Energy-saving and emission-reducing gas-fired boiler pre-heating method and facility

Abstract

The invention relates to an energy-saving and emission-reducing gas-fired boiler pre-heating method and facility. A steam heat source is led from a steam supply system to a heat exchanger, a cold-endwater source is heated by the heat exchanger and then feeds water to an upper boiler barrel of a pre-heating boiler, and a fixed-discharge pipeline of a lower boiler barrel of the pre-heating boiler is connected with a branch pipeline to lead water discharged from the fixed-discharge pipeline into the heat exchanger to serve as the cold-end water source. According to the method, discharged water of the pre-heating boiler is heated by the heat exchanger and then flows back into the pre-heating boiler again to continuously heat and pre-heat the pre-heating boiler, steam of the steam supply system is led from the heat source of the heat exchanger, and combustion does not exist in the process, so that wind and smoke loss is avoided, and NOX pollutants are also avoided. By using the method to pre-heat a standby boiler, the boiler starting time can be shortened, and discharge capacity caused by an overlarge initial peroxide air coefficient due to slow load in the initial starting stage of the boiler is reduced.

Description

technical field [0001] The invention relates to the technical field of environmental protection and energy saving, in particular to a gas boiler preheating method and facilities for energy saving and emission reduction. Background technique [0002] In order to reduce the emission of air pollutants, the state encourages enterprises to replace pulverized coal boilers by burning gas boilers to generate steam and heat. At present, in order to ensure the reliability of steam supply of gas-fired boilers, the company always sets the peak load to run a backup redundant configuration when setting up gas-fired boilers. After a certain boiler fails, the other boiler can quickly Start up and replace the faulty boiler to ensure gas reliability. [0003] In order to ensure quick start, the spare boiler has to use fuel to heat the furnace for a long time to increase the internal temperature of the boiler to achieve the purpose of quick start of the spare boiler. This method of preheatin...

AI Technical Summary

Problems solved by technology

[0004] 1. When the fuel is low-load and stable, the boiler will lose a lot of heat through the exhaust system of the boiler through the excess air, which is not energy-saving;

[0005] 2. When the boiler is under low load and stable combustion, the standard oxygen generated is converted into NO X The emission is much greater than the NO produced by the normal combustion of the boiler X will cause serious pollution to the environment

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