Fuel oil burner

Abstract

The utility model discloses a fuel oil burner which comprises a burner body, an oil way, a monitoring control system and a valve assembly comprising a constant resistance valve and a back pressure valve, the monitoring control system comprises a flow regulating valve, an oil pump, a pressure sensor and a controller, and an oil inlet hole of the burner body is connected with an oil source through a first oil way. An oil pump and a constant resistance valve are sequentially installed on the first oil way in the flowing direction, the position, close to an oil inlet hole of the constant resistance valve, of the first oil way is connected with an oil source through a second oil way, and a pressure sensor, a flow adjusting valve and a back pressure valve used for setting the pressure of the minimum fire of the combustor are sequentially installed on the second oil way in the flowing direction. The controller obtains oil pressure to control the opening degree of the flow adjusting valve and start and stop of the oil pump. The constant resistance valve and the back pressure valve are combined, the requirement for the adjusting precision of the flow adjusting valve is lowered, the fuel oil amount is accurately controlled, oil supply stability is guaranteed, and therefore the stability of flames on the burner body is guaranteed, and the influence of an oil pump is reduced.

Description

Technical Field

[0001] The utility model relates to a burner, and more particularly to a fuel burner. Background Art

[0002] At present, the fuel burners of asphalt mixing plants basically use oil pump variable frequency control technology, such as Figure 1 As shown in the figure, the oil pump variable frequency control technology has the advantages of good control accuracy and convenient adjustment. However, the equipment using this oil pump variable frequency control technology has poor flame stability in the low frequency band. Moreover, since the operating frequency has a lower limit when the oil pump is controlled by variable frequency, and the upper limit is limited by the maximum output frequency of the equipment, it is difficult for the equipment load regulation ratio to meet the target of 1:10. For example, the lower limit of the frequency is 7Hz, and the maximum output frequency is 45Hz, 7 / 45=1:6.4. Therefore, once the oil pump is worn or corroded, the lower limit of the operating frequency needs to be increased to further limit the load regulation ratio. Moreover, when the oil pump is worn, the controller cannot automatically or manually identify the degree of wear, resulting in low combustion efficiency and easily causing substandard flue gas emissions. When the oil pump is replaced, the parameters cannot be manually or automatically corrected, which brings great trouble to customers and places very high demands on operators. In addition, the quality of fuel fluctuates and the fuel may be highly corrosive. Therefore, for oil pumps that use oil pump variable frequency control technology, the actual fuel volume corresponding to each frequency will have different degrees of deviation after a period of use, except for accurate control when the machine is new. With the increase of oil pump wear and / or corrosion, the deviation becomes larger and larger.

[0003] In view of this, the applicant conducted in-depth research on this basis, which led to the emergence of this case. Utility Model Content

[0004] The purpose of the utility model is to provide an oil burner which can accurately control the amount of fuel, ensure the stability of oil supply, have good flame continuity, and have low requirements for the oil pump.

[0005] In order to achieve the above purpose, the solution of the utility model is:

[0006] A fuel burner comprises a burner body, an oil circuit, a monitoring and control system, and a valve assembly including a constant resistance valve and a back pressure valve, wherein the monitoring and control system comprises a flow regulating valve, an oil pump, a pressure sensor and a controller, the oil inlet of the burner body is connected to an oil source via a first oil circuit, the oil pump and the constant resistance valve are sequentially installed on the first oil circuit along the flow direction, the first oil circuit is connected to the oil source via a second oil circuit at a position adjacent to the oil inlet of the constant resistance valve, the pressure sensor, the flow regulating valve and the back pressure valve for adjusting the pressure of the minimum fire of the burner are sequentially installed on the second oil circuit along the flow direction; wherein the signal output end of the controller is electrically connected to the driving end of the flow regulating valve, the signal input end of the controller is electrically connected to the collecting end of the pressure sensor for obtaining oil pressure to control the opening of the flow regulating valve; the signal output end of the controller is electrically connected to the signal input end of the oil pump for controlling the start and stop of the oil pump.

[0007] The flow regulating valve is controlled by a driving motor, and the driving end of the flow regulating valve is the driving end of the driving motor.

[0008] An oil valve is installed between the oil inlet of the first oil circuit corresponding to the oil burner body and the oil outlet of the constant resistance valve.

[0009] An oil filter is installed between the first oil circuit corresponding to the oil pump and the oil source.

[0010] The oil source is an oil tank.

[0011] The burner body includes a fan, and the signal output end of the controller is electrically connected to the signal input end of the fan to control the start, stop and size of the fan.

[0012] After adopting the above structure, the utility model has the following beneficial effects: the oil pump of the utility model adopts start-stop control (i.e. fixed pump operation), and the fuel flows through the constant resistance valve to be atomized by the oil gun in the fuel burner body and then burned, while the excess fuel that does not participate in the combustion passes through the flow regulating valve and the back pressure valve in turn and returns to the oil source; compared with the existing technology, the combination of the constant resistance valve and the back pressure valve is adopted to reduce the adjustment accuracy requirements of the flow regulating valve, and the fuel amount can be accurately controlled to ensure the stability of the oil supply, thereby ensuring the stability of the flame on the burner body, and reducing the influence of the oil pump, that is, the utility model can realize the control of the combustion output power by pressure, regardless of whether the oil pump is worn or replaced, it can return to the standard combustion state, solve the problems of combustion sufficiency and stability, and reduce the influence of wear and corrosion of the oil pump on combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the oil circuit of the burner in this utility model.

[0014] In the picture:

[0015] 1 - Burner body; 11 - Fan; 21 - Flow control valve; 22 - Oil pump; 23 - Pressure sensor; 31 - First oil circuit; 32 - Second oil circuit; 4 - Oil source; 51 - Back pressure valve; 52 - Constant resistance valve; 53 - Oil valve; 6 - Oil filter. DETAILED DESCRIPTION

[0016] In order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0017] The invention discloses an oil burner which improves the oil circuit of a conventional burner.

[0018] like Figure 1 As shown, the burner includes a burner body 1, an oil circuit and a detection and control system. The burner body 1 adopts an existing conventional burner body for combustion through oil; the detection and control system includes a flow regulating valve 21, an oil pump 22, a pressure sensor 23 and a controller. The oil circuit includes a first oil circuit 31 and a second oil circuit 32, wherein the oil inlet of the burner body 1 is connected to the oil source 4 through the first oil circuit 31, and the first oil circuit 31 is sequentially installed with the oil pump 22 and the constant resistance valve 52 along the flow direction of the oil. The constant resistance valve 52 is located near the oil inlet of the burner body 1, and the oil pump 22 is near the oil outlet of the oil source 4; the first oil circuit 32 is connected to the oil source 4 through the second oil circuit 32 at a position near the oil inlet of the constant resistance valve 52. The second oil circuit 32 is an oil return circuit. The second oil circuit 32 is sequentially installed with the above-mentioned pressure sensor 23, the above-mentioned flow regulating valve 21 and the back pressure valve 51 along the flow direction. The signal output end of the controller is electrically connected to the driving end of the flow control valve 21 , the signal input end of the controller is electrically connected to the collecting end of the pressure sensor 23 , and the signal output end of the controller is electrically connected to the signal input end of the oil pump 22 .

[0019] Furthermore, in this embodiment, the above-mentioned constant resistance valve 52 adopts a constant resistance valve already sold on the market, and the above-mentioned back pressure valve 51 adopts a back pressure valve already sold on the market, wherein the constant resistance valve 52 is used not to open when the oil pressure in the oil circuit is less than the resistance of the constant resistance valve 52, thereby ensuring that the oil supply of the burner body 1 remains stable under low fire conditions, thereby ensuring the stability of the flame in the low frequency band; the back pressure valve 51 is used to adjust the minimum fire pressure of the burner body 1 to avoid flameout due to unstable oil pressure when the burner body 1 is in low fire, thereby ensuring the stability of the flame. The specific description is as follows: In this embodiment, the burner adopts a compressed air atomization combustion method. There is a process of pressure balance between the atomized gas and the fuel. If the oil pressure is insufficient, it will not be able to overcome the air pressure, so the small fire may be unstable or cut off. Therefore, the setting of the constant resistance valve can allow the fuel to be under a higher pressure. When there is air pressure, the higher oil pressure can ensure that the oil pressure can be sprayed out smoothly without being pushed back, and the constant resistance valve will not increase significantly synchronously due to the increase in oil flow. Therefore, combined with the back pressure valve, when the return oil pressure is higher than the set pressure value, the valve opening increases to ensure that the oil pressure is basically stable at a certain value. In this way, the combination of the constant resistance valve 52 and the back pressure valve 51 increases the accuracy of the fuel amount entering the burner body 1, that is, reduces the manufacturing accuracy of the flow control valve 21, so that the required accuracy of the flow control valve 21 is reduced.

[0020] Furthermore, the flow control valve 21 is used to regulate the amount of oil returning to the oil source 4, thereby regulating the amount of oil in the burner body 1. The flow control valve 21 is controlled by a drive motor, i.e., the drive motor is used to adjust the opening of the flow control valve 21. The transmission structure between the flow control valve 21 and the drive motor is the inherent configuration of a conventional flow control valve 21, so it will not be described in detail. The drive end of the flow control valve 21 is the drive end of the drive motor. Thus, through the control of the controller, the drive motor drives the flow control valve 21 to operate, thereby controlling the opening of the flow control valve 21. In this embodiment, the flow control valve 21 is a commercially available flow control valve.

[0021] Furthermore, the above-mentioned pressure sensor 23 is used to detect the oil pressure, that is, the pressure sensor detects the oil pressure and transmits it to the controller, and the controller controls the opening of the flow control valve 21 according to the oil pressure; in this embodiment, the pressure sensor 23 uses a pressure sensor already sold on the market.

[0022] Furthermore, the above-mentioned oil pump 22 is used to pump oil into the burner body 1. The start and stop of the oil pump 22 is controlled by a controller to realize that the oil pump 22 adopts a fixed pump operation, that is, the oil outlet pressure of the oil pump 22 changes in real time according to the combustion output. The oil pump 22 only needs to meet the oil supply pressure. The oil pump 22 does not need to be maintained in a high-pressure state, which extends the service life of the oil pump and reduces the impact of the oil pump 22 on the flame of the burner body 1 to ensure the stability of the oil supply and the continuity of the flame. In this way, when the oil pump 22 is worn, corroded or replaced, the performance of the oil pump 22 will not have any effect on combustion; in this embodiment, the oil pump 22 is an oil pump already sold on the market.

[0023] Furthermore, an oil valve 53 is installed between the oil inlet of the burner body 1 and the constant resistance valve 52 in the first oil passage 31. This oil valve 53 is a manual valve that is manually adjusted to connect or disconnect the oil between the oil source 4 and the oil inlet of the burner body 1. Alternatively, the oil valve 53 can be an electric valve, with its drive terminal electrically connected to the signal output terminal of the controller, enabling the controller to control the opening and closing of the oil valve 53.

[0024] Furthermore, the oil source 4 is an oil tank storing oil.

[0025] Furthermore, an oil filter 6 is installed between the oil pump 22 and the oil source 4 to filter the oil entering the oil pump 22 and remove impurities.

[0026] Preferably, a heater is installed between the constant resistance valve and the oil pump in the above-mentioned first oil circuit 31, and the heater is used to heat the oil to adapt to the oil that needs to be heated; in this embodiment, the heater can be a conventional heater such as a heating wire, a heating tube, etc. arranged in the first oil circuit.

[0027] Furthermore, the controller that can realize the above functions can be realized by using an existing conventional PLC controller, such as a PLC of Siemens 200SMART model.

[0028] Furthermore, the burner body 1 further includes a fan 11, and the signal output end of the controller is electrically connected to the signal input end of the fan, so that the start and stop of the fan and the air volume can be controlled by the controller to assist combustion.

[0029] In this embodiment, a fuel burner has a specific working process as follows: the controller controls the start and stop of the oil pump 22 to realize the fixed pump operation of the oil pump 22, and the fuel is pumped into the burner body 1 through the constant resistance valve 52 by the oil pump 22. The fuel enters the oil gun of the burner body 1 and is atomized and burned, while the excess fuel is adjusted by the flow control valve to adjust the fuel amount, and then returns to the oil source through the back pressure valve; in this process, the controller controls the opening of the flow control valve according to the flame size required by the burner body 1, and its actual oil pressure should be the sum of the resistance of the flow control valve + the set pressure of the back pressure valve. In this way, the size of the flame is synchronously variable with the sum of these pressures, because there is an existing conventional square correspondence relationship between oil pressure and flow (P is proportional to Q 2 ), so adjusting the return oil pressure can achieve precise regulation of the fuel flow. This oil pressure and flow regulation is a conventional method. Because pressure is used to control the fuel flow, if the pump wears, the oil pressure will drop. When pressure feedback detects a drop in oil pressure, it automatically reduces the opening of the flow control valve to compensate for the pressure drop, thereby avoiding the impact of pump wear. Similarly, after replacing a new pump, the oil pressure will suddenly increase. The system will automatically increase the opening of the flow control valve to reduce the oil pressure and ensure that the fuel supply is constant at the required value. This solves the impact of oil pump performance changes on combustion. At the same time, it can judge the performance of the oil pump and predict its lifespan, providing early warnings of insufficient performance and prompting replacement of the new pump.

[0030] The above description is only a preferred embodiment of this embodiment. Any equivalent changes and modifications made within the scope of the claims of the present utility model should fall within the scope of the claims of the present utility model.

Claims

1. A fuel burner, characterized in that: The invention comprises a burner body, an oil circuit, a monitoring and control system, and a valve assembly including a constant resistance valve and a back pressure valve. The monitoring and control system comprises a flow regulating valve, an oil pump, a pressure sensor and a controller. The oil inlet of the burner body is connected to an oil source via a first oil circuit. The first oil circuit is provided with the oil pump and the constant resistance valve in sequence along a flow direction. The first oil circuit is connected to the oil source via a second oil circuit at a position adjacent to the oil inlet of the constant resistance valve. The second oil circuit is provided with the pressure sensor, the flow regulating valve and the back pressure valve for setting the minimum fire pressure of the burner in sequence along a flow direction. The signal output end of the controller is electrically connected to a driving end of the flow regulating valve, and the signal input end of the controller is electrically connected to a collecting end of the pressure sensor for obtaining oil pressure to control the opening of the flow regulating valve. The signal output end of the controller is electrically connected to a signal input end of the oil pump for controlling the start and stop of the oil pump.

2. The oil burner according to claim 1, characterized in that: The flow regulating valve is controlled by a driving motor, and the driving end of the flow regulating valve is the driving end of the driving motor.

3. The oil burner according to claim 1, characterized in that: An oil valve is installed between the oil inlet hole of the first oil circuit corresponding to the oil burner body and the oil outlet hole of the constant resistance valve.

4. An oil burner according to any one of claims 1 to 3, characterized in that: An oil filter is installed between the first oil circuit corresponding to the oil pump and the oil source.

5. The oil burner according to claim 4, characterized in that: The oil source is an oil tank.

6. An oil burner according to any one of claims 1 to 3, characterized in that: The burner body comprises a fan, and the signal output end of the controller is electrically connected to the signal input end of the fan to control the start, stop and size of the fan.

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