both the flow meter and the pressure sensor are connected to the control unit in communication.

2. The ammonia spray gun according to claim 1, characterized in that, The nozzle (1) includes a connecting pipe (12) connected to the first gun barrel (2) and a nozzle head (11) disposed at the end of the connecting pipe (12). The connecting pipe (12) is connected to the first gun barrel (2) by a threaded connection through a connecting hole (14). The filter element (15) and the seal are disposed in the connecting hole (14).

3. The ammonia spray gun according to claim 2, characterized in that, The connecting pipe (12) is provided with a fluid channel (13) communicating with the first gun barrel (2) along the axial direction. The fluid channel (13) includes a tapered constriction section, a straight section and a tapered expansion section, which are arranged sequentially from the first gun barrel (2) toward the nozzle head (11).

4. The ammonia spray gun according to claim 3, characterized in that, The cone angle of the tapered shrinking section is greater than that of the tapered expanding section.

5. The ammonia spray gun according to any one of claims 1-4, characterized in that, The first branch pipe (8) is connected to a liquid supply pipe containing ammonia or urea via a valve, and is equipped with a first filter (81).

6. The ammonia spray gun according to claim 5, characterized in that, The second branch pipe (9) is connected to the air intake pipe through a valve, and a second filter (91) is provided on it.

7. The ammonia spray gun according to claim 6, characterized in that, The valves on the first branch pipe (8) and the second branch pipe (9) are needle valves.

8. The ammonia spray gun according to claim 7, characterized in that, It also includes an alarm module, which communicates with the control unit and is used to output audible and visual alarm signals based on the measurement results of the pressure sensor.

9. The ammonia spray gun according to claim 8, characterized in that, The second barrel (7) is also equipped with a temperature sensor, which is connected in communication with the control unit.

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