Hot air furnace with function of jetting individual premixed gas streams to flow back into preheating regenerator to be combusted

Abstract

The invention relates to a hot air furnace with a function of jetting individual premixed gas streams to flow back into a preheating regenerator to be combusted. Various problems caused by mixed combustion of coal gas and air in a large-volume combustion chamber are effectively solved. A premixed gas nozzle and a hot air outlet pipe are arranged on a precombustion chamber wall, the premixed gas nozzle is communicated with a jet mixer, a coal gas inlet pipe and an air inlet pipe are arranged on the jet mixer, a combustion chamber, a regenerative chamber and a cold air chamber which are positioned below a precombustion chamber inside the precombustion chamber wall are arranged in space formed by a hot air furnace wall and a furnace hearth, the hot air furnace wall is arranged on the lower portion of the precombustion chamber wall and is fixed onto the furnace hearth, a distributing structure arranged on the furnace hearth is disposed on the lower portion of the regenerator stacked in the combustion chamber and the regenerative chamber, the upper portion of the hot air furnace wall is sleeved with the lower portion of the precombustion chamber wall, and a flue gas outlet pipe and a cold air inlet pipe are arranged on side walls of the cold air chamber. The hot air furnace effectively solves critical problems of unstable combustion of low-heat-value coal gas, low combustion intensity and combustion temperature, uneven temperature distribution and gas stream distribution, and the like.

Description

technical field [0001] The invention relates to a premixed airflow single-jet backflow preheating regenerator for burning in a hot blast furnace which provides high-temperature blast for a blast furnace. Background technique [0002] At present, considering energy saving and consumption reduction, blast furnace hot blast stoves are required to obtain high performance and high benefits under the combustion of low calorific value blast furnace gas, and finally achieve the goals of high efficiency, energy saving, environmental protection, and increased production. Therefore, completing the enhanced combustion process and efficient heat transfer process in the hot blast stove and combining them organically is a necessary condition to achieve the above goals, which involves the performance of the combustion device, the structure and arrangement of the heat storage body, and the organization of the air flow field. Looking at the various hot blast stoves currently in use, their ga...

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Problems solved by technology

[0003] In view of the above situation, in order to overcome the defects of the existing hot blast stove, the object of the present invention is to provide a hot blast stove that burns in the preheated regenerator with a single jet of premixed airflow, which can effectively overcome the problem of coal gas and air in a large volume combustion chamber. Many problems are prone to occur in the medium mixed combustion mode, such as low mixing rate of gas and air, uneven mixing, and the resulting low combustion intensity, low combustion temperature, incomplete combustion, complex burner structure, complex nozzle structure, burner Difficult production, instability of hot blast stove structure, etc.

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