CN107033927A - A Segmentally Heated Coke Oven Combustion Chamber Flame Passage Structure - Google Patents

Abstract

The invention relates to a vertical flame path structure of a coke oven combustion chamber for heating in a sectional manner, wherein the coke oven combustion chamber consists of a plurality of vertical flame paths, each two vertical flame paths form a duplex vertical flame path, the bottom of each vertical flame path is provided with a combustion-supporting air bottom outlet and a lean gas bottom outlet, and the partition wall of each vertical flame path is provided with a plurality of sections of combustion-supporting air outlets and a plurality of sections of lean gas outlets along the height direction; the elevation of each section of combustion-supporting air outlet in the multi-section combustion-supporting air outlets is different from the elevation of each section of lean gas outlet in the multi-section lean gas outlets, and the elevation of the last section of combustion-supporting air outlet is higher than the elevation of the last section of lean gas outlet. The invention achieves the purpose of inhibiting the generation of NOx in the combustion process of the vertical flue by limiting the high positions of the combustion air outlets and the lean gas outlets of all sections and the feeding amount of the combustion air and the gas of all sections so as to meet higher environmental protection requirements.

Description

A Segmentally Heated Coke Oven Combustion Chamber Flame Passage Structure

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 in a reheating 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 section-heated coke oven combustion chamber vertical fire path structure. By limiting the high positions of the combustion-supporting air outlets and lean gas outlets of each section and the input volume of combustion-supporting air and coal gas of each section, the vertical fire path can be suppressed. The purpose of NOx generation in the combustion process of the flue channel is to meet higher environmental protection requirements.

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

A fire channel structure of a coke oven combustion chamber with segmental heating. The coke oven combustion chamber is composed of a plurality of fire channels, and every two fire channels form a double fire channel. Bottom outlet and lean gas bottom outlet, and the vertical fireway partition wall is provided with multi-stage combustion air outlets and multi-stage lean gas outlets along the height; each stage of the multi-stage combustion air outlets and each stage of the multi-stage lean gas outlets The elevations of the gas outlets are all different, and the elevation of the last combustion air outlet is higher than that of the last lean gas outlet.

A combustion-supporting air passage and a lean gas passage are arranged in the partition wall of the fire passage. Along the height direction, the combustion-supporting air passage is connected to the fire passage through a plurality of combustion-supporting air outlets, and the lean coal gas passage is connected to the fire passage through a plurality of lean gas outlets, and Both the combustion-supporting air outlet and the lean gas outlet are inclined and narrowed passages toward the upper side of the fire passage.

The bottom outlet of the combustion-supporting air, the bottom outlet of the lean gas, the outlets of the combustion-supporting air of each section, and the outlets of the lean gas of each section are respectively provided with flow regulating devices.

The amount of gas supplied by the last section of lean gas outlet is 1% to 50% of the total amount of gas supplied, and the amount of combustion air supplied by the last section of combustion air outlet is 1% to 50% of the total amount of combustion air supplied. And ensure that the overall excess air coefficient of the updraft above the last section of the combustion air outlet is greater than 1.

The number of segments of the multi-stage combustion air outlet and the multi-stage lean gas outlet is the same or different.

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

1) The heights of the combustion-supporting air outlets and the lean gas outlets of each section in the vertical fireway are inconsistent, so as to ensure that there is always a situation in which excess combustion-supporting air reacts with low-concentration combustible gas or excessive combustible gas reacts with oxygen-poor combustion-supporting air during the combustion process, forming an immediate The combustion process of the concentration deviation in the fire channel, so as to avoid the occurrence of rapid and violent combustion of gas and combustion air;

2) Excessive combustion-supporting air or gas is fed in sections, which can reduce the temperature of exhaust gas after upstream combustion and inhibit the formation of NOx during combustion;

3) The amount of gas supplied to the last section of the lean gas outlet in the vertical fireway accounts for 1 to 50% of the total gas volume, ensuring that the overall air excess coefficient of the upward air flow at this place is less than 1, so that the residual reducing atmosphere of high-temperature exhaust gas in the vertical fireway can be restored. Generated NOx, thereby reducing the NOx concentration in the exhaust gas; the amount of combustion air supplied to the last section of the combustion air outlet is 1% to 50% of the total amount of combustion air supplied, to ensure that the overall air excess coefficient of the updraft is greater than 1, so that The residual gas in the vertical fire channel is completely combusted, and the excess combustion air can reduce the temperature of the exhaust gas and inhibit the formation of nitrogen oxides;

4) Various low-nitrogen oxide combustion methods such as rich-lean combustion, fuel staged combustion and air staged combustion are realized, so that the formation of NOx in each stage of combustion in the vertical flue can be effectively suppressed.

Description of drawings

Fig. 1 is a schematic diagram of the vertical flue structure of the coke oven combustion chamber with stage heating 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 .

Fig. 4 is a sectional view of C-C in Fig. 1 .

In the figure: 1. Fire path 2. Fire path partition wall 3. Rich gas brick gas path 4. Lean gas path 5. Lean gas bottom exit 6. Lean gas exit 7. Lean gas exit at the last section 8. Combustion air path 9. Combustion air bottom outlet 10. Combustion air outlet 11. Last combustion air outlet 12. Crossing hole 13. Exhaust gas circulation hole

detailed description

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

As shown in Fig. 1-Fig. 4, a coke oven combustion chamber vertical fire channel structure with segmental heating according to the present invention, the coke oven combustion chamber is composed of a plurality of vertical fire channels 1, and every two vertical fire channels 1 Form a double-connected fire passage, the bottom of the fire passage 1 is provided with a combustion air bottom outlet 9 and a lean gas bottom outlet 5, and the fire passage partition wall 2 is provided with multi-stage combustion air outlets and multi-stage lean gas outlets along the height direction; the multi-stage combustion The elevations of each section of the combustion air outlet 10 in the air outlet and each section of the lean gas outlet 6 in the multi-stage lean gas outlet are different, and the elevation of the last section of the combustion air outlet 11 is higher than the elevation of the last section of the lean gas outlet 7.

The combustion-supporting air passage 8 and the lean-gas passage 4 are arranged in the partition wall 2 of the standing fire passage. The outlet 6 is connected to the fire passage 1, and the combustion-supporting air outlet 10 and the lean gas outlet 6 are all inclined and narrowed passages towards the inside of the fire passage 1.

The bottom outlet 9 of the combustion air, the bottom outlet 5 of the lean gas, the combustion air outlet 10 of each section, and the lean gas outlet 6 of each section are respectively provided with a flow regulating device, and the flow regulating device or by setting an appropriate cross-sectional area of the gas outlet to control each Partial gas flow.

The amount of gas supplied by the last section of lean gas outlet 7 is 1% to 50% of the total amount of gas supplied, and the amount of combustion air supplied by the last section of combustion air outlet 11 is 1% to 50% of the total amount of combustion air supplied. %, and ensure that the overall excess air coefficient of the updraft above the last combustion air outlet is greater than 1.

The number of segments of the multi-stage combustion air outlet and the multi-stage lean gas outlet is the same or different.

According to the present invention, a coke oven combustor fire passage structure with segmental heating, the tops of the two fire passages in the double-connected fire passages are connected through the spanning hole 12, and the bottom is connected through the exhaust gas circulation hole 13; The partition wall 2 is provided with a combustion-supporting air channel 8 and a lean gas channel 4 which are isolated from each other, and a multi-stage combustion-supporting air outlet and a multi-stage lean gas outlet are respectively arranged on the vertical fire passage partition wall 2 along the height of the vertical fire channel 1; the lean gas bottom outlet 5 is arranged at the bottom of the vertical fire passage partition wall 2; the gas passage 1 of the rich gas brick is arranged on both sides of the vertical fire passage partition wall 2 without the waste gas circulation hole 13.

The positional relationship between the combustion-supporting gas outlet of each section in the vertical fire passage and the exhaust gas circulation hole and the crossing hole should meet the following conditions:

1) The last section of combustion-supporting air outlet 11 is located at the highest point of each section of combustion-supporting gas outlet 10 (close to the position of crossing hole 12), and is higher than the last section of lean gas outlet 7;

2) Lean gas outlets 6 of each section and combustion air outlets 10 of each section are respectively arranged at different heights.

When the coke oven is heated by lean gas or mixed gas, the bottom of the vertical fire passage 1 is connected with the coke oven chute, so that the combustion-supporting air is simultaneously supplied into the bottom of the vertical fire passage 1 and the combustion-supporting air passage 8 on the partition wall 2 of the vertical fire passage. Wherein part combustion-supporting air is sprayed by combustion-supporting air bottom outlet 9, and remaining combustion-supporting air is sprayed by each section combustion-supporting air outlet 10 on the fireway partition wall 2. Lean gas or mixed gas is supplied to the lean gas passage 4 on the partition wall 2 of the vertical fire passage, part of the lean gas is ejected from the bottom outlet 5 of the lean gas, and the rest of the lean gas is discharged from the lean gas passages on the partition wall 2 of the vertical fire passage. Exit 6 ejects. In the present invention, the last stage lean gas outlet 7 is always lower than the last stage combustion air outlet 11 .

The outlet gas flows of each combustion air outlet 9, 10, 11 and each lean gas outlet 5, 6, 7 are respectively controlled by a flow regulating device or by setting an appropriate outlet flow section. During the production and heating process of the coke oven, adjust the amount of gas and combustion-supporting air at each outlet in the vertical fire channel 1, so that the air excess coefficient in the combustion process always deviates from 1, and the flame generated by the upper stage of combustion can be supported by the gas or combustion-supporting sprayed from the lower stage The temperature of the air is lowered, so that the NOx in the combustion process of the vertical flue can be comprehensively controlled.

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 (5)

1. a kind of coke oven combustion chamber flue structure of heat stepwise, the coke oven combustion chamber is made up of multiple flues, and every two Individual flue constitutes a duplex flue, and flue bottom sets combustion air outlet at bottom and poor gas outlet at bottom, founds fire Road partition wall is exported along height to the outlet of multistage combustion air and multistage poor gas is set；Characterized in that, the multistage combustion air goes out The absolute altitude of the outlet of each section of combustion air and each section of poor gas outlet in the outlet of multistage poor gas in mouthful is differed, and finally The absolute altitude of one section of combustion air outlet is higher than the absolute altitude that final stage poor gas is exported.

2. the coke oven combustion chamber flue structure of a kind of heat stepwise according to claim 1, it is characterised in that described vertical Combustion air road and meager coal air flue are set in quirk partition wall, along height to combustion air road is vertical by multiple combustion air outlets Quirk, meager coal air flue is by multiple poor gas outlet flues, and combustion air outlet and poor gas outlet are to vertical Inclined upward, narrowed passage in quirk.

3. the coke oven combustion chamber flue structure of a kind of heat stepwise according to claim 1, it is characterised in that described to help Combustion air outlet at bottom, poor gas outlet at bottom, each section of combustion air outlet and each section of meager coal gas outlet set flow tune respectively Regulating device.

4. a kind of coke oven combustion chamber flue structure of heat stepwise according to claim 1, it is characterised in that it is described most The coal gas amount that latter section of poor gas outlet is fed is feeds the 1%~50% of coal gas total amount, and the outlet of final stage combustion air is supplied The combustion-supporting air quantity entered ensures above the outlet of final stage combustion air to feed the 1%~50% of combustion air total amount Ascending air overall air coefficient of excess is more than 1.

5. the coke oven combustion chamber flue structure of a kind of heat stepwise according to claim 1, it is characterised in that described many The outlet of section combustion air and the number of fragments that multistage poor gas is exported are identical or different.