Coke oven structure capable of supplying heat through incomplete oxidation and simultaneously producing hydrogen-rich reducing gas as byproduct

Abstract

The utility model relates to a coke oven structure for incomplete oxidation heat supply and byproduct hydrogen-rich reducing gas, which comprises carbonization chambers, first-stage reaction zones, first-stage reaction zones and second-stage reaction zones, the first-stage reaction zones and the second-stage reaction zones are arranged between two adjacent carbonization chambers in a staggered manner, the first-stage reaction zones are communicated with the tops of the carbonization chambers, and the second-stage reaction zones are communicated with the tops of the carbonization chambers. The first-stage reaction zone is communicated with the bottom of the second-stage reaction zone, the second-stage reaction zone is communicated with the second-stage reaction zone, the second-stage reaction zone is communicated with a high-temperature hydrogen-rich reducing gas main pipe, and the second-stage reaction zone forms a snake-shaped gas channel in a furnace top brick wall between two adjacent carbonization chambers; the coke oven has the beneficial effects that the overall carbon emission of the coking process is greatly reduced, the environmental pollution is prevented, the raw coke oven gas is greatly subjected to resource utilization, the resource utilization rate is high, the coke oven gas utilization rate is improved, the process layout is simplified, the coke oven structure is compact, the construction investment is small, and the construction cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of incomplete oxidation coke ovens, in particular to a coke oven structure for incomplete oxidation heat supply and by-product of hydrogen-rich reducing gas at the same time. Background Art

[0002] In traditional vertical heat recovery coke ovens, carbonization chambers and combustion chambers are arranged at intervals. The combustion chambers are located at both ends of the coke oven. The raw coke oven gas generated in the carbonization chamber escapes from the top and enters the combustion chamber. A sub-flue is arranged at the bottom of the combustion chamber, and a certain number of flues are arranged in the combustion chamber. The waste gas after combustion in each flue converges and enters the sub-flue at the bottom. The waste gas from each sub-flue converges and enters the main flue and then is discharged from the coke oven and goes to the flue gas waste heat recovery. Not only the civil construction cost is high, the occupied area is large, the layout of the flue gas recovery pipeline is complex, the process is complex, the cost is high, the high-temperature flue gas recovery for power generation has poor economic benefits, but also it causes great waste of hydrogen resources. Hydrogen is not fully utilized, and the obtained CO 2 is directly discharged into the atmosphere, polluting the environment. Summary of the Invention

[0003] In order to overcome the technical problems of the prior art, the utility model provides a coke oven structure for incomplete oxidation heat supply and by-product of hydrogen-rich reducing gas at the same time. Through a new design of the internal structure of the coke oven and by guiding the air flow by an external fan, the mixed gas of raw coke oven gas and oxygen undergoes a primary reaction of incomplete oxidation reaction and a secondary reaction of reduction reaction, while heating the coal dry distillation in the carbonization chamber, hydrogen-rich reducing gas is obtained, greatly reducing the overall carbon emission of the coking process, improving the utilization rate of coke oven gas. The new coke oven structure is compact, the process layout is simple, and the construction investment is small.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A coke oven structure for incomplete oxidation heat supply and by-product of hydrogen-rich reducing gas at the same time, including a carbonization chamber, a primary reaction zone, a secondary reaction zone I and a secondary reaction zone II. A plurality of carbonization chambers are longitudinally arranged in the coke oven structure. The primary reaction zone and the secondary reaction zone I are arranged in a staggered manner between two adjacent carbonization chambers. The primary reaction zone is communicated with the top of the carbonization chamber, and the primary reaction zone is communicated with the bottom of the secondary reaction zone I. The secondary reaction zone I is not communicated with the carbonization chamber; all the secondary reaction zones I between adjacent carbonization chambers are communicated with the secondary reaction zone II arranged at the top thereof. All the secondary reaction zones II are communicated with the high-temperature hydrogen-rich reducing gas main pipe. The secondary reaction zone II forms a "snake-shaped" air duct in the furnace top brick wall between two adjacent carbonization chambers. An oxygen nozzle is arranged at the top of the primary reaction zone, and the "snake-shaped" air duct bypasses the oxygen nozzle.

[0006] Further, the coke oven structure for incomplete oxidation heat supply with by - product of hydrogen - rich reducing gas further includes an oxygen pre - heater, a pressure reducing valve, a pipeline mixer, and a flow regulating valve. The oxygen pre - heater is connected to the pipeline mixer, the pipeline mixer is communicated with the flow regulating valve, the flow regulating valve is connected to the oxygen nozzle, and a pressure reducing valve is arranged between the oxygen pre - heater and the pipeline mixer.

[0007] Further, the primary reaction zones and the first sub - reaction zones of the second stage arranged at the longitudinal two ends of the coke oven structure are arranged in an orderly manner. The outermost side is set as the first sub - reaction zone of the second stage, and the primary reaction zone is arranged on the inner side towards the carbonization chamber.

[0008] Further, the second sub - reaction zones arranged at the tops of the first sub - reaction zones of the second stage at both ends of the coke oven structure are of a direct - ventilation channel structure.

[0009] Further, the oxygen nozzle is vertically arranged at the top of the primary reaction zone, and the nozzle opening faces downward.

[0010] Further, a partition wall is arranged between the carbonization chamber and the primary reaction zone, and an air channel for gas to enter is left at the top of the partition wall.

[0011] Further, a partition wall is arranged between the carbonization chamber and the first sub - reaction zone of the second stage, and the partition wall completely separates the carbonization chamber and the first sub - reaction zone of the second stage.

[0012] Further, a partition wall is arranged between the primary reaction zone and the second sub - reaction zone of the second stage, and an air channel for gas to enter is left at the bottom of the partition wall.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] 1) After the raw coke oven gas undergoes incomplete combustion, a large amount of the raw coke oven gas is converted into hydrogen and carbon monoxide, avoiding a large amount of CO 2 and water vapor from being discharged into the atmosphere, greatly reducing the overall carbon emissions of the coking process, preventing environmental pollution. The obtained hydrogen and carbon monoxide are reused, greatly realizing the resource utilization of the raw coke oven gas, with a high resource utilization rate and improving the utilization rate of coke oven gas.

[0015] 2) Through the first sub - reaction zone of the second stage and the second sub - reaction zone of the second stage, the gas flow is led out from the top, avoiding arranging the flue in the ground in the original process, simplifying the process layout, making the coke oven structure compact, with a small construction investment and saving construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a coke oven structure for incomplete oxidation heat supply with by - product of hydrogen - rich reducing gas according to the present utility model.

[0017] Figure 2 It is a top - view schematic diagram of the staggered arrangement of the primary reaction zone and the first sub - reaction zone of the second stage according to the present utility model.

[0018] Figure 3 This is a top view schematic diagram of the "snake-shaped" air duct in the second reaction zone of the present utility model.

[0019] In the figure: 1 - oxygen; 2 - oxygen preheater; 3 - pressure reducing valve; 4 - flow regulating valve; 5 - oxygen nozzle; 6 - primary reaction zone; 7 - first secondary reaction zone; 8 - second secondary reaction zone; 9 - top brick of carbonization chamber; 10 - high-temperature hydrogen-rich reducing gas; 11 - CO 2 and water vapor; 12 - pipeline mixer; 13 - carbonization chamber. Specific embodiments

[0020] The following further describes the specific embodiments of the present utility model in conjunction with the accompanying drawings:

[0021] As Figures 1 - 3 shown, the working principle of a coke oven structure that provides heat through incomplete oxidation and by-produces hydrogen-rich reducing gas is as follows: The oxygen 1 obtained from external air separation sequentially passes through the oxygen preheater 2 and the pressure reducing valve 3 and enters the pipeline mixer 12, where it is mixed with CO 2 and water vapor 11. After mixing, it enters the primary reaction zone 6 through the oxygen nozzle 5 and undergoes an incomplete oxidation reaction with the raw coke oven gas escaping from the carbonization chamber 13, releasing heat to heat the coal in the carbonization chamber 13 on the other side of the partition wall to carbonize it. At the same time, it heats the adjacent first secondary reaction zone 7 to provide the high-temperature conditions required for the second reaction. The mixed gas after the incomplete oxidation of the mixed gas of raw coke oven gas and oxygen sequentially enters the first secondary reaction zone 7 and the second secondary reaction zone 8 for reduction reactions. CO 2 and water vapor 11 produce the by-product high-temperature hydrogen-rich reducing gas 10 after the reduction reaction, reducing the emissions of CO 2 and water vapor 11, protecting the environment. The obtained hydrogen-rich reducing gas as a by-product can be directly used as a reducing agent in the field of hydrogen metallurgy in an iron and steel integrated enterprise. In an independent coking enterprise, it can be used for hydrogen extraction or as a synthesis gas to produce bulk chemical commodities.

[0022] As Figures 1 - 3As shown in the figure, a coke oven structure for incomplete oxidation heat supply and by - product of hydrogen - rich reducing gas includes an oxygen pre - heater 2, a pressure reducing valve 3, a pipeline mixer 12, a flow regulating valve 4, an oxygen nozzle 5, a carbonization chamber 13, a primary reaction zone 6, a secondary reaction zone I 7, and a secondary reaction zone II 8. The oxygen pre - heater 2 is connected to the pipeline mixer 12. The pipeline mixer 12 is communicated with the flow regulating valve 4. The flow regulating valve 4 is connected to the oxygen nozzle 5. A pressure reducing valve 3 is arranged between the oxygen pre - heater 2 and the pipeline mixer 12. Each flow regulating valve 4 between adjacent carbonization chambers 13 is connected to the inlets of a certain number of oxygen nozzles 5. The outlet of each oxygen nozzle 5 is connected to the top of the corresponding primary reaction zone 6. The primary reaction zone 6 and the secondary reaction zone I 7 are arranged between two adjacent carbonization chambers 13. The primary reaction zone 6 and the secondary reaction zone I 7 are staggered between two adjacent carbonization chambers 13, ensuring that while the primary reaction zone 6 in the middle is backed against the partition wall of the carbonization chamber 13, three sides are the partition walls of the secondary reaction zone I 7. The top side wall of the primary reaction zone 6 is connected to the top side wall of the carbonization chamber 13. The bottom of the primary reaction zone 6 is connected to the bottom of the secondary reaction zone I 7 in the same row. The secondary reaction zone II 8 is arranged at the top of the secondary reaction zone I 7. All the secondary reaction zones I 7 between adjacent carbonization chambers 13 are connected to the same secondary reaction zone II 8. All the secondary reaction zones II 8 are connected to the main pipe of high - temperature hydrogen - rich reducing gas 10. The outermost sides at both ends of the coke oven structure are the secondary reaction zone I 7, and towards the inside is the primary reaction zone 6 adjacent to the partition wall of the carbonization chamber 13. The top of the carbonization chamber 13 is separated from the adjacent secondary reaction zone I 7. The secondary reaction zone II 8 is located at the top of the secondary reaction zone I 7, and the gas flow moves horizontally. The secondary reaction zone II 8 in the carbonization chamber top brick 9 between adjacent carbonization chambers 13 is in the form of a "snake - shaped" air duct, bypassing the oxygen nozzle 5 at the top of the primary reaction zone 6 and connecting to the main pipe of high - temperature hydrogen - rich reducing gas 10. The secondary reaction zone II 8 at both ends of the coke oven structure is a straight - through air duct.

[0023] Furthermore, the primary reaction zones 6 and the secondary reaction zones I 7 arranged at both longitudinal ends of the coke oven structure are arranged in an orderly manner. The outermost side is the secondary reaction zone I 7, and towards the inside in the direction of the carbonization chamber 13 is the primary reaction zone 6.

[0024] Furthermore, the secondary reaction zone II 8 arranged at the top of the secondary reaction zone I 7 at both ends of the coke oven structure is a straight - through air duct structure.

[0025] Furthermore, the oxygen nozzle 5 is vertically arranged at the top of the primary reaction zone 6, and the nozzle opening faces downwards.

[0026] Furthermore, a partition wall is arranged between the carbonization chamber 13 and the primary reaction zone 6, and an air duct for gas entry is left at the top of the partition wall.

[0027] Furthermore, a partition wall is arranged between the carbonization chamber 13 and the secondary reaction zone I 7, and the partition wall completely separates the carbonization chamber 14 and the secondary reaction zone I 7.

[0028] Furthermore, a partition wall is provided between the primary reaction zone 6 and the secondary reaction zone 7, and an air passage for gas to enter is left at the bottom of the partition wall.

[0029] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and its concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A coke oven structure for heat supply by incomplete oxidation and by-production of hydrogen-rich reducing gas, comprising a carbonization chamber, a primary reaction zone, a secondary reaction zone 1 and a secondary reaction zone 2, wherein a plurality of carbonization chambers are arranged in the longitudinal direction of the coke oven structure, characterized in that: The primary reaction zone and the secondary reaction zone 1 are arranged alternately between the two adjacent carbonization chambers, the primary reaction zone is connected to the top of the carbonization chamber, the primary reaction zone is connected to the bottom of the secondary reaction zone 1, and the secondary reaction zone 1 is not connected to the carbonization chamber; all the secondary reaction zones 1 between the adjacent carbonization chambers are connected to the secondary reaction zone 2 arranged on the top thereof, all the secondary reaction zones 2 are connected to the high-temperature hydrogen-rich reducing gas main pipe, and the secondary reaction zones 2 form a "snake-shaped" airway in the furnace top brick wall between the two adjacent carbonization chambers, an oxygen nozzle is arranged on the top of the primary reaction zone, and the "snake-shaped" airway bypasses the oxygen nozzle.

2. A coke oven structure for heat supply by incomplete oxidation and by-production of hydrogen-rich reducing gas according to claim 1, characterized in that: The coke oven structure that provides heat through incomplete oxidation and produces hydrogen-rich reducing gas as a by-product also includes an oxygen preheater, a pressure reducing valve, a pipeline mixer, and a flow regulating valve. The oxygen preheater is connected to the pipeline mixer, the pipeline mixer is connected to the flow regulating valve, the flow regulating valve is connected to the oxygen nozzle, and a pressure reducing valve is arranged between the oxygen preheater and the pipeline mixer.

3. The coke oven structure for incomplete oxidation heat supply and by-production of hydrogen-rich reducing gas according to claim 1, characterized in that: The primary reaction zone and the secondary reaction zone 1 are arranged in order at both ends of the coke oven structure in the longitudinal direction, the outermost zone is the secondary reaction zone 1, and the primary reaction zone is arranged inwardly toward the carbonization chamber.

4. A coke oven structure for heat supply by incomplete oxidation and by-production of hydrogen-rich reducing gas according to claim 3, characterized in that: The secondary reaction zone 2 arranged on the top of the secondary reaction zone 1 at both ends of the coke oven structure is a straight airway structure.

5. The coke oven structure for providing heat by incomplete oxidation and producing hydrogen-rich reducing gas as a by-product according to claim 1, characterized in that: The oxygen nozzle is vertically arranged on the top of the primary reaction zone, with the nozzle opening facing downward.

6. The coke oven structure for providing heat by incomplete oxidation and producing hydrogen-rich reducing gas as a by-product according to claim 1, characterized in that: A partition wall is arranged between the carbonization chamber and the primary reaction zone, and an air passage for gas to enter is left on the top of the partition wall.

7. The coke oven structure for providing heat by incomplete oxidation and producing hydrogen-rich reducing gas as a by-product according to claim 1, characterized in that: A partition wall is arranged between the carbonization chamber and the first secondary reaction zone, and the partition wall completely separates the carbonization chamber and the first secondary reaction zone.

8. The coke oven structure for providing heat by incomplete oxidation and producing hydrogen-rich reducing gas as a by-product according to claim 1, characterized in that: A partition wall is arranged between the primary reaction zone and the secondary reaction zone, and an air passage for gas to enter is left at the bottom of the partition wall.

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