Boiler burner air inlet system and boiler burner

Abstract

The utility model relates to the field of combustors, in particular to a boiler combustor air inlet system and a boiler combustor. The boiler burner gas inlet system comprises a hearth smoke temperature sensor, a draught fan, a gas pipeline and a controller. The hearth smoke temperature sensor is used for detecting the temperature of hearth tail gas. The fan is used for supplying air to the combustor; the fuel gas pipeline is used for supplying fuel gas to the combustor, and a regulating valve with an adjustable opening degree is mounted on the fuel gas pipeline; the controller is connected with the hearth smoke temperature sensor, the adjusting valve and the draught fan and used for adjusting the frequency of the draught fan and / or the opening degree of the adjusting valve according to the temperature detected by the hearth smoke temperature sensor. The gas burner can adapt to combustion of gas with complex and changeable components, and the air supply quantity is matched with the gas supply quantity.

Description

Technical Field

[0001] The utility model relates to the field of burners, in particular to an air intake system for a boiler burner and a boiler burner. Background Art

[0002] During the combustion process of a vertical boiler, air is provided by a fan and gas is supplied through a gas pipeline. Once the air intake speed and the gas intake speed are set, they will not be easily changed in the subsequent process.

[0003] Changes in gas composition will cause changes in combustible components. The existing burner air intake system is unable to control the air-to-gas ratio according to changes in gas composition, resulting in a poor burner air-fuel ratio, excess air or incomplete gas combustion. Summary of the invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a boiler burner air intake system, which can adapt to the combustion of gas with complex and changeable components and match the air supply amount with the gas supply amount.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a boiler burner air intake system, comprising:

[0006] Furnace smoke temperature sensor, used to detect furnace exhaust temperature;

[0007] a fan for supplying air to the burner;

[0008] A gas pipeline, used for supplying gas to the burner, wherein a regulating valve with adjustable opening is installed on the gas pipeline;

[0009] A controller is connected to the furnace smoke temperature sensor, the regulating valve and the fan respectively, and is used to adjust the frequency of the fan and / or the opening of the regulating valve according to the temperature detected by the furnace smoke temperature sensor.

[0010] Furthermore, the boiler burner air intake system also includes a water temperature sensor, which is used to detect the boiler water temperature; wherein,

[0011] The controller is also connected to the water temperature sensor, and is also used to adjust the opening of the regulating valve and the frequency of the fan according to the temperature detected by the water temperature sensor.

[0012] Furthermore, the regulating valve is an electrically driven valve.

[0013] Furthermore, the controller is a PLC controller.

[0014] The utility model also relates to a boiler burner, comprising an air intake system of the boiler burner.

[0015] Furthermore, the boiler burner also includes a flame sensor, a gas pressure sensor and an igniter, and the flame sensor, the gas pressure sensor and the igniter are respectively connected to a controller.

[0016] Furthermore, the boiler burner also includes an alarm device, and the alarm device is connected to the controller.

[0017] After adopting the above technical solution, the utility model has the following beneficial effects:

[0018] 1. The utility model reflects the change of gas composition through the change of furnace tail gas temperature, and can adjust the fan frequency and the opening of the regulating valve of the gas pipeline to match the air supply and gas supply, and can adapt to the combustion of gas with complex and changeable components, and provide a more stable and efficient combustion effect;

[0019] 2. The utility model detects the change of gas composition by detecting the change of furnace tail gas temperature. Compared with directly detecting the gas composition and the content of each component, the detection method is simple and the implementation cost is low;

[0020] 3. This embodiment uses a water temperature sensor to sense the hot water temperature of the boiler, adjusts the opening of the regulating valve to adapt to changes in the burner load, and adjusts the frequency of the fan motor inverter to ensure the air-fuel ratio, so as to flexibly adjust the combustion state according to actual needs and ensure the stability and efficiency of combustion, avoid the production of nitrogen oxides due to excessive furnace temperature, and eliminate the risk of excessive pollutant emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the air intake system of a boiler burner of the utility model;

[0022] Figure 2 This is a principle block diagram of the boiler burner of the utility model;

[0023] In the figure, 1. furnace smoke temperature sensor; 2. fan 2; 3. gas pipeline; 4. regulating valve; 5. controller; 6. water temperature sensor; 7. gas pressure sensor; 8. igniter; 9. flame sensor. DETAILED DESCRIPTION

[0024] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

[0025] Embodiment 1

[0026] like Figure 1 , Figure 2 As shown, a boiler burner air intake system comprises:

[0027] Furnace smoke temperature sensor 1, used to detect furnace exhaust temperature;

[0028] A fan 2, for supplying air to the burner;

[0029] A gas pipeline 3 is used to supply gas to the burner, and a regulating valve 4 with an adjustable opening is installed on the gas pipeline 3;

[0030] The controller 5 is respectively connected to the furnace smoke temperature sensor 1 , the regulating valve 4 and the fan 2 , and is used to adjust the frequency of the fan 2 and / or the opening of the regulating valve 4 according to the temperature detected by the furnace smoke temperature sensor 1 .

[0031] The regulating valve 4 is an electrically driven valve and the controller 5 is a PLC controller.

[0032] The change of gas composition leads to an increase in combustible materials and incomplete combustion of gas, or a decrease in combustible materials and excess air, which in turn causes a change in the furnace exhaust temperature. Therefore, when the load remains unchanged, if the furnace exhaust temperature detected by the furnace smoke temperature sensor 1 decreases, it is necessary to adjust the frequency of the fan 2 and / or the opening of the regulating valve 4 to ensure that neither incomplete combustion nor excess air occurs.

[0033] Specifically, this embodiment reflects the change of gas composition through the change of furnace exhaust gas temperature, and can adjust the frequency of the fan 2 and the opening of the regulating valve 4 of the gas pipeline 3, so that the air supply and the gas supply are matched, and can adapt to the combustion of gas with complex and variable components, and provide a more stable and efficient combustion effect. In addition, the change of gas composition is detected by detecting the change of furnace exhaust gas temperature. Compared with directly detecting the gas composition and the content of each component, the detection method is simple and the implementation cost is low.

[0034] The adjustment strategy for the frequency of fan 2 and the opening of regulating valve 4 is as follows: when the load remains unchanged and the combustible substances in the gas composition decrease, the exhaust gas temperature decreases due to excess air, and the opening of regulating valve 4 is increased to increase the gas volume; when the combustible substances in the gas composition increase, the heat generated due to reducing properties decreases and the exhaust gas temperature decreases, and the speed of fan 2 is increased to increase the air supply volume until the flue gas temperature first rises and then decreases.

[0035] A more specific strategy is to gradually increase the frequency of fan 2 when the furnace exhaust gas temperature detected by the furnace smoke temperature sensor 1 decreases; if the furnace exhaust gas temperature rises and begins to decrease, keep the frequency of fan 2 at the value when the furnace exhaust gas temperature begins to decrease, and the adjustment process ends; if the furnace exhaust gas temperature decreases, restore the frequency of fan 2 and gradually increase the opening of the regulating valve 4 until the furnace exhaust gas temperature recovers, and the adjustment process ends.

[0036] During this adjustment process, if the furnace exhaust gas temperature rises after increasing the frequency of Fan 2, it means that the previous temperature drop was caused by the increase of combustible substances in the gas component. When the furnace exhaust gas temperature begins to drop, the air-fuel ratio is optimal. The frequency of Fan 2 is maintained at this moment to complete the adjustment. If the furnace exhaust gas temperature drops after increasing the frequency of Fan 2, it means that the previous temperature drop was caused by the excess air due to the reduction of combustible substances in the gas component. Therefore, the frequency of Fan 2 is restored, and the opening of regulating valve 4 is gradually increased until the furnace exhaust gas temperature is restored, and the adjustment is completed.

[0037] Embodiment 2

[0038] Based on the first embodiment, Figure 2 As shown, the boiler burner air intake system also includes a water temperature sensor 6, which is used to detect the boiler water temperature; wherein,

[0039] The controller 5 is also connected to the water temperature sensor 6 , and is also used to adjust the opening of the regulating valve 4 and the frequency of the fan 2 according to the temperature detected by the water temperature sensor 6 .

[0040] Specifically, this embodiment also uses the water temperature sensor 6 to sense the hot water temperature of the boiler, adjusts the opening of the regulating valve 4 to adapt to the change of the burner load, and adjusts the motor inverter frequency of the fan 2 to ensure the air-fuel ratio, so as to flexibly adjust the combustion state according to actual needs and ensure the stability and efficiency of combustion, avoid the production of nitrogen oxides due to excessive furnace temperature, and eliminate the risk of excessive emissions of pollutants.

[0041] Embodiment 3

[0042] A boiler burner includes the boiler burner air intake system of the first or second embodiment.

[0043] like Figure 2 As shown, the boiler burner has a water temperature sensor 6, a flame sensor 9, a gas pressure sensor 7 and an igniter 8 in addition to the air intake system. The entire working process is:

[0044] When the boiler water temperature detected by the water temperature sensor 6 is lower than the starting temperature, the fan 2 is controlled to start and the furnace is cleaned. After the purge time meets the requirement and the gas pressure detected by the gas pressure sensor 7 meets the requirement, the regulating valve 4 is opened and the igniter 8 is ignited. After the flame sensor 9 detects the ignition, the water temperature is continuously detected. When the water temperature is lower than the stop temperature, the frequency of the fan 2 and / or the opening of the regulating valve 4 are adjusted according to the furnace exhaust gas temperature detected by the furnace smoke temperature sensor 1. After the water temperature reaches the stop temperature, the regulating valve 4 is controlled to close.

[0045] The boiler burner also has an alarm device. When the purge time meets the requirement, if the gas pressure detected by the gas pressure sensor 7 does not meet the requirement, the controller 5 controls the alarm device to alarm. When the igniter 8 is ignited and the flame sensor 9 does not detect ignition, the alarm device is controlled to alarm, and the regulating valve 4 is closed to enter the furnace for cleaning.

[0046] Specifically, the burner is provided with functions such as automatic closing of the regulating valve 4 and alarm when the flame is turned off, over-temperature protection, and delayed self-purge of the furnace ignition, so that protective measures can be taken in time when abnormal situations occur to avoid possible safety risks.

[0047] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A boiler burner air intake system, characterized in that: include: A furnace smoke temperature sensor (1) is used to detect the furnace exhaust temperature; a fan (2), used for supplying air to the burner; A gas pipeline (3) for supplying gas to the burner, wherein a regulating valve (4) with an adjustable opening is installed on the gas pipeline (3); A controller (5) is respectively connected to the furnace smoke temperature sensor (1), the regulating valve (4) and the fan (2), and is used to adjust the frequency of the fan (2) and / or the opening of the regulating valve (4) according to the temperature detected by the furnace smoke temperature sensor (1).

2. The boiler burner air intake system according to claim 1, characterized in that: It also includes a water temperature sensor (6), which is used to detect the boiler water temperature; wherein, The controller (5) is also connected to the water temperature sensor (6), and is also used to adjust the opening of the regulating valve (4) and the frequency of the fan (2) according to the temperature detected by the water temperature sensor (6).

3. The boiler burner air intake system according to claim 1, characterized in that: The regulating valve (4) is an electrically driven valve.

4. The boiler burner air intake system according to claim 1, characterized in that: The controller (5) is a PLC controller.

5. A boiler burner, characterized in that: A boiler burner air intake system comprising any one of claims 1-4.

6. The boiler burner according to claim 5, characterized in that: It also comprises a flame sensor (9), a gas pressure sensor (7) and an igniter (8), wherein the flame sensor (9), the gas pressure sensor (7) and the igniter (8) are respectively connected to the controller (5).

7. The boiler burner according to claim 6, characterized in that: It also includes an alarm device, which is connected to the controller (5).

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