A control method for an optimal operation control system of a low-temperature economizer

A low-temperature economizer and control system technology, applied in the direction of controlling feed water, feed water heaters, lighting and heating equipment, etc., can solve the problem of installing flow measurement devices, unable to understand the water side flow of low-temperature economizers, and the thermal power of low-temperature economizers Economical and other issues, to achieve the effect of maximizing energy saving benefits
CN106224936BActive Publication Date: 2018-11-27CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
Publication Date
2018-11-27

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Abstract

The invention discloses a low-temperature coal economizer optimal operation control system and a control method thereof. The low-temperature coal economizer optimal operation control system comprises a low-temperature economizer, a water side inlet pipeline and a water side outlet pipeline; and a control valve is mounted on the water side inlet pipeline at a flowing-in end of the low-temperature economizer. The low-temperature coal economizer optimal operation control system is characterized in that a condensed water flow meter and temperature instruments and pressure instruments 2-5 are arranged on the water side inlet pipeline. Compared with the prior art, the low-temperature coal economizer optimal operation control system has the following advantages: the heat load characteristics of the low-temperature coal economizer are calculated by the performance test; the heat load and low-temperature coal economizer water side flow q relation is fitted as a function to calculate an optimal water side flow calculating formula with innovativeness and applicability, which is the foundation of realizing automatic control; all signals are sent to a DCS control system; and the valve openness is automatically calculated and controlled according to the formula, so that the operator monitoring and operation burdens are saved, and the maximization of energy saving benefit of the low-temperature coal economizer can be realized all the time.
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Description

technical field

[0001] The invention relates to the technical field of energy-saving control in thermal power plants, in particular to a method for optimizing the operation of a low-temperature economizer in a thermal power plant and a control system. Background technique

[0002] The exhaust gas temperature after the boiler air preheater in thermal power plants is relatively high, generally 110-130 °C, especially for boilers burning high-sulfur coal or lignite, the exhaust gas temperature is about 150 °C, so it is reasonable to recover this part of waste heat. For power plants Energy saving is of great significance.

[0003] The principle of the low-temperature economizer is to draw part or all of the condensed water from the low-pressure heater of the steam turbine, send it to the low-temperature economizer on the boiler side, absorb the waste heat of the flue gas, reduce the exhaust gas temperature, and return the condensed water after absorbing the waste heat to the ther...

Claims

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