Electric flame stove with low nitrogen oxide emission and operation method thereof

Abstract

The invention relates to the technical field of electric flame stoves, in particular to an electric flame stove with low nitrogen oxide emission and an operation method of the electric flame stove. According to the technical scheme, the device comprises a gas supply unit, a discharge cooking range and a plasma power supply and is used for preparing and supplying high-purity nitrogen; the discharge cooking range is communicated with the gas supply unit and is used for receiving the high-purity nitrogen as working gas; and the plasma power supply is electrically connected with the discharge cooking range and is used for providing discharge electric energy for the discharge cooking range. According to the invention, high-purity nitrogen is used as a discharge medium instead of air, so that the generation of nitrogen oxides and ozone is inhibited from the source, and the pollutant discharge is obviously reduced; meanwhile, the system is highly compatible with an existing cooking range structure, and can adapt to various discharge forms without modification; the air compressor, the nitrogen making machine, the power supply and other components are integrated in the stove body, so that the miniaturization and integration of the equipment are realized; and in cooperation with gas storage pressure stabilization and flow regulation control, the stability of system operation and the simplicity and convenience of operation are ensured.

Description

Technical Field

[0001] This invention relates to the field of electric flame stove technology, and in particular to an electric flame stove with low nitrogen oxide emissions and its operating method. Background Technology

[0002] An electric flame stove (also known as an electric fire stove, electric fire generator, plasma stove, etc.) is a new type of kitchen heating device that uses electrical energy to directly generate a high-temperature plasma flame. Its basic principle is to establish a strong electric field between specific electrode structures using a high-voltage power supply, which breaks down the flowing gas medium (usually air), causing the gas molecules to ionize and form plasma. This plasma jet can reach temperatures above 1000 degrees Celsius and can be directly used for cooking, offering advantages such as instant use, high thermal efficiency, and no need for traditional fuels.

[0003] However, existing electric flame stoves that use air as the working gas have a significant environmental and health hazard in practical applications: in the high-temperature environment of air plasma discharge, nitrogen (N2) and oxygen (O2) in the air undergo a chemical reaction to generate a series of nitrogen oxides (NOx, mainly including NO and NO2). NOx is a recognized air pollutant that not only irritates the human respiratory tract and causes or exacerbates respiratory diseases, but is also an important precursor to photochemical smog and acid rain. Therefore, this application proposes an electric flame stove with low nitrogen oxide emissions and its operating method. Summary of the Invention

[0004] The purpose of this invention is to address the issue that traditional air-based electric flame stoves in the background technology generally produce NOx emissions of 600-2000 ppm during operation, far exceeding the national standard limits for household gas stoves. This severely restricts the market promotion and application of this technology and does not meet the current requirements for the development of green and healthy kitchen appliances. The invention proposes an electric flame stove with low nitrogen oxide emissions and its operating method.

[0005] In a first aspect, this application provides an electric flame stove with low nitrogen oxide emissions, comprising:

[0006] A gas supply unit for preparing and supplying high-purity nitrogen gas;

[0007] The discharge burner head is connected to the gas supply unit and is used to receive the high-purity nitrogen gas as the working gas;

[0008] A plasma power supply is electrically connected to the discharge burner head and is used to provide discharge power to the discharge burner head.

[0009] The gas supply unit, the discharge burner head, and the plasma power supply are integrated into the burner body; the high-purity nitrogen gas is ionized in the discharge burner head to form high-temperature plasma.

[0010] Optionally, the gas supply unit includes an air compressor and a nitrogen generator connected in sequence;

[0011] The air compressor is used to provide compressed air;

[0012] The nitrogen generator is used to separate the high-purity nitrogen from the compressed air and deliver it to the discharge stove head.

[0013] Optionally, the gas supply unit further includes:

[0014] An oil-water filter is connected between the air compressor and the nitrogen generator to purify the compressed air;

[0015] A gas storage tank, connected to the outlet of the nitrogen generator, is used to buffer and store the high-purity nitrogen gas.

[0016] A gas regulating valve is installed on the pipeline connecting the gas storage tank and the discharge burner head, and is used to regulate the flow rate of nitrogen gas to the discharge burner head.

[0017] Optionally, the nitrogen generator is a nitrogen generation device that uses the molecular sieve adsorption principle or the membrane separation principle.

[0018] Optionally, the purity of the high-purity nitrogen gas is not less than 95%.

[0019] Secondly, this application provides a method for operating a low-NOx emission electric flame stove as described in the first aspect, comprising the following steps:

[0020] S1. Start the gas supply unit to prepare high-purity nitrogen and store it in the gas storage tank;

[0021] S2. Monitor the pressure inside the gas storage tank. When it reaches the preset working pressure range, open the gas regulating valve to supply nitrogen to the discharge stove head.

[0022] S3. Start the plasma power supply to generate a plasma flame in the high-purity nitrogen atmosphere.

[0023] S4. Based on the discharge state of the plasma power source, adjust the nitrogen supply flow rate to a matching state through the gas regulating valve.

[0024] Optionally, in step S1, starting the gas supply unit specifically involves starting the air compressor and the nitrogen generator in sequence.

[0025] Optionally, in step S2, the preset working pressure range is 0.5MPa to 1.0MPa.

[0026] Optionally, after step S4, a shutdown procedure may also be included:

[0027] S5. First, turn off the plasma power supply, and then turn off the gas regulating valve;

[0028] S6. After the pressure inside the gas storage tank rises back to the preset shutdown pressure, shut down the gas supply unit.

[0029] Compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0030] By using nitrogen with a purity of ≥95% as the discharge medium, the oxygen content in the discharge environment is significantly reduced from the source, thereby effectively inhibiting the generation of nitrogen oxides (NOx) and making the emission concentration much lower than that of traditional electric flame stoves that use air as the working gas, while also reducing the generation of ozone (O3).

[0031] This invention does not require structural modifications to the existing electric flame stove's discharge head. It achieves low emissions simply by providing high-purity nitrogen as the gas source, and is applicable to stove heads with various discharge methods, demonstrating good versatility.

[0032] Key components such as the air compressor, nitrogen generator, and plasma power supply are all built into the cooktop, resulting in a compact structure that is easy to install and use, in line with the integrated design trend of household kitchen appliances.

[0033] By combining the gas storage tank and the regulating valve, the nitrogen supply can be stably regulated and matched with the plasma discharge power. The system start-up and shutdown process is clear, which is convenient for user operation and automatic control.

[0034] In summary, this invention, by using high-purity nitrogen instead of air as the discharge medium, suppresses the generation of nitrogen oxides and ozone at the source, significantly reducing pollutant emissions. Simultaneously, the system exhibits strong compatibility with existing stove structures, adapting to various discharge methods without modification. By integrating components such as the air compressor, nitrogen generator, and power supply into the stove body, miniaturization and integration of the equipment are achieved. Furthermore, the combination of gas storage pressure stabilization and flow regulation control ensures system stability and ease of operation. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of an electric flame stove with low nitrogen oxide emissions.

[0036] Attached reference numerals: 1. Air compressor; 2. Oil-water filter; 3. Nitrogen generator; 4. Gas storage tank; 5. Stove body; 6. Discharge burner head; 7. Gas regulating valve; 8. Plasma power supply. Detailed Implementation

[0037] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0038] See the example. Figure 1 The present invention provides an electric flame stove with low nitrogen oxide emissions, the specific implementation of which is as follows:

[0039] System Composition and Connections: The electric flame stove comprises an air compressor 1, an oil-water filter 2, a nitrogen generator 3, a gas storage tank 4, a stove body 5, an electric burner head 6, a gas regulating valve 7, and a plasma power supply 8. All components are integrated within the stove body 5, forming a unified structure. The outlet of the air compressor 1 is connected to the inlet of the oil-water filter 2 via a pipe. The outlet of the oil-water filter 2 is connected to the inlet of the nitrogen generator 3 for purifying the compressed air by removing oil and water. The nitrogen outlet of the nitrogen generator 3 is connected to the inlet of the gas storage tank 4 for storing the produced high-purity nitrogen. The outlet of the gas storage tank 4 is connected to the gas inlet of the electric burner head 6 via a gas supply pipe, on which a gas regulating valve 7 is installed to adjust the nitrogen flow rate. The output electrode of the plasma power supply 8 is electrically connected to the discharge electrode of the electric burner head 6, providing it with high-voltage electrical energy.

[0040] In this embodiment, the nitrogen generator 3 uses molecular sieve air separation (PSA) or membrane air separation technology to separate nitrogen from the air. The purity of the nitrogen produced is not less than 95% (volume fraction).

[0041] Among them, the discharge burner 6 is a plasma discharge burner, and the only working gas used when it is working is nitrogen gas with a purity of ≥95% from the gas storage tank 4.

[0042] In addition, the gas storage tank 4 is used to buffer and store nitrogen, and its design working pressure range covers 0.5MPa to 1.0MPa and above.

[0043] It is worth noting that the air compressor 1 provides the clean compressed air source required for nitrogen production. The plasma power source 8 is a high-voltage power source capable of generating enough to break down the nitrogen and form a stable plasma arc.

[0044] This invention also provides a method for operating a low-NOx emission electric flame stove, the specific operating process of which is as follows:

[0045] System Start-up and Nitrogen Preparation: Upon initial or routine startup, first turn on air compressor 1 and nitrogen generator 3. Air compressor 1 draws in ambient air and compresses it. The compressed air is purified by oil-water filter 2 before entering nitrogen generator 3. Nitrogen generator 3 continuously separates nitrogen gas with a purity ≥95% and delivers it to storage tank 4.

[0046] Gas supply and flow pre-adjustment: Observe or monitor the pressure inside the gas storage tank 4 using a pressure sensor. When the pressure inside the gas storage tank 4 rises to the preset working pressure range between 0.5 MPa and 1.0 MPa, open the gas regulating valve 7. Through the gas regulating valve 7, the nitrogen flow rate to the electric burner head 6 is initially adjusted to the design rated flow rate of this burner model.

[0047] Plasma ignition and operating condition optimization: When the plasma power supply 8 is turned on, high voltage is applied to the electrodes of the discharge burner head 6, breaking down the flowing high-purity nitrogen gas and generating a high-temperature plasma flame, which can be used for cooking. Subsequently, based on the actual discharge power, flame shape, and stability of the plasma power supply 8, the opening of the gas regulating valve 7 is finely adjusted to regulate the nitrogen flow rate to the optimal flow rate that matches the current discharge power, so as to achieve efficient and stable heating effect.

[0048] System shutdown: When shutdown is required, the operation sequence is as follows:

[0049] a. First, turn off the plasma power supply 8, and the discharge burner 6 will stop generating plasma flame.

[0050] b. Then close the gas regulating valve 7 to cut off the nitrogen supply to the discharge burner 6.

[0051] c. At this time, nitrogen generator 3 is still running, continuing to fill nitrogen into gas storage tank 4. When the pressure inside gas storage tank 4 rises to approximately 1.0 MPa (or the system's set shutdown pressure), shut down air compressor 1 and nitrogen generator 3, and the system completely stops operating. This step helps maintain pressure in the gas storage tank, creating conditions for quickly establishing working pressure for the next startup.

[0052] It is worth noting that traditional electric flame stoves use air as their working gas. Under high-temperature plasma discharge conditions, the nitrogen and oxygen in this air inevitably undergo an oxidation reaction, generating nitrogen oxides (NOx). To suppress this reaction at its source, this invention employs a built-in nitrogen generation system. High-purity nitrogen (≥95%) is extracted from the air using molecular sieve or membrane separation technology, thereby reducing the oxygen content in the discharge environment to extremely low levels. When high-purity nitrogen is delivered to the burner head as the sole working medium and ionized under the influence of the plasma power source, the lack of sufficient oxygen to participate in the reaction effectively blocks the formation pathway of nitrogen oxides. Simultaneously, the system stabilizes the gas pressure through a gas storage tank and precisely controls the nitrogen flow rate through a regulating valve to match the discharge power, optimizing gas utilization efficiency while ensuring stable plasma formation. This technical solution does not require changes to the burner head's structure; it achieves low emissions simply by replacing the working gas composition, thus directly and significantly reducing NOx and ozone emissions during the operation of the electric flame stove while ensuring compatibility.

[0053] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A low nitrogen oxide emission electric flame burner characterized by, include: A gas supply unit for preparing and supplying high-purity nitrogen gas; The discharge burner (6) is connected to the gas supply unit and is used to receive the high-purity nitrogen as the working gas. The plasma power supply (8) is electrically connected to the discharge burner (6) and is used to provide discharge power to the discharge burner (6); The gas supply unit, the discharge burner (6), and the plasma power supply (8) are integrated within the burner body (5); the high-purity nitrogen is ionized within the discharge burner (6) to form high-temperature plasma.

2. A low NOx electric flame as claimed in claim 1, wherein, The gas supply unit includes an air compressor (1) and a nitrogen generator (3) connected in sequence. The air compressor (1) is used to provide compressed air; The nitrogen generator (3) is used to separate the high-purity nitrogen from the compressed air and deliver it to the discharge stove (6).

3. The electric flame stove with low nitrogen oxide emissions according to claim 2, characterized in that, The gas supply unit also includes: An oil-water filter (2) is connected between the air compressor (1) and the nitrogen generator (3) to purify the compressed air; A gas storage tank (4) is connected to the outlet of the nitrogen generator (3) and is used to buffer and store the high-purity nitrogen. A gas regulating valve (7) is installed on the pipeline connecting the gas storage tank (4) and the discharge burner (6) to regulate the flow rate of nitrogen gas to the discharge burner (6).

4. The electric flame stove with low nitrogen oxide emissions according to claim 1, characterized in that, The nitrogen generator (3) is a nitrogen generation device that uses the molecular sieve adsorption principle or the membrane separation principle.

5. The electric flame stove with low nitrogen oxide emissions according to claim 1, characterized in that, The purity of the high-purity nitrogen gas is not less than 95%.

6. A method for operating a low-NOx emission electric flame stove as described in claim 3, characterized in that, Includes the following steps: S1. Start the gas supply unit to prepare high-purity nitrogen and store it in the gas storage tank (4); S2. Monitor the pressure inside the gas storage tank (4). When it reaches the preset working pressure range, open the gas regulating valve (7) to supply nitrogen to the discharge stove (6). S3. Start the plasma power supply (8) to make the discharge burner (6) generate a plasma flame in the high-purity nitrogen atmosphere; S4. According to the discharge state of the plasma power supply (8), adjust the nitrogen supply flow rate to the matching state through the gas regulating valve (7).

7. The electric flame stove with low nitrogen oxide emissions according to claim 1, characterized in that, In step S1, starting the gas supply unit specifically involves starting the air compressor (1) and the nitrogen generator (3) in sequence.

8. The electric flame stove with low nitrogen oxide emissions according to claim 1, characterized in that, In step S2, the preset working pressure range is 0.5MPa to 1.0MPa.

9. The electric flame stove with low nitrogen oxide emissions according to claim 1, characterized in that, Following step S4, a shutdown procedure is also included: S5. First, turn off the plasma power supply (8), and then turn off the gas regulating valve (7). S6. After the pressure inside the gas storage tank (4) rises back to the preset shutdown pressure, shut down the gas supply unit.

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