Efficient and adjustable vacuum control method and system used for power plant

A vacuum control and high-efficiency technology, which is applied in steam/steam condensers, lighting and heating equipment, etc., can solve the problems of difficult control of manual valves, impact on unit operation safety, difficulty in maintaining design conditions, etc., to improve work efficiency, Avoiding safety risks in unit operation, good performance and efficiency

Active Publication Date: 2017-10-13
DATANG DONGBEI ELECTRIC POWER TESTING & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the actual operation of the unit, due to environmental and equipment factors, it is difficult for the unit to maintain the design rated vacuum operation, and it is also difficult to achieve the best vacuum of the unit through the vacuum system.
Moreover, as the vacuum of the unit changes, the suction flow rate of the vacuum pump also changes greatly, making it difficult to maintain the design working condition
[0005] During the start-up stage of the

Method used

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  • Efficient and adjustable vacuum control method and system used for power plant
  • Efficient and adjustable vacuum control method and system used for power plant
  • Efficient and adjustable vacuum control method and system used for power plant

Examples

Experimental program
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Effect test

Embodiment 1

[0063] Such as figure 1 As shown, the high-efficiency adjustable vacuum control method used in power plants in this embodiment includes:

[0064] The steam extraction ports on the condenser are respectively connected with a main steam extraction device, and the main steam extraction device includes a positive displacement vacuum pump communicated with the steam extraction port on the condenser through a main steam extraction pipeline. The vacuum pump is connected in series with a final-stage water circulation vacuum pump; the positive displacement vacuum pump is electrically connected to a variable frequency motor, the positive displacement vacuum pump is driven by a variable frequency motor, and the variable frequency motor is connected to a controller; the vacuum control method of the condenser includes:

[0065] Collect parameters that affect the vacuum of the condenser, the parameters include: condenser cooling water inlet temperature t w1 , steam turbine condensing steam...

Embodiment 2

[0086] This embodiment is used in a high-efficiency adjustable vacuum control system of a power plant, including: a condenser 1, and the steam extraction ports on the condenser are respectively connected with a main extraction device and a standby steam extraction device, wherein the main extraction The steam device includes a volumetric vacuum pump 4 communicated with the steam extraction port on the condenser through the main steam extraction pipeline, and the volumetric vacuum pump is connected in series with a final water circulation vacuum pump 5; between the volumetric vacuum pump and the condenser The main steam pipeline between them is provided with a first switching valve 2; the positive displacement vacuum pump is electrically connected to a variable frequency motor, and the positive displacement vacuum pump is driven by a variable frequency motor 7; a measuring unit 8 is connected to the condenser, The measuring unit includes: a temperature sensor for measuring the i...

Embodiment 3

[0106] This embodiment is used in the high-efficiency adjustable vacuum control system of the power plant. On the basis of Embodiment 2, it also includes a backup steam extraction device (not shown in the figure), and the backup steam extraction device includes a vacuum connected to the condenser. The standby steam extraction pipeline is connected in series with a primary water circulation vacuum pump and a secondary water circulation vacuum pump; the standby steam pipeline between the primary water circulation vacuum pump and the condenser is provided with a second on-off valve. The first on-off valve and the second on-off valve described above are electric valves, pneumatic valves or manual valves.

[0107] The spare steam pipeline between the primary water circulation vacuum pump and the condenser is provided with a second on-off valve, and the first on-off valve and the second on-off valve are electric valves, pneumatic valves or manual valves.

[0108] The inlets of the p...

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Abstract

The invention relates to an efficient and adjustable vacuum control method and system used for a power plant. The method comprises the steps that the vacuum target value of a real-time condenser is obtained by collecting, calculating and analyzing vacuum influencing parameters and conducting necessary correction; the vacuum target value is used as a regulating command through a control unit and sent to an efficient vacuum pump set executing mechanism, the input and output power of an efficient vacuum pump set is regulated, and target vacuum of a unit and the minimum power input of the vacuum pump set are obtained. Gas coolers are designed at the front end of a volume type main pump and at the front end of a water ring pump, and sucked gas is cooled so as to improve the efficiency of the pump set. Vacuum pump set capacity selection is carried out according to set discharge capacity corresponding standards, it is guaranteed that non-condensable gas of the set under different working conditions can be continuously pumped out, and smooth and steady adjustment of overall pumping flow of the pump set is realized by changing the input frequency of the main pump.

Description

technical field [0001] The invention relates to the field of vacuum maintenance and energy saving of condensers in power plants, in particular to an efficient and adjustable vacuum control method and system for power plants. Background technique [0002] The steam turbine condenser is an important part of the thermal power plant. It plays the role of a cold source in the thermal cycle of the condensing steam unit. The exhaust steam of the steam turbine is condensed in the condenser, and a vacuum is formed in the condenser, and the steam condenses into The water is then sent to the boiler system to complete the thermal cycle. The vacuum degree of the unit is one of the important indicators affecting the economy and safety of the unit. With the inlet steam temperature unchanged, the thermal efficiency of the unit increases by about 3.5% for every 10°C decrease in the exhaust steam temperature of the turbine; within the safe back pressure range of the unit, when the back press...

Claims

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Application Information

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IPC IPC(8): F28B9/10F28B11/00
CPCF28B9/10F28B11/00
Inventor 王兆彪
Owner DATANG DONGBEI ELECTRIC POWER TESTING & RES INST
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