A method for testing and debugging the performance of a centrifugal blower

Abstract

The present invention discloses a method for testing and debugging the performance of a centrifugal blower, comprising the following steps: obtaining a pneumatic component simulation model, a theoretical performance MAP diagram of the pneumatic component, and a theoretical simulation surge boundary value; superimposing the margin of the historical experience surge boundary value with the theoretical simulation surge boundary value to obtain a theoretical surge boundary combined with the historical experience surge boundary value; performing in-factory performance testing and debugging on the centrifugal blower to obtain an in-factory test performance MAP diagram and an in-factory performance test surge boundary; adding a model of an on-site pipeline to the pneumatic component simulation model to form a comprehensive simulation model of the blower's pneumatic components and the on-site pipeline; delivering the centrifugal blower to the installation site for testing and debugging to obtain an on-site actual performance MAP diagram and an on-site actual surge boundary; the testing and debugging method of the present invention can effectively solve the problem of poor adaptability of the centrifugal blower to load changes and failure of the on-site automatic adjustment capability causing abnormal production processes.

Description

Technical Field

[0001] The invention belongs to the technical field of centrifugal fan performance testing, and in particular relates to a centrifugal blower performance testing and debugging method. Background Art

[0002] Due to the inherent surge and flow characteristics of centrifugal impellers, the accuracy of their performance data determines the safety and reliability of the centrifugal blower's operation. The performance of the centrifugal impeller is not only affected by the structural characteristics of the impeller and volute itself, but also by the piping system, valve characteristics, load characteristics, etc., which will affect its actual performance. Therefore, it is particularly important to test and debug the performance of the centrifugal blower in order to set accurate parameters and reasonable control logic. Existing performance testing and debugging of centrifugal blower impellers is generally carried out on a factory test bench. During the test, the surge characteristics of the unstable state are reflected by characteristics such as changes in the system's sound, current, or flow, while the stable state characteristics are tested by changing the valve opening and / or the speed of the centrifugal blower.

[0003] The current test and debugging method is limited by the test conditions and cannot accurately reflect the characteristics of the centrifugal blower in the actual working site, resulting in the following problems with the blower: (1) The test process is complicated and tedious. Due to the certain risks in the test process, the test personnel are highly nervous; at the same time, because the test personnel cannot predict the operating status of the centrifugal blower in advance, the centrifugal blower surges many times during the test, and in severe cases, the machine is damaged; (2) Surge occurs frequently at the use site, causing the centrifugal blower to run unstable and vibrate violently, and in severe cases, the machine is damaged in a short time; (3) The performance of the centrifugal blower does not match the pipeline valve system, resulting in large pipeline pressure loss and abnormal noise, and in severe cases, it cannot meet the production process requirements; (4) It cannot adapt well to load changes, resulting in large fluctuations in system pressure and flow, and the automatic adjustment ability of the centrifugal blower fails, which in severe cases causes abnormal production process. Summary of the Invention

[0004] The present invention aims to provide a method for testing and debugging the performance of a centrifugal blower. The method can effectively solve the problem of poor adaptability to load changes and failure of on-site automatic adjustment capabilities of centrifugal blowers, which can cause production process abnormalities. To achieve the above-mentioned object, the present invention adopts the following technical solutions:

[0005] According to one aspect of the present invention, the present invention provides a method for testing and debugging the performance of a centrifugal blower, the method comprising the following steps:

[0006] Step 1: Design the pneumatic components of the centrifugal blower according to the operating parameters. Perform CFD fluid dynamics simulation analysis on the pneumatic components using a CFD simulation platform to obtain a pneumatic component simulation model, a theoretical performance MAP diagram of the pneumatic components, and a theoretical simulation surge boundary value.

[0007] Step 2: Compare and analyze the historical experience surge boundary value with the theoretical simulation surge boundary value, and superimpose the margin of the historical experience surge boundary value with the theoretical simulation surge boundary value to obtain a theoretical surge boundary combined with the historical experience surge boundary value;

[0008] Step 3: presetting a surge boundary of the centrifugal blower with a surge protection margin according to the theoretical surge boundary obtained in step 2 above in combination with the historical experience surge boundary value;

[0009] Step 4: Perform in-plant performance testing and debugging on the centrifugal blower to obtain the in-plant test performance MAP diagram and the in-plant test performance surge boundary, and modify the simulation model and boundary conditions of the CFD simulation analysis based on the obtained in-plant test performance MAP diagram and the in-plant performance test surge boundary;

[0010] Step 5: Add the model of the on-site pipeline to the pneumatic component simulation model obtained in the above step 1 to form a comprehensive simulation model of the blower pneumatic components and the on-site pipeline. Perform CFD fluid dynamics simulation analysis on the comprehensive simulation model to obtain a comprehensive theoretical performance MAP diagram of the on-site system and a comprehensive simulation surge boundary of the on-site system. Replace the surge boundary of the centrifugal blower of the surge protection margin set in the above step 3 with the comprehensive simulation surge boundary of the on-site system.

[0011] Step 6: Deliver the centrifugal blower to the installation site for testing and debugging, obtain the on-site real performance MAP diagram and the on-site real surge boundary, and replace the on-site system comprehensive simulation surge boundary in the above step 5 with the on-site real surge boundary. Then, set the final centrifugal blower surge boundary data, and perform the final load operation confirmation of the centrifugal blower system on site. Complete the on-site debugging and operation of the centrifugal blower system, and then enter the use stage.

[0012] The above solution is further preferred, wherein the operating parameters include pressure, flow, speed and power parameters when the centrifugal blower is running, and the pneumatic components include a centrifugal blower impeller, a diffuser and a volute.

[0013] In the above solution, it is further preferred that the surge protection margin is preset to be in the range of 5% to 10%.

[0014] The above scheme is further preferred. When the centrifugal blower is subjected to performance testing and debugging in the factory, a one-way valve, a loading valve and a muffler are sequentially arranged on the outlet test pipe of the centrifugal blower. During the test and debugging, the centrifugal blower is loaded by adjusting the loading valve to test the performance of the centrifugal blower at different operating speeds. When the pressure and flow of the centrifugal blower approach the theoretical surge boundary, the opening of the loading valve is adjusted to avoid sudden surge. When the centrifugal blower has a slight surge, the test is immediately terminated, the speed of the centrifugal blower is adjusted and the next test procedure is entered. The above test steps are repeated for multiple tests until the complete performance test of the centrifugal blower is completed, and its factory test performance MAP diagram is obtained, and the factory performance test surge boundary is drawn.

[0015] The above solution is further preferred, and when the centrifugal blower is delivered to the installation site for testing and debugging, the following steps are included:

[0016] Step S51: First, enter the no-load commissioning and testing program. A one-way valve, an isolation valve, a muffler, and a load are sequentially installed on the outlet pipeline of the centrifugal blower. The load is at the end of the on-site pipeline. During the on-site no-load test and commissioning, the isolation valve is fully opened, and a load is applied to the end of the on-site pipeline. The centrifugal blower is no-load commissioned to confirm its on-site adaptability and obtain on-site no-load commissioning data.

[0017] Step S52: After completing the on-site no-load commissioning and test procedure, gradually apply the load, and perform load testing and commissioning on the centrifugal blower by adjusting the speed and load size of the centrifugal blower 1. During the test, when the centrifugal blower operating data approaches the surge boundary of the on-site system comprehensive simulation, gradually open the vent valve configured for the centrifugal blower to avoid sudden surge. When the centrifugal blower experiences slight surge, immediately open the vent valve, adjust the speed of the centrifugal blower, and enter the next test procedure. Repeat the above steps for multiple tests until the complete performance commissioning and test of the centrifugal blower system is completed, and obtain its on-site real performance MAP diagram and on-site real surge boundary.

[0018] Step S53, replace the on-site system comprehensive simulation surge boundary with the on-site real surge boundary, set the final centrifugal blower on-site real performance MAP diagram and final surge boundary data, and perform the final on-site load operation confirmation of the centrifugal blower system, complete the on-site debugging and operation of the centrifugal blower system, and then enter the use stage.

[0019] The above solution is further preferred in that a load of 25% to 35% is applied to the end of the on-site pipeline 8 to perform no-load debugging on the centrifugal blower.

[0020] In summary, the invention adopts the above technical solution, and the invention has the following technical effects:

[0021] (1) It reduces the risk of damage caused by surge of centrifugal blowers during in-plant testing and reduces the stress of test personnel. In-plant test personnel can predict the operating status of the blower in advance, reduce surge during the blower test, and avoid machine damage;

[0022] (2) The parameters input into the centrifugal blower control program can accurately reflect the characteristics of the blower at the actual working site, solving the problems of frequent surge, unstable operation, and mismatch between blower performance and pipeline valve system at the working site;

[0023] (3) The performance of the centrifugal blower is well matched with the on-site pipeline valve system, and the system pressure loss is small, which improves the centrifugal blower's ability to adapt to changes in on-site loads and avoids the problem of abnormal production process caused by the failure of the centrifugal blower's automatic adjustment ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a flow chart of a method for testing and debugging the performance of a centrifugal blower according to the present invention;

[0025] Figure 2 It is a schematic diagram of the layout of the centrifugal blower factory test system of the present invention;

[0026] Figure 3 It is a schematic diagram of the arrangement of the centrifugal blower field use system of the present invention;

[0027] Figure 4 It is the performance MAP diagram of the centrifugal blower of the present invention;

[0028] In the accompanying drawings, there are a centrifugal blower 1, a one-way valve 2, a muffler 5, an isolation valve 6, an outlet field pipeline 7, a load 8, and a vent valve 9. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the invention more clearly understood, the invention is further described below with reference to the accompanying drawings and by way of preferred embodiments. However, it should be noted that many of the details listed in this specification are merely provided to help the reader gain a thorough understanding of one or more aspects of the invention, and that these aspects of the invention can be practiced even without these specific details.

[0030] Combine Figure 1 The present invention provides a method for testing and debugging the performance of a centrifugal blower, the method comprising the following steps:

[0031] Step 1: Design the pneumatic components of the centrifugal blower according to the operating parameters. Perform CFD fluid dynamics simulation analysis on the pneumatic components using a CFD simulation platform to obtain a pneumatic component simulation model, a theoretical performance MAP diagram of the pneumatic components, and a theoretical simulation surge boundary value.

[0032] Step 2: Compare and analyze the historical experience surge boundary value with the theoretical simulation surge boundary value, and superimpose the margin of the historical experience surge boundary value with the theoretical simulation surge boundary value to obtain a theoretical surge boundary combined with the historical experience surge boundary value;

[0033] Step 3: presetting a surge boundary of the centrifugal blower with a surge protection margin of 5% to 10% based on the theoretical surge boundary obtained in step 2 and combined with historical experience surge boundary values;

[0034] Step 4: Perform in-plant performance testing and debugging on the centrifugal blower to obtain the in-plant test performance MAP diagram and the in-plant test performance surge boundary, and modify the simulation model and boundary conditions of the CFD simulation analysis based on the obtained in-plant test performance MAP diagram and the in-plant performance test surge boundary;

[0035] Step 5: Add the model of the on-site pipeline to the pneumatic component simulation model obtained in the above step 1 to form a comprehensive simulation model of the blower pneumatic components and the on-site pipeline. Perform CFD fluid dynamics simulation analysis on the comprehensive simulation model to obtain a comprehensive theoretical performance MAP diagram of the on-site system and a comprehensive simulation surge boundary of the on-site system. Replace the centrifugal blower surge boundary with a surge protection margin of 5% to 10% set in the above step 3 with the comprehensive simulation surge boundary of the on-site system.

[0036] Step 6: Deliver the centrifugal blower to the installation site for testing and debugging, obtain the on-site real performance MAP diagram and the on-site real surge boundary, and replace the on-site system comprehensive simulation surge boundary in the above step 5 with the on-site real surge boundary. Then, set the final centrifugal blower surge boundary data, and perform the final load operation confirmation of the centrifugal blower system on site. Complete the on-site debugging and operation of the centrifugal blower system, and then enter the use stage.

[0037] In the present invention, Figure 2As shown, when the centrifugal blower is subjected to performance testing and debugging in the factory, a one-way valve 2, a loading valve 3 and a muffler 5 are sequentially arranged on the outlet test pipe 4 of the centrifugal blower 1. During the test and debugging, the centrifugal blower is loaded by adjusting the loading valve 3 to test the performance of the centrifugal blower at different operating speeds; when the pressure and flow of the centrifugal blower are about to approach the theoretical surge boundary, the opening of the loading valve 3 is adjusted to avoid sudden surge, and the test is immediately terminated when a slight surge occurs in the centrifugal blower, and the speed of the centrifugal blower is adjusted to enter the next test procedure; the above test steps are repeated for multiple tests until the complete performance test of the centrifugal blower is completed, and its factory test performance MAP diagram is obtained, and the factory performance test surge boundary is drawn.

[0038] In the present invention, Figure 3 As shown, when the centrifugal blower is delivered to the installation site for testing and commissioning, the following steps are included:

[0039] Step S51: first enter the no-load commissioning and test procedure, and sequentially configure the one-way valve 2, the isolation valve 6, the muffler 5, and the load 8 on the outlet field pipeline 7 of the centrifugal blower 1. The load 8 is at the end of the field pipeline 7. During the field no-load test and commissioning, the isolation valve 6 is fully opened, and a load 8 of about 25%-35%, preferably 30%, is applied to the end of the field pipeline 7. The centrifugal blower 1 is no-load commissioned to confirm its field adaptability and obtain field no-load commissioning data. The applied load 8 is one or more of the pressure, flow, speed, or power parameters of the centrifugal blower, or a load parameter of other parameters;

[0040] Step S52, after completing the on-site no-load debugging and test procedures, gradually apply the load, and perform load testing and debugging on the centrifugal blower 1 by adjusting the speed of the centrifugal blower 1 and the size of the load 8. During the test, when the centrifugal blower operation data is about to approach the surge boundary of the on-site system comprehensive simulation, gradually open the vent valve 9 configured for the centrifugal blower 1 to avoid sudden surge, until the centrifugal blower 1 has a slight surge, immediately open the vent valve 9, adjust the speed of the centrifugal blower and enter the next test procedure; repeat the above steps for multiple tests until the complete performance debugging and testing of the centrifugal blower system is completed, and its on-site real performance MAP diagram and surge boundary are obtained.

[0041] Step S53, replace the on-site system comprehensive simulation surge boundary with the on-site real surge boundary, set the final centrifugal blower on-site real performance MAP diagram and final surge boundary data, and perform the final on-site load operation confirmation of the centrifugal blower system, complete the on-site debugging and operation of the centrifugal blower system, and then enter the use stage.

[0042] In the present invention, Figure 4As shown, the present invention obtains various performance curves of the centrifugal blower at 40% to 105% of the rated speed through performance testing and debugging of the centrifugal blower, and obtains the surge boundary ① of the centrifugal blower performance test in the factory, the actual surge boundary ② of the field, the surge boundary of the field system comprehensive simulation ③ and the theoretical surge boundary ④ combined with the surge boundary value of historical experience. The present invention proposes to pre-set the surge boundary based on the computer simulation results and empirical data of the comprehensive blower itself, so as to reduce the danger of the factory test process and the tension of the test personnel. The factory test personnel can predict the operating status of the blower in advance, reduce the surge during the blower test process, and avoid machine damage; a method for on-site no-load debugging based on the computer comprehensive simulation results of three comprehensive factors, namely, factory test data, the performance of the blower itself, and the on-site pipeline system, is proposed, which solves the problems of frequent surge, unstable operation, and mismatch between the blower performance and the pipeline valve system at the site of use; based on the on-site no-load debugging data, loaded debugging is carried out in combination with the load characteristics, and relevant parameters are set in combination with the loaded debugging results, which effectively solves the problems of poor adaptability of centrifugal blowers to load changes and failure of on-site automatic adjustment capabilities causing abnormal production processes.

[0043] The above is only a preferred embodiment of the invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the invention. These improvements and modifications should also be regarded as within the scope of protection of the invention.

Claims

1. A method for testing and debugging the performance of a centrifugal blower, characterized by: The test and debugging method comprises the following steps: Step 1: Design the pneumatic components of the centrifugal blower according to the operating parameters. Perform CFD fluid dynamics simulation analysis on the pneumatic components using a CFD simulation platform to obtain a pneumatic component simulation model, a theoretical performance MAP diagram of the pneumatic components, and a theoretical simulation surge boundary value. Step 2: Compare and analyze the historical experience surge boundary value with the theoretical simulation surge boundary value, and superimpose the margin of the historical experience surge boundary value with the theoretical simulation surge boundary value to obtain a theoretical surge boundary combined with the historical experience surge boundary value; Step 3: presetting a surge boundary of the centrifugal blower with a surge protection margin according to the theoretical surge boundary obtained in step 2 above in combination with the historical experience surge boundary value; Step 4: Perform in-plant performance testing and debugging on the centrifugal blower, obtain the in-plant test performance MAP diagram and the in-plant performance test surge boundary, and modify the simulation model and boundary conditions of the CFD simulation analysis based on the obtained in-plant test performance MAP diagram and the in-plant performance test surge boundary; Step 5: Add the model of the on-site pipeline to the pneumatic component simulation model obtained in the above step 1 to form a comprehensive simulation model of the blower pneumatic components and the on-site pipeline. Perform CFD fluid dynamics simulation analysis on the comprehensive simulation model to obtain a comprehensive theoretical performance MAP diagram of the on-site system and a comprehensive simulation surge boundary of the on-site system. Replace the surge boundary of the centrifugal blower of the surge protection margin set in the above step 3 with the comprehensive simulation surge boundary of the on-site system. Step 6: Deliver the centrifugal blower to the installation site for testing and debugging, obtain the on-site real performance MAP diagram and the on-site real surge boundary, and replace the on-site system comprehensive simulation surge boundary in the above step 5 with the on-site real surge boundary. Then, set the final centrifugal blower surge boundary data, and perform the final load operation confirmation of the centrifugal blower system on site. Complete the on-site debugging and operation of the centrifugal blower system, and then enter the use stage.

2. A centrifugal blower performance testing and debugging method according to claim 1, characterized in that: The operating parameters include pressure, flow, speed and power parameters required for the centrifugal blower to operate, and the pneumatic components include a centrifugal blower impeller, a diffuser and a volute.

3. The method for testing and debugging the performance of a centrifugal blower according to claim 1, characterized in that: The surge protection margin is preset to range from 5% to 10%.

4. A centrifugal blower performance testing and debugging method according to claim 1, characterized in that: When the centrifugal blower is undergoing performance testing and debugging in the factory, a one-way valve, a loading valve and a muffler are sequentially configured on the outlet test pipe of the centrifugal blower. During the test and debugging, the centrifugal blower is loaded by adjusting the loading valve to test the performance of the centrifugal blower at different operating speeds. When the pressure and flow of the centrifugal blower approach the theoretical surge boundary, the loading valve opening is adjusted to avoid sudden surge. The test is terminated immediately when a slight surge occurs in the centrifugal blower, and the speed of the centrifugal blower is adjusted to enter the next test procedure. The above test steps are repeated for multiple tests until the complete performance test of the centrifugal blower is completed, and its factory test performance MAP diagram is obtained, and the factory performance test surge boundary is drawn.

5. The method for testing and debugging the performance of a centrifugal blower according to claim 1, characterized in that: When the centrifugal blower is delivered to the installation site for testing and commissioning, the following steps are included: Step S51: First, enter the no-load commissioning and testing program. A one-way valve, an isolation valve, a muffler, and a load are sequentially installed on the outlet pipeline of the centrifugal blower. The load is at the end of the on-site pipeline. During the on-site no-load test and commissioning, the isolation valve is fully opened, and a load is applied to the end of the on-site pipeline. The centrifugal blower is no-load commissioned to confirm its on-site adaptability and obtain on-site no-load commissioning data. Step S52: After completing the on-site no-load commissioning and test procedures, gradually apply load, and perform load testing and commissioning on the centrifugal blower by adjusting the speed and load of the centrifugal blower. During the test, when the centrifugal blower operating data approaches the surge boundary of the on-site system comprehensive simulation, gradually open the vent valve configured for the centrifugal blower to avoid sudden surge. When the centrifugal blower experiences slight surge, immediately open the vent valve, adjust the speed of the centrifugal blower, and proceed to the next test procedure. Repeat the above steps for multiple tests until the complete performance commissioning and testing of the centrifugal blower system is completed, and its actual on-site performance MAP diagram and actual on-site surge boundary are obtained; Step S53, replace the on-site system comprehensive simulation surge boundary with the on-site real surge boundary, set the final centrifugal blower on-site real performance MAP diagram and final surge boundary data, and perform the final on-site load operation confirmation of the centrifugal blower system, complete the on-site debugging and operation of the centrifugal blower system, and then enter the use stage.

6. A centrifugal blower performance testing and debugging method according to claim 4, characterized in that: Apply 25%-35% load to the end of the on-site pipeline to perform no-load commissioning on the centrifugal blower.

7. A centrifugal blower performance testing and debugging method according to claim 1, characterized in that: The load applied at 25%-35% is, but is not limited to, one or more of the pressure, flow, speed or power parameters of the centrifugal blower.

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