Multi-stage fuel oil supply system for combustion test bed

Abstract

The utility model provides a multi-stage fuel oil supply system for a combustion test bed, and aims to solve the problem that oil supply pipelines influence each other due to the fact that multi-stage fuel oil supply of a traditional combustion test bed is connected in parallel in an oil tank and the flow of each pipeline is uncontrollable. The utility model mainly comprises an oil tank and three stages of fuel oil supplies connected with the oil tank, wherein the three stages of fuel oil supplies respectively relate to a main combustion stage nozzle, an on-duty stage nozzle and an igniter; the multi-stage oil supply system can meet the requirement of multi-stage oil supply, the oil supply pipelines do not influence one another, and each stage of channel is provided with an independent variable-frequency oil pump so as to meet the requirements of different working conditions. Each stage of supply system is provided with an independent liquid mass flow controller, so that the fuel flow can be accurately controlled, and the calculation precision of combustion parameters is improved; each channel of the three-stage supply system comprises a one-way valve, so that combustion backfire and fuel oil backflow can be prevented, and equipment is protected; the overflow valves on the branches can prevent the oil pump from reversing, and safe operation of the test bench is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel combustion, in particular to a multi-stage fuel supply system for a combustion test bench. Background Art

[0002] The combustion test bench is mainly used to study the flow and reaction coupling process of fuel nozzles in fuel combustion equipment such as gas turbines, turbochargers, and diesel engines. It is a key research and development platform for iterative optimization of fuel nozzle design. It can simulate various complex operating conditions of nozzles in actual gas turbines or other combustion equipment, conduct research on nozzle aerodynamics, heat transfer and combustion characteristics, and obtain the nozzle's ignition characteristics, emission characteristics, variable operating conditions characteristics, and fuel adaptability.

[0003] Compared with gas combustion, fuel combustion has worse ignition performance and higher requirements for fuel supply stability. Current fuel combustion equipment such as gas turbines, turbochargers, and diesel engines often use multiple groups and multiple fuel nozzles to work simultaneously to increase the workload. This type of fuel nozzle based on lean premixing and preevaporation requires multi-stage fuel supply to ensure stable operation of the equipment from no-load to full-load conditions. The current combustion test bench has multiple stages of fuel supply connected in parallel in one fuel tank. Under this multi-stage fuel supply condition, the flow rate of each stage of fuel supply is uncontrollable, causing the various fuel supply pipelines to affect each other, thus affecting the R&D experiment. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned prior art, the present application provides a multi-stage fuel supply system for a combustion test bench, which can meet the needs of multi-stage fuel supply and the various fuel supply pipelines do not affect each other.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A multi-stage fuel supply system for a combustion test bench comprises a fuel tank and a three-stage fuel supply connected to the fuel tank, the ends of the three-stage fuel supply are a main combustion stage nozzle, a duty stage nozzle and an igniter in sequence, and the components of each stage of the fuel supply include a hand valve, a coarse filter, an oil pump, a fine filter, a pressure sensor and a solenoid valve connected to the fuel tank in sequence.

[0007] Furthermore, the oil pump for supplying the fuel at each stage is a variable frequency oil pump.

[0008] Furthermore, a liquid mass flow controller is connected to the rear end of the fine filter of each stage of the fuel supply. Furthermore, a one-way valve is connected to the rear end of the liquid mass flow controller of each stage of the fuel supply.

[0009] Furthermore, an overflow valve is provided in each stage of the fuel supply, and the overflow valve is connected between the coarse filter and the oil pump.

[0010] The beneficial effects of the utility model are as follows:

[0011] Compared with the prior art, the fuel test bench provided by the utility model has a three-level fuel supply, including a main combustion stage nozzle, a duty stage nozzle and an igniter. Each level of the fuel supply channel includes an independent variable frequency oil pump to adapt to a wider range of working conditions without interfering with each other.

[0012] Compared with the prior art, each level of the fuel supply system of the utility model is equipped with an independent liquid mass flow controller, which can accurately control the fuel flow, thereby improving the calculation accuracy of combustion-related parameters such as air-fuel ratio, combustion efficiency, and main combustion zone temperature.

[0013] Compared with the prior art, the three channels of the multi-stage fuel supply system of the utility model all contain one-way valves to suppress combustion backfire and fuel reflux, which can protect the front-end liquid mass flow controller and variable frequency oil pump and other instrument equipment.

[0014] Compared with the prior art, the three channels of the multi-stage fuel supply system of the utility model all contain overflow valves, which can prevent the oil pump from reversing due to pressure buildup on the test bench / test piece, and automatically open the overflow valve when the oil pressure exceeds a certain threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a system block diagram of the utility model.

[0016] Among them: 1. Fuel tank;

[0017] 210, main combustion stage nozzle; 201, main combustion stage manual valve; 202, main combustion stage coarse filter; 203, main combustion stage overflow valve; 204, main combustion stage variable frequency oil pump; 205, main combustion stage fine filter; 206, main combustion stage liquid mass flow controller; 207, main combustion stage one-way valve; 208, main combustion stage pressure sensor; 209, main combustion stage solenoid valve;

[0018] 310, duty class nozzle; 301, duty class hand valve; 302, duty class coarse filter; 303, duty class overflow valve; 304, duty class variable frequency oil pump; 305, duty class fine filter; 306, duty class liquid mass flow controller; 307, duty class one-way valve; 308, duty class pressure sensor; 309, duty class solenoid valve;

[0019] 410, igniter; 401, ignition stage manual valve; 402, ignition stage coarse filter; 403, ignition stage overflow valve; 404, ignition stage variable frequency oil pump; 405, ignition stage fine filter; 406, ignition stage liquid mass flow controller; 407, ignition stage one-way valve; 408, ignition stage pressure sensor; 409, ignition stage solenoid valve. DETAILED DESCRIPTION

[0020] The specific implementation of the utility model is described below in conjunction with the accompanying drawings.

[0021] The utility model provides a multi-stage fuel supply system for a combustion test bench, aiming to solve the problem that the flow of each stage of pipelines in a traditional combustion test bench is uncontrollable due to the multi-stage fuel supply being connected in parallel in one fuel tank 1, so that each fuel supply pipeline affects each other.

[0022] like Figure 1 As shown, the utility model includes a fuel tank 1 and a three-stage fuel supply connected to the fuel tank 1, the ends of the three-stage fuel supply are a main combustion stage nozzle 210, a duty stage nozzle 310 and an igniter 410 in sequence, and the composition of each stage of fuel supply includes a hand valve, a coarse filter, an oil pump, a fine filter, a pressure sensor and a solenoid valve connected to the fuel tank 1 in sequence.

[0023] In one implementation of the utility model, the oil pump for each stage of fuel supply is a variable frequency oil pump.

[0024] In one embodiment of the utility model, a liquid mass flow controller is also connected to the rear end of the fine filter of each stage of fuel supply.

[0025] In one embodiment of the utility model, a one-way valve is further connected to the rear end of the liquid mass flow controller of each stage of fuel supply.

[0026] In one embodiment of the utility model, an overflow valve is also provided in each stage of fuel supply, and the overflow valve is connected between the coarse filter and the oil pump.

[0027] The specific structure and working principle of the utility model:

[0028] The combustion test bench in this embodiment involves three-stage fuel supply, and the three-stage fuel supply is connected in parallel on the same fuel tank 1 to achieve multi-stage fuel supply.

[0029] Among them, the main combustion stage fuel supply includes a main combustion stage manual valve 201, a main combustion stage coarse filter 202, a main combustion stage overflow valve 203, a main combustion stage variable frequency oil pump 204, a main combustion stage fine filter 205, a main combustion stage liquid mass flow controller 206, a main combustion stage one-way valve 207, a main combustion stage pressure sensor 208 and a main combustion stage solenoid valve 209 which are connected in sequence from the fuel tank 1.

[0030] Among them, the duty class fuel supply includes the duty class manual valve 301, the duty class coarse filter 302, the duty class overflow valve 303, the duty class variable frequency oil pump 304, the duty class fine filter 305, the duty class liquid mass flow controller 306, the duty class one-way valve 307, the duty class pressure sensor 308 and the duty class solenoid valve 309 which are connected in sequence from the fuel tank 1.

[0031] Among them, the fuel supply of the igniter 410 includes an ignition-level manual valve 401, an ignition-level coarse filter 402, an ignition-level overflow valve 403, an ignition-level variable frequency oil pump 404, an ignition-level fine filter 405, an ignition-level liquid mass flow controller 406, an ignition-level one-way valve 407, an ignition-level pressure sensor 408 and an ignition-level solenoid valve 409 which are connected in sequence from the fuel tank 1.

[0032] The number of variable frequency oil pumps in this embodiment is determined according to the burner / nozzle design and the number of fuel levels. Each level of fuel supply channel includes an independent variable frequency oil pump to adapt to a wider range of working conditions without interfering with each other.

[0033] Compared with the prior art, the three liquid mass flow controllers in this embodiment are respectively used to accurately control the flow of the corresponding fuel supply branches. Each level of the fuel supply system is equipped with an independent liquid mass flow controller, which can accurately control the fuel flow, thereby improving the calculation accuracy of combustion-related parameters such as air-fuel ratio, combustion efficiency, and main combustion zone temperature.

[0034] Compared with the prior art, each stage of the fuel supply in this embodiment is equipped with a one-way valve to suppress combustion backfire and fuel reflux, which can protect the front-end liquid mass flow controller and variable frequency oil pump and other instrument equipment.

[0035] Compared with the prior art, each stage of fuel supply in this embodiment includes an overflow valve, which can prevent the oil pump from reversing due to pressure buildup on the test bench / test piece, and automatically open the overflow valve when the oil pressure exceeds a certain threshold.

[0036] During the test, the burner test pieces involved in the combustion test bench include the main combustion stage and the duty stage. A suitable liquid mass flow controller is selected and installed in the system. The manual valve and solenoid valve in the igniter 410 oil circuit are closed, and the mass flow of the main combustion stage and the duty stage are adjusted respectively. After the pressure sensor displays the designed oil supply pressure of the burner, it indicates that the oil pressure before the valve of each level of solenoid valve has reached the specified parameters and the oil supply can be started at any time.

[0037] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A multi-stage fuel supply system for a combustion test bench, characterized in that: The invention comprises a fuel tank (1) and a three-stage fuel supply connected to the fuel tank (1), wherein the ends of the three-stage fuel supply are a main combustion stage nozzle (210), a duty stage nozzle (310) and an igniter (410) in sequence, and each stage of the fuel supply comprises a hand valve, a coarse filter, an oil pump, a fine filter, a pressure sensor and a solenoid valve connected to the fuel tank (1) in sequence.

2. A multi-stage fuel supply system for a combustion test bench as claimed in claim 1, characterized in that: The oil pumps for fuel supply at each stage are variable frequency oil pumps.

3. A multi-stage fuel supply system for a combustion test bench as claimed in claim 1, characterized in that: A liquid mass flow controller is also connected to the rear end of the fine filter of each stage of the fuel supply.

4. A multi-stage fuel supply system for a combustion test bench as claimed in claim 3, characterized in that: A one-way valve is also connected to the rear end of the liquid mass flow controller of each stage of the fuel supply.

5. A multi-stage fuel supply system for a combustion test bench as claimed in claim 1, characterized in that: An overflow valve is also provided in each stage of the fuel supply, and the overflow valve is connected between the coarse filter and the oil pump.

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