Intelligent control method of automatic optimizing combustion of hot blast heater
A technology of intelligent control and hot blast stove, which is applied in the direction of combustion method, combustion control, furnace, etc., can solve the problems that the air-fuel ratio cannot be changed, the application effect is not ideal, and the life of the oxygen measuring instrument is limited, so as to improve the combustion control level and energy consumption. Full utilization and high heat storage capacity
Inactive Publication Date: 2010-11-10
WISDRI ENG & RES INC LTD
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Problems solved by technology
The proportional extreme value adjustment method cannot change the air-fuel ratio in time when the calorific value of the gas changes, and it is not easy to achieve the best combustion of the hot blast stove
The flue gas oxygen content cascade proportional control method uses the ratio adjustment as a rough adjustment, and the oxygen content feedback control in the flue gas as a fine adjustment to control the air and gas volume. This method can achieve a more reasonable combustion of the hot blast stove, but Due to the limited life of the oxygen measuring instrument, coupled with inadequate management and maintenance, the oxygen measuring instrument of many enterprises cannot work stably for a long time. Therefore, the application effect of this method is not ideal.
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[0022] The ratio of combustion-supporting air to mixed gas (that is, the air-fuel ratio) is an important parameter in the combustion process of the hot blast stove. If the mixed gas is too much, the combustion will be insufficient, and the excess gas will be discharged into the atmosphere along with the combustion waste gas, which is not only a waste, but also a kind of pollution to the atmosphere; if the mixed gas is insufficient, the temperature of the top of the hot blast stove cannot be guaranteed to reach the set value. Value, that is, the heat stored in the hot blast stove is insufficient to meet the normal production of the blast furnace. Therefore, how to maximize the combustion rate of gas on the premise of ensuring the normal production of the blast furnace has great significance, which requires the best air-fuel ratio control. But under no circumstances can excessive gas be used. In other words, the air at the optimum air-fuel ratio is still in excess.
[0023] Th...
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The invention provides an intelligent control method of automatic optimizing combustion of a hot blast heater, which calculates on the basis of the total heating load. By setting the temperature of a burning arch crown and a waste gas temperature goal value, an air-fuel ratio fuzzy controller searches the optimum air-fuel ratio coefficient in real time in a combustion cycle so as to adjust the combustion air flow and the mixed gas flow in real time; the combustion air flow is controlled by a waste gas temperature adjuster, a heating load adjuster and a combustion air adjuster; the mixed gas flow is controlled by an arch crown temperature adjuster and a mixed gas adjuster; and the air-fuel ratio is controlled by an air-fuel ratio fuzzy controller. The invention can improve the combustion control level of the hot blast heater, has high combustion efficiency, full energy utilization and strong heat storage capacity.
Description
technical field [0001] The invention is used for the combustion control of the ironmaking blast furnace hot blast stove system in the metallurgical industry. Background technique [0002] The hot blast stove is an important supporting equipment in the blast furnace ironmaking production process. Its main function is to heat the blast to the required temperature and provide high-temperature hot air to the blast furnace. The blast furnace is generally supplied with air alternately by 3 to 4 hot blast stoves, and the working process of each hot blast stove is a repeated process of combustion and air supply. After the gas and combustion-supporting air are mixed in the burner, they are burned in the combustion chamber to generate high-temperature flue gas. The checker brick in the regenerator is the carrier of heat transfer, it absorbs heat during combustion, and transfers heat to cold air during air supply, thereby heating the cold air. [0003] In order to save energy and rea...
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IPC IPC(8): F23N1/02C21B9/00
Inventor 周磊马智慧
Owner WISDRI ENG & RES INC LTD