CN107057720B - A vertical flue structure of coke oven combustion chamber - Google Patents

Abstract

The invention relates to a vertical flue structure of a coke oven combustion chamber, wherein the coke oven combustion chamber consists of a plurality of vertical flues, each two vertical flues form a duplex vertical flue, the bottoms of the duplex vertical flues are communicated through a waste gas circulation hole, and the bottom of each vertical flue is respectively provided with a lean gas outlet and a combustion-supporting air outlet; the elevation of the lean gas outlet at the bottom of the vertical flue is different from the elevation of the combustion air outlet, and the elevation of the lean gas outlet is 50-500 mm higher than the elevation of the combustion air outlet; the elevation of the combustion-supporting air outlet is lower than the elevation of the bottom surface of the waste gas circulation hole or is consistent with the elevation of the bottom surface of the waste gas circulation hole. The invention mixes the preheated combustion-supporting air with the waste gas when the preheated combustion-supporting air enters the vertical flue to reduce the concentration of oxygen in the combustion-supporting air, and then the preheated combustion-supporting air is upwards sprayed to contact with lean gas for combustion to form mild and deep low-oxygen dilution combustion, thereby reducing the generation amount of NOx.

Description

A vertical flue structure of coke oven combustion chamber

technical field

The invention relates to the technical field of coke ovens, in particular to a vertical flue structure of a coke oven combustion chamber.

Background technique

The uppermost part of the modern coke oven body is the furnace roof, and below the furnace roof are the combustion chambers and carbonization chambers arranged alternately. The lower part of the furnace body has a regenerator and a ramp area connecting the regenerator and the combustion chamber. Each regenerator The small flue in the lower part is connected with the flue through an exchange switch. The flue is arranged in the coke oven foundation or on both sides of the foundation, and the end of the flue leads to the chimney. Therefore, the coke oven is composed of three chambers and two regions, namely carbonization chamber, combustion chamber, regenerator, chute area, furnace top area, and basic part. The combustion chamber is on both sides of the carbonization chamber and consists of multiple vertical fire channels. The regenerator is located at the lower part of the furnace body and is divided into an air regenerator and a gas regenerator.

Every two vertical fire channels in the combustion chamber form a pair of double vertical fire channels (referred to as ascending fire channels and descending fire channels) to go up the airflow and downdraft respectively. There are exhaust gas circulation holes, so that the two vertical fire channels are connected. The combustion-supporting air and gas that enter the vertical fire channel from the bottom of the self-supporting fire channel form an updraft after being diffused and burned.

With the transformation of modern production methods, coking ovens have put forward higher requirements, such as large production capacity, small heating system resistance, convenient adjustment and control, low nitrogen environmental protection, etc. At present, in order to improve the uniformity of heating in the vertical direction in the vertical flue and meet the production load requirements, the existing down-sprayed coke ovens in my country have adopted methods such as high and low lamp caps, exhaust gas circulation, and sectional supply of combustion-supporting gas, but the nitrogen oxides in the combustion process are suppressed. There is still room for improvement in terms of generation.

Contents of the invention

The present invention provides a vertical flue structure of a coke oven combustion chamber. When the preheated combustion-supporting air enters the vertical flue, it is first mixed with circulating waste gas to reduce the concentration of oxygen in the combustion-supporting air, and then it is sprayed upwards to contact with the gas for combustion, forming Mild and deep hypoxic dilution combustion, thereby reducing the amount of NOx produced.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A coke oven combustion chamber fire passage structure, the coke oven combustion chamber is composed of a plurality of fire passages, every two fire passages form a double fire passage, the bottom of the double fire passage passes through the exhaust gas circulation hole Connected, and the bottom of each fire passage is respectively equipped with a lean gas outlet and a combustion air outlet; the elevations of the lean gas outlet and the combustion air outlet at the bottom of the fire passage are inconsistent, and the elevation of the lean gas outlet is 50-500mm higher than the combustion air outlet ; The elevation of the combustion air outlet is lower than the elevation of the bottom surface of the exhaust gas circulation hole or is consistent with the elevation of the bottom surface of the exhaust gas circulation hole.

The partition wall of the double standing fire passages is provided with lean coal gas passages and/or combustion air passages, the lean coal gas passages are provided with multiple lean gas segmental outlets along the height direction to connect with the fire passages, and the combustion air passages are provided with multiple combustion air passages along the height direction. A segmented combustion-supporting air outlet is connected to the fire passage.

Compared with prior art, the beneficial effect of the present invention is:

1) Reasonably set the relative heights of the lean gas outlet, the combustion air outlet and the exhaust gas circulation hole at the bottom of the fire passage. When the preheated combustion air enters the fire passage, it is first mixed with the exhaust gas to reduce the concentration of oxygen in the combustion air, and then spray upward Combustion in contact with gas to achieve mild and deep hypoxic dilution combustion, so that the formation of NOx in the combustion process in the vertical flue can be effectively suppressed, and the purpose of reducing nitrogen oxide emissions can be achieved;

2) It is suitable for reheating coke ovens with single-stage heating or multi-stage heating.

Description of drawings

Fig. 1 is a structural schematic diagram of the vertical flue structure of the coke oven combustion chamber according to the present invention.

Fig. 2 is a sectional view of A-A in Fig. 1 .

Fig. 3 is a B-B sectional view in Fig. 1 .

In the figure: 1. Standing fire channel 2. Duplex standing fire channel partition wall 3. Exhaust gas circulation hole 4. Combustion air outlet 5. Lean gas outlet 6. Combustion air channel 7. Lean gas channel 8. Combustion air segmental outlet 9 . Lean gas segmental exit

Detailed ways

The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

As shown in Figures 1 to 3, a coke oven combustion chamber fire passage structure according to the present invention, the coke oven combustion chamber is composed of a plurality of fire passages 1, and every two fire passages 1 form a double The bottom of the double fire passage is connected through the exhaust gas circulation hole 3, and the bottom of each fire passage 1 is respectively provided with a lean gas outlet 5 and a combustion air outlet 4; the lean gas outlet 5 at the bottom of the fire passage 1 and the The elevation of the combustion air outlet 4 is inconsistent, and the elevation of the lean gas outlet 5 is 50-500 mm higher than that of the combustion air outlet 4; the elevation of the combustion air outlet 4 is lower than the elevation of the bottom surface of the exhaust gas circulation hole 3 or consistent with the elevation of the bottom surface of the exhaust gas circulation hole 3.

The partition wall 2 of the double fire passage is provided with a lean coal gas passage 7 and/or a combustion air passage 6, and the lean coal gas passage 7 is provided with a plurality of lean gas segmental outlets 9 along the height to communicate with the fire passage 1, and the combustion air passage Road 6 is provided with a plurality of combustion-supporting air subsection outlets 8 along the height to communicate with the fire passage 1 .

For a single-stage heating reheating coke oven, it is only provided with a lean gas outlet 5 and a combustion air outlet 4 at the bottom of the combustion chamber vertical flue 1; for a multi-stage heating reheating coke oven, except In addition to the lean coal gas outlet 5 and the combustion air outlet 4 at the bottom of the vertical fire passage 1, a combustion air passage 6 and/or a lean coal gas passage 7 are respectively arranged in the double vertical fire passage partition wall 2, and multiple Lean gas subsection outlet 9 and/or a plurality of combustion air subsection outlets 8, that is, lean coal gas subsection supply, combustion air subsection supply or lean coal gas and combustion air subsection supply simultaneously.

The present invention is mainly to rationally design the combustion-supporting air outlet 4 and the lean gas outlet 5 at the bottom of the vertical fire passage 1, that is, to limit the combustion-supporting air outlet 4 at the bottom of the vertical fire passage 1 to be lower than the exhaust gas circulation hole 3 or to be arranged at the same height as that of the lean gas outlet. 5 is arranged higher than the exhaust gas circulation hole 3, so that when the preheated combustion-supporting air enters the vertical fire channel 1, it is first mixed with the exhaust gas to reduce the concentration of oxygen in the combustion-supporting air, and then it is sprayed upwards and burns in contact with the gas to form a mild and deep hypoxia Dilute combustion, thereby reducing the amount of NOx produced.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (1)

1. a kind of coke oven combustion chamber flue structure, the coke oven combustion chamber are made of multiple flues, every two flue group At a duplex flue；The bottom of duplex flue is connected to by exhaust gas circulation hole, and each flue bottom sets meager coal respectively Gas outlet and combustion air exports；It is characterized in that, the mark of the poor gas outlet and combustion air exports of the flue bottom It is high inconsistent, and poor gas spout elevation is higher than 50~500mm of combustion air exports absolute altitude；Combustion air exports absolute altitude is lower than useless Gas circulation port bottom surface absolute altitude is consistent with exhaust gas circulation hole bottom surface absolute altitude；Meager coal air flue is equipped in the partition wall of the duplex flue And/or combustion air road, meager coal air flue along high to setting multiple poor gas segmentation outlet flues, combustion air road along it is high to If multiple combustion airs are segmented outlet flue.