One-button start-stop and interlock protection control method of jet pump in condenser vacuum system

Abstract

The invention discloses a one-button start-stop and interlock protection control method of a jet pump in a condenser vacuum system. The condenser vacuum system includes an electric pump part and a steam injection part. The electric pump part has three electric pumps. There are two first-stage jet pumps A, B, one second-stage jet pump, one third-stage jet pump and a first-stage heat exchanger, a second-stage heat exchanger, and a third-stage heat exchanger; the power steam of four jet pumps The source is the auxiliary steam main pipe. The suction ports of the primary jet pumps A and B and the suction ports of the three electric pumps are connected to the vacuum main pipe of the condenser. After the first-stage heat exchanger is cooled by condensate, it is sucked by the second-stage jet pump and discharged to the second-stage heat exchanger. After cooling again, it is sucked by the third-stage jet pump and discharged to the third-stage heat exchanger, and finally drained to condensate heat. well. The invention has convenient operation and good effect.

Description

Technical field [0001] The present invention relates to a one-button start stop and interlock protection control method of a condenser vacuum system jet pump. Background technique [0002] The current coal-fired fire power unit energy-saving technology reform work is basically aggregated from two levels of machine, furnace body transformation and transfer frequency conversion, Jiangsu Nantong Power Plant attempts to measure problems from the cold-end system, in the case of pumping vacuum in the original centrifugal vacuum pump, A steam jet pump is applied at the vacuum masterpiece. Since the steam spray pump dynamic source is high pressure steam, it can effectively reduce the power rate. [0003] However, the safety of the production process of the power plant should be higher than the economy, the original three mutually independent electric vacuum pumps, interlocking, and can effectively protect the large machine vacuum system. However, the new steam injection system is only co...

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Problems solved by technology

However, the new steam injection system only has two first-stage injection pumps connected to the main pipe, sharing a set of terminal heat exchangers, and there is no redundant equipment. For a technology that has not yet been applied on a large scale in the power industry, there is a big problem risk

Secondly, since the steam injection system is divided into multi-stage vacuum injection pumps and heat exchangers, and the power source is auxiliary steam, it is easy to disturb the pressure of auxiliary steam. And the intake valve, the operation is cumbersome, and it will easily affect the stability of the vacuum system of the large machine

[0004] The main reasons for the above defects can be summarized into two points, one is that the vacuum ejection system does not have a redundant vacuum ejection pump on the hardware, and the other is that the software lacks automatic control methods and interlock protection

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