Power supply method for a phosphate fertilizer enterprise to run on a turbine generator isolated network when the main network is out of power

Abstract

The invention discloses a power supply method for a phosphate fertilizer enterprise to run on a turbine generator isolated network when the main network is out of power, in the event of power failureor fault trip of the main network, an eighth circuit breaker and a ninth circuit breaker are interlocked to trip, a 1 # turbo-generator runs on an isolated network for supplying power to the first-stage unit of a sulfuric acid workshop, a 2 # turbo-generator runs on an isolated network for supplying power to the second-stage unit of the sulfuric acid workshop. When the main network is restored tonormal power supply, the first-phase unit and bus of the sulfuric acid workshop will be switched on by 1 # turbo-generator through the eighth circuit breaker from the 2 # synchronization point of 1 #turbo-generator to grid-connected unit, and will be fed into the main network. The second-phase unit and bus of the sulfuric acid workshop shall be switched on and put into the main network by 2 # turbo-generator through the ninth circuit breaker from the 2 # synchronization point of 2 # turbo-generator to grid-connected unit. The invention solves the problems that when the power loss or fault ofthe main network occurs or overhaul is performed, the independent power supply operation of the isolated network is realized, thereby ensuring that the first-stage unit of the sulfuric acid workshop and the second-stage unit of the sulfuric acid workshop do not lose power and ensuring the normal operation of the device.

Description

technical field [0001] The invention belongs to the field of power grids, and in particular relates to a power supply method for phosphate fertilizer enterprises using a steam turbine generator to operate in an isolated grid when the main grid loses power. Background technique [0002] In the existing chemical fertilizer enterprises that produce phosphate fertilizers (including monoammonium, diammonium, and heavy calcium), in order to make full use of the steam waste heat in the production process of the sulfuric acid workshop, the company will prepare a group of turbo generators outside the sulfuric acid workshop in advance to supply power externally. When the power supply network (hereinafter referred to as the main network) is normally powered, the turbo-generator can make full use of the excess steam in the production process of the sulfuric acid workshop to generate electricity, and incorporate the electric energy generated by the turbo-generator into the internal produc...

AI Technical Summary

Problems solved by technology

[0003] In the production process, unexpected situations such as power failure of the main network are often encountered. For example, when the incoming power supply of the main network loses power due to a fault, or the main network loses power due to a power outage due to maintenance, the tripping of the incoming circuit breaker of the main network will cause the entire production system of the enterprise to fail. Power-off shutdown; when the busbar of the main network fails, it will also cause the incoming circuit breaker to trip, and will also cause the entire production system to be powered off and shut down; when the main network has a planned power outage or maintenance, it will also cause the entire production system to lose power parking

[0004] Due to the occurrence of the above situation, the equipment in the sulfuric acid workshop in the phosphate fertilizer enterprise will lose power and stop, and the failure and power outage will cause great damage to the boiler in the sulfuric acid workshop. Because the boilers and other equipment in the sulfuric acid workshop are operating at high temperature, the power failure will cause the boiler to fail to start. The water boiler burned dry, seriously damaging the equipment, and the liquid sulfur delivery pipeline in the sulfuric acid workshop was easy to solidify and block due to no steam insulation

After the power supply is restored, it is necessary to re-burn the oil-fired boiler to generate steam to heat the liquid sulfur delivery pipeline to melt and solidify the liquid sulfur. It takes a long time to start up again, and the start-up cost is high

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