A method for nonlinear combustion control of liquid fuels

Abstract

The application discloses a kind of liquid fuel nonlinear combustion control method, by adjusting the flow and frequency of fuel and combustion-supporting gas, control fuel flow and combustion-supporting gas flow present continuous wave function input, make it present nonlinear periodic variation, to ensure that fuel high-efficiency atomization combustion.The application not only can form negative pressure by frequency conversion coupling intensification air convection in furnace, make the temperature in furnace more uniform, also improve the efficiency and stability of fuel combustion, make resource get rational utilization, wherein CO emission reduces 20% to 40%, NO content reduces 10% to 20%, NO X Down 12% to 18%, effectively reduce the emission of pollutants.

Description

Technical Field

[0001] The invention belongs to the field of energy utilization, and in particular relates to a liquid fuel nonlinear combustion control method. Background Art

[0002] Unstable combustion is an issue that needs to be paid attention to in the field of energy utilization. The impacts it produces include furnace vibration, low combustion efficiency, NO X High emissions, high unburned carbon content in flue gas, large heat loss from incomplete combustion, and low combustion efficiency have greatly limited their application.

[0003] At present, in the research on combustion control technology, some studies use continuous combustion control methods to proportionally regulate the flow of fuel and combustion-supporting gas. Although the combustion state is stable at the maximum flow rate, the fuel is not fully utilized, and the burner works poorly when the flow rate is low. Another part of the research uses pulse combustion control methods to control the fuel flow and combustion-supporting gas flow through two working states: full open and full closed. By intensifying air convection during the combustion process, negative pressure is generated in the combustion area, so that the combustion products flow back into the flame for secondary combustion, thereby improving the fuel combustion efficiency. However, drastic changes in air flow will make it difficult to accurately control the flame and temperature field. Summary of the invention

[0004] In view of the problems and shortcomings of the prior art, the invention provides a nonlinear combustion control method for liquid fuel. By adjusting the flow rate and frequency of the fuel and gas, the fuel and combustion-supporting gas flow rates are controlled by sine / cosine wave functions to make them change nonlinearly and periodically, and the valve change frequency is changed in real time to achieve frequency conversion coupling of the fuel flow rate and the combustion-supporting gas flow rate, thereby solving the problems of low fuel combustion efficiency and NO X Problems include high emissions and high unburned carbon content in flue gas.

[0005] The technical solution of the present invention is as follows:

[0006] A liquid fuel nonlinear combustion control method, the method comprising: by adjusting the flow rate and frequency of the fuel and the combustion-supporting gas, performing continuous stable wave function control on the flow rates of the fuel and the combustion-supporting gas, making them change nonlinearly and periodically, realizing frequency conversion coupling of the fuel flow rate and the combustion-supporting gas flow rate, and ensuring efficient atomization combustion of the fuel.

[0007] Furthermore, the method for adjusting the flow rate and frequency of the fuel and the combustion-supporting gas is:

[0008] The flow rate and frequency of fuel and combustion-supporting gas can be adjusted by changing the valve change frequency.

[0009] Furthermore, the stable wave function is a sine / cosine function.

[0010] Furthermore, the nonlinear periodic change is specifically:

[0011] The flow cycle is 0 to 25s, the flow frequency is 0 to 1 / 25Hz, the nonlinear fuel flow range is 130L / min to 200L / min, and the combustion-supporting gas flow range is 100L / min to 180L / min.

[0012] Furthermore, when the fuel flow rate is frequency-coupled with the combustion-supporting gas flow rate, the fuel flow rate and the combustion-supporting gas flow rate have the same frequency, and within a single cycle, the fuel flow rate and the combustion-supporting gas flow rate simultaneously reach a maximum value and a minimum value.

[0013] The present invention also provides a liquid fuel nonlinear combustion control system, comprising:

[0014] A fuel regulating module, used to adjust the flow and frequency of fuel;

[0015] The gas regulating module is used to adjust the flow rate and frequency of the combustion-supporting gas.

[0016] The present invention also provides an electronic device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the liquid fuel nonlinear combustion control method described above.

[0017] The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above-mentioned liquid fuel nonlinear combustion control method when executed by a processor.

[0018] Technical effects of the present invention:

[0019] 1. The present invention adopts a nonlinear combustion control technology solution, which can quickly adjust the combustion state and improve the disadvantage of uneven temperature change. At the same time, it can also intensify the air convection in the combustion chamber to form a negative pressure, so that the combustion products can be burned secondary, effectively improving the fuel utilization rate.

[0020] 2. The present invention adopts a nonlinear combustion control technology solution. Through variable frequency control, the fuel flow rate is coupled with the combustion-supporting gas flow rate. In each cycle, the fuel flow rate and the combustion-supporting gas flow rate simultaneously reach the maximum and minimum values, thereby improving the efficiency and stability of fuel combustion and making rational use of resources. Among them, CO emissions are reduced by 20% to 40%, NO content is reduced by 10% to 20%, and NO X It dropped by 12% to 18%, effectively reducing pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the description and claims, serve to illustrate the embodiments of the invention. Where appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0022] Figure 1 It is a schematic diagram comparing fuel flow rate under nonlinear control and linear control;

[0023] Figure 2 It is a schematic diagram of controlling the fuel flow rate by adjusting the amplitude of the nonlinear function within a period;

[0024] Figure 3 It is a schematic diagram comparing gas flow under nonlinear control and linear control;

[0025] Figure 4 It is a schematic diagram of controlling the gas flow rate by adjusting the amplitude of the nonlinear function within a period;

[0026] Figure 5 It is a schematic diagram of controlling the fuel flow rate by adjusting the frequency of the nonlinear function within the amplitude range;

[0027] Figure 6 It is a schematic diagram of controlling gas flow by adjusting the frequency of nonlinear function within the amplitude range;

[0028] Figure 7 It is a schematic diagram of nonlinear regulation of complementary periodic combustion of fuel flow and combustion-supporting gas flow;

[0029] Figure 8 It is a schematic diagram of nonlinear controlled single-cycle flame combustion;

[0030] Fig. 9 This is a schematic diagram comparing pollutant emissions under nonlinear controlled combustion and linear controlled combustion. DETAILED DESCRIPTION

[0031] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0032] An embodiment of the present invention provides a liquid fuel nonlinear combustion control method, the method comprising: adjusting the flow rate and frequency of the fuel and the combustion-supporting gas, performing continuous stable wave function control on the flow rates of the fuel and the combustion-supporting gas, so that they change nonlinearly periodically, the flow period is 0 to 25s, the flow frequency is 0 to 1 / 25Hz, the nonlinear fuel flow amplitude is 130L / min to 200L / min, and the combustion-supporting gas flow amplitude is 100L / min to 180L / min.

[0033] The frequency conversion coupling of fuel flow and combustion-supporting gas flow is realized to ensure efficient atomization combustion of fuel.

[0034] The method for adjusting the flow rate and frequency of the fuel and the combustion-supporting gas is:

[0035] The flow rate and frequency of fuel and combustion-supporting gas can be adjusted by changing the valve change frequency.

[0036] The stable wave function is a sine / cosine function.

[0037] When the fuel flow rate is frequency-coupled with the combustion-supporting gas flow rate, the fuel flow rate has the same frequency as the combustion-supporting gas flow rate, and the fuel flow rate and the combustion-supporting gas flow rate reach the maximum value and the minimum value at the same time in a single cycle.

[0038] Example 1

[0039] A fuel amplitude control method for nonlinear combustion of liquid fuel, in which the fuel flow rate increases from 130L / min to 200L / min and then decreases to 130L / min according to the controlled sine / cosine function within the cycle, and the flow rate changes first increase and then decrease (such as Figure 1 ); by adjusting the amplitude to change the fuel flow range, the flow rate can be nonlinearly regulated within 200L / min (such as Figure 2 );

[0040] Example 2

[0041] A method for controlling the combustion-supporting gas amplitude of liquid fuel nonlinear combustion, in which the combustion-supporting gas is controlled to increase sinusoidally from 100L / min to 180L / min in a nonlinear period, and then decrease sinusoidally to 100L / min in a continuous combustion mode (such as Figure 3 ); adjust the upper and lower range of the combustion-supporting gas flow rate so that it does not exceed 180L / min (such as Figure 4 );

[0042] Example 3

[0043] A fuel variable frequency control method for nonlinear combustion of liquid fuel. During the fuel combustion process, the frequency of the fuel flow is gradually adjusted from the maximum value to 0, and the amplitude of the fuel flow changes periodically with the sinusoidal function control (such as Figure 5 );

[0044] Example 4

[0045] A variable frequency control method for combustion-supporting gas in nonlinear combustion of liquid fuel. During the fuel combustion process, the frequency of the combustion-supporting gas flow is regulated so that it gradually increases from 0 to a maximum value. The combustion-supporting gas flow changes periodically with the sinusoidal function control (e.g. Figure 6 );

[0046] Example 5

[0047] A method for controlling the frequency conversion coupling of fuel and combustion-supporting gas for nonlinear combustion of liquid fuel. During the fuel combustion process, the fuel flow rate and the combustion-supporting gas flow rate are controlled to change speed and frequency simultaneously, so as to achieve a nonlinear regulation mode of complementary periodic combustion of fuel and combustion-supporting gas (such as Figure 7 ).

[0048] The present invention also provides a liquid fuel nonlinear combustion control system, comprising:

[0049] A fuel regulating module, used to adjust the flow and frequency of fuel;

[0050] The gas regulating module is used to adjust the flow rate and frequency of the combustion-supporting gas.

[0051] The present invention also provides an electronic device, comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the liquid fuel nonlinear combustion control method described above.

[0052] The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program implements the above-mentioned liquid fuel nonlinear combustion control method when executed by a processor.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid fuel nonlinear combustion control method, characterized in that: The method comprises: adjusting the flow rate and frequency of the fuel and the combustion-supporting gas, performing continuous stable wave function control on the flow rates of the fuel and the combustion-supporting gas, presenting nonlinear periodic changes, realizing frequency conversion coupling of the fuel flow rate and the combustion-supporting gas flow rate, and ensuring efficient atomization combustion of the fuel.

2. The liquid fuel nonlinear combustion control method according to claim 1, characterized in that: The method for adjusting the flow rate and frequency of the fuel and the combustion-supporting gas is: The flow rate and frequency of fuel and combustion-supporting gas can be adjusted by changing the valve change frequency.

3. The liquid fuel nonlinear combustion control method according to claim 1, characterized in that: The stable wave function is a sine / cosine function.

4. The liquid fuel nonlinear combustion control method according to claim 1, characterized in that: The nonlinear periodic variation is specifically: The flow cycle is 0 to 25s, the flow frequency is 0 to 1 / 25Hz, the nonlinear fuel flow range is 130L / min to 200L / min, and the combustion-supporting gas flow range is 100L / min to 180L / min.

5. The liquid fuel nonlinear combustion control method according to claim 1, characterized in that: When the fuel flow rate is frequency-coupled with the combustion-supporting gas flow rate, the fuel flow rate has the same frequency as the combustion-supporting gas flow rate, and the fuel flow rate and the combustion-supporting gas flow rate reach the maximum value and the minimum value at the same time in a single cycle.

6. A liquid fuel nonlinear combustion control system, characterized in that: include: A fuel regulating module, used to adjust the flow and frequency of fuel; The gas regulating module is used to adjust the flow rate and frequency of the combustion-supporting gas.

7. An electronic device, characterized in that: The electronic device comprises a memory and a processor, wherein the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to perform the liquid fuel nonlinear combustion control method according to any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The device stores a computer program, which, when executed by a processor, implements the liquid fuel nonlinear combustion control method according to any one of claims 1 to 5.

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