JPH02242013A - Burner combustion control method - Google Patents

Abstract

PURPOSE:To improve a combustion efficiency and reduce an amount of air pollutant by a method wherein a flame generated from a burner is divided into a red light component and a blue light component and a burner combustion air is adjusted in response to a difference which is got through a comparison between an intensity of optical energy of the blue light got by a calculation and another intensity of optical energy of blue light of the flame which is got from the burner under its most appropriate combustion state. CONSTITUTION:A photo-electrical convertor 5 converts a blue light of a flame of each of burners 1 divided by a two-color spectroscope 4 into an electrical signal and sends it to a calculation control device 6. The calculation control device 6 calculates an intensity of energy of blue light on the basis of an electrical signal got from the photo-electrical convertor 5, compares an intensity of energy of got blue light with another intensity of energy of the blue light from the burner 1 under the most appropriate combustion state from a setting unit 7, takes its difference. In case that a measured value of the intensity of the blue light is lower than the set value, a flow rate or a flow speed of the combustion air to be supplied to the burners 1 are increased by a burner adjustor 8.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a burner combustion control method.

[Prior Art] Generally, a boiler controls a plurality of burners at the same time.

However, when a plurality of burners are all controlled simultaneously, it is not possible to cause each burner to burn in an optimal state because the individual burners have different characteristics.

Therefore, conventionally, after the entire burner has been controlled, a worker manually readjusts the combustion state of each burner based on his or her own experience.

[Problems to be Solved by the Invention] However, in the conventional manual adjustment work of the combustion state of each burner by a worker, each worker has different standards for adjustment, so it is difficult to always burn each burner in the optimal state. I couldn't let it go.

For this reason, the combustion efficiency of the entire burner is not high enough,
Furthermore, it has not been possible to reduce the concentration of air pollutants such as nitrogen oxides in the exhaust gas generated by combustion in the burner.

In view of the above-mentioned circumstances, the present invention provides a burner combustion control method that enables efficient combustion of each burner after controlling the entire burner, thereby improving combustion efficiency and reducing air pollutants. The purpose is to provide

[Means for Solving Problem 51] The present invention uses a dichroic spectrometer to separate the flame of a burner into red light and blue light, and calculates the energy of the blue light out of the light separated by the dichroic spectrometer. In addition to calculating the strength with a calculation control device,
The intensity of the blue light energy obtained by calculation by the arithmetic and control unit is compared with the intensity of the blue light energy of the burner flame in the optimum combustion state set in the setting device, and the obtained result is determined by comparing The present invention relates to a burner combustion control method characterized in that the burner combustion air is adjusted by a burner adjustment device based on the determined deviation.

[Function] Since the burner flame becomes bluish when a large amount of nitrogen oxides are generated, the energy intensity of the blue light in the burner flame is determined and the burner flame is determined when the burner is in the optimum combustion state. By adjusting the combustion air supplied to the burner so that it is equal to the energy intensity of the blue light, the burner will be in the optimal combustion state.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an apparatus for implementing the method of the present invention, in which 1 is a plurality of burners (only two burners are shown) that use gaseous fuel attached to a boiler (not shown), and 2 is a boiler (not shown). A light detection end consisting of a lens attached to the tip of an optical fiber arranged facing the flame of each burner 1, 3 collects the light of the flame of the burner L from a plurality of light detection ends 2 and extracts it one by one in order. The optical scanner 4 uses a filter to convert the flame light of the burner L sent from the optical scanner 3 to a wavelength of 57.
A dichroic spectrometer separates light into two colors of blue light and red light around 0 nanometers, and 5 is a photoelectric converter that converts the blue light of the light separated by the dichroic spectrometer 4 into an electrical signal. , 6 calculates the intensity of blue light energy based on the electrical signal from the photoelectric converter 5, and calculates the intensity of the obtained blue light energy and the burner l in the optimum combustion state from the setting device 7. An arithmetic and control unit 8 calculates the deviation from the intensity of the blue light energy of the arithmetic and control unit B, and 8 determines the flow rate and flow velocity of the combustion air supplied to the burner 1 based on the deviation signal from the arithmetic and control unit B. This figure shows a burner adjustment device that adjusts the turning force, for example, the angle of the vane.

Next, the operation will be explained.

After the control of the burner l as a whole is completed, the combustion control method of the burner l according to the present invention is carried out for each burner l.

The flame of burner 1, especially burner 1, which uses gaseous fuel, becomes bluish when a large amount of nitrogen oxides are generated, so the blue color of the flame of burner 1 is optimized for combustion. If the burner 1 is maintained at the desired temperature, the burner 1 can be kept in the optimal combustion state at all times.

Therefore, first, the optical scanner 3 sequentially extracts the flame light of the corresponding burner l from all the optical detection ends 2 and sends it to the dichroic spectrometer 4. The flame light from each burner L is split into two colors of blue light and red light at a wavelength of around 570 nanometers using an internal filter.
The blue light of the flames of each burner 1 separated into spectra is converted into an electrical signal and sent to the arithmetic and control unit 6. The arithmetic and control device 6 calculates the intensity of blue light energy based on the electrical signal from the photoelectric converter 5, and calculates the intensity of the blue light energy obtained and the optimal combustion state from the setting device 7. burner 1
The energy intensity of the blue light is compared with the energy intensity of the blue light, the deviation is calculated, and a signal of the deviation is sent to the burner adjustment device 8.The burner adjustment device 8, based on the deviation from the arithmetic and control device 6, calculates the deviation as shown in FIG. As shown in the figure, if the value a calculated by calculating the energy intensity of blue light a is larger than the set price, the bar is
The flow rate and flow rate of the combustion air supplied to burner 1 will reduce the swirling force applied to the combustion air, and conversely, if the measured value of the blue light energy intensity is smaller than the set value, burner 1 The flow rate and velocity of the combustion air supplied to the combustion air increases the swirling force exerted on the combustion air.

By doing so, each burner 1 is always kept in an optimal combustion state, the combustion efficiency of the burner 1 as a whole increases, and the concentration of air pollutants in the exhaust gas decreases.

It should be noted that the burner combustion control method of the present invention is not limited to the above-described embodiments, and it goes without saying that various changes may be made without departing from the gist of the present invention.

[Effects of the Invention] As explained above, according to the burner combustion control method of the present invention, various excellent effects as described below can be achieved.

■ After controlling the burners as a whole, each burner can be made to burn in the optimum state at all times.

■ From ■, the combustion efficiency of the entire burner can be further improved, and fuel efficiency can be improved.

(2) The concentration of air pollutants in the exhaust gas generated by combustion in the burner can be lowered, and even if strict exhaust gas standards are established, it can be satisfactorily met.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an apparatus for implementing the method of the present invention, and FIG. 2 is a diagram showing the relationship between the wavelength of a burner flame and the energy intensity. In the figure, 1 is a burner, 4 is a dichroic spectrometer, 6 is an arithmetic and control unit,
7 indicates a setting device, and 8 indicates a burner adjustment device.

Claims (1)

[Claims] 1) Separate the flame of the burner into red light and blue light using a dichroic spectrometer, calculate the energy intensity of the blue light among the light spectrally separated by the dichroic spectrometer, and use an arithmetic controller to calculate the energy intensity of the blue light. Comparing the intensity of blue light energy obtained by calculation by the arithmetic and control device with the intensity of blue light energy of the burner flame in the optimum combustion state set in the setting device,
A burner combustion control method, comprising adjusting combustion air for the burner using a burner adjustment device based on the deviation obtained from the comparison.