System and method applicable to measuring power conditions in intelligent cold furnace of large-sized boiler

Abstract

The invention discloses a system and a method applicable to measuring power conditions in an intelligent cold furnace of a large-sized boiler. The system comprises a burning tangential circle measurement device, a near-wall wind measurement device, an image acquisition system, a data acquisition and processing system and a mobile platform system, wherein the data acquisition and processing system receives all analog signals and digital signals which are acquired by the burning near-wall wind measurement device and the burning tangential circle measurement device, then the signals are sent to a data acquisition instrument, the data acquisition instrument processes signals transmitted by a data acquisition board and then sends the signals to a computer to carry out data processing, and the data acquisition instrument further gives out an instruction to control the mobile platform system to operate. The system disclosed by the invention can show air power conditions in the furnace qualitatively and quantitatively in real time, the whole measurement process does not need any participation of testers after installation and debugging operations are completed, thereby avoiding measurement operations of the testers in a severe environment, reducing the work intensity, and improving the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of power station boilers, in particular to a measurement system and method for the power state of a large power station pulverized coal boiler in a cold state. Background technique [0002] Among the various power generation methods in our country, coal-fired thermal power generation is still the main one. Among the main units of 300MW and 600MW, the tangential combustion method has the characteristics of long combustion stroke, strong mixing in the furnace, and high combustion efficiency in pulverized coal boilers. is widely used in. [0003] For large utility boilers that use tangential combustion, the combustion effect is directly related to the aerodynamic conditions in the furnace, but in the case of pulverized coal combustion, the furnace is a high-temperature environment that can reach up to 1500°C and ash. Moreover, pulverized coal combustion is a physical and chemical process with multiple variable...

AI Technical Summary

Problems solved by technology

There are several problems in this patent. The first is that the improved Pitot tube needs to be repaired and the installation fixed angle is relatively high, and the burner nozzle is more complicated now, so it is easy to make deviations in the installation angle of the Pitot tube and make the measurement results inaccurate; The second is that the system is very complicated. For a 300MW low-nitrogen burner, there are 24 primary air nozzles, 28 secondary air nozzles, 16 SOFA nozzles, and a total of 68 nozzles. Assuming that each nozzle uses two improved Pitot tubes, 136 pitot tubes are used, and the corresponding relationship between differential pressure transceivers and pitot tubes is not specified in this patent. If 4 pitot tubes correspond to a differential pressure transceiver, the number of differential pressure transceivers reaches 34 First, the equipment that needs to be installed and disassembled in general is too large; the third point is that the patent does not explain the processing of data by the microprocessor, and there is no relevant explanation in the claims, because this patent uses pitot tubes to measure The wind speed of the nozzle, due to the inevitable installation deviation or the blockage of the measuring hole, the measurement data will have a large deviation, so the microprocessor must have a basis for judging when processing the data to determine whether the data is reasonable, and then perform data calculation such as the average value Calculation, or two-dimensional spout velocity distribution, etc.; the fourth point is that this patent uses a wireless differential pressure transceiver to send the measurement data to the microprocessor. Since the entire furnace is a relatively closed steel structure, it has shielding for wireless signals. effect, will reduce the effect of using the wireless differential pressure transceiver

Therefore, it can be seen from the above analysis that this patent will have many limitations or deficiencies in practical applications, and this patent is mainly used to measure the wind speed of the cold nozzle, not suitable for measuring the aerodynamic conditions in the furnace

[0015] Patent 201410195834.2 is suitable for the nozzle wind speed measurement system and method of pulverized coal burner cold state test. This patent proposes an intelligent system and method for boiler cold state nozzle wind speed measurement. The condition of the aerodynamic field

[0016] From the above analysis, it can be seen that the test of the aerodynamic field in the furnace can effectively judge and analyze the thermal combustion state of the boiler. However, due to the inherent defects of numerical simulation, the current method still uses testers to enter the furnace. Measuring the aerodynamic conditions in the furnace, but for the testers, there are disadvantages such as harsh environment, high labor intensity, and large measurement errors. Therefore, it is necessary to design a simple structure, accurate measurement and no need for testers to enter the furnace. Measuring System of Intelligent Furnace Aerodynamic Condition

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