A synchronous online monitoring device for low-temperature corrosion process and state of flue gas cooler

Abstract

The invention discloses a synchronous online monitoring device for the low-temperature corrosion process and state of a flue gas cooler, which comprises at least one constant wall temperature heat exchange tube. The constant wall temperature heat exchange tube consists of a condensation section, an adiabatic section and an evaporation When monitoring, the evaporation section of the constant wall temperature heat exchange tube is placed in the tail flue, and the outer wall of the evaporation section is connected with a thermocouple through a wire, and the outside of the condensation section of the constant wall temperature heat exchange tube is connected with a sleeve for forced convection heat dissipation. The bottom of the casing for forced convection heat dissipation is open, and the top is open and connected to the blower through an air pipeline. A regulating valve is installed on the air pipeline on each branch of the casing for forced convection heat dissipation to regulate the air flow; constant wall There is a medium for heat exchange in the warm heat exchange tube; the device of the present invention has a simple structure, no complicated connection, easy implementation, offline detection, stable metal wall temperature, and can truly reflect the low-temperature corrosion process and state of the heat exchanger at the same level.

Description

technical field [0001] The invention belongs to the technical field of monitoring the low temperature corrosion process and state of a flue gas cooler, and relates to a synchronous online monitoring device for the low temperature corrosion process and state of a flue gas cooler. Background technique [0002] For thermal power plants, exhaust heat loss is the largest heat loss in the boiler, generally 5% to 8%, accounting for 80% of the total heat loss of the boiler or even higher. The main factor affecting the heat loss of exhaust gas is the exhaust gas temperature of the boiler. The actual operating value of the exhaust gas temperature of many power station boilers in my country reaches 130 °C to 150 °C, which is about 20 °C to 50 °C higher than the design value. Greatly improve the economy of power plant boilers. After actual calculation, it is found that the exhaust gas temperature can be reduced by about 35 ℃, the power generation cycle efficiency of the system can be in...

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Problems solved by technology

However, the above experimental devices only solve the short-term experimental problem of the low-temperature corrosion rate of materials, and the long-term low-temperature corrosion rate is based on the average or extrapolated value of the corrosion rate of the short-term experiment. It is known that when the unit is in normal operation, the actual operating pipe section of the flue gas cooler cannot be regularly cut for off-line testing to obtain the low-temperature corrosion rate of the actual operating pipe section; what is more difficult is that due to the synergistic effect of sulfuric acid dew point corrosion , there is no detection method that can monitor the low-temperature corrosion status of the actual heat exchanger tube bundle online. Therefore, it is necessary to invent a device that can simultaneously monitor the low-temperature corrosion process and state of the flue gas cooler. The same working conditions (including coal quality, load, etc.), but during the regular maintenance of the unit, the corroded pipe section of the device can be intercepted for off-line detection, thereby obtaining the low-temperature corrosion rate of the heat exchange tube. The above is the background of the present invention

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