System for heating natural gas through gradient utilization of water supplied at medium pressure from waste heat boiler of gas turbine power plant

Abstract

The invention discloses a system for heating natural gas through the gradient utilization of water supplied at medium pressure from a waste heat boiler of a gas turbine power plant. The system comprises a property heater, a natural gas heater and a pipeline I, wherein the pipeline I is connected with the water outlet of the property heater and the water inlet of the natural gas heater; the gas inlet and the gas outlet of the property heater are connected with a natural gas inlet pipeline II and a natural gas outlet pipeline II, respectively; the gas inlet and the gas outlet of the natural gas heater are connected with a natural gas inlet pipeline III and a natural gas outlet pipeline III, respectively. The system disclosed by the invention can enhance the temperature of the natural gas by about 11 DEG C on a pressure regulating station module, thereby saving a large amount of natural gas combusted in a water bath furnace scheme and saving energy resources. According to the system, a 9F-grade gas turbine saves the cost of natural gas greatly every year.

Description

technical field [0001] The invention relates to a natural gas heating system, in particular to a gas turbine power plant waste heat boiler medium-pressure feed water cascade heating system. Background technique [0002] For gas turbine power plants, in order to ensure the stable combustion of gas turbines, there are some restrictions on the natural gas supplied, mainly in terms of composition, calorific value, temperature, pressure, condensable gas, solid particles, and sulfur content in natural gas. Before the natural gas enters the gas turbine, the natural gas needs to be processed, mainly to remove the solid particles and liquid droplets of the natural gas, and adjust the temperature and pressure of the natural gas to the specified value, so that the natural gas entering the gas turbine meets the technical specifications of the gas turbine manufacturer for natural gas. [0003] Natural gas processing is divided into two modules: pressure regulating station module and fron...

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Problems solved by technology

It is quite wasteful to heat natural gas with a water bath furnace, not only does not make full use of the cold energy of natural gas, but also consumes a large amount of natural gas in vain

In addition, the scaling and corrosion of the coils of the water-bath furnace are serious, requiring regular maintenance, which greatly reduces the usability of the water-bath furnace

[0006] 2. Electric heater heating scheme: electric heater is used to heat natural gas. The initial investment of this scheme is small, but the operation energy consumption is high, and a large amount of electric energy is consumed, which greatly increases the power consumption of the power plant and reduces it in the long run. Power Plant Economics

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