Power plant exhaust steam latent heat and smoke exhaust waste heat combined power generation system and optimal operation method

Abstract

A power station exhaust steam latent heat and exhaust smoke waste heat combined generating system is characterized in that a condenser / evaporator is communicated with a smoke overheater, the smoke overheater is communicated with a gas overheater of a gas boiler, the gas overheater is communicated with a pneumatic motor, the pneumatic motor is connected with a generator, the exhaust port of the pneumatic motor is communicated with an air cooling radiator communicated with a liquid storage box, and the liquid storage box is communicated with the condenser / evaporator through a working medium boosting pump; the condenser / evaporator is communicated with a turbine, and the condenser / evaporator is communicated with a steam power circulation condensation water pump; the boiler is communicated with the smoke overheater through an air preheater and an electrostatic dust collector, and the smoke overheater is communicated with a chimney through a desulfurization system. Or, the smoke overheater is communicated with the pneumatic motor and the gas overheater. The power station exhaust steam latent heat and exhaust smoke waste heat combined generating system has the advantages that the structure is simple and reasonable, the manufacturing cost is low, specially-required equipment does not exist, feasibility is good, especially, the unit energy utilization rate is increased, the power supply thermal consumption of a unit is reduced, energy is saved, and the environment protection effect is obvious. An optimizing running method of the power station exhaust steam latent heat and exhaust smoke waste heat combined generating system is provided.

Description

technical field [0001] The invention relates to the technical field of multiple low-temperature waste heat synergistic heat power generation, and relates to a combined power generation system and an optimized operation method of exhaust latent heat and smoke exhaust heat of a power station. Background technique [0002] Boiler exhaust smoke waste heat and steam power cycle exhaust steam latent heat are the main heat losses of coal-fired power plants, resulting in the power generation efficiency of large thermal power plants generally being around 40%, and it is about 60% of the heat loss that is released to the environment (cooling water and atmosphere middle), making it difficult to greatly increase the power generation efficiency of coal-fired units. [0003] Power plant boilers are the largest energy-consuming equipment in my country's industrial sector. In order to prevent the acid corrosion of the heating surface of the boiler tail and ensure the continuous and safe ope...

AI Technical Summary

Problems solved by technology

[0004] The concept basis of the present invention is, aiming at the characteristics of the existing steam turbine exhaust latent heat, low temperature, less flue gas residual heat, slightly higher temperature, and the deficiencies in the utilization of exhaust latent heat and flue gas exhaust heat, 1) this The invention proposes to use low-boiling point substances as working fluids, such as green working fluids such as ammonia, carbon dioxide, and organic working fluids. The latent heat of exhaust steam in coal-fired power stations is used as the heat source for the working medium evaporator, and the exhaust heat is used as the heat source for the primary superheater of the working medium. The exhaust steam latent heat and exhaust waste heat combined power generation system with gas as the heat source of the secondary superheater of the working medium, through the coupling of exhaust steam latent heat, coal-fired boiler exhaust heat and gas series connection, provides a larger flow rate, The superheated steam with a higher temperature can significantly increase the working capacity and cycle thermal efficiency of the low-temperature working medium Rankine cycle; 2) The present invention proposes an optimal operation method for the combined power generation system of power plant exhaust steam latent heat and exhaust smoke waste heat. With the change of ambient temperature, through Optimize and adjust steam turbine exhaust pressure and temperature, adjust steam turbine and air motor power generation, aim at maximizing the sum of steam turbine and air motor power generation, optimize and analyze unit operating characteristics under different ambient temperatures; Use the first-level overheating of exhaust waste heat, use low-temperature resources in the environment to reduce the steam exhaust parameters of the air motor, increase the enthalpy drop of the air motor unit, and realize full-load power generation. Under the working conditions provided by the air motor exhaust parameters caused by the ambient temperature, the gas intake parameters of the air motor can be increased through the secondary overheating of the gas, and the enthalpy drop of the air motor unit can be increased to maintain the full load power generation of the air motor unit

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