A metallurgical gas-fired boiler combustion optimization control system

Abstract

The invention discloses an optimization control system of a metallurgical gas boiler, and relates to the technical field of control of metallurgical gas boilers. The system comprises a steam pocket liquid level control loop, a main steam temperature control loop, a hearth pressure control loop, an air supply control loop, an air-fuel ratio optimization controller and a load control loop. According to the system, automatic control over the gas boiler is achieved, all technical indexes meet the running index of the gas boiler, and through air-fuel ratio optimization, gas can be sufficiently combusted, smoke exhaust looses caused by the too large air quantity are avoided, and therefore energy-saving and consumption-reduction aims of the boiler are achieved; the problems that the steam pocket water level, the hearth pressure and the gas pressure are unstable, a false liquid level exists, the air amount and the gas amount are hard to automatically control, and the main steam temperature is hard to precisely control are solved; and in-advance pre-adjustment and in-advance action are achieved, self-optimization of the air-fuel ratio is achieved, combustion is more stable, and the aims of saving energy and reducing emissions are achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgical gas boiler control, in particular to a combustion optimization control system for a metallurgical gas boiler. Background technique [0002] Metallurgical gas-fired boilers use blast furnace gas, coke oven gas, and converter gas generated during the production process as raw materials to produce steam, which is used for steam turbine power generation or to drive other fans. [0003] In recent years, my country's economic development has brought serious environmental pollution problems, such as floating dust, tail gas, soot and other harmful substances produced in energy applications, which are always damaging people's health, and have also brought great challenges to environmental governance. However, if the blast furnace gas, coke oven gas, and converter gas produced by iron and steel enterprises in the production process are not used and released directly, it will not only waste energy, but ...

AI Technical Summary

Problems solved by technology

[0008] From the above control methods, it can be seen that most of the current water level control adopts the traditional three-impulse control method, which does not consider the combustion factor. When there is a large change in combustion, a large false liquid level is prone to occur, and the control accuracy cannot be guaranteed; the main steam temperature control adopts The cascade control method of temperature and water volume, but for the general site, the measurement deviation of desuperheating water volume is very large, which is difficult to use in the actual site. At the same time, single-loop control is adopted, and the control point is fixed. When the load fluctuates, the fixed control point It is inappropriate; the load control is based on the air-fuel ratio to distribute air, but the influence of factors such as oxygen content, gas calorific value, gas pressure and air pressure on the load has not been resolved

[0009] To sum up, there are still some limitations and defects in the existing technology, so this control system is proposed

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