High-speed negative-pressure spraying device for denitration skid-mounted station

Abstract

The utility model provides a high-speed negative pressure spraying device for a denitration skid-mounted station, which relates to the technical field of spraying devices and comprises a volute fan, and the output end of the volute fan is connected with a spraying assembly. The spraying assembly comprises a conical air spraying pipe connected with the output end of the volute fan, and the conical air spraying pipe is sleeved with a spraying pipe; the injection pipe sequentially comprises a negative pressure cavity, a folding cavity, a smooth cavity, a release cavity and a flow guide cavity from left to right. According to the utility model, negative pressure can be formed when high-speed air flow passes through the negative pressure cavity, urea powder is sucked into the negative pressure cavity to be mixed with air, and the urea powder is efficiently conveyed to a reaction area through the high-speed air flow to be fully contacted and reacted with NOx, so that the urea is decomposed into ammonia gas, and the denitration efficiency is improved; a urea solution is replaced, and the problems that a traditional liquid reducing agent injection system is uneven in injection, high in equipment complexity and poor in environmental adaptability and has leakage hidden dangers are solved.

Description

Technical Field

[0001] This utility model relates to the field of spray device technology, and in particular to a high-speed negative pressure spray device for denitrification skid-mounted stations. Background Technology

[0002] Industrial kilns generate large amounts of nitrogen oxides (NOx) during high-temperature combustion, a significant source of air pollution. NOx is not only a major precursor to acid rain and photochemical smog, but also poses serious threats to the ecological environment and human health. To meet increasingly stringent environmental requirements, countries have set limits on NOx concentrations from industrial emissions. With the implementation of air pollution prevention and control action plans, many industries are required to meet the Class A standard of NOx emission concentration ≤50 mg / Nm³, which places higher demands on denitrification technologies.

[0003] In the industrial sector, tunnel kilns and other similar kilns, due to their long operating hours, high-temperature combustion, and large flue gas volumes, have become key targets for NOx emission control. Currently, two main technologies are employed for NOx emission reduction: Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR).

[0004] SCR technology relies on catalysts for reduction reactions. Although it has high denitrification efficiency, the catalysts are expensive and have poor adaptability to complex kiln conditions, making it unsuitable for tunnel kilns with long kiln structures.

[0005] SNCR technology, operating within a temperature range of 850-1100°C, reacts NOx with a reducing agent (such as ammonia or urea) to produce nitrogen and water. Compared to SCR technology, SNCR does not require a catalyst, making the system simpler and less expensive. However, traditional SNCR systems often rely on liquid reducing agents, which presents certain limitations.

[0006] While SNCR technology is widely used, traditional liquid reducing agent injection systems still face challenges in practical operation. These include: uneven spraying: the distribution of liquid ammonia or urea solution within the kiln is easily affected by temperature field and airflow disturbances, leading to incomplete reduction reactions or decreased efficiency. Safety risks: liquid reducing agents are volatile and toxic during transportation, storage, and injection, posing a risk of leakage. High equipment complexity: liquid systems require precise pumps, pipelines, and nozzle maintenance, and are prone to crystallization and blockage, increasing operational difficulty and costs. Poor environmental adaptability: the high temperature, high dust, and long kiln body characteristics of tunnel kilns make it difficult for traditional liquid injection equipment to operate stably for extended periods, especially in negative pressure environments where injection efficiency is low. Utility Model Content

[0007] The purpose of this invention is to provide a high-speed negative pressure injection device for denitrification skid-mounted stations, which solves the problems mentioned in the background art of uneven injection, potential leakage, high equipment complexity, and poor environmental adaptability of traditional liquid reducing agent injection systems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a high-speed negative pressure jetting device for a denitrification skid-mounted station, comprising a volute fan, wherein the output end of the volute fan is connected to a jetting assembly;

[0009] The injection assembly includes a conical jet pipe connected to the output end of the volute fan, and the conical jet pipe is fitted with an injection pipe.

[0010] The jet pipe includes, from left to right, a negative pressure chamber, a gathering chamber, a smoothing chamber, a release chamber, and a guiding chamber;

[0011] A feed pipe runs through the top of the negative pressure chamber.

[0012] Preferably, the inlet diameter of the retracting cavity is greater than the outlet diameter, the inlet diameter of the releasing cavity is less than the outlet diameter, the inlet diameter of the retracting cavity is greater than the outlet diameter of the releasing cavity, and the outlet diameter of the retracting cavity is equal to the inlet diameter of the releasing cavity.

[0013] Preferably, the negative pressure chamber is fixedly connected to the inlet of the gathering chamber, the flow guiding chamber is fixedly connected to the outlet of the release chamber, and the two ends of the smoothing chamber are fixedly connected to the outlet of the gathering chamber and the inlet of the release chamber, respectively.

[0014] Preferably, the length of the retracting cavity is smaller than that of the releasing cavity.

[0015] Preferably, a monitoring pipe is also connected between the volute blower and the conical jet pipe. The monitoring pipe includes a first monitoring pipe, a second monitoring pipe, and a third monitoring pipe. The first and second monitoring pipes are connected in series between the volute blower and the conical jet pipe, and the third monitoring pipe is connected in parallel to the second monitoring pipe.

[0016] Preferably, a vortex flow meter is installed on both the first and third monitoring pipes, a pressure alarm is installed on the second monitoring pipe, and an electric regulating valve is installed on both the second and third monitoring pipes.

[0017] Preferably, the air inlet end of the volute fan is connected to an air filter.

[0018] Preferably, there are at least two volute fans, and the air inlet end is connected to the air outlet pipe of the air filter, and the output end is connected to the monitoring pipe. Each volute fan is equipped with a check valve on both the air inlet end and the output end.

[0019] Preferably, each of the volute fans is equipped with a temperature sensor for temperature measurement and alarm, and multiple volute fans are installed inside a heat insulation box, which is equipped with multiple fans for heat dissipation.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] 1. The volute blower provides high-speed airflow, powering the entire negative pressure injection system and ensuring sufficient negative pressure within the device. This allows for the uniform delivery of urea granules to the injection pipe. The conical jet pipe guides the high-speed airflow generated by the volute blower into the injection pipe, simultaneously rectifying and accelerating the airflow, reducing turbulence, and improving injection uniformity. The injection pipe delivers urea granules and injects them into the reaction zone of the kiln. The negative pressure chamber generates suction by creating negative pressure within the high-speed airflow from the conical jet pipe, drawing urea granules from the feed pipe into the injection pipe and conveying them to the collection chamber. The collection chamber concentrates and compresses the airflow, increasing the kinetic energy of the granules carried by the airflow, improving injection speed, and enhancing granule decomposition efficiency. The smoothing chamber rectifies the airflow passing through the collection chamber, reducing turbulence and improving the accuracy of granule injection direction. The release chamber increases the pressure of the airflow passing through the smoothing chamber, enhancing the force of granule injection.

[0022] II. By setting up monitoring pipelines, key parameters within the entire system can be monitored. Vortex flow meters on the first and third monitoring pipelines accurately measure airflow and provide real-time data feedback to the control system, improving system automation and ensuring injection efficiency. A pressure alarm on the second monitoring pipeline detects abnormal pressure within the system and issues an alarm signal, allowing for early fault detection and preventing equipment damage. Electric regulating valves precisely control airflow and the injection rate of urea particles. Air filters remove moisture from the outside air, ensuring dry air enters the volute blower and preventing moisture from contacting urea particles and forming clumps. Check valves prevent airflow backflow, protecting pipelines and equipment. Temperature sensors monitor the temperature of the volute blower; when the temperature of the running volute blower reaches a set value, another idle volute blower is switched to prevent equipment failure due to high temperatures. Insulation boxes prevent the high temperature of the volute blower from affecting urea injection.

[0023] In summary, this invention utilizes the negative pressure created when high-speed airflow passes through the negative pressure chamber to draw urea powder into the chamber and mix it with air. The high-speed airflow then efficiently transports the granular urea to the reaction zone, where it fully contacts and reacts with NOx, decomposing the urea into ammonia and improving denitrification efficiency. Furthermore, by using sprayed granular urea as a reducing agent instead of liquid ammonia or urea solution, it avoids the problems of uneven spraying, leakage risks, high equipment complexity, and poor environmental adaptability associated with traditional liquid reducing agent spraying systems. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the spray assembly structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the monitoring pipeline structure of this utility model;

[0027] Figure 4 This is a schematic diagram of the internal structure of the heat insulation box of this utility model.

[0028] The following are the labels in the diagram: 1. Volute fan; 21. Conical jet pipe; 22. Jet pipe; 221. Negative pressure chamber; 222. Converging chamber; 223. Smoothing chamber; 224. Release chamber; 225. Guide chamber; 3. Feed pipe; 4. Monitoring pipe; 41. First monitoring pipe; 42. Second monitoring pipe; 43. Third monitoring pipe; 5. Vortex flow meter; 6. Pressure alarm; 7. Electric regulating valve; 8. Check valve; 9. Temperature sensor; 10. Air filter; 11. Insulation box. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example 1

[0031] Please see Figure 1 and Figure 2 As shown, this utility model provides a technical solution: a high-speed negative pressure jetting device for a denitrification skid-mounted station, including a volute fan 1, with a jetting assembly connected to the output end of the volute fan 1;

[0032] The injection assembly includes a conical jet pipe 21 connected to the output end of the volute fan 1, and an injection pipe 22 is fitted over the conical jet pipe 21.

[0033] The jet pipe 22 includes, from left to right, a negative pressure chamber 221, a gathering chamber 222, a smoothing chamber 223, a release chamber 224, and a guide chamber 225;

[0034] The top of the negative pressure chamber 221 is penetrated by the feed pipe 3.

[0035] Furthermore, the inlet diameter of the retracting cavity 222 is greater than the outlet diameter, the inlet diameter of the releasing cavity 224 is less than the outlet diameter, the inlet diameter of the retracting cavity 222 is greater than the outlet diameter of the releasing cavity 224, and the outlet diameter of the retracting cavity 222 is equal to the inlet diameter of the releasing cavity 224.

[0036] Furthermore, the negative pressure chamber 221 is fixedly connected to the inlet of the gathering chamber 222, the guide chamber 225 is fixedly connected to the outlet of the release chamber 224, and the two ends of the smoothing chamber 223 are fixedly connected to the outlet of the gathering chamber 222 and the inlet of the release chamber 224, respectively.

[0037] Furthermore, the length of the retraction cavity 222 is shorter than that of the release cavity 224.

[0038] The volute blower 1 provides high-speed airflow to power the entire negative pressure injection system, ensuring sufficient negative pressure within the device to uniformly deliver urea granules to the injection pipe 22. The conical jet pipe 21 guides the high-speed airflow generated by the volute blower 1 to the injection pipe 22, while simultaneously rectifying and accelerating the airflow, reducing airflow turbulence, and improving injection uniformity. The injection pipe 22 delivers urea granules and injects them into the reaction zone of the kiln. The negative pressure chamber 221 generates suction by creating negative pressure inside through the high-speed airflow ejected from the conical jet pipe 21, drawing urea granules from the feed pipe 3 into the injection pipe 22 and conveying them to the collection chamber 222. The collection chamber 222 concentrates and compresses the airflow, increasing the kinetic energy of the airflow carrying the granules, improving the injection speed, and enhancing the granule decomposition efficiency. The smoothing chamber 223 rectifies the airflow passing through the collection chamber 222, reducing turbulence and improving the accuracy of the granule injection direction. The release chamber 224 increases the pressure of the airflow passing through the smoothing chamber 223, increasing the force of granule injection.

[0039] Example 2

[0040] Please see Figure 1 , Figure 3 and Figure 4 As shown in the first embodiment, as another implementation of this utility model, a monitoring pipe 4 is also connected between the volute fan 1 and the conical jet pipe 21. The monitoring pipe 4 includes a first monitoring pipe 41, a second monitoring pipe 42 and a third monitoring pipe 43. The first monitoring pipe 41 and the second monitoring pipe 42 are connected in series between the volute fan 1 and the conical jet pipe 21, and the third monitoring pipe 43 is connected in parallel to the second monitoring pipe 42.

[0041] Furthermore, vortex flow meters 5 are installed on the first monitoring pipe 41 and the third monitoring pipe 43, a pressure alarm 6 is installed on the second monitoring pipe 42, and an electric regulating valve 7 is installed on both the second monitoring pipe 42 and the third monitoring pipe 43.

[0042] Furthermore, an air filter 10 is connected to the air inlet end of the volute fan 1.

[0043] Furthermore, there are at least two volute fans 1, and their inlet ends are simultaneously connected to the outlet pipe of the air filter 10, while their outlet ends are simultaneously connected to the monitoring pipe 4. Each volute fan 1 is equipped with a check valve 8 at both its inlet and outlet ends.

[0044] Furthermore, each volute fan 1 is equipped with a temperature sensor 9 for temperature measurement and alarm, and multiple volute fans 1 are installed inside the heat insulation box 11, which is also equipped with multiple fans for heat dissipation.

[0045] Monitoring pipe 4 is used to monitor key parameters within the entire system. Vortex flow meters 5 on the first monitoring pipe 41 and the third monitoring pipe 43 can accurately measure airflow and provide real-time feedback data to the control system, improving the system's automation level and ensuring injection efficiency. Pressure alarm 6 on the second monitoring pipe 42 can detect abnormal pressure within the system and issue an alarm signal, identifying faults in advance and preventing equipment damage. Electric regulating valve 7 can precisely control airflow and the injection rate of urea particles. Air filter 10 can filter moisture from the outside air, allowing dry air to enter the volute blower 1 and preventing moisture from contacting urea particles and forming clumps. Check valve 8 can prevent airflow backflow, protecting pipes and equipment. Temperature sensor 9 can monitor the temperature of volute blower 1. When the temperature of the running volute blower 1 reaches the set value, another idle volute blower 1 is switched to prevent equipment failure due to high temperature. Insulation box 11 can prevent the high temperature of volute blower 1 from affecting urea injection.

[0046] Working principle: First, a high-speed negative pressure injection device for a denitrification skid-mounted station is moved to the working position. In use, the first step is to start the air filter 10 to send the freshly dried air into the volute fan 1. The second step is to open the electric regulating valve 7 so that the dried air can enter the conical jet pipe 21. The third step is that after the dried air enters the conical jet pipe 21, it passes through the negative pressure chamber 221. When passing through the negative pressure chamber 221, a negative pressure is formed, which draws urea powder from the feed pipe 3 into the negative pressure chamber 221 and mixes it with the air. The fourth step is that the urea powder mixed with the air passes through the gathering chamber 222, the smoothing chamber 223, and the release chamber 224 in sequence to accelerate and pressurize, and finally sprays it out through the guide chamber 225. This completes the use process of a high-speed negative pressure injection device for a denitrification skid-mounted station.

[0047] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-speed negative pressure jetting device for a denitrification skid-mounted station, characterized in that: Includes a volute fan (1), the output end of which is connected to a jet assembly; The injection assembly includes a conical jet pipe (21) connected to the output end of the volute fan (1), and the conical jet pipe (21) is fitted with an injection pipe (22). The jet pipe (22) includes, from left to right, a negative pressure chamber (221), a gathering chamber (222), a smoothing chamber (223), a release chamber (224), and a guide chamber (225). The top of the negative pressure chamber (221) is penetrated by a feed pipe (3).

2. The high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 1, characterized in that, The inlet diameter of the gathering cavity (222) is greater than the outlet diameter, the inlet diameter of the release cavity (224) is less than the outlet diameter, the inlet diameter of the gathering cavity (222) is greater than the outlet diameter of the release cavity (224), and the outlet diameter of the gathering cavity (222) is equal to the inlet diameter of the release cavity (224).

3. The high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 2, characterized in that, The negative pressure chamber (221) is fixedly connected to the inlet of the gathering chamber (222), the flow guiding chamber (225) is fixedly connected to the outlet of the release chamber (224), and the two ends of the smoothing chamber (223) are fixedly connected to the outlet of the gathering chamber (222) and the inlet of the release chamber (224), respectively.

4. The high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 3, characterized in that, The length of the retracting cavity (222) is smaller than that of the releasing cavity (224).

5. The high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 1, characterized in that, A monitoring pipe (4) is also connected between the volute blower (1) and the conical jet pipe (21). The monitoring pipe (4) includes a first monitoring pipe (41), a second monitoring pipe (42) and a third monitoring pipe (43). The first monitoring pipe (41) and the second monitoring pipe (42) are connected in series between the volute blower (1) and the conical jet pipe (21), and the third monitoring pipe (43) is connected in parallel to the second monitoring pipe (42).

6. The high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 5, characterized in that, Vortex flow meters (5) are installed on the first monitoring pipe (41) and the third monitoring pipe (43), a pressure alarm (6) is installed on the second monitoring pipe (42), and an electric regulating valve (7) is installed on the second monitoring pipe (42) and the third monitoring pipe (43).

7. A high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 4 or 6, characterized in that, The air intake end of the volute fan (1) is connected to an air filter (10).

8. A high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 7, characterized in that, The number of the volute fan (1) is at least 2, and the air inlet end is connected to the air outlet pipe of the air filter (10) at the same time, and the output end is connected to the monitoring pipe (4) at the same time. Each of the volute fans (1) is equipped with a check valve (8) on the air inlet end and the output end.

9. A high-speed negative pressure jetting device for a denitrification skid-mounted station according to claim 8, characterized in that, Each of the volute fans (1) is equipped with a temperature sensor (9) for temperature measurement and alarm. Multiple volute fans (1) are installed inside a heat insulation box (11), and the heat insulation box (11) is equipped with multiple fans for heat dissipation.

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