Coke-oven heating system with variable heating height for gas-rich heating and adjustment method thereof

Abstract

The invention relates to a coke-oven heating system with variable heating height for gas-rich heating and an adjustment method thereof. The coke-oven heating system comprises small flues, a controllable heat exchange passage, a combustion-supporting gas passage and a combustion chamber connected in order from bottom to top. The number of controllable heat exchange passages corresponding to each combustion chamber is at least two, each of the combustion-supporting gas passages is composed of a lower inclined section and an upper straight section, each of the combustion-supporting gas passages are communicated with a vertical flue through at least one airflow outlet, and at least one of the airflow outlets on each combustion-supporting gas passage is located at a different height; one end ofthe small flue is connected to a branch flue through a small flue connecting pipe and an exhaust gas shutter, and the small flue connecting pipe is provided with an air inlet and an intake air flow adjusting device; a plurality of exhaust disks corresponding to each small flue are arranged in the exhaust gas shutter. The invention can change the height position of the combustion in the vertical flue at any time according to the need to ensure that the heat distribution meets the production demand, and the adjustment method is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of combustible gas down-injection coke ovens, in particular to a coke oven heating system with variable heating height and rich gas heating and an adjustment method thereof. Background technique [0002] With the transformation of modern production methods, coke ovens have put forward higher requirements, such as uniform heating, large production capacity, small heating system resistance, and convenient adjustment and control. In order to control the combustion temperature in the vertical flue and improve the uniformity of heating in the vertical direction in the vertical flue, the existing down-spray coke ovens in my country adopt methods such as high and low lamp heads, exhaust gas circulation, and sectional supply of combustion-supporting gas. Such as Figure 1-Figure 3 As shown, it is a coke oven heating system adopting the above-mentioned measures. The combustion-supporting gas enters the chute 2 from t...

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Problems solved by technology

In the furnace body design stage, the distribution of the regulating bricks can only be determined through theoretical calculations, but the distribution ratio of the two parts of the gas flow cannot be quantitatively determined in actual production, so the error is large. After the coke oven is put into production, especially for a long time Finally, the adjusting bricks will be bonded to the partition wall bricks, and the high temperature in the vertical fire channel will make the adjusting bricks’ adjusting device invalid. Channel temperature distribution

Especially when the production state of the coke oven changes, since the heating at the bottom and middle and upper parts of the vertical flue cannot be adjusted, the heating uniformity of the coke oven will deteriorate and the heat consumption of coking will increase.

[0003] In addition, ramp 2 adopts a Y-shaped bifurcated structure, which is complicated in structure and increases the difficulty of design. Masonry is difficult, because the circulation structure is complex, which increases the system resistance and is not conducive to the circulation of combustion air

[0004] At present, when the coke ovens with a height of 6 meters or more put into production in China are heated by rich gas, the nitrogen oxide emission level is higher than 500mg / m on average. 3 , unable to meet the requirements of the industry emission standards, the reason is that the design concept of the reheating coke oven has to take into account both lean gas and rich gas heating, so that when the coke oven is heated by rich gas, the excess air at the bottom of the vertical flue The coefficient is close to 1.0, the combustion is violent, the combustion temperature is high, and a large amount of nitrogen oxides are generated in this high-temperature zone, and due to the structural limitation of the furnace body, the amount of combustion-supporting air intake at the bottom of the vertical channel cannot be effectively adjusted, and the combustion temperature cannot be lowered. The formation of nitrogen oxides cannot be suppressed. In order to ensure that the emission of coke ovens reaches the standard, the denitrification process can only be added after the oven, resulting in a significant increase in construction costs and production costs

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