Low nitrogen emission coke-oven heating system adopting rich gas heating and adjustment method thereof

Abstract

The invention relates to a low nitrogen emission coke-oven heating system adopting rich gas heating and adjustment method thereof. The coke-oven heating system comprises a small flue, a heat exchangepassage, a combustion-supporting gas passage and a combustion chamber. The heat exchange passage comprises a heat exchange passage for gas supply at the bottom of a vertical flue and a heat exchange passage for gas supply at the section of the vertical flue; a small flue connecting pipe corresponding to the heat exchange passage for gas supply at the bottom of the vertical flue is provided with agas supply hole at the bottom of the vertical flue and a gas intake flow adjustment device I, and the heat exchange passage for gas supply at the bottom of the vertical flue is communicated with the outlet of the combustion-supporting gas at the bottom of the vertical flue through the combustion-supporting gas passage; the small flue connecting pipe corresponding to the heat exchange passage for gas supply at the section of the vertical flue is provided with the gas supply hole at the section of the vertical flue and a gas intake flow adjustment device II at the section of the vertical flue, and the heat exchange passage for gas supply at the section of the vertical flue is communicated with the outlet of the combustion-supporting gas in the partition of the vertical flue through the combustion-supporting gas passage. According to the low nitrogen emission coke-oven heating system, the amount of combustion-supporting air entering the bottom, middle, and upper parts of the vertical fluecan be independently and quantitatively adjusted, and the formation of nitrogen oxides can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of combustible gas downward injection coke ovens, in particular to a low-nitrogen emission coke oven heating system heated by rich gas 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. At present, in my country's existing down-spray coke ovens, in order to control the combustion temperature in the vertical fire channel and improve the uniformity of heating in the vertical direction in the vertical fire channel, methods such as high and low lamp heads, exhaust gas circulation and sectional supply of combustion-supporting gas are adopted. The coke oven heating system adopting the above measures is as follows: Figure 1-Figure 3 As shown, the combustion-supporting gas enters...

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Problems solved by technology

[0003] 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 industry emission standards

The analysis found that the coke oven using the above heating system can only determine the distribution of the regulating bricks through theoretical calculations in the furnace body design stage, but the distribution ratio of the two parts of the gas flow cannot be quantitatively determined in actual production, so the error is relatively large; coke After the furnace is put into operation, the excess air coefficient at the bottom of the vertical flue is close to 1, the combustion is violent and the combustion temperature is high, and a large amount of nitrogen oxides are generated in this high temperature area, and the adjustment of the regulating brick cannot be realized due to the limitation of the furnace body structure As a result, the amount of combustion-supporting air at the bottom of the flue cannot be effectively adjusted, the combustion temperature cannot be reduced, and the formation of nitrogen oxides cannot be suppressed; and when the production status of the coke oven changes, it is also impossible to adjust the bottom, middle and upper parts of the flue The amount of combustion-supporting air makes it impossible to control the high-temperature zone in the vertical fire channel, and a large amount of nitrogen oxides are generated

In order to make the coke oven emission meet the standard, the denitrification process can only be added after the oven, which greatly increases the construction cost and production cost

[0004] In addition, in the above-mentioned heating system, the chute 2 adopts a Y-shaped bifurcated structure, which is complex in structure and increases the difficulty of design. The difficulty of masonry is increased, and the system resistance is increased due to the complex circulation structure, which is not conducive to the circulation of combustion-supporting air

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