Wireless temperature measurement system for heat storage element in rotor of rotary air preheater

Abstract

The invention discloses a wireless temperature measurement system for a heat storage element in a rotor of a rotary air preheater and belongs to the field of temperature measurement of rotary air preheaters. The system is composed of a temperature measuring device, a sending device, a relay device, a receiving device and an upper computer, wherein the temperature measuring device is a temperature sensor; the sending device is composed of an A / D conversion chip, a processor module A, a communication module A and a power supply module A; the relay device is composed of a processor module B, a communication module B and a power supply module B; and the receiving device comprises a communication module C, a display module and a processor module C; and the upper computer is a host of a power plant control system. The system is used for measuring the temperature of the heat storage element in the rotary air preheater rotor in the power plant adjusting and controlling process, a problem that the internal temperature of the rotary air preheater rotor is difficult to measure is solved through the wireless temperature measuring technology, meanwhile, the cost is reduced by utilizing a power plant preset circuit, and stable operation of the air preheater and a power plant boiler unit is guaranteed.

Description

technical field [0001] The invention belongs to the field of temperature measurement of a rotary air preheater, and in particular relates to a wireless temperature measurement system for a heat storage element inside a rotor of a rotary air preheater, which is used for wirelessly measuring the temperature of the heat storage element inside a rotor of a rotary air preheater . Background technique [0002] During the operation of large-scale power plant boiler units, the exhaust gas temperature is often as high as hundreds of degrees Celsius, resulting in a huge exhaust heat loss. If the primary and secondary air entering the boiler furnace is not preheated, it is only tens of degrees Celsius. After entering the furnace Affects the thermal efficiency of combustion, so the boiler unit often uses an air preheater to use the exhaust smoke of the boiler to preheat the air entering the furnace. In my country's large-scale power plant boiler units, the air preheater has become an i...

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Problems solved by technology

However, excessive ammonia gas in the SCR denitrification device will react with sulfur oxides to form ammonium bisulfate and other substances, which will condense when it reaches the air preheater, causing the air preheater to be blocked by dust accumulation or even scrapped and shut down, which greatly affects the operation stability of the boiler unit sex and economy

[0005] Whether it is to calculate the heat transfer rate of the air preheater or to grasp the dust accumulation of the air preheater in time, the temperature data of the air preheater is required. However, the existing technology can only monitor the temperature of the inlet and outlet of the air preheater. The internal rotor of the air preheater is constantly rotating, so it is impossible to use a thermocouple thermometer to measure directly with a wired method. The infrared temperature measurement method can only measure the external temperature of the rotor, and the error is large, and the temperature of the internal heat storage element cannot be accurately measured.

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