Cold source temperature control method and device of flue gas waste heat recovery device

Abstract

The invention relates to a cold source temperature control method of a flue gas waste heat recovery device. The method mainly comprises the steps of parameter collection, data processing, fuzzy reasoning, controlled quantity outputting, controlling execution and the like. The method specifically comprises the steps of: calculating a temperature error e and a temperature difference change ec with a reference set temperature by collecting parameters such as cold water temperature, hot water temperature, temperature of a mixed water tank, heat exchange wall temperature and exit gas temperature in the flue gas waste heat recovery device; and then, obtaining control parameters by fuzzy reasoning, and adjusting the cold source temperature by controlling a cold source water electric adjusting executor and a flowback water electric adjusting executor through the parameters. According to the invention, with the adoption of an advanced fuzzy predicting method, deviation, size change and direction as well as time relationship of the controlled volume are effectively pre-compensated according to a fuzzy rule established by real time identification of the system, so that short of adjustment or over-adjustment is prevented, the influence to the performance of the control system due to great inertia and large hysteresis in the controlled process is improved, and the control quality is improved.

Description

technical field [0001] The invention relates to the field of waste heat recovery, and relates to a cold source temperature control method and device for flue gas waste heat recovery equipment that can automatically track and clamp the lowest wall temperature of a single-stage or multi-stage cold end to be above the acid dew point and within a fixed value range. Background technique [0002] The exhaust gas temperature of the factory design and operation of the boiler accounts for a large proportion of the heat loss of the boiler. Making full use of the waste heat of the exhaust gas not only meets the requirements of energy conservation and emission reduction policies, but also reduces the energy cost of the enterprise at the same time. [0003] At present, flue gas waste heat utilization equipment is gradually being commercialized. Waste heat technology in flue gas can be divided into direct heat exchange and indirect heat exchange. [0004] (1) The direct heat ...

AI Technical Summary

Problems solved by technology

The specific performance is: in the traditional control system, when the control command is issued, a cold source temperature adjustment cycle has not yet ended or the controlled object has not responded in time, and the system operating environment may change again. At this time, the control system collects After the new parameter is changed, a new control instruction will be issued, which will cause the system to oscillate and cause the wall temperature to fluctuate to a certain extent. It cannot reach the set value for a period of time, that is, it cannot maintain its wall temperature at the acid temperature. Above the dew point, it is difficult to obtain the expected control effect

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