A high efficiency combined ejector system capable of stepless regulation under wide load

Abstract

This invention discloses a high-efficiency combined ejector system capable of stepless adjustment under a wide load range, specifically relating to the field of fluid transport technology. It includes n fixed ejectors with capacities arranged in an arithmetic or geometric sequence and controlled by solenoid valves for opening and closing, and an adjustable ejector for continuous flow control by adjusting the nozzle throat area. The two are connected in parallel. The capacities of the fixed ejectors typically follow a binary geometric sequence, with the minimum capacity being 6.25% of the system's rated load, and the remaining capacities being 12.5%, 25%, 50%, etc. The adjustable ejector's adjustment range is from 0 to the minimum fixed ejector capacity. The system selects the fixed ejector combination based on the target load value using a binary combination algorithm. The remaining load is compensated by the adjustable ejector. Combined with a one-way valve to prevent backflow of the medium, it can achieve stepless adjustment within a load range of 0%-100%, offering advantages such as a wide adjustment range, high precision, efficient and reasonable adjustment, and stable and safe operation.

Description

Technical Field

[0001] This invention relates to the field of fluid transport technology, and more specifically, to a high-efficiency combined injector system that can be steplessly adjusted under a wide load range. Background Technology

[0002] Injector systems are widely used in various industrial processes, such as chemical production and energy conversion, and their performance directly affects production efficiency and energy utilization efficiency. With the continuous expansion of industrial production scale and the increasing complexity of production processes, higher requirements are placed on the adjustment capabilities of injector systems under different load conditions.

[0003] Traditional injector systems have many limitations in load regulation. Some injector systems only have a fixed flow rate output and cannot be flexibly adjusted according to actual operating conditions, resulting in significant energy waste and low equipment operating efficiency under conditions of large load fluctuations. For example, in some production processes, when the load demand decreases, the fixed-flow injector continues to output a large flow rate, causing excessive energy consumption.

[0004] While some adjustable injector systems can be adjusted to a certain extent, the adjustment method is relatively coarse, often only achieving stepped adjustment, which cannot meet the process requirements of some processes with high flow accuracy. This stepped adjustment method will result in large load gaps during the adjustment process, making it difficult for the system to achieve a smooth transition when switching between different load states, thus affecting the stability of the production process.

[0005] Furthermore, existing injector systems are inadequate in preventing backflow of the working medium. Backflow of the working medium can cause corrosion and damage to equipment in the system, reduce equipment lifespan, increase maintenance costs, and may even lead to safety accidents, seriously affecting normal production.

[0006] In summary, existing injector systems have shortcomings in terms of wide load adjustment capability, adjustment accuracy, and prevention of media backflow, and cannot meet the production requirements of modern industry for high efficiency, stability, and safety. Therefore, developing an injector system that can be steplessly adjusted and is highly efficient and stable under wide loads is of great practical significance. Summary of the Invention

[0007] In order to overcome the above-mentioned defects of the prior art, the present invention provides a high-efficiency combined injector system that can be steplessly adjusted under a wide load, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-efficiency combined injector system capable of stepless adjustment under a wide load range, comprising:

[0009] There are n fixed injectors with different capacities, the capacities of which are arranged in an arithmetic or geometric sequence, and each fixed injector is controlled to open and close by a solenoid valve.

[0010] An adjustable injector that achieves continuous flow control by adjusting the nozzle throat area;

[0011] The fixed injector and the adjustable injector are connected in parallel, and by combining the flow rates of the fixed injector and the adjustable injector, the system can achieve stepless adjustment within the load range of 0% to 100%.

[0012] Preferably, the capacity of the fixed injectors is configured in a binary proportional sequence, wherein the capacity of the smallest fixed injector is 6.25% of the system rated load, and the capacities of the remaining fixed injectors are 12.5%, 25%, and 50% respectively.

[0013] Preferably, the adjustable injector has an adjustment range from 0 to the minimum capacity value of the fixed injector, which is used to cover the load gap between two adjacent fixed injector combinations.

[0014] Preferably, the opening and closing control logic of the fixed injector is as follows:

[0015] Based on the target load value, the optimal combination of fixed injectors is selected through a binary combination algorithm, and the remaining load difference is continuously compensated by adjustable injectors.

[0016] Preferably, it also includes a one-way valve to prevent the working medium from flowing backward.

[0017] Preferably, the nozzle throat area of ​​the adjustable injector is adjusted by driving a conical needle via an electric or pneumatic actuator.

[0018] Preferably, the number of fixed injectors n ≥ 1.

[0019] Preferably, the adjustment formula for the target load value is:

[0020]

[0021] Where C is the capacity of the minimum stationary injector, b i ∈{0, 1}: Binary switch state, b i =1 indicates that the i-th fixed injector is activated, Q adjustable The compensation amount for the adjustable injector is 0 ≤ Q. adjustable ≤C

[0022] Preferably, the target load Q is calculated using the capacity of the minimum fixed injector, C = 6.25%Q, as the reference unit. target Convert to integer multiples:

[0023]

[0024] Then, decompose the integer and decimal parts: N = N integer +N decimal ;

[0025] Where, N integer For the integer part, N decimal The fractional part is the decimal part, and 0 ≤ N decimal ≤1;

[0026] As the integer part is converted to a binary combination, N integer Convert to binary number, each bit corresponds to the on / off state of a fixed injector, set from least significant bit to most significant bit, corresponding to injectors with capacities of C, 2C, 4C, and 8C;

[0027] Finally, the remaining load is compensated by the adjustable injector: Q adjustable =N decimal ·C.

[0028] The technical effects and advantages of this invention are as follows:

[0029] 1. By connecting n fixed injectors of different capacities in parallel with one adjustable injector, and configuring the capacities of the fixed injectors in an arithmetic or geometric sequence, and adjusting the nozzle throat area of ​​the adjustable injector to achieve continuous flow control, the system can achieve stepless adjustment within the load range of 0% to 100%. Compared with existing technologies, the adjustment range is wider and the accuracy is higher, which can better adapt to different working conditions.

[0030] 2. A binary combination algorithm is used to select the fixed injector combination, and the remaining load difference is compensated by the adjustable injector. This adjustment logic is clear and efficient, and can quickly and accurately match the target load, reduce energy waste, and thus can accurately activate the corresponding fixed injector under different target loads. The insufficient part is flexibly supplemented by the adjustable injector, which improves the system's response speed and adjustment efficiency.

[0031] 3. By setting a one-way valve, the backflow of the working medium can be effectively prevented, ensuring the stability and safety of the system operation, avoiding damage to the equipment due to backflow of the medium, and extending the service life of the equipment.

[0032] 4. The nozzle throat area of ​​the adjustable injector is adjusted by driving the conical needle with an electric or pneumatic actuator. It is easy to operate, can realize remote control and automatic adjustment, and can adjust the flow rate in real time according to the actual working conditions, thus improving the intelligence of the system. Attached Figure Description

[0033] Figure 1 This is a diagram of the combined injector system of the present invention.

[0034] Figure 2 This is a table showing the corresponding range of adjustment methods for the full heat load range of the combined injector of the present invention. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] As attached Figure 1 The invention illustrates a highly efficient combined injector system that can be steplessly adjusted under a wide load range, comprising four fixed injectors of different capacities, wherein the capacities of the fixed injectors are configured in an arithmetic or geometric sequence, and each fixed injector is controlled to open and close by a solenoid valve.

[0037] An adjustable injector that achieves continuous flow control by adjusting the nozzle throat area;

[0038] The fixed injector and the adjustable injector are connected in parallel, and by combining the flow rates of the fixed injector and the adjustable injector, the system can achieve stepless adjustment within the load range of 0% to 100%.

[0039] Among them, there is one adjustable injector and four fixed injectors of different capacities, such as Figure 1 The numbers are 1 (N0.1), 2 (N0.2), 3 (N0.3), 4 (N0.4), and 5 (N0.5), with the following capacity allocation for each:

[0040] NO.1 (Adjustable): Adjustment range 0-6.25% of rated load (Q);

[0041] NO.2 to NO.5 (stationary): rated capacities are 6.25%Q, 12.5%Q, 25%Q, and 50%Q, respectively.

[0042] Furthermore, the fixed injector is controlled by a solenoid valve to open and close, and only has two states: "on" or "off".

[0043] The adjustable injector achieves a continuous flow output of 0-6.25%Q by adjusting the nozzle throat area with a conical needle.

[0044] Each injector outlet is equipped with a check valve to prevent backflow of the medium, and integrates a PLC or microprocessor to collect load signals in real time and dynamically adjust the injector status.

[0045] The specific adjustment method is as follows:

[0046] Based on the target load value, the optimal combination of fixed injectors is selected using a binary combination algorithm;

[0047] The difference between the total output of the fixed injector combination and the target load is calculated and continuously compensated by an adjustable injector.

[0048] like Figure 2 In the table, when the demand load is 18.75%Q, NO.2 (6.25%Q) and NO.3 (12.5%Q) are turned on;

[0049] When the demand load is 62.5%Q, turn on NO.2 (6.25%Q), NO.4 (25%Q), and NO.5 (50%Q);

[0050] If the target load is 43.75%Q, the fixed combination (NO.2+NO.3+NO.4) outputs 43.75%Q, at which point the adjustable injector is turned off;

[0051] If the target load is 44%Q, the fixed combined output is 43.75%Q, and the remaining 0.25%Q is adjusted and compensated by the adjustable injector.

[0052] Specifically, the adjustment formula for the standard load value is as follows:

[0053]

[0054] Where C is the capacity of the minimum stationary injector, b i ∈{0, 1}: Binary switch state, b i =1 indicates that the i-th fixed injector is activated, Q adjustable The compensation amount for the adjustable injector is 0 ≤ Q. adjustable ≤C.

[0055] Using the minimum fixed injector capacity C = 6.25%Q as the benchmark unit, the target load Q is... target Convert to integer multiples:

[0056]

[0057] Then, decompose the integer and decimal parts: N = N integer +N decimal ;

[0058] Where, N integer For the integer part, N decimal The fractional part is the decimal part, and 0 ≤ N decimal ≤1;

[0059] As the integer part is converted to a binary combination, Ninteger Convert to binary number, each bit corresponds to the on / off state of a fixed injector, set from least significant bit to most significant bit, corresponding to injectors with capacities of C, 2C, 4C, and 8C;

[0060] Finally, the remaining load is compensated by the adjustable injector: Q edjustable =N decimal ·C.

[0061] With a target load of 18.75%Q, the calculation is as follows:

[0062] The binary representation is 0011;

[0063] Turn on NO.2 (6.25%Q) and NO.3 (12.5%Q), the total fixed capacity is 6.25 + 12.5 = 18.75%Q;

[0064] The adjustable injector compensation is 0%Q.

[0065] With a target load of 43.75%Q, the calculation is as follows:

[0066] The binary representation is 0111;

[0067] Turn on NO.2 (6.25% Q), NO.3 (12.5% ​​Q), and NO.4 (25% Q), with a total fixed capacity of 6.25 + 12.5 + 25 = 43.75% Q;

[0068] Adjustable injectors are off.

[0069] With a target load of 44%Q, the calculation is as follows:

[0070] Decompose into N integer =7, N decimal =0.04;

[0071] The fixed combination is NO.2, NO.3, and NO.4, with a total capacity of 43.75%Q;

[0072] Adjustable injector compensation: 0.04 × 6.25 = 0.25%Q.

[0073] In summary, when demand load changes, the combined ejector system needs to be adapted through adjustment. Ejector NO.2 adjusts the nozzle throat area by changing the position of the nozzle cone, thereby regulating the steam flow. Ejectors NO.2 to NO.5, however, only control the on / off state of the working steam via solenoid valves during adjustment (i.e., only open and closed states exist). Figure 2The combined injector configuration in the table, with injectors 2 to 5 combined appropriately, can achieve 15 sets of arithmetic graded adjustments, namely 6.25%, 12.5%, 18.75%, 25%, 31.25%, 37.50%, 43.75%, 50%, 56.25%, 62.50%, 68.75%, 75.00%, 81.25%, 87.50%, and 93.75%. With the participation of the adjustable injector 1, continuous adjustment within the range of 0 to 100% can be achieved.

[0074] Finally, the following points should be noted: First, in the description of this invention, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can refer to mechanical connection or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the object being described changes, the relative positional relationship may change.

[0075] Secondly: The accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other.

[0076] In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency combined injector system capable of stepless adjustment under a wide load range, characterized in that, include: There are n fixed injectors with different capacities, the capacities of which are arranged in an arithmetic or geometric sequence, and each fixed injector is controlled to open and close by a solenoid valve. An adjustable injector that achieves continuous flow control by adjusting the nozzle throat area; The fixed injector and the adjustable injector are connected in parallel, and by combining the flow rates of the fixed injector and the adjustable injector, the system can achieve stepless adjustment within the load range of 0% to 100%.

2. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 1, characterized in that, The capacity configuration of the fixed injectors is a binary proportional sequence, wherein the capacity of the smallest fixed injector is 6.25% of the system rated load, and the capacities of the remaining fixed injectors are 12.5%, 25%, and 50% respectively.

3. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 2, characterized in that, The adjustable injector's adjustment range is from 0 to the minimum capacity value of the fixed injector, used to cover the load gap between two adjacent fixed injector combinations.

4. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 1, characterized in that, The opening and closing control logic of the fixed injector is as follows: Based on the target load value, the optimal combination of fixed injectors is selected through a binary combination algorithm, and the remaining load difference is continuously compensated by adjustable injectors.

5. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 1, characterized in that, It also includes a check valve to prevent the working medium from flowing backward.

6. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 1, characterized in that, The nozzle throat area of ​​the adjustable injector is adjusted by driving a conical needle via an electric or pneumatic actuator.

7. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 1, characterized in that, The number of fixed injectors, n≥1.

8. The high-efficiency combined injector system capable of stepless adjustment under a wide load range according to claim 4, characterized in that, The adjustment formula for the target load value is: Where C is the capacity of the minimum stationary injector, b i ∈{0,1}: Binary switch state, b i =1 indicates that the i-th fixed injector is activated, Q adjustable This is the compensation amount for the adjustable injector, ranging from 0 to Q. adjustable ≤C.

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