Research and development verification device for large-flow exhaust emission control
By using ventilation equipment and an electronic control system to simulate high-flow-rate exhaust gas emission conditions, the problems of high cost and difficulty in simulating operating conditions in existing urea crystallization experiments have been solved, achieving efficient and low-cost urea crystallization verification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BEIHAI PROD QUALITY INSPECTION INST
- Filing Date
- 2025-05-20
- Publication Date
- 2026-05-01
AI Technical Summary
Existing technologies require the use of internal combustion engines when conducting urea crystallization experiments, resulting in high equipment costs and difficulty in simulating various working conditions, thus failing to effectively verify urea crystallization.
By employing ventilation equipment, air flow meters, heating equipment, pressure sensors, temperature sensors, electronic control PLCs, and urea injection devices, verification experiments were conducted to simulate high-flow-rate exhaust gas emission conditions, replacing the internal combustion engine and enabling real-time monitoring and adjustment.
Without consuming fuel, it significantly reduces experimental costs, can simulate different working conditions, improves operational efficiency and experimental accuracy, and saves time and space.
Smart Images
Figure CN224189543U_ABST
Abstract
Description
Research and verification device for high-flow-rate exhaust gas emission control Technical Field
[0001] This invention relates to a research and verification device for controlling high-flow-rate exhaust emissions, belonging to the field of engine technology. Background Technology
[0002] Internal combustion engines produce exhaust gases during operation. These gases cannot be directly emitted into the environment as they would pollute it and harm human health. Before emission, a catalytic converter is used to chemically react harmful substances in the exhaust gases, transforming them into relatively harmless substances. One type of catalytic converter is the Selective Catalytic Reduction (SCR) device. During operation, a urea solution is injected. The urea solution generates ammonia at high temperatures. The ammonia reacts with nitrogen oxides in the exhaust gases under the action of a catalyst, producing nitrogen and water, thus reducing the content of harmful substances in the exhaust gases. However, a potential problem arises during SCR operation: urea crystallization. Excessive urea can clog pipes and nozzles, reduce catalyst activity, and even damage the equipment. Therefore, certain SCR-based equipment requires a specialized urea crystallization experiment before installation. This experiment requires an internal combustion engine test bench, an engine, the catalytic converter under test, and a urea injection device to simulate the operating conditions of an internal combustion engine. This experiment is challenging due to the significant equipment and fuel costs, and the fact that a single internal combustion engine cannot simulate different operating conditions, making it difficult to measure urea crystallization under varying circumstances. Summary of the Invention
[0003] The technical problem to be solved by the present invention is to provide a research and development verification device for controlling large flow exhaust gas emissions. This device simulates the emission conditions of large flow exhaust gas without using an internal combustion engine or fuel, and is used for verification experiments. This solves the shortcomings of existing verification methods, such as high cost, the need for fuel in the equipment, and the inability to simulate multiple operating conditions.
[0004] The technical solution of the present invention is as follows: A research and verification device for controlling large-flow exhaust gas emissions, comprising the following components: a ventilation device, an air flow meter, a heating device, a pressure sensor, a temperature sensor, an electronic control PLC, and a urea injection device; the ventilation device is connected to the heating device through an inlet pipe, and an air flow meter is installed in the middle section of the inlet pipe; the heating device is connected to an outlet pipe, and a temperature sensor and a pressure sensor are installed in the middle section of the outlet pipe, and the urea injection device is connected to the end of the outlet pipe; the ventilation device, the air flow meter, the heating device, the pressure sensor, the temperature sensor, and the urea injection device are respectively connected to the electronic control PLC.
[0005] The ventilation equipment is a Roots blower.
[0006] The ventilation equipment is configured as one or two. When configured as two, the second ventilation equipment is connected to the first pipeline via the third pipeline.
[0007] The heating equipment is a kiln.
[0008] This application offers several advantages: 1. By using a ventilation device to dissipate exhaust gas instead of an internal combustion engine, it eliminates the need for fuel combustion, thus preventing exhaust emissions and environmental pollution. 2. Medium to large-sized internal combustion engines consume approximately 25-300 L / h of diesel fuel, and a single urea crystallization experiment requires 1-6 months. This application eliminates the need for diesel fuel, significantly reducing costs. 3. Traditional urea crystallization experiments require engine benches, including various specifications and models, as well as internal combustion engine combinations. Ultra-large displacement marine internal combustion engines and generator set internal combustion engines are difficult to obtain and expensive. This application eliminates these requirements by using a ventilation device, greatly saving costs. 4. All components of this application are connected to an electronic control PLC, enabling real-time monitoring and adjustments based on monitoring data. The same device can simulate different operating conditions, improving operational efficiency, saving time, steps, and space. Attached Figure Description
[0009] Figure 1 is a schematic diagram of this application;
[0010] Figure 2 is a schematic diagram of the catalyst connected in this application.
[0011] The following are the reference numerals: 1. Ventilation equipment; 2. Air flow meter; 3. Air inlet pipe 2; 4. Heating equipment; 5. Air outlet pipe; 6. Pressure sensor; 7. Temperature sensor; 8. PLC; 9. Urea injection device; 10. Catalyst; 11. Detailed Implementation
[0012] As shown in Figure 1, a research and verification device for controlling high-flow-rate exhaust gas emissions includes the following components: a ventilation device 1, an air flow meter 3, a heating device 5, a pressure sensor 7, a temperature sensor 8, an electronic control PLC 9, and a urea injection device 10. The ventilation device 1 is connected to the heating device 5 via an inlet pipe 2. In this embodiment, the ventilation device 1 is a Roots blower, which is connected to the electronic control PLC 9 via a cable. The ventilation device 1 can be configured as one or more units; in this embodiment, two units are used. When a larger gas flow rate is required, two units can be used. The second ventilation device 1 is connected to an inlet pipe 4, which is connected to the inlet pipe 2 via a tee. In this embodiment, the heating device 5 is a kiln, which can be an electric kiln or a gas-fired kiln, and the kiln temperature is PID-controlled. An air flow meter 3 is installed in the middle section of the inlet pipe 2, located between the tee and the heating device 5, and is connected to the electronic control PLC 9 via a cable. The kiln is connected to the exhaust pipe 6, which is connected to the PLC 9 via cables. A temperature sensor 8 and a pressure sensor 7 are installed in the middle section of the exhaust pipe 6, and both are connected to the PLC 9 via cables. The end of the exhaust pipe 6 is connected to the urea injection device 10. In actual use, the end of the exhaust pipe 6 is connected to the catalyst 11. The ventilation device 1, air flow meter 3, heating device 5, pressure sensor 7, temperature sensor 8, and urea injection device 10 are connected to the PLC 9 via cables, and can also be wirelessly connected to the PLC 9 via an IoT card.
[0013] The method of using this application is as follows: As shown in Figure 2, start all equipment. Air is introduced into the air inlet pipe 2 via the ventilation device 1. The air passes through the air flow meter 3, which measures the air flow rate and transmits the data to the PLC 9. If the experimental requirements are met, the experiment continues. If not, the ventilation rate of the ventilation device 1 is adjusted via the PLC 9 until the requirements are met. Air enters the heating device 5 and is heated. From the heating device 5, it enters the outlet pipe 6, passing through the temperature sensor 8 and pressure sensor 7. The temperature and pressure are measured by the temperature sensor 8 and pressure sensor 7, and the data is transmitted to the PLC 9. If the experimental requirements are met, the experiment continues. If not, the temperature of the heating device 5 is adjusted via the PLC 9 until the requirements are met. Urea injection device 10 injects urea into the outlet pipe 6. The urea mixes with the air and enters the catalyst 11. The time it takes for urea crystals to form in the catalyst 11, as well as the amount of urea crystals formed per unit time, can be observed. The urea injection device 10 is connected to the gas outlet pipe 6 through the urea nozzle. Experiments were conducted using nozzles with three different values. After running for 6 hours under each condition, the catalyst 11 was removed to check the crystallization status and determine the crystallization capacity limit.
[0014] In addition to conducting urea crystallization experiments, this application can also add various standard gases to the exhaust pipe 6 to replace the internal combustion engine exhaust gas and industrial exhaust gas according to the internal combustion engine operating conditions, in order to verify the catalyst 11 and the industrial catalytic purifier.
Claims
1. A research and verification device for controlling high-flow-rate exhaust gas emissions, characterized in that: The device includes the following components: ventilation device (1), air flow meter (3), heating device (5), pressure sensor (7), temperature sensor (8), PLC (9), and urea injection device (10); the ventilation device (1) is connected to the heating device (5) through an air inlet pipe (2), and an air flow meter (3) is installed in the middle section of the air inlet pipe (2); the heating device (5) is connected to an air outlet pipe (6), and a temperature sensor (8) and a pressure sensor (7) are installed in the middle section of the air outlet pipe (6), and the end of the air outlet pipe (6) is connected to the urea injection device (10); the ventilation device (1), air flow meter (3), heating device (5), pressure sensor (7), temperature sensor (8), and urea injection device (10) are respectively connected to the PLC (9).
2. A device for the development and validation of large flow exhaust emission control according to claim 1, characterized in that: The ventilation device (1) is a Roots blower.
3. The research and verification device for controlling large-flow exhaust gas emissions as described in claim 2, characterized in that: The ventilation device (1) is configured as one or two. When configured as two, the second ventilation device (1) is connected to the first pipe through the third pipe.
4. The research and verification device for controlling large-flow exhaust gas emissions as described in claim 3, characterized in that... The heating device (5) is a kiln.