Industrial steam turbine asynchronous power generation-based energy-saving system and energy-saving control method

Abstract

The invention relates to an industrial steam turbine asynchronous power generation-based energy-saving system and an energy-saving control method. The system comprises a temperature and pressure reducer and at least one back pressure type steam turbine generator unit, wherein the temperature and pressure reducer is connected with a medium- and low-pressure steam incoming main pipe; an inlet steampipeline system is arranged between the temperature and pressure reducer and the medium- and low-pressure steam incoming main pipe; an outlet steam pipeline system is arranged between the temperatureand pressure reducer and a steam using device; the back pressure type steam turbine generator unit is connected with a temperature reducing device; the temperature reducing device is connected with the inlet main pipe of the steam using device; each pipeline is provided with a manual or electric regulating valve; the temperature and pressure reducer, the back pressure type steam turbine generatorunit, the steam using device, each electric regulating valve are controlled by a DCS / PLC automatic control system; steam enters the back pressure type steam turbine asynchronous generator unit; and the unit does work and generates power through the impact steam. With the system and method of the invention adopted, cost can be saved; and a construction period and project cost are 1 / 2-2 / 3 of those of a synchronous unit with the same installed capacity as the system of the invention. The system and the method can be suitable for common industrial fields such as the phosphorus compound fertilizerchemical industry, the petrochemical industry, the smelting metallurgy industry, the papermaking light textile industry and the like.

Description

technical field [0001] The invention relates to an energy-saving system, in particular to an energy-saving system based on industrial turbine asynchronous power generation, and also relates to an energy-saving control method. Background technique [0002] In the production process of many factories, production processes such as heating, drying, and evaporation all require steam as a heat source to varying degrees, and most of these medium and low pressure steams come from the company's own production, and the pressure level is usually 3.43~4.0MPa380~430℃ , the lower 0.5~1.6MPa150~280℃ cannot be directly used in the production process. [0003] Front end (medium and low pressure steam production or steam supply side): On the one hand, the commonly used solution is to use traditional pure condensing steam or extraction condensing steam or back pressure synchronous generator units for effective energy recovery and power generation. Larger, larger investment, more complex contr...

AI Technical Summary

Problems solved by technology

[0006] At present, domestic waste heat power generation generally adopts the technology and specifications of thermal power plants, adopts synchronous generators and configures complex speed control systems, excitation, synchronous devices, etc., without considering the instability of heat sources for power generation with waste heat from steam factories (commonly known as self-provided power plants) And intermittent characteristics, the use of synchronous motors is prone to failure and due to frequent start and stop will not only reduce the life of the equipment but also be affected by the fluctuation of the heat source, the output power of the generator is unstable when the output is low, the three-phase current is unbalanced, and the excitation device is damaged. Power factor adjustment function does not work

However, there is currently no comprehensive energy-saving technology that is suitable for cogeneration of heat and power after waste heat power generation replaces the desuperheater and pressure reducer for steam-using devices.

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