Combustion device for testing laminar premixed flame combustion process of liquid fuel

Abstract

The invention is suitable for the technical field of combustion devices, and provides a liquid fuel laminar premixed flame combustion process test combustion device, which comprises a supporting mechanism, the liquid fuel propelling mechanism is used for realizing accurate propelling and stable supply of liquid fuel; the liquid fuel atomizing mechanism is used for atomizing liquid fuel to form atomized particles; the heat preservation system is used for preventing the atomized fuel from being liquefied again; the temperature control system is used for accurately controlling the temperature of the heat preservation system; the laminar flow premixing combustor is used for achieving stable and continuous combustion of atomized liquid fuel laminar flow flames. According to the invention, the liquid fuel can be fully atomized, stable and continuous combustion flames can be formed in the laminar flow premixing burner of the basic combustion device, and the combustion test of the laminar flow flame basic combustion characteristics of the liquid fuels with different molecular structures can be carried out based on the laminar flow premixing burner; and an important fundamental research device is provided for revealing the basic combustion characteristics and properties of the liquid fuel.

Description

Technical Field

[0001] The invention belongs to the technical field of combustion devices, and in particular relates to a combustion device for testing a liquid fuel laminar premixed flame combustion process. Background Art

[0002] Ammonia, a fuel with a hydrogen content of 17.8%, can be liquefied at room temperature (10 bar) or atmospheric pressure (-33.4°C), making it easy to store and transport, making it an ideal hydrogen energy carrier. However, ammonia combustion presents challenges such as high laminar flame speed, poor flame stability, and high ignition energy. In practical applications, blending ammonia with small amounts of readily available, carbon-neutral, and readily available fuels such as alcohols, ethers, and esters can effectively promote the widespread application of ammonia fuel. Previously, research on the basic combustion characteristics of ammonia and alcohol, ether, and ester fuels was crucial. However, most burners currently available on the market are designed for studying the laminar flame characteristics of gaseous fuels. Relatively few burners are designed for studying liquid fuels, and most are expensive commercial off-the-shelf equipment. For studying the basic combustion characteristics of liquid fuels, it is crucial to explore the combustion mechanism and fundamental combustion laws of liquid fuels under fully atomized combustion conditions. In light of this, the present invention proposes a combustion device for testing the laminar premixed flame combustion process of liquid fuels, aiming to provide an effective research tool for studying the basic combustion characteristics of liquid fuels and hydrogen-blended fuels. Summary of the Invention

[0003] The purpose of the present invention is to provide a liquid fuel laminar premixed flame combustion process testing combustion device, aiming to solve the problems raised in the above background technology.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A combustion device for testing a liquid fuel laminar premixed flame combustion process, comprising a support mechanism, a liquid fuel propulsion mechanism, a liquid fuel atomization mechanism, a heat preservation system, a temperature control system, and a laminar premixed burner;

[0006] The support mechanism is used to integrate the liquid fuel propulsion mechanism, the liquid fuel atomization mechanism and the laminar premixing burner;

[0007] The liquid fuel propulsion mechanism is used to achieve precise propulsion and stable supply of liquid fuel, and the liquid fuel propulsion mechanism and the liquid fuel atomization mechanism are sealedly connected through a ferrule structure;

[0008] The liquid fuel atomizing mechanism is used to atomize the liquid fuel into atomized particles, and the liquid fuel atomizing mechanism is softly connected to the laminar premixing burner through a clamping sleeve structure;

[0009] The insulation system is wrapped around the section from the outlet of the liquid fuel atomization mechanism to the inlet of the laminar premixing burner, and is used to prevent the atomized fuel from re-liquefying;

[0010] The temperature control system is used to accurately control the temperature of the insulation system;

[0011] The laminar premix burner is used to achieve stable and continuous combustion of a laminar flame of atomized liquid fuel.

[0012] Furthermore, the supporting mechanism includes a burner bracket and an integrated platform, the burner bracket is installed on the integrated platform, and the laminar premixed burner is installed on the burner bracket.

[0013] Furthermore, the liquid fuel propulsion mechanism includes a stepper motor, a guide rail and a metal syringe. The guide rail is fixed to an integrated platform. The stepper motor drives the slider of the guide rail to move linearly along the guide rail. The slider is rigidly connected to the piston push rod of the metal syringe to promote the precise delivery of liquid fuel.

[0014] Furthermore, the liquid fuel atomization mechanism includes a thin metal tube, a carrier gas inlet and a conical atomization structure. The metal syringe outlet is sealed and connected to the thin metal tube through a ferrule. The thin metal tube is coaxially inserted into the center of the conical atomization structure. The flow channel of the conical atomization structure is a tapered design. The carrier gas enters the tapered flow channel from the carrier gas inlet and is accelerated to break the liquid fuel into atomized particles.

[0015] Furthermore, the heat preservation system is connected to a temperature control system to control the temperature between the evaporation point and the ignition point of the liquid fuel.

[0016] Furthermore, the laminar premixing burner includes a mixed gas heat-insulating mixing chamber and an anti-backfire nozzle, and is equipped with a gas supply control system to ensure the supply of combustion gas.

[0017] A method for testing a combustion device according to the above-mentioned liquid fuel laminar premixed flame combustion process comprises the following steps:

[0018] The stepper motor drives the slider of the guide rail, which drives the piston push rod of the metal syringe to move and push the liquid fuel into the thin metal tube; the carrier gas enters the conical atomization structure from the carrier gas inlet, and is accelerated by the tapered flow channel to break the liquid fuel into atomized particles; the insulation system maintains the temperature to prevent the liquid fuel from re-liquefying after atomization; the atomized liquid fuel is mixed with the combustion-supporting gas in the laminar premixing burner, and a stable laminar flame is formed through the anti-backfire nozzle to achieve combustion.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The liquid fuel laminar premixed flame combustion process testing combustion device proposed in the present invention can achieve sufficient atomization of the liquid fuel and form a stable and continuous combustion flame in the laminar premixed burner of the basic combustion device. Based on this burner, combustion tests on the basic combustion characteristics of laminar flames of liquid fuels with different molecular structures can be carried out, providing an important basic research device for revealing the basic combustion characteristics of liquid fuels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the combustion device for testing the liquid fuel laminar premixed flame combustion process.

[0022] In the figure: 1-stepping motor; 2-guide rail; 3-metal syringe; 4-thin metal tube; 5-carrier gas inlet; 6-conical atomization structure; 7-laminar premixing burner; 8-burner bracket; 9-integrated platform. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, objectives and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be understood as limiting the scope of implementation of the present invention.

[0024] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0025] like Figure 1 As shown, one embodiment of the present invention provides a combustion device for testing the laminar flow premixed flame combustion process of liquid fuel, which can realize the research of the combustion characteristics of liquid fuel laminar flow flame. The device includes a support mechanism, a liquid fuel propulsion mechanism, a liquid fuel atomization mechanism, a heat preservation system, a temperature control system, and a laminar flow premixed burner 7;

[0026] The support mechanism includes a burner bracket 8 and an integrated platform 9, which is used to integrate the liquid fuel propulsion mechanism, the liquid fuel atomization mechanism and the laminar premixing burner 7 to form an integrated basic combustion test platform. The liquid fuel propulsion mechanism is used to achieve precise propulsion and stable supply of liquid fuel. The liquid fuel atomization mechanism is used to atomize the liquid fuel from the liquid fuel propulsion mechanism to form fine atomized particles that can flow with the gas. The liquid fuel propulsion mechanism and the liquid fuel atomization mechanism are sealed by a ferrule structure, and the liquid fuel atomization mechanism and the laminar premixing burner 7 are also softly connected by a ferrule structure.

[0027] The liquid fuel propulsion mechanism consists of a stepper motor 1, a guide rail 2, and a metal injector 3. The guide rail 2 is fixed to an integrated platform 9. When the stepper motor 1 is activated, it drives the slider of the guide rail 2 to move linearly along the guide rail 2. The slider is rigidly connected to the piston push rod of the metal injector 3. The slider then drives the piston push rod of the metal injector 3 to move, accurately pushing the liquid fuel into the metal injector 3. After calibration, precise propulsion and stable supply of liquid fuel are achieved.

[0028] The liquid fuel atomization mechanism comprises a thin metal tube 4, a carrier gas inlet 5, and a tapered atomization structure 6. The outlet of the metal syringe 3 is sealed to the thin metal tube 4 via a ferrule. The thin metal tube 4 is coaxially inserted into the center of the tapered atomization structure 6, which has a tapered flow path. Liquid fuel from the metal syringe 3 is delivered to the end through the thin metal tube 4. After entering through the carrier gas inlet 5, the carrier gas flows along the tapered flow path. Due to the tapered flow path, the gas flow rate increases rapidly. At the end of the thin metal tube, the high-speed carrier gas breaks the liquid fuel into fine atomized particles that can flow with the gas.

[0029] The heat preservation system is wrapped around the section from the outlet of the liquid fuel atomization mechanism to the inlet of the laminar premixing burner 7, and is used to heat the atomized liquid fuel and prevent the atomized fuel from re-liquefying.

[0030] The temperature control system is matched with the heat preservation system to realize accurate temperature control of the heat preservation system.

[0031] The laminar premixing burner 7 is composed of a mixed gas heat-insulating mixing chamber and an anti-backfire nozzle. The laminar premixing burner 7 is installed on a burner bracket 8, and the burner bracket 8 is installed on an integrated platform 9. The laminar premixing burner 7 realizes stable and continuous combustion of a laminar flame of the atomized liquid fuel. The laminar premixing burner 7 is equipped with a gas supply control system to ensure the supply of gas required for combustion.

[0032] In the embodiment of the present invention, the use process of the device is as follows:

[0033] First, install the stepper motor 1, guide rail 2 and metal syringe 3, and calibrate the function between the propulsion rate and the injection volume of the metal syringe 3 based on a precision electronic balance; then seal the outlet of the metal syringe 3 with the thin metal tube 4 through a ferrule, coaxially insert the thin metal tube 4 into the conical atomization structure 6, and then connect the carrier gas pipeline to the carrier gas inlet 5 to complete the installation of the liquid fuel atomization mechanism, and calibrate the functional relationship between the carrier gas flow rate and the atomization volume; then install the insulation system from the outlet of the liquid fuel atomization mechanism to the inlet section of the laminar premixed burner 7, and connect the temperature control system to achieve precise temperature control of the entire insulation system. On this basis, different temperatures can be set for precise temperature control of different liquid fuels between the evaporation point and the ignition point, to prevent the liquid fuel from re-liquefying due to low temperature after atomization and to avoid the liquid fuel from burning due to high temperature; finally, install the laminar premixed burner 7 on the burner bracket 8 and connect the gas supply control system to achieve stable and continuous combustion of the liquid fuel laminar premixed flame, and carry out testing and research on the liquid fuel laminar premixed flame combustion process.

[0034] The working principle of the device is as follows:

[0035] The stepper motor 1 drives the slider of the guide rail 2, which drives the piston push rod of the metal syringe 3 to move, and accurately pushes the liquid fuel to the thin metal tube 4 according to the calibration function relationship; the carrier gas enters the conical atomization structure 6 from the carrier gas inlet 5, and after being accelerated through the tapered flow channel, the shear force and Venturi effect are used at the end of the thin metal tube 4 to break the liquid fuel into fine atomized particles that can flow with the gas; the insulation system maintains the temperature to prevent the liquid fuel from re-liquefying after atomization. The atomized liquid fuel and the combustion-supporting gas are fully mixed in the laminar premixed burner 7, and a stable laminar flame is formed through the anti-backfire nozzle to achieve controllable combustion.

[0036] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention. These should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A liquid fuel laminar premixed flame combustion process test combustion device, characterized in that: It includes a supporting mechanism, a liquid fuel propulsion mechanism, a liquid fuel atomization mechanism, a heat preservation system, a temperature control system and a laminar premix burner; The support mechanism is used to integrate the liquid fuel propulsion mechanism, the liquid fuel atomization mechanism and the laminar premixing burner; The liquid fuel propulsion mechanism is used to achieve precise propulsion and stable supply of liquid fuel, and the liquid fuel propulsion mechanism and the liquid fuel atomization mechanism are sealedly connected through a ferrule structure; The liquid fuel atomizing mechanism is used to atomize the liquid fuel into atomized particles, and the liquid fuel atomizing mechanism is softly connected to the laminar premixing burner through a clamping sleeve structure; The insulation system is wrapped around the section from the outlet of the liquid fuel atomization mechanism to the inlet of the laminar premixing burner, and is used to prevent the atomized fuel from re-liquefying; The temperature control system is used to accurately control the temperature of the insulation system; The laminar premix burner is used to achieve stable and continuous combustion of a laminar flame of atomized liquid fuel.

2. The liquid fuel laminar premixed flame combustion process test combustion device according to claim 1, characterized in that: The supporting mechanism includes a burner bracket and an integrated platform. The burner bracket is installed on the integrated platform, and the laminar premixed burner is installed on the burner bracket.

3. The liquid fuel laminar premixed flame combustion process test combustion device according to claim 2, characterized in that: The liquid fuel propulsion mechanism includes a stepper motor, a guide rail and a metal syringe. The guide rail is fixed to an integrated platform. The stepper motor drives the slider of the guide rail to move linearly along the guide rail. The slider is rigidly connected to the piston push rod of the metal syringe to promote the precise delivery of liquid fuel.

4. The liquid fuel laminar premixed flame combustion process test combustion device according to claim 3, characterized in that: The liquid fuel atomization mechanism includes a thin metal tube, a carrier gas inlet and a conical atomization structure. The metal syringe outlet is sealed and connected to the thin metal tube through a ferrule. The thin metal tube is coaxially inserted into the center of the conical atomization structure. The flow channel of the conical atomization structure is a tapered design. The carrier gas enters the tapered flow channel from the carrier gas inlet and is accelerated to break the liquid fuel into atomized particles.

5. The liquid fuel laminar premixed flame combustion process test combustion device according to claim 1, characterized in that: The heat preservation system is matched with the temperature control system and is used to control the temperature between the evaporation point and the ignition point of the liquid fuel.

6. The liquid fuel laminar premixed flame combustion process test combustion device according to claim 1, characterized in that: The laminar premixing burner includes a mixed gas heat-insulating mixing chamber and an anti-backfire nozzle, and is equipped with a gas supply control system to ensure the supply of combustion gas.

7. A method for operating the combustion device for testing the liquid fuel laminar premixed flame combustion process according to any one of claims 1 to 6, characterized in that: The following steps are involved: The stepper motor drives the slider of the guide rail, which drives the piston push rod of the metal syringe to move and push the liquid fuel into the thin metal tube; the carrier gas enters the conical atomization structure from the carrier gas inlet, and is accelerated by the tapered flow channel to break the liquid fuel into atomized particles; the insulation system maintains the temperature to prevent the liquid fuel from re-liquefying after atomization; the atomized liquid fuel is mixed with the combustion-supporting gas in the laminar premixing burner, and a stable laminar flame is formed through the anti-backfire nozzle to achieve combustion.

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