Device for determining boiler flue gas engineering acid dew point

Abstract

The invention discloses a device for determining a boiler flue gas engineering acid dew point. The device includes a heat exchanger and a temperature control water tank. The heat exchanger has a barrel-shaped structure with an inner layer and an outer layer sleeved together, and one ends of the two layers are communicated. The outer layer of the same end of the two layers is communicated with the water inlet of the temperature control water tank through a pipeline. The inner layer is communicated with the water outlet of the temperature control water tank through a pipeline, and a flowmeter, a water pump as well as a water outlet valve that are disposed on the pipeline. The water inlet of the temperature control water tank is also communicated with a water replenishing pipeline. The outer wall of the heat exchanger is provided with a heat exchanger wall temperature sensor. The pipelines connected to the water inlet and water outlet of the temperature control water tank are respectively equipped with an inlet water temperature sensor and an outlet water temperature sensor. A heating unit is arranged in the temperature control water tank. The heat exchanger wall temperature sensor, the inlet water temperature sensor, the outlet water temperature sensor and the heating unit are respectively connected to a control system of the temperature control water tank. With no need of measuring a dew point, the device provided in the invention acquires the engineering acid dew point of the heat exchanger by calculating and observing heat exchange coefficients.

Description

technical field [0001] The invention relates to the field of energy and power engineering, in particular to a device for determining the sudden critical temperature (engineering acid dew point) of the heat exchange performance of a heat exchanger in the utilization of waste heat of flue gas at the tail of a boiler. Background technique [0002] Among the various losses of the boiler, the exhaust gas loss is the largest one. The test shows that for every 10-20°C increase in the exhaust gas temperature, the thermal efficiency of the boiler will decrease by about 0.6%-1%, and the corresponding more coal consumption will be 2-3g / KWh Therefore, it is of great practical significance for energy saving and emission reduction to make full use of the waste heat of boiler flue gas and reduce the exhaust gas temperature as much as possible. [0003] However, with the use of the waste heat of the flue gas at the tail of the boiler flue, the exhaust gas temperature will become lower. As ...

AI Technical Summary

Problems solved by technology

Although this method is relatively intuitive to observe, because the environment in which the flue gas is located needs to be changed, the wind speed and pressure will change, and the condensation characteristics of the flue gas in the test section may not be consistent with those in the flue. It is also difficult to accurately observe the condensation on the water pipe wall in a dusty environment with the naked eye

[0008] "Functional Development of Image Dew Point Measuring Instrument" (Analytical Testing Technology and Instruments, 2000) proposed a flue gas dew point measuring instrument that uses sensors to detect dew point on the mirror surface. The instrument also has a measurement environment that is different from the flue environment The problem

Moreover, there are operational difficulties in opening and connecting the test equipment in the boiler flue in actual operation, and these measurement methods are not suitable for field application in engineering

[0009] Based on the above reasons, due to the large ash content in the boiler flue gas, it is difficult to obtain the dew point accurately by the traditional dew point test method, and the temperature in the boiler flue is high and the sealing is strong, so it is difficult to directly observe, so there is no good determination of the heat exchanger. The method and device for sudden change critical temperature (engineering acid dew point) of heat exchange performance, engineering design is still mainly based on experience

This is not conducive to the full use of waste heat flue gas, and may bring safety hazards

Images