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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

Active Publication Date: 2018-11-27
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) Most power plants have not installed flow measuring devices in the water side pipeline of the low temperature economizer, so it is impossible to know the water side flow of the low temperature economizer
[0006] (2) The power plant does not know how to determine the opening of the control valve to ensure the best energy-saving effect of the low-temperature economizer, so the control valve is often fully open during operation
[0007] (3) All power plants equipped with low-temperature economizers have no logic to automatically control the valve opening to maximize the thermal economy of low-temperature economizers

Method used

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

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Embodiment 1

[0040] A low-temperature economizer 1 optimal operation control system, including a low-temperature economizer 1, a water-side inlet pipeline 91 and a water-side outlet pipeline 92, and the low-temperature economizer 1 passes through the water-side inlet pipeline 91 The connecting pipeline 92 on the water side is connected across the two ends of the recuperation heater 4, and the control valve 6 is installed on the water-side connecting pipeline 91 at the inflow end of the low-temperature economizer 1, which is characterized in that: A condensate flowmeter 7 is also provided on the pipeline 91, and the condensate flowmeter 7 is installed on the downstream side of the control valve 6, and a No. Temperature instrument 22, the No. 2 temperature instrument 22 is set on the upstream side of the inlet of the water side access pipeline 91, and No. 3 temperature instrument 23 is installed on the downstream side of the condensate flow meter 7, and the pipeline is connected to the water ...

Embodiment 2

[0045] The present invention also provides a control method for the optimal operation control system of the above-mentioned low-temperature economizer 1, which is characterized in that the steps are as follows:

[0046] Step 1. Adjust the opening of the control valve 6 to 20% through the DCS control system, and calculate the heat absorption Q of the low-temperature economizer 1 under the current state DW-1 , record the flow q of the condensate flowmeter 7 in the current state 1 ;

[0047] Q DW-1 =q 1 (h 1 smq -h 1 j+1 )

[0048] where h 1 smq is the current outlet water enthalpy value of low-temperature economizer 1, and is the temperature obtained by No. 4 temperature meter 23 in the current state and the acquired pressure P of the pressure gauge 8 1 , obtained by using the water vapor function formula, h 1 j+1 is the current inlet water enthalpy value of low-temperature economizer 1, and is the temperature obtained by No. 3 temperature instrument 24 in the curr...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22D1/34F22D5/34
CPCF22D1/34F22D5/34
Inventor 吕松松阮圣奇吴仲陈裕胡中强任磊陈开峰邵飞徐钟宇蒋怀锋王松浩许昊煜
Owner CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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